파일, 카테고리, 디렉터리 정보를 불러올 때 특정 조건에서 네트워크 요청이 여러 번 발생할 수 있는 버그 수정

네트워크 호출 최적화

.dockerignore

@@ -1,5 +1,6 @@
 .git
 node_modules
+/Makefile
 
 # Output
 .output
@@ -10,13 +11,15 @@ node_modules
 /build
 /data
 /library
+/thumbnails
 
 # OS
 .DS_Store
 Thumbs.db
 
-# VSCode
+# Editors
 /.vscode
+/.idea
 
 # Env
 .env
@@ -27,6 +30,3 @@ Thumbs.db
 # Vite
 vite.config.js.timestamp-*
 vite.config.ts.timestamp-*
-
-# SQLite
-*.db

.env.example

@@ -1,9 +1,14 @@
 # Required environment variables
+DATABASE_PASSWORD=
 SESSION_SECRET=
 
 # Optional environment variables
-DATABASE_URL=
+DATABASE_HOST=
+DATABASE_PORT=
+DATABASE_USER=
+DATABASE_NAME=
 SESSION_EXPIRES=
 USER_CLIENT_CHALLENGE_EXPIRES=
 SESSION_UPGRADE_CHALLENGE_EXPIRES=
 LIBRARY_PATH=
+THUMBNAILS_PATH=

.gitignore

@@ -9,13 +9,15 @@ node_modules
 /build
 /data
 /library
+/thumbnails
 
 # OS
 .DS_Store
 Thumbs.db
 
-# VSCode
+# Editors
 /.vscode
+/.idea
 
 # Env
 .env
@@ -26,6 +28,3 @@ Thumbs.db
 # Vite
 vite.config.js.timestamp-*
 vite.config.ts.timestamp-*
-
-# SQLite
-*.db

.prettierignore

@@ -3,8 +3,5 @@ package-lock.json
 pnpm-lock.yaml
 yarn.lock
 
-# Output
-/drizzle
-
 # Documents
 *.md

Dockerfile

@@ -2,7 +2,7 @@
 FROM node:22-alpine AS base
 WORKDIR /app
 
-RUN npm install -g pnpm@9
+RUN npm install -g pnpm@10
 COPY pnpm-lock.yaml .
 
 # Build Stage
@@ -10,8 +10,9 @@ FROM base AS build
 RUN pnpm fetch
 
 COPY . .
-RUN pnpm install --offline
-RUN pnpm build
+RUN pnpm install --offline && \
+    pnpm build && \
+    sed -i "s/http\.createServer()/http.createServer({ requestTimeout: 0 })/g" ./build/index.js
 
 # Deploy Stage
 FROM base
@@ -21,9 +22,7 @@ COPY package.json .
 RUN pnpm install --offline --prod
 
 COPY --from=build /app/build ./build
-COPY drizzle ./drizzle
 
 EXPOSE 3000
 ENV BODY_SIZE_LIMIT=Infinity
-
 CMD ["node", "./build/index.js"]

README.md

@@ -23,7 +23,7 @@ vim .env # 아래를 참고하여 환경 변수를 설정해 주세요.
 docker compose up --build -d
 ```
 
-모든 데이터는 `./data` 디렉터리에 저장될 거예요.
+모든 데이터는 `./data` 디렉터리에 아래에 저장될 거예요.
 
 ### Environment Variables
 
@@ -31,7 +31,8 @@ docker compose up --build -d
 
 |이름|필수|기본값|설명|
 |:-|:-:|:-:|:-|
-|`SESSION_SECRET`|Y||Session ID의 서명을 위해 사용돼요. 안전한 값으로 설정해 주세요.|
+|`DATABASE_PASSWORD`|Y||데이터베이스에 접근하기 위해 필요한 비밀번호예요. 안전한 값으로 설정해 주세요.|
+|`SESSION_SECRET`|Y||Session ID의 서명에 사용되는 비밀번호예요. 안전한 값으로 설정해 주세요.|
 |`SESSION_EXPIRES`||`14d`|Session의 유효 시간이에요. Session은 마지막으로 사용된 후 설정된 유효 시간이 지나면 자동으로 삭제돼요.|
 |`USER_CLIENT_CHALLENGE_EXPIRES`||`5m`|암호 키를 서버에 처음 등록할 때 사용되는 챌린지의 유효 시간이에요.|
 |`SESSION_UPGRADE_CHALLENGE_EXPIRES`||`5m`|암호 키와 함께 로그인할 때 사용되는 챌린지의 유효 시간이에요.|

docker-compose.dev.yaml

@@ -0,0 +1,15 @@
+services:
+  database:
+    image: postgres:17
+    restart: always
+    volumes:
+      - database:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_USER=${DATABASE_USER:-}
+      - POSTGRES_PASSWORD=${DATABASE_PASSWORD:?} # Required
+      - POSTGRES_DB=${DATABASE_NAME:-}
+    ports:
+      - ${DATABASE_PORT:-5432}:5432
+
+volumes:
+  database:

docker-compose.yaml

@@ -2,20 +2,42 @@ services:
   server:
     build: .
     restart: unless-stopped
+    depends_on:
+      database:
+        condition: service_healthy
     user: ${CONTAINER_UID:-0}:${CONTAINER_GID:-0}
     volumes:
-      - ./data:/app/data
+      - ./data/library:/app/data/library
+      - ./data/thumbnails:/app/data/thumbnails
     environment:
       # ArkVault
-      - DATABASE_URL=/app/data/database.sqlite
+      - DATABASE_HOST=database
+      - DATABASE_USER=arkvault
+      - DATABASE_PASSWORD=${DATABASE_PASSWORD:?} # Required
       - SESSION_SECRET=${SESSION_SECRET:?} # Required
       - SESSION_EXPIRES
       - USER_CLIENT_CHALLENGE_EXPIRES
       - SESSION_UPGRADE_CHALLENGE_EXPIRES
       - LIBRARY_PATH=/app/data/library
+      - THUMBNAILS_PATH=/app/data/thumbnails
       # SvelteKit
       - ADDRESS_HEADER=${TRUST_PROXY:+X-Forwarded-For}
       - XFF_DEPTH=${TRUST_PROXY:-}
       - NODE_ENV=${NODE_ENV:-production}
     ports:
       - ${PORT:-80}:3000
+
+  database:
+    image: postgres:17-alpine
+    restart: unless-stopped
+    user: ${CONTAINER_UID:-0}:${CONTAINER_GID:-0}
+    volumes:
+      - ./data/database:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_USER=arkvault
+      - POSTGRES_PASSWORD=${DATABASE_PASSWORD:?}
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U $${POSTGRES_USER}"]
+      interval: 5s
+      timeout: 5s
+      retries: 5

drizzle.config.ts

@@ -1,13 +0,0 @@
-import { defineConfig } from "drizzle-kit";
-
-export default defineConfig({
-  schema: "./src/lib/server/db/schema",
-
-  dbCredentials: {
-    url: process.env.DATABASE_URL || "local.db",
-  },
-
-  verbose: true,
-  strict: true,
-  dialect: "sqlite",
-});

drizzle/0000_unknown_stark_industries.sql

@@ -1,175 +0,0 @@
-CREATE TABLE `client` (
-	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
-	`encryption_public_key` text NOT NULL,
-	`signature_public_key` text NOT NULL
-);
---> statement-breakpoint
-CREATE TABLE `user_client` (
-	`user_id` integer NOT NULL,
-	`client_id` integer NOT NULL,
-	`state` text DEFAULT 'challenging' NOT NULL,
-	PRIMARY KEY(`client_id`, `user_id`),
-	FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`client_id`) REFERENCES `client`(`id`) ON UPDATE no action ON DELETE no action
-);
---> statement-breakpoint
-CREATE TABLE `user_client_challenge` (
-	`id` integer PRIMARY KEY NOT NULL,
-	`user_id` integer NOT NULL,
-	`client_id` integer NOT NULL,
-	`answer` text NOT NULL,
-	`allowed_ip` text NOT NULL,
-	`expires_at` integer NOT NULL,
-	FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`client_id`) REFERENCES `client`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`user_id`,`client_id`) REFERENCES `user_client`(`user_id`,`client_id`) ON UPDATE no action ON DELETE no action
-);
---> statement-breakpoint
-CREATE TABLE `directory` (
-	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
-	`parent_id` integer,
-	`user_id` integer NOT NULL,
-	`master_encryption_key_version` integer NOT NULL,
-	`encrypted_data_encryption_key` text NOT NULL,
-	`data_encryption_key_version` integer NOT NULL,
-	`encrypted_name` text NOT NULL,
-	FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`parent_id`) REFERENCES `directory`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`user_id`,`master_encryption_key_version`) REFERENCES `master_encryption_key`(`user_id`,`version`) ON UPDATE no action ON DELETE no action
-);
---> statement-breakpoint
-CREATE TABLE `directory_log` (
-	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
-	`directory_id` integer NOT NULL,
-	`timestamp` integer NOT NULL,
-	`action` text NOT NULL,
-	`new_name` text,
-	FOREIGN KEY (`directory_id`) REFERENCES `directory`(`id`) ON UPDATE no action ON DELETE cascade
-);
---> statement-breakpoint
-CREATE TABLE `file` (
-	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
-	`parent_id` integer,
-	`user_id` integer NOT NULL,
-	`path` text NOT NULL,
-	`master_encryption_key_version` integer NOT NULL,
-	`encrypted_data_encryption_key` text NOT NULL,
-	`data_encryption_key_version` integer NOT NULL,
-	`hmac_secret_key_version` integer,
-	`content_hmac` text,
-	`content_type` text NOT NULL,
-	`encrypted_content_iv` text NOT NULL,
-	`encrypted_name` text NOT NULL,
-	FOREIGN KEY (`parent_id`) REFERENCES `directory`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`user_id`,`master_encryption_key_version`) REFERENCES `master_encryption_key`(`user_id`,`version`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`user_id`,`hmac_secret_key_version`) REFERENCES `hmac_secret_key`(`user_id`,`version`) ON UPDATE no action ON DELETE no action
-);
---> statement-breakpoint
-CREATE TABLE `file_log` (
-	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
-	`file_id` integer NOT NULL,
-	`timestamp` integer NOT NULL,
-	`action` text NOT NULL,
-	`new_name` text,
-	FOREIGN KEY (`file_id`) REFERENCES `file`(`id`) ON UPDATE no action ON DELETE cascade
-);
---> statement-breakpoint
-CREATE TABLE `hmac_secret_key` (
-	`user_id` integer NOT NULL,
-	`version` integer NOT NULL,
-	`state` text NOT NULL,
-	`master_encryption_key_version` integer NOT NULL,
-	`encrypted_key` text NOT NULL,
-	PRIMARY KEY(`user_id`, `version`),
-	FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`user_id`,`master_encryption_key_version`) REFERENCES `master_encryption_key`(`user_id`,`version`) ON UPDATE no action ON DELETE no action
-);
---> statement-breakpoint
-CREATE TABLE `hmac_secret_key_log` (
-	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
-	`user_id` integer NOT NULL,
-	`hmac_secret_key_version` integer NOT NULL,
-	`timestamp` integer NOT NULL,
-	`action` text NOT NULL,
-	`action_by` integer,
-	FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`action_by`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`user_id`,`hmac_secret_key_version`) REFERENCES `hmac_secret_key`(`user_id`,`version`) ON UPDATE no action ON DELETE no action
-);
---> statement-breakpoint
-CREATE TABLE `client_master_encryption_key` (
-	`user_id` integer NOT NULL,
-	`client_id` integer NOT NULL,
-	`version` integer NOT NULL,
-	`encrypted_key` text NOT NULL,
-	`encrypted_key_signature` text NOT NULL,
-	PRIMARY KEY(`client_id`, `user_id`, `version`),
-	FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`client_id`) REFERENCES `client`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`user_id`,`version`) REFERENCES `master_encryption_key`(`user_id`,`version`) ON UPDATE no action ON DELETE no action
-);
---> statement-breakpoint
-CREATE TABLE `master_encryption_key` (
-	`user_id` integer NOT NULL,
-	`version` integer NOT NULL,
-	`state` text NOT NULL,
-	`retired_at` integer,
-	PRIMARY KEY(`user_id`, `version`),
-	FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE no action
-);
---> statement-breakpoint
-CREATE TABLE `master_encryption_key_log` (
-	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
-	`user_id` integer NOT NULL,
-	`master_encryption_key_version` integer NOT NULL,
-	`timestamp` integer NOT NULL,
-	`action` text NOT NULL,
-	`action_by` integer,
-	FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`action_by`) REFERENCES `client`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`user_id`,`master_encryption_key_version`) REFERENCES `master_encryption_key`(`user_id`,`version`) ON UPDATE no action ON DELETE no action
-);
---> statement-breakpoint
-CREATE TABLE `session` (
-	`id` text PRIMARY KEY NOT NULL,
-	`user_id` integer NOT NULL,
-	`client_id` integer,
-	`created_at` integer NOT NULL,
-	`last_used_at` integer NOT NULL,
-	`last_used_by_ip` text,
-	`last_used_by_user_agent` text,
-	FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`client_id`) REFERENCES `client`(`id`) ON UPDATE no action ON DELETE no action
-);
---> statement-breakpoint
-CREATE TABLE `session_upgrade_challenge` (
-	`id` integer PRIMARY KEY NOT NULL,
-	`session_id` text NOT NULL,
-	`client_id` integer NOT NULL,
-	`answer` text NOT NULL,
-	`allowed_ip` text NOT NULL,
-	`expires_at` integer NOT NULL,
-	FOREIGN KEY (`session_id`) REFERENCES `session`(`id`) ON UPDATE no action ON DELETE no action,
-	FOREIGN KEY (`client_id`) REFERENCES `client`(`id`) ON UPDATE no action ON DELETE no action
-);
---> statement-breakpoint
-CREATE TABLE `user` (
-	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
-	`email` text NOT NULL,
-	`password` text NOT NULL,
-	`nickname` text NOT NULL
-);
---> statement-breakpoint
-CREATE UNIQUE INDEX `client_encryption_public_key_unique` ON `client` (`encryption_public_key`);--> statement-breakpoint
-CREATE UNIQUE INDEX `client_signature_public_key_unique` ON `client` (`signature_public_key`);--> statement-breakpoint
-CREATE UNIQUE INDEX `client_encryption_public_key_signature_public_key_unique` ON `client` (`encryption_public_key`,`signature_public_key`);--> statement-breakpoint
-CREATE UNIQUE INDEX `user_client_challenge_answer_unique` ON `user_client_challenge` (`answer`);--> statement-breakpoint
-CREATE UNIQUE INDEX `directory_encrypted_data_encryption_key_unique` ON `directory` (`encrypted_data_encryption_key`);--> statement-breakpoint
-CREATE UNIQUE INDEX `file_path_unique` ON `file` (`path`);--> statement-breakpoint
-CREATE UNIQUE INDEX `file_encrypted_data_encryption_key_unique` ON `file` (`encrypted_data_encryption_key`);--> statement-breakpoint
-CREATE UNIQUE INDEX `hmac_secret_key_encrypted_key_unique` ON `hmac_secret_key` (`encrypted_key`);--> statement-breakpoint
-CREATE UNIQUE INDEX `session_user_id_client_id_unique` ON `session` (`user_id`,`client_id`);--> statement-breakpoint
-CREATE UNIQUE INDEX `session_upgrade_challenge_session_id_unique` ON `session_upgrade_challenge` (`session_id`);--> statement-breakpoint
-CREATE UNIQUE INDEX `session_upgrade_challenge_answer_unique` ON `session_upgrade_challenge` (`answer`);--> statement-breakpoint
-CREATE UNIQUE INDEX `user_email_unique` ON `user` (`email`);

drizzle/meta/_journal.json

@@ -1,13 +0,0 @@
-{
-  "version": "7",
-  "dialect": "sqlite",
-  "entries": [
-    {
-      "idx": 0,
-      "version": "6",
-      "when": 1736704436996,
-      "tag": "0000_unknown_stark_industries",
-      "breakpoints": true
-    }
-  ]
-}

eslint.config.js

@@ -1,21 +1,24 @@
-import prettier from "eslint-config-prettier";
-import js from "@eslint/js";
 import { includeIgnoreFile } from "@eslint/compat";
+import js from "@eslint/js";
+import { defineConfig } from "eslint/config";
+import prettier from "eslint-config-prettier";
 import svelte from "eslint-plugin-svelte";
 import tailwind from "eslint-plugin-tailwindcss";
 import globals from "globals";
-import { fileURLToPath } from "node:url";
 import ts from "typescript-eslint";
+import { fileURLToPath } from "url";
+import svelteConfig from "./svelte.config.js";
+
 const gitignorePath = fileURLToPath(new URL("./.gitignore", import.meta.url));
 
-export default ts.config(
+export default defineConfig(
   includeIgnoreFile(gitignorePath),
   js.configs.recommended,
   ...ts.configs.recommended,
-  ...svelte.configs["flat/recommended"],
+  ...svelte.configs.recommended,
   ...tailwind.configs["flat/recommended"],
   prettier,
-  ...svelte.configs["flat/prettier"],
+  ...svelte.configs.prettier,
   {
     languageOptions: {
       globals: {
@@ -23,13 +26,18 @@ export default ts.config(
         ...globals.node,
       },
     },
+    rules: {
+      "no-undef": "off",
+    },
   },
   {
-    files: ["**/*.svelte"],
-
+    files: ["**/*.svelte", "**/*.svelte.ts", "**/*.svelte.js"],
     languageOptions: {
       parserOptions: {
+        projectService: true,
+        extraFileExtensions: [".svelte"],
         parser: ts.parser,
+        svelteConfig,
       },
     },
   },

kysely.config.ts

@@ -0,0 +1,18 @@
+import { defineConfig } from "kysely-ctl";
+import { Pool } from "pg";
+
+export default defineConfig({
+  dialect: "pg",
+  dialectConfig: {
+    pool: new Pool({
+      host: process.env.DATABASE_HOST,
+      port: process.env.DATABASE_PORT ? parseInt(process.env.DATABASE_PORT) : undefined,
+      user: process.env.DATABASE_USER,
+      password: process.env.DATABASE_PASSWORD,
+      database: process.env.DATABASE_NAME,
+    }),
+  },
+  migrations: {
+    migrationFolder: "./src/lib/server/db/migrations",
+  },
+});

package.json

@@ -1,7 +1,7 @@
 {
   "name": "arkvault",
   "private": true,
-  "version": "0.2.0",
+  "version": "0.7.0",
   "type": "module",
   "scripts": {
     "dev": "vite dev",
@@ -11,54 +11,63 @@
     "check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
     "format": "prettier --write .",
     "lint": "prettier --check . && eslint .",
-    "db:push": "drizzle-kit push",
-    "db:generate": "drizzle-kit generate",
-    "db:migrate": "drizzle-kit migrate",
-    "db:studio": "drizzle-kit studio"
+    "db:up": "docker compose -f docker-compose.dev.yaml -p arkvault-dev up -d",
+    "db:down": "docker compose -f docker-compose.dev.yaml -p arkvault-dev down",
+    "db:migrate": "kysely migrate"
   },
   "devDependencies": {
-    "@eslint/compat": "^1.2.4",
-    "@iconify-json/material-symbols": "^1.2.12",
-    "@sveltejs/adapter-node": "^5.2.11",
-    "@sveltejs/kit": "^2.15.2",
-    "@sveltejs/vite-plugin-svelte": "^4.0.4",
-    "@types/better-sqlite3": "^7.6.12",
+    "@eslint/compat": "^2.0.0",
+    "@eslint/js": "^9.39.2",
+    "@iconify-json/material-symbols": "^1.2.50",
+    "@sveltejs/adapter-node": "^5.4.0",
+    "@sveltejs/kit": "^2.49.2",
+    "@sveltejs/vite-plugin-svelte": "^6.2.1",
+    "@tanstack/svelte-virtual": "^3.13.16",
+    "@trpc/client": "^11.8.1",
     "@types/file-saver": "^2.0.7",
     "@types/ms": "^0.7.34",
-    "@types/node-schedule": "^2.1.7",
-    "autoprefixer": "^10.4.20",
-    "dexie": "^4.0.10",
-    "drizzle-kit": "^0.22.8",
-    "eslint": "^9.17.0",
-    "eslint-config-prettier": "^9.1.0",
-    "eslint-plugin-svelte": "^2.46.1",
-    "eslint-plugin-tailwindcss": "^3.17.5",
+    "@types/node-schedule": "^2.1.8",
+    "@types/pg": "^8.16.0",
+    "autoprefixer": "^10.4.23",
+    "axios": "^1.13.2",
+    "dexie": "^4.2.1",
+    "eslint": "^9.39.2",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-svelte": "^3.13.1",
+    "eslint-plugin-tailwindcss": "^3.18.2",
+    "exifreader": "^4.33.1",
     "file-saver": "^2.0.5",
-    "globals": "^15.14.0",
+    "globals": "^16.5.0",
     "heic2any": "^0.0.4",
-    "mime": "^4.0.6",
-    "prettier": "^3.4.2",
-    "prettier-plugin-svelte": "^3.3.2",
-    "prettier-plugin-tailwindcss": "^0.6.9",
-    "svelte": "^5.17.1",
-    "svelte-check": "^4.1.3",
-    "tailwindcss": "^3.4.17",
-    "typescript": "^5.7.3",
-    "typescript-eslint": "^8.19.1",
-    "unplugin-icons": "^0.22.0",
-    "vite": "^5.4.11"
+    "kysely-ctl": "^0.19.0",
+    "lru-cache": "^11.2.4",
+    "mime": "^4.1.0",
+    "p-limit": "^7.2.0",
+    "prettier": "^3.7.4",
+    "prettier-plugin-svelte": "^3.4.1",
+    "prettier-plugin-tailwindcss": "^0.7.2",
+    "svelte": "^5.46.1",
+    "svelte-check": "^4.3.5",
+    "tailwindcss": "^3.4.19",
+    "typescript": "^5.9.3",
+    "typescript-eslint": "^8.51.0",
+    "unplugin-icons": "^22.5.0",
+    "vite": "^7.3.0"
   },
   "dependencies": {
-    "argon2": "^0.41.1",
-    "better-sqlite3": "^11.7.2",
-    "drizzle-orm": "^0.33.0",
+    "@fastify/busboy": "^3.2.0",
+    "@trpc/server": "^11.8.1",
+    "argon2": "^0.44.0",
+    "kysely": "^0.28.9",
     "ms": "^2.1.3",
     "node-schedule": "^2.1.1",
-    "uuid": "^11.0.4",
-    "zod": "^3.24.1"
+    "pg": "^8.16.3",
+    "superjson": "^2.2.6",
+    "uuid": "^13.0.0",
+    "zod": "^4.3.5"
   },
   "engines": {
     "node": "^22.0.0",
-    "pnpm": "^9.0.0"
+    "pnpm": "^10.0.0"
   }
 }

src/app.html

@@ -1,5 +1,5 @@
 <!doctype html>
-<html lang="en">
+<html lang="ko">
   <head>
     <meta charset="utf-8" />
     <link rel="icon" href="%sveltekit.assets%/favicon.png" />

src/hooks.client.ts

@@ -1,7 +1,18 @@
 import type { ClientInit } from "@sveltejs/kit";
-import { getClientKey, getMasterKeys, getHmacSecrets } from "$lib/indexedDB";
+import { cleanupDanglingInfos, getClientKey, getMasterKeys, getHmacSecrets } from "$lib/indexedDB";
+import { prepareFileCache } from "$lib/modules/file";
+import { prepareOpfs } from "$lib/modules/opfs";
 import { clientKeyStore, masterKeyStore, hmacSecretStore } from "$lib/stores";
 
+const requestPersistentStorage = async () => {
+  const isPersistent = await navigator.storage.persist();
+  if (isPersistent) {
+    console.log("[ArkVault] Persistent storage granted.");
+  } else {
+    console.warn("[ArkVault] Persistent storage not granted.");
+  }
+};
+
 const prepareClientKeyStore = async () => {
   const [encryptKey, decryptKey, signKey, verifyKey] = await Promise.all([
     getClientKey("encrypt"),
@@ -29,5 +40,14 @@ const prepareHmacSecretStore = async () => {
 };
 
 export const init: ClientInit = async () => {
-  await Promise.all([prepareClientKeyStore(), prepareMasterKeyStore(), prepareHmacSecretStore()]);
+  await Promise.all([
+    requestPersistentStorage(),
+    prepareFileCache(),
+    prepareClientKeyStore(),
+    prepareMasterKeyStore(),
+    prepareHmacSecretStore(),
+    prepareOpfs(),
+  ]);
+
+  cleanupDanglingInfos(); // Intended
 };

src/hooks.server.ts

@@ -2,15 +2,15 @@ import type { ServerInit } from "@sveltejs/kit";
 import { sequence } from "@sveltejs/kit/hooks";
 import schedule from "node-schedule";
 import { cleanupExpiredUserClientChallenges } from "$lib/server/db/client";
-import { migrateDB } from "$lib/server/db/drizzle";
+import { migrateDB } from "$lib/server/db/kysely";
 import {
   cleanupExpiredSessions,
   cleanupExpiredSessionUpgradeChallenges,
 } from "$lib/server/db/session";
 import { authenticate, setAgentInfo } from "$lib/server/middlewares";
 
-export const init: ServerInit = () => {
-  migrateDB();
+export const init: ServerInit = async () => {
+  await migrateDB();
 
   schedule.scheduleJob("0 * * * *", () => {
     cleanupExpiredUserClientChallenges();

src/lib/components/BottomSheet.svelte

@@ -1,39 +0,0 @@
-<script lang="ts">
-  import type { Snippet } from "svelte";
-  import { fade, fly } from "svelte/transition";
-  import { AdaptiveDiv } from "$lib/components/divs";
-
-  interface Props {
-    children: Snippet;
-    onclose?: () => void;
-    isOpen: boolean;
-  }
-
-  let { children, onclose, isOpen = $bindable() }: Props = $props();
-
-  const closeBottomSheet = $derived(
-    onclose ||
-      (() => {
-        isOpen = false;
-      }),
-  );
-</script>
-
-{#if isOpen}
-  <!-- svelte-ignore a11y_click_events_have_key_events -->
-  <!-- svelte-ignore a11y_no_static_element_interactions -->
-  <div onclick={closeBottomSheet} class="fixed inset-0 z-10 flex items-end justify-center">
-    <div class="absolute inset-0 bg-black bg-opacity-50" transition:fade={{ duration: 100 }}></div>
-    <div class="z-20 w-full">
-      <AdaptiveDiv>
-        <div
-          onclick={(e) => e.stopPropagation()}
-          class="flex max-h-[70vh] min-h-[30vh] rounded-t-2xl bg-white px-4"
-          transition:fly={{ y: 100, duration: 200 }}
-        >
-          {@render children?.()}
-        </div>
-      </AdaptiveDiv>
-    </div>
-  </div>
-{/if}

src/lib/components/Modal.svelte

@@ -1,38 +0,0 @@
-<script lang="ts">
-  import type { Snippet } from "svelte";
-  import { fade } from "svelte/transition";
-  import { AdaptiveDiv } from "$lib/components/divs";
-
-  interface Props {
-    children: Snippet;
-    onclose?: () => void;
-    isOpen: boolean;
-  }
-
-  let { children, onclose, isOpen = $bindable() }: Props = $props();
-
-  const closeModal = $derived(
-    onclose ||
-      (() => {
-        isOpen = false;
-      }),
-  );
-</script>
-
-{#if isOpen}
-  <!-- svelte-ignore a11y_click_events_have_key_events -->
-  <!-- svelte-ignore a11y_no_static_element_interactions -->
-  <div
-    onclick={closeModal}
-    class="fixed inset-0 z-10 bg-black bg-opacity-50"
-    transition:fade={{ duration: 100 }}
-  >
-    <AdaptiveDiv>
-      <div class="flex h-full items-center justify-center px-4">
-        <div onclick={(e) => e.stopPropagation()} class="rounded-2xl bg-white p-4">
-          {@render children?.()}
-        </div>
-      </div>
-    </AdaptiveDiv>
-  </div>
-{/if}

src/lib/components/TopBar.svelte

@@ -1,31 +0,0 @@
-<script lang="ts">
-  import type { Snippet } from "svelte";
-
-  import IconArrowBack from "~icons/material-symbols/arrow-back";
-
-  interface Props {
-    children?: Snippet;
-    onback?: () => void;
-    title?: string;
-  }
-
-  let { children, onback, title }: Props = $props();
-
-  const back = $derived(() => {
-    setTimeout(onback || (() => history.back()), 100);
-  });
-</script>
-
-<div class="sticky top-0 z-10 flex flex-shrink-0 items-center justify-between bg-white py-4">
-  <button onclick={back} class="w-[2.3rem] flex-shrink-0 rounded-full p-1 active:bg-gray-100">
-    <IconArrowBack class="text-2xl" />
-  </button>
-  {#if title}
-    <p class="flex-grow truncate px-2 text-center text-lg font-semibold">{title}</p>
-  {/if}
-  <div class="w-[2.3rem] flex-shrink-0">
-    {#if children}
-      {@render children?.()}
-    {/if}
-  </div>
-</div>

src/lib/components/atoms/BottomSheet.svelte

@@ -0,0 +1,40 @@
+<script lang="ts">
+  import type { Snippet } from "svelte";
+  import type { ClassValue } from "svelte/elements";
+  import { fade, fly } from "svelte/transition";
+  import { AdaptiveDiv } from "$lib/components/atoms";
+
+  interface Props {
+    children: Snippet;
+    class?: ClassValue;
+    isOpen: boolean;
+    onclose?: () => void;
+  }
+
+  let { children, class: className, isOpen = $bindable(), onclose }: Props = $props();
+</script>
+
+{#if isOpen}
+  <!-- svelte-ignore a11y_click_events_have_key_events -->
+  <!-- svelte-ignore a11y_no_static_element_interactions -->
+  <div
+    onclick={onclose || (() => (isOpen = false))}
+    class="fixed inset-0 z-10 flex items-end justify-center"
+  >
+    <div
+      class="absolute inset-0 bg-black bg-opacity-50"
+      transition:fade|global={{ duration: 100 }}
+    ></div>
+    <AdaptiveDiv class="z-10 w-full">
+      <div
+        onclick={(e) => e.stopPropagation()}
+        class="flex max-h-[70vh] min-h-[30vh] flex-col rounded-t-2xl bg-white"
+        transition:fly|global={{ y: 100, duration: 200 }}
+      >
+        <div class={["flex-grow overflow-y-auto", className]}>
+          {@render children()}
+        </div>
+      </div>
+    </AdaptiveDiv>
+  </div>
+{/if}

src/lib/components/atoms/Modal.svelte

@@ -0,0 +1,31 @@
+<script lang="ts">
+  import type { Snippet } from "svelte";
+  import type { ClassValue } from "svelte/elements";
+  import { fade } from "svelte/transition";
+  import { AdaptiveDiv } from "$lib/components/atoms";
+
+  interface Props {
+    children: Snippet;
+    class?: ClassValue;
+    isOpen: boolean;
+    onclose?: () => void;
+  }
+
+  let { children, class: className, isOpen = $bindable(), onclose }: Props = $props();
+</script>
+
+{#if isOpen}
+  <!-- svelte-ignore a11y_click_events_have_key_events -->
+  <!-- svelte-ignore a11y_no_static_element_interactions -->
+  <div
+    onclick={onclose || (() => (isOpen = false))}
+    class="fixed inset-0 z-10 bg-black bg-opacity-50"
+    transition:fade|global={{ duration: 100 }}
+  >
+    <AdaptiveDiv class="flex h-full items-center justify-center px-4">
+      <div onclick={(e) => e.stopPropagation()} class={["rounded-2xl bg-white p-4", className]}>
+        {@render children()}
+      </div>
+    </AdaptiveDiv>
+  </div>
+{/if}

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/ActionEntryButton.svelte

@@ -0,0 +1,59 @@
+<script lang="ts">
+  import type { Component, Snippet } from "svelte";
+  import type { ClassValue, SvelteHTMLElements } from "svelte/elements";
+
+  interface Props {
+    actionButtonClass?: ClassValue;
+    actionButtonIcon?: Component<SvelteHTMLElements["svg"]>;
+    children: Snippet;
+    class?: ClassValue;
+    onActionButtonClick?: () => void;
+    onclick?: () => void;
+  }
+
+  let {
+    actionButtonIcon: ActionButtonIcon,
+    actionButtonClass: actionButtonClassName,
+    children,
+    class: className,
+    onActionButtonClick,
+    onclick,
+  }: Props = $props();
+</script>
+
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<!-- svelte-ignore a11y_click_events_have_key_events -->
+<div
+  id="container"
+  onclick={onclick && (() => setTimeout(onclick, 100))}
+  class={["rounded-xl", className]}
+>
+  <div id="children" class="flex h-full items-center gap-x-4 p-2 transition">
+    <div class="flex-grow overflow-x-hidden">
+      {@render children()}
+    </div>
+    {#if ActionButtonIcon}
+      <button
+        id="action-button"
+        onclick={(e) => {
+          e.stopPropagation();
+          if (onActionButtonClick) {
+            setTimeout(onActionButtonClick, 100);
+          }
+        }}
+        class={["flex-shrink-0 rounded-full p-1 text-lg active:bg-gray-100", actionButtonClassName]}
+      >
+        <ActionButtonIcon />
+      </button>
+    {/if}
+  </div>
+</div>
+
+<style>
+  #container:active:not(:has(#action-button:active)) {
+    @apply bg-gray-100;
+  }
+  #children:active:not(:has(#action-button:active)) {
+    @apply scale-95;
+  }
+</style>

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

@@ -0,0 +1,38 @@
+<script lang="ts">
+  import type { Snippet } from "svelte";
+  import type { ClassValue } from "svelte/elements";
+
+  interface Props {
+    children: Snippet;
+    class?: ClassValue;
+    color?: "primary" | "gray";
+    onclick?: () => void;
+  }
+
+  let { children, class: className, color = "primary", onclick }: Props = $props();
+
+  let bgColor = $derived(
+    {
+      primary: "bg-primary-600 active:bg-primary-500",
+      gray: "bg-gray-300 active:bg-gray-400",
+    }[color],
+  );
+  let textColor = $derived(
+    {
+      primary: "text-white",
+      gray: "text-gray-800",
+    }[color],
+  );
+</script>
+
+<button
+  onclick={onclick && (() => setTimeout(onclick, 100))}
+  class={[
+    "h-12 min-w-fit rounded-xl p-3 font-medium transition active:scale-95",
+    bgColor,
+    textColor,
+    className,
+  ]}
+>
+  {@render children()}
+</button>

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

@@ -0,0 +1,26 @@
+<script lang="ts">
+  import type { Snippet } from "svelte";
+  import type { ClassValue } from "svelte/elements";
+
+  import IconChevronRight from "~icons/material-symbols/chevron-right";
+
+  interface Props {
+    children: Snippet;
+    class?: ClassValue;
+    onclick?: () => void;
+  }
+
+  let { children, class: className, onclick }: Props = $props();
+</script>
+
+<button
+  onclick={onclick && (() => setTimeout(onclick, 100))}
+  class={["rounded-xl active:bg-gray-100", className]}
+>
+  <div class="flex h-full items-center gap-x-4 p-2 transition active:scale-95">
+    <div class="flex-grow">
+      {@render children()}
+    </div>
+    <IconChevronRight class="flex-shrink-0 text-xl text-gray-800" />
+  </div>
+</button>

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

@@ -0,0 +1,24 @@
+<script lang="ts">
+  import { getFileThumbnail } from "$lib/modules/file";
+  import type { SummarizedFileInfo } from "$lib/modules/filesystem";
+
+  interface Props {
+    info: SummarizedFileInfo;
+    onclick?: (file: SummarizedFileInfo) => void;
+  }
+
+  let { info, onclick }: Props = $props();
+
+  let thumbnail = $derived(getFileThumbnail(info));
+</script>
+
+<button
+  onclick={onclick && (() => setTimeout(() => onclick(info), 100))}
+  class="aspect-square overflow-hidden rounded transition active:scale-95 active:brightness-90"
+>
+  {#if $thumbnail}
+    <img src={$thumbnail} alt={info.name} class="h-full w-full object-cover" />
+  {:else}
+    <div class="h-full w-full bg-gray-100"></div>
+  {/if}
+</button>

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

@@ -0,0 +1,27 @@
+<script lang="ts">
+  import type { Component } from "svelte";
+  import type { ClassValue, SvelteHTMLElements } from "svelte/elements";
+  import { AdaptiveDiv } from "$lib/components/atoms";
+
+  interface Props {
+    class: ClassValue;
+    icon: Component<SvelteHTMLElements["svg"]>;
+    onclick?: () => void;
+  }
+
+  let { class: className, icon: Icon, onclick }: Props = $props();
+</script>
+
+<div class="pointer-events-none fixed inset-0">
+  <AdaptiveDiv class="relative h-full">
+    <button
+      onclick={onclick && (() => setTimeout(onclick, 100))}
+      class={[
+        "pointer-events-auto absolute flex h-14 w-14 items-center justify-center rounded-full bg-gray-300 text-xl shadow-lg transition active:scale-95 active:bg-gray-400",
+        className,
+      ]}
+    >
+      <Icon />
+    </button>
+  </AdaptiveDiv>
+</div>

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

@@ -10,14 +10,10 @@
 </script>
 
 <button
-  onclick={() => {
-    setTimeout(() => {
-      onclick?.();
-    }, 100);
-  }}
+  onclick={onclick && (() => setTimeout(onclick, 100))}
   class="text-sm font-medium text-gray-800 underline underline-offset-2 active:rounded-xl active:bg-gray-100"
 >
-  <div class="h-full w-full p-1 transition active:scale-95">
-    {@render children?.()}
+  <div class="h-full p-1 transition active:scale-95">
+    {@render children()}
   </div>
 </button>

src/lib/components/atoms/buttons/index.ts

@@ -1,4 +1,6 @@
+export { default as ActionEntryButton } from "./ActionEntryButton.svelte";
 export { default as Button } from "./Button.svelte";
 export { default as EntryButton } from "./EntryButton.svelte";
+export { default as FileThumbnailButton } from "./FileThumbnailButton.svelte";
 export { default as FloatingButton } from "./FloatingButton.svelte";
 export { default as TextButton } from "./TextButton.svelte";

src/lib/components/atoms/divs/AdaptiveDiv.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+  import type { Snippet } from "svelte";
+  import type { ClassValue } from "svelte/elements";
+
+  interface Props {
+    children: Snippet;
+    class?: ClassValue;
+  }
+
+  let { children, class: className }: Props = $props();
+</script>
+
+<div class={["mx-auto max-w-screen-md", className]}>
+  {@render children()}
+</div>

src/lib/components/atoms/divs/BottomDiv.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+  import type { Snippet } from "svelte";
+  import type { ClassValue } from "svelte/elements";
+
+  interface Props {
+    children: Snippet;
+    class?: ClassValue;
+  }
+
+  let { children, class: className }: Props = $props();
+</script>
+
+<div class={["sticky bottom-0 bg-white pb-4", className]}>
+  {@render children()}
+</div>

src/lib/components/atoms/divs/FullscreenDiv.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+  import type { Snippet } from "svelte";
+  import type { ClassValue } from "svelte/elements";
+
+  interface Props {
+    children: Snippet;
+    class?: ClassValue;
+  }
+
+  let { children, class: className }: Props = $props();
+</script>
+
+<div class={["flex flex-grow flex-col justify-between px-4", className]}>
+  {@render children()}
+</div>

src/lib/components/atoms/divs/index.ts

@@ -1,3 +1,3 @@
 export { default as AdaptiveDiv } from "./AdaptiveDiv.svelte";
 export { default as BottomDiv } from "./BottomDiv.svelte";
-export { default as TitleDiv } from "./TitleDiv.svelte";
+export { default as FullscreenDiv } from "./FullscreenDiv.svelte";

src/lib/components/atoms/index.ts

@@ -0,0 +1,6 @@
+export { default as BottomSheet } from "./BottomSheet.svelte";
+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/atoms/inputs/CheckBox.svelte

@@ -0,0 +1,23 @@
+<script lang="ts">
+  import type { Snippet } from "svelte";
+
+  import IconCheckCircle from "~icons/material-symbols/check-circle";
+  import IconCheckCircleOutline from "~icons/material-symbols/check-circle-outline";
+
+  interface Props {
+    checked?: boolean;
+    children: Snippet;
+  }
+
+  let { checked = $bindable(false), children }: Props = $props();
+</script>
+
+<label class="flex items-center gap-x-1">
+  <input bind:checked type="checkbox" class="hidden" />
+  {@render children()}
+  {#if checked}
+    <IconCheckCircle class="text-primary-600" />
+  {:else}
+    <IconCheckCircleOutline class="text-gray-300" />
+  {/if}
+</label>

src/lib/components/atoms/inputs/TextInput.svelte

@@ -0,0 +1,40 @@
+<script lang="ts">
+  import type { ClassValue } from "svelte/elements";
+
+  interface Props {
+    class?: ClassValue;
+    placeholder: string;
+    type?: "text" | "password";
+    value?: string;
+  }
+
+  let { class: className, placeholder, type = "text", value = $bindable("") }: Props = $props();
+</script>
+
+<div class={className}>
+  <div class="relative mt-5">
+    <input
+      bind:value
+      {type}
+      placeholder=""
+      class="w-full border-b-2 border-gray-300 py-1 text-xl outline-none transition duration-300 ease-in-out"
+    />
+    <!-- svelte-ignore a11y_label_has_associated_control -->
+    <label
+      class="pointer-events-none absolute left-0 top-1/2 -translate-y-1/2 transform text-xl text-gray-400 transition-all duration-300 ease-in-out"
+    >
+      {placeholder}
+    </label>
+  </div>
+</div>
+
+<style>
+  input:focus,
+  input:not(:placeholder-shown) {
+    @apply border-primary-300;
+  }
+  input:focus + label,
+  input:not(:placeholder-shown) + label {
+    @apply top-0 -translate-y-full text-sm text-primary-400;
+  }
+</style>

src/lib/components/atoms/inputs/index.ts

@@ -1 +1,2 @@
+export { default as CheckBox } from "./CheckBox.svelte";
 export { default as TextInput } from "./TextInput.svelte";

src/lib/components/buttons/Button.svelte

@@ -1,37 +0,0 @@
-<script lang="ts">
-  import type { Snippet } from "svelte";
-
-  interface Props {
-    children: Snippet;
-    color?: "primary" | "gray";
-    onclick?: () => void;
-  }
-
-  let { children, color = "primary", onclick }: Props = $props();
-
-  const bgColorStyle = $derived(
-    {
-      primary: "bg-primary-600 active:bg-primary-500",
-      gray: "bg-gray-300 active:bg-gray-400",
-    }[color],
-  );
-  const fontColorStyle = $derived(
-    {
-      primary: "text-white",
-      gray: "text-gray-800",
-    }[color],
-  );
-</script>
-
-<button
-  onclick={() => {
-    setTimeout(() => {
-      onclick?.();
-    }, 100);
-  }}
-  class="{bgColorStyle} {fontColorStyle} h-12 w-full min-w-fit rounded-xl font-medium"
->
-  <div class="h-full w-full p-3 transition active:scale-95">
-    {@render children?.()}
-  </div>
-</button>

src/lib/components/buttons/EntryButton.svelte

@@ -1,30 +0,0 @@
-<script lang="ts">
-  import type { Snippet } from "svelte";
-
-  import IconChevronRight from "~icons/material-symbols/chevron-right";
-
-  interface Props {
-    children: Snippet;
-    onclick?: () => void;
-  }
-
-  let { children, onclick }: Props = $props();
-</script>
-
-<button
-  onclick={() => {
-    setTimeout(() => {
-      onclick?.();
-    }, 100);
-  }}
-  class="w-full rounded-xl active:bg-gray-100"
->
-  <div class="flex w-full justify-between p-2 transition active:scale-95">
-    <div>
-      {@render children?.()}
-    </div>
-    <div class="flex items-center justify-center">
-      <IconChevronRight class="text-xl text-gray-800" />
-    </div>
-  </div>
-</button>

src/lib/components/buttons/FloatingButton.svelte

@@ -1,36 +0,0 @@
-<script lang="ts">
-  import type { Component } from "svelte";
-  import type { SvelteHTMLElements } from "svelte/elements";
-  import { AdaptiveDiv } from "$lib/components/divs";
-
-  interface Props {
-    icon: Component<SvelteHTMLElements["svg"]>;
-    offset?: string;
-    onclick?: () => void;
-  }
-
-  let { icon: Icon, offset = "bottom-20", onclick }: Props = $props();
-
-  const click = () => {
-    setTimeout(() => {
-      onclick?.();
-    }, 100);
-  };
-</script>
-
-<div class="pointer-events-none fixed inset-0">
-  <div class="absolute w-full {offset}">
-    <AdaptiveDiv>
-      <div class="relative">
-        <div class="absolute bottom-4 right-4">
-          <button
-            onclick={click}
-            class="pointer-events-auto flex h-14 w-14 items-center justify-center rounded-full bg-gray-300 shadow-lg transition active:scale-95 active:bg-gray-400"
-          >
-            <Icon class="text-xl" />
-          </button>
-        </div>
-      </div>
-    </AdaptiveDiv>
-  </div>
-</div>

src/lib/components/divs/AdaptiveDiv.svelte

@@ -1,7 +0,0 @@
-<script lang="ts">
-  let { children } = $props();
-</script>
-
-<div class="mx-auto h-full w-full max-w-screen-md">
-  {@render children?.()}
-</div>

src/lib/components/divs/BottomDiv.svelte

@@ -1,7 +0,0 @@
-<script lang="ts">
-  let { children } = $props();
-</script>
-
-<div class="sticky bottom-0 flex flex-col items-center gap-y-2 bg-white pb-4">
-  {@render children?.()}
-</div>

src/lib/components/divs/TitleDiv.svelte

@@ -1,21 +0,0 @@
-<script lang="ts">
-  import type { Component, Snippet } from "svelte";
-  import type { SvelteHTMLElements } from "svelte/elements";
-
-  interface Props {
-    children: Snippet;
-    icon?: Component<SvelteHTMLElements["svg"]>;
-    topPadding?: boolean;
-  }
-
-  let { topPadding = true, children, icon: Icon }: Props = $props();
-</script>
-
-<div>
-  <div class="box-content flex min-h-[10vh] items-center {topPadding ? 'pt-4' : ''}">
-    {#if Icon}
-      <Icon class="text-5xl text-gray-600" />
-    {/if}
-  </div>
-  {@render children?.()}
-</div>

src/lib/components/index.ts

@@ -1,3 +0,0 @@
-export { default as BottomSheet } from "./BottomSheet.svelte";
-export { default as Modal } from "./Modal.svelte";
-export { default as TopBar } from "./TopBar.svelte";

src/lib/components/inputs/TextInput.svelte

@@ -1,35 +0,0 @@
-<script lang="ts">
-  interface Props {
-    placeholder: string;
-    type?: "text" | "password";
-    value?: string;
-  }
-
-  let { placeholder, type = "text", value = $bindable("") }: Props = $props();
-</script>
-
-<div class="relative mt-5">
-  <input
-    bind:value
-    {type}
-    placeholder=""
-    class="w-full border-b-2 border-gray-300 py-1 text-xl outline-none transition duration-300 ease-in-out"
-  />
-  <!-- svelte-ignore a11y_label_has_associated_control -->
-  <label
-    class="absolute left-0 top-1/2 -translate-y-1/2 transform text-xl text-gray-400 transition-all duration-300 ease-in-out"
-  >
-    {placeholder}
-  </label>
-</div>
-
-<style>
-  input:focus,
-  input:not(:placeholder-shown) {
-    @apply border-primary-300;
-  }
-  input:focus + label,
-  input:not(:placeholder-shown) + label {
-    @apply top-0 -translate-y-full text-sm text-primary-400;
-  }
-</style>

src/lib/components/molecules/ActionModal.svelte

@@ -0,0 +1,57 @@
+<script module lang="ts">
+  export type ConfirmHandler = () => void | Promise<void> | boolean | Promise<boolean>;
+</script>
+
+<script lang="ts">
+  import type { Snippet } from "svelte";
+  import { Button, Modal } from "$lib/components/atoms";
+
+  interface Props {
+    cancelText?: string;
+    children: Snippet;
+    confirmText: string;
+    isOpen: boolean;
+    onbeforeclose?: () => void;
+    oncancel?: () => void;
+    onConfirmClick: ConfirmHandler;
+    title: string;
+  }
+
+  let {
+    cancelText = "닫기",
+    children,
+    confirmText,
+    isOpen = $bindable(),
+    onbeforeclose,
+    oncancel,
+    onConfirmClick,
+    title,
+  }: Props = $props();
+
+  const closeModal = () => {
+    onbeforeclose?.();
+    isOpen = false;
+  };
+
+  const cancelAction = () => {
+    oncancel?.();
+    closeModal();
+  };
+
+  const confirmAction = async () => {
+    if ((await onConfirmClick()) !== false) {
+      closeModal();
+    }
+  };
+</script>
+
+<Modal bind:isOpen onclose={cancelAction} class="space-y-4">
+  <div class="flex flex-col gap-y-2 break-keep">
+    <p class="text-xl font-bold">{title}</p>
+    {@render children()}
+  </div>
+  <div class="flex gap-x-2">
+    <Button color="gray" onclick={cancelAction} class="flex-1">{cancelText}</Button>
+    <Button onclick={confirmAction} class="flex-1">{confirmText}</Button>
+  </div>
+</Modal>

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([...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/IconEntryButton.svelte

@@ -0,0 +1,30 @@
+<script lang="ts">
+  import type { Component, Snippet } from "svelte";
+  import type { ClassValue, SvelteHTMLElements } from "svelte/elements";
+  import { EntryButton } from "$lib/components/atoms";
+  import { IconLabel } from "$lib/components/molecules";
+
+  interface Props {
+    children: Snippet;
+    class?: ClassValue;
+    icon: Component<SvelteHTMLElements["svg"]>;
+    iconClass?: ClassValue;
+    onclick?: () => void;
+    textClass?: ClassValue;
+  }
+
+  let {
+    children,
+    class: className,
+    icon,
+    iconClass: iconClassName,
+    onclick,
+    textClass: textClassName,
+  }: Props = $props();
+</script>
+
+<EntryButton {onclick} class={className}>
+  <IconLabel {icon} class="h-full" iconClass={iconClassName} textClass={textClassName}>
+    {@render children()}
+  </IconLabel>
+</EntryButton>

src/lib/components/molecules/SubCategories.svelte

@@ -0,0 +1,55 @@
+<script lang="ts">
+  import type { Component } from "svelte";
+  import type { ClassValue, SvelteHTMLElements } from "svelte/elements";
+  import { Categories, IconEntryButton, type SelectedCategory } from "$lib/components/molecules";
+  import type { CategoryInfo } from "$lib/modules/filesystem";
+
+  import IconAddCircle from "~icons/material-symbols/add-circle";
+
+  interface Props {
+    class?: ClassValue;
+    info: CategoryInfo;
+    onSubCategoryClick: (subCategory: SelectedCategory) => void;
+    onSubCategoryCreateClick: () => void;
+    onSubCategoryMenuClick?: (category: SelectedCategory) => void;
+    subCategoryCreatePosition?: "top" | "bottom";
+    subCategoryMenuIcon?: Component<SvelteHTMLElements["svg"]>;
+  }
+
+  let {
+    class: className,
+    info,
+    onSubCategoryClick,
+    onSubCategoryCreateClick,
+    onSubCategoryMenuClick,
+    subCategoryCreatePosition = "bottom",
+    subCategoryMenuIcon,
+  }: Props = $props();
+</script>
+
+<div class={["space-y-1", className]}>
+  {#snippet subCategoryCreate()}
+    <IconEntryButton
+      icon={IconAddCircle}
+      onclick={onSubCategoryCreateClick}
+      class="h-12 w-full"
+      iconClass="text-gray-600"
+      textClass="text-gray-700"
+    >
+      카테고리 추가하기
+    </IconEntryButton>
+  {/snippet}
+
+  {#if subCategoryCreatePosition === "top"}
+    {@render subCategoryCreate()}
+  {/if}
+  <Categories
+    categories={info.subCategories}
+    categoryMenuIcon={subCategoryMenuIcon}
+    onCategoryClick={onSubCategoryClick}
+    onCategoryMenuClick={onSubCategoryMenuClick}
+  />
+  {#if subCategoryCreatePosition === "bottom"}
+    {@render subCategoryCreate()}
+  {/if}
+</div>

src/lib/components/molecules/TitledDiv.svelte

@@ -0,0 +1,43 @@
+<script lang="ts">
+  import type { Component, Snippet } from "svelte";
+  import type { ClassValue, SvelteHTMLElements } from "svelte/elements";
+  import { TitleLabel } from "$lib/components/molecules";
+
+  interface Props {
+    children?: Snippet;
+    childrenClass?: ClassValue;
+    class?: ClassValue;
+    description?: Snippet;
+    icon?: Component<SvelteHTMLElements["svg"]>;
+    title: Snippet;
+    titleClass?: ClassValue;
+  }
+
+  let {
+    children,
+    childrenClass: childrenClassName,
+    class: className,
+    description,
+    icon,
+    title,
+    titleClass: titleClassName,
+  }: Props = $props();
+</script>
+
+<div class={["space-y-4 py-4", className]}>
+  <div class="space-y-2 break-keep">
+    <TitleLabel {icon} textClass={titleClassName}>
+      {@render title()}
+    </TitleLabel>
+    {#if description}
+      <p>
+        {@render description()}
+      </p>
+    {/if}
+  </div>
+  {#if children}
+    <div class={childrenClassName}>
+      {@render children()}
+    </div>
+  {/if}
+</div>

src/lib/components/molecules/TopBar.svelte

@@ -0,0 +1,37 @@
+<script lang="ts">
+  import type { Snippet } from "svelte";
+  import type { ClassValue } from "svelte/elements";
+
+  import IconArrowBack from "~icons/material-symbols/arrow-back";
+
+  interface Props {
+    children?: Snippet;
+    class?: ClassValue;
+    onBackClick?: () => void;
+    title?: string;
+  }
+
+  let { children, class: className, onBackClick, title }: Props = $props();
+</script>
+
+<div
+  class={[
+    "sticky top-0 z-10 flex items-center justify-between gap-x-2 px-2 py-3 backdrop-blur-2xl",
+    className,
+  ]}
+>
+  <button
+    onclick={onBackClick || (() => history.back())}
+    class="w-[2.3rem] flex-shrink-0 rounded-full p-1 active:bg-black active:bg-opacity-[0.04]"
+  >
+    <IconArrowBack class="text-2xl" />
+  </button>
+  {#if title}
+    <p class="flex-grow truncate text-center text-lg font-semibold">{title}</p>
+  {/if}
+  <div class="w-[2.3rem] flex-shrink-0">
+    {#if children}
+      {@render children()}
+    {/if}
+  </div>
+</div>

src/lib/components/molecules/index.ts

@@ -0,0 +1,9 @@
+export * from "./ActionModal.svelte";
+export { default as ActionModal } from "./ActionModal.svelte";
+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";
+export { default as TitledDiv } from "./TitledDiv.svelte";
+export { default as TopBar } from "./TopBar.svelte";

src/lib/components/molecules/labels/CategoryLabel.svelte

@@ -0,0 +1,28 @@
+<script lang="ts">
+  import type { ClassValue } from "svelte/elements";
+  import { IconLabel } from "$lib/components/molecules";
+
+  import IconCategory from "~icons/material-symbols/category";
+
+  interface Props {
+    class?: ClassValue;
+    name: string;
+    subtext?: string;
+    textClass?: ClassValue;
+  }
+
+  let { class: className, name, subtext, textClass: textClassName }: Props = $props();
+</script>
+
+{#snippet subtextSnippet()}
+  {subtext}
+{/snippet}
+
+<IconLabel
+  icon={IconCategory}
+  subtext={subtext ? subtextSnippet : undefined}
+  class={className}
+  textClass={textClassName}
+>
+  {name}
+</IconLabel>

src/lib/components/molecules/labels/DirectoryEntryLabel.svelte

@@ -0,0 +1,53 @@
+<script lang="ts">
+  import type { ClassValue } from "svelte/elements";
+  import { IconLabel } from "$lib/components/molecules";
+
+  import IconFolder from "~icons/material-symbols/folder";
+  import IconDriveFolderUpload from "~icons/material-symbols/drive-folder-upload";
+  import IconDraft from "~icons/material-symbols/draft";
+
+  interface Props {
+    class?: ClassValue;
+    name: string;
+    subtext?: string;
+    textClass?: ClassValue;
+    thumbnail?: string;
+    type: "directory" | "parent-directory" | "file";
+  }
+
+  let {
+    class: className,
+    name,
+    subtext,
+    textClass: textClassName,
+    thumbnail,
+    type,
+  }: Props = $props();
+</script>
+
+{#snippet iconSnippet()}
+  <div class="flex h-10 w-10 items-center justify-center text-xl">
+    {#if thumbnail}
+      <img src={thumbnail} alt={name} loading="lazy" class="aspect-square rounded object-cover" />
+    {:else if type === "directory"}
+      <IconFolder />
+    {:else if type === "parent-directory"}
+      <IconDriveFolderUpload class="text-yellow-500" />
+    {:else}
+      <IconDraft class="text-blue-400" />
+    {/if}
+  </div>
+{/snippet}
+
+{#snippet subtextSnippet()}
+  {subtext}
+{/snippet}
+
+<IconLabel
+  {iconSnippet}
+  subtext={subtext ? subtextSnippet : undefined}
+  class={className}
+  textClass={textClassName}
+>
+  {name}
+</IconLabel>

src/lib/components/molecules/labels/IconLabel.svelte

@@ -0,0 +1,46 @@
+<script lang="ts">
+  import type { Component, Snippet } from "svelte";
+  import type { ClassValue, SvelteHTMLElements } from "svelte/elements";
+
+  interface Props {
+    children: Snippet;
+    class?: ClassValue;
+    icon?: Component<SvelteHTMLElements["svg"]>;
+    iconClass?: ClassValue;
+    iconSnippet?: Snippet;
+    subtext?: Snippet;
+    textClass?: ClassValue;
+  }
+
+  let {
+    children,
+    class: className,
+    icon: Icon,
+    iconClass: iconClassName,
+    iconSnippet,
+    subtext,
+    textClass: textClassName,
+  }: Props = $props();
+</script>
+
+<div class={["flex items-center gap-x-4", className]}>
+  {#if iconSnippet}
+    <div class={["flex-shrink-0", iconClassName]}>
+      {@render iconSnippet()}
+    </div>
+  {:else if Icon}
+    <div class={["flex-shrink-0 text-lg", iconClassName]}>
+      <Icon />
+    </div>
+  {/if}
+  <div class="flex flex-grow flex-col overflow-x-hidden text-left">
+    <p class={["truncate font-medium", textClassName]}>
+      {@render children()}
+    </p>
+    {#if subtext}
+      <p class="truncate text-xs text-gray-800">
+        {@render subtext()}
+      </p>
+    {/if}
+  </div>
+</div>

src/lib/components/molecules/labels/TitleLabel.svelte

@@ -0,0 +1,24 @@
+<script lang="ts">
+  import type { Component, Snippet } from "svelte";
+  import type { ClassValue, SvelteHTMLElements } from "svelte/elements";
+
+  interface Props {
+    children: Snippet;
+    class?: ClassValue;
+    icon?: Component<SvelteHTMLElements["svg"]>;
+    textClass?: ClassValue;
+  }
+
+  let { children, class: className, icon: Icon, textClass: textClassName }: Props = $props();
+</script>
+
+<div class={className}>
+  <div class="flex min-h-[10vh] items-center">
+    {#if Icon}
+      <Icon class="text-5xl text-gray-600" />
+    {/if}
+  </div>
+  <p class={["text-3xl font-bold", textClassName]}>
+    {@render children()}
+  </p>
+</div>

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

@@ -0,0 +1,4 @@
+export { default as CategoryLabel } from "./CategoryLabel.svelte";
+export { default as DirectoryEntryLabel } from "./DirectoryEntryLabel.svelte";
+export { default as IconLabel } from "./IconLabel.svelte";
+export { default as TitleLabel } from "./TitleLabel.svelte";

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

@@ -0,0 +1,93 @@
+<script lang="ts">
+  import { CheckBox, RowVirtualizer } from "$lib/components/atoms";
+  import { SubCategories, type SelectedCategory } from "$lib/components/molecules";
+  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";
+
+  import IconMoreVert from "~icons/material-symbols/more-vert";
+
+  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;
+  }
+
+  let {
+    info,
+    onFileClick,
+    onFileRemoveClick,
+    onSubCategoryClick,
+    onSubCategoryCreateClick,
+    onSubCategoryMenuClick,
+    isFileRecursive = $bindable(),
+  }: Props = $props();
+
+  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(() => {
+    if (info.id === "root" || isFileRecursive === undefined) return;
+    if (lastCategoryId !== info.id) {
+      lastCategoryId = info.id;
+      lastIsFileRecursive = isFileRecursive;
+      return;
+    }
+    if (lastIsFileRecursive === isFileRecursive) return;
+
+    lastIsFileRecursive = isFileRecursive;
+    void updateCategoryInfo(info.id, { isFileRecursive });
+  });
+</script>
+
+<div class="space-y-4">
+  <div class="space-y-4 bg-white p-4">
+    {#if info.id !== "root"}
+      <p class="text-lg font-bold text-gray-800">하위 카테고리</p>
+    {/if}
+    <SubCategories
+      {info}
+      {onSubCategoryClick}
+      {onSubCategoryCreateClick}
+      {onSubCategoryMenuClick}
+      subCategoryMenuIcon={IconMoreVert}
+    />
+  </div>
+  {#if info.id !== "root"}
+    <div class="space-y-4 bg-white p-4">
+      <div class="flex items-center justify-between">
+        <p class="text-lg font-bold text-gray-800">파일</p>
+        <CheckBox bind:checked={isFileRecursive}>
+          <p class="font-medium">하위 카테고리의 파일</p>
+        </CheckBox>
+      </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

@@ -0,0 +1,28 @@
+<script lang="ts">
+  import { ActionEntryButton } from "$lib/components/atoms";
+  import { DirectoryEntryLabel } from "$lib/components/molecules";
+  import { getFileThumbnail } from "$lib/modules/file";
+  import type { CategoryFileInfo } from "$lib/modules/filesystem";
+  import type { SelectedFile } from "./service";
+
+  import IconClose from "~icons/material-symbols/close";
+
+  interface Props {
+    info: CategoryFileInfo;
+    onclick: (file: SelectedFile) => void;
+    onRemoveClick?: (file: SelectedFile) => void;
+  }
+
+  let { info, onclick, onRemoveClick }: Props = $props();
+
+  let thumbnail = $derived(getFileThumbnail(info));
+</script>
+
+<ActionEntryButton
+  class="h-12"
+  onclick={() => onclick(info)}
+  actionButtonIcon={onRemoveClick && IconClose}
+  onActionButtonClick={() => onRemoveClick?.(info)}
+>
+  <DirectoryEntryLabel type="file" thumbnail={$thumbnail} name={info.name} />
+</ActionEntryButton>

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

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

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

@@ -0,0 +1,4 @@
+export interface SelectedFile {
+  id: number;
+  name: string;
+}

src/lib/components/organisms/Gallery.svelte

@@ -0,0 +1,78 @@
+<script lang="ts">
+  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: SummarizedFileInfo[];
+    onFileClick?: (file: SummarizedFileInfo) => void;
+  }
+
+  let { files, onFileClick }: Props = $props();
+
+  type Row =
+    | { type: "header"; label: string }
+    | { type: "items"; files: SummarizedFileInfo[]; isLast: boolean };
+
+  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);
+
+        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>
+
+<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>
+    {/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}
+          사진 또는 동영상이 없어요.
+        {/if}
+      </p>
+    </div>
+  {/snippet}
+</RowVirtualizer>

src/lib/components/organisms/index.ts

@@ -0,0 +1,4 @@
+export * from "./Category";
+export { default as Category } from "./Category";
+export { default as Gallery } from "./Gallery.svelte";
+export * from "./modals";

src/lib/components/organisms/modals/CategoryCreateModal.svelte

@@ -0,0 +1,18 @@
+<script lang="ts">
+  import { TextInputModal } from "$lib/components/organisms";
+
+  interface Props {
+    isOpen: boolean;
+    onCreateClick: (name: string) => Promise<boolean>;
+  }
+
+  let { isOpen = $bindable(), onCreateClick }: Props = $props();
+</script>
+
+<TextInputModal
+  bind:isOpen
+  title="새 카테고리"
+  placeholder="카테고리 이름"
+  submitText="만들기"
+  onSubmitClick={onCreateClick}
+/>

src/lib/components/organisms/modals/ForceLoginModal.svelte

@@ -0,0 +1,22 @@
+<script lang="ts">
+  import { ActionModal } from "$lib/components/molecules";
+
+  interface Props {
+    isOpen: boolean;
+    oncancel?: () => void;
+    onLoginClick: () => void;
+  }
+
+  let { isOpen = $bindable(), oncancel, onLoginClick }: Props = $props();
+</script>
+
+<ActionModal
+  bind:isOpen
+  title="다른 디바이스에 이미 로그인되어 있어요."
+  cancelText="아니요"
+  {oncancel}
+  confirmText="네"
+  onConfirmClick={onLoginClick}
+>
+  <p>다른 디바이스에서는 로그아웃하고, 이 디바이스에서 로그인할까요?</p>
+</ActionModal>

src/lib/components/organisms/modals/RenameModal.svelte

@@ -0,0 +1,22 @@
+<script lang="ts">
+  import { TextInputModal } from "$lib/components/organisms";
+
+  interface Props {
+    isOpen: boolean;
+    onbeforeclose?: () => void;
+    onRenameClick: (newName: string) => Promise<boolean>;
+    originalName: string | undefined;
+  }
+
+  let { isOpen = $bindable(), onbeforeclose, onRenameClick, originalName }: Props = $props();
+</script>
+
+<TextInputModal
+  bind:isOpen
+  {onbeforeclose}
+  title="이름 바꾸기"
+  placeholder="이름"
+  defaultValue={originalName}
+  submitText="바꾸기"
+  onSubmitClick={onRenameClick}
+/>

src/lib/components/organisms/modals/TextInputModal.svelte

@@ -0,0 +1,42 @@
+<script lang="ts">
+  import { TextInput } from "$lib/components/atoms";
+  import { ActionModal, type ConfirmHandler } from "$lib/components/molecules";
+
+  interface Props {
+    defaultValue?: string;
+    isOpen: boolean;
+    onbeforeclose?: () => void;
+    onSubmitClick: (value: string) => ReturnType<ConfirmHandler>;
+    placeholder: string;
+    submitText: string;
+    title: string;
+  }
+
+  let {
+    defaultValue = "",
+    isOpen = $bindable(),
+    onbeforeclose,
+    onSubmitClick,
+    placeholder,
+    submitText,
+    title,
+  }: Props = $props();
+
+  let value = $state("");
+
+  $effect.pre(() => {
+    if (isOpen) {
+      value = defaultValue;
+    }
+  });
+</script>
+
+<ActionModal
+  bind:isOpen
+  {onbeforeclose}
+  {title}
+  confirmText={submitText}
+  onConfirmClick={() => onSubmitClick(value)}
+>
+  <TextInput bind:value {placeholder} class="mb-3" />
+</ActionModal>

src/lib/components/organisms/modals/index.ts

@@ -0,0 +1,4 @@
+export { default as CategoryCreateModal } from "./CategoryCreateModal.svelte";
+export { default as ForceLoginModal } from "./ForceLoginModal.svelte";
+export { default as RenameModal } from "./RenameModal.svelte";
+export { default as TextInputModal } from "./TextInputModal.svelte";

src/lib/hooks/callApi.ts

@@ -1,11 +0,0 @@
-export const callGetApi = async (input: RequestInfo, fetchInternal = fetch) => {
-  return await fetchInternal(input);
-};
-
-export const callPostApi = async <T>(input: RequestInfo, payload?: T, fetchInternal = fetch) => {
-  return await fetchInternal(input, {
-    method: "POST",
-    headers: { "Content-Type": "application/json" },
-    body: payload ? JSON.stringify(payload) : undefined,
-  });
-};

src/lib/hooks/index.ts

@@ -1,2 +0,0 @@
-export * from "./callApi";
-export * from "./gotoStateful";

src/lib/indexedDB/cacheIndex.ts

@@ -0,0 +1,28 @@
+import { Dexie, type EntityTable } from "dexie";
+
+export interface FileCacheIndex {
+  fileId: number;
+  cachedAt: Date;
+  lastRetrievedAt: Date;
+  size: number;
+}
+
+const cacheIndex = new Dexie("cacheIndex") as Dexie & {
+  fileCache: EntityTable<FileCacheIndex, "fileId">;
+};
+
+cacheIndex.version(1).stores({
+  fileCache: "fileId",
+});
+
+export const getFileCacheIndex = async () => {
+  return await cacheIndex.fileCache.toArray();
+};
+
+export const storeFileCacheIndex = async (fileCacheIndex: FileCacheIndex) => {
+  await cacheIndex.fileCache.put(fileCacheIndex);
+};
+
+export const deleteFileCacheIndex = async (fileId: number) => {
+  await cacheIndex.fileCache.delete(fileId);
+};

src/lib/indexedDB/filesystem.ts

@@ -0,0 +1,172 @@
+import { Dexie, type EntityTable } from "dexie";
+
+interface DirectoryInfo {
+  id: number;
+  parentId: DirectoryId;
+  name: string;
+}
+
+interface FileInfo {
+  id: number;
+  parentId: DirectoryId;
+  name: string;
+  contentType: string;
+  createdAt?: Date;
+  lastModifiedAt: Date;
+  categoryIds?: number[];
+}
+
+interface CategoryInfo {
+  id: number;
+  parentId: CategoryId;
+  name: string;
+  files?: { id: number; isRecursive: boolean }[];
+  isFileRecursive?: boolean;
+}
+
+const filesystem = new Dexie("filesystem") as Dexie & {
+  directory: EntityTable<DirectoryInfo, "id">;
+  file: EntityTable<FileInfo, "id">;
+  category: EntityTable<CategoryInfo, "id">;
+};
+
+filesystem
+  .version(3)
+  .stores({
+    directory: "id, parentId",
+    file: "id, parentId",
+    category: "id, parentId",
+  })
+  .upgrade(async (trx) => {
+    await trx
+      .table("category")
+      .toCollection()
+      .modify((category) => {
+        category.isFileRecursive = false;
+      });
+  });
+
+export const getDirectoryInfos = async (parentId: DirectoryId) => {
+  return await filesystem.directory.where({ parentId }).toArray();
+};
+
+export const getDirectoryInfo = async (id: number) => {
+  return await filesystem.directory.get(id);
+};
+
+export const storeDirectoryInfo = async (directoryInfo: DirectoryInfo) => {
+  await filesystem.directory.upsert(directoryInfo.id, { ...directoryInfo });
+};
+
+export const deleteDirectoryInfo = async (id: number) => {
+  await filesystem.directory.delete(id);
+};
+
+export const deleteDanglingDirectoryInfos = async (
+  parentId: DirectoryId,
+  validIds: Set<number>,
+) => {
+  await filesystem.directory
+    .where({ parentId })
+    .and((directory) => !validIds.has(directory.id))
+    .delete();
+};
+
+export const getAllFileInfos = async () => {
+  return await filesystem.file.toArray();
+};
+
+export const getFileInfos = async (parentId: DirectoryId) => {
+  return await filesystem.file.where({ parentId }).toArray();
+};
+
+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.upsert(fileInfo.id, { ...fileInfo });
+};
+
+export const deleteFileInfo = async (id: number) => {
+  await filesystem.file.delete(id);
+};
+
+export const deleteDanglingFileInfos = async (parentId: DirectoryId, validIds: Set<number>) => {
+  await filesystem.file
+    .where({ parentId })
+    .and((file) => !validIds.has(file.id))
+    .delete();
+};
+
+export const getCategoryInfos = async (parentId: CategoryId) => {
+  return await filesystem.category.where({ parentId }).toArray();
+};
+
+export const getCategoryInfo = async (id: number) => {
+  return await filesystem.category.get(id);
+};
+
+export const storeCategoryInfo = async (categoryInfo: CategoryInfo) => {
+  await filesystem.category.upsert(categoryInfo.id, { ...categoryInfo });
+};
+
+export const updateCategoryInfo = async (id: number, changes: { isFileRecursive?: boolean }) => {
+  await filesystem.category.update(id, changes);
+};
+
+export const deleteCategoryInfo = async (id: number) => {
+  await filesystem.category.delete(id);
+};
+
+export const deleteDanglingCategoryInfos = async (parentId: CategoryId, validIds: Set<number>) => {
+  await filesystem.category
+    .where({ parentId })
+    .and((category) => !validIds.has(category.id))
+    .delete();
+};
+
+export const cleanupDanglingInfos = async () => {
+  const validDirectoryIds: number[] = [];
+  const validFileIds: number[] = [];
+  const directoryQueue: DirectoryId[] = ["root"];
+
+  while (true) {
+    const directoryId = directoryQueue.shift();
+    if (!directoryId) break;
+
+    const [subDirectories, files] = await Promise.all([
+      filesystem.directory.where({ parentId: directoryId }).toArray(),
+      filesystem.file.where({ parentId: directoryId }).toArray(),
+    ]);
+    subDirectories.forEach(({ id }) => {
+      validDirectoryIds.push(id);
+      directoryQueue.push(id);
+    });
+    files.forEach(({ id }) => validFileIds.push(id));
+  }
+
+  const validCategoryIds: number[] = [];
+  const categoryQueue: CategoryId[] = ["root"];
+
+  while (true) {
+    const categoryId = categoryQueue.shift();
+    if (!categoryId) break;
+
+    const subCategories = await filesystem.category.where({ parentId: categoryId }).toArray();
+    subCategories.forEach(({ id }) => {
+      validCategoryIds.push(id);
+      categoryQueue.push(id);
+    });
+  }
+
+  await Promise.all([
+    filesystem.directory.where("id").noneOf(validDirectoryIds).delete(),
+    filesystem.file.where("id").noneOf(validFileIds).delete(),
+    filesystem.category.where("id").noneOf(validCategoryIds).delete(),
+  ]);
+};

src/lib/indexedDB/index.ts

@@ -0,0 +1,3 @@
+export * from "./cacheIndex";
+export * from "./filesystem";
+export * from "./keyStore";

src/lib/modules/crypto/rsa.ts

@@ -46,6 +46,56 @@ export const exportRSAKeyToBase64 = async (key: CryptoKey) => {
   return encodeToBase64((await exportRSAKey(key)).key);
 };
 
+export const importEncryptionKeyPairFromBase64 = async (
+  encryptKeyBase64: string,
+  decryptKeyBase64: string,
+) => {
+  const algorithm: RsaHashedImportParams = {
+    name: "RSA-OAEP",
+    hash: "SHA-256",
+  };
+  const encryptKey = await window.crypto.subtle.importKey(
+    "spki",
+    decodeFromBase64(encryptKeyBase64),
+    algorithm,
+    true,
+    ["encrypt", "wrapKey"],
+  );
+  const decryptKey = await window.crypto.subtle.importKey(
+    "pkcs8",
+    decodeFromBase64(decryptKeyBase64),
+    algorithm,
+    true,
+    ["decrypt", "unwrapKey"],
+  );
+  return { encryptKey, decryptKey };
+};
+
+export const importSigningKeyPairFromBase64 = async (
+  signKeyBase64: string,
+  verifyKeyBase64: string,
+) => {
+  const algorithm: RsaHashedImportParams = {
+    name: "RSA-PSS",
+    hash: "SHA-256",
+  };
+  const signKey = await window.crypto.subtle.importKey(
+    "pkcs8",
+    decodeFromBase64(signKeyBase64),
+    algorithm,
+    true,
+    ["sign"],
+  );
+  const verifyKey = await window.crypto.subtle.importKey(
+    "spki",
+    decodeFromBase64(verifyKeyBase64),
+    algorithm,
+    true,
+    ["verify"],
+  );
+  return { signKey, verifyKey };
+};
+
 export const makeRSAKeyNonextractable = async (key: CryptoKey) => {
   const { key: exportedKey, format } = await exportRSAKey(key);
   return await window.crypto.subtle.importKey(

src/lib/modules/file.ts

@@ -1,89 +0,0 @@
-import { writable, type Writable } from "svelte/store";
-import { callGetApi } from "$lib/hooks";
-import { unwrapDataKey, decryptString } from "$lib/modules/crypto";
-import type { DirectoryInfoResponse, FileInfoResponse } from "$lib/server/schemas";
-import {
-  directoryInfoStore,
-  fileInfoStore,
-  type DirectoryInfo,
-  type FileInfo,
-} from "$lib/stores/file";
-
-const fetchDirectoryInfo = async (
-  directoryId: "root" | number,
-  masterKey: CryptoKey,
-  infoStore: Writable<DirectoryInfo | null>,
-) => {
-  const res = await callGetApi(`/api/directory/${directoryId}`);
-  if (!res.ok) throw new Error("Failed to fetch directory information");
-  const { metadata, subDirectories, files }: DirectoryInfoResponse = await res.json();
-
-  let newInfo: DirectoryInfo;
-  if (directoryId === "root") {
-    newInfo = {
-      id: "root",
-      subDirectoryIds: subDirectories,
-      fileIds: files,
-    };
-  } else {
-    const { dataKey } = await unwrapDataKey(metadata!.dek, masterKey);
-    newInfo = {
-      id: directoryId,
-      dataKey,
-      dataKeyVersion: new Date(metadata!.dekVersion),
-      name: await decryptString(metadata!.name, metadata!.nameIv, dataKey),
-      subDirectoryIds: subDirectories,
-      fileIds: files,
-    };
-  }
-
-  infoStore.update(() => newInfo);
-};
-
-export const getDirectoryInfo = (directoryId: "root" | number, masterKey: CryptoKey) => {
-  // TODO: MEK rotation
-
-  let info = directoryInfoStore.get(directoryId);
-  if (!info) {
-    info = writable(null);
-    directoryInfoStore.set(directoryId, info);
-  }
-
-  fetchDirectoryInfo(directoryId, masterKey, info);
-  return info;
-};
-
-const fetchFileInfo = async (
-  fileId: number,
-  masterKey: CryptoKey,
-  infoStore: Writable<FileInfo | null>,
-) => {
-  const res = await callGetApi(`/api/file/${fileId}`);
-  if (!res.ok) throw new Error("Failed to fetch file information");
-  const metadata: FileInfoResponse = await res.json();
-
-  const { dataKey } = await unwrapDataKey(metadata.dek, masterKey);
-  const newInfo: FileInfo = {
-    id: fileId,
-    dataKey,
-    dataKeyVersion: new Date(metadata.dekVersion),
-    contentType: metadata.contentType,
-    contentIv: metadata.contentIv,
-    name: await decryptString(metadata.name, metadata.nameIv, dataKey),
-  };
-
-  infoStore.update(() => newInfo);
-};
-
-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, masterKey, info);
-  return info;
-};

src/lib/modules/file/cache.ts

@@ -0,0 +1,50 @@
+import {
+  getFileCacheIndex as getFileCacheIndexFromIndexedDB,
+  storeFileCacheIndex,
+  deleteFileCacheIndex,
+  type FileCacheIndex,
+} from "$lib/indexedDB";
+import { readFile, writeFile, deleteFile } from "$lib/modules/opfs";
+
+const fileCacheIndex = new Map<number, FileCacheIndex>();
+
+export const prepareFileCache = async () => {
+  for (const cache of await getFileCacheIndexFromIndexedDB()) {
+    fileCacheIndex.set(cache.fileId, cache);
+  }
+};
+
+export const getFileCacheIndex = () => {
+  return Array.from(fileCacheIndex.values());
+};
+
+export const getFileCache = async (fileId: number) => {
+  const cacheIndex = fileCacheIndex.get(fileId);
+  if (!cacheIndex) return null;
+
+  cacheIndex.lastRetrievedAt = new Date();
+  storeFileCacheIndex(cacheIndex); // Intended
+  return await readFile(`/cache/${fileId}`);
+};
+
+export const storeFileCache = async (fileId: number, fileBuffer: ArrayBuffer) => {
+  const now = new Date();
+  await writeFile(`/cache/${fileId}`, fileBuffer);
+
+  const cacheIndex: FileCacheIndex = {
+    fileId,
+    cachedAt: now,
+    lastRetrievedAt: now,
+    size: fileBuffer.byteLength,
+  };
+  fileCacheIndex.set(fileId, cacheIndex);
+  await storeFileCacheIndex(cacheIndex);
+};
+
+export const deleteFileCache = async (fileId: number) => {
+  if (!fileCacheIndex.has(fileId)) return;
+
+  fileCacheIndex.delete(fileId);
+  await deleteFile(`/cache/${fileId}`);
+  await deleteFileCacheIndex(fileId);
+};

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/index.ts

@@ -0,0 +1,4 @@
+export * from "./cache";
+export * from "./download.svelte";
+export * from "./thumbnail";
+export * from "./upload.svelte";

src/lib/modules/file/thumbnail.ts

@@ -0,0 +1,90 @@
+import { LRUCache } from "lru-cache";
+import { writable, type Writable } from "svelte/store";
+import { browser } from "$app/environment";
+import { decryptData } from "$lib/modules/crypto";
+import type { SummarizedFileInfo } from "$lib/modules/filesystem";
+import { readFile, writeFile, deleteFile, deleteDirectory } from "$lib/modules/opfs";
+import { getThumbnailUrl } from "$lib/modules/thumbnail";
+import { isTRPCClientError, trpc } from "$trpc/client";
+
+const loadedThumbnails = new LRUCache<number, Writable<string>>({ max: 100 });
+const loadingThumbnails = new Map<number, Writable<string | undefined>>();
+
+const fetchFromOpfs = async (fileId: number) => {
+  const thumbnailBuffer = await readFile(`/thumbnail/file/${fileId}`);
+  if (thumbnailBuffer) {
+    return getThumbnailUrl(thumbnailBuffer);
+  }
+};
+
+const fetchFromServer = async (fileId: number, dataKey: CryptoKey) => {
+  try {
+    const [thumbnailEncrypted, { contentIv: thumbnailEncryptedIv }] = await Promise.all([
+      fetch(`/api/file/${fileId}/thumbnail/download`),
+      trpc().file.thumbnail.query({ id: fileId }),
+    ]);
+    const thumbnailBuffer = await decryptData(
+      await thumbnailEncrypted.arrayBuffer(),
+      thumbnailEncryptedIv,
+      dataKey,
+    );
+
+    void writeFile(`/thumbnail/file/${fileId}`, thumbnailBuffer);
+    return getThumbnailUrl(thumbnailBuffer);
+  } catch (e) {
+    if (isTRPCClientError(e) && e.data?.code === "NOT_FOUND") {
+      return null;
+    }
+    throw e;
+  }
+};
+
+export const getFileThumbnail = (file: SummarizedFileInfo) => {
+  if (
+    !browser ||
+    !(file.contentType.startsWith("image/") || file.contentType.startsWith("video/"))
+  ) {
+    return undefined;
+  }
+
+  const thumbnail = loadedThumbnails.get(file.id);
+  if (thumbnail) return thumbnail;
+
+  let loadingThumbnail = loadingThumbnails.get(file.id);
+  if (loadingThumbnail) return loadingThumbnail;
+
+  loadingThumbnail = writable(undefined);
+  loadingThumbnails.set(file.id, loadingThumbnail);
+
+  fetchFromOpfs(file.id)
+    .then((thumbnail) => thumbnail ?? (file.dataKey && fetchFromServer(file.id, file.dataKey.key)))
+    .then((thumbnail) => {
+      if (thumbnail) {
+        loadingThumbnail.set(thumbnail);
+        loadedThumbnails.set(file.id, loadingThumbnail as Writable<string>);
+      }
+      loadingThumbnails.delete(file.id);
+    });
+  return loadingThumbnail;
+};
+
+export const storeFileThumbnailCache = async (fileId: number, thumbnailBuffer: ArrayBuffer) => {
+  await writeFile(`/thumbnail/file/${fileId}`, thumbnailBuffer);
+
+  const oldThumbnail = loadedThumbnails.get(fileId);
+  if (oldThumbnail) {
+    oldThumbnail.set(getThumbnailUrl(thumbnailBuffer));
+  } else {
+    loadedThumbnails.set(fileId, writable(getThumbnailUrl(thumbnailBuffer)));
+  }
+};
+
+export const deleteFileThumbnailCache = async (fileId: number) => {
+  loadedThumbnails.delete(fileId);
+  await deleteFile(`/thumbnail/file/${fileId}`);
+};
+
+export const deleteAllFileThumbnailCaches = async () => {
+  loadedThumbnails.clear();
+  await deleteDirectory(`/thumbnail/file`);
+};

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

@@ -0,0 +1,269 @@
+import axios from "axios";
+import ExifReader from "exifreader";
+import { limitFunction } from "p-limit";
+import {
+  encodeToBase64,
+  generateDataKey,
+  wrapDataKey,
+  encryptData,
+  encryptString,
+  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 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();
+    const fileSigned = encodeToBase64(await signMessageHmac(fileBuffer, hmacSecret.secret));
+
+    const files = await trpc().file.listByHash.query({
+      hskVersion: hmacSecret.version,
+      contentHmac: fileSigned,
+    });
+    if (files.length === 0 || (await onDuplicate())) {
+      return { fileBuffer, fileSigned };
+    } else {
+      return {};
+    }
+  },
+  { concurrency: 1 },
+);
+
+const getFileType = (file: File) => {
+  if (file.type) return file.type;
+  if (file.name.endsWith(".heic")) return "image/heic";
+  throw new Error("Unknown file type");
+};
+
+const extractExifDateTime = (fileBuffer: ArrayBuffer) => {
+  const exif = ExifReader.load(fileBuffer);
+  const dateTimeOriginal = exif["DateTimeOriginal"]?.description;
+  const offsetTimeOriginal = exif["OffsetTimeOriginal"]?.description;
+  if (!dateTimeOriginal) return undefined;
+
+  const [date, time] = dateTimeOriginal.split(" ");
+  if (!date || !time) return undefined;
+
+  const [year, month, day] = date.split(":").map(Number);
+  const [hour, minute, second] = time.split(":").map(Number);
+  if (!year || !month || !day || !hour || !minute || !second) return undefined;
+
+  if (!offsetTimeOriginal) {
+    // No timezone information.. Assume local timezone
+    return new Date(year, month - 1, day, hour, minute, second);
+  }
+
+  const offsetSign = offsetTimeOriginal[0] === "+" ? 1 : -1;
+  const [offsetHour, offsetMinute] = offsetTimeOriginal.slice(1).split(":").map(Number);
+
+  const utcDate = Date.UTC(year, month - 1, day, hour, minute, second);
+  const offsetMs = offsetSign * ((offsetHour ?? 0) * 60 + (offsetMinute ?? 0)) * 60 * 1000;
+  return new Date(utcDate - offsetMs);
+};
+
+const encryptFile = limitFunction(
+  async (state: FileUploadState, file: File, fileBuffer: ArrayBuffer, masterKey: MasterKey) => {
+    state.status = "encrypting";
+
+    const fileType = getFileType(file);
+
+    let createdAt;
+    if (fileType.startsWith("image/")) {
+      createdAt = extractExifDateTime(fileBuffer);
+    }
+
+    const { dataKey, dataKeyVersion } = await generateDataKey();
+    const dataKeyWrapped = await wrapDataKey(dataKey, masterKey.key);
+
+    const fileEncrypted = await encryptData(fileBuffer, dataKey);
+    const fileEncryptedHash = encodeToBase64(await digestMessage(fileEncrypted.ciphertext));
+
+    const nameEncrypted = await encryptString(file.name, dataKey);
+    const createdAtEncrypted =
+      createdAt && (await encryptString(createdAt.getTime().toString(), dataKey));
+    const lastModifiedAtEncrypted = await encryptString(file.lastModified.toString(), dataKey);
+
+    const thumbnail = await generateThumbnail(fileBuffer, fileType);
+    const thumbnailBuffer = await thumbnail?.arrayBuffer();
+    const thumbnailEncrypted = thumbnailBuffer && (await encryptData(thumbnailBuffer, dataKey));
+
+    state.status = "upload-pending";
+
+    return {
+      dataKeyWrapped,
+      dataKeyVersion,
+      fileType,
+      fileEncrypted,
+      fileEncryptedHash,
+      nameEncrypted,
+      createdAtEncrypted,
+      lastModifiedAtEncrypted,
+      thumbnail: thumbnailEncrypted && { plaintext: thumbnailBuffer, ...thumbnailEncrypted },
+    };
+  },
+  { concurrency: 4 },
+);
+
+const requestFileUpload = limitFunction(
+  async (state: FileUploadState, form: FormData, thumbnailForm: FormData | null) => {
+    state.status = "uploading";
+
+    const res = await axios.post("/api/file/upload", form, {
+      onUploadProgress: ({ progress, rate, estimated }) => {
+        state.progress = progress;
+        state.rate = rate;
+        state.estimated = estimated;
+      },
+    });
+    const { file }: FileUploadResponse = res.data;
+
+    if (thumbnailForm) {
+      try {
+        await axios.post(`/api/file/${file}/thumbnail/upload`, thumbnailForm);
+      } catch (e) {
+        // TODO
+        console.error(e);
+      }
+    }
+
+    state.status = "uploaded";
+
+    return { fileId: file };
+  },
+  { concurrency: 1 },
+);
+
+export const uploadFile = async (
+  file: File,
+  parentId: "root" | number,
+  hmacSecret: HmacSecret,
+  masterKey: MasterKey,
+  onDuplicate: () => Promise<boolean>,
+) => {
+  uploadingFiles.push({
+    name: file.name,
+    parentId,
+    status: "queued",
+  });
+  const state = uploadingFiles.at(-1)!;
+
+  return await scheduler.schedule(file.size, async () => {
+    state.status = "encryption-pending";
+
+    try {
+      const { fileBuffer, fileSigned } = await requestDuplicateFileScan(
+        file,
+        hmacSecret,
+        onDuplicate,
+      );
+      if (!fileBuffer || !fileSigned) {
+        state.status = "canceled";
+        uploadingFiles = uploadingFiles.filter((file) => file !== state);
+        return undefined;
+      }
+
+      const {
+        dataKeyWrapped,
+        dataKeyVersion,
+        fileType,
+        fileEncrypted,
+        fileEncryptedHash,
+        nameEncrypted,
+        createdAtEncrypted,
+        lastModifiedAtEncrypted,
+        thumbnail,
+      } = await encryptFile(state, file, fileBuffer, masterKey);
+
+      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);
+
+      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/category.ts

@@ -0,0 +1,121 @@
+import * as IndexedDB from "$lib/indexedDB";
+import { trpc, isTRPCClientError } from "$trpc/client";
+import { FilesystemCache, decryptFileMetadata, decryptCategoryMetadata } from "./internal.svelte";
+import type { CategoryInfo, MaybeCategoryInfo } from "./types";
+
+const cache = new FilesystemCache<CategoryId, MaybeCategoryInfo>({
+  async fetchFromIndexedDB(id) {
+    const [category, subCategories] = await Promise.all([
+      id !== "root" ? IndexedDB.getCategoryInfo(id) : undefined,
+      IndexedDB.getCategoryInfos(id),
+    ]);
+    const files = category?.files
+      ? await Promise.all(
+          category.files.map(async (file) => {
+            const fileInfo = await IndexedDB.getFileInfo(file.id);
+            return fileInfo
+              ? {
+                  id: file.id,
+                  parentId: fileInfo.parentId,
+                  contentType: fileInfo.contentType,
+                  name: fileInfo.name,
+                  createdAt: fileInfo.createdAt,
+                  lastModifiedAt: fileInfo.lastModifiedAt,
+                  isRecursive: file.isRecursive,
+                }
+              : undefined;
+          }),
+        )
+      : undefined;
+
+    if (id === "root") {
+      return {
+        id,
+        exists: true,
+        subCategories,
+      };
+    } else if (category) {
+      return {
+        id,
+        exists: true,
+        parentId: category.parentId,
+        name: category.name,
+        subCategories,
+        files: files?.filter((file) => !!file) ?? [],
+        isFileRecursive: category.isFileRecursive ?? false,
+      };
+    }
+  },
+
+  async fetchFromServer(id, cachedInfo, masterKey) {
+    try {
+      const category = await trpc().category.get.query({ id, recurse: true });
+      const [subCategories, files, metadata] = await Promise.all([
+        Promise.all(
+          category.subCategories.map(async (category) => ({
+            id: category.id,
+            parentId: id,
+            ...(await decryptCategoryMetadata(category, masterKey)),
+          })),
+        ),
+        category.files &&
+          Promise.all(
+            category.files.map(async (file) => ({
+              id: file.id,
+              parentId: file.parent,
+              contentType: file.contentType,
+              isRecursive: file.isRecursive,
+              ...(await decryptFileMetadata(file, masterKey)),
+            })),
+          ),
+        category.metadata && decryptCategoryMetadata(category.metadata, masterKey),
+      ]);
+
+      return storeToIndexedDB(
+        id !== "root"
+          ? {
+              id,
+              parentId: category.metadata!.parent,
+              subCategories,
+              files: files!,
+              isFileRecursive: cachedInfo?.isFileRecursive ?? false,
+              ...metadata!,
+            }
+          : { id, subCategories },
+      );
+    } catch (e) {
+      if (isTRPCClientError(e) && e.data?.code === "NOT_FOUND") {
+        await IndexedDB.deleteCategoryInfo(id as number);
+        return { id, exists: false };
+      }
+      throw e;
+    }
+  },
+});
+
+const storeToIndexedDB = (info: CategoryInfo) => {
+  if (info.id !== "root") {
+    void IndexedDB.storeCategoryInfo(info);
+
+    // TODO: Bulk Upsert
+    new Map(info.files.map((file) => [file.id, file])).forEach((file) => {
+      void IndexedDB.storeFileInfo(file);
+    });
+  }
+
+  // TODO: Bulk Upsert
+  info.subCategories.forEach((category) => {
+    void IndexedDB.storeCategoryInfo(category);
+  });
+
+  void IndexedDB.deleteDanglingCategoryInfos(
+    info.id,
+    new Set(info.subCategories.map(({ id }) => id)),
+  );
+
+  return { ...info, exists: true as const };
+};
+
+export const getCategoryInfo = async (id: CategoryId, masterKey: CryptoKey) => {
+  return await cache.get(id, masterKey);
+};

src/lib/modules/filesystem/directory.ts

@@ -0,0 +1,102 @@
+import * as IndexedDB from "$lib/indexedDB";
+import { trpc, isTRPCClientError } from "$trpc/client";
+import { FilesystemCache, decryptDirectoryMetadata, decryptFileMetadata } from "./internal.svelte";
+import type { DirectoryInfo, MaybeDirectoryInfo } from "./types";
+
+const cache = new FilesystemCache<DirectoryId, MaybeDirectoryInfo>({
+  async fetchFromIndexedDB(id) {
+    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,
+        subDirectories,
+        files,
+      };
+    } else if (directory) {
+      return {
+        id,
+        exists: true,
+        parentId: directory.parentId,
+        name: directory.name,
+        subDirectories,
+        files,
+      };
+    }
+  },
+
+  async fetchFromServer(id, _cachedInfo, masterKey) {
+    try {
+      const directory = await trpc().directory.get.query({ id });
+      const [subDirectories, files, metadata] = await Promise.all([
+        Promise.all(
+          directory.subDirectories.map(async (directory) => ({
+            id: directory.id,
+            parentId: id,
+            ...(await decryptDirectoryMetadata(directory, masterKey)),
+          })),
+        ),
+        Promise.all(
+          directory.files.map(async (file) => ({
+            id: file.id,
+            parentId: id,
+            contentType: file.contentType,
+            ...(await decryptFileMetadata(file, masterKey)),
+          })),
+        ),
+        directory.metadata && decryptDirectoryMetadata(directory.metadata, masterKey),
+      ]);
+
+      return storeToIndexedDB(
+        id !== "root"
+          ? {
+              id,
+              parentId: directory.metadata!.parent,
+              subDirectories,
+              files,
+              ...metadata!,
+            }
+          : { id, subDirectories, files },
+      );
+    } catch (e) {
+      if (isTRPCClientError(e) && e.data?.code === "NOT_FOUND") {
+        await IndexedDB.deleteDirectoryInfo(id as number);
+        return { id, exists: false as const };
+      }
+      throw e;
+    }
+  },
+});
+
+const storeToIndexedDB = (info: DirectoryInfo) => {
+  if (info.id !== "root") {
+    void IndexedDB.storeDirectoryInfo(info);
+  }
+
+  // TODO: Bulk Upsert
+  info.subDirectories.forEach((subDirectory) => {
+    void IndexedDB.storeDirectoryInfo(subDirectory);
+  });
+
+  // TODO: Bulk Upsert
+  info.files.forEach((file) => {
+    void IndexedDB.storeFileInfo(file);
+  });
+
+  void IndexedDB.deleteDanglingDirectoryInfos(
+    info.id,
+    new Set(info.subDirectories.map(({ id }) => id)),
+  );
+  void IndexedDB.deleteDanglingFileInfos(info.id, new Set(info.files.map(({ id }) => id)));
+
+  return { ...info, exists: true as const };
+};
+
+export const getDirectoryInfo = async (id: DirectoryId, masterKey: CryptoKey) => {
+  return await cache.get(id, masterKey);
+};

src/lib/modules/filesystem/file.ts

@@ -0,0 +1,177 @@
+import * as IndexedDB from "$lib/indexedDB";
+import { trpc, isTRPCClientError } from "$trpc/client";
+import { FilesystemCache, decryptFileMetadata, decryptCategoryMetadata } from "./internal.svelte";
+import type { FileInfo, MaybeFileInfo } from "./types";
+
+const cache = new FilesystemCache<number, MaybeFileInfo>({
+  async fetchFromIndexedDB(id) {
+    const file = await IndexedDB.getFileInfo(id);
+    const categories = file?.categoryIds
+      ? await Promise.all(
+          file.categoryIds.map(async (categoryId) => {
+            const category = await IndexedDB.getCategoryInfo(categoryId);
+            return category
+              ? { id: category.id, parentId: category.parentId, name: category.name }
+              : undefined;
+          }),
+        )
+      : undefined;
+
+    if (file) {
+      return {
+        id,
+        exists: true,
+        parentId: file.parentId,
+        contentType: file.contentType,
+        name: file.name,
+        createdAt: file.createdAt,
+        lastModifiedAt: file.lastModifiedAt,
+        categories: categories?.filter((category) => !!category) ?? [],
+      };
+    }
+  },
+
+  async fetchFromServer(id, _cachedInfo, masterKey) {
+    try {
+      const file = await trpc().file.get.query({ id });
+      const [categories, metadata] = await Promise.all([
+        Promise.all(
+          file.categories.map(async (category) => ({
+            id: category.id,
+            parentId: category.parent,
+            ...(await decryptCategoryMetadata(category, masterKey)),
+          })),
+        ),
+        decryptFileMetadata(file, masterKey),
+      ]);
+
+      return storeToIndexedDB({
+        id,
+        parentId: file.parent,
+        dataKey: metadata.dataKey,
+        contentType: file.contentType,
+        contentIv: file.contentIv,
+        name: metadata.name,
+        createdAt: metadata.createdAt,
+        lastModifiedAt: metadata.lastModifiedAt,
+        categories,
+      });
+    } catch (e) {
+      if (isTRPCClientError(e) && e.data?.code === "NOT_FOUND") {
+        await IndexedDB.deleteFileInfo(id);
+        return { id, exists: false as const };
+      }
+      throw e;
+    }
+  },
+
+  async bulkFetchFromIndexedDB(ids) {
+    const files = await IndexedDB.bulkGetFileInfos([...ids]);
+    const categories = await Promise.all(
+      files.map(async (file) =>
+        file?.categoryIds
+          ? await Promise.all(
+              file.categoryIds.map(async (categoryId) => {
+                const category = await IndexedDB.getCategoryInfo(categoryId);
+                return category
+                  ? { id: category.id, parentId: category.parentId, name: category.name }
+                  : undefined;
+              }),
+            )
+          : undefined,
+      ),
+    );
+
+    return new Map(
+      files
+        .filter((file) => !!file)
+        .map((file, index) => [
+          file.id,
+          {
+            ...file,
+            exists: true,
+            categories: categories[index]?.filter((category) => !!category) ?? [],
+          },
+        ]),
+    );
+  },
+
+  async bulkFetchFromServer(ids, masterKey) {
+    const idsArray = [...ids.keys()];
+
+    const filesRaw = await trpc().file.bulkGet.query({ ids: idsArray });
+    const files = await Promise.all(
+      filesRaw.map(async ({ id, categories: categoriesRaw, ...metadataRaw }) => {
+        const [categories, metadata] = await Promise.all([
+          Promise.all(
+            categoriesRaw.map(async (category) => ({
+              id: category.id,
+              parentId: category.parent,
+              ...(await decryptCategoryMetadata(category, masterKey)),
+            })),
+          ),
+          decryptFileMetadata(metadataRaw, masterKey),
+        ]);
+
+        return {
+          id,
+          exists: true as const,
+          parentId: metadataRaw.parent,
+          contentType: metadataRaw.contentType,
+          contentIv: metadataRaw.contentIv,
+          categories,
+          ...metadata,
+        };
+      }),
+    );
+
+    const existingIds = new Set(filesRaw.map(({ id }) => id));
+
+    return new Map<number, MaybeFileInfo>([
+      ...bulkStoreToIndexedDB(files),
+      ...idsArray
+        .filter((id) => !existingIds.has(id))
+        .map((id) => [id, { id, exists: false }] as const),
+    ]);
+  },
+});
+
+const storeToIndexedDB = (info: FileInfo) => {
+  void IndexedDB.storeFileInfo({
+    ...info,
+    categoryIds: info.categories.map(({ id }) => id),
+  });
+
+  info.categories.forEach((category) => {
+    void IndexedDB.storeCategoryInfo(category);
+  });
+
+  return { ...info, exists: true as const };
+};
+
+const bulkStoreToIndexedDB = (infos: FileInfo[]) => {
+  // TODO: Bulk Upsert
+  infos.forEach((info) => {
+    void IndexedDB.storeFileInfo({
+      ...info,
+      categoryIds: info.categories.map(({ id }) => id),
+    });
+  });
+
+  // TODO: Bulk Upsert
+  new Map(
+    infos.flatMap(({ categories }) => categories).map((category) => [category.id, category]),
+  ).forEach((category) => {
+    void IndexedDB.storeCategoryInfo(category);
+  });
+
+  return infos.map((info) => [info.id, { ...info, exists: true }] as const);
+};
+
+export const getFileInfo = async (id: number, masterKey: CryptoKey) => {
+  return await cache.get(id, masterKey);
+};
+
+export const bulkGetFileInfo = async (ids: number[], masterKey: CryptoKey) => {
+  return await cache.bulkGet(new Set(ids), masterKey);
+};

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 +1,168 @@
+import { untrack } from "svelte";
+import { unwrapDataKey, decryptString } from "$lib/modules/crypto";
+
+interface FilesystemCacheOptions<K, V> {
+  fetchFromIndexedDB: (key: K) => Promise<V | undefined>;
+  fetchFromServer: (key: K, cachedValue: V | undefined, masterKey: CryptoKey) => Promise<V>;
+  bulkFetchFromIndexedDB?: (keys: Set<K>) => Promise<Map<K, V>>;
+  bulkFetchFromServer?: (
+    keys: Map<K, { cachedValue: V | undefined }>,
+    masterKey: CryptoKey,
+  ) => Promise<Map<K, V>>;
+}
+
+export class FilesystemCache<K, V extends object> {
+  private map = new Map<K, { value?: V; promise?: Promise<V> }>();
+
+  constructor(private readonly options: FilesystemCacheOptions<K, V>) {}
+
+  get(key: K, masterKey: CryptoKey) {
+    return untrack(() => {
+      let state = this.map.get(key);
+      if (state?.promise) return state.value ?? state.promise;
+
+      const { promise: newPromise, resolve } = Promise.withResolvers<V>();
+
+      if (!state) {
+        const newState = $state({});
+        state = newState;
+        this.map.set(key, newState);
+      }
+
+      state.promise = newPromise;
+
+      (state.value
+        ? Promise.resolve(state.value)
+        : this.options.fetchFromIndexedDB(key).then((loadedInfo) => {
+            if (loadedInfo) {
+              state.value = loadedInfo;
+              resolve(state.value);
+            }
+            return loadedInfo;
+          })
+      )
+        .then((cachedInfo) => this.options.fetchFromServer(key, cachedInfo, masterKey))
+        .then((loadedInfo) => {
+          if (state.value) {
+            Object.assign(state.value, loadedInfo);
+          } else {
+            state.value = loadedInfo;
+          }
+          resolve(state.value);
+        })
+        .finally(() => {
+          state.promise = undefined;
+        });
+
+      return newPromise;
+    });
+  }
+
+  bulkGet(keys: Set<K>, masterKey: CryptoKey) {
+    return untrack(() => {
+      const newPromises = new Map(
+        keys
+          .keys()
+          .filter((key) => this.map.get(key)?.promise === undefined)
+          .map((key) => [key, Promise.withResolvers<V>()]),
+      );
+      newPromises.forEach(({ promise }, key) => {
+        const state = this.map.get(key);
+        if (state) {
+          state.promise = promise;
+        } else {
+          const newState = $state({ promise });
+          this.map.set(key, newState);
+        }
+      });
+
+      const resolve = (loadedInfos: Map<K, V>) => {
+        loadedInfos.forEach((loadedInfo, key) => {
+          const state = this.map.get(key)!;
+          if (state.value) {
+            Object.assign(state.value, loadedInfo);
+          } else {
+            state.value = loadedInfo;
+          }
+          newPromises.get(key)!.resolve(state.value);
+        });
+        return loadedInfos;
+      };
+
+      this.options.bulkFetchFromIndexedDB!(
+        new Set(newPromises.keys().filter((key) => this.map.get(key)!.value === undefined)),
+      )
+        .then(resolve)
+        .then(() =>
+          this.options.bulkFetchFromServer!(
+            new Map(
+              newPromises.keys().map((key) => [key, { cachedValue: this.map.get(key)!.value }]),
+            ),
+            masterKey,
+          ),
+        )
+        .then(resolve)
+        .finally(() => {
+          newPromises.forEach((_, key) => {
+            this.map.get(key)!.promise = undefined;
+          });
+        });
+
+      return Promise.all(
+        keys
+          .keys()
+          .filter((key) => this.map.get(key)!.value === undefined)
+          .map((key) => this.map.get(key)!.promise!),
+      ).then(() => new Map(keys.keys().map((key) => [key, this.map.get(key)!.value!] as const)));
+    });
+  }
+}
+
+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 +1,77 @@
+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 MaybeDirectoryInfo =
+  | (DirectoryInfo & { exists: true })
+  | ({ id: DirectoryId; exists: false } & AllUndefined<Omit<DirectoryInfo, "id">>);
+
+export type SubDirectoryInfo = Omit<LocalDirectoryInfo, "subDirectories" | "files">;
+
+export interface FileInfo {
+  id: number;
+  parentId: DirectoryId;
+  dataKey?: DataKey;
+  contentType: string;
+  contentIv?: string;
+  name: string;
+  createdAt?: Date;
+  lastModifiedAt: Date;
+  categories: FileCategoryInfo[];
+}
+
+export type MaybeFileInfo =
+  | (FileInfo & { exists: true })
+  | ({ id: number; exists: false } & AllUndefined<Omit<FileInfo, "id">>);
+
+export type SummarizedFileInfo = Omit<FileInfo, "contentIv" | "categories">;
+export type CategoryFileInfo = SummarizedFileInfo & { isRecursive: boolean };
+
+interface LocalCategoryInfo {
+  id: number;
+  parentId: DirectoryId;
+  dataKey?: DataKey;
+  name: string;
+  subCategories: SubCategoryInfo[];
+  files: CategoryFileInfo[];
+  isFileRecursive: boolean;
+}
+
+interface RootCategoryInfo {
+  id: "root";
+  parentId?: undefined;
+  dataKey?: undefined;
+  name?: undefined;
+  subCategories: SubCategoryInfo[];
+  files?: undefined;
+  isFileRecursive?: undefined;
+}
+
+export type CategoryInfo = LocalCategoryInfo | RootCategoryInfo;
+export type MaybeCategoryInfo =
+  | (CategoryInfo & { exists: true })
+  | ({ id: CategoryId; exists: false } & AllUndefined<Omit<CategoryInfo, "id">>);
+
+export type SubCategoryInfo = Omit<
+  LocalCategoryInfo,
+  "subCategories" | "files" | "isFileRecursive"
+>;
+export type FileCategoryInfo = Omit<SubCategoryInfo, "dataKey">;

src/lib/modules/key.ts

@@ -0,0 +1,65 @@
+import { z } from "zod";
+import { storeClientKey } from "$lib/indexedDB";
+import type { ClientKeys } from "$lib/stores";
+
+const serializedClientKeysSchema = z.intersection(
+  z.object({
+    generator: z.literal("ArkVault"),
+    exportedAt: z.iso.datetime(),
+  }),
+  z.object({
+    version: z.literal(1),
+    encryptKey: z.base64().nonempty(),
+    decryptKey: z.base64().nonempty(),
+    signKey: z.base64().nonempty(),
+    verifyKey: z.base64().nonempty(),
+  }),
+);
+
+type SerializedClientKeys = z.infer<typeof serializedClientKeysSchema>;
+
+type DeserializedClientKeys = {
+  encryptKeyBase64: string;
+  decryptKeyBase64: string;
+  signKeyBase64: string;
+  verifyKeyBase64: string;
+};
+
+export const serializeClientKeys = ({
+  encryptKeyBase64,
+  decryptKeyBase64,
+  signKeyBase64,
+  verifyKeyBase64,
+}: DeserializedClientKeys) => {
+  return JSON.stringify({
+    version: 1,
+    generator: "ArkVault",
+    exportedAt: new Date().toISOString(),
+    encryptKey: encryptKeyBase64,
+    decryptKey: decryptKeyBase64,
+    signKey: signKeyBase64,
+    verifyKey: verifyKeyBase64,
+  } satisfies SerializedClientKeys);
+};
+
+export const deserializeClientKeys = (serialized: string) => {
+  const zodRes = serializedClientKeysSchema.safeParse(JSON.parse(serialized));
+  if (zodRes.success) {
+    return {
+      encryptKeyBase64: zodRes.data.encryptKey,
+      decryptKeyBase64: zodRes.data.decryptKey,
+      signKeyBase64: zodRes.data.signKey,
+      verifyKeyBase64: zodRes.data.verifyKey,
+    } satisfies DeserializedClientKeys;
+  }
+  return undefined;
+};
+
+export const storeClientKeys = async (clientKeys: ClientKeys) => {
+  await Promise.all([
+    storeClientKey(clientKeys.encryptKey, "encrypt"),
+    storeClientKey(clientKeys.decryptKey, "decrypt"),
+    storeClientKey(clientKeys.signKey, "sign"),
+    storeClientKey(clientKeys.verifyKey, "verify"),
+  ]);
+};

src/lib/modules/opfs.ts

@@ -0,0 +1,97 @@
+let rootHandle: FileSystemDirectoryHandle | null = null;
+
+export const prepareOpfs = async () => {
+  rootHandle = await navigator.storage.getDirectory();
+};
+
+const getFileHandle = async (path: string, create = true) => {
+  if (!rootHandle) {
+    throw new Error("OPFS not prepared");
+  } else if (path[0] !== "/") {
+    throw new Error("Path must be absolute");
+  }
+
+  const parts = path.split("/");
+  if (parts.length <= 1) {
+    throw new Error("Invalid path");
+  }
+
+  try {
+    let directoryHandle = rootHandle;
+    for (const part of parts.slice(0, -1)) {
+      if (!part) continue;
+      directoryHandle = await directoryHandle.getDirectoryHandle(part, { create });
+    }
+
+    const filename = parts[parts.length - 1]!;
+    const fileHandle = await directoryHandle.getFileHandle(filename, { create });
+    return { parentHandle: directoryHandle, filename, fileHandle };
+  } catch (e) {
+    if (e instanceof DOMException && e.name === "NotFoundError") {
+      return {};
+    }
+    throw e;
+  }
+};
+
+export const readFile = async (path: string) => {
+  const { fileHandle } = await getFileHandle(path, false);
+  if (!fileHandle) return null;
+
+  const file = await fileHandle.getFile();
+  return await file.arrayBuffer();
+};
+
+export const writeFile = async (path: string, data: ArrayBuffer) => {
+  const { fileHandle } = await getFileHandle(path);
+  const writable = await fileHandle!.createWritable();
+
+  try {
+    await writable.write(data);
+  } finally {
+    await writable.close();
+  }
+};
+
+export const deleteFile = async (path: string) => {
+  const { parentHandle, filename } = await getFileHandle(path, false);
+  if (!parentHandle) return;
+
+  await parentHandle.removeEntry(filename);
+};
+
+const getDirectoryHandle = async (path: string) => {
+  if (!rootHandle) {
+    throw new Error("OPFS not prepared");
+  } else if (path[0] !== "/") {
+    throw new Error("Path must be absolute");
+  }
+
+  const parts = path.split("/");
+  if (parts.length <= 1) {
+    throw new Error("Invalid path");
+  }
+
+  try {
+    let directoryHandle = rootHandle;
+    let parentHandle;
+    for (const part of parts.slice(1)) {
+      if (!part) continue;
+      parentHandle = directoryHandle;
+      directoryHandle = await directoryHandle.getDirectoryHandle(part);
+    }
+    return { directoryHandle, parentHandle };
+  } catch (e) {
+    if (e instanceof DOMException && e.name === "NotFoundError") {
+      return {};
+    }
+    throw e;
+  }
+};
+
+export const deleteDirectory = async (path: string) => {
+  const { directoryHandle, parentHandle } = await getDirectoryHandle(path);
+  if (!parentHandle) return;
+
+  await parentHandle.removeEntry(directoryHandle.name, { recursive: true });
+};

src/lib/modules/scheduler.ts

@@ -0,0 +1,48 @@
+export class Scheduler<T = void> {
+  private isEstimating = false;
+  private memoryUsage = 0;
+  private queue: (() => void)[] = [];
+
+  constructor(public readonly memoryLimit = 100 * 1024 * 1024 /* 100 MiB */) {}
+
+  private next() {
+    if (!this.isEstimating && this.memoryUsage < this.memoryLimit) {
+      const resolve = this.queue.shift();
+      if (resolve) {
+        this.isEstimating = true;
+        resolve();
+      }
+    }
+  }
+
+  async schedule(
+    estimateMemoryUsage: number | (() => number | Promise<number>),
+    task: () => Promise<T>,
+  ) {
+    if (this.isEstimating || this.memoryUsage >= this.memoryLimit) {
+      await new Promise<void>((resolve) => {
+        this.queue.push(resolve);
+      });
+    } else {
+      this.isEstimating = true;
+    }
+
+    let taskMemoryUsage = 0;
+
+    try {
+      taskMemoryUsage =
+        typeof estimateMemoryUsage === "number" ? estimateMemoryUsage : await estimateMemoryUsage();
+      this.memoryUsage += taskMemoryUsage;
+    } finally {
+      this.isEstimating = false;
+      this.next();
+    }
+
+    try {
+      return await task();
+    } finally {
+      this.memoryUsage -= taskMemoryUsage;
+      this.next();
+    }
+  }
+}

src/lib/modules/thumbnail.ts

@@ -0,0 +1,127 @@
+import { encodeToBase64 } from "$lib/modules/crypto";
+
+const scaleSize = (width: number, height: number, targetSize: number) => {
+  if (width <= targetSize || height <= targetSize) {
+    return { width, height };
+  }
+
+  const scale = targetSize / Math.min(width, height);
+  return {
+    width: Math.round(width * scale),
+    height: Math.round(height * scale),
+  };
+};
+
+const capture = (
+  width: number,
+  height: number,
+  drawer: (context: CanvasRenderingContext2D, width: number, height: number) => void,
+  targetSize = 250,
+) => {
+  return new Promise<Blob>((resolve, reject) => {
+    const canvas = document.createElement("canvas");
+    const { width: scaledWidth, height: scaledHeight } = scaleSize(width, height, targetSize);
+
+    canvas.width = scaledWidth;
+    canvas.height = scaledHeight;
+
+    const context = canvas.getContext("2d");
+    if (!context) {
+      return reject(new Error("Failed to generate thumbnail"));
+    }
+
+    drawer(context, scaledWidth, scaledHeight);
+    canvas.toBlob((blob) => {
+      if (blob && blob.type === "image/webp") {
+        resolve(blob);
+      } else {
+        reject(new Error("Failed to generate thumbnail"));
+      }
+    }, "image/webp");
+  });
+};
+
+const generateImageThumbnail = (imageUrl: string) => {
+  return new Promise<Blob>((resolve, reject) => {
+    const image = new Image();
+    image.onload = () => {
+      capture(image.width, image.height, (context, width, height) => {
+        context.drawImage(image, 0, 0, width, height);
+      })
+        .then(resolve)
+        .catch(reject);
+    };
+    image.onerror = reject;
+
+    image.src = imageUrl;
+  });
+};
+
+export const captureVideoThumbnail = (video: HTMLVideoElement) => {
+  return capture(video.videoWidth, video.videoHeight, (context, width, height) => {
+    context.drawImage(video, 0, 0, width, height);
+  });
+};
+
+const generateVideoThumbnail = (videoUrl: string, time = 0) => {
+  return new Promise<Blob>((resolve, reject) => {
+    const video = document.createElement("video");
+    video.onloadedmetadata = () => {
+      if (video.videoWidth === 0 || video.videoHeight === 0) {
+        return reject();
+      }
+
+      const callbackId = video.requestVideoFrameCallback(() => {
+        captureVideoThumbnail(video).then(resolve).catch(reject);
+        video.cancelVideoFrameCallback(callbackId);
+      });
+      video.currentTime = Math.min(time, video.duration);
+    };
+    video.onerror = reject;
+
+    video.muted = true;
+    video.playsInline = true;
+    video.src = videoUrl;
+  });
+};
+
+export const generateThumbnail = async (fileBuffer: ArrayBuffer, fileType: string) => {
+  let url;
+  try {
+    if (fileType.startsWith("image/")) {
+      const fileBlob = new Blob([fileBuffer], { type: fileType });
+      url = URL.createObjectURL(fileBlob);
+
+      try {
+        return await generateImageThumbnail(url);
+      } catch {
+        URL.revokeObjectURL(url);
+        url = undefined;
+
+        if (fileType === "image/heic") {
+          const { default: heic2any } = await import("heic2any");
+          url = URL.createObjectURL(
+            (await heic2any({ blob: fileBlob, toType: "image/png" })) as Blob,
+          );
+          return await generateImageThumbnail(url);
+        } else {
+          return null;
+        }
+      }
+    } else if (fileType.startsWith("video/")) {
+      url = URL.createObjectURL(new Blob([fileBuffer], { type: fileType }));
+      return await generateVideoThumbnail(url);
+    }
+    return null;
+  } catch {
+    return null;
+  } finally {
+    if (url) {
+      URL.revokeObjectURL(url);
+    }
+  }
+};
+
+export const getThumbnailUrl = (thumbnailBuffer: ArrayBuffer) => {
+  return `data:image/webp;base64,${encodeToBase64(thumbnailBuffer)}`;
+};

src/lib/server/db/category.ts

@@ -0,0 +1,145 @@
+import { IntegrityError } from "./error";
+import db from "./kysely";
+import type { Ciphertext } from "./schema";
+
+interface Category {
+  id: number;
+  parentId: CategoryId;
+  userId: number;
+  mekVersion: number;
+  encDek: string;
+  dekVersion: Date;
+  encName: Ciphertext;
+}
+
+export type NewCategory = Omit<Category, "id">;
+
+export const registerCategory = async (params: NewCategory) => {
+  await db.transaction().execute(async (trx) => {
+    const mek = await trx
+      .selectFrom("master_encryption_key")
+      .select("version")
+      .where("user_id", "=", params.userId)
+      .where("state", "=", "active")
+      .limit(1)
+      .forUpdate()
+      .executeTakeFirst();
+    if (mek?.version !== params.mekVersion) {
+      throw new IntegrityError("Inactive MEK version");
+    }
+
+    const { categoryId } = await trx
+      .insertInto("category")
+      .values({
+        parent_id: params.parentId !== "root" ? params.parentId : null,
+        user_id: params.userId,
+        master_encryption_key_version: params.mekVersion,
+        encrypted_data_encryption_key: params.encDek,
+        data_encryption_key_version: params.dekVersion,
+        encrypted_name: params.encName,
+      })
+      .returning("id as categoryId")
+      .executeTakeFirstOrThrow();
+    await trx
+      .insertInto("category_log")
+      .values({
+        category_id: categoryId,
+        timestamp: new Date(),
+        action: "create",
+        new_name: params.encName,
+      })
+      .execute();
+  });
+};
+
+export const getAllCategoriesByParent = async (userId: number, parentId: CategoryId) => {
+  let query = db.selectFrom("category").selectAll().where("user_id", "=", userId);
+  query =
+    parentId === "root"
+      ? query.where("parent_id", "is", null)
+      : query.where("parent_id", "=", parentId);
+  const categories = await query.execute();
+  return categories.map(
+    (category) =>
+      ({
+        id: category.id,
+        parentId: category.parent_id ?? "root",
+        userId: category.user_id,
+        mekVersion: category.master_encryption_key_version,
+        encDek: category.encrypted_data_encryption_key,
+        dekVersion: category.data_encryption_key_version,
+        encName: category.encrypted_name,
+      }) satisfies Category,
+  );
+};
+
+export const getCategory = async (userId: number, categoryId: number) => {
+  const category = await db
+    .selectFrom("category")
+    .selectAll()
+    .where("id", "=", categoryId)
+    .where("user_id", "=", userId)
+    .limit(1)
+    .executeTakeFirst();
+  return category
+    ? ({
+        id: category.id,
+        parentId: category.parent_id ?? "root",
+        userId: category.user_id,
+        mekVersion: category.master_encryption_key_version,
+        encDek: category.encrypted_data_encryption_key,
+        dekVersion: category.data_encryption_key_version,
+        encName: category.encrypted_name,
+      } satisfies Category)
+    : null;
+};
+
+export const setCategoryEncName = async (
+  userId: number,
+  categoryId: number,
+  dekVersion: Date,
+  encName: Ciphertext,
+) => {
+  await db.transaction().execute(async (trx) => {
+    const category = await trx
+      .selectFrom("category")
+      .select("data_encryption_key_version")
+      .where("id", "=", categoryId)
+      .where("user_id", "=", userId)
+      .limit(1)
+      .forUpdate()
+      .executeTakeFirst();
+    if (!category) {
+      throw new IntegrityError("Category not found");
+    } else if (category.data_encryption_key_version.getTime() !== dekVersion.getTime()) {
+      throw new IntegrityError("Invalid DEK version");
+    }
+
+    await trx
+      .updateTable("category")
+      .set({ encrypted_name: encName })
+      .where("id", "=", categoryId)
+      .where("user_id", "=", userId)
+      .execute();
+    await trx
+      .insertInto("category_log")
+      .values({
+        category_id: categoryId,
+        timestamp: new Date(),
+        action: "rename",
+        new_name: encName,
+      })
+      .execute();
+  });
+};
+
+export const unregisterCategory = async (userId: number, categoryId: number) => {
+  const res = await db
+    .deleteFrom("category")
+    .where("id", "=", categoryId)
+    .where("user_id", "=", userId)
+    .executeTakeFirst();
+  if (res.numDeletedRows === 0n) {
+    throw new IntegrityError("Category not found");
+  }
+};

src/lib/server/db/client.ts

@@ -1,106 +1,158 @@
-import { SqliteError } from "better-sqlite3";
-import { and, or, eq, gt, lte } from "drizzle-orm";
-import db from "./drizzle";
+import pg from "pg";
 import { IntegrityError } from "./error";
-import { client, userClient, userClientChallenge } from "./schema";
+import db from "./kysely";
+import type { UserClientState } from "./schema";
+
+interface Client {
+  id: number;
+  encPubKey: string;
+  sigPubKey: string;
+}
+
+interface UserClient {
+  userId: number;
+  clientId: number;
+  state: UserClientState;
+}
+
+interface UserClientWithDetails extends UserClient {
+  encPubKey: string;
+  sigPubKey: string;
+}
 
 export const createClient = async (encPubKey: string, sigPubKey: string, userId: number) => {
-  return await db.transaction(
-    async (tx) => {
-      const clients = await tx
-        .select({ id: client.id })
-        .from(client)
-        .where(or(eq(client.encPubKey, sigPubKey), eq(client.sigPubKey, encPubKey)))
-        .limit(1);
-      if (clients.length !== 0) {
+  return await db
+    .transaction()
+    .setIsolationLevel("serializable")
+    .execute(async (trx) => {
+      const client = await trx
+        .selectFrom("client")
+        .where((eb) =>
+          eb.or([
+            eb("encryption_public_key", "=", encPubKey),
+            eb("encryption_public_key", "=", sigPubKey),
+            eb("signature_public_key", "=", encPubKey),
+            eb("signature_public_key", "=", sigPubKey),
+          ]),
+        )
+        .limit(1)
+        .executeTakeFirst();
+      if (client) {
         throw new IntegrityError("Public key(s) already registered");
       }
 
-      const newClients = await tx
-        .insert(client)
-        .values({ encPubKey, sigPubKey })
-        .returning({ id: client.id });
-      const { id: clientId } = newClients[0]!;
-      await tx.insert(userClient).values({ userId, clientId });
-
-      return clientId;
-    },
-    { behavior: "exclusive" },
-  );
+      const { clientId } = await trx
+        .insertInto("client")
+        .values({ encryption_public_key: encPubKey, signature_public_key: sigPubKey })
+        .returning("id as clientId")
+        .executeTakeFirstOrThrow();
+      await trx
+        .insertInto("user_client")
+        .values({ user_id: userId, client_id: clientId })
+        .execute();
+      return { id: clientId };
+    });
 };
 
 export const getClient = async (clientId: number) => {
-  const clients = await db.select().from(client).where(eq(client.id, clientId)).limit(1);
-  return clients[0] ?? null;
+  const client = await db
+    .selectFrom("client")
+    .selectAll()
+    .where("id", "=", clientId)
+    .limit(1)
+    .executeTakeFirst();
+  return client
+    ? ({
+        id: client.id,
+        encPubKey: client.encryption_public_key,
+        sigPubKey: client.signature_public_key,
+      } satisfies Client)
+    : null;
 };
 
 export const getClientByPubKeys = async (encPubKey: string, sigPubKey: string) => {
-  const clients = await db
-    .select()
-    .from(client)
-    .where(and(eq(client.encPubKey, encPubKey), eq(client.sigPubKey, sigPubKey)))
-    .limit(1);
-  return clients[0] ?? null;
+  const client = await db
+    .selectFrom("client")
+    .selectAll()
+    .where("encryption_public_key", "=", encPubKey)
+    .where("signature_public_key", "=", sigPubKey)
+    .limit(1)
+    .executeTakeFirst();
+  return client
+    ? ({
+        id: client.id,
+        encPubKey: client.encryption_public_key,
+        sigPubKey: client.signature_public_key,
+      } satisfies Client)
+    : null;
 };
 
 export const createUserClient = async (userId: number, clientId: number) => {
   try {
-    await db.insert(userClient).values({ userId, clientId });
+    await db.insertInto("user_client").values({ user_id: userId, client_id: clientId }).execute();
   } catch (e) {
-    if (e instanceof SqliteError && e.code === "SQLITE_CONSTRAINT_PRIMARYKEY") {
+    if (e instanceof pg.DatabaseError && e.code === "23505") {
       throw new IntegrityError("User client already exists");
     }
     throw e;
   }
 };
 
-export const getAllUserClients = async (userId: number) => {
-  return await db.select().from(userClient).where(eq(userClient.userId, userId));
-};
-
 export const getUserClient = async (userId: number, clientId: number) => {
-  const userClients = await db
-    .select()
-    .from(userClient)
-    .where(and(eq(userClient.userId, userId), eq(userClient.clientId, clientId)))
-    .limit(1);
-  return userClients[0] ?? null;
+  const userClient = await db
+    .selectFrom("user_client")
+    .selectAll()
+    .where("user_id", "=", userId)
+    .where("client_id", "=", clientId)
+    .limit(1)
+    .executeTakeFirst();
+  return userClient
+    ? ({
+        userId: userClient.user_id,
+        clientId: userClient.client_id,
+        state: userClient.state,
+      } satisfies UserClient)
+    : null;
 };
 
 export const getUserClientWithDetails = async (userId: number, clientId: number) => {
-  const userClients = await db
-    .select()
-    .from(userClient)
-    .innerJoin(client, eq(userClient.clientId, client.id))
-    .where(and(eq(userClient.userId, userId), eq(userClient.clientId, clientId)))
-    .limit(1);
-  return userClients[0] ?? null;
+  const userClient = await db
+    .selectFrom("user_client")
+    .innerJoin("client", "user_client.client_id", "client.id")
+    .selectAll()
+    .where("user_id", "=", userId)
+    .where("client_id", "=", clientId)
+    .limit(1)
+    .executeTakeFirst();
+  return userClient
+    ? ({
+        userId: userClient.user_id,
+        clientId: userClient.client_id,
+        state: userClient.state,
+        encPubKey: userClient.encryption_public_key,
+        sigPubKey: userClient.signature_public_key,
+      } satisfies UserClientWithDetails)
+    : null;
 };
 
 export const setUserClientStateToPending = async (userId: number, clientId: number) => {
   await db
-    .update(userClient)
+    .updateTable("user_client")
     .set({ state: "pending" })
-    .where(
-      and(
-        eq(userClient.userId, userId),
-        eq(userClient.clientId, clientId),
-        eq(userClient.state, "challenging"),
-      ),
-    );
+    .where("user_id", "=", userId)
+    .where("client_id", "=", clientId)
+    .where("state", "=", "challenging")
+    .execute();
 };
 
 export const setUserClientStateToActive = async (userId: number, clientId: number) => {
   await db
-    .update(userClient)
+    .updateTable("user_client")
     .set({ state: "active" })
-    .where(
-      and(
-        eq(userClient.userId, userId),
-        eq(userClient.clientId, clientId),
-        eq(userClient.state, "pending"),
-      ),
-    );
+    .where("user_id", "=", userId)
+    .where("client_id", "=", clientId)
+    .where("state", "=", "pending")
+    .execute();
 };
 
 export const registerUserClientChallenge = async (
@@ -110,30 +162,36 @@ export const registerUserClientChallenge = async (
   allowedIp: string,
   expiresAt: Date,
 ) => {
-  await db.insert(userClientChallenge).values({
-    userId,
-    clientId,
+  const { id } = await db
+    .insertInto("user_client_challenge")
+    .values({
+      user_id: userId,
+      client_id: clientId,
       answer,
-    allowedIp,
-    expiresAt,
-  });
+      allowed_ip: allowedIp,
+      expires_at: expiresAt,
+    })
+    .returning("id")
+    .executeTakeFirstOrThrow();
+  return { id };
 };
 
-export const consumeUserClientChallenge = async (userId: number, answer: string, ip: string) => {
-  const challenges = await db
-    .delete(userClientChallenge)
-    .where(
-      and(
-        eq(userClientChallenge.userId, userId),
-        eq(userClientChallenge.answer, answer),
-        eq(userClientChallenge.allowedIp, ip),
-        gt(userClientChallenge.expiresAt, new Date()),
-      ),
-    )
-    .returning({ clientId: userClientChallenge.clientId });
-  return challenges[0] ?? null;
+export const consumeUserClientChallenge = async (
+  challengeId: number,
+  userId: number,
+  ip: string,
+) => {
+  const challenge = await db
+    .deleteFrom("user_client_challenge")
+    .where("id", "=", challengeId)
+    .where("user_id", "=", userId)
+    .where("allowed_ip", "=", ip)
+    .where("expires_at", ">", new Date())
+    .returning(["client_id", "answer"])
+    .executeTakeFirst();
+  return challenge ? { clientId: challenge.client_id, answer: challenge.answer } : null;
 };
 
 export const cleanupExpiredUserClientChallenges = async () => {
-  await db.delete(userClientChallenge).where(lte(userClientChallenge.expiresAt, new Date()));
+  await db.deleteFrom("user_client_challenge").where("expires_at", "<=", new Date()).execute();
 };

src/lib/server/db/drizzle.ts

@@ -1,15 +0,0 @@
-import Database from "better-sqlite3";
-import { drizzle } from "drizzle-orm/better-sqlite3";
-import { migrate } from "drizzle-orm/better-sqlite3/migrator";
-import env from "$lib/server/loadenv";
-
-const client = new Database(env.databaseUrl);
-const db = drizzle(client);
-
-export const migrateDB = () => {
-  if (process.env.NODE_ENV === "production") {
-    migrate(db, { migrationsFolder: "./drizzle" });
-  }
-};
-
-export default db;

src/lib/server/db/error.ts

@@ -1,4 +1,6 @@
 type IntegrityErrorMessages =
+  // Category
+  | "Category not found"
   // Challenge
   | "Challenge already registered"
   // Client
@@ -7,6 +9,8 @@ type IntegrityErrorMessages =
   // File
   | "Directory not found"
   | "File not found"
+  | "File not found in category"
+  | "File already added to category"
   | "Invalid DEK version"
   // HSK
   | "HSK already registered"

src/lib/server/db/file.ts

@@ -1,21 +1,24 @@
-import { and, eq, isNull } from "drizzle-orm";
-import db from "./drizzle";
+import { sql } from "kysely";
+import { jsonArrayFrom } from "kysely/helpers/postgres";
+import pg from "pg";
 import { IntegrityError } from "./error";
-import { directory, directoryLog, file, fileLog, hsk, mek } from "./schema";
+import db from "./kysely";
+import type { Ciphertext } from "./schema";
 
-type DirectoryId = "root" | number;
-
-export interface NewDirectoryParams {
+interface Directory {
+  id: number;
   parentId: DirectoryId;
   userId: number;
   mekVersion: number;
   encDek: string;
   dekVersion: Date;
-  encName: string;
-  encNameIv: string;
+  encName: Ciphertext;
 }
 
-export interface NewFileParams {
+export type NewDirectory = Omit<Directory, "id">;
+
+interface File {
+  id: number;
   parentId: DirectoryId;
   userId: number;
   path: string;
@@ -26,268 +29,555 @@ export interface NewFileParams {
   contentHmac: string | null;
   contentType: string;
   encContentIv: string;
-  encName: string;
-  encNameIv: string;
+  encContentHash: string;
+  encName: Ciphertext;
+  encCreatedAt: Ciphertext | null;
+  encLastModifiedAt: Ciphertext;
 }
 
-export const registerDirectory = async (params: NewDirectoryParams) => {
-  await db.transaction(
-    async (tx) => {
-      const meks = await tx
-        .select({ version: mek.version })
-        .from(mek)
-        .where(and(eq(mek.userId, params.userId), eq(mek.state, "active")))
-        .limit(1);
-      if (meks[0]?.version !== params.mekVersion) {
+export type NewFile = Omit<File, "id">;
+
+interface FileCategory {
+  id: number;
+  parentId: CategoryId;
+  mekVersion: number;
+  encDek: string;
+  dekVersion: Date;
+  encName: Ciphertext;
+}
+
+export const registerDirectory = async (params: NewDirectory) => {
+  await db.transaction().execute(async (trx) => {
+    const mek = await trx
+      .selectFrom("master_encryption_key")
+      .select("version")
+      .where("user_id", "=", params.userId)
+      .where("state", "=", "active")
+      .limit(1)
+      .forUpdate()
+      .executeTakeFirst();
+    if (mek?.version !== params.mekVersion) {
       throw new IntegrityError("Inactive MEK version");
     }
 
-      const newDirectories = await tx
-        .insert(directory)
+    const { directoryId } = await trx
+      .insertInto("directory")
       .values({
-          parentId: params.parentId === "root" ? null : params.parentId,
-          userId: params.userId,
-          mekVersion: params.mekVersion,
-          encDek: params.encDek,
-          dekVersion: params.dekVersion,
-          encName: { ciphertext: params.encName, iv: params.encNameIv },
+        parent_id: params.parentId !== "root" ? params.parentId : null,
+        user_id: params.userId,
+        master_encryption_key_version: params.mekVersion,
+        encrypted_data_encryption_key: params.encDek,
+        data_encryption_key_version: params.dekVersion,
+        encrypted_name: params.encName,
       })
-        .returning({ id: directory.id });
-      const { id: directoryId } = newDirectories[0]!;
-      await tx.insert(directoryLog).values({
-        directoryId,
+      .returning("id as directoryId")
+      .executeTakeFirstOrThrow();
+    await trx
+      .insertInto("directory_log")
+      .values({
+        directory_id: directoryId,
         timestamp: new Date(),
         action: "create",
-        newName: { ciphertext: params.encName, iv: params.encNameIv },
+        new_name: params.encName,
+      })
+      .execute();
   });
-    },
-    { behavior: "exclusive" },
-  );
 };
 
 export const getAllDirectoriesByParent = async (userId: number, parentId: DirectoryId) => {
-  return await db
-    .select()
-    .from(directory)
-    .where(
-      and(
-        eq(directory.userId, userId),
-        parentId === "root" ? isNull(directory.parentId) : eq(directory.parentId, parentId),
-      ),
+  let query = db.selectFrom("directory").selectAll().where("user_id", "=", userId);
+  query =
+    parentId === "root"
+      ? query.where("parent_id", "is", null)
+      : query.where("parent_id", "=", parentId);
+  const directories = await query.execute();
+  return directories.map(
+    (directory) =>
+      ({
+        id: directory.id,
+        parentId: directory.parent_id ?? "root",
+        userId: directory.user_id,
+        mekVersion: directory.master_encryption_key_version,
+        encDek: directory.encrypted_data_encryption_key,
+        dekVersion: directory.data_encryption_key_version,
+        encName: directory.encrypted_name,
+      }) satisfies Directory,
   );
 };
 
 export const getDirectory = async (userId: number, directoryId: number) => {
-  const res = await db
-    .select()
-    .from(directory)
-    .where(and(eq(directory.userId, userId), eq(directory.id, directoryId)))
-    .limit(1);
-  return res[0] ?? null;
+  const directory = await db
+    .selectFrom("directory")
+    .selectAll()
+    .where("id", "=", directoryId)
+    .where("user_id", "=", userId)
+    .limit(1)
+    .executeTakeFirst();
+  return directory
+    ? ({
+        id: directory.id,
+        parentId: directory.parent_id ?? "root",
+        userId: directory.user_id,
+        mekVersion: directory.master_encryption_key_version,
+        encDek: directory.encrypted_data_encryption_key,
+        dekVersion: directory.data_encryption_key_version,
+        encName: directory.encrypted_name,
+      } satisfies Directory)
+    : null;
 };
 
 export const setDirectoryEncName = async (
   userId: number,
   directoryId: number,
   dekVersion: Date,
-  encName: string,
-  encNameIv: string,
+  encName: Ciphertext,
 ) => {
-  await db.transaction(
-    async (tx) => {
-      const directories = await tx
-        .select({ version: directory.dekVersion })
-        .from(directory)
-        .where(and(eq(directory.userId, userId), eq(directory.id, directoryId)))
-        .limit(1);
-      if (!directories[0]) {
+  await db.transaction().execute(async (trx) => {
+    const directory = await trx
+      .selectFrom("directory")
+      .select("data_encryption_key_version")
+      .where("id", "=", directoryId)
+      .where("user_id", "=", userId)
+      .limit(1)
+      .forUpdate()
+      .executeTakeFirst();
+    if (!directory) {
       throw new IntegrityError("Directory not found");
-      } else if (directories[0].version.getTime() !== dekVersion.getTime()) {
+    } else if (directory.data_encryption_key_version.getTime() !== dekVersion.getTime()) {
       throw new IntegrityError("Invalid DEK version");
     }
 
-      await tx
-        .update(directory)
-        .set({ encName: { ciphertext: encName, iv: encNameIv } })
-        .where(and(eq(directory.userId, userId), eq(directory.id, directoryId)));
-      await tx.insert(directoryLog).values({
-        directoryId,
+    await trx
+      .updateTable("directory")
+      .set({ encrypted_name: encName })
+      .where("id", "=", directoryId)
+      .where("user_id", "=", userId)
+      .execute();
+    await trx
+      .insertInto("directory_log")
+      .values({
+        directory_id: directoryId,
         timestamp: new Date(),
         action: "rename",
-        newName: { ciphertext: encName, iv: encNameIv },
+        new_name: encName,
+      })
+      .execute();
   });
-    },
-    { behavior: "exclusive" },
-  );
 };
 
 export const unregisterDirectory = async (userId: number, directoryId: number) => {
-  return await db.transaction(
-    async (tx) => {
+  return await db
+    .transaction()
+    .setIsolationLevel("repeatable read") // TODO: Sufficient?
+    .execute(async (trx) => {
       const unregisterFiles = async (parentId: number) => {
-        const files = await tx
-          .delete(file)
-          .where(and(eq(file.userId, userId), eq(file.parentId, parentId)))
-          .returning({ path: file.path });
-        return files.map(({ path }) => path);
+        const files = await trx
+          .selectFrom("file")
+          .leftJoin("thumbnail", "file.id", "thumbnail.file_id")
+          .select(["file.id", "file.path", "thumbnail.path as thumbnailPath"])
+          .where("file.parent_id", "=", parentId)
+          .where("file.user_id", "=", userId)
+          .forUpdate("file")
+          .execute();
+        await trx
+          .deleteFrom("file")
+          .where("parent_id", "=", parentId)
+          .where("user_id", "=", userId)
+          .execute();
+        return files;
       };
-      const unregisterDirectoryRecursively = async (directoryId: number): Promise<string[]> => {
-        const filePaths = await unregisterFiles(directoryId);
-        const subDirectories = await tx
-          .select({ id: directory.id })
-          .from(directory)
-          .where(and(eq(directory.userId, userId), eq(directory.parentId, directoryId)));
+      const unregisterDirectoryRecursively = async (
+        directoryId: number,
+      ): Promise<{ id: number; path: string; thumbnailPath: string | null }[]> => {
+        const files = await unregisterFiles(directoryId);
+        const subDirectories = await trx
+          .selectFrom("directory")
+          .select("id")
+          .where("parent_id", "=", directoryId)
+          .where("user_id", "=", userId)
+          .execute();
         const subDirectoryFilePaths = await Promise.all(
           subDirectories.map(async ({ id }) => await unregisterDirectoryRecursively(id)),
         );
 
-        const deleteRes = await tx.delete(directory).where(eq(directory.id, directoryId));
-        if (deleteRes.changes === 0) {
+        const deleteRes = await trx
+          .deleteFrom("directory")
+          .where("id", "=", directoryId)
+          .where("user_id", "=", userId)
+          .executeTakeFirst();
+        if (deleteRes.numDeletedRows === 0n) {
           throw new IntegrityError("Directory not found");
         }
-        return filePaths.concat(...subDirectoryFilePaths);
+        return files.concat(...subDirectoryFilePaths);
       };
       return await unregisterDirectoryRecursively(directoryId);
-    },
-    { behavior: "exclusive" },
-  );
+    });
 };
 
-export const registerFile = async (params: NewFileParams) => {
+export const registerFile = async (params: NewFile) => {
   if ((params.hskVersion && !params.contentHmac) || (!params.hskVersion && params.contentHmac)) {
     throw new Error("Invalid arguments");
   }
 
-  await db.transaction(
-    async (tx) => {
-      const meks = await tx
-        .select({ version: mek.version })
-        .from(mek)
-        .where(and(eq(mek.userId, params.userId), eq(mek.state, "active")))
-        .limit(1);
-      if (meks[0]?.version !== params.mekVersion) {
+  return await db.transaction().execute(async (trx) => {
+    const mek = await trx
+      .selectFrom("master_encryption_key")
+      .select("version")
+      .where("user_id", "=", params.userId)
+      .where("state", "=", "active")
+      .limit(1)
+      .forUpdate()
+      .executeTakeFirst();
+    if (mek?.version !== params.mekVersion) {
       throw new IntegrityError("Inactive MEK version");
     }
 
     if (params.hskVersion) {
-        const hsks = await tx
-          .select({ version: hsk.version })
-          .from(hsk)
-          .where(and(eq(hsk.userId, params.userId), eq(hsk.state, "active")))
-          .limit(1);
-        if (hsks[0]?.version !== params.hskVersion) {
+      const hsk = await trx
+        .selectFrom("hmac_secret_key")
+        .select("version")
+        .where("user_id", "=", params.userId)
+        .where("state", "=", "active")
+        .limit(1)
+        .forUpdate()
+        .executeTakeFirst();
+      if (hsk?.version !== params.hskVersion) {
         throw new IntegrityError("Inactive HSK version");
       }
     }
 
-      const newFiles = await tx
-        .insert(file)
+    const { fileId } = await trx
+      .insertInto("file")
       .values({
+        parent_id: params.parentId !== "root" ? params.parentId : null,
+        user_id: params.userId,
         path: params.path,
-          parentId: params.parentId === "root" ? null : params.parentId,
-          userId: params.userId,
-          mekVersion: params.mekVersion,
-          hskVersion: params.hskVersion,
-          contentHmac: params.contentHmac,
-          contentType: params.contentType,
-          encDek: params.encDek,
-          dekVersion: params.dekVersion,
-          encContentIv: params.encContentIv,
-          encName: { ciphertext: params.encName, iv: params.encNameIv },
+        master_encryption_key_version: params.mekVersion,
+        encrypted_data_encryption_key: params.encDek,
+        data_encryption_key_version: params.dekVersion,
+        hmac_secret_key_version: params.hskVersion,
+        content_hmac: params.contentHmac,
+        content_type: params.contentType,
+        encrypted_content_iv: params.encContentIv,
+        encrypted_content_hash: params.encContentHash,
+        encrypted_name: params.encName,
+        encrypted_created_at: params.encCreatedAt,
+        encrypted_last_modified_at: params.encLastModifiedAt,
       })
-        .returning({ id: file.id });
-      const { id: fileId } = newFiles[0]!;
-      await tx.insert(fileLog).values({
-        fileId,
+      .returning("id as fileId")
+      .executeTakeFirstOrThrow();
+    await trx
+      .insertInto("file_log")
+      .values({
+        file_id: fileId,
         timestamp: new Date(),
         action: "create",
-        newName: { ciphertext: params.encName, iv: params.encNameIv },
+        new_name: params.encName,
+      })
+      .execute();
+    return { id: fileId };
   });
-    },
-    { behavior: "exclusive" },
-  );
 };
 
 export const getAllFilesByParent = async (userId: number, parentId: DirectoryId) => {
-  return await db
-    .select()
-    .from(file)
-    .where(
-      and(
-        eq(file.userId, userId),
-        parentId === "root" ? isNull(file.parentId) : eq(file.parentId, parentId),
-      ),
+  let query = db.selectFrom("file").selectAll().where("user_id", "=", userId);
+  query =
+    parentId === "root"
+      ? query.where("parent_id", "is", null)
+      : query.where("parent_id", "=", parentId);
+  const files = await query.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,
+      }) satisfies File,
   );
 };
 
+export const getAllFilesByCategory = async (
+  userId: number,
+  categoryId: number,
+  recurse: boolean,
+) => {
+  const files = await db
+    .withRecursive("category_tree", (db) =>
+      db
+        .selectFrom("category")
+        .select(["id", sql<number>`0`.as("depth")])
+        .where("id", "=", categoryId)
+        .where("user_id", "=", userId)
+        .$if(recurse, (qb) =>
+          qb.unionAll((db) =>
+            db
+              .selectFrom("category")
+              .innerJoin("category_tree", "category.parent_id", "category_tree.id")
+              .select(["category.id", sql<number>`depth + 1`.as("depth")]),
+          ),
+        ),
+    )
+    .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")
+    .orderBy("file_id")
+    .orderBy("depth")
+    .execute();
+  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) => {
+  const files = await db.selectFrom("file").select("id").where("user_id", "=", userId).execute();
+  return files.map(({ id }) => id);
+};
+
 export const getAllFileIdsByContentHmac = async (
   userId: number,
   hskVersion: number,
   contentHmac: string,
 ) => {
-  return await db
-    .select({ id: file.id })
-    .from(file)
-    .where(
-      and(
-        eq(file.userId, userId),
-        eq(file.hskVersion, hskVersion),
-        eq(file.contentHmac, contentHmac),
-      ),
-    );
+  const files = await db
+    .selectFrom("file")
+    .select("id")
+    .where("user_id", "=", userId)
+    .where("hmac_secret_key_version", "=", hskVersion)
+    .where("content_hmac", "=", contentHmac)
+    .execute();
+  return files.map(({ id }) => id);
 };
 
 export const getFile = async (userId: number, fileId: number) => {
-  const res = await db
-    .select()
-    .from(file)
-    .where(and(eq(file.userId, userId), eq(file.id, fileId)))
-    .limit(1);
-  return res[0] ?? null;
+  const file = await db
+    .selectFrom("file")
+    .selectAll()
+    .where("id", "=", fileId)
+    .where("user_id", "=", userId)
+    .limit(1)
+    .executeTakeFirst();
+  return 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,
+      } satisfies File)
+    : 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,
+          parentId: category.parent_id ?? "root",
+          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,
   dekVersion: Date,
-  encName: string,
-  encNameIv: string,
+  encName: Ciphertext,
 ) => {
-  await db.transaction(
-    async (tx) => {
-      const files = await tx
-        .select({ version: file.dekVersion })
-        .from(file)
-        .where(and(eq(file.userId, userId), eq(file.id, fileId)))
-        .limit(1);
-      if (!files[0]) {
+  await db.transaction().execute(async (trx) => {
+    const file = await trx
+      .selectFrom("file")
+      .select("data_encryption_key_version")
+      .where("id", "=", fileId)
+      .where("user_id", "=", userId)
+      .limit(1)
+      .forUpdate()
+      .executeTakeFirst();
+    if (!file) {
       throw new IntegrityError("File not found");
-      } else if (files[0].version.getTime() !== dekVersion.getTime()) {
+    } else if (file.data_encryption_key_version.getTime() !== dekVersion.getTime()) {
       throw new IntegrityError("Invalid DEK version");
     }
 
-      await tx
-        .update(file)
-        .set({ encName: { ciphertext: encName, iv: encNameIv } })
-        .where(and(eq(file.userId, userId), eq(file.id, fileId)));
-      await tx.insert(fileLog).values({
-        fileId,
+    await trx
+      .updateTable("file")
+      .set({ encrypted_name: encName })
+      .where("id", "=", fileId)
+      .where("user_id", "=", userId)
+      .execute();
+    await trx
+      .insertInto("file_log")
+      .values({
+        file_id: fileId,
         timestamp: new Date(),
         action: "rename",
-        newName: { ciphertext: encName, iv: encNameIv },
+        new_name: encName,
+      })
+      .execute();
   });
-    },
-    { behavior: "exclusive" },
-  );
 };
 
 export const unregisterFile = async (userId: number, fileId: number) => {
-  const files = await db
-    .delete(file)
-    .where(and(eq(file.userId, userId), eq(file.id, fileId)))
-    .returning({ path: file.path });
-  if (!files[0]) {
+  return await db.transaction().execute(async (trx) => {
+    const file = await trx
+      .selectFrom("file")
+      .leftJoin("thumbnail", "file.id", "thumbnail.file_id")
+      .select(["file.path", "thumbnail.path as thumbnailPath"])
+      .where("file.id", "=", fileId)
+      .where("file.user_id", "=", userId)
+      .forUpdate("file")
+      .executeTakeFirst();
+    if (!file) {
       throw new IntegrityError("File not found");
     }
-  return files[0].path;
+
+    await trx.deleteFrom("file").where("id", "=", fileId).execute();
+    return file;
+  });
+};
+
+export const addFileToCategory = async (fileId: number, categoryId: number) => {
+  await db.transaction().execute(async (trx) => {
+    try {
+      await trx
+        .insertInto("file_category")
+        .values({ file_id: fileId, category_id: categoryId })
+        .execute();
+      await trx
+        .insertInto("file_log")
+        .values({
+          file_id: fileId,
+          timestamp: new Date(),
+          action: "add-to-category",
+          category_id: categoryId,
+        })
+        .execute();
+    } catch (e) {
+      if (e instanceof pg.DatabaseError && e.code === "23505") {
+        throw new IntegrityError("File already added to category");
+      }
+      throw e;
+    }
+  });
+};
+
+export const getAllFileCategories = async (fileId: number) => {
+  const categories = await db
+    .selectFrom("file_category")
+    .innerJoin("category", "file_category.category_id", "category.id")
+    .selectAll("category")
+    .where("file_id", "=", fileId)
+    .execute();
+  return categories.map(
+    (category) =>
+      ({
+        id: category.id,
+        parentId: category.parent_id ?? "root",
+        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) => {
+  await db.transaction().execute(async (trx) => {
+    const res = await trx
+      .deleteFrom("file_category")
+      .where("file_id", "=", fileId)
+      .where("category_id", "=", categoryId)
+      .executeTakeFirst();
+    if (res.numDeletedRows === 0n) {
+      throw new IntegrityError("File not found in category");
+    }
+
+    await trx
+      .insertInto("file_log")
+      .values({
+        file_id: fileId,
+        timestamp: new Date(),
+        action: "remove-from-category",
+        category_id: categoryId,
+      })
+      .execute();
+  });
 };

src/lib/server/db/hsk.ts

@@ -1,8 +1,15 @@
-import { SqliteError } from "better-sqlite3";
-import { and, eq } from "drizzle-orm";
-import db from "./drizzle";
+import pg from "pg";
 import { IntegrityError } from "./error";
-import { hsk, hskLog } from "./schema";
+import db from "./kysely";
+import type { HskState } from "./schema";
+
+interface Hsk {
+  userId: number;
+  version: number;
+  state: HskState;
+  mekVersion: number;
+  encHsk: string;
+}
 
 export const registerInitialHsk = async (
   userId: number,
@@ -10,37 +17,52 @@ export const registerInitialHsk = async (
   mekVersion: number,
   encHsk: string,
 ) => {
-  await db.transaction(
-    async (tx) => {
+  await db.transaction().execute(async (trx) => {
     try {
-        await tx.insert(hsk).values({
-          userId,
+      await trx
+        .insertInto("hmac_secret_key")
+        .values({
+          user_id: userId,
           version: 1,
           state: "active",
-          mekVersion,
-          encHsk,
-        });
-        await tx.insert(hskLog).values({
-          userId,
-          hskVersion: 1,
+          master_encryption_key_version: mekVersion,
+          encrypted_key: encHsk,
+        })
+        .execute();
+      await trx
+        .insertInto("hmac_secret_key_log")
+        .values({
+          user_id: userId,
+          hmac_secret_key_version: 1,
           timestamp: new Date(),
           action: "create",
-          actionBy: createdBy,
-        });
+          action_by: createdBy,
+        })
+        .execute();
     } catch (e) {
-        if (e instanceof SqliteError && e.code === "SQLITE_CONSTRAINT_PRIMARYKEY") {
+      if (e instanceof pg.DatabaseError && e.code === "23505") {
         throw new IntegrityError("HSK already registered");
       }
       throw e;
     }
-    },
-    { behavior: "exclusive" },
-  );
+  });
 };
 
 export const getAllValidHsks = async (userId: number) => {
-  return await db
-    .select()
-    .from(hsk)
-    .where(and(eq(hsk.userId, userId), eq(hsk.state, "active")));
+  const hsks = await db
+    .selectFrom("hmac_secret_key")
+    .selectAll()
+    .where("user_id", "=", userId)
+    .where("state", "=", "active")
+    .execute();
+  return hsks.map(
+    ({ user_id, version, state, master_encryption_key_version, encrypted_key }) =>
+      ({
+        userId: user_id,
+        version,
+        state: state as "active",
+        mekVersion: master_encryption_key_version,
+        encHsk: encrypted_key,
+      }) satisfies Hsk,
+  );
 };