동시에 업로드할 수 있는 파일의 메모리 용량을 제한하여 메모리 부족으로 인해 발생하던 크래시 해결

네트워크 호출 최적화

package.json

@@ -1,7 +1,7 @@
 {
   "name": "arkvault",
   "private": true,
-  "version": "0.6.0",
+  "version": "0.7.0",
   "type": "module",
   "scripts": {
     "dev": "vite dev",

src/lib/components/atoms/RowVirtualizer.svelte

@@ -0,0 +1,60 @@
+<script lang="ts">
+  import { createWindowVirtualizer } from "@tanstack/svelte-virtual";
+  import type { Snippet } from "svelte";
+  import type { ClassValue } from "svelte/elements";
+
+  interface Props {
+    class?: ClassValue;
+    count: number;
+    item: Snippet<[index: number]>;
+    itemHeight: (index: number) => number;
+    itemGap?: number;
+    placeholder?: Snippet;
+  }
+
+  let { class: className, count, item, itemHeight, itemGap, placeholder }: Props = $props();
+
+  let element: HTMLElement | undefined = $state();
+  let scrollMargin = $state(0);
+
+  let virtualizer = $derived(
+    createWindowVirtualizer({
+      count,
+      estimateSize: itemHeight,
+      gap: itemGap,
+      scrollMargin,
+    }),
+  );
+
+  const measureItem = (node: HTMLElement) => {
+    $effect(() => $virtualizer.measureElement(node));
+  };
+
+  $effect(() => {
+    if (!element) return;
+
+    const observer = new ResizeObserver(() => {
+      scrollMargin = Math.round(element!.getBoundingClientRect().top + window.scrollY);
+    });
+    observer.observe(element.parentElement!);
+    return () => observer.disconnect();
+  });
+</script>
+
+<div bind:this={element} class={["relative", className]}>
+  <div style:height="{$virtualizer.getTotalSize()}px">
+    {#each $virtualizer.getVirtualItems() as virtualItem (virtualItem.key)}
+      <div
+        class="absolute left-0 top-0 w-full"
+        style:transform="translateY({virtualItem.start - scrollMargin}px)"
+        data-index={virtualItem.index}
+        use:measureItem
+      >
+        {@render item(virtualItem.index)}
+      </div>
+    {/each}
+  </div>
+  {#if placeholder && $virtualizer.getVirtualItems().length === 0}
+    {@render placeholder()}
+  {/if}
+</div>

src/lib/components/atoms/buttons/FileThumbnailButton.svelte

@@ -1,42 +1,34 @@
 <script lang="ts">
-  import type { Writable } from "svelte/store";
-  import type { FileInfo } from "$lib/modules/filesystem";
+  import { browser } from "$app/environment";
+  import type { SummarizedFileInfo } from "$lib/modules/filesystem";
   import { requestFileThumbnailDownload } from "$lib/services/file";
 
   interface Props {
-    info: Writable<FileInfo | null>;
-    onclick?: (file: FileInfo) => void;
+    info: SummarizedFileInfo;
+    onclick?: (file: SummarizedFileInfo) => void;
   }
 
   let { info, onclick }: Props = $props();
 
-  let thumbnail: string | undefined = $state();
-
-  $effect(() => {
-    if ($info) {
-      requestFileThumbnailDownload($info.id, $info.dataKey)
-        .then((thumbnailUrl) => {
-          thumbnail = thumbnailUrl ?? undefined;
-        })
-        .catch(() => {
-          // TODO: Error Handling
-          thumbnail = undefined;
-        });
-    } else {
-      thumbnail = undefined;
-    }
-  });
+  let showThumbnail = $derived(
+    browser && (info.contentType.startsWith("image/") || info.contentType.startsWith("video/")),
+  );
+  let thumbnailPromise = $derived(
+    showThumbnail ? requestFileThumbnailDownload(info.id, info.dataKey?.key) : null,
+  );
 </script>
 
-{#if $info}
-  <button
-    onclick={() => onclick?.($info)}
-    class="aspect-square overflow-hidden rounded transition active:scale-95 active:brightness-90"
-  >
+<button
+  onclick={onclick && (() => setTimeout(() => onclick(info), 100))}
+  class="aspect-square overflow-hidden rounded transition active:scale-95 active:brightness-90"
+>
+  {#await thumbnailPromise}
+    <div class="h-full w-full bg-gray-100"></div>
+  {:then thumbnail}
     {#if thumbnail}
-      <img src={thumbnail} alt={$info.name} class="h-full w-full object-cover" />
+      <img src={thumbnail} alt={info.name} class="h-full w-full object-cover" />
     {:else}
       <div class="h-full w-full bg-gray-100"></div>
     {/if}
-  </button>
-{/if}
+  {/await}
+</button>

src/lib/components/atoms/index.ts

@@ -3,3 +3,4 @@ export * from "./buttons";
 export * from "./divs";
 export * from "./inputs";
 export { default as Modal } from "./Modal.svelte";
+export { default as RowVirtualizer } from "./RowVirtualizer.svelte";

src/lib/components/molecules/Categories.svelte

@@ -0,0 +1,44 @@
+<script module lang="ts">
+  import type { DataKey } from "$lib/modules/filesystem";
+
+  export interface SelectedCategory {
+    id: number;
+    dataKey?: DataKey;
+    name: string;
+  }
+</script>
+
+<script lang="ts">
+  import type { Component } from "svelte";
+  import type { SvelteHTMLElements } from "svelte/elements";
+  import { ActionEntryButton } from "$lib/components/atoms";
+  import { CategoryLabel } from "$lib/components/molecules";
+  import type { SubCategoryInfo } from "$lib/modules/filesystem";
+  import { sortEntries } from "$lib/utils";
+
+  interface Props {
+    categories: SubCategoryInfo[];
+    categoryMenuIcon?: Component<SvelteHTMLElements["svg"]>;
+    onCategoryClick: (category: SelectedCategory) => void;
+    onCategoryMenuClick?: (category: SelectedCategory) => void;
+  }
+
+  let { categories, categoryMenuIcon, onCategoryClick, onCategoryMenuClick }: Props = $props();
+
+  let categoriesWithName = $derived(sortEntries($state.snapshot(categories)));
+</script>
+
+{#if categoriesWithName.length > 0}
+  <div class="space-y-1">
+    {#each categoriesWithName as category (category.id)}
+      <ActionEntryButton
+        class="h-12"
+        onclick={() => onCategoryClick(category)}
+        actionButtonIcon={categoryMenuIcon}
+        onActionButtonClick={() => onCategoryMenuClick?.(category)}
+      >
+        <CategoryLabel name={category.name} />
+      </ActionEntryButton>
+    {/each}
+  </div>
+{/if}

src/lib/components/molecules/Categories/Categories.svelte

@@ -1,63 +0,0 @@
-<script lang="ts">
-  import { untrack, type Component } from "svelte";
-  import type { SvelteHTMLElements } from "svelte/elements";
-  import { get, type Writable } from "svelte/store";
-  import type { CategoryInfo } from "$lib/modules/filesystem";
-  import { SortBy, sortEntries } from "$lib/utils";
-  import Category from "./Category.svelte";
-  import type { SelectedCategory } from "./service";
-
-  interface Props {
-    categories: Writable<CategoryInfo | null>[];
-    categoryMenuIcon?: Component<SvelteHTMLElements["svg"]>;
-    onCategoryClick: (category: SelectedCategory) => void;
-    onCategoryMenuClick?: (category: SelectedCategory) => void;
-    sortBy?: SortBy;
-  }
-
-  let {
-    categories,
-    categoryMenuIcon,
-    onCategoryClick,
-    onCategoryMenuClick,
-    sortBy = SortBy.NAME_ASC,
-  }: Props = $props();
-
-  let categoriesWithName: { name?: string; info: Writable<CategoryInfo | null> }[] = $state([]);
-
-  $effect(() => {
-    categoriesWithName = categories.map((category) => ({
-      name: get(category)?.name,
-      info: category,
-    }));
-
-    const sort = () => {
-      sortEntries(categoriesWithName, sortBy);
-    };
-    return untrack(() => {
-      sort();
-
-      const unsubscribes = categoriesWithName.map((category) =>
-        category.info.subscribe((value) => {
-          if (category.name === value?.name) return;
-          category.name = value?.name;
-          sort();
-        }),
-      );
-      return () => unsubscribes.forEach((unsubscribe) => unsubscribe());
-    });
-  });
-</script>
-
-{#if categoriesWithName.length > 0}
-  <div class="space-y-1">
-    {#each categoriesWithName as { info }}
-      <Category
-        {info}
-        menuIcon={categoryMenuIcon}
-        onclick={onCategoryClick}
-        onMenuClick={onCategoryMenuClick}
-      />
-    {/each}
-  </div>
-{/if}

src/lib/components/molecules/Categories/Category.svelte

@@ -1,43 +0,0 @@
-<script lang="ts">
-  import type { Component } from "svelte";
-  import type { SvelteHTMLElements } from "svelte/elements";
-  import type { Writable } from "svelte/store";
-  import { ActionEntryButton } from "$lib/components/atoms";
-  import { CategoryLabel } from "$lib/components/molecules";
-  import type { CategoryInfo } from "$lib/modules/filesystem";
-  import type { SelectedCategory } from "./service";
-
-  interface Props {
-    info: Writable<CategoryInfo | null>;
-    menuIcon?: Component<SvelteHTMLElements["svg"]>;
-    onclick: (category: SelectedCategory) => void;
-    onMenuClick?: (category: SelectedCategory) => void;
-  }
-
-  let { info, menuIcon, onclick, onMenuClick }: Props = $props();
-
-  const openCategory = () => {
-    const { id, dataKey, dataKeyVersion, name } = $info as CategoryInfo;
-    if (!dataKey || !dataKeyVersion) return; // TODO: Error handling
-
-    onclick({ id, dataKey, dataKeyVersion, name });
-  };
-
-  const openMenu = () => {
-    const { id, dataKey, dataKeyVersion, name } = $info as CategoryInfo;
-    if (!dataKey || !dataKeyVersion) return; // TODO: Error handling
-
-    onMenuClick!({ id, dataKey, dataKeyVersion, name });
-  };
-</script>
-
-{#if $info}
-  <ActionEntryButton
-    class="h-12"
-    onclick={openCategory}
-    actionButtonIcon={menuIcon}
-    onActionButtonClick={openMenu}
-  >
-    <CategoryLabel name={$info.name!} />
-  </ActionEntryButton>
-{/if}

src/lib/components/molecules/Categories/index.ts

@@ -1,2 +0,0 @@
-export { default } from "./Categories.svelte";
-export * from "./service";

src/lib/components/molecules/Categories/service.ts

@@ -1,6 +0,0 @@
-export interface SelectedCategory {
-  id: number;
-  dataKey: CryptoKey;
-  dataKeyVersion: Date;
-  name: string;
-}

src/lib/components/molecules/SubCategories.svelte

@@ -1,10 +1,8 @@
 <script lang="ts">
   import type { Component } from "svelte";
   import type { ClassValue, SvelteHTMLElements } from "svelte/elements";
-  import type { Writable } from "svelte/store";
   import { Categories, IconEntryButton, type SelectedCategory } from "$lib/components/molecules";
-  import { getCategoryInfo, type CategoryInfo } from "$lib/modules/filesystem";
-  import { masterKeyStore } from "$lib/stores";
+  import type { CategoryInfo } from "$lib/modules/filesystem";
 
   import IconAddCircle from "~icons/material-symbols/add-circle";
 
@@ -27,14 +25,6 @@
     subCategoryCreatePosition = "bottom",
     subCategoryMenuIcon,
   }: Props = $props();
-
-  let subCategories: Writable<CategoryInfo | null>[] = $state([]);
-
-  $effect(() => {
-    subCategories = info.subCategoryIds.map((id) =>
-      getCategoryInfo(id, $masterKeyStore?.get(1)?.key!),
-    );
-  });
 </script>
 
 <div class={["space-y-1", className]}>
@@ -53,14 +43,12 @@
   {#if subCategoryCreatePosition === "top"}
     {@render subCategoryCreate()}
   {/if}
-  {#key info}
-    <Categories
-      categories={subCategories}
-      categoryMenuIcon={subCategoryMenuIcon}
-      onCategoryClick={onSubCategoryClick}
-      onCategoryMenuClick={onSubCategoryMenuClick}
-    />
-  {/key}
+  <Categories
+    categories={info.subCategories}
+    categoryMenuIcon={subCategoryMenuIcon}
+    onCategoryClick={onSubCategoryClick}
+    onCategoryMenuClick={onSubCategoryMenuClick}
+  />
   {#if subCategoryCreatePosition === "bottom"}
     {@render subCategoryCreate()}
   {/if}

src/lib/components/molecules/index.ts

@@ -1,7 +1,7 @@
 export * from "./ActionModal.svelte";
 export { default as ActionModal } from "./ActionModal.svelte";
-export * from "./Categories";
-export { default as Categories } from "./Categories";
+export * from "./Categories.svelte";
+export { default as Categories } from "./Categories.svelte";
 export { default as IconEntryButton } from "./IconEntryButton.svelte";
 export * from "./labels";
 export { default as SubCategories } from "./SubCategories.svelte";

src/lib/components/organisms/Category/Category.svelte

@@ -1,11 +1,9 @@
 <script lang="ts">
-  import { untrack } from "svelte";
-  import { get, type Writable } from "svelte/store";
-  import { CheckBox } from "$lib/components/atoms";
+  import { CheckBox, RowVirtualizer } from "$lib/components/atoms";
   import { SubCategories, type SelectedCategory } from "$lib/components/molecules";
-  import { getFileInfo, type FileInfo, type CategoryInfo } from "$lib/modules/filesystem";
-  import { masterKeyStore } from "$lib/stores";
-  import { SortBy, sortEntries } from "$lib/utils";
+  import { updateCategoryInfo } from "$lib/indexedDB";
+  import type { CategoryInfo } from "$lib/modules/filesystem";
+  import { sortEntries } from "$lib/utils";
   import File from "./File.svelte";
   import type { SelectedFile } from "./service";
 
@@ -13,13 +11,12 @@
 
   interface Props {
     info: CategoryInfo;
+    isFileRecursive: boolean | undefined;
     onFileClick: (file: SelectedFile) => void;
     onFileRemoveClick: (file: SelectedFile) => void;
     onSubCategoryClick: (subCategory: SelectedCategory) => void;
     onSubCategoryCreateClick: () => void;
     onSubCategoryMenuClick: (subCategory: SelectedCategory) => void;
-    sortBy?: SortBy;
-    isFileRecursive: boolean;
   }
 
   let {
@@ -29,42 +26,31 @@
     onSubCategoryClick,
     onSubCategoryCreateClick,
     onSubCategoryMenuClick,
-    sortBy = SortBy.NAME_ASC,
     isFileRecursive = $bindable(),
   }: Props = $props();
 
-  let files: { name?: string; info: Writable<FileInfo | null>; isRecursive: boolean }[] = $state(
-    [],
+  let lastCategoryId = $state<CategoryInfo["id"] | undefined>();
+  let lastIsFileRecursive = $state<boolean | undefined>();
+
+  let files = $derived(
+    sortEntries(
+      info.files
+        ?.map((file) => ({ name: file.name, details: file }))
+        .filter(({ details }) => isFileRecursive || !details.isRecursive) ?? [],
+    ),
   );
 
   $effect(() => {
-    files =
-      info.files
-        ?.filter(({ isRecursive }) => isFileRecursive || !isRecursive)
-        .map(({ id, isRecursive }) => {
-          const info = getFileInfo(id, $masterKeyStore?.get(1)?.key!);
-          return {
-            name: get(info)?.name,
-            info,
-            isRecursive,
-          };
-        }) ?? [];
+    if (info.id === "root" || isFileRecursive === undefined) return;
+    if (lastCategoryId !== info.id) {
+      lastCategoryId = info.id;
+      lastIsFileRecursive = isFileRecursive;
+      return;
+    }
+    if (lastIsFileRecursive === isFileRecursive) return;
 
-    const sort = () => {
-      sortEntries(files, sortBy);
-    };
-    return untrack(() => {
-      sort();
-
-      const unsubscribes = files.map((file) =>
-        file.info.subscribe((value) => {
-          if (file.name === value?.name) return;
-          file.name = value?.name;
-          sort();
-        }),
-      );
-      return () => unsubscribes.forEach((unsubscribe) => unsubscribe());
-    });
+    lastIsFileRecursive = isFileRecursive;
+    void updateCategoryInfo(info.id, { isFileRecursive });
   });
 </script>
 
@@ -89,19 +75,19 @@
           <p class="font-medium">하위 카테고리의 파일</p>
         </CheckBox>
       </div>
-      <div class="space-y-1">
-        {#key info}
-          {#each files as { info, isRecursive }}
-            <File
-              {info}
-              onclick={onFileClick}
-              onRemoveClick={!isRecursive ? onFileRemoveClick : undefined}
-            />
-          {:else}
-            <p class="text-gray-500 text-center">이 카테고리에 추가된 파일이 없어요.</p>
-          {/each}
-        {/key}
-      </div>
+      <RowVirtualizer count={files.length} itemHeight={() => 48} itemGap={4}>
+        {#snippet item(index)}
+          {@const { details } = files[index]!}
+          <File
+            info={details}
+            onclick={onFileClick}
+            onRemoveClick={!details.isRecursive ? onFileRemoveClick : undefined}
+          />
+        {/snippet}
+        {#snippet placeholder()}
+          <p class="text-center text-gray-500">이 카테고리에 추가된 파일이 없어요.</p>
+        {/snippet}
+      </RowVirtualizer>
     </div>
   {/if}
 </div>

src/lib/components/organisms/Category/File.svelte

@@ -1,59 +1,38 @@
 <script lang="ts">
-  import type { Writable } from "svelte/store";
+  import { browser } from "$app/environment";
   import { ActionEntryButton } from "$lib/components/atoms";
   import { DirectoryEntryLabel } from "$lib/components/molecules";
-  import type { FileInfo } from "$lib/modules/filesystem";
-  import { requestFileThumbnailDownload, type SelectedFile } from "./service";
+  import type { CategoryFileInfo } from "$lib/modules/filesystem";
+  import { requestFileThumbnailDownload } from "$lib/services/file";
+  import type { SelectedFile } from "./service";
 
   import IconClose from "~icons/material-symbols/close";
 
   interface Props {
-    info: Writable<FileInfo | null>;
-    onclick: (selectedFile: SelectedFile) => void;
-    onRemoveClick?: (selectedFile: SelectedFile) => void;
+    info: CategoryFileInfo;
+    onclick: (file: SelectedFile) => void;
+    onRemoveClick?: (file: SelectedFile) => void;
   }
 
   let { info, onclick, onRemoveClick }: Props = $props();
 
-  let thumbnail: string | undefined = $state();
-
-  const openFile = () => {
-    const { id, dataKey, dataKeyVersion, name } = $info as FileInfo;
-    if (!dataKey || !dataKeyVersion) return; // TODO: Error handling
-
-    onclick({ id, dataKey, dataKeyVersion, name });
-  };
-
-  const removeFile = () => {
-    const { id, dataKey, dataKeyVersion, name } = $info as FileInfo;
-    if (!dataKey || !dataKeyVersion) return; // TODO: Error handling
-
-    onRemoveClick!({ id, dataKey, dataKeyVersion, name });
-  };
-
-  $effect(() => {
-    if ($info) {
-      requestFileThumbnailDownload($info.id, $info.dataKey)
-        .then((thumbnailUrl) => {
-          thumbnail = thumbnailUrl ?? undefined;
-        })
-        .catch(() => {
-          // TODO: Error Handling
-          thumbnail = undefined;
-        });
-    } else {
-      thumbnail = undefined;
-    }
-  });
+  let showThumbnail = $derived(
+    browser && (info.contentType.startsWith("image/") || info.contentType.startsWith("video/")),
+  );
+  let thumbnailPromise = $derived(
+    showThumbnail ? requestFileThumbnailDownload(info.id, info.dataKey?.key) : null,
+  );
 </script>
 
-{#if $info}
-  <ActionEntryButton
-    class="h-12"
-    onclick={openFile}
-    actionButtonIcon={onRemoveClick && IconClose}
-    onActionButtonClick={removeFile}
-  >
-    <DirectoryEntryLabel type="file" {thumbnail} name={$info.name} />
-  </ActionEntryButton>
-{/if}
+<ActionEntryButton
+  class="h-12"
+  onclick={() => onclick(info)}
+  actionButtonIcon={onRemoveClick && IconClose}
+  onActionButtonClick={() => onRemoveClick?.(info)}
+>
+  {#await thumbnailPromise}
+    <DirectoryEntryLabel type="file" name={info.name} />
+  {:then thumbnail}
+    <DirectoryEntryLabel type="file" thumbnail={thumbnail ?? undefined} name={info.name} />
+  {/await}
+</ActionEntryButton>

src/lib/components/organisms/Category/service.ts

@@ -1,8 +1,4 @@
-export { requestFileThumbnailDownload } from "$lib/services/file";
-
 export interface SelectedFile {
   id: number;
-  dataKey: CryptoKey;
-  dataKeyVersion: Date;
   name: string;
 }

src/lib/components/organisms/Gallery.svelte

@@ -1,148 +1,78 @@
 <script lang="ts">
-  import { createWindowVirtualizer } from "@tanstack/svelte-virtual";
-  import { untrack } from "svelte";
-  import { get, type Writable } from "svelte/store";
-  import { FileThumbnailButton } from "$lib/components/atoms";
-  import type { FileInfo } from "$lib/modules/filesystem";
+  import { FileThumbnailButton, RowVirtualizer } from "$lib/components/atoms";
+  import type { SummarizedFileInfo } from "$lib/modules/filesystem";
   import { formatDate, formatDateSortable, SortBy, sortEntries } from "$lib/utils";
 
   interface Props {
-    files: Writable<FileInfo | null>[];
-    onFileClick?: (file: FileInfo) => void;
+    files: SummarizedFileInfo[];
+    onFileClick?: (file: SummarizedFileInfo) => void;
   }
 
   let { files, onFileClick }: Props = $props();
 
-  type FileEntry =
-    | { date?: undefined; contentType?: undefined; info: Writable<FileInfo | null> }
-    | { date: Date; contentType: string; info: Writable<FileInfo | null> };
   type Row =
-    | { type: "header"; key: string; label: string }
-    | { type: "items"; key: string; items: FileEntry[] };
+    | { type: "header"; label: string }
+    | { type: "items"; files: SummarizedFileInfo[]; isLast: boolean };
 
-  let filesWithDate: FileEntry[] = $state([]);
-  let rows: Row[] = $state([]);
-  let listElement: HTMLDivElement | undefined = $state();
+  let rows = $derived.by(() => {
+    const groups = Map.groupBy(
+      files.filter(
+        (file) => file.contentType.startsWith("image/") || file.contentType.startsWith("video/"),
+      ),
+      (file) => formatDateSortable(file.createdAt ?? file.lastModifiedAt),
+    );
+    return Array.from(groups.entries())
+      .sort(([dateA], [dateB]) => dateB.localeCompare(dateA))
+      .flatMap(([_, entries]) => {
+        const sortedEntries = [...entries];
+        sortEntries(sortedEntries, SortBy.DATE_DESC);
 
-  const virtualizer = createWindowVirtualizer({
-    count: 0,
-    getItemKey: (index) => rows[index]!.key,
-    estimateSize: () => 1000, // TODO
-  });
-
-  const measureRow = (node: HTMLElement) => {
-    $virtualizer.measureElement(node);
-    return {
-      update: () => $virtualizer.measureElement(node),
-    };
-  };
-
-  $effect(() => {
-    filesWithDate = files.map((file) => {
-      const info = get(file);
-      if (info) {
-        return {
-          date: info.createdAt ?? info.lastModifiedAt,
-          contentType: info.contentType,
-          info: file,
-        };
-      } else {
-        return { info: file };
-      }
-    });
-
-    const buildRows = () => {
-      const map = new Map<string, FileEntry[]>();
-
-      for (const file of filesWithDate) {
-        if (
-          !file.date ||
-          !(file.contentType.startsWith("image/") || file.contentType.startsWith("video/"))
-        ) {
-          continue;
-        }
-
-        const date = formatDateSortable(file.date);
-        const entries = map.get(date) ?? [];
-        entries.push(file);
-        map.set(date, entries);
-      }
-
-      const newRows: Row[] = [];
-      const sortedDates = Array.from(map.keys()).sort((a, b) => b.localeCompare(a));
-      for (const date of sortedDates) {
-        const entries = map.get(date)!;
-        sortEntries(entries, SortBy.DATE_DESC);
-
-        newRows.push({
-          type: "header",
-          key: `header-${date}`,
-          label: formatDate(entries[0]!.date!),
-        });
-        newRows.push({
-          type: "items",
-          key: `items-${date}`,
-          items: entries,
-        });
-      }
-
-      rows = newRows;
-      $virtualizer.setOptions({ count: rows.length });
-    };
-    return untrack(() => {
-      buildRows();
-
-      const unsubscribes = filesWithDate.map((file) =>
-        file.info.subscribe((value) => {
-          const newDate = value?.createdAt ?? value?.lastModifiedAt;
-          const newContentType = value?.contentType;
-          if (file.date?.getTime() === newDate?.getTime() && file.contentType === newContentType) {
-            return;
-          }
-
-          file.date = newDate;
-          file.contentType = newContentType;
-          buildRows();
-        }),
-      );
-      return () => unsubscribes.forEach((unsubscribe) => unsubscribe());
-    });
+        return [
+          {
+            type: "header",
+            label: formatDate(sortedEntries[0]!.createdAt ?? sortedEntries[0]!.lastModifiedAt),
+          },
+          ...Array.from({ length: Math.ceil(sortedEntries.length / 4) }, (_, i) => {
+            const start = i * 4;
+            const end = start + 4;
+            return {
+              type: "items" as const,
+              files: sortedEntries.slice(start, end),
+              isLast: end >= sortedEntries.length,
+            };
+          }),
+        ] satisfies Row[];
+      });
   });
 </script>
 
-<div bind:this={listElement} class="relative flex flex-grow flex-col">
-  <div style="height: {$virtualizer.getTotalSize()}px;">
-    {#each $virtualizer.getVirtualItems() as virtualRow (virtualRow.key)}
-      {@const row = rows[virtualRow.index]!}
-      <div
-        use:measureRow
-        data-index={virtualRow.index}
-        class="absolute left-0 top-0 w-full"
-        style="transform: translateY({virtualRow.start}px);"
-      >
-        {#if row.type === "header"}
-          <p class="pb-2 font-medium">{row.label}</p>
-        {:else}
-          <div class="grid grid-cols-4 gap-1 pb-4">
-            {#each row.items as { info }}
-              <FileThumbnailButton {info} onclick={onFileClick} />
-            {/each}
-          </div>
-        {/if}
+<RowVirtualizer
+  count={rows.length}
+  itemHeight={(index) =>
+    rows[index]!.type === "header" ? 28 : 181 + (rows[index]!.isLast ? 16 : 4)}
+  class="flex flex-grow flex-col"
+>
+  {#snippet item(index)}
+    {@const row = rows[index]!}
+    {#if row.type === "header"}
+      <p class="pb-2 text-sm font-medium">{row.label}</p>
+    {:else}
+      <div class={["grid grid-cols-4 gap-x-1", row.isLast ? "pb-4" : "pb-1"]}>
+        {#each row.files as file (file.id)}
+          <FileThumbnailButton info={file} onclick={onFileClick} />
+        {/each}
       </div>
-    {/each}
-  </div>
-  {#if $virtualizer.getVirtualItems().length === 0}
+    {/if}
+  {/snippet}
+  {#snippet placeholder()}
     <div class="flex h-full flex-grow items-center justify-center">
       <p class="text-gray-500">
         {#if files.length === 0}
           업로드된 파일이 없어요.
-        {:else if filesWithDate.length === 0}
-          파일 목록을 불러오고 있어요.
         {:else}
           사진 또는 동영상이 없어요.
         {/if}
       </p>
     </div>
-  {/if}
-</div>
+  {/snippet}
+</RowVirtualizer>

src/lib/indexedDB/filesystem.ts

@@ -1,7 +1,5 @@
 import { Dexie, type EntityTable } from "dexie";
 
-export type DirectoryId = "root" | number;
-
 interface DirectoryInfo {
   id: number;
   parentId: DirectoryId;
@@ -18,8 +16,6 @@ interface FileInfo {
   categoryIds: number[];
 }
 
-export type CategoryId = "root" | number;
-
 interface CategoryInfo {
   id: number;
   parentId: CategoryId;
@@ -78,6 +74,10 @@ export const getFileInfo = async (id: number) => {
   return await filesystem.file.get(id);
 };
 
+export const bulkGetFileInfos = async (ids: number[]) => {
+  return await filesystem.file.bulkGet(ids);
+};
+
 export const storeFileInfo = async (fileInfo: FileInfo) => {
   await filesystem.file.put(fileInfo);
 };

src/lib/modules/file/download.svelte.ts

@@ -0,0 +1,95 @@
+import axios from "axios";
+import { limitFunction } from "p-limit";
+import { decryptData } from "$lib/modules/crypto";
+
+export interface FileDownloadState {
+  id: number;
+  status:
+    | "download-pending"
+    | "downloading"
+    | "decryption-pending"
+    | "decrypting"
+    | "decrypted"
+    | "canceled"
+    | "error";
+  progress?: number;
+  rate?: number;
+  estimated?: number;
+  result?: ArrayBuffer;
+}
+
+type LiveFileDownloadState = FileDownloadState & {
+  status: "download-pending" | "downloading" | "decryption-pending" | "decrypting";
+};
+
+let downloadingFiles: FileDownloadState[] = $state([]);
+
+export const isFileDownloading = (
+  status: FileDownloadState["status"],
+): status is LiveFileDownloadState["status"] =>
+  ["download-pending", "downloading", "decryption-pending", "decrypting"].includes(status);
+
+export const getFileDownloadState = (fileId: number) => {
+  return downloadingFiles.find((file) => file.id === fileId && isFileDownloading(file.status));
+};
+
+export const getDownloadingFiles = () => {
+  return downloadingFiles.filter((file) => isFileDownloading(file.status));
+};
+
+export const clearDownloadedFiles = () => {
+  downloadingFiles = downloadingFiles.filter((file) => isFileDownloading(file.status));
+};
+
+const requestFileDownload = limitFunction(
+  async (state: FileDownloadState, id: number) => {
+    state.status = "downloading";
+
+    const res = await axios.get(`/api/file/${id}/download`, {
+      responseType: "arraybuffer",
+      onDownloadProgress: ({ progress, rate, estimated }) => {
+        state.progress = progress;
+        state.rate = rate;
+        state.estimated = estimated;
+      },
+    });
+    const fileEncrypted: ArrayBuffer = res.data;
+
+    state.status = "decryption-pending";
+    return fileEncrypted;
+  },
+  { concurrency: 1 },
+);
+
+const decryptFile = limitFunction(
+  async (
+    state: FileDownloadState,
+    fileEncrypted: ArrayBuffer,
+    fileEncryptedIv: string,
+    dataKey: CryptoKey,
+  ) => {
+    state.status = "decrypting";
+
+    const fileBuffer = await decryptData(fileEncrypted, fileEncryptedIv, dataKey);
+
+    state.status = "decrypted";
+    state.result = fileBuffer;
+    return fileBuffer;
+  },
+  { concurrency: 4 },
+);
+
+export const downloadFile = async (id: number, fileEncryptedIv: string, dataKey: CryptoKey) => {
+  downloadingFiles.push({
+    id,
+    status: "download-pending",
+  });
+  const state = downloadingFiles.at(-1)!;
+
+  try {
+    return await decryptFile(state, await requestFileDownload(state, id), fileEncryptedIv, dataKey);
+  } catch (e) {
+    state.status = "error";
+    throw e;
+  }
+};

src/lib/modules/file/download.ts

@@ -1,84 +0,0 @@
-import axios from "axios";
-import { limitFunction } from "p-limit";
-import { writable, type Writable } from "svelte/store";
-import { decryptData } from "$lib/modules/crypto";
-import { fileDownloadStatusStore, type FileDownloadStatus } from "$lib/stores";
-
-const requestFileDownload = limitFunction(
-  async (status: Writable<FileDownloadStatus>, id: number) => {
-    status.update((value) => {
-      value.status = "downloading";
-      return value;
-    });
-
-    const res = await axios.get(`/api/file/${id}/download`, {
-      responseType: "arraybuffer",
-      onDownloadProgress: ({ progress, rate, estimated }) => {
-        status.update((value) => {
-          value.progress = progress;
-          value.rate = rate;
-          value.estimated = estimated;
-          return value;
-        });
-      },
-    });
-    const fileEncrypted: ArrayBuffer = res.data;
-
-    status.update((value) => {
-      value.status = "decryption-pending";
-      return value;
-    });
-    return fileEncrypted;
-  },
-  { concurrency: 1 },
-);
-
-const decryptFile = limitFunction(
-  async (
-    status: Writable<FileDownloadStatus>,
-    fileEncrypted: ArrayBuffer,
-    fileEncryptedIv: string,
-    dataKey: CryptoKey,
-  ) => {
-    status.update((value) => {
-      value.status = "decrypting";
-      return value;
-    });
-
-    const fileBuffer = await decryptData(fileEncrypted, fileEncryptedIv, dataKey);
-
-    status.update((value) => {
-      value.status = "decrypted";
-      value.result = fileBuffer;
-      return value;
-    });
-    return fileBuffer;
-  },
-  { concurrency: 4 },
-);
-
-export const downloadFile = async (id: number, fileEncryptedIv: string, dataKey: CryptoKey) => {
-  const status = writable<FileDownloadStatus>({
-    id,
-    status: "download-pending",
-  });
-  fileDownloadStatusStore.update((value) => {
-    value.push(status);
-    return value;
-  });
-
-  try {
-    return await decryptFile(
-      status,
-      await requestFileDownload(status, id),
-      fileEncryptedIv,
-      dataKey,
-    );
-  } catch (e) {
-    status.update((value) => {
-      value.status = "error";
-      return value;
-    });
-    throw e;
-  }
-};

src/lib/modules/file/index.ts

@@ -1,3 +1,3 @@
 export * from "./cache";
-export * from "./download";
-export * from "./upload";
+export * from "./download.svelte";
+export * from "./upload.svelte";

src/lib/modules/file/upload.svelte.ts

@@ -1,7 +1,6 @@
 import axios from "axios";
 import ExifReader from "exifreader";
 import { limitFunction } from "p-limit";
-import { writable, type Writable } from "svelte/store";
 import {
   encodeToBase64,
   generateDataKey,
@@ -11,20 +10,56 @@ import {
   digestMessage,
   signMessageHmac,
 } from "$lib/modules/crypto";
+import { Scheduler } from "$lib/modules/scheduler";
 import { generateThumbnail } from "$lib/modules/thumbnail";
 import type {
   FileThumbnailUploadRequest,
   FileUploadRequest,
   FileUploadResponse,
 } from "$lib/server/schemas";
-import {
-  fileUploadStatusStore,
-  type MasterKey,
-  type HmacSecret,
-  type FileUploadStatus,
-} from "$lib/stores";
+import type { MasterKey, HmacSecret } from "$lib/stores";
 import { trpc } from "$trpc/client";
 
+export interface FileUploadState {
+  name: string;
+  parentId: DirectoryId;
+  status:
+    | "queued"
+    | "encryption-pending"
+    | "encrypting"
+    | "upload-pending"
+    | "uploading"
+    | "uploaded"
+    | "canceled"
+    | "error";
+  progress?: number;
+  rate?: number;
+  estimated?: number;
+}
+
+export type LiveFileUploadState = FileUploadState & {
+  status: "queued" | "encryption-pending" | "encrypting" | "upload-pending" | "uploading";
+};
+
+const scheduler = new Scheduler<
+  { fileId: number; fileBuffer: ArrayBuffer; thumbnailBuffer?: ArrayBuffer } | undefined
+>();
+let uploadingFiles: FileUploadState[] = $state([]);
+
+const isFileUploading = (status: FileUploadState["status"]) =>
+  ["queued", "encryption-pending", "encrypting", "upload-pending", "uploading"].includes(status);
+
+export const getUploadingFiles = (parentId?: DirectoryId) => {
+  return uploadingFiles.filter(
+    (file) =>
+      (parentId === undefined || file.parentId === parentId) && isFileUploading(file.status),
+  );
+};
+
+export const clearUploadedFiles = () => {
+  uploadingFiles = uploadingFiles.filter((file) => isFileUploading(file.status));
+};
+
 const requestDuplicateFileScan = limitFunction(
   async (file: File, hmacSecret: HmacSecret, onDuplicate: () => Promise<boolean>) => {
     const fileBuffer = await file.arrayBuffer();
@@ -76,16 +111,8 @@ const extractExifDateTime = (fileBuffer: ArrayBuffer) => {
 };
 
 const encryptFile = limitFunction(
-  async (
-    status: Writable<FileUploadStatus>,
-    file: File,
-    fileBuffer: ArrayBuffer,
-    masterKey: MasterKey,
-  ) => {
-    status.update((value) => {
-      value.status = "encrypting";
-      return value;
-    });
+  async (state: FileUploadState, file: File, fileBuffer: ArrayBuffer, masterKey: MasterKey) => {
+    state.status = "encrypting";
 
     const fileType = getFileType(file);
 
@@ -109,10 +136,7 @@ const encryptFile = limitFunction(
     const thumbnailBuffer = await thumbnail?.arrayBuffer();
     const thumbnailEncrypted = thumbnailBuffer && (await encryptData(thumbnailBuffer, dataKey));
 
-    status.update((value) => {
-      value.status = "upload-pending";
-      return value;
-    });
+    state.status = "upload-pending";
 
     return {
       dataKeyWrapped,
@@ -130,20 +154,14 @@ const encryptFile = limitFunction(
 );
 
 const requestFileUpload = limitFunction(
-  async (status: Writable<FileUploadStatus>, form: FormData, thumbnailForm: FormData | null) => {
-    status.update((value) => {
-      value.status = "uploading";
-      return value;
-    });
+  async (state: FileUploadState, form: FormData, thumbnailForm: FormData | null) => {
+    state.status = "uploading";
 
     const res = await axios.post("/api/file/upload", form, {
       onUploadProgress: ({ progress, rate, estimated }) => {
-        status.update((value) => {
-          value.progress = progress;
-          value.rate = rate;
-          value.estimated = estimated;
-          return value;
-        });
+        state.progress = progress;
+        state.rate = rate;
+        state.estimated = estimated;
       },
     });
     const { file }: FileUploadResponse = res.data;
@@ -157,10 +175,7 @@ const requestFileUpload = limitFunction(
       }
     }
 
-    status.update((value) => {
-      value.status = "uploaded";
-      return value;
-    });
+    state.status = "uploaded";
 
     return { fileId: file };
   },
@@ -173,92 +188,85 @@ export const uploadFile = async (
   hmacSecret: HmacSecret,
   masterKey: MasterKey,
   onDuplicate: () => Promise<boolean>,
-): Promise<
-  { fileId: number; fileBuffer: ArrayBuffer; thumbnailBuffer?: ArrayBuffer } | undefined
-> => {
-  const status = writable<FileUploadStatus>({
+) => {
+  uploadingFiles.push({
     name: file.name,
     parentId,
-    status: "encryption-pending",
-  });
-  fileUploadStatusStore.update((value) => {
-    value.push(status);
-    return value;
+    status: "queued",
   });
+  const state = uploadingFiles.at(-1)!;
 
-  try {
-    const { fileBuffer, fileSigned } = await requestDuplicateFileScan(
-      file,
-      hmacSecret,
-      onDuplicate,
-    );
-    if (!fileBuffer || !fileSigned) {
-      status.update((value) => {
-        value.status = "canceled";
-        return value;
-      });
-      fileUploadStatusStore.update((value) => {
-        value = value.filter((v) => v !== status);
-        return value;
-      });
-      return undefined;
-    }
+  return await scheduler.schedule(
+    async () => file.size,
+    async () => {
+      state.status = "encryption-pending";
 
-    const {
-      dataKeyWrapped,
-      dataKeyVersion,
-      fileType,
-      fileEncrypted,
-      fileEncryptedHash,
-      nameEncrypted,
-      createdAtEncrypted,
-      lastModifiedAtEncrypted,
-      thumbnail,
-    } = await encryptFile(status, file, fileBuffer, masterKey);
+      try {
+        const { fileBuffer, fileSigned } = await requestDuplicateFileScan(
+          file,
+          hmacSecret,
+          onDuplicate,
+        );
+        if (!fileBuffer || !fileSigned) {
+          state.status = "canceled";
+          uploadingFiles = uploadingFiles.filter((file) => file !== state);
+          return undefined;
+        }
 
-    const form = new FormData();
-    form.set(
-      "metadata",
-      JSON.stringify({
-        parent: parentId,
-        mekVersion: masterKey.version,
-        dek: dataKeyWrapped,
-        dekVersion: dataKeyVersion.toISOString(),
-        hskVersion: hmacSecret.version,
-        contentHmac: fileSigned,
-        contentType: fileType,
-        contentIv: fileEncrypted.iv,
-        name: nameEncrypted.ciphertext,
-        nameIv: nameEncrypted.iv,
-        createdAt: createdAtEncrypted?.ciphertext,
-        createdAtIv: createdAtEncrypted?.iv,
-        lastModifiedAt: lastModifiedAtEncrypted.ciphertext,
-        lastModifiedAtIv: lastModifiedAtEncrypted.iv,
-      } satisfies FileUploadRequest),
-    );
-    form.set("content", new Blob([fileEncrypted.ciphertext]));
-    form.set("checksum", fileEncryptedHash);
+        const {
+          dataKeyWrapped,
+          dataKeyVersion,
+          fileType,
+          fileEncrypted,
+          fileEncryptedHash,
+          nameEncrypted,
+          createdAtEncrypted,
+          lastModifiedAtEncrypted,
+          thumbnail,
+        } = await encryptFile(state, file, fileBuffer, masterKey);
 
-    let thumbnailForm = null;
-    if (thumbnail) {
-      thumbnailForm = new FormData();
-      thumbnailForm.set(
-        "metadata",
-        JSON.stringify({
-          dekVersion: dataKeyVersion.toISOString(),
-          contentIv: thumbnail.iv,
-        } satisfies FileThumbnailUploadRequest),
-      );
-      thumbnailForm.set("content", new Blob([thumbnail.ciphertext]));
-    }
+        const form = new FormData();
+        form.set(
+          "metadata",
+          JSON.stringify({
+            parent: parentId,
+            mekVersion: masterKey.version,
+            dek: dataKeyWrapped,
+            dekVersion: dataKeyVersion.toISOString(),
+            hskVersion: hmacSecret.version,
+            contentHmac: fileSigned,
+            contentType: fileType,
+            contentIv: fileEncrypted.iv,
+            name: nameEncrypted.ciphertext,
+            nameIv: nameEncrypted.iv,
+            createdAt: createdAtEncrypted?.ciphertext,
+            createdAtIv: createdAtEncrypted?.iv,
+            lastModifiedAt: lastModifiedAtEncrypted.ciphertext,
+            lastModifiedAtIv: lastModifiedAtEncrypted.iv,
+          } satisfies FileUploadRequest),
+        );
+        form.set("content", new Blob([fileEncrypted.ciphertext]));
+        form.set("checksum", fileEncryptedHash);
 
-    const { fileId } = await requestFileUpload(status, form, thumbnailForm);
-    return { fileId, fileBuffer, thumbnailBuffer: thumbnail?.plaintext };
-  } catch (e) {
-    status.update((value) => {
-      value.status = "error";
-      return value;
-    });
-    throw e;
-  }
+        let thumbnailForm = null;
+        if (thumbnail) {
+          thumbnailForm = new FormData();
+          thumbnailForm.set(
+            "metadata",
+            JSON.stringify({
+              dekVersion: dataKeyVersion.toISOString(),
+              contentIv: thumbnail.iv,
+            } satisfies FileThumbnailUploadRequest),
+          );
+          thumbnailForm.set("content", new Blob([thumbnail.ciphertext]));
+        }
+
+        const { fileId } = await requestFileUpload(state, form, thumbnailForm);
+        return { fileId, fileBuffer, thumbnailBuffer: thumbnail?.plaintext };
+      } catch (e) {
+        state.status = "error";
+        throw e;
+      }
+    },
+  );
 };

src/lib/modules/filesystem.ts

@@ -1,370 +0,0 @@
-import { TRPCClientError } from "@trpc/client";
-import { get, writable, type Writable } from "svelte/store";
-import {
-  getDirectoryInfos as getDirectoryInfosFromIndexedDB,
-  getDirectoryInfo as getDirectoryInfoFromIndexedDB,
-  storeDirectoryInfo,
-  deleteDirectoryInfo,
-  getFileInfos as getFileInfosFromIndexedDB,
-  getFileInfo as getFileInfoFromIndexedDB,
-  storeFileInfo,
-  deleteFileInfo,
-  getCategoryInfos as getCategoryInfosFromIndexedDB,
-  getCategoryInfo as getCategoryInfoFromIndexedDB,
-  storeCategoryInfo,
-  updateCategoryInfo as updateCategoryInfoInIndexedDB,
-  deleteCategoryInfo,
-  type DirectoryId,
-  type CategoryId,
-} from "$lib/indexedDB";
-import { unwrapDataKey, decryptString } from "$lib/modules/crypto";
-import { trpc } from "$trpc/client";
-
-export type DirectoryInfo =
-  | {
-      id: "root";
-      parentId?: undefined;
-      dataKey?: undefined;
-      dataKeyVersion?: undefined;
-      name?: undefined;
-      subDirectoryIds: number[];
-      fileIds: number[];
-    }
-  | {
-      id: number;
-      parentId: DirectoryId;
-      dataKey?: CryptoKey;
-      dataKeyVersion?: Date;
-      name: string;
-      subDirectoryIds: number[];
-      fileIds: number[];
-    };
-
-export interface FileInfo {
-  id: number;
-  parentId: DirectoryId;
-  dataKey?: CryptoKey;
-  dataKeyVersion?: Date;
-  contentType: string;
-  contentIv?: string;
-  name: string;
-  createdAt?: Date;
-  lastModifiedAt: Date;
-  categoryIds: number[];
-}
-
-export type CategoryInfo =
-  | {
-      id: "root";
-      dataKey?: undefined;
-      dataKeyVersion?: undefined;
-      name?: undefined;
-      subCategoryIds: number[];
-      files?: undefined;
-      isFileRecursive?: undefined;
-    }
-  | {
-      id: number;
-      dataKey?: CryptoKey;
-      dataKeyVersion?: Date;
-      name: string;
-      subCategoryIds: number[];
-      files: { id: number; isRecursive: boolean }[];
-      isFileRecursive: boolean;
-    };
-
-const directoryInfoStore = new Map<DirectoryId, Writable<DirectoryInfo | null>>();
-const fileInfoStore = new Map<number, Writable<FileInfo | null>>();
-const categoryInfoStore = new Map<CategoryId, Writable<CategoryInfo | null>>();
-
-const fetchDirectoryInfoFromIndexedDB = async (
-  id: DirectoryId,
-  info: Writable<DirectoryInfo | null>,
-) => {
-  if (get(info)) return;
-
-  const [directory, subDirectories, files] = await Promise.all([
-    id !== "root" ? getDirectoryInfoFromIndexedDB(id) : undefined,
-    getDirectoryInfosFromIndexedDB(id),
-    getFileInfosFromIndexedDB(id),
-  ]);
-  const subDirectoryIds = subDirectories.map(({ id }) => id);
-  const fileIds = files.map(({ id }) => id);
-
-  if (id === "root") {
-    info.set({ id, subDirectoryIds, fileIds });
-  } else {
-    if (!directory) return;
-    info.set({
-      id,
-      parentId: directory.parentId,
-      name: directory.name,
-      subDirectoryIds,
-      fileIds,
-    });
-  }
-};
-
-const fetchDirectoryInfoFromServer = async (
-  id: DirectoryId,
-  info: Writable<DirectoryInfo | null>,
-  masterKey: CryptoKey,
-) => {
-  let data;
-  try {
-    data = await trpc().directory.get.query({ id });
-  } catch (e) {
-    if (e instanceof TRPCClientError && e.data?.code === "NOT_FOUND") {
-      info.set(null);
-      await deleteDirectoryInfo(id as number);
-      return;
-    }
-    throw new Error("Failed to fetch directory information");
-  }
-
-  const { metadata, subDirectories: subDirectoryIds, files: fileIds } = data;
-
-  if (id === "root") {
-    info.set({ id, subDirectoryIds, fileIds });
-  } else {
-    const { dataKey } = await unwrapDataKey(metadata!.dek, masterKey);
-    const name = await decryptString(metadata!.name, metadata!.nameIv, dataKey);
-
-    info.set({
-      id,
-      parentId: metadata!.parent,
-      dataKey,
-      dataKeyVersion: new Date(metadata!.dekVersion),
-      name,
-      subDirectoryIds,
-      fileIds,
-    });
-    await storeDirectoryInfo({ id, parentId: metadata!.parent, name });
-  }
-};
-
-const fetchDirectoryInfo = async (
-  id: DirectoryId,
-  info: Writable<DirectoryInfo | null>,
-  masterKey: CryptoKey,
-) => {
-  await fetchDirectoryInfoFromIndexedDB(id, info);
-  await fetchDirectoryInfoFromServer(id, info, masterKey);
-};
-
-export const getDirectoryInfo = (id: DirectoryId, masterKey: CryptoKey) => {
-  // TODO: MEK rotation
-
-  let info = directoryInfoStore.get(id);
-  if (!info) {
-    info = writable(null);
-    directoryInfoStore.set(id, info);
-  }
-
-  fetchDirectoryInfo(id, info, masterKey); // Intended
-  return info;
-};
-
-const fetchFileInfoFromIndexedDB = async (id: number, info: Writable<FileInfo | null>) => {
-  if (get(info)) return;
-
-  const file = await getFileInfoFromIndexedDB(id);
-  if (!file) return;
-
-  info.set(file);
-};
-
-const decryptDate = async (ciphertext: string, iv: string, dataKey: CryptoKey) => {
-  return new Date(parseInt(await decryptString(ciphertext, iv, dataKey), 10));
-};
-
-const fetchFileInfoFromServer = async (
-  id: number,
-  info: Writable<FileInfo | null>,
-  masterKey: CryptoKey,
-) => {
-  let metadata;
-  try {
-    metadata = await trpc().file.get.query({ id });
-  } catch (e) {
-    if (e instanceof TRPCClientError && e.data?.code === "NOT_FOUND") {
-      info.set(null);
-      await deleteFileInfo(id);
-      return;
-    }
-    throw new Error("Failed to fetch file information");
-  }
-  const { dataKey } = await unwrapDataKey(metadata.dek, masterKey);
-
-  const name = await decryptString(metadata.name, metadata.nameIv, dataKey);
-  const createdAt =
-    metadata.createdAt && metadata.createdAtIv
-      ? await decryptDate(metadata.createdAt, metadata.createdAtIv, dataKey)
-      : undefined;
-  const lastModifiedAt = await decryptDate(
-    metadata.lastModifiedAt,
-    metadata.lastModifiedAtIv,
-    dataKey,
-  );
-
-  info.set({
-    id,
-    parentId: metadata.parent,
-    dataKey,
-    dataKeyVersion: new Date(metadata.dekVersion),
-    contentType: metadata.contentType,
-    contentIv: metadata.contentIv,
-    name,
-    createdAt,
-    lastModifiedAt,
-    categoryIds: metadata.categories,
-  });
-  await storeFileInfo({
-    id,
-    parentId: metadata.parent,
-    name,
-    contentType: metadata.contentType,
-    createdAt,
-    lastModifiedAt,
-    categoryIds: metadata.categories,
-  });
-};
-
-const fetchFileInfo = async (id: number, info: Writable<FileInfo | null>, masterKey: CryptoKey) => {
-  await fetchFileInfoFromIndexedDB(id, info);
-  await fetchFileInfoFromServer(id, info, masterKey);
-};
-
-export const getFileInfo = (fileId: number, masterKey: CryptoKey) => {
-  // TODO: MEK rotation
-
-  let info = fileInfoStore.get(fileId);
-  if (!info) {
-    info = writable(null);
-    fileInfoStore.set(fileId, info);
-  }
-
-  fetchFileInfo(fileId, info, masterKey); // Intended
-  return info;
-};
-
-const fetchCategoryInfoFromIndexedDB = async (
-  id: CategoryId,
-  info: Writable<CategoryInfo | null>,
-) => {
-  if (get(info)) return;
-
-  const [category, subCategories] = await Promise.all([
-    id !== "root" ? getCategoryInfoFromIndexedDB(id) : undefined,
-    getCategoryInfosFromIndexedDB(id),
-  ]);
-  const subCategoryIds = subCategories.map(({ id }) => id);
-
-  if (id === "root") {
-    info.set({ id, subCategoryIds });
-  } else {
-    if (!category) return;
-    info.set({
-      id,
-      name: category.name,
-      subCategoryIds,
-      files: category.files,
-      isFileRecursive: category.isFileRecursive,
-    });
-  }
-};
-
-const fetchCategoryInfoFromServer = async (
-  id: CategoryId,
-  info: Writable<CategoryInfo | null>,
-  masterKey: CryptoKey,
-) => {
-  let data;
-  try {
-    data = await trpc().category.get.query({ id });
-  } catch (e) {
-    if (e instanceof TRPCClientError && e.data?.code === "NOT_FOUND") {
-      info.set(null);
-      await deleteCategoryInfo(id as number);
-      return;
-    }
-    throw new Error("Failed to fetch category information");
-  }
-
-  const { metadata, subCategories } = data;
-
-  if (id === "root") {
-    info.set({ id, subCategoryIds: subCategories });
-  } else {
-    const { dataKey } = await unwrapDataKey(metadata!.dek, masterKey);
-    const name = await decryptString(metadata!.name, metadata!.nameIv, dataKey);
-
-    let files;
-    try {
-      files = await trpc().category.files.query({ id, recurse: true });
-    } catch {
-      throw new Error("Failed to fetch category files");
-    }
-
-    const filesMapped = files.map(({ file, isRecursive }) => ({ id: file, isRecursive }));
-    let isFileRecursive: boolean | undefined = undefined;
-
-    info.update((value) => {
-      const newValue = {
-        isFileRecursive: false,
-        ...value,
-        id,
-        dataKey,
-        dataKeyVersion: new Date(metadata!.dekVersion),
-        name,
-        subCategoryIds: subCategories,
-        files: filesMapped,
-      };
-      isFileRecursive = newValue.isFileRecursive;
-      return newValue;
-    });
-    await storeCategoryInfo({
-      id,
-      parentId: metadata!.parent,
-      name,
-      files: filesMapped,
-      isFileRecursive: isFileRecursive!,
-    });
-  }
-};
-
-const fetchCategoryInfo = async (
-  id: CategoryId,
-  info: Writable<CategoryInfo | null>,
-  masterKey: CryptoKey,
-) => {
-  await fetchCategoryInfoFromIndexedDB(id, info);
-  await fetchCategoryInfoFromServer(id, info, masterKey);
-};
-
-export const getCategoryInfo = (categoryId: CategoryId, masterKey: CryptoKey) => {
-  // TODO: MEK rotation
-
-  let info = categoryInfoStore.get(categoryId);
-  if (!info) {
-    info = writable(null);
-    categoryInfoStore.set(categoryId, info);
-  }
-
-  fetchCategoryInfo(categoryId, info, masterKey); // Intended
-  return info;
-};
-
-export const updateCategoryInfo = async (
-  categoryId: number,
-  changes: { isFileRecursive?: boolean },
-) => {
-  await updateCategoryInfoInIndexedDB(categoryId, changes);
-  categoryInfoStore.get(categoryId)?.update((value) => {
-    if (!value) return value;
-    if (changes.isFileRecursive !== undefined) {
-      value.isFileRecursive = changes.isFileRecursive;
-    }
-    return value;
-  });
-};

src/lib/modules/filesystem/category.ts

@@ -0,0 +1,164 @@
+import * as IndexedDB from "$lib/indexedDB";
+import { trpc, isTRPCClientError } from "$trpc/client";
+import { FilesystemCache, decryptFileMetadata, decryptCategoryMetadata } from "./internal.svelte";
+import type { MaybeCategoryInfo } from "./types";
+
+const cache = new FilesystemCache<CategoryId, MaybeCategoryInfo, Partial<MaybeCategoryInfo>>();
+
+const fetchFromIndexedDB = async (id: CategoryId) => {
+  const [category, subCategories] = await Promise.all([
+    id !== "root" ? IndexedDB.getCategoryInfo(id) : undefined,
+    IndexedDB.getCategoryInfos(id),
+  ]);
+  const files = category
+    ? await Promise.all(
+        category.files.map(async (file) => {
+          const fileInfo = await IndexedDB.getFileInfo(file.id);
+          return fileInfo
+            ? {
+                id: file.id,
+                contentType: fileInfo.contentType,
+                name: fileInfo.name,
+                createdAt: fileInfo.createdAt,
+                lastModifiedAt: fileInfo.lastModifiedAt,
+                isRecursive: file.isRecursive,
+              }
+            : undefined;
+        }),
+      )
+    : undefined;
+
+  if (id === "root") {
+    return {
+      id,
+      exists: true as const,
+      subCategories,
+    };
+  } else if (category) {
+    return {
+      id,
+      exists: true as const,
+      name: category.name,
+      subCategories,
+      files: files!.filter((file) => !!file),
+      isFileRecursive: category.isFileRecursive,
+    };
+  }
+};
+
+const fetchFromServer = async (id: CategoryId, masterKey: CryptoKey) => {
+  try {
+    const {
+      metadata,
+      subCategories: subCategoriesRaw,
+      files: filesRaw,
+    } = await trpc().category.get.query({ id, recurse: true });
+    const subCategories = await Promise.all(
+      subCategoriesRaw.map(async (category) => {
+        const decrypted = await decryptCategoryMetadata(category, masterKey);
+        const existing = await IndexedDB.getCategoryInfo(category.id);
+        await IndexedDB.storeCategoryInfo({
+          id: category.id,
+          parentId: id,
+          name: decrypted.name,
+          files: existing?.files ?? [],
+          isFileRecursive: existing?.isFileRecursive ?? false,
+        });
+        return {
+          id: category.id,
+          ...decrypted,
+        };
+      }),
+    );
+
+    const existingFiles = filesRaw
+      ? await IndexedDB.bulkGetFileInfos(filesRaw.map((file) => file.id))
+      : [];
+    const files = filesRaw
+      ? await Promise.all(
+          filesRaw.map(async (file, index) => {
+            const decrypted = await decryptFileMetadata(file, masterKey);
+            const existing = existingFiles[index];
+            if (existing) {
+              const categoryIds = file.isRecursive
+                ? existing.categoryIds
+                : Array.from(new Set([...existing.categoryIds, id as number]));
+              await IndexedDB.storeFileInfo({
+                id: file.id,
+                parentId: existing.parentId,
+                contentType: file.contentType,
+                name: decrypted.name,
+                createdAt: decrypted.createdAt,
+                lastModifiedAt: decrypted.lastModifiedAt,
+                categoryIds,
+              });
+            }
+            return {
+              id: file.id,
+              contentType: file.contentType,
+              isRecursive: file.isRecursive,
+              ...decrypted,
+            };
+          }),
+        )
+      : undefined;
+
+    const decryptedMetadata = metadata
+      ? await decryptCategoryMetadata(metadata, masterKey)
+      : undefined;
+    if (id !== "root" && metadata && decryptedMetadata) {
+      const existingCategory = await IndexedDB.getCategoryInfo(id);
+      await IndexedDB.storeCategoryInfo({
+        id: id as number,
+        parentId: metadata.parent,
+        name: decryptedMetadata.name,
+        files:
+          files?.map((file) => ({
+            id: file.id,
+            isRecursive: file.isRecursive,
+          })) ??
+          existingCategory?.files ??
+          [],
+        isFileRecursive: existingCategory?.isFileRecursive ?? false,
+      });
+    }
+
+    if (id === "root") {
+      return {
+        id,
+        exists: true as const,
+        subCategories,
+      };
+    } else {
+      return {
+        id,
+        exists: true as const,
+        subCategories,
+        files,
+        ...decryptedMetadata!,
+      };
+    }
+  } catch (e) {
+    if (isTRPCClientError(e) && e.data?.code === "NOT_FOUND") {
+      await IndexedDB.deleteCategoryInfo(id as number);
+      return { id, exists: false as const };
+    }
+    throw e;
+  }
+};
+
+export const getCategoryInfo = async (id: CategoryId, masterKey: CryptoKey) => {
+  return await cache.get(id, async (isInitial, resolve) => {
+    if (isInitial) {
+      const info = await fetchFromIndexedDB(id);
+      if (info) {
+        resolve(info);
+      }
+    }
+
+    const info = await fetchFromServer(id, masterKey);
+    if (info) {
+      resolve(info);
+    }
+  });
+};

src/lib/modules/filesystem/directory.ts

@@ -0,0 +1,121 @@
+import * as IndexedDB from "$lib/indexedDB";
+import { monotonicResolve } from "$lib/utils";
+import { trpc, isTRPCClientError } from "$trpc/client";
+import { FilesystemCache, decryptDirectoryMetadata, decryptFileMetadata } from "./internal.svelte";
+import type { MaybeDirectoryInfo } from "./types";
+
+const cache = new FilesystemCache<DirectoryId, MaybeDirectoryInfo>();
+
+const fetchFromIndexedDB = async (id: DirectoryId) => {
+  const [directory, subDirectories, files] = await Promise.all([
+    id !== "root" ? IndexedDB.getDirectoryInfo(id) : undefined,
+    IndexedDB.getDirectoryInfos(id),
+    IndexedDB.getFileInfos(id),
+  ]);
+
+  if (id === "root") {
+    return {
+      id,
+      exists: true as const,
+      subDirectories,
+      files,
+    };
+  } else if (directory) {
+    return {
+      id,
+      exists: true as const,
+      parentId: directory.parentId,
+      name: directory.name,
+      subDirectories,
+      files,
+    };
+  }
+};
+
+const fetchFromServer = async (id: DirectoryId, masterKey: CryptoKey) => {
+  try {
+    const {
+      metadata,
+      subDirectories: subDirectoriesRaw,
+      files: filesRaw,
+    } = await trpc().directory.get.query({ id });
+    const existingFiles = await IndexedDB.bulkGetFileInfos(filesRaw.map((file) => file.id));
+    const [subDirectories, files, decryptedMetadata] = await Promise.all([
+      Promise.all(
+        subDirectoriesRaw.map(async (directory) => {
+          const decrypted = await decryptDirectoryMetadata(directory, masterKey);
+          await IndexedDB.storeDirectoryInfo({
+            id: directory.id,
+            parentId: id,
+            name: decrypted.name,
+          });
+          return {
+            id: directory.id,
+            ...decrypted,
+          };
+        }),
+      ),
+      Promise.all(
+        filesRaw.map(async (file, index) => {
+          const decrypted = await decryptFileMetadata(file, masterKey);
+          await IndexedDB.storeFileInfo({
+            id: file.id,
+            parentId: id,
+            contentType: file.contentType,
+            name: decrypted.name,
+            createdAt: decrypted.createdAt,
+            lastModifiedAt: decrypted.lastModifiedAt,
+            categoryIds: existingFiles[index]?.categoryIds ?? [],
+          });
+          return {
+            id: file.id,
+            contentType: file.contentType,
+            ...decrypted,
+          };
+        }),
+      ),
+      metadata ? decryptDirectoryMetadata(metadata, masterKey) : undefined,
+    ]);
+
+    if (id !== "root" && metadata && decryptedMetadata) {
+      await IndexedDB.storeDirectoryInfo({
+        id,
+        parentId: metadata.parent,
+        name: decryptedMetadata.name,
+      });
+    }
+
+    if (id === "root") {
+      return {
+        id,
+        exists: true as const,
+        subDirectories,
+        files,
+      };
+    } else {
+      return {
+        id,
+        exists: true as const,
+        parentId: metadata!.parent,
+        subDirectories,
+        files,
+        ...decryptedMetadata!,
+      };
+    }
+  } catch (e) {
+    if (isTRPCClientError(e) && e.data?.code === "NOT_FOUND") {
+      await IndexedDB.deleteDirectoryInfo(id as number);
+      return { id, exists: false as const };
+    }
+    throw e;
+  }
+};
+
+export const getDirectoryInfo = async (id: DirectoryId, masterKey: CryptoKey) => {
+  return await cache.get(id, (isInitial, resolve) =>
+    monotonicResolve(
+      [isInitial && fetchFromIndexedDB(id), fetchFromServer(id, masterKey)],
+      resolve,
+    ),
+  );
+};

src/lib/modules/filesystem/file.ts

@@ -0,0 +1,175 @@
+import * as IndexedDB from "$lib/indexedDB";
+import { monotonicResolve } from "$lib/utils";
+import { trpc, isTRPCClientError } from "$trpc/client";
+import { FilesystemCache, decryptFileMetadata, decryptCategoryMetadata } from "./internal.svelte";
+import type { MaybeFileInfo } from "./types";
+
+const cache = new FilesystemCache<number, MaybeFileInfo>();
+
+const fetchFromIndexedDB = async (id: number) => {
+  const file = await IndexedDB.getFileInfo(id);
+  const categories = file
+    ? await Promise.all(
+        file.categoryIds.map(async (categoryId) => {
+          const category = await IndexedDB.getCategoryInfo(categoryId);
+          return category ? { id: category.id, name: category.name } : undefined;
+        }),
+      )
+    : undefined;
+
+  if (file) {
+    return {
+      id,
+      exists: true as const,
+      parentId: file.parentId,
+      contentType: file.contentType,
+      name: file.name,
+      createdAt: file.createdAt,
+      lastModifiedAt: file.lastModifiedAt,
+      categories: categories!.filter((category) => !!category),
+    };
+  }
+};
+
+const bulkFetchFromIndexedDB = async (ids: number[]) => {
+  const files = await IndexedDB.bulkGetFileInfos(ids);
+  const categories = await Promise.all(
+    files.map(async (file) =>
+      file
+        ? await Promise.all(
+            file.categoryIds.map(async (categoryId) => {
+              const category = await IndexedDB.getCategoryInfo(categoryId);
+              return category ? { id: category.id, name: category.name } : undefined;
+            }),
+          )
+        : undefined,
+    ),
+  );
+  return new Map(
+    files
+      .map((file, index) =>
+        file
+          ? ([
+              file.id,
+              {
+                ...file,
+                exists: true,
+                categories: categories[index]!.filter((category) => !!category),
+              },
+            ] as const)
+          : undefined,
+      )
+      .filter((file) => !!file),
+  );
+};
+
+const fetchFromServer = async (id: number, masterKey: CryptoKey) => {
+  try {
+    const { categories: categoriesRaw, ...metadata } = await trpc().file.get.query({ id });
+    const [categories, decryptedMetadata] = await Promise.all([
+      Promise.all(
+        categoriesRaw.map(async (category) => ({
+          id: category.id,
+          ...(await decryptCategoryMetadata(category, masterKey)),
+        })),
+      ),
+      decryptFileMetadata(metadata, masterKey),
+    ]);
+
+    await IndexedDB.storeFileInfo({
+      id,
+      parentId: metadata.parent,
+      contentType: metadata.contentType,
+      name: decryptedMetadata.name,
+      createdAt: decryptedMetadata.createdAt,
+      lastModifiedAt: decryptedMetadata.lastModifiedAt,
+      categoryIds: categories.map((category) => category.id),
+    });
+
+    return {
+      id,
+      exists: true as const,
+      parentId: metadata.parent,
+      contentType: metadata.contentType,
+      contentIv: metadata.contentIv,
+      categories,
+      ...decryptedMetadata,
+    };
+  } catch (e) {
+    if (isTRPCClientError(e) && e.data?.code === "NOT_FOUND") {
+      await IndexedDB.deleteFileInfo(id);
+      return { id, exists: false as const };
+    }
+    throw e;
+  }
+};
+
+const bulkFetchFromServer = async (ids: number[], masterKey: CryptoKey) => {
+  const filesRaw = await trpc().file.bulkGet.query({ ids });
+  const files = await Promise.all(
+    filesRaw.map(async (file) => {
+      const [categories, decryptedMetadata] = await Promise.all([
+        Promise.all(
+          file.categories.map(async (category) => ({
+            id: category.id,
+            ...(await decryptCategoryMetadata(category, masterKey)),
+          })),
+        ),
+        decryptFileMetadata(file, masterKey),
+      ]);
+
+      await IndexedDB.storeFileInfo({
+        id: file.id,
+        parentId: file.parent,
+        contentType: file.contentType,
+        name: decryptedMetadata.name,
+        createdAt: decryptedMetadata.createdAt,
+        lastModifiedAt: decryptedMetadata.lastModifiedAt,
+        categoryIds: categories.map((category) => category.id),
+      });
+      return {
+        id: file.id,
+        exists: true as const,
+        parentId: file.parent,
+        contentType: file.contentType,
+        contentIv: file.contentIv,
+        categories,
+        ...decryptedMetadata,
+      };
+    }),
+  );
+
+  const existingIds = new Set(filesRaw.map(({ id }) => id));
+  return new Map<number, MaybeFileInfo>([
+    ...files.map((file) => [file.id, file] as const),
+    ...ids.filter((id) => !existingIds.has(id)).map((id) => [id, { id, exists: false }] as const),
+  ]);
+};
+
+export const getFileInfo = async (id: number, masterKey: CryptoKey) => {
+  return await cache.get(id, (isInitial, resolve) =>
+    monotonicResolve(
+      [isInitial && fetchFromIndexedDB(id), fetchFromServer(id, masterKey)],
+      resolve,
+    ),
+  );
+};
+
+export const bulkGetFileInfo = async (ids: number[], masterKey: CryptoKey) => {
+  return await cache.bulkGet(new Set(ids), (keys, resolve) =>
+    monotonicResolve(
+      [
+        bulkFetchFromIndexedDB(
+          Array.from(
+            keys
+              .entries()
+              .filter(([, isInitial]) => isInitial)
+              .map(([key]) => key),
+          ),
+        ),
+        bulkFetchFromServer(Array.from(keys.keys()), masterKey),
+      ],
+      resolve,
+    ),
+  );
+};

src/lib/modules/filesystem/index.ts

@@ -0,0 +1,4 @@
+export * from "./category";
+export * from "./directory";
+export * from "./file";
+export * from "./types";

src/lib/modules/filesystem/internal.svelte.ts

@@ -0,0 +1,130 @@
+import { unwrapDataKey, decryptString } from "$lib/modules/crypto";
+
+export class FilesystemCache<K, V extends RV, RV = V> {
+  private map = new Map<K, V | Promise<V>>();
+
+  get(key: K, loader: (isInitial: boolean, resolve: (value: RV | undefined) => void) => void) {
+    const info = this.map.get(key);
+    if (info instanceof Promise) {
+      return info;
+    }
+
+    const { promise, resolve } = Promise.withResolvers<V>();
+    if (!info) {
+      this.map.set(key, promise);
+    }
+
+    loader(!info, (loadedInfo) => {
+      if (!loadedInfo) return;
+
+      const info = this.map.get(key)!;
+      if (info instanceof Promise) {
+        const state = $state(loadedInfo);
+        this.map.set(key, state as V);
+        resolve(state as V);
+      } else {
+        Object.assign(info, loadedInfo);
+        resolve(info);
+      }
+    });
+
+    return info ?? promise;
+  }
+
+  async bulkGet(
+    keys: Set<K>,
+    loader: (keys: Map<K, boolean>, resolve: (values: Map<K, RV>) => void) => void,
+  ) {
+    const states = new Map<K, V>();
+    const promises = new Map<K, Promise<V>>();
+    const resolvers = new Map<K, (value: V) => void>();
+
+    keys.forEach((key) => {
+      const info = this.map.get(key);
+      if (info instanceof Promise) {
+        promises.set(key, info);
+      } else if (info) {
+        states.set(key, info);
+      } else {
+        const { promise, resolve } = Promise.withResolvers<V>();
+        this.map.set(key, promise);
+        promises.set(key, promise);
+        resolvers.set(key, resolve);
+      }
+    });
+
+    loader(
+      new Map([
+        ...states.keys().map((key) => [key, false] as const),
+        ...resolvers.keys().map((key) => [key, true] as const),
+      ]),
+      (loadedInfos) =>
+        loadedInfos.forEach((loadedInfo, key) => {
+          const info = this.map.get(key)!;
+          const resolve = resolvers.get(key);
+          if (info instanceof Promise) {
+            const state = $state(loadedInfo);
+            this.map.set(key, state as V);
+            resolve?.(state as V);
+          } else {
+            Object.assign(info, loadedInfo);
+            resolve?.(info);
+          }
+        }),
+    );
+
+    const newStates = await Promise.all(
+      promises.entries().map(async ([key, promise]) => [key, await promise] as const),
+    );
+    return new Map([...states, ...newStates]);
+  }
+}
+
+export const decryptDirectoryMetadata = async (
+  metadata: { dek: string; dekVersion: Date; name: string; nameIv: string },
+  masterKey: CryptoKey,
+) => {
+  const { dataKey } = await unwrapDataKey(metadata.dek, masterKey);
+  const name = await decryptString(metadata.name, metadata.nameIv, dataKey);
+
+  return {
+    dataKey: { key: dataKey, version: metadata.dekVersion },
+    name,
+  };
+};
+
+const decryptDate = async (ciphertext: string, iv: string, dataKey: CryptoKey) => {
+  return new Date(parseInt(await decryptString(ciphertext, iv, dataKey), 10));
+};
+
+export const decryptFileMetadata = async (
+  metadata: {
+    dek: string;
+    dekVersion: Date;
+    name: string;
+    nameIv: string;
+    createdAt?: string;
+    createdAtIv?: string;
+    lastModifiedAt: string;
+    lastModifiedAtIv: string;
+  },
+  masterKey: CryptoKey,
+) => {
+  const { dataKey } = await unwrapDataKey(metadata.dek, masterKey);
+  const [name, createdAt, lastModifiedAt] = await Promise.all([
+    decryptString(metadata.name, metadata.nameIv, dataKey),
+    metadata.createdAt
+      ? decryptDate(metadata.createdAt, metadata.createdAtIv!, dataKey)
+      : undefined,
+    decryptDate(metadata.lastModifiedAt, metadata.lastModifiedAtIv, dataKey),
+  ]);
+
+  return {
+    dataKey: { key: dataKey, version: metadata.dekVersion },
+    name,
+    createdAt,
+    lastModifiedAt,
+  };
+};
+
+export const decryptCategoryMetadata = decryptDirectoryMetadata;

src/lib/modules/filesystem/types.ts

@@ -0,0 +1,71 @@
+export type DataKey = { key: CryptoKey; version: Date };
+type AllUndefined<T> = { [K in keyof T]?: undefined };
+
+interface LocalDirectoryInfo {
+  id: number;
+  parentId: DirectoryId;
+  dataKey?: DataKey;
+  name: string;
+  subDirectories: SubDirectoryInfo[];
+  files: SummarizedFileInfo[];
+}
+
+interface RootDirectoryInfo {
+  id: "root";
+  parentId?: undefined;
+  dataKey?: undefined;
+  name?: undefined;
+  subDirectories: SubDirectoryInfo[];
+  files: SummarizedFileInfo[];
+}
+
+export type DirectoryInfo = LocalDirectoryInfo | RootDirectoryInfo;
+export type SubDirectoryInfo = Omit<LocalDirectoryInfo, "parentId" | "subDirectories" | "files">;
+export type MaybeDirectoryInfo =
+  | (DirectoryInfo & { exists: true })
+  | ({ id: DirectoryId; exists: false } & AllUndefined<Omit<DirectoryInfo, "id">>);
+
+export interface FileInfo {
+  id: number;
+  parentId: DirectoryId;
+  dataKey?: DataKey;
+  contentType: string;
+  contentIv?: string;
+  name: string;
+  createdAt?: Date;
+  lastModifiedAt: Date;
+  categories: { id: number; name: string }[];
+}
+
+export type SummarizedFileInfo = Omit<FileInfo, "parentId" | "contentIv" | "categories">;
+export type CategoryFileInfo = SummarizedFileInfo & { isRecursive: boolean };
+export type MaybeFileInfo =
+  | (FileInfo & { exists: true })
+  | ({ id: number; exists: false } & AllUndefined<Omit<FileInfo, "id">>);
+
+interface LocalCategoryInfo {
+  id: number;
+  dataKey?: DataKey;
+  name: string;
+  subCategories: SubCategoryInfo[];
+  files: CategoryFileInfo[];
+  isFileRecursive: boolean;
+}
+
+interface RootCategoryInfo {
+  id: "root";
+  dataKey?: undefined;
+  name?: undefined;
+  subCategories: SubCategoryInfo[];
+  files?: undefined;
+  isFileRecursive?: undefined;
+}
+
+export type CategoryInfo = LocalCategoryInfo | RootCategoryInfo;
+export type SubCategoryInfo = Omit<
+  LocalCategoryInfo,
+  "subCategories" | "files" | "isFileRecursive"
+>;
+export type MaybeCategoryInfo =
+  | (CategoryInfo & { exists: true })
+  | ({ id: CategoryId; exists: false } & AllUndefined<Omit<CategoryInfo, "id">>);

src/lib/modules/scheduler.ts

@@ -0,0 +1,41 @@
+export class Scheduler<T = void> {
+  private tasks = 0;
+  private memoryUsage = 0;
+  private queue: (() => void)[] = [];
+
+  constructor(public memoryLimit = 100 * 1024 * 1024 /* 100 MiB */) {}
+
+  private next() {
+    if (this.memoryUsage < this.memoryLimit) {
+      this.queue.shift()?.();
+    }
+  }
+
+  async schedule(estimateMemoryUsage: () => Promise<number>, task: () => Promise<T>) {
+    if (this.tasks++ > 0) {
+      await new Promise<void>((resolve) => {
+        this.queue.push(resolve);
+      });
+    }
+
+    while (this.memoryUsage >= this.memoryLimit) {
+      await new Promise<void>((resolve) => {
+        this.queue.unshift(resolve);
+      });
+    }
+
+    let taskMemoryUsage = 0;
+
+    try {
+      taskMemoryUsage = await estimateMemoryUsage();
+      this.memoryUsage += taskMemoryUsage;
+      this.next();
+
+      return await task();
+    } finally {
+      this.tasks--;
+      this.memoryUsage -= taskMemoryUsage;
+      this.next();
+    }
+  }
+}

src/lib/server/db/category.ts

@@ -2,8 +2,6 @@ import { IntegrityError } from "./error";
 import db from "./kysely";
 import type { Ciphertext } from "./schema";
 
-export type CategoryId = "root" | number;
-
 interface Category {
   id: number;
   parentId: CategoryId;

src/lib/server/db/file.ts

@@ -1,11 +1,10 @@
-import { sql, type NotNull } from "kysely";
+import { sql } from "kysely";
+import { jsonArrayFrom } from "kysely/helpers/postgres";
 import pg from "pg";
 import { IntegrityError } from "./error";
 import db from "./kysely";
 import type { Ciphertext } from "./schema";
 
-export type DirectoryId = "root" | number;
-
 interface Directory {
   id: number;
   parentId: DirectoryId;
@@ -38,6 +37,14 @@ interface File {
 
 export type NewFile = Omit<File, "id">;
 
+interface FileCategory {
+  id: number;
+  mekVersion: number;
+  encDek: string;
+  dekVersion: Date;
+  encName: Ciphertext;
+}
+
 export const registerDirectory = async (params: NewDirectory) => {
   await db.transaction().execute(async (trx) => {
     const mek = await trx
@@ -306,39 +313,51 @@ export const getAllFilesByCategory = async (
   recurse: boolean,
 ) => {
   const files = await db
-    .withRecursive("cte", (db) =>
+    .withRecursive("category_tree", (db) =>
       db
         .selectFrom("category")
-        .leftJoin("file_category", "category.id", "file_category.category_id")
-        .select(["id", "parent_id", "user_id", "file_category.file_id"])
-        .select(sql<number>`0`.as("depth"))
+        .select(["id", sql<number>`0`.as("depth")])
         .where("id", "=", categoryId)
+        .where("user_id", "=", userId)
         .$if(recurse, (qb) =>
           qb.unionAll((db) =>
             db
               .selectFrom("category")
-              .leftJoin("file_category", "category.id", "file_category.category_id")
-              .innerJoin("cte", "category.parent_id", "cte.id")
-              .select([
-                "category.id",
-                "category.parent_id",
-                "category.user_id",
-                "file_category.file_id",
-              ])
-              .select(sql<number>`cte.depth + 1`.as("depth")),
+              .innerJoin("category_tree", "category.parent_id", "category_tree.id")
+              .select(["category.id", sql<number>`depth + 1`.as("depth")]),
           ),
         ),
     )
-    .selectFrom("cte")
+    .selectFrom("category_tree")
+    .innerJoin("file_category", "category_tree.id", "file_category.category_id")
+    .innerJoin("file", "file_category.file_id", "file.id")
     .select(["file_id", "depth"])
+    .selectAll("file")
     .distinctOn("file_id")
-    .where("user_id", "=", userId)
-    .where("file_id", "is not", null)
-    .$narrowType<{ file_id: NotNull }>()
     .orderBy("file_id")
     .orderBy("depth")
     .execute();
-  return files.map(({ file_id, depth }) => ({ id: file_id, isRecursive: depth > 0 }));
+  return files.map(
+    (file) =>
+      ({
+        id: file.file_id,
+        parentId: file.parent_id ?? "root",
+        userId: file.user_id,
+        path: file.path,
+        mekVersion: file.master_encryption_key_version,
+        encDek: file.encrypted_data_encryption_key,
+        dekVersion: file.data_encryption_key_version,
+        hskVersion: file.hmac_secret_key_version,
+        contentHmac: file.content_hmac,
+        contentType: file.content_type,
+        encContentIv: file.encrypted_content_iv,
+        encContentHash: file.encrypted_content_hash,
+        encName: file.encrypted_name,
+        encCreatedAt: file.encrypted_created_at,
+        encLastModifiedAt: file.encrypted_last_modified_at,
+        isRecursive: file.depth > 0,
+      }) satisfies File & { isRecursive: boolean },
+  );
 };
 
 export const getAllFileIds = async (userId: number) => {
@@ -390,6 +409,51 @@ export const getFile = async (userId: number, fileId: number) => {
     : null;
 };
 
+export const getFilesWithCategories = async (userId: number, fileIds: number[]) => {
+  const files = await db
+    .selectFrom("file")
+    .selectAll()
+    .select((eb) =>
+      jsonArrayFrom(
+        eb
+          .selectFrom("file_category")
+          .innerJoin("category", "file_category.category_id", "category.id")
+          .where("file_category.file_id", "=", eb.ref("file.id"))
+          .selectAll("category"),
+      ).as("categories"),
+    )
+    .where("id", "=", (eb) => eb.fn.any(eb.val(fileIds)))
+    .where("user_id", "=", userId)
+    .execute();
+  return files.map(
+    (file) =>
+      ({
+        id: file.id,
+        parentId: file.parent_id ?? "root",
+        userId: file.user_id,
+        path: file.path,
+        mekVersion: file.master_encryption_key_version,
+        encDek: file.encrypted_data_encryption_key,
+        dekVersion: file.data_encryption_key_version,
+        hskVersion: file.hmac_secret_key_version,
+        contentHmac: file.content_hmac,
+        contentType: file.content_type,
+        encContentIv: file.encrypted_content_iv,
+        encContentHash: file.encrypted_content_hash,
+        encName: file.encrypted_name,
+        encCreatedAt: file.encrypted_created_at,
+        encLastModifiedAt: file.encrypted_last_modified_at,
+        categories: file.categories.map((category) => ({
+          id: category.id,
+          mekVersion: category.master_encryption_key_version,
+          encDek: category.encrypted_data_encryption_key,
+          dekVersion: new Date(category.data_encryption_key_version),
+          encName: category.encrypted_name,
+        })),
+      }) satisfies File & { categories: FileCategory[] },
+  );
+};
+
 export const setFileEncName = async (
   userId: number,
   fileId: number,
@@ -476,10 +540,20 @@ export const addFileToCategory = async (fileId: number, categoryId: number) => {
 export const getAllFileCategories = async (fileId: number) => {
   const categories = await db
     .selectFrom("file_category")
-    .select("category_id")
+    .innerJoin("category", "file_category.category_id", "category.id")
+    .selectAll("category")
     .where("file_id", "=", fileId)
     .execute();
-  return categories.map(({ category_id }) => ({ id: category_id }));
+  return categories.map(
+    (category) =>
+      ({
+        id: category.id,
+        mekVersion: category.master_encryption_key_version,
+        encDek: category.encrypted_data_encryption_key,
+        dekVersion: category.data_encryption_key_version,
+        encName: category.encrypted_name,
+      }) satisfies FileCategory,
+  );
 };
 
 export const removeFileFromCategory = async (fileId: number, categoryId: number) => {

src/lib/services/auth.ts

@@ -1,6 +1,5 @@
-import { TRPCClientError } from "@trpc/client";
 import { encodeToBase64, decryptChallenge, signMessageRSA } from "$lib/modules/crypto";
-import { trpc } from "$trpc/client";
+import { trpc, isTRPCClientError } from "$trpc/client";
 
 export const requestSessionUpgrade = async (
   encryptKeyBase64: string,
@@ -16,7 +15,7 @@ export const requestSessionUpgrade = async (
       sigPubKey: verifyKeyBase64,
     }));
   } catch (e) {
-    if (e instanceof TRPCClientError && e.data?.code === "FORBIDDEN") {
+    if (isTRPCClientError(e) && e.data?.code === "FORBIDDEN") {
       return [false, "Unregistered client"] as const;
     }
     return [false] as const;
@@ -31,7 +30,7 @@ export const requestSessionUpgrade = async (
       force,
     });
   } catch (e) {
-    if (e instanceof TRPCClientError && e.data?.code === "CONFLICT") {
+    if (isTRPCClientError(e) && e.data?.code === "CONFLICT") {
       return [false, "Already logged in"] as const;
     }
     return [false] as const;

src/lib/services/key.ts

@@ -1,4 +1,3 @@
-import { TRPCClientError } from "@trpc/client";
 import { storeMasterKeys } from "$lib/indexedDB";
 import {
   encodeToBase64,
@@ -11,7 +10,7 @@ import {
 } from "$lib/modules/crypto";
 import { requestSessionUpgrade } from "$lib/services/auth";
 import { masterKeyStore, type ClientKeys } from "$lib/stores";
-import { trpc } from "$trpc/client";
+import { trpc, isTRPCClientError } from "$trpc/client";
 
 export const requestClientRegistration = async (
   encryptKeyBase64: string,
@@ -112,10 +111,7 @@ export const requestInitialMasterKeyAndHmacSecretRegistration = async (
       mekSig: await signMasterKeyWrapped(masterKeyWrapped, 1, signKey),
     });
   } catch (e) {
-    if (
-      e instanceof TRPCClientError &&
-      (e.data?.code === "FORBIDDEN" || e.data?.code === "CONFLICT")
-    ) {
+    if (isTRPCClientError(e) && (e.data?.code === "FORBIDDEN" || e.data?.code === "CONFLICT")) {
       return true;
     }
     // TODO: Error Handling

src/lib/stores/file.ts

@@ -1,49 +0,0 @@
-import { writable, type Writable } from "svelte/store";
-
-export interface FileUploadStatus {
-  name: string;
-  parentId: "root" | number;
-  status:
-    | "encryption-pending"
-    | "encrypting"
-    | "upload-pending"
-    | "uploading"
-    | "uploaded"
-    | "canceled"
-    | "error";
-  progress?: number;
-  rate?: number;
-  estimated?: number;
-}
-
-export interface FileDownloadStatus {
-  id: number;
-  status:
-    | "download-pending"
-    | "downloading"
-    | "decryption-pending"
-    | "decrypting"
-    | "decrypted"
-    | "canceled"
-    | "error";
-  progress?: number;
-  rate?: number;
-  estimated?: number;
-  result?: ArrayBuffer;
-}
-
-export const fileUploadStatusStore = writable<Writable<FileUploadStatus>[]>([]);
-
-export const fileDownloadStatusStore = writable<Writable<FileDownloadStatus>[]>([]);
-
-export const isFileUploading = (
-  status: FileUploadStatus["status"],
-): status is "encryption-pending" | "encrypting" | "upload-pending" | "uploading" => {
-  return ["encryption-pending", "encrypting", "upload-pending", "uploading"].includes(status);
-};
-
-export const isFileDownloading = (
-  status: FileDownloadStatus["status"],
-): status is "download-pending" | "downloading" | "decryption-pending" | "decrypting" => {
-  return ["download-pending", "downloading", "decryption-pending", "decrypting"].includes(status);
-};

src/lib/stores/index.ts

@@ -1,2 +1 @@
-export * from "./file";
 export * from "./key";

src/lib/types/filesystem.d.ts

@@ -0,0 +1,2 @@
+type DirectoryId = "root" | number;
+type CategoryId = "root" | number;

src/lib/utils/index.ts

@@ -1,3 +1,4 @@
 export * from "./format";
 export * from "./gotoStateful";
+export * from "./promise";
 export * from "./sort";

src/lib/utils/promise.ts

@@ -0,0 +1,16 @@
+export const monotonicResolve = <T>(
+  promises: (Promise<T> | false)[],
+  callback: (value: T) => void,
+) => {
+  let latestResolvedIndex = -1;
+  promises
+    .filter((promise) => !!promise)
+    .forEach((promise, index) => {
+      promise.then((value) => {
+        if (index > latestResolvedIndex) {
+          latestResolvedIndex = index;
+          callback(value);
+        }
+      });
+    });
+};

src/lib/utils/sort.ts

@@ -32,7 +32,7 @@ const sortByDateAsc: SortFunc = ({ date: a }, { date: b }) => {
 
 const sortByDateDesc: SortFunc = (a, b) => -sortByDateAsc(a, b);
 
-export const sortEntries = <T extends SortEntry>(entries: T[], sortBy: SortBy) => {
+export const sortEntries = <T extends SortEntry>(entries: T[], sortBy = SortBy.NAME_ASC) => {
   let sortFunc: SortFunc;
 
   switch (sortBy) {
@@ -54,4 +54,5 @@ export const sortEntries = <T extends SortEntry>(entries: T[], sortBy: SortBy) =
   }
 
   entries.sort(sortFunc);
+  return entries;
 };

src/routes/(fullscreen)/file/[id]/+page.svelte

@@ -1,19 +1,14 @@
 <script lang="ts">
   import FileSaver from "file-saver";
   import { untrack } from "svelte";
-  import { get, type Writable } from "svelte/store";
   import { goto } from "$app/navigation";
   import { page } from "$app/state";
   import { FullscreenDiv } from "$lib/components/atoms";
   import { Categories, IconEntryButton, TopBar } from "$lib/components/molecules";
-  import {
-    getFileInfo,
-    getCategoryInfo,
-    type FileInfo,
-    type CategoryInfo,
-  } from "$lib/modules/filesystem";
+  import { getFileInfo, type FileInfo, type MaybeFileInfo } from "$lib/modules/filesystem";
   import { captureVideoThumbnail } from "$lib/modules/thumbnail";
-  import { fileDownloadStatusStore, isFileDownloading, masterKeyStore } from "$lib/stores";
+  import { getFileDownloadState } from "$lib/modules/file";
+  import { masterKeyStore } from "$lib/stores";
   import AddToCategoryBottomSheet from "./AddToCategoryBottomSheet.svelte";
   import DownloadStatus from "./DownloadStatus.svelte";
   import {
@@ -31,19 +26,13 @@
 
   let { data } = $props();
 
-  let info: Writable<FileInfo | null> | undefined = $state();
-  let categories: Writable<CategoryInfo | null>[] = $state([]);
+  let infoPromise: Promise<MaybeFileInfo> | undefined = $state();
+  let info: FileInfo | null = $state(null);
+  let downloadState = $derived(getFileDownloadState(data.id));
 
   let isMenuOpen = $state(false);
   let isAddToCategoryBottomSheetOpen = $state(false);
 
-  let downloadStatus = $derived(
-    $fileDownloadStatusStore.find((statusStore) => {
-      const { id, status } = get(statusStore);
-      return id === data.id && isFileDownloading(status);
-    }),
-  );
-
   let isDownloadRequested = $state(false);
   let viewerType: "image" | "video" | undefined = $state();
   let fileBlob: Blob | undefined = $state();
@@ -76,28 +65,29 @@
   const addToCategory = async (categoryId: number) => {
     await requestFileAdditionToCategory(data.id, categoryId);
     isAddToCategoryBottomSheetOpen = false;
-    info = getFileInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+    infoPromise = getFileInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
   };
 
   const removeFromCategory = async (categoryId: number) => {
     await requestFileRemovalFromCategory(data.id, categoryId);
-    info = getFileInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+    infoPromise = getFileInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
   };
 
   $effect(() => {
-    info = getFileInfo(data.id, $masterKeyStore?.get(1)?.key!);
+    infoPromise = getFileInfo(data.id, $masterKeyStore?.get(1)?.key!).then((fileInfo) => {
+      if (fileInfo.exists) {
+        info = fileInfo;
+      }
+      return fileInfo;
+    });
+    info = null;
     isDownloadRequested = false;
     viewerType = undefined;
   });
 
   $effect(() => {
-    categories =
-      $info?.categoryIds.map((id) => getCategoryInfo(id, $masterKeyStore?.get(1)?.key!)) ?? [];
-  });
-
-  $effect(() => {
-    if ($info && $info.dataKey && $info.contentIv) {
-      const contentType = $info.contentType;
+    if (info?.dataKey) {
+      const contentType = info.contentType;
       if (contentType.startsWith("image")) {
         viewerType = "image";
       } else if (contentType.startsWith("video")) {
@@ -105,24 +95,24 @@
       }
 
       untrack(() => {
-        if (!downloadStatus && !isDownloadRequested) {
+        if (!downloadState && !isDownloadRequested) {
           isDownloadRequested = true;
-          requestFileDownload(data.id, $info.contentIv!, $info.dataKey!).then(async (buffer) => {
-            const blob = await updateViewer(buffer, contentType);
-            if (!viewerType) {
-              FileSaver.saveAs(blob, $info.name);
-            }
-          });
+          requestFileDownload(data.id, info!.contentIv!, info!.dataKey!.key).then(
+            async (buffer) => {
+              const blob = await updateViewer(buffer, contentType);
+              if (!viewerType) {
+                FileSaver.saveAs(blob, info!.name);
+              }
+            },
+          );
         }
       });
     }
   });
 
   $effect(() => {
-    if ($info && $downloadStatus?.status === "decrypted") {
-      untrack(
-        () => !isDownloadRequested && updateViewer($downloadStatus.result!, $info.contentType),
-      );
+    if (info && downloadState?.status === "decrypted") {
+      untrack(() => !isDownloadRequested && updateViewer(downloadState.result!, info!.contentType));
     }
   });
 
@@ -133,82 +123,88 @@
   <title>파일</title>
 </svelte:head>
 
-<TopBar title={$info?.name}>
-  <!-- svelte-ignore a11y_no_static_element_interactions -->
-  <!-- svelte-ignore a11y_click_events_have_key_events -->
-  <div onclick={(e) => e.stopPropagation()}>
-    <button
-      onclick={() => (isMenuOpen = !isMenuOpen)}
-      class="w-[2.3rem] flex-shrink-0 rounded-full p-1 active:bg-black active:bg-opacity-[0.04]"
-    >
-      <IconMoreVert class="text-2xl" />
-    </button>
-    <TopBarMenu
-      bind:isOpen={isMenuOpen}
-      directoryId={page.url.searchParams.get("from") === "category" ? $info?.parentId : undefined}
-      {fileBlob}
-      filename={$info?.name}
-    />
-  </div>
-</TopBar>
-<FullscreenDiv>
-  <div class="space-y-4 pb-4">
-    <DownloadStatus status={downloadStatus} />
-    {#if $info && viewerType}
-      <div class="flex w-full justify-center">
-        {#snippet viewerLoading(message: string)}
-          <p class="text-gray-500">{message}</p>
-        {/snippet}
+{#if info}
+  <TopBar title={info.name}>
+    <!-- svelte-ignore a11y_no_static_element_interactions -->
+    <!-- svelte-ignore a11y_click_events_have_key_events -->
+    <div onclick={(e) => e.stopPropagation()}>
+      <button
+        onclick={() => (isMenuOpen = !isMenuOpen)}
+        class="w-[2.3rem] flex-shrink-0 rounded-full p-1 active:bg-black active:bg-opacity-[0.04]"
+      >
+        <IconMoreVert class="text-2xl" />
+      </button>
+      <TopBarMenu
+        bind:isOpen={isMenuOpen}
+        directoryId={["category", "gallery"].includes(page.url.searchParams.get("from") ?? "")
+          ? info.parentId
+          : undefined}
+        {fileBlob}
+        filename={info.name}
+      />
+    </div>
+  </TopBar>
+  <FullscreenDiv>
+    <div class="space-y-4 pb-4">
+      {#if downloadState}
+        <DownloadStatus state={downloadState} />
+      {/if}
+      {#if viewerType}
+        <div class="flex w-full justify-center">
+          {#snippet viewerLoading(message: string)}
+            <p class="text-gray-500">{message}</p>
+          {/snippet}
 
-        {#if viewerType === "image"}
-          {#if fileBlobUrl}
-            <img src={fileBlobUrl} alt={$info.name} onerror={convertHeicToJpeg} />
-          {:else}
-            {@render viewerLoading("이미지를 불러오고 있어요.")}
+          {#if viewerType === "image"}
+            {#if fileBlobUrl}
+              <img src={fileBlobUrl} alt={info.name} onerror={convertHeicToJpeg} />
+            {:else}
+              {@render viewerLoading("이미지를 불러오고 있어요.")}
+            {/if}
+          {:else if viewerType === "video"}
+            {#if fileBlobUrl}
+              <div class="flex flex-col space-y-2">
+                <!-- svelte-ignore a11y_media_has_caption -->
+                <video bind:this={videoElement} src={fileBlobUrl} controls muted></video>
+                <IconEntryButton
+                  icon={IconCamera}
+                  onclick={() => updateThumbnail(info?.dataKey?.key!, info?.dataKey?.version!)}
+                  class="w-full"
+                >
+                  이 장면을 썸네일로 설정하기
+                </IconEntryButton>
+              </div>
+            {:else}
+              {@render viewerLoading("비디오를 불러오고 있어요.")}
+            {/if}
           {/if}
-        {:else if viewerType === "video"}
-          {#if fileBlobUrl}
-            <div class="flex flex-col space-y-2">
-              <!-- svelte-ignore a11y_media_has_caption -->
-              <video bind:this={videoElement} src={fileBlobUrl} controls muted></video>
-              <IconEntryButton
-                icon={IconCamera}
-                onclick={() => updateThumbnail($info.dataKey!, $info.dataKeyVersion!)}
-                class="w-full"
-              >
-                이 장면을 썸네일로 설정하기
-              </IconEntryButton>
-            </div>
-          {:else}
-            {@render viewerLoading("비디오를 불러오고 있어요.")}
-          {/if}
-        {/if}
-      </div>
-    {/if}
-    <div class="space-y-2">
-      <p class="text-lg font-bold">카테고리</p>
-      <div class="space-y-1">
-        <Categories
-          {categories}
-          categoryMenuIcon={IconClose}
-          onCategoryClick={({ id }) => goto(`/category/${id}`)}
-          onCategoryMenuClick={({ id }) => removeFromCategory(id)}
-        />
-        <IconEntryButton
-          icon={IconAddCircle}
-          onclick={() => (isAddToCategoryBottomSheetOpen = true)}
-          class="h-12 w-full"
-          iconClass="text-gray-600"
-          textClass="text-gray-700"
-        >
-          카테고리에 추가하기
-        </IconEntryButton>
+        </div>
+      {/if}
+      <div class="space-y-2">
+        <p class="text-lg font-bold">카테고리</p>
+        <div class="space-y-1">
+          <Categories
+            categories={info.categories}
+            categoryMenuIcon={IconClose}
+            onCategoryClick={({ id }) => goto(`/category/${id}`)}
+            onCategoryMenuClick={({ id }) => removeFromCategory(id)}
+          />
+          <IconEntryButton
+            icon={IconAddCircle}
+            onclick={() => (isAddToCategoryBottomSheetOpen = true)}
+            class="h-12 w-full"
+            iconClass="text-gray-600"
+            textClass="text-gray-700"
+          >
+            카테고리에 추가하기
+          </IconEntryButton>
+        </div>
       </div>
     </div>
-  </div>
-</FullscreenDiv>
+  </FullscreenDiv>
 
-<AddToCategoryBottomSheet
-  bind:isOpen={isAddToCategoryBottomSheetOpen}
-  onAddToCategoryClick={addToCategory}
-/>
+  <AddToCategoryBottomSheet
+    bind:isOpen={isAddToCategoryBottomSheetOpen}
+    onAddToCategoryClick={addToCategory}
+  />
+{/if}

src/routes/(fullscreen)/file/[id]/AddToCategoryBottomSheet.svelte

@@ -1,9 +1,8 @@
 <script lang="ts">
-  import type { Writable } from "svelte/store";
   import { BottomDiv, BottomSheet, Button, FullscreenDiv } from "$lib/components/atoms";
   import { SubCategories } from "$lib/components/molecules";
   import { CategoryCreateModal } from "$lib/components/organisms";
-  import { getCategoryInfo, type CategoryInfo } from "$lib/modules/filesystem";
+  import { getCategoryInfo, type MaybeCategoryInfo } from "$lib/modules/filesystem";
   import { masterKeyStore } from "$lib/stores";
   import { requestCategoryCreation } from "./service";
 
@@ -14,46 +13,48 @@
 
   let { onAddToCategoryClick, isOpen = $bindable() }: Props = $props();
 
-  let category: Writable<CategoryInfo | null> | undefined = $state();
+  let categoryInfoPromise: Promise<MaybeCategoryInfo> | undefined = $state();
 
   let isCategoryCreateModalOpen = $state(false);
 
   $effect(() => {
     if (isOpen) {
-      category = getCategoryInfo("root", $masterKeyStore?.get(1)?.key!);
+      categoryInfoPromise = getCategoryInfo("root", $masterKeyStore?.get(1)?.key!);
     }
   });
 </script>
 
-{#if $category}
-  <BottomSheet bind:isOpen class="flex flex-col">
-    <FullscreenDiv>
-      <SubCategories
-        class="py-4"
-        info={$category}
-        onSubCategoryClick={({ id }) =>
-          (category = getCategoryInfo(id, $masterKeyStore?.get(1)?.key!))}
-        onSubCategoryCreateClick={() => (isCategoryCreateModalOpen = true)}
-        subCategoryCreatePosition="top"
-      />
-      {#if $category.id !== "root"}
-        <BottomDiv>
-          <Button onclick={() => onAddToCategoryClick($category.id)} class="w-full">
-            이 카테고리에 추가하기
-          </Button>
-        </BottomDiv>
-      {/if}
-    </FullscreenDiv>
-  </BottomSheet>
-{/if}
+{#await categoryInfoPromise then categoryInfo}
+  {#if categoryInfo?.exists}
+    <BottomSheet bind:isOpen class="flex flex-col">
+      <FullscreenDiv>
+        <SubCategories
+          class="py-4"
+          info={categoryInfo}
+          onSubCategoryClick={({ id }) =>
+            (categoryInfoPromise = getCategoryInfo(id, $masterKeyStore?.get(1)?.key!))}
+          onSubCategoryCreateClick={() => (isCategoryCreateModalOpen = true)}
+          subCategoryCreatePosition="top"
+        />
+        {#if categoryInfo.id !== "root"}
+          <BottomDiv>
+            <Button onclick={() => onAddToCategoryClick(categoryInfo.id)} class="w-full">
+              이 카테고리에 추가하기
+            </Button>
+          </BottomDiv>
+        {/if}
+      </FullscreenDiv>
+    </BottomSheet>
 
-<CategoryCreateModal
-  bind:isOpen={isCategoryCreateModalOpen}
-  onCreateClick={async (name: string) => {
-    if (await requestCategoryCreation(name, $category!.id, $masterKeyStore?.get(1)!)) {
-      category = getCategoryInfo($category!.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
-      return true;
-    }
-    return false;
-  }}
-/>
+    <CategoryCreateModal
+      bind:isOpen={isCategoryCreateModalOpen}
+      onCreateClick={async (name: string) => {
+        if (await requestCategoryCreation(name, categoryInfo.id, $masterKeyStore?.get(1)!)) {
+          categoryInfoPromise = getCategoryInfo(categoryInfo.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+          return true;
+        }
+        return false;
+      }}
+    />
+  {/if}
+{/await}

src/routes/(fullscreen)/file/[id]/DownloadStatus.svelte

@@ -1,32 +1,31 @@
 <script lang="ts">
-  import type { Writable } from "svelte/store";
-  import { isFileDownloading, type FileDownloadStatus } from "$lib/stores";
+  import { isFileDownloading, type FileDownloadState } from "$lib/modules/file";
   import { formatNetworkSpeed } from "$lib/utils";
 
   interface Props {
-    status?: Writable<FileDownloadStatus>;
+    state: FileDownloadState;
   }
 
-  let { status }: Props = $props();
+  let { state }: Props = $props();
 </script>
 
-{#if $status && isFileDownloading($status.status)}
+{#if isFileDownloading(state.status)}
   <div class="w-full rounded-xl bg-gray-100 p-3">
     <p class="font-medium">
-      {#if $status.status === "download-pending"}
+      {#if state.status === "download-pending"}
         다운로드를 기다리는 중
-      {:else if $status.status === "downloading"}
+      {:else if state.status === "downloading"}
         다운로드하는 중
-      {:else if $status.status === "decryption-pending"}
+      {:else if state.status === "decryption-pending"}
         복호화를 기다리는 중
-      {:else if $status.status === "decrypting"}
+      {:else if state.status === "decrypting"}
         복호화하는 중
       {/if}
     </p>
     <p class="text-xs">
-      {#if $status.status === "downloading"}
+      {#if state.status === "downloading"}
         전송됨
-        {Math.floor(($status.progress ?? 0) * 100)}% · {formatNetworkSpeed(($status.rate ?? 0) * 8)}
+        {Math.floor((state.progress ?? 0) * 100)}% · {formatNetworkSpeed((state.rate ?? 0) * 8)}
       {/if}
     </p>
   </div>

src/routes/(fullscreen)/file/downloads/+page.svelte

@@ -1,19 +1,31 @@
 <script lang="ts">
-  import { get } from "svelte/store";
+  import { onMount } from "svelte";
   import { FullscreenDiv } from "$lib/components/atoms";
   import { TopBar } from "$lib/components/molecules";
-  import { fileDownloadStatusStore, isFileDownloading } from "$lib/stores";
+  import {
+    getDownloadingFiles,
+    clearDownloadedFiles,
+    type FileDownloadState,
+  } from "$lib/modules/file";
+  import { bulkGetFileInfo, type MaybeFileInfo } from "$lib/modules/filesystem";
+  import { masterKeyStore } from "$lib/stores";
   import File from "./File.svelte";
 
-  let downloadingFiles = $derived(
-    $fileDownloadStatusStore.filter((status) => isFileDownloading(get(status).status)),
-  );
+  let downloadingFiles: { info: MaybeFileInfo; state: FileDownloadState }[] = $state([]);
 
-  $effect(() => () => {
-    $fileDownloadStatusStore = $fileDownloadStatusStore.filter((status) =>
-      isFileDownloading(get(status).status),
+  onMount(async () => {
+    const states = getDownloadingFiles();
+    const infos = await bulkGetFileInfo(
+      states.map(({ id }) => id),
+      $masterKeyStore?.get(1)?.key!,
     );
+    downloadingFiles = states.map((state) => ({
+      info: infos.get(state.id)!,
+      state,
+    }));
   });
+
+  $effect(() => clearDownloadedFiles);
 </script>
 
 <svelte:head>
@@ -23,8 +35,10 @@
 <TopBar />
 <FullscreenDiv>
   <div class="space-y-2 pb-4">
-    {#each downloadingFiles as status}
-      <File {status} />
+    {#each downloadingFiles as { info, state } (info.id)}
+      {#if info.exists}
+        <File {info} {state} />
+      {/if}
     {/each}
   </div>
 </FullscreenDiv>

src/routes/(fullscreen)/file/downloads/File.svelte

@@ -1,7 +1,6 @@
 <script lang="ts">
-  import { get, type Writable } from "svelte/store";
-  import { getFileInfo, type FileInfo } from "$lib/modules/filesystem";
-  import { masterKeyStore, type FileDownloadStatus } from "$lib/stores";
+  import type { FileDownloadState } from "$lib/modules/file";
+  import type { SummarizedFileInfo } from "$lib/modules/filesystem";
   import { formatNetworkSpeed } from "$lib/utils";
 
   import IconCloud from "~icons/material-symbols/cloud";
@@ -12,56 +11,49 @@
   import IconError from "~icons/material-symbols/error";
 
   interface Props {
-    status: Writable<FileDownloadStatus>;
+    info: SummarizedFileInfo;
+    state: FileDownloadState;
   }
 
-  let { status }: Props = $props();
-
-  let fileInfo: Writable<FileInfo | null> | undefined = $state();
-
-  $effect(() => {
-    fileInfo = getFileInfo(get(status).id, $masterKeyStore?.get(1)?.key!);
-  });
+  let { info, state }: Props = $props();
 </script>
 
-{#if $fileInfo}
-  <div class="flex h-14 items-center gap-x-4 p-2">
-    <div class="flex-shrink-0 text-lg text-gray-600">
-      {#if $status.status === "download-pending"}
-        <IconCloud />
-      {:else if $status.status === "downloading"}
-        <IconCloudDownload />
-      {:else if $status.status === "decryption-pending"}
-        <IconLock />
-      {:else if $status.status === "decrypting"}
-        <IconLockClock />
-      {:else if $status.status === "decrypted"}
-        <IconCheckCircle class="text-green-500" />
-      {:else if $status.status === "error"}
-        <IconError class="text-red-500" />
-      {/if}
-    </div>
-    <div class="flex-grow overflow-hidden">
-      <p title={$fileInfo.name} class="truncate font-medium">
-        {$fileInfo.name}
-      </p>
-      <p class="text-xs text-gray-800">
-        {#if $status.status === "download-pending"}
-          다운로드를 기다리는 중
-        {:else if $status.status === "downloading"}
-          전송됨
-          {Math.floor(($status.progress ?? 0) * 100)}% ·
-          {formatNetworkSpeed(($status.rate ?? 0) * 8)}
-        {:else if $status.status === "decryption-pending"}
-          복호화를 기다리는 중
-        {:else if $status.status === "decrypting"}
-          복호화하는 중
-        {:else if $status.status === "decrypted"}
-          다운로드 완료
-        {:else if $status.status === "error"}
-          다운로드 실패
-        {/if}
-      </p>
-    </div>
+<div class="flex h-14 items-center gap-x-4 p-2">
+  <div class="flex-shrink-0 text-lg text-gray-600">
+    {#if state.status === "download-pending"}
+      <IconCloud />
+    {:else if state.status === "downloading"}
+      <IconCloudDownload />
+    {:else if state.status === "decryption-pending"}
+      <IconLock />
+    {:else if state.status === "decrypting"}
+      <IconLockClock />
+    {:else if state.status === "decrypted"}
+      <IconCheckCircle class="text-green-500" />
+    {:else if state.status === "error"}
+      <IconError class="text-red-500" />
+    {/if}
   </div>
-{/if}
+  <div class="flex-grow overflow-hidden">
+    <p title={info.name} class="truncate font-medium">
+      {info.name}
+    </p>
+    <p class="text-xs text-gray-800">
+      {#if state.status === "download-pending"}
+        다운로드를 기다리는 중
+      {:else if state.status === "downloading"}
+        전송됨
+        {Math.floor((state.progress ?? 0) * 100)}% ·
+        {formatNetworkSpeed((state.rate ?? 0) * 8)}
+      {:else if state.status === "decryption-pending"}
+        복호화를 기다리는 중
+      {:else if state.status === "decrypting"}
+        복호화하는 중
+      {:else if state.status === "decrypted"}
+        다운로드 완료
+      {:else if state.status === "error"}
+        다운로드 실패
+      {/if}
+    </p>
+  </div>
+</div>

src/routes/(fullscreen)/file/uploads/+page.svelte

@@ -1,19 +1,12 @@
 <script lang="ts">
-  import { get } from "svelte/store";
   import { FullscreenDiv } from "$lib/components/atoms";
   import { TopBar } from "$lib/components/molecules";
-  import { fileUploadStatusStore, isFileUploading } from "$lib/stores";
+  import { getUploadingFiles, clearUploadedFiles } from "$lib/modules/file";
   import File from "./File.svelte";
 
-  let uploadingFiles = $derived(
-    $fileUploadStatusStore.filter((status) => isFileUploading(get(status).status)),
-  );
+  const uploadingFiles = getUploadingFiles();
 
-  $effect(() => () => {
-    $fileUploadStatusStore = $fileUploadStatusStore.filter((status) =>
-      isFileUploading(get(status).status),
-    );
-  });
+  $effect(() => clearUploadedFiles);
 </script>
 
 <svelte:head>
@@ -23,8 +16,8 @@
 <TopBar />
 <FullscreenDiv>
   <div class="space-y-2 pb-4">
-    {#each uploadingFiles as status}
-      <File {status} />
+    {#each uploadingFiles as file}
+      <File state={file} />
     {/each}
   </div>
 </FullscreenDiv>

src/routes/(fullscreen)/file/uploads/File.svelte

@@ -1,6 +1,5 @@
 <script lang="ts">
-  import type { Writable } from "svelte/store";
-  import type { FileUploadStatus } from "$lib/stores";
+  import type { FileUploadState } from "$lib/modules/file";
   import { formatNetworkSpeed } from "$lib/utils";
 
   import IconPending from "~icons/material-symbols/pending";
@@ -11,45 +10,47 @@
   import IconError from "~icons/material-symbols/error";
 
   interface Props {
-    status: Writable<FileUploadStatus>;
+    state: FileUploadState;
   }
 
-  let { status }: Props = $props();
+  let { state }: Props = $props();
 </script>
 
 <div class="flex h-14 items-center gap-x-4 p-2">
   <div class="flex-shrink-0 text-lg text-gray-600">
-    {#if $status.status === "encryption-pending"}
+    {#if state.status === "queued" || state.status === "encryption-pending"}
       <IconPending />
-    {:else if $status.status === "encrypting"}
+    {:else if state.status === "encrypting"}
       <IconLockClock />
-    {:else if $status.status === "upload-pending"}
+    {:else if state.status === "upload-pending"}
       <IconCloud />
-    {:else if $status.status === "uploading"}
+    {:else if state.status === "uploading"}
       <IconCloudUpload />
-    {:else if $status.status === "uploaded"}
+    {:else if state.status === "uploaded"}
       <IconCloudDone class="text-blue-500" />
-    {:else if $status.status === "error"}
+    {:else if state.status === "error"}
       <IconError class="text-red-500" />
     {/if}
   </div>
   <div class="flex-grow overflow-hidden">
-    <p title={$status.name} class="truncate font-medium">
-      {$status.name}
+    <p title={state.name} class="truncate font-medium">
+      {state.name}
     </p>
     <p class="text-xs text-gray-800">
-      {#if $status.status === "encryption-pending"}
+      {#if state.status === "queued"}
+        대기 중
+      {:else if state.status === "encryption-pending"}
         준비 중
-      {:else if $status.status === "encrypting"}
+      {:else if state.status === "encrypting"}
         암호화하는 중
-      {:else if $status.status === "upload-pending"}
+      {:else if state.status === "upload-pending"}
         업로드를 기다리는 중
-      {:else if $status.status === "uploading"}
+      {:else if state.status === "uploading"}
         전송됨
-        {Math.floor(($status.progress ?? 0) * 100)}% · {formatNetworkSpeed(($status.rate ?? 0) * 8)}
-      {:else if $status.status === "uploaded"}
+        {Math.floor((state.progress ?? 0) * 100)}% · {formatNetworkSpeed((state.rate ?? 0) * 8)}
+      {:else if state.status === "uploaded"}
         업로드 완료
-      {:else if $status.status === "error"}
+      {:else if state.status === "error"}
         업로드 실패
       {/if}
     </p>

src/routes/(fullscreen)/gallery/+page.server.ts

@@ -0,0 +1,7 @@
+import { createCaller } from "$trpc/router.server";
+import type { PageServerLoad } from "./$types";
+
+export const load: PageServerLoad = async (event) => {
+  const files = await createCaller(event).file.list();
+  return { files };
+};

src/routes/(fullscreen)/gallery/+page.svelte

@@ -1,18 +1,18 @@
 <script lang="ts">
-  import type { Writable } from "svelte/store";
+  import { onMount } from "svelte";
   import { goto } from "$app/navigation";
   import { FullscreenDiv } from "$lib/components/atoms";
   import { TopBar } from "$lib/components/molecules";
   import { Gallery } from "$lib/components/organisms";
-  import { getFileInfo, type FileInfo } from "$lib/modules/filesystem";
+  import { bulkGetFileInfo, type MaybeFileInfo } from "$lib/modules/filesystem";
   import { masterKeyStore } from "$lib/stores";
 
   let { data } = $props();
 
-  let files: Writable<FileInfo | null>[] = $state([]);
+  let files: MaybeFileInfo[] = $state([]);
 
-  $effect(() => {
-    files = data.files.map((file) => getFileInfo(file, $masterKeyStore?.get(1)?.key!));
+  onMount(async () => {
+    files = Array.from((await bulkGetFileInfo(data.files, $masterKeyStore?.get(1)?.key!)).values());
   });
 </script>
 
@@ -22,5 +22,8 @@
 
 <TopBar title="사진 및 동영상" />
 <FullscreenDiv>
-  <Gallery {files} onFileClick={({ id }) => goto(`/file/${id}`)} />
+  <Gallery
+    files={files.filter((file) => file?.exists)}
+    onFileClick={({ id }) => goto(`/file/${id}?from=gallery`)}
+  />
 </FullscreenDiv>

src/routes/(fullscreen)/gallery/+page.ts

@@ -1,7 +0,0 @@
-import { trpc } from "$trpc/client";
-import type { PageLoad } from "./$types";
-
-export const load: PageLoad = async ({ fetch }) => {
-  const files = await trpc(fetch).file.list.query();
-  return { files };
-};

src/routes/(fullscreen)/settings/cache/+page.svelte

@@ -1,42 +1,39 @@
 <script lang="ts">
   import { onMount } from "svelte";
-  import type { Writable } from "svelte/store";
   import { FullscreenDiv } from "$lib/components/atoms";
   import { TopBar } from "$lib/components/molecules";
   import type { FileCacheIndex } from "$lib/indexedDB";
   import { getFileCacheIndex, deleteFileCache as doDeleteFileCache } from "$lib/modules/file";
-  import { getFileInfo, type FileInfo } from "$lib/modules/filesystem";
+  import { bulkGetFileInfo, type MaybeFileInfo } from "$lib/modules/filesystem";
   import { masterKeyStore } from "$lib/stores";
   import { formatFileSize } from "$lib/utils";
   import File from "./File.svelte";
 
   interface FileCache {
     index: FileCacheIndex;
-    fileInfo: Writable<FileInfo | null>;
+    info: MaybeFileInfo;
   }
 
   let fileCache: FileCache[] | undefined = $state();
-  let fileCacheTotalSize = $state(0);
+  let fileCacheTotalSize = $derived(
+    fileCache?.reduce((acc, { index }) => acc + index.size, 0) ?? 0,
+  );
 
   const deleteFileCache = async (fileId: number) => {
     await doDeleteFileCache(fileId);
     fileCache = fileCache?.filter(({ index }) => index.fileId !== fileId);
   };
 
-  onMount(() => {
-    fileCache = getFileCacheIndex()
-      .map((index) => ({
-        index,
-        fileInfo: getFileInfo(index.fileId, $masterKeyStore?.get(1)?.key!),
-      }))
+  onMount(async () => {
+    const indexes = getFileCacheIndex();
+    const infos = await bulkGetFileInfo(
+      indexes.map(({ fileId }) => fileId),
+      $masterKeyStore?.get(1)?.key!,
+    );
+    fileCache = indexes
+      .map((index) => ({ index, info: infos.get(index.fileId)! }))
       .sort((a, b) => a.index.lastRetrievedAt.getTime() - b.index.lastRetrievedAt.getTime());
   });
-
-  $effect(() => {
-    if (fileCache) {
-      fileCacheTotalSize = fileCache.reduce((acc, { index }) => acc + index.size, 0);
-    }
-  });
 </script>
 
 <svelte:head>
@@ -55,8 +52,8 @@
         <p>캐시를 삭제하더라도 원본 파일은 삭제되지 않아요.</p>
       </div>
       <div class="space-y-2">
-        {#each fileCache as { index, fileInfo }}
-          <File {index} info={fileInfo} onDeleteClick={deleteFileCache} />
+        {#each fileCache as { index, info } (info.id)}
+          <File {index} {info} onDeleteClick={deleteFileCache} />
         {/each}
       </div>
     </div>

src/routes/(fullscreen)/settings/cache/File.svelte

@@ -1,7 +1,6 @@
 <script lang="ts">
-  import type { Writable } from "svelte/store";
   import type { FileCacheIndex } from "$lib/indexedDB";
-  import type { FileInfo } from "$lib/modules/filesystem";
+  import type { MaybeFileInfo } from "$lib/modules/filesystem";
   import { formatDate, formatFileSize } from "$lib/utils";
 
   import IconDraft from "~icons/material-symbols/draft";
@@ -10,7 +9,7 @@
 
   interface Props {
     index: FileCacheIndex;
-    info: Writable<FileInfo | null>;
+    info: MaybeFileInfo;
     onDeleteClick: (fileId: number) => void;
   }
 
@@ -18,7 +17,7 @@
 </script>
 
 <div class="flex h-14 items-center gap-x-4 p-2">
-  {#if $info}
+  {#if info.exists}
     <div class="flex-shrink-0 rounded-full bg-blue-100 p-1 text-xl">
       <IconDraft class="text-blue-400" />
     </div>
@@ -28,8 +27,8 @@
     </div>
   {/if}
   <div class="flex-grow overflow-hidden">
-    {#if $info}
-      <p title={$info.name} class="truncate font-medium">{$info.name}</p>
+    {#if info.exists}
+      <p title={info.name} class="truncate font-medium">{info.name}</p>
     {:else}
       <p class="font-medium">삭제된 파일</p>
     {/if}

src/routes/(fullscreen)/settings/thumbnail/+page.server.ts

@@ -0,0 +1,7 @@
+import { createCaller } from "$trpc/router.server";
+import type { PageServerLoad } from "./$types";
+
+export const load: PageServerLoad = async (event) => {
+  const files = await createCaller(event).file.listWithoutThumbnail();
+  return { files };
+};

src/routes/(fullscreen)/settings/thumbnail/+page.svelte

@@ -1,39 +1,52 @@
 <script lang="ts">
   import { onMount } from "svelte";
-  import { get } from "svelte/store";
   import { goto } from "$app/navigation";
   import { BottomDiv, Button, FullscreenDiv } from "$lib/components/atoms";
   import { IconEntryButton, TopBar } from "$lib/components/molecules";
   import { deleteAllFileThumbnailCaches } from "$lib/modules/file";
-  import { getFileInfo } from "$lib/modules/filesystem";
+  import { bulkGetFileInfo, type MaybeFileInfo } from "$lib/modules/filesystem";
   import { masterKeyStore } from "$lib/stores";
+  import { sortEntries } from "$lib/utils";
   import File from "./File.svelte";
   import {
-    persistentStates,
-    getGenerationStatus,
+    getThumbnailGenerationStatus,
+    clearThumbnailGenerationStatuses,
     requestThumbnailGeneration,
+    type GenerationStatus,
   } from "./service.svelte";
 
   import IconDelete from "~icons/material-symbols/delete";
 
   let { data } = $props();
 
+  let fileInfos: MaybeFileInfo[] = $state([]);
+  let files = $derived(
+    fileInfos
+      .map((info) => ({
+        info,
+        status: getThumbnailGenerationStatus(info.id),
+      }))
+      .filter(
+        (file): file is { info: MaybeFileInfo; status: Exclude<GenerationStatus, "uploaded"> } =>
+          file.status !== "uploaded",
+      ),
+  );
+
   const generateAllThumbnails = () => {
-    persistentStates.files.forEach(({ info }) => {
-      const fileInfo = get(info);
-      if (fileInfo) {
-        requestThumbnailGeneration(fileInfo);
+    files.forEach(({ info }) => {
+      if (info.exists) {
+        requestThumbnailGeneration(info);
       }
     });
   };
 
-  onMount(() => {
-    persistentStates.files = data.files.map((fileId) => ({
-      id: fileId,
-      info: getFileInfo(fileId, $masterKeyStore?.get(1)?.key!),
-      status: getGenerationStatus(fileId),
-    }));
+  onMount(async () => {
+    fileInfos = sortEntries(
+      Array.from((await bulkGetFileInfo(data.files, $masterKeyStore?.get(1)?.key!)).values()),
+    );
   });
+
+  $effect(() => clearThumbnailGenerationStatuses);
 </script>
 
 <svelte:head>
@@ -48,28 +61,30 @@
         저장된 썸네일 모두 삭제하기
       </IconEntryButton>
     </div>
-    {#if persistentStates.files.length > 0}
+    {#if files.length > 0}
       <div class="flex-grow space-y-2 bg-white p-4">
         <p class="text-lg font-bold text-gray-800">썸네일이 누락된 파일</p>
         <div class="space-y-4">
           <p class="break-keep text-gray-800">
-            {persistentStates.files.length}개 파일의 썸네일이 존재하지 않아요.
+            {files.length}개 파일의 썸네일이 존재하지 않아요.
           </p>
           <div class="space-y-2">
-            {#each persistentStates.files as { info, status }}
-              <File
-                {info}
-                generationStatus={status}
-                onclick={({ id }) => goto(`/file/${id}`)}
-                onGenerateThumbnailClick={requestThumbnailGeneration}
-              />
+            {#each files as { info, status } (info.id)}
+              {#if info.exists}
+                <File
+                  {info}
+                  {status}
+                  onclick={({ id }) => goto(`/file/${id}`)}
+                  onGenerateThumbnailClick={requestThumbnailGeneration}
+                />
+              {/if}
             {/each}
           </div>
         </div>
       </div>
     {/if}
   </div>
-  {#if persistentStates.files.length > 0}
+  {#if files.length > 0}
     <BottomDiv class="px-4">
       <Button onclick={generateAllThumbnails} class="w-full">모두 썸네일 생성하기</Button>
     </BottomDiv>

src/routes/(fullscreen)/settings/thumbnail/+page.ts

@@ -1,7 +0,0 @@
-import { trpc } from "$trpc/client";
-import type { PageLoad } from "./$types";
-
-export const load: PageLoad = async ({ fetch }) => {
-  const files = await trpc(fetch).file.listWithoutThumbnail.query();
-  return { files };
-};

src/routes/(fullscreen)/settings/thumbnail/File.svelte

@@ -10,7 +10,6 @@
 </script>
 
 <script lang="ts">
-  import type { Writable } from "svelte/store";
   import { ActionEntryButton } from "$lib/components/atoms";
   import { DirectoryEntryLabel } from "$lib/components/molecules";
   import type { FileInfo } from "$lib/modules/filesystem";
@@ -20,27 +19,24 @@
   import IconCamera from "~icons/material-symbols/camera";
 
   interface Props {
-    info: Writable<FileInfo | null>;
-    onclick: (selectedFile: FileInfo) => void;
-    onGenerateThumbnailClick: (selectedFile: FileInfo) => void;
-    generationStatus?: Writable<GenerationStatus>;
+    info: FileInfo;
+    onclick: (file: FileInfo) => void;
+    onGenerateThumbnailClick: (file: FileInfo) => void;
+    status: Exclude<GenerationStatus, "uploaded"> | undefined;
   }
 
-  let { info, onclick, onGenerateThumbnailClick, generationStatus }: Props = $props();
+  let { info, onclick, onGenerateThumbnailClick, status }: Props = $props();
 </script>
 
-{#if $info}
-  <ActionEntryButton
-    class="h-14"
-    onclick={() => onclick($info)}
-    actionButtonIcon={!$generationStatus || $generationStatus === "error" ? IconCamera : undefined}
-    onActionButtonClick={() => onGenerateThumbnailClick($info)}
-    actionButtonClass="text-gray-800"
-  >
-    {@const subtext =
-      $generationStatus && $generationStatus !== "uploaded"
-        ? subtexts[$generationStatus]
-        : formatDateTime($info.createdAt ?? $info.lastModifiedAt)}
-    <DirectoryEntryLabel type="file" name={$info.name} {subtext} />
-  </ActionEntryButton>
-{/if}
+<ActionEntryButton
+  class="h-14"
+  onclick={() => onclick(info)}
+  actionButtonIcon={!status || status === "error" ? IconCamera : undefined}
+  onActionButtonClick={() => onGenerateThumbnailClick(info)}
+  actionButtonClass="text-gray-800"
+>
+  {@const subtext = status
+    ? subtexts[status]
+    : formatDateTime(info.createdAt ?? info.lastModifiedAt)}
+  <DirectoryEntryLabel type="file" name={info.name} {subtext} />
+</ActionEntryButton>

src/routes/(fullscreen)/settings/thumbnail/service.svelte.ts

@@ -1,8 +1,9 @@
 import { limitFunction } from "p-limit";
-import { get, writable, type Writable } from "svelte/store";
+import { SvelteMap } from "svelte/reactivity";
 import { encryptData } from "$lib/modules/crypto";
 import { storeFileThumbnailCache } from "$lib/modules/file";
 import type { FileInfo } from "$lib/modules/filesystem";
+import { Scheduler } from "$lib/modules/scheduler";
 import { generateThumbnail as doGenerateThumbnail } from "$lib/modules/thumbnail";
 import { requestFileDownload, requestFileThumbnailUpload } from "$lib/services/file";
 
@@ -15,41 +16,31 @@ export type GenerationStatus =
   | "uploaded"
   | "error";
 
-interface File {
-  id: number;
-  info: Writable<FileInfo | null>;
-  status?: Writable<GenerationStatus>;
-}
+const scheduler = new Scheduler();
+const statuses = new SvelteMap<number, GenerationStatus>();
 
-const workingFiles = new Map<number, Writable<GenerationStatus>>();
+export const getThumbnailGenerationStatus = (fileId: number) => {
+  return statuses.get(fileId);
+};
 
-let queue: (() => void)[] = [];
-let memoryUsage = 0;
-const memoryLimit = 100 * 1024 * 1024; // 100 MiB
-
-export const persistentStates = $state({
-  files: [] as File[],
-});
-
-export const getGenerationStatus = (fileId: number) => {
-  return workingFiles.get(fileId);
+export const clearThumbnailGenerationStatuses = () => {
+  for (const [id, status] of statuses) {
+    if (status === "uploaded" || status === "error") {
+      statuses.delete(id);
+    }
+  }
 };
 
 const generateThumbnail = limitFunction(
-  async (
-    status: Writable<GenerationStatus>,
-    fileBuffer: ArrayBuffer,
-    fileType: string,
-    dataKey: CryptoKey,
-  ) => {
-    status.set("generating");
+  async (fileId: number, fileBuffer: ArrayBuffer, fileType: string, dataKey: CryptoKey) => {
+    statuses.set(fileId, "generating");
 
     const thumbnail = await doGenerateThumbnail(fileBuffer, fileType);
     if (!thumbnail) return null;
 
     const thumbnailBuffer = await thumbnail.arrayBuffer();
     const thumbnailEncrypted = await encryptData(thumbnailBuffer, dataKey);
-    status.set("upload-pending");
+    statuses.set(fileId, "upload-pending");
     return { plaintext: thumbnailBuffer, ...thumbnailEncrypted };
   },
   { concurrency: 4 },
@@ -57,102 +48,55 @@ const generateThumbnail = limitFunction(
 
 const requestThumbnailUpload = limitFunction(
   async (
-    status: Writable<GenerationStatus>,
     fileId: number,
     dataKeyVersion: Date,
     thumbnail: { plaintext: ArrayBuffer; ciphertext: ArrayBuffer; iv: string },
   ) => {
-    status.set("uploading");
+    statuses.set(fileId, "uploading");
 
     const res = await requestFileThumbnailUpload(fileId, dataKeyVersion, thumbnail);
     if (!res.ok) return false;
-
-    status.set("uploaded");
-    workingFiles.delete(fileId);
-    persistentStates.files = persistentStates.files.filter(({ id }) => id != fileId);
-
+    statuses.set(fileId, "uploaded");
     storeFileThumbnailCache(fileId, thumbnail.plaintext); // Intended
     return true;
   },
   { concurrency: 4 },
 );
 
-const enqueue = async (
-  status: Writable<GenerationStatus> | undefined,
-  fileInfo: FileInfo,
-  priority = false,
-) => {
-  if (status) {
-    status.set("queued");
-  } else {
-    status = writable("queued");
-    workingFiles.set(fileInfo.id, status);
-    persistentStates.files = persistentStates.files.map((file) =>
-      file.id === fileInfo.id ? { ...file, status } : file,
-    );
-  }
-
-  let resolver;
-  const promise = new Promise((resolve) => {
-    resolver = resolve;
-  });
-
-  if (priority) {
-    queue = [resolver!, ...queue];
-  } else {
-    queue.push(resolver!);
-  }
-
-  await promise;
-};
-
 export const requestThumbnailGeneration = async (fileInfo: FileInfo) => {
-  let status = workingFiles.get(fileInfo.id);
-  if (status && get(status) !== "error") return;
-
-  if (workingFiles.values().some((status) => get(status) !== "error")) {
-    await enqueue(status, fileInfo);
-  }
-  while (memoryUsage >= memoryLimit) {
-    await enqueue(status, fileInfo, true);
-  }
-
+  const status = statuses.get(fileInfo.id);
   if (status) {
-    status.set("generation-pending");
+    if (status !== "error") return;
   } else {
-    status = writable("generation-pending");
-    workingFiles.set(fileInfo.id, status);
-    persistentStates.files = persistentStates.files.map((file) =>
-      file.id === fileInfo.id ? { ...file, status } : file,
-    );
+    statuses.set(fileInfo.id, "queued");
   }
 
-  let fileSize = 0;
   try {
-    const file = await requestFileDownload(fileInfo.id, fileInfo.contentIv!, fileInfo.dataKey!);
-    fileSize = file.byteLength;
+    let file: ArrayBuffer | undefined;
 
-    memoryUsage += fileSize;
-    if (memoryUsage < memoryLimit) {
-      queue.shift()?.();
-    }
-
-    const thumbnail = await generateThumbnail(
-      status,
-      file,
-      fileInfo.contentType,
-      fileInfo.dataKey!,
+    await scheduler.schedule(
+      async () => {
+        statuses.set(fileInfo.id, "generation-pending");
+        file = await requestFileDownload(fileInfo.id, fileInfo.contentIv!, fileInfo.dataKey?.key!);
+        return file.byteLength;
+      },
+      async () => {
+        const thumbnail = await generateThumbnail(
+          fileInfo.id,
+          file!,
+          fileInfo.contentType,
+          fileInfo.dataKey?.key!,
+        );
+        if (
+          !thumbnail ||
+          !(await requestThumbnailUpload(fileInfo.id, fileInfo.dataKey?.version!, thumbnail))
+        ) {
+          statuses.set(fileInfo.id, "error");
+        }
+      },
     );
-    if (
-      !thumbnail ||
-      !(await requestThumbnailUpload(status, fileInfo.id, fileInfo.dataKeyVersion!, thumbnail))
-    ) {
-      status.set("error");
-    }
-  } catch {
-    status.set("error");
-  } finally {
-    memoryUsage -= fileSize;
-    queue.shift()?.();
+  } catch (e) {
+    statuses.set(fileInfo.id, "error");
+    throw e;
   }
 };

src/routes/(main)/category/[[id]]/+page.svelte

@@ -1,9 +1,8 @@
 <script lang="ts">
-  import type { Writable } from "svelte/store";
   import { goto } from "$app/navigation";
   import { TopBar } from "$lib/components/molecules";
   import { Category, CategoryCreateModal } from "$lib/components/organisms";
-  import { getCategoryInfo, updateCategoryInfo, type CategoryInfo } from "$lib/modules/filesystem";
+  import { getCategoryInfo, type MaybeCategoryInfo } from "$lib/modules/filesystem";
   import { masterKeyStore } from "$lib/stores";
   import CategoryDeleteModal from "./CategoryDeleteModal.svelte";
   import CategoryMenuBottomSheet from "./CategoryMenuBottomSheet.svelte";
@@ -19,9 +18,7 @@
   let { data } = $props();
   let context = createContext();
 
-  let info: Writable<CategoryInfo | null> | undefined = $state();
-
-  let isFileRecursive: boolean | undefined = $state();
+  let infoPromise: Promise<MaybeCategoryInfo> | undefined = $state();
 
   let isCategoryCreateModalOpen = $state(false);
   let isCategoryMenuBottomSheetOpen = $state(false);
@@ -29,20 +26,7 @@
   let isCategoryDeleteModalOpen = $state(false);
 
   $effect(() => {
-    info = getCategoryInfo(data.id, $masterKeyStore?.get(1)?.key!);
-    isFileRecursive = undefined;
-  });
-
-  $effect(() => {
-    if ($info && isFileRecursive === undefined) {
-      isFileRecursive = $info.isFileRecursive ?? false;
-    }
-  });
-
-  $effect(() => {
-    if (data.id !== "root" && $info?.isFileRecursive !== isFileRecursive) {
-      updateCategoryInfo(data.id as number, { isFileRecursive });
-    }
+    infoPromise = getCategoryInfo(data.id, $masterKeyStore?.get(1)?.key!);
   });
 </script>
 
@@ -50,68 +34,70 @@
   <title>카테고리</title>
 </svelte:head>
 
-{#if data.id !== "root"}
-  <TopBar title={$info?.name} />
-{/if}
-<div class="min-h-full bg-gray-100 pb-[5.5em]">
-  {#if $info && isFileRecursive !== undefined}
-    <Category
-      bind:isFileRecursive
-      info={$info}
-      onFileClick={({ id }) => goto(`/file/${id}?from=category`)}
-      onFileRemoveClick={async ({ id }) => {
-        await requestFileRemovalFromCategory(id, data.id as number);
-        info = getCategoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+{#await infoPromise then info}
+  {#if info?.exists}
+    {#if info.id !== "root"}
+      <TopBar title={info.name} />
+    {/if}
+    <div class="min-h-full bg-gray-100 pb-[5.5em]">
+      <Category
+        bind:isFileRecursive={info.isFileRecursive}
+        {info}
+        onFileClick={({ id }) => goto(`/file/${id}?from=category`)}
+        onFileRemoveClick={async ({ id }) => {
+          await requestFileRemovalFromCategory(id, data.id as number);
+          infoPromise = getCategoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+        }}
+        onSubCategoryClick={({ id }) => goto(`/category/${id}`)}
+        onSubCategoryCreateClick={() => (isCategoryCreateModalOpen = true)}
+        onSubCategoryMenuClick={(subCategory) => {
+          context.selectedCategory = subCategory;
+          isCategoryMenuBottomSheetOpen = true;
+        }}
+      />
+    </div>
+
+    <CategoryCreateModal
+      bind:isOpen={isCategoryCreateModalOpen}
+      onCreateClick={async (name: string) => {
+        if (await requestCategoryCreation(name, data.id, $masterKeyStore?.get(1)!)) {
+          infoPromise = getCategoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+          return true;
+        }
+        return false;
       }}
-      onSubCategoryClick={({ id }) => goto(`/category/${id}`)}
-      onSubCategoryCreateClick={() => (isCategoryCreateModalOpen = true)}
-      onSubCategoryMenuClick={(subCategory) => {
-        context.selectedCategory = subCategory;
-        isCategoryMenuBottomSheetOpen = true;
+    />
+
+    <CategoryMenuBottomSheet
+      bind:isOpen={isCategoryMenuBottomSheetOpen}
+      onRenameClick={() => {
+        isCategoryMenuBottomSheetOpen = false;
+        isCategoryRenameModalOpen = true;
+      }}
+      onDeleteClick={() => {
+        isCategoryMenuBottomSheetOpen = false;
+        isCategoryDeleteModalOpen = true;
+      }}
+    />
+    <CategoryRenameModal
+      bind:isOpen={isCategoryRenameModalOpen}
+      onRenameClick={async (newName: string) => {
+        if (await requestCategoryRename(context.selectedCategory!, newName)) {
+          infoPromise = getCategoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+          return true;
+        }
+        return false;
+      }}
+    />
+    <CategoryDeleteModal
+      bind:isOpen={isCategoryDeleteModalOpen}
+      onDeleteClick={async () => {
+        if (await requestCategoryDeletion(context.selectedCategory!)) {
+          infoPromise = getCategoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+          return true;
+        }
+        return false;
       }}
     />
   {/if}
-</div>
-
-<CategoryCreateModal
-  bind:isOpen={isCategoryCreateModalOpen}
-  onCreateClick={async (name: string) => {
-    if (await requestCategoryCreation(name, data.id, $masterKeyStore?.get(1)!)) {
-      info = getCategoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
-      return true;
-    }
-    return false;
-  }}
-/>
-
-<CategoryMenuBottomSheet
-  bind:isOpen={isCategoryMenuBottomSheetOpen}
-  onRenameClick={() => {
-    isCategoryMenuBottomSheetOpen = false;
-    isCategoryRenameModalOpen = true;
-  }}
-  onDeleteClick={() => {
-    isCategoryMenuBottomSheetOpen = false;
-    isCategoryDeleteModalOpen = true;
-  }}
-/>
-<CategoryRenameModal
-  bind:isOpen={isCategoryRenameModalOpen}
-  onRenameClick={async (newName: string) => {
-    if (await requestCategoryRename(context.selectedCategory!, newName)) {
-      info = getCategoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
-      return true;
-    }
-    return false;
-  }}
-/>
-<CategoryDeleteModal
-  bind:isOpen={isCategoryDeleteModalOpen}
-  onDeleteClick={async () => {
-    if (await requestCategoryDeletion(context.selectedCategory!)) {
-      info = getCategoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
-      return true;
-    }
-    return false;
-  }}
-/>
+{/await}

src/routes/(main)/category/[[id]]/service.svelte.ts

@@ -17,12 +17,17 @@ export const useContext = () => {
 };
 
 export const requestCategoryRename = async (category: SelectedCategory, newName: string) => {
-  const newNameEncrypted = await encryptString(newName, category.dataKey);
+  if (!category.dataKey) {
+    // TODO: Error Handling
+    return false;
+  }
+
+  const newNameEncrypted = await encryptString(newName, category.dataKey.key);
 
   try {
     await trpc().category.rename.mutate({
       id: category.id,
-      dekVersion: category.dataKeyVersion,
+      dekVersion: category.dataKey.version,
       name: newNameEncrypted.ciphertext,
       nameIv: newNameEncrypted.iv,
     });

src/routes/(main)/directory/[[id]]/+page.svelte

@@ -1,11 +1,10 @@
 <script lang="ts">
   import { onMount } from "svelte";
-  import type { Writable } from "svelte/store";
   import { goto } from "$app/navigation";
   import { page } from "$app/state";
   import { FloatingButton } from "$lib/components/atoms";
   import { TopBar } from "$lib/components/molecules";
-  import { getDirectoryInfo, type DirectoryInfo } from "$lib/modules/filesystem";
+  import { getDirectoryInfo, type MaybeDirectoryInfo } from "$lib/modules/filesystem";
   import { masterKeyStore, hmacSecretStore } from "$lib/stores";
   import DirectoryCreateModal from "./DirectoryCreateModal.svelte";
   import DirectoryEntries from "./DirectoryEntries";
@@ -30,7 +29,7 @@
   let { data } = $props();
   let context = createContext();
 
-  let info: Writable<DirectoryInfo | null> | undefined = $state();
+  let infoPromise: Promise<MaybeDirectoryInfo> | undefined = $state();
   let fileInput: HTMLInputElement | undefined = $state();
   let duplicatedFile: File | undefined = $state();
   let resolveForDuplicateFileModal: ((res: boolean) => void) | undefined = $state();
@@ -61,7 +60,7 @@
         .then((res) => {
           if (!res) return;
           // TODO: FIXME
-          info = getDirectoryInfo(data.id, $masterKeyStore?.get(1)?.key!);
+          infoPromise = getDirectoryInfo(data.id, $masterKeyStore?.get(1)?.key!);
         })
         .catch((e: Error) => {
           // TODO: FIXME
@@ -79,7 +78,7 @@
   });
 
   $effect(() => {
-    info = getDirectoryInfo(data.id, $masterKeyStore?.get(1)?.key!);
+    infoPromise = getDirectoryInfo(data.id, $masterKeyStore?.get(1)?.key!);
   });
 </script>
 
@@ -89,106 +88,106 @@
 
 <input bind:this={fileInput} onchange={uploadFile} type="file" multiple class="hidden" />
 
-<div class="flex h-full flex-col">
-  {#if showTopBar}
-    <TopBar title={$info?.name} class="flex-shrink-0" />
-  {/if}
-  {#if $info}
-    <div class={["flex flex-grow flex-col px-4 pb-4", !showTopBar && "pt-4"]}>
-      <div class="flex gap-x-2">
-        <UploadStatusCard onclick={() => goto("/file/uploads")} />
-        <DownloadStatusCard onclick={() => goto("/file/downloads")} />
-      </div>
-      {#key $info}
+{#await infoPromise then info}
+  {#if info?.exists}
+    <div class="flex h-full flex-col">
+      {#if showTopBar}
+        <TopBar title={info.name} class="flex-shrink-0" />
+      {/if}
+      <div class={["flex flex-grow flex-col px-4 pb-4", !showTopBar && "pt-4"]}>
+        <div class="flex gap-x-2">
+          <UploadStatusCard onclick={() => goto("/file/uploads")} />
+          <DownloadStatusCard onclick={() => goto("/file/downloads")} />
+        </div>
         <DirectoryEntries
-          info={$info}
+          {info}
           onEntryClick={({ type, id }) => goto(`/${type}/${id}`)}
           onEntryMenuClick={(entry) => {
             context.selectedEntry = entry;
             isEntryMenuBottomSheetOpen = true;
           }}
-          showParentEntry={isFromFilePage && $info.parentId !== undefined}
+          showParentEntry={isFromFilePage && info.parentId !== undefined}
           onParentClick={() =>
             goto(
-              $info.parentId === "root"
+              info.parentId === "root"
                 ? "/directory?from=file"
-                : `/directory/${$info.parentId}?from=file`,
+                : `/directory/${info.parentId}?from=file`,
             )}
         />
-      {/key}
+      </div>
     </div>
+
+    <FloatingButton
+      icon={IconAdd}
+      onclick={() => {
+        isEntryCreateBottomSheetOpen = true;
+      }}
+      class="bottom-24 right-4"
+    />
+    <EntryCreateBottomSheet
+      bind:isOpen={isEntryCreateBottomSheetOpen}
+      onDirectoryCreateClick={() => {
+        isEntryCreateBottomSheetOpen = false;
+        isDirectoryCreateModalOpen = true;
+      }}
+      onFileUploadClick={() => {
+        isEntryCreateBottomSheetOpen = false;
+        fileInput?.click();
+      }}
+    />
+    <DirectoryCreateModal
+      bind:isOpen={isDirectoryCreateModalOpen}
+      onCreateClick={async (name) => {
+        if (await requestDirectoryCreation(name, data.id, $masterKeyStore?.get(1)!)) {
+          infoPromise = getDirectoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+          return true;
+        }
+        return false;
+      }}
+    />
+    <DuplicateFileModal
+      bind:isOpen={isDuplicateFileModalOpen}
+      file={duplicatedFile}
+      onbeforeclose={() => {
+        resolveForDuplicateFileModal?.(false);
+        isDuplicateFileModalOpen = false;
+      }}
+      onUploadClick={() => {
+        resolveForDuplicateFileModal?.(true);
+        isDuplicateFileModalOpen = false;
+      }}
+    />
+
+    <EntryMenuBottomSheet
+      bind:isOpen={isEntryMenuBottomSheetOpen}
+      onRenameClick={() => {
+        isEntryMenuBottomSheetOpen = false;
+        isEntryRenameModalOpen = true;
+      }}
+      onDeleteClick={() => {
+        isEntryMenuBottomSheetOpen = false;
+        isEntryDeleteModalOpen = true;
+      }}
+    />
+    <EntryRenameModal
+      bind:isOpen={isEntryRenameModalOpen}
+      onRenameClick={async (newName: string) => {
+        if (await requestEntryRename(context.selectedEntry!, newName)) {
+          infoPromise = getDirectoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+          return true;
+        }
+        return false;
+      }}
+    />
+    <EntryDeleteModal
+      bind:isOpen={isEntryDeleteModalOpen}
+      onDeleteClick={async () => {
+        if (await requestEntryDeletion(context.selectedEntry!)) {
+          infoPromise = getDirectoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+          return true;
+        }
+        return false;
+      }}
+    />
   {/if}
-</div>
-
-<FloatingButton
-  icon={IconAdd}
-  onclick={() => {
-    isEntryCreateBottomSheetOpen = true;
-  }}
-  class="bottom-24 right-4"
-/>
-<EntryCreateBottomSheet
-  bind:isOpen={isEntryCreateBottomSheetOpen}
-  onDirectoryCreateClick={() => {
-    isEntryCreateBottomSheetOpen = false;
-    isDirectoryCreateModalOpen = true;
-  }}
-  onFileUploadClick={() => {
-    isEntryCreateBottomSheetOpen = false;
-    fileInput?.click();
-  }}
-/>
-<DirectoryCreateModal
-  bind:isOpen={isDirectoryCreateModalOpen}
-  onCreateClick={async (name) => {
-    if (await requestDirectoryCreation(name, data.id, $masterKeyStore?.get(1)!)) {
-      info = getDirectoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
-      return true;
-    }
-    return false;
-  }}
-/>
-<DuplicateFileModal
-  bind:isOpen={isDuplicateFileModalOpen}
-  file={duplicatedFile}
-  onbeforeclose={() => {
-    resolveForDuplicateFileModal?.(false);
-    isDuplicateFileModalOpen = false;
-  }}
-  onUploadClick={() => {
-    resolveForDuplicateFileModal?.(true);
-    isDuplicateFileModalOpen = false;
-  }}
-/>
-
-<EntryMenuBottomSheet
-  bind:isOpen={isEntryMenuBottomSheetOpen}
-  onRenameClick={() => {
-    isEntryMenuBottomSheetOpen = false;
-    isEntryRenameModalOpen = true;
-  }}
-  onDeleteClick={() => {
-    isEntryMenuBottomSheetOpen = false;
-    isEntryDeleteModalOpen = true;
-  }}
-/>
-<EntryRenameModal
-  bind:isOpen={isEntryRenameModalOpen}
-  onRenameClick={async (newName: string) => {
-    if (await requestEntryRename(context.selectedEntry!, newName)) {
-      info = getDirectoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
-      return true;
-    }
-    return false;
-  }}
-/>
-<EntryDeleteModal
-  bind:isOpen={isEntryDeleteModalOpen}
-  onDeleteClick={async () => {
-    if (await requestEntryDeletion(context.selectedEntry!)) {
-      info = getDirectoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
-      return true;
-    }
-    return false;
-  }}
-/>
+{/await}

src/routes/(main)/directory/[[id]]/DirectoryEntries/DirectoryEntries.svelte

@@ -1,21 +1,9 @@
 <script lang="ts">
-  import { untrack } from "svelte";
-  import { get, type Writable } from "svelte/store";
-  import { ActionEntryButton } from "$lib/components/atoms";
+  import { ActionEntryButton, RowVirtualizer } from "$lib/components/atoms";
   import { DirectoryEntryLabel } from "$lib/components/molecules";
-  import {
-    getDirectoryInfo,
-    getFileInfo,
-    type DirectoryInfo,
-    type FileInfo,
-  } from "$lib/modules/filesystem";
-  import {
-    fileUploadStatusStore,
-    isFileUploading,
-    masterKeyStore,
-    type FileUploadStatus,
-  } from "$lib/stores";
-  import { SortBy, sortEntries } from "$lib/utils";
+  import { getUploadingFiles, type LiveFileUploadState } from "$lib/modules/file";
+  import type { DirectoryInfo } from "$lib/modules/filesystem";
+  import { sortEntries } from "$lib/utils";
   import File from "./File.svelte";
   import SubDirectory from "./SubDirectory.svelte";
   import UploadingFile from "./UploadingFile.svelte";
@@ -27,7 +15,6 @@
     onEntryMenuClick: (entry: SelectedEntry) => void;
     onParentClick?: () => void;
     showParentEntry?: boolean;
-    sortBy?: SortBy;
   }
 
   let {
@@ -36,105 +23,49 @@
     onEntryMenuClick,
     onParentClick,
     showParentEntry = false,
-    sortBy = SortBy.NAME_ASC,
   }: Props = $props();
 
-  interface DirectoryEntry {
-    name?: string;
-    info: Writable<DirectoryInfo | null>;
-  }
+  type Entry =
+    | { type: "parent" }
+    | { type: "directory"; name: string; details: (typeof info.subDirectories)[number] }
+    | { type: "file"; name: string; details: (typeof info.files)[number] }
+    | { type: "uploading-file"; name: string; details: LiveFileUploadState };
 
-  type FileEntry =
-    | {
-        type: "file";
-        name?: string;
-        info: Writable<FileInfo | null>;
-      }
-    | {
-        type: "uploading-file";
-        name: string;
-        info: Writable<FileUploadStatus>;
-      };
+  const toEntry =
+    <T extends Exclude<Entry["type"], "parent">>(type: T) =>
+    (details: Extract<Entry, { type: T }>["details"]) => ({ type, name: details.name, details });
 
-  let subDirectories: DirectoryEntry[] = $state([]);
-  let files: FileEntry[] = $state([]);
-
-  $effect(() => {
-    // TODO: Fix duplicated requests
-
-    subDirectories = info.subDirectoryIds.map((id) => {
-      const info = getDirectoryInfo(id, $masterKeyStore?.get(1)?.key!);
-      return { name: get(info)?.name, info };
-    });
-    files = info.fileIds
-      .map((id): FileEntry => {
-        const info = getFileInfo(id, $masterKeyStore?.get(1)?.key!);
-        return {
-          type: "file",
-          name: get(info)?.name,
-          info,
-        };
-      })
-      .concat(
-        $fileUploadStatusStore
-          .filter((statusStore) => {
-            const { parentId, status } = get(statusStore);
-            return parentId === info.id && isFileUploading(status);
-          })
-          .map((status) => ({
-            type: "uploading-file",
-            name: get(status).name,
-            info: status,
-          })),
-      );
-
-    const sort = () => {
-      sortEntries(subDirectories, sortBy);
-      sortEntries(files, sortBy);
-    };
-    return untrack(() => {
-      sort();
-
-      const unsubscribes = subDirectories
-        .map((subDirectory) =>
-          subDirectory.info.subscribe((value) => {
-            if (subDirectory.name === value?.name) return;
-            subDirectory.name = value?.name;
-            sort();
-          }),
-        )
-        .concat(
-          files.map((file) =>
-            file.info.subscribe((value) => {
-              if (file.name === value?.name) return;
-              file.name = value?.name;
-              sort();
-            }),
-          ),
-        );
-      return () => unsubscribes.forEach((unsubscribe) => unsubscribe());
-    });
-  });
+  let entries = $derived([
+    ...(showParentEntry ? ([{ type: "parent" }] as const) : []),
+    ...sortEntries(info.subDirectories.map(toEntry("directory"))),
+    ...sortEntries([
+      ...info.files.map(toEntry("file")),
+      ...(getUploadingFiles(info.id) as LiveFileUploadState[]).map(toEntry("uploading-file")),
+    ]),
+  ]);
 </script>
 
-{#if subDirectories.length + files.length > 0 || showParentEntry}
-  <div class="space-y-1 pb-[4.5rem]">
-    {#if showParentEntry}
-      <ActionEntryButton class="h-14" onclick={onParentClick}>
-        <DirectoryEntryLabel type="parent-directory" name=".." />
-      </ActionEntryButton>
-    {/if}
-    {#each subDirectories as { info }}
-      <SubDirectory {info} onclick={onEntryClick} onOpenMenuClick={onEntryMenuClick} />
-    {/each}
-    {#each files as file}
-      {#if file.type === "file"}
-        <File info={file.info} onclick={onEntryClick} onOpenMenuClick={onEntryMenuClick} />
+{#if entries.length > 0}
+  <RowVirtualizer count={entries.length} itemHeight={() => 56} itemGap={4} class="pb-[4.5rem]">
+    {#snippet item(index)}
+      {@const entry = entries[index]!}
+      {#if entry.type === "parent"}
+        <ActionEntryButton class="h-14" onclick={onParentClick}>
+          <DirectoryEntryLabel type="parent-directory" name=".." />
+        </ActionEntryButton>
+      {:else if entry.type === "directory"}
+        <SubDirectory
+          info={entry.details}
+          onclick={onEntryClick}
+          onOpenMenuClick={onEntryMenuClick}
+        />
+      {:else if entry.type === "file"}
+        <File info={entry.details} onclick={onEntryClick} onOpenMenuClick={onEntryMenuClick} />
       {:else}
-        <UploadingFile status={file.info} />
+        <UploadingFile state={entry.details} />
       {/if}
-    {/each}
-  </div>
+    {/snippet}
+  </RowVirtualizer>
 {:else}
   <div class="flex flex-grow items-center justify-center">
     <p class="text-gray-500">폴더가 비어 있어요.</p>

src/routes/(main)/directory/[[id]]/DirectoryEntries/File.svelte

@@ -1,66 +1,52 @@
 <script lang="ts">
-  import type { Writable } from "svelte/store";
+  import { browser } from "$app/environment";
   import { ActionEntryButton } from "$lib/components/atoms";
   import { DirectoryEntryLabel } from "$lib/components/molecules";
-  import type { FileInfo } from "$lib/modules/filesystem";
+  import type { SummarizedFileInfo } from "$lib/modules/filesystem";
+  import { requestFileThumbnailDownload } from "$lib/services/file";
   import { formatDateTime } from "$lib/utils";
-  import { requestFileThumbnailDownload } from "./service";
   import type { SelectedEntry } from "../service.svelte";
 
   import IconMoreVert from "~icons/material-symbols/more-vert";
 
   interface Props {
-    info: Writable<FileInfo | null>;
-    onclick: (selectedEntry: SelectedEntry) => void;
-    onOpenMenuClick: (selectedEntry: SelectedEntry) => void;
+    info: SummarizedFileInfo;
+    onclick: (entry: SelectedEntry) => void;
+    onOpenMenuClick: (entry: SelectedEntry) => void;
   }
 
   let { info, onclick, onOpenMenuClick }: Props = $props();
 
-  let thumbnail: string | undefined = $state();
+  let showThumbnail = $derived(
+    browser && (info.contentType.startsWith("image/") || info.contentType.startsWith("video/")),
+  );
+  let thumbnailPromise = $derived(
+    showThumbnail ? requestFileThumbnailDownload(info.id, info.dataKey?.key) : null,
+  );
 
-  const openFile = () => {
-    const { id, dataKey, dataKeyVersion, name } = $info!;
-    if (!dataKey || !dataKeyVersion) return; // TODO: Error handling
-
-    onclick({ type: "file", id, dataKey, dataKeyVersion, name });
+  const action = (callback: typeof onclick) => {
+    callback({ type: "file", id: info.id, dataKey: info.dataKey, name: info.name });
   };
-
-  const openMenu = () => {
-    const { id, dataKey, dataKeyVersion, name } = $info!;
-    if (!dataKey || !dataKeyVersion) return; // TODO: Error handling
-
-    onOpenMenuClick({ type: "file", id, dataKey, dataKeyVersion, name });
-  };
-
-  $effect(() => {
-    if ($info) {
-      requestFileThumbnailDownload($info.id, $info.dataKey)
-        .then((thumbnailUrl) => {
-          thumbnail = thumbnailUrl ?? undefined;
-        })
-        .catch(() => {
-          // TODO: Error Handling
-          thumbnail = undefined;
-        });
-    } else {
-      thumbnail = undefined;
-    }
-  });
 </script>
 
-{#if $info}
-  <ActionEntryButton
-    class="h-14"
-    onclick={openFile}
-    actionButtonIcon={IconMoreVert}
-    onActionButtonClick={openMenu}
-  >
+<ActionEntryButton
+  class="h-14"
+  onclick={() => action(onclick)}
+  actionButtonIcon={IconMoreVert}
+  onActionButtonClick={() => action(onOpenMenuClick)}
+>
+  {#await thumbnailPromise}
     <DirectoryEntryLabel
       type="file"
-      {thumbnail}
-      name={$info.name}
-      subtext={formatDateTime($info.createdAt ?? $info.lastModifiedAt)}
+      name={info.name}
+      subtext={formatDateTime(info.createdAt ?? info.lastModifiedAt)}
     />
-  </ActionEntryButton>
-{/if}
+  {:then thumbnail}
+    <DirectoryEntryLabel
+      type="file"
+      thumbnail={thumbnail ?? undefined}
+      name={info.name}
+      subtext={formatDateTime(info.createdAt ?? info.lastModifiedAt)}
+    />
+  {/await}
+</ActionEntryButton>

src/routes/(main)/directory/[[id]]/DirectoryEntries/SubDirectory.svelte

@@ -1,44 +1,29 @@
 <script lang="ts">
-  import type { Writable } from "svelte/store";
   import { ActionEntryButton } from "$lib/components/atoms";
   import { DirectoryEntryLabel } from "$lib/components/molecules";
-  import type { DirectoryInfo } from "$lib/modules/filesystem";
+  import type { SubDirectoryInfo } from "$lib/modules/filesystem";
   import type { SelectedEntry } from "../service.svelte";
 
   import IconMoreVert from "~icons/material-symbols/more-vert";
 
-  type SubDirectoryInfo = DirectoryInfo & { id: number };
-
   interface Props {
-    info: Writable<DirectoryInfo | null>;
-    onclick: (selectedEntry: SelectedEntry) => void;
-    onOpenMenuClick: (selectedEntry: SelectedEntry) => void;
+    info: SubDirectoryInfo;
+    onclick: (entry: SelectedEntry) => void;
+    onOpenMenuClick: (entry: SelectedEntry) => void;
   }
 
   let { info, onclick, onOpenMenuClick }: Props = $props();
 
-  const openDirectory = () => {
-    const { id, dataKey, dataKeyVersion, name } = $info as SubDirectoryInfo;
-    if (!dataKey || !dataKeyVersion) return; // TODO: Error handling
-
-    onclick({ type: "directory", id, dataKey, dataKeyVersion, name });
-  };
-
-  const openMenu = () => {
-    const { id, dataKey, dataKeyVersion, name } = $info as SubDirectoryInfo;
-    if (!dataKey || !dataKeyVersion) return; // TODO: Error handling
-
-    onOpenMenuClick({ type: "directory", id, dataKey, dataKeyVersion, name });
+  const action = (callback: typeof onclick) => {
+    callback({ type: "directory", id: info.id, dataKey: info.dataKey, name: info.name });
   };
 </script>
 
-{#if $info}
-  <ActionEntryButton
-    class="h-14"
-    onclick={openDirectory}
-    actionButtonIcon={IconMoreVert}
-    onActionButtonClick={openMenu}
-  >
-    <DirectoryEntryLabel type="directory" name={$info.name!} />
-  </ActionEntryButton>
-{/if}
+<ActionEntryButton
+  class="h-14"
+  onclick={() => action(onclick)}
+  actionButtonIcon={IconMoreVert}
+  onActionButtonClick={() => action(onOpenMenuClick)}
+>
+  <DirectoryEntryLabel type="directory" name={info.name} />
+</ActionEntryButton>

src/routes/(main)/directory/[[id]]/DirectoryEntries/UploadingFile.svelte

@@ -1,38 +1,37 @@
 <script lang="ts">
-  import type { Writable } from "svelte/store";
-  import { isFileUploading, type FileUploadStatus } from "$lib/stores";
+  import type { LiveFileUploadState } from "$lib/modules/file";
   import { formatNetworkSpeed } from "$lib/utils";
 
   import IconDraft from "~icons/material-symbols/draft";
 
   interface Props {
-    status: Writable<FileUploadStatus>;
+    state: LiveFileUploadState;
   }
 
-  let { status }: Props = $props();
+  let { state }: Props = $props();
 </script>
 
-{#if isFileUploading($status.status)}
-  <div class="flex h-14 gap-x-4 p-2">
-    <div class="flex h-10 w-10 flex-shrink-0 items-center justify-center text-xl">
-      <IconDraft class="text-gray-600" />
-    </div>
-    <div class="flex flex-grow flex-col overflow-hidden text-gray-800">
-      <p title={$status.name} class="truncate font-medium">
-        {$status.name}
-      </p>
-      <p class="text-xs">
-        {#if $status.status === "encryption-pending"}
-          준비 중
-        {:else if $status.status === "encrypting"}
-          암호화하는 중
-        {:else if $status.status === "upload-pending"}
-          업로드를 기다리는 중
-        {:else if $status.status === "uploading"}
-          전송됨 {Math.floor(($status.progress ?? 0) * 100)}% ·
-          {formatNetworkSpeed(($status.rate ?? 0) * 8)}
-        {/if}
-      </p>
-    </div>
+<div class="flex h-14 gap-x-4 p-2">
+  <div class="flex h-10 w-10 flex-shrink-0 items-center justify-center text-xl">
+    <IconDraft class="text-gray-600" />
   </div>
-{/if}
+  <div class="flex flex-grow flex-col overflow-hidden text-gray-800">
+    <p title={state.name} class="truncate font-medium">
+      {state.name}
+    </p>
+    <p class="text-xs">
+      {#if state.status === "queued"}
+        대기 중
+      {:else if state.status === "encryption-pending"}
+        준비 중
+      {:else if state.status === "encrypting"}
+        암호화하는 중
+      {:else if state.status === "upload-pending"}
+        업로드를 기다리는 중
+      {:else if state.status === "uploading"}
+        전송됨 {Math.floor((state.progress ?? 0) * 100)}% ·
+        {formatNetworkSpeed((state.rate ?? 0) * 8)}
+      {/if}
+    </p>
+  </div>
+</div>

src/routes/(main)/directory/[[id]]/DirectoryEntries/service.ts

@@ -1 +0,0 @@
-export { requestFileThumbnailDownload } from "$lib/services/file";

src/routes/(main)/directory/[[id]]/DownloadStatusCard.svelte

@@ -1,7 +1,5 @@
 <script lang="ts">
-  import { untrack } from "svelte";
-  import { get, type Writable } from "svelte/store";
-  import { fileDownloadStatusStore, isFileDownloading, type FileDownloadStatus } from "$lib/stores";
+  import { getDownloadingFiles } from "$lib/modules/file";
 
   interface Props {
     onclick: () => void;
@@ -9,23 +7,7 @@
 
   let { onclick }: Props = $props();
 
-  let downloadingFiles: Writable<FileDownloadStatus>[] = $state([]);
-
-  $effect(() => {
-    downloadingFiles = $fileDownloadStatusStore.filter((status) =>
-      isFileDownloading(get(status).status),
-    );
-    return untrack(() => {
-      const unsubscribes = downloadingFiles.map((downloadingFile) =>
-        downloadingFile.subscribe(({ status }) => {
-          if (!isFileDownloading(status)) {
-            downloadingFiles = downloadingFiles.filter((file) => file !== downloadingFile);
-          }
-        }),
-      );
-      return () => unsubscribes.forEach((unsubscribe) => unsubscribe());
-    });
-  });
+  let downloadingFiles = $derived(getDownloadingFiles());
 </script>
 
 {#if downloadingFiles.length > 0}

src/routes/(main)/directory/[[id]]/UploadStatusCard.svelte

@@ -1,7 +1,5 @@
 <script lang="ts">
-  import { untrack } from "svelte";
-  import { get, type Writable } from "svelte/store";
-  import { fileUploadStatusStore, isFileUploading, type FileUploadStatus } from "$lib/stores";
+  import { getUploadingFiles } from "$lib/modules/file";
 
   interface Props {
     onclick: () => void;
@@ -9,21 +7,7 @@
 
   let { onclick }: Props = $props();
 
-  let uploadingFiles: Writable<FileUploadStatus>[] = $state([]);
-
-  $effect(() => {
-    uploadingFiles = $fileUploadStatusStore.filter((status) => isFileUploading(get(status).status));
-    return untrack(() => {
-      const unsubscribes = uploadingFiles.map((uploadingFile) =>
-        uploadingFile.subscribe(({ status }) => {
-          if (!isFileUploading(status)) {
-            uploadingFiles = uploadingFiles.filter((file) => file !== uploadingFile);
-          }
-        }),
-      );
-      return () => unsubscribes.forEach((unsubscribe) => unsubscribe());
-    });
-  });
+  let uploadingFiles = $derived(getUploadingFiles());
 </script>
 
 {#if uploadingFiles.length > 0}

src/routes/(main)/directory/[[id]]/service.svelte.ts

@@ -8,14 +8,14 @@ import {
   deleteFileThumbnailCache,
   uploadFile,
 } from "$lib/modules/file";
+import type { DataKey } from "$lib/modules/filesystem";
 import { hmacSecretStore, type MasterKey, type HmacSecret } from "$lib/stores";
 import { trpc } from "$trpc/client";
 
 export interface SelectedEntry {
   type: "directory" | "file";
   id: number;
-  dataKey: CryptoKey;
-  dataKeyVersion: Date;
+  dataKey: DataKey | undefined;
   name: string;
 }
 
@@ -97,20 +97,25 @@ export const requestFileUpload = async (
 };
 
 export const requestEntryRename = async (entry: SelectedEntry, newName: string) => {
-  const newNameEncrypted = await encryptString(newName, entry.dataKey);
+  if (!entry.dataKey) {
+    // TODO: Error Handling
+    return false;
+  }
+
+  const newNameEncrypted = await encryptString(newName, entry.dataKey.key);
 
   try {
     if (entry.type === "directory") {
       await trpc().directory.rename.mutate({
         id: entry.id,
-        dekVersion: entry.dataKeyVersion,
+        dekVersion: entry.dataKey.version,
         name: newNameEncrypted.ciphertext,
         nameIv: newNameEncrypted.iv,
       });
     } else {
       await trpc().file.rename.mutate({
         id: entry.id,
-        dekVersion: entry.dataKeyVersion,
+        dekVersion: entry.dataKey.version,
         name: newNameEncrypted.ciphertext,
         nameIv: newNameEncrypted.iv,
       });

src/routes/(main)/home/+page.svelte

@@ -1,17 +1,23 @@
 <script lang="ts">
-  import type { Writable } from "svelte/store";
+  import { onMount } from "svelte";
   import { goto } from "$app/navigation";
   import { EntryButton, FileThumbnailButton } from "$lib/components/atoms";
-  import { getFileInfo, type FileInfo } from "$lib/modules/filesystem";
+  import { bulkGetFileInfo, type MaybeFileInfo } from "$lib/modules/filesystem";
   import { masterKeyStore } from "$lib/stores";
   import { requestFreshMediaFilesRetrieval } from "./service";
 
-  let mediaFiles: Writable<FileInfo | null>[] = $state([]);
+  let mediaFiles: MaybeFileInfo[] = $state([]);
 
-  $effect(() => {
-    requestFreshMediaFilesRetrieval().then((files) => {
-      mediaFiles = files.map(({ id }) => getFileInfo(id, $masterKeyStore?.get(1)?.key!));
-    });
+  onMount(async () => {
+    const files = await requestFreshMediaFilesRetrieval();
+    mediaFiles = Array.from(
+      (
+        await bulkGetFileInfo(
+          files.map(({ id }) => id),
+          $masterKeyStore?.get(1)?.key!,
+        )
+      ).values(),
+    );
   });
 </script>
 
@@ -21,14 +27,18 @@
 
 <div class="min-h-full space-y-4 bg-gray-100 px-4 pb-[5.5em] pt-4">
   <p class="px-2 text-2xl font-bold text-gray-800">ArkVault</p>
-  <div class="space-y-2 rounded-xl bg-white px-2 pb-4 pt-2">
+  <div class="rounded-xl bg-white p-2">
     <EntryButton onclick={() => goto("/gallery")} class="w-full">
       <p class="text-left font-semibold">사진 및 동영상</p>
     </EntryButton>
-    <div class="grid grid-cols-4 gap-2 px-2">
-      {#each mediaFiles as file}
-        <FileThumbnailButton info={file} onclick={({ id }) => goto(`/file/${id}`)} />
-      {/each}
-    </div>
+    {#if mediaFiles.length > 0}
+      <div class="grid grid-cols-4 gap-2 p-2">
+        {#each mediaFiles as file (file.id)}
+          {#if file.exists}
+            <FileThumbnailButton info={file} onclick={({ id }) => goto(`/file/${id}`)} />
+          {/if}
+        {/each}
+      </div>
+    {/if}
   </div>
 </div>

src/routes/(main)/menu/+page.server.ts

@@ -0,0 +1,7 @@
+import { createCaller } from "$trpc/router.server";
+import type { PageServerLoad } from "./$types";
+
+export const load: PageServerLoad = async (event) => {
+  const { nickname } = await createCaller(event).user.get();
+  return { nickname };
+};

src/routes/(main)/menu/+page.ts

@@ -1,7 +0,0 @@
-import { trpc } from "$trpc/client";
-import type { PageLoad } from "./$types";
-
-export const load: PageLoad = async ({ fetch }) => {
-  const { nickname } = await trpc(fetch).user.get.query();
-  return { nickname };
-};

src/routes/+layout.svelte

@@ -1,24 +1,14 @@
 <script lang="ts">
   import { onMount } from "svelte";
-  import { get } from "svelte/store";
   import { goto as svelteGoto } from "$app/navigation";
-  import {
-    fileUploadStatusStore,
-    fileDownloadStatusStore,
-    isFileUploading,
-    isFileDownloading,
-    clientKeyStore,
-    masterKeyStore,
-  } from "$lib/stores";
+  import { getDownloadingFiles, getUploadingFiles } from "$lib/modules/file";
+  import { clientKeyStore, masterKeyStore } from "$lib/stores";
   import "../app.css";
 
   let { children } = $props();
 
   const protectFileUploadAndDownload = (e: BeforeUnloadEvent) => {
-    if (
-      $fileUploadStatusStore.some((status) => isFileUploading(get(status).status)) ||
-      $fileDownloadStatusStore.some((status) => isFileDownloading(get(status).status))
-    ) {
+    if (getDownloadingFiles().length > 0 || getUploadingFiles().length > 0) {
       e.preventDefault();
     }
   };

src/routes/api/trpc/[trpc]/+server.ts

@@ -6,6 +6,7 @@ import type { RequestHandler } from "./$types";
 const trpcHandler: RequestHandler = (event) =>
   fetchRequestHandler({
     endpoint: "/api/trpc",
+    allowMethodOverride: true,
     req: event.request,
     router: appRouter,
     createContext: () => createContext(event),

src/trpc/client.ts

@@ -1,4 +1,4 @@
-import { createTRPCClient, httpBatchLink } from "@trpc/client";
+import { createTRPCClient, httpBatchLink, TRPCClientError } from "@trpc/client";
 import superjson from "superjson";
 import { browser } from "$app/environment";
 import type { AppRouter } from "./router.server";
@@ -9,6 +9,7 @@ const createClient = (fetch: typeof globalThis.fetch) =>
       httpBatchLink({
         url: "/api/trpc",
         maxURLLength: 4096,
+        methodOverride: "POST",
         transformer: superjson,
         fetch,
       }),
@@ -24,3 +25,7 @@ export const trpc = (fetch = globalThis.fetch) => {
   }
   return client;
 };
+
+export const isTRPCClientError = (e: unknown): e is TRPCClientError<AppRouter> => {
+  return e instanceof TRPCClientError;
+};

src/trpc/routers/category.ts

@@ -9,6 +9,7 @@ const categoryRouter = router({
     .input(
       z.object({
         id: categoryIdSchema,
+        recurse: z.boolean().default(false),
       }),
     )
     .query(async ({ ctx, input }) => {
@@ -20,7 +21,12 @@ const categoryRouter = router({
         throw new TRPCError({ code: "NOT_FOUND", message: "Invalid category id" });
       }
 
-      const categories = await CategoryRepo.getAllCategoriesByParent(ctx.session.userId, input.id);
+      const [categories, files] = await Promise.all([
+        CategoryRepo.getAllCategoriesByParent(ctx.session.userId, input.id),
+        input.id !== "root"
+          ? FileRepo.getAllFilesByCategory(ctx.session.userId, input.id, input.recurse)
+          : undefined,
+      ]);
       return {
         metadata: category && {
           parent: category.parentId,
@@ -30,7 +36,28 @@ const categoryRouter = router({
           name: category.encName.ciphertext,
           nameIv: category.encName.iv,
         },
-        subCategories: categories.map(({ id }) => id),
+        subCategories: categories.map((category) => ({
+          id: category.id,
+          mekVersion: category.mekVersion,
+          dek: category.encDek,
+          dekVersion: category.dekVersion,
+          name: category.encName.ciphertext,
+          nameIv: category.encName.iv,
+        })),
+        files: files?.map((file) => ({
+          id: file.id,
+          mekVersion: file.mekVersion,
+          dek: file.encDek,
+          dekVersion: file.dekVersion,
+          contentType: file.contentType,
+          name: file.encName.ciphertext,
+          nameIv: file.encName.iv,
+          createdAt: file.encCreatedAt?.ciphertext,
+          createdAtIv: file.encCreatedAt?.iv,
+          lastModifiedAt: file.encLastModifiedAt.ciphertext,
+          lastModifiedAtIv: file.encLastModifiedAt.iv,
+          isRecursive: file.isRecursive,
+        })),
       };
     }),
 
@@ -113,27 +140,6 @@ const categoryRouter = router({
       }
     }),
 
-  files: roleProcedure["activeClient"]
-    .input(
-      z.object({
-        id: z.int().positive(),
-        recurse: z.boolean().default(false),
-      }),
-    )
-    .query(async ({ ctx, input }) => {
-      const category = await CategoryRepo.getCategory(ctx.session.userId, input.id);
-      if (!category) {
-        throw new TRPCError({ code: "NOT_FOUND", message: "Invalid category id" });
-      }
-
-      const files = await FileRepo.getAllFilesByCategory(
-        ctx.session.userId,
-        input.id,
-        input.recurse,
-      );
-      return files.map(({ id, isRecursive }) => ({ file: id, isRecursive }));
-    }),
-
   addFile: roleProcedure["activeClient"]
     .input(
       z.object({

src/trpc/routers/directory.ts

@@ -32,8 +32,27 @@ const directoryRouter = router({
           name: directory.encName.ciphertext,
           nameIv: directory.encName.iv,
         },
-        subDirectories: directories.map(({ id }) => id),
-        files: files.map(({ id }) => id),
+        subDirectories: directories.map((directory) => ({
+          id: directory.id,
+          mekVersion: directory.mekVersion,
+          dek: directory.encDek,
+          dekVersion: directory.dekVersion,
+          name: directory.encName.ciphertext,
+          nameIv: directory.encName.iv,
+        })),
+        files: files.map((file) => ({
+          id: file.id,
+          mekVersion: file.mekVersion,
+          dek: file.encDek,
+          dekVersion: file.dekVersion,
+          contentType: file.contentType,
+          name: file.encName.ciphertext,
+          nameIv: file.encName.iv,
+          createdAt: file.encCreatedAt?.ciphertext,
+          createdAtIv: file.encCreatedAt?.iv,
+          lastModifiedAt: file.encLastModifiedAt.ciphertext,
+          lastModifiedAtIv: file.encLastModifiedAt.iv,
+        })),
       };
     }),
 

src/trpc/routers/file.ts

@@ -31,10 +31,50 @@ const fileRouter = router({
         createdAtIv: file.encCreatedAt?.iv,
         lastModifiedAt: file.encLastModifiedAt.ciphertext,
         lastModifiedAtIv: file.encLastModifiedAt.iv,
-        categories: categories.map(({ id }) => id),
+        categories: categories.map((category) => ({
+          id: category.id,
+          mekVersion: category.mekVersion,
+          dek: category.encDek,
+          dekVersion: category.dekVersion,
+          name: category.encName.ciphertext,
+          nameIv: category.encName.iv,
+        })),
       };
     }),
 
+  bulkGet: roleProcedure["activeClient"]
+    .input(
+      z.object({
+        ids: z.number().positive().array(),
+      }),
+    )
+    .query(async ({ ctx, input }) => {
+      const files = await FileRepo.getFilesWithCategories(ctx.session.userId, input.ids);
+      return files.map((file) => ({
+        id: file.id,
+        parent: file.parentId,
+        mekVersion: file.mekVersion,
+        dek: file.encDek,
+        dekVersion: file.dekVersion,
+        contentType: file.contentType,
+        contentIv: file.encContentIv,
+        name: file.encName.ciphertext,
+        nameIv: file.encName.iv,
+        createdAt: file.encCreatedAt?.ciphertext,
+        createdAtIv: file.encCreatedAt?.iv,
+        lastModifiedAt: file.encLastModifiedAt.ciphertext,
+        lastModifiedAtIv: file.encLastModifiedAt.iv,
+        categories: file.categories.map((category) => ({
+          id: category.id,
+          mekVersion: category.mekVersion,
+          dek: category.encDek,
+          dekVersion: category.dekVersion,
+          name: category.encName.ciphertext,
+          nameIv: category.encName.iv,
+        })),
+      }));
+    }),
+
   list: roleProcedure["activeClient"].query(async ({ ctx }) => {
     return await FileRepo.getAllFileIds(ctx.session.userId);
   }),