Merge pull request #19 from kmc7468/dev

v0.8.0

.github/workflows/docker.yaml

@@ -0,0 +1,45 @@
+name: Docker Image Build
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract Docker metadata
+        uses: docker/metadata-action@v5
+        id: meta
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=semver,value={{version}}
+            type=raw,value=latest
+            type=sha
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

docker-compose.yaml

@@ -9,6 +9,7 @@ services:
     volumes:
       - ./data/library:/app/data/library
       - ./data/thumbnails:/app/data/thumbnails
+      - ./data/uploads:/app/data/uploads
     environment:
       # ArkVault
       - DATABASE_HOST=database

src/hooks.server.ts

@@ -7,8 +7,8 @@ import {
   cleanupExpiredSessions,
   cleanupExpiredSessionUpgradeChallenges,
 } from "$lib/server/db/session";
-import { cleanupExpiredUploadSessions } from "$lib/server/services/upload";
 import { authenticate, setAgentInfo } from "$lib/server/middlewares";
+import { cleanupExpiredUploadSessions } from "$lib/server/services/upload";
 
 export const init: ServerInit = async () => {
   await migrateDB();

src/lib/modules/crypto/sha.ts

@@ -1,5 +1,5 @@
-import { hmac } from "@noble/hashes/hmac.js";
-import { sha256 } from "@noble/hashes/sha2.js";
+import HmacWorker from "$workers/hmac?worker";
+import type { ComputeMessage, ResultMessage } from "$workers/hmac";
 
 export const digestMessage = async (message: BufferSource) => {
   return await crypto.subtle.digest("SHA-256", message);
@@ -18,10 +18,24 @@ export const generateHmacSecret = async () => {
   };
 };
 
-export const createHmacStream = async (hmacSecret: CryptoKey) => {
-  const h = hmac.create(sha256, new Uint8Array(await crypto.subtle.exportKey("raw", hmacSecret)));
-  return {
-    update: (data: Uint8Array) => h.update(data),
-    digest: () => h.digest(),
-  };
+export const signMessageHmac = async (message: Blob, hmacSecret: CryptoKey) => {
+  const stream = message.stream();
+  const hmacSecretRaw = new Uint8Array(await crypto.subtle.exportKey("raw", hmacSecret));
+  const worker = new HmacWorker();
+
+  return new Promise<Uint8Array>((resolve, reject) => {
+    worker.onmessage = ({ data }: MessageEvent<ResultMessage>) => {
+      resolve(data.result);
+      worker.terminate();
+    };
+
+    worker.onerror = ({ error }) => {
+      reject(error);
+      worker.terminate();
+    };
+
+    worker.postMessage({ stream, key: hmacSecretRaw } satisfies ComputeMessage, {
+      transfer: [stream, hmacSecretRaw.buffer],
+    });
+  });
 };

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

@@ -1,6 +1,6 @@
 import axios from "axios";
 import { limitFunction } from "p-limit";
-import { CHUNK_SIZE, ENCRYPTION_OVERHEAD } from "$lib/constants";
+import { ENCRYPTED_CHUNK_SIZE } from "$lib/constants";
 import { decryptChunk, concatenateBuffers } from "$lib/modules/crypto";
 
 export interface FileDownloadState {
@@ -100,7 +100,7 @@ export const downloadFile = async (id: number, dataKey: CryptoKey, isLegacy: boo
     return await decryptFile(
       state,
       fileEncrypted,
-      isLegacy ? fileEncrypted.byteLength : CHUNK_SIZE + ENCRYPTION_OVERHEAD,
+      isLegacy ? fileEncrypted.byteLength : ENCRYPTED_CHUNK_SIZE,
       dataKey,
     );
   } catch (e) {

src/lib/modules/file/thumbnail.ts

@@ -1,7 +1,7 @@
 import { LRUCache } from "lru-cache";
 import { writable, type Writable } from "svelte/store";
 import { browser } from "$app/environment";
-import { decryptData } from "$lib/modules/crypto";
+import { decryptChunk } 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";
@@ -20,12 +20,7 @@ const fetchFromServer = async (fileId: number, dataKey: CryptoKey) => {
   const res = await fetch(`/api/file/${fileId}/thumbnail/download`);
   if (!res.ok) return null;
 
-  const thumbnailEncrypted = await res.arrayBuffer();
-  const thumbnailBuffer = await decryptData(
-    thumbnailEncrypted.slice(12),
-    thumbnailEncrypted.slice(0, 12),
-    dataKey,
-  );
+  const thumbnailBuffer = await decryptChunk(await res.arrayBuffer(), dataKey);
 
   void writeFile(`/thumbnail/file/${fileId}`, thumbnailBuffer);
   return getThumbnailUrl(thumbnailBuffer);

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

@@ -1,21 +1,13 @@
 import ExifReader from "exifreader";
-import pLimit, { limitFunction } from "p-limit";
+import { limitFunction } from "p-limit";
 import { CHUNK_SIZE } from "$lib/constants";
-import {
-  encodeToBase64,
-  generateDataKey,
-  wrapDataKey,
-  encryptData,
-  encryptString,
-  encryptChunk,
-  digestMessage,
-  createHmacStream,
-} from "$lib/modules/crypto";
-import { Scheduler } from "$lib/modules/scheduler";
-import { generateThumbnail, generateThumbnailFromFile } from "$lib/modules/thumbnail";
+import { encodeToBase64, generateDataKey, wrapDataKey, encryptString } from "$lib/modules/crypto";
+import { signMessageHmac } from "$lib/modules/crypto";
+import { generateThumbnail } from "$lib/modules/thumbnail";
+import { uploadBlob } from "$lib/modules/upload";
 import type { MasterKey, HmacSecret } from "$lib/stores";
+import { Scheduler } from "$lib/utils";
 import { trpc } from "$trpc/client";
-import type { RouterInputs } from "$trpc/router.server";
 
 export interface FileUploadState {
   name: string;
@@ -58,17 +50,15 @@ export const clearUploadedFiles = () => {
 };
 
 const requestDuplicateFileScan = limitFunction(
-  async (file: File, hmacSecret: HmacSecret, onDuplicate: () => Promise<boolean>) => {
-    const hmacStream = await createHmacStream(hmacSecret.secret);
-    const reader = file.stream().getReader();
+  async (
+    state: FileUploadState,
+    file: File,
+    hmacSecret: HmacSecret,
+    onDuplicate: () => Promise<boolean>,
+  ) => {
+    state.status = "encryption-pending";
 
-    while (true) {
-      const { done, value } = await reader.read();
-      if (done) break;
-      hmacStream.update(value);
-    }
-
-    const fileSigned = encodeToBase64(hmacStream.digest());
+    const fileSigned = encodeToBase64(await signMessageHmac(file, hmacSecret.secret));
     const files = await trpc().file.listByHash.query({
       hskVersion: hmacSecret.version,
       contentHmac: fileSigned,
@@ -114,295 +104,107 @@ const extractExifDateTime = (fileBuffer: ArrayBuffer) => {
   return new Date(utcDate - offsetMs);
 };
 
-const encryptChunks = async (fileBuffer: ArrayBuffer, dataKey: CryptoKey) => {
-  const chunksEncrypted: { chunkEncrypted: ArrayBuffer; chunkEncryptedHash: string }[] = [];
-  let offset = 0;
+interface FileMetadata {
+  parentId: "root" | number;
+  name: string;
+  createdAt?: Date;
+  lastModifiedAt: Date;
+}
 
-  while (offset < fileBuffer.byteLength) {
-    const nextOffset = Math.min(offset + CHUNK_SIZE, fileBuffer.byteLength);
-    const chunkEncrypted = await encryptChunk(fileBuffer.slice(offset, nextOffset), dataKey);
-    chunksEncrypted.push({
-      chunkEncrypted: chunkEncrypted,
-      chunkEncryptedHash: encodeToBase64(await digestMessage(chunkEncrypted)),
-    });
-    offset = nextOffset;
-  }
-
-  return chunksEncrypted;
-};
-
-const encryptImageFile = limitFunction(
-  async (state: FileUploadState, file: File, masterKey: MasterKey) => {
+const requestFileMetadataEncryption = limitFunction(
+  async (
+    state: FileUploadState,
+    file: Blob,
+    fileMetadata: FileMetadata,
+    masterKey: MasterKey,
+    hmacSecret: HmacSecret,
+  ) => {
     state.status = "encrypting";
 
-    const fileBuffer = await file.arrayBuffer();
-    const createdAt = extractExifDateTime(fileBuffer);
-
     const { dataKey, dataKeyVersion } = await generateDataKey();
     const dataKeyWrapped = await wrapDataKey(dataKey, masterKey.key);
-    const chunksEncrypted = await encryptChunks(fileBuffer, dataKey);
 
-    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 [nameEncrypted, createdAtEncrypted, lastModifiedAtEncrypted, thumbnailBuffer] =
+      await Promise.all([
+        encryptString(fileMetadata.name, dataKey),
+        fileMetadata.createdAt &&
+          encryptString(fileMetadata.createdAt.getTime().toString(), dataKey),
+        encryptString(fileMetadata.lastModifiedAt.getTime().toString(), dataKey),
+        generateThumbnail(file).then((blob) => blob?.arrayBuffer()),
+      ]);
 
-    const thumbnail = await generateThumbnail(fileBuffer, getFileType(file));
-    const thumbnailBuffer = await thumbnail?.arrayBuffer();
-    const thumbnailEncrypted = thumbnailBuffer && (await encryptData(thumbnailBuffer, dataKey));
+    const { uploadId } = await trpc().upload.startFileUpload.mutate({
+      chunks: Math.ceil(file.size / CHUNK_SIZE),
+      parent: fileMetadata.parentId,
+      mekVersion: masterKey.version,
+      dek: dataKeyWrapped,
+      dekVersion: dataKeyVersion,
+      hskVersion: hmacSecret.version,
+      contentType: file.type,
+      name: nameEncrypted.ciphertext,
+      nameIv: nameEncrypted.iv,
+      createdAt: createdAtEncrypted?.ciphertext,
+      createdAtIv: createdAtEncrypted?.iv,
+      lastModifiedAt: lastModifiedAtEncrypted.ciphertext,
+      lastModifiedAtIv: lastModifiedAtEncrypted.iv,
+    });
 
     state.status = "upload-pending";
-
-    return {
-      dataKeyWrapped,
-      dataKeyVersion,
-      chunksEncrypted,
-      nameEncrypted,
-      createdAtEncrypted,
-      lastModifiedAtEncrypted,
-      thumbnail: thumbnailEncrypted && { plaintext: thumbnailBuffer, ...thumbnailEncrypted },
-    };
+    return { uploadId, thumbnailBuffer, dataKey, dataKeyVersion };
   },
   { concurrency: 4 },
 );
 
-const uploadThumbnail = async (
-  fileId: number,
-  thumbnailEncrypted: { ciphertext: ArrayBuffer; iv: ArrayBuffer },
-  dataKeyVersion: Date,
-) => {
-  const { uploadId } = await trpc().upload.startFileThumbnailUpload.mutate({
-    file: fileId,
-    dekVersion: dataKeyVersion,
-  });
-
-  const ivAndCiphertext = new Uint8Array(
-    thumbnailEncrypted.iv.byteLength + thumbnailEncrypted.ciphertext.byteLength,
-  );
-  ivAndCiphertext.set(new Uint8Array(thumbnailEncrypted.iv), 0);
-  ivAndCiphertext.set(
-    new Uint8Array(thumbnailEncrypted.ciphertext),
-    thumbnailEncrypted.iv.byteLength,
-  );
-
-  const chunkHash = encodeToBase64(await digestMessage(ivAndCiphertext));
-
-  const response = await fetch(`/api/upload/${uploadId}/chunks/0`, {
-    method: "POST",
-    headers: {
-      "Content-Type": "application/octet-stream",
-      "Content-Digest": `sha-256=:${chunkHash}:`,
-    },
-    body: ivAndCiphertext,
-  });
-
-  if (!response.ok) {
-    throw new Error(`Thumbnail upload failed: ${response.status} ${response.statusText}`);
-  }
-
-  await trpc().upload.completeFileThumbnailUpload.mutate({ uploadId });
-};
-
-const requestImageFileUpload = limitFunction(
+const requestFileUpload = limitFunction(
   async (
     state: FileUploadState,
-    metadata: RouterInputs["upload"]["startFileUpload"],
-    chunksEncrypted: { chunkEncrypted: ArrayBuffer; chunkEncryptedHash: string }[],
-    fileSigned: string | undefined,
-    thumbnailData: { ciphertext: ArrayBuffer; iv: ArrayBuffer; plaintext: ArrayBuffer } | null,
+    uploadId: string,
+    file: Blob,
+    fileSigned: string,
+    thumbnailBuffer: ArrayBuffer | undefined,
+    dataKey: CryptoKey,
     dataKeyVersion: Date,
   ) => {
     state.status = "uploading";
 
-    const { uploadId } = await trpc().upload.startFileUpload.mutate(metadata);
-
-    const totalBytes = chunksEncrypted.reduce((sum, c) => sum + c.chunkEncrypted.byteLength, 0);
-    let uploadedBytes = 0;
-    const startTime = Date.now();
-
-    for (let i = 0; i < chunksEncrypted.length; i++) {
-      const { chunkEncrypted, chunkEncryptedHash } = chunksEncrypted[i]!;
-
-      const response = await fetch(`/api/upload/${uploadId}/chunks/${i}`, {
-        method: "POST",
-        headers: {
-          "Content-Type": "application/octet-stream",
-          "Content-Digest": `sha-256=:${chunkEncryptedHash}:`,
-        },
-        body: chunkEncrypted,
-      });
-
-      if (!response.ok) {
-        throw new Error(`Chunk upload failed: ${response.status} ${response.statusText}`);
-      }
-
-      uploadedBytes += chunkEncrypted.byteLength;
-
-      const elapsed = (Date.now() - startTime) / 1000;
-      const rate = uploadedBytes / elapsed;
-      const remaining = totalBytes - uploadedBytes;
-      const estimated = rate > 0 ? remaining / rate : undefined;
-
-      state.progress = uploadedBytes / totalBytes;
-      state.rate = rate;
-      state.estimated = estimated;
-    }
+    await uploadBlob(uploadId, file, dataKey, {
+      onProgress(s) {
+        state.progress = s.progress;
+        state.rate = s.rate;
+      },
+    });
 
     const { file: fileId } = await trpc().upload.completeFileUpload.mutate({
       uploadId,
       contentHmac: fileSigned,
     });
 
-    if (thumbnailData) {
+    if (thumbnailBuffer) {
       try {
-        await uploadThumbnail(fileId, thumbnailData, dataKeyVersion);
+        const { uploadId } = await trpc().upload.startFileThumbnailUpload.mutate({
+          file: fileId,
+          dekVersion: dataKeyVersion,
+        });
+
+        await uploadBlob(uploadId, new Blob([thumbnailBuffer]), dataKey);
+
+        await trpc().upload.completeFileThumbnailUpload.mutate({ uploadId });
       } catch (e) {
-        // TODO: Error handling for thumbnail upload
         console.error(e);
       }
     }
 
     state.status = "uploaded";
-
-    return { fileId, thumbnailBuffer: thumbnailData?.plaintext };
+    return { fileId };
   },
   { concurrency: 1 },
 );
 
-const requestFileUpload = async (
-  state: FileUploadState,
-  file: File,
-  masterKey: MasterKey,
-  hmacSecret: HmacSecret,
-  fileSigned: string,
-  parentId: DirectoryId,
-) => {
-  state.status = "uploading";
-
-  const fileType = getFileType(file);
-  const { dataKey, dataKeyVersion } = await generateDataKey();
-  const dataKeyWrapped = await wrapDataKey(dataKey, masterKey.key);
-
-  const nameEncrypted = await encryptString(file.name, dataKey);
-  const lastModifiedAtEncrypted = await encryptString(file.lastModified.toString(), dataKey);
-
-  const totalChunks = Math.ceil(file.size / CHUNK_SIZE);
-  const metadata = {
-    chunks: totalChunks,
-    parent: parentId,
-    mekVersion: masterKey.version,
-    dek: dataKeyWrapped,
-    dekVersion: dataKeyVersion,
-    hskVersion: hmacSecret.version,
-    contentType: fileType,
-    name: nameEncrypted.ciphertext,
-    nameIv: nameEncrypted.iv,
-    lastModifiedAt: lastModifiedAtEncrypted.ciphertext,
-    lastModifiedAtIv: lastModifiedAtEncrypted.iv,
-  };
-
-  const { uploadId } = await trpc().upload.startFileUpload.mutate(metadata);
-
-  const reader = file.stream().getReader();
-  const limit = pLimit(4);
-  let buffer = new Uint8Array(0);
-  let chunkIndex = 0;
-  const uploadPromises: Promise<void>[] = [];
-
-  const totalBytes = file.size;
-  let uploadedBytes = 0;
-  const startTime = Date.now();
-
-  const uploadChunk = async (
-    index: number,
-    encryptedChunk: ArrayBuffer,
-    chunkHash: string,
-    originalChunkSize: number,
-  ) => {
-    const response = await fetch(`/api/upload/${uploadId}/chunks/${index}`, {
-      method: "POST",
-      headers: {
-        "Content-Type": "application/octet-stream",
-        "Content-Digest": `sha-256=:${chunkHash}:`,
-      },
-      body: encryptedChunk,
-    });
-
-    if (!response.ok) {
-      throw new Error(`Chunk upload failed: ${response.status} ${response.statusText}`);
-    }
-
-    uploadedBytes += originalChunkSize;
-    const elapsed = (Date.now() - startTime) / 1000;
-    const rate = uploadedBytes / elapsed;
-    const remaining = totalBytes - uploadedBytes;
-    const estimated = rate > 0 ? remaining / rate : undefined;
-
-    state.progress = uploadedBytes / totalBytes;
-    state.rate = rate;
-    state.estimated = estimated;
-  };
-
-  while (true) {
-    const { done, value } = await reader.read();
-    if (done && buffer.length === 0) break;
-
-    if (value) {
-      const newBuffer = new Uint8Array(buffer.length + value.length);
-      newBuffer.set(buffer);
-      newBuffer.set(value, buffer.length);
-      buffer = newBuffer;
-    }
-
-    while (buffer.length >= CHUNK_SIZE || (done && buffer.length > 0)) {
-      const chunkSize = Math.min(CHUNK_SIZE, buffer.length);
-      const chunk = buffer.slice(0, chunkSize);
-      buffer = buffer.slice(chunkSize);
-
-      const encryptedChunk = await encryptChunk(chunk.buffer.slice(0, chunk.byteLength), dataKey);
-      const chunkHash = encodeToBase64(await digestMessage(encryptedChunk));
-      const currentIndex = chunkIndex++;
-
-      uploadPromises.push(
-        limit(() => uploadChunk(currentIndex, encryptedChunk, chunkHash, chunkSize)),
-      );
-    }
-
-    if (done) break;
-  }
-
-  await Promise.all(uploadPromises);
-
-  const { file: fileId } = await trpc().upload.completeFileUpload.mutate({
-    uploadId,
-    contentHmac: fileSigned,
-  });
-
-  if (fileType.startsWith("video/")) {
-    try {
-      const thumbnail = await generateThumbnailFromFile(file);
-      if (thumbnail) {
-        const thumbnailBuffer = await thumbnail.arrayBuffer();
-        const thumbnailEncrypted = await encryptData(thumbnailBuffer, dataKey);
-
-        await uploadThumbnail(fileId, thumbnailEncrypted, dataKeyVersion);
-      }
-    } catch (e) {
-      // Thumbnail upload failure is not critical
-      console.error(e);
-    }
-  }
-
-  state.status = "uploaded";
-
-  return { fileId };
-};
-
 export const uploadFile = async (
   file: File,
   parentId: "root" | number,
-  hmacSecret: HmacSecret,
   masterKey: MasterKey,
+  hmacSecret: HmacSecret,
   onDuplicate: () => Promise<boolean>,
 ) => {
   uploadingFiles.push({
@@ -413,65 +215,44 @@ export const uploadFile = async (
   const state = uploadingFiles.at(-1)!;
 
   return await scheduler.schedule(file.size, async () => {
-    state.status = "encryption-pending";
-
     try {
-      const { fileSigned } = await requestDuplicateFileScan(file, hmacSecret, onDuplicate);
+      const { fileSigned } = await requestDuplicateFileScan(state, file, hmacSecret, onDuplicate);
+
       if (!fileSigned) {
         state.status = "canceled";
         uploadingFiles = uploadingFiles.filter((file) => file !== state);
         return;
       }
 
+      let fileBuffer;
       const fileType = getFileType(file);
+      const fileMetadata: FileMetadata = {
+        parentId,
+        name: file.name,
+        lastModifiedAt: new Date(file.lastModified),
+      };
+
       if (fileType.startsWith("image/")) {
-        const fileBuffer = await file.arrayBuffer();
-        const {
-          dataKeyWrapped,
-          dataKeyVersion,
-          chunksEncrypted,
-          nameEncrypted,
-          createdAtEncrypted,
-          lastModifiedAtEncrypted,
-          thumbnail,
-        } = await encryptImageFile(state, file, masterKey);
-
-        const metadata = {
-          chunks: chunksEncrypted.length,
-          parent: parentId,
-          mekVersion: masterKey.version,
-          dek: dataKeyWrapped,
-          dekVersion: dataKeyVersion,
-          hskVersion: hmacSecret.version,
-          contentType: fileType,
-          name: nameEncrypted.ciphertext,
-          nameIv: nameEncrypted.iv,
-          createdAt: createdAtEncrypted?.ciphertext,
-          createdAtIv: createdAtEncrypted?.iv,
-          lastModifiedAt: lastModifiedAtEncrypted.ciphertext,
-          lastModifiedAtIv: lastModifiedAtEncrypted.iv,
-        };
-
-        const { fileId, thumbnailBuffer } = await requestImageFileUpload(
-          state,
-          metadata,
-          chunksEncrypted,
-          fileSigned,
-          thumbnail ?? null,
-          dataKeyVersion,
-        );
-        return { fileId, fileBuffer, thumbnailBuffer };
-      } else {
-        const { fileId } = await requestFileUpload(
-          state,
-          file,
-          masterKey,
-          hmacSecret,
-          fileSigned,
-          parentId,
-        );
-        return { fileId };
+        fileBuffer = await file.arrayBuffer();
+        fileMetadata.createdAt = extractExifDateTime(fileBuffer);
       }
+
+      const blob = new Blob([file], { type: fileType });
+
+      const { uploadId, thumbnailBuffer, dataKey, dataKeyVersion } =
+        await requestFileMetadataEncryption(state, blob, fileMetadata, masterKey, hmacSecret);
+
+      const { fileId } = await requestFileUpload(
+        state,
+        uploadId,
+        blob,
+        fileSigned,
+        thumbnailBuffer,
+        dataKey,
+        dataKeyVersion,
+      );
+
+      return { fileId, fileBuffer, thumbnailBuffer };
     } catch (e) {
       state.status = "error";
       throw e;

src/lib/modules/thumbnail.ts

@@ -52,7 +52,6 @@ const generateImageThumbnail = (imageUrl: string) => {
         .catch(reject);
     };
     image.onerror = reject;
-
     image.src = imageUrl;
   });
 };
@@ -85,31 +84,27 @@ const generateVideoThumbnail = (videoUrl: string, time = 0) => {
   });
 };
 
-export const generateThumbnail = async (fileBuffer: ArrayBuffer, fileType: string) => {
+export const generateThumbnail = async (blob: Blob) => {
   let url;
   try {
-    if (fileType.startsWith("image/")) {
-      const fileBlob = new Blob([fileBuffer], { type: fileType });
-      url = URL.createObjectURL(fileBlob);
-
+    if (blob.type.startsWith("image/")) {
+      url = URL.createObjectURL(blob);
       try {
         return await generateImageThumbnail(url);
       } catch {
         URL.revokeObjectURL(url);
         url = undefined;
 
-        if (fileType === "image/heic") {
+        if (blob.type === "image/heic") {
           const { default: heic2any } = await import("heic2any");
-          url = URL.createObjectURL(
-            (await heic2any({ blob: fileBlob, toType: "image/png" })) as Blob,
-          );
+          url = URL.createObjectURL((await heic2any({ blob, 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 }));
+    } else if (blob.type.startsWith("video/")) {
+      url = URL.createObjectURL(blob);
       return await generateVideoThumbnail(url);
     }
     return null;
@@ -122,22 +117,6 @@ export const generateThumbnail = async (fileBuffer: ArrayBuffer, fileType: strin
   }
 };
 
-export const generateThumbnailFromFile = async (file: File) => {
-  if (!file.type.startsWith("video/")) return null;
-
-  let url;
-  try {
-    url = URL.createObjectURL(file);
-    return await generateVideoThumbnail(url);
-  } catch {
-    return null;
-  } finally {
-    if (url) {
-      URL.revokeObjectURL(url);
-    }
-  }
-};
-
 export const getThumbnailUrl = (thumbnailBuffer: ArrayBuffer) => {
   return `data:image/webp;base64,${encodeToBase64(thumbnailBuffer)}`;
 };

src/lib/modules/upload.ts

@@ -0,0 +1,183 @@
+import axios from "axios";
+import pLimit from "p-limit";
+import { ENCRYPTION_OVERHEAD, CHUNK_SIZE } from "$lib/constants";
+import { encryptChunk, digestMessage, encodeToBase64 } from "$lib/modules/crypto";
+import { BoundedQueue } from "$lib/utils";
+
+interface UploadStats {
+  progress: number;
+  rate: number;
+}
+
+interface EncryptedChunk {
+  index: number;
+  data: ArrayBuffer;
+  hash: string;
+}
+
+const createSpeedMeter = (timeWindow = 3000, minInterval = 200, warmupPeriod = 500) => {
+  const samples: { t: number; b: number }[] = [];
+  let lastSpeed = 0;
+  let startTime: number | null = null;
+
+  return (bytesNow?: number) => {
+    if (bytesNow === undefined) return lastSpeed;
+
+    const now = performance.now();
+
+    // Initialize start time on first call
+    if (startTime === null) {
+      startTime = now;
+    }
+
+    // Check if enough time has passed since the last sample
+    const lastSample = samples[samples.length - 1];
+    if (lastSample && now - lastSample.t < minInterval) {
+      return lastSpeed;
+    }
+
+    samples.push({ t: now, b: bytesNow });
+
+    // Remove old samples outside the time window
+    const cutoff = now - timeWindow;
+    while (samples.length > 2 && samples[0]!.t < cutoff) samples.shift();
+
+    // Need at least 2 samples to calculate speed
+    if (samples.length < 2) {
+      return lastSpeed;
+    }
+
+    const first = samples[0]!;
+    const dt = now - first.t;
+    const db = bytesNow - first.b;
+
+    if (dt >= minInterval) {
+      const instantSpeed = (db / dt) * 1000;
+      // Apply EMA for smoother speed transitions
+      const alpha = 0.3;
+      const rawSpeed =
+        lastSpeed === 0 ? instantSpeed : alpha * instantSpeed + (1 - alpha) * lastSpeed;
+
+      // Apply warmup ramp to prevent initial overestimation
+      const elapsed = now - startTime;
+      const warmupWeight = Math.min(1, elapsed / warmupPeriod);
+      lastSpeed = rawSpeed * warmupWeight;
+    }
+
+    return lastSpeed;
+  };
+};
+
+const encryptChunkData = async (
+  chunk: Blob,
+  dataKey: CryptoKey,
+): Promise<{ data: ArrayBuffer; hash: string }> => {
+  const encrypted = await encryptChunk(await chunk.arrayBuffer(), dataKey);
+  const hash = encodeToBase64(await digestMessage(encrypted));
+  return { data: encrypted, hash };
+};
+
+const uploadEncryptedChunk = async (
+  uploadId: string,
+  chunkIndex: number,
+  encrypted: ArrayBuffer,
+  hash: string,
+  onChunkProgress: (chunkIndex: number, loaded: number) => void,
+) => {
+  await axios.post(`/api/upload/${uploadId}/chunks/${chunkIndex + 1}`, encrypted, {
+    headers: {
+      "Content-Type": "application/octet-stream",
+      "Content-Digest": `sha-256=:${hash}:`,
+    },
+    onUploadProgress(e) {
+      onChunkProgress(chunkIndex, e.loaded ?? 0);
+    },
+  });
+
+  onChunkProgress(chunkIndex, encrypted.byteLength);
+};
+
+export const uploadBlob = async (
+  uploadId: string,
+  blob: Blob,
+  dataKey: CryptoKey,
+  options?: { concurrency?: number; onProgress?: (s: UploadStats) => void },
+) => {
+  const onProgress = options?.onProgress;
+  const networkConcurrency = options?.concurrency ?? 4;
+  const maxQueueSize = 8;
+
+  const totalChunks = Math.ceil(blob.size / CHUNK_SIZE);
+  const totalBytes = blob.size + totalChunks * ENCRYPTION_OVERHEAD;
+
+  const uploadedByChunk = new Array<number>(totalChunks).fill(0);
+  const speedMeter = createSpeedMeter(3000, 200);
+
+  const emit = () => {
+    if (!onProgress) return;
+
+    const uploadedBytes = uploadedByChunk.reduce((a, b) => a + b, 0);
+    const rate = speedMeter(uploadedBytes);
+    const progress = Math.min(1, uploadedBytes / totalBytes);
+
+    onProgress({ progress, rate });
+  };
+
+  const onChunkProgress = (idx: number, loaded: number) => {
+    uploadedByChunk[idx] = loaded;
+    emit();
+  };
+
+  const queue = new BoundedQueue<EncryptedChunk>(maxQueueSize);
+  let encryptionError: Error | null = null;
+
+  // Producer: encrypt chunks and push to queue
+  const encryptionProducer = async () => {
+    try {
+      for (let i = 0; i < totalChunks; i++) {
+        const chunk = blob.slice(i * CHUNK_SIZE, (i + 1) * CHUNK_SIZE);
+        const { data, hash } = await encryptChunkData(chunk, dataKey);
+        await queue.push({ index: i, data, hash });
+      }
+    } catch (e) {
+      encryptionError = e instanceof Error ? e : new Error(String(e));
+    } finally {
+      queue.close();
+    }
+  };
+
+  // Consumer: upload chunks from queue with concurrency limit
+  const uploadConsumer = async () => {
+    const limit = pLimit(networkConcurrency);
+    const activeTasks = new Set<Promise<void>>();
+
+    while (true) {
+      const item = await queue.pop();
+      if (item === null) break;
+      if (encryptionError) throw encryptionError;
+
+      const task = limit(async () => {
+        try {
+          await uploadEncryptedChunk(uploadId, item.index, item.data, item.hash, onChunkProgress);
+        } finally {
+          // @ts-ignore
+          item.data = null;
+        }
+      });
+
+      activeTasks.add(task);
+      task.finally(() => activeTasks.delete(task));
+
+      if (activeTasks.size >= networkConcurrency) {
+        await Promise.race(activeTasks);
+      }
+    }
+
+    await Promise.all(activeTasks);
+  };
+
+  // Run producer and consumer concurrently
+  await Promise.all([encryptionProducer(), uploadConsumer()]);
+
+  onProgress?.({ progress: 1, rate: speedMeter() });
+};

src/lib/server/db/error.ts

@@ -9,6 +9,7 @@ type IntegrityErrorMessages =
   // File
   | "Directory not found"
   | "File not found"
+  | "File is not legacy"
   | "File not found in category"
   | "File already added to category"
   | "Invalid DEK version"

src/lib/server/db/file.ts

@@ -334,6 +334,16 @@ export const getAllFileIds = async (userId: number) => {
   return files.map(({ id }) => id);
 };
 
+export const getLegacyFileIds = async (userId: number) => {
+  const files = await db
+    .selectFrom("file")
+    .select("id")
+    .where("user_id", "=", userId)
+    .where("encrypted_content_iv", "is not", null)
+    .execute();
+  return files.map(({ id }) => id);
+};
+
 export const getAllFileIdsByContentHmac = async (
   userId: number,
   hskVersion: number,
@@ -482,6 +492,51 @@ export const unregisterFile = async (userId: number, fileId: number) => {
   });
 };
 
+export const migrateFileContent = async (
+  trx: typeof db,
+  userId: number,
+  fileId: number,
+  newPath: string,
+  dekVersion: Date,
+  encContentHash: string,
+) => {
+  const file = await trx
+    .selectFrom("file")
+    .select(["path", "data_encryption_key_version", "encrypted_content_iv"])
+    .where("id", "=", fileId)
+    .where("user_id", "=", userId)
+    .limit(1)
+    .forUpdate()
+    .executeTakeFirst();
+  if (!file) {
+    throw new IntegrityError("File not found");
+  } else if (file.data_encryption_key_version.getTime() !== dekVersion.getTime()) {
+    throw new IntegrityError("Invalid DEK version");
+  } else if (!file.encrypted_content_iv) {
+    throw new IntegrityError("File is not legacy");
+  }
+
+  await trx
+    .updateTable("file")
+    .set({
+      path: newPath,
+      encrypted_content_iv: null,
+      encrypted_content_hash: encContentHash,
+    })
+    .where("id", "=", fileId)
+    .where("user_id", "=", userId)
+    .execute();
+  await trx
+    .insertInto("file_log")
+    .values({
+      file_id: fileId,
+      timestamp: new Date(),
+      action: "migrate",
+    })
+    .execute();
+  return { oldPath: file.path };
+};
+
 export const addFileToCategory = async (fileId: number, categoryId: number) => {
   await db.transaction().execute(async (trx) => {
     try {

src/lib/server/db/migrations/1768062380-AddChunkedUpload.ts

@@ -21,8 +21,14 @@ export const up = async (db: Kysely<any>) => {
     .addColumn("type", "text", (col) => col.notNull())
     .addColumn("user_id", "integer", (col) => col.references("user.id").notNull())
     .addColumn("path", "text", (col) => col.notNull())
+    .addColumn("bitmap", "bytea", (col) => col.notNull())
     .addColumn("total_chunks", "integer", (col) => col.notNull())
-    .addColumn("uploaded_chunks", sql`integer[]`, (col) => col.notNull().defaultTo(sql`'{}'`))
+    .addColumn("uploaded_chunks", "integer", (col) =>
+      col
+        .generatedAlwaysAs(sql`bit_count(bitmap)`)
+        .stored()
+        .notNull(),
+    )
     .addColumn("expires_at", "timestamp(3)", (col) => col.notNull())
     .addColumn("parent_id", "integer", (col) => col.references("directory.id"))
     .addColumn("master_encryption_key_version", "integer")
@@ -46,6 +52,11 @@ export const up = async (db: Kysely<any>) => {
       "hmac_secret_key",
       ["user_id", "version"],
     )
+    .addCheckConstraint(
+      "upload_session_ck01",
+      sql`length(bitmap) = ceil(total_chunks / 8.0)::integer`,
+    )
+    .addCheckConstraint("upload_session_ck02", sql`uploaded_chunks <= total_chunks`)
     .execute();
 };
 

src/lib/server/db/schema/file.ts

@@ -41,7 +41,7 @@ interface FileLogTable {
   id: Generated<number>;
   file_id: number;
   timestamp: ColumnType<Date, Date, never>;
-  action: "create" | "rename" | "add-to-category" | "remove-from-category";
+  action: "create" | "rename" | "migrate" | "add-to-category" | "remove-from-category";
   new_name: Ciphertext | null;
   category_id: number | null;
 }

src/lib/server/db/schema/upload.ts

@@ -3,14 +3,14 @@ import type { Ciphertext } from "./utils";
 
 interface UploadSessionTable {
   id: string;
-  type: "file" | "thumbnail";
+  type: "file" | "thumbnail" | "migration";
   user_id: number;
   path: string;
+  bitmap: Buffer;
   total_chunks: number;
-  uploaded_chunks: Generated<number[]>;
+  uploaded_chunks: Generated<number>;
   expires_at: Date;
 
-  // For file uploads
   parent_id: number | null;
   master_encryption_key_version: number | null;
   encrypted_data_encryption_key: string | null; // Base64
@@ -20,8 +20,6 @@ interface UploadSessionTable {
   encrypted_name: Ciphertext | null;
   encrypted_created_at: Ciphertext | null;
   encrypted_last_modified_at: Ciphertext | null;
-
-  // For thumbnail uploads
   file_id: number | null;
 }
 

src/lib/server/db/upload.ts

@@ -7,8 +7,9 @@ interface BaseUploadSession {
   id: string;
   userId: number;
   path: string;
+  bitmap: Buffer;
   totalChunks: number;
-  uploadedChunks: number[];
+  uploadedChunks: number;
   expiresAt: Date;
 }
 
@@ -25,14 +26,14 @@ interface FileUploadSession extends BaseUploadSession {
   encLastModifiedAt: Ciphertext;
 }
 
-interface ThumbnailUploadSession extends BaseUploadSession {
-  type: "thumbnail";
+interface ThumbnailOrMigrationUploadSession extends BaseUploadSession {
+  type: "thumbnail" | "migration";
   fileId: number;
   dekVersion: Date;
 }
 
 export const createFileUploadSession = async (
-  params: Omit<FileUploadSession, "type" | "uploadedChunks">,
+  params: Omit<FileUploadSession, "type" | "bitmap" | "uploadedChunks">,
 ) => {
   await db.transaction().execute(async (trx) => {
     const mek = await trx
@@ -68,6 +69,7 @@ export const createFileUploadSession = async (
         type: "file",
         user_id: params.userId,
         path: params.path,
+        bitmap: Buffer.alloc(Math.ceil(params.totalChunks / 8)),
         total_chunks: params.totalChunks,
         expires_at: params.expiresAt,
         parent_id: params.parentId !== "root" ? params.parentId : null,
@@ -84,8 +86,8 @@ export const createFileUploadSession = async (
   });
 };
 
-export const createThumbnailUploadSession = async (
-  params: Omit<ThumbnailUploadSession, "type" | "uploadedChunks">,
+export const createThumbnailOrMigrationUploadSession = async (
+  params: Omit<ThumbnailOrMigrationUploadSession, "bitmap" | "uploadedChunks">,
 ) => {
   await db.transaction().execute(async (trx) => {
     const file = await trx
@@ -106,9 +108,10 @@ export const createThumbnailUploadSession = async (
       .insertInto("upload_session")
       .values({
         id: params.id,
-        type: "thumbnail",
+        type: params.type,
         user_id: params.userId,
         path: params.path,
+        bitmap: Buffer.alloc(Math.ceil(params.totalChunks / 8)),
         total_chunks: params.totalChunks,
         expires_at: params.expiresAt,
         file_id: params.fileId,
@@ -135,6 +138,7 @@ export const getUploadSession = async (sessionId: string, userId: number) => {
       id: session.id,
       userId: session.user_id,
       path: session.path,
+      bitmap: session.bitmap,
       totalChunks: session.total_chunks,
       uploadedChunks: session.uploaded_chunks,
       expiresAt: session.expires_at,
@@ -150,23 +154,26 @@ export const getUploadSession = async (sessionId: string, userId: number) => {
     } satisfies FileUploadSession;
   } else {
     return {
-      type: "thumbnail",
+      type: session.type,
       id: session.id,
       userId: session.user_id,
       path: session.path,
+      bitmap: session.bitmap,
       totalChunks: session.total_chunks,
       uploadedChunks: session.uploaded_chunks,
       expiresAt: session.expires_at,
       fileId: session.file_id!,
       dekVersion: session.data_encryption_key_version!,
-    } satisfies ThumbnailUploadSession;
+    } satisfies ThumbnailOrMigrationUploadSession;
   }
 };
 
 export const markChunkAsUploaded = async (sessionId: string, chunkIndex: number) => {
   await db
     .updateTable("upload_session")
-    .set({ uploaded_chunks: sql`array_append(uploaded_chunks, ${chunkIndex})` })
+    .set({
+      bitmap: sql`set_bit(${sql.ref("bitmap")}, ${chunkIndex - 1}, 1)`,
+    })
     .where("id", "=", sessionId)
     .execute();
 };

src/lib/server/services/upload.ts

@@ -8,6 +8,12 @@ import { safeRecursiveRm, safeUnlink } from "$lib/server/modules/filesystem";
 
 const chunkLocks = new Set<string>();
 
+const isChunkUploaded = (bitmap: Buffer, chunkIndex: number) => {
+  chunkIndex -= 1;
+  const byte = bitmap[Math.floor(chunkIndex / 8)];
+  return !!byte && (byte & (1 << (chunkIndex % 8))) !== 0; // Postgres sucks
+};
+
 export const uploadChunk = async (
   userId: number,
   sessionId: string,
@@ -28,13 +34,13 @@ export const uploadChunk = async (
     const session = await UploadRepo.getUploadSession(sessionId, userId);
     if (!session) {
       error(404, "Invalid upload id");
-    } else if (chunkIndex >= session.totalChunks) {
+    } else if (chunkIndex > session.totalChunks) {
       error(400, "Invalid chunk index");
-    } else if (session.uploadedChunks.includes(chunkIndex)) {
+    } else if (isChunkUploaded(session.bitmap, chunkIndex)) {
       error(409, "Chunk already uploaded");
     }
 
-    const isLastChunk = chunkIndex === session.totalChunks - 1;
+    const isLastChunk = chunkIndex === session.totalChunks;
     filePath = `${session.path}/${chunkIndex}`;
 
     const hashStream = createHash("sha256");

src/lib/services/file.ts

@@ -1,5 +1,4 @@
 import { getAllFileInfos } from "$lib/indexedDB/filesystem";
-import { encodeToBase64, digestMessage } from "$lib/modules/crypto";
 import {
   getFileCache,
   storeFileCache,
@@ -7,6 +6,7 @@ import {
   downloadFile,
   deleteFileThumbnailCache,
 } from "$lib/modules/file";
+import { uploadBlob } from "$lib/modules/upload";
 import { trpc } from "$trpc/client";
 
 export const requestFileDownload = async (
@@ -24,41 +24,24 @@ export const requestFileDownload = async (
 
 export const requestFileThumbnailUpload = async (
   fileId: number,
+  thumbnail: Blob,
+  dataKey: CryptoKey,
   dataKeyVersion: Date,
-  thumbnailEncrypted: { ciphertext: ArrayBuffer; iv: ArrayBuffer },
 ) => {
-  const { uploadId } = await trpc().upload.startFileThumbnailUpload.mutate({
-    file: fileId,
-    dekVersion: dataKeyVersion,
-  });
+  try {
+    const { uploadId } = await trpc().upload.startFileThumbnailUpload.mutate({
+      file: fileId,
+      dekVersion: dataKeyVersion,
+    });
 
-  // Prepend IV to ciphertext (consistent with file download format)
-  const ivAndCiphertext = new Uint8Array(
-    thumbnailEncrypted.iv.byteLength + thumbnailEncrypted.ciphertext.byteLength,
-  );
-  ivAndCiphertext.set(new Uint8Array(thumbnailEncrypted.iv), 0);
-  ivAndCiphertext.set(
-    new Uint8Array(thumbnailEncrypted.ciphertext),
-    thumbnailEncrypted.iv.byteLength,
-  );
+    await uploadBlob(uploadId, thumbnail, dataKey);
 
-  const chunkHash = encodeToBase64(await digestMessage(ivAndCiphertext));
-
-  const response = await fetch(`/api/upload/${uploadId}/chunks/0`, {
-    method: "POST",
-    headers: {
-      "Content-Type": "application/octet-stream",
-      "Content-Digest": `sha-256=:${chunkHash}:`,
-    },
-    body: ivAndCiphertext,
-  });
-
-  if (!response.ok) {
-    throw new Error(`Thumbnail upload failed: ${response.status} ${response.statusText}`);
+    await trpc().upload.completeFileThumbnailUpload.mutate({ uploadId });
+    return true;
+  } catch {
+    // TODO: Error Handling
+    return false;
   }
-
-  await trpc().upload.completeFileThumbnailUpload.mutate({ uploadId });
-  return response;
 };
 
 export const requestDeletedFilesCleanup = async () => {

src/lib/utils/concurrency/BoundedQueue.ts

@@ -0,0 +1,44 @@
+export class BoundedQueue<T> {
+  private isClosed = false;
+  private reservedCount = 0;
+  private items: T[] = [];
+
+  private waitersNotFull: (() => void)[] = [];
+  private waitersNotEmpty: (() => void)[] = [];
+
+  constructor(private readonly maxSize: number) {}
+
+  async push(item: T) {
+    if (this.isClosed) {
+      throw new Error("Queue closed");
+    }
+
+    while (this.reservedCount >= this.maxSize) {
+      await new Promise<void>((resolve) => this.waitersNotFull.push(resolve));
+      if (this.isClosed) throw new Error("Queue closed");
+    }
+
+    this.reservedCount++;
+    this.items.push(item);
+    this.waitersNotEmpty.shift()?.();
+  }
+
+  async pop() {
+    while (this.items.length === 0) {
+      if (this.isClosed) return null;
+      await new Promise<void>((resolve) => this.waitersNotEmpty.push(resolve));
+    }
+
+    const item = this.items.shift()!;
+    this.reservedCount--;
+    this.waitersNotFull.shift()?.();
+
+    return item;
+  }
+
+  close() {
+    this.isClosed = true;
+    while (this.waitersNotEmpty.length > 0) this.waitersNotEmpty.shift()!();
+    while (this.waitersNotFull.length > 0) this.waitersNotFull.shift()!();
+  }
+}

src/lib/utils/concurrency/index.ts

@@ -0,0 +1,3 @@
+export * from "./BoundedQueue";
+export * from "./HybridPromise";
+export * from "./Scheduler";

src/lib/utils/index.ts

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

src/routes/(fullscreen)/file/[id]/service.ts

@@ -1,4 +1,3 @@
-import { encryptData } from "$lib/modules/crypto";
 import { storeFileThumbnailCache } from "$lib/modules/file";
 import { prepareFileDecryption, getDecryptedFileUrl } from "$lib/serviceWorker";
 import { requestFileThumbnailUpload } from "$lib/services/file";
@@ -33,12 +32,10 @@ export const requestThumbnailUpload = async (
   dataKey: CryptoKey,
   dataKeyVersion: Date,
 ) => {
-  const thumbnailBuffer = await thumbnail.arrayBuffer();
-  const thumbnailEncrypted = await encryptData(thumbnailBuffer, dataKey);
-  const res = await requestFileThumbnailUpload(fileId, dataKeyVersion, thumbnailEncrypted);
-  if (!res.ok) return false;
+  const res = await requestFileThumbnailUpload(fileId, thumbnail, dataKey, dataKeyVersion);
+  if (!res) return false;
 
-  storeFileThumbnailCache(fileId, thumbnailBuffer); // Intended
+  void thumbnail.arrayBuffer().then((buffer) => storeFileThumbnailCache(fileId, buffer));
   return true;
 };
 

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

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

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

@@ -0,0 +1,79 @@
+<script lang="ts">
+  import { onMount } from "svelte";
+  import { goto } from "$app/navigation";
+  import { BottomDiv, Button, FullscreenDiv } from "$lib/components/atoms";
+  import { TopBar } from "$lib/components/molecules";
+  import { bulkGetFileInfo, type MaybeFileInfo } from "$lib/modules/filesystem";
+  import { masterKeyStore } from "$lib/stores";
+  import { sortEntries } from "$lib/utils";
+  import File from "./File.svelte";
+  import { getMigrationState, clearMigrationStates, requestFileMigration } from "./service.svelte";
+
+  let { data } = $props();
+
+  let fileInfos: MaybeFileInfo[] = $state([]);
+  let files = $derived(
+    fileInfos
+      .map((info) => ({
+        info,
+        state: getMigrationState(info.id),
+      }))
+      .filter((file) => file.state?.status !== "uploaded"),
+  );
+
+  const migrateAllFiles = () => {
+    files.forEach(({ info }) => {
+      if (info.exists) {
+        requestFileMigration(info);
+      }
+    });
+  };
+
+  onMount(async () => {
+    fileInfos = sortEntries(
+      Array.from((await bulkGetFileInfo(data.files, $masterKeyStore?.get(1)?.key!)).values()),
+    );
+  });
+
+  $effect(() => clearMigrationStates);
+</script>
+
+<svelte:head>
+  <title>암호화 마이그레이션</title>
+</svelte:head>
+
+<TopBar title="암호화 마이그레이션" />
+<FullscreenDiv>
+  {#if files.length > 0}
+    <div class="space-y-4 pb-4">
+      <p class="break-keep text-gray-800">
+        이전 버전의 ArkVault에서 업로드된 {files.length}개 파일을 다시 암호화할 수 있어요.
+      </p>
+      <div class="space-y-2">
+        {#each files as { info, state } (info.id)}
+          {#if info.exists}
+            <File
+              {info}
+              {state}
+              onclick={({ id }) => goto(`/file/${id}`)}
+              onMigrateClick={requestFileMigration}
+            />
+          {/if}
+        {/each}
+      </div>
+    </div>
+    <BottomDiv>
+      <Button onclick={migrateAllFiles} class="w-full">모두 다시 암호화하기</Button>
+    </BottomDiv>
+  {:else}
+    <div class="flex flex-grow items-center justify-center">
+      <p class="text-gray-500">
+        {#if data.files.length === 0}
+          마이그레이션할 파일이 없어요.
+        {:else}
+          파일 목록을 불러오고 있어요.
+        {/if}
+      </p>
+    </div>
+  {/if}
+</FullscreenDiv>

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

@@ -0,0 +1,52 @@
+<script module lang="ts">
+  const subtexts = {
+    queued: "대기 중",
+    downloading: "다운로드하는 중",
+    "upload-pending": "업로드를 기다리는 중",
+    uploaded: "",
+    error: "실패",
+  } as const;
+</script>
+
+<script lang="ts">
+  import { ActionEntryButton } from "$lib/components/atoms";
+  import { DirectoryEntryLabel } from "$lib/components/molecules";
+  import type { FileInfo } from "$lib/modules/filesystem";
+  import { formatDateTime, formatNetworkSpeed } from "$lib/utils";
+  import type { MigrationState } from "./service.svelte";
+
+  import IconSync from "~icons/material-symbols/sync";
+
+  type FileInfoWithExists = FileInfo & { exists: true };
+
+  interface Props {
+    info: FileInfoWithExists;
+    onclick: (file: FileInfo) => void;
+    onMigrateClick: (file: FileInfoWithExists) => void;
+    state: MigrationState | undefined;
+  }
+
+  let { info, onclick, onMigrateClick, state }: Props = $props();
+
+  let subtext = $derived.by(() => {
+    if (!state) {
+      return formatDateTime(info.createdAt ?? info.lastModifiedAt);
+    }
+    if (state.status === "uploading") {
+      const progress = Math.floor((state.progress ?? 0) * 100);
+      const speed = formatNetworkSpeed((state.rate ?? 0) * 8);
+      return `전송됨 ${progress}% · ${speed}`;
+    }
+    return subtexts[state.status] ?? state.status;
+  });
+</script>
+
+<ActionEntryButton
+  class="h-14"
+  onclick={() => onclick(info)}
+  actionButtonIcon={!state || state.status === "error" ? IconSync : undefined}
+  onActionButtonClick={() => onMigrateClick(info)}
+  actionButtonClass="text-gray-800"
+>
+  <DirectoryEntryLabel type="file" name={info.name} {subtext} />
+</ActionEntryButton>

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

@@ -0,0 +1,105 @@
+import { limitFunction } from "p-limit";
+import { SvelteMap } from "svelte/reactivity";
+import { CHUNK_SIZE } from "$lib/constants";
+import type { FileInfo } from "$lib/modules/filesystem";
+import { uploadBlob } from "$lib/modules/upload";
+import { requestFileDownload } from "$lib/services/file";
+import { Scheduler } from "$lib/utils";
+import { trpc } from "$trpc/client";
+
+export type MigrationStatus =
+  | "queued"
+  | "downloading"
+  | "upload-pending"
+  | "uploading"
+  | "uploaded"
+  | "error";
+
+export interface MigrationState {
+  status: MigrationStatus;
+  progress?: number;
+  rate?: number;
+}
+
+const scheduler = new Scheduler();
+const states = new SvelteMap<number, MigrationState>();
+
+const createState = (status: MigrationStatus): MigrationState => {
+  const state = $state({ status });
+  return state;
+};
+
+export const getMigrationState = (fileId: number) => {
+  return states.get(fileId);
+};
+
+export const clearMigrationStates = () => {
+  for (const [id, state] of states) {
+    if (state.status === "uploaded" || state.status === "error") {
+      states.delete(id);
+    }
+  }
+};
+
+const requestFileUpload = limitFunction(
+  async (
+    state: MigrationState,
+    fileId: number,
+    fileBuffer: ArrayBuffer,
+    dataKey: CryptoKey,
+    dataKeyVersion: Date,
+  ) => {
+    state.status = "uploading";
+
+    const { uploadId } = await trpc().upload.startMigrationUpload.mutate({
+      file: fileId,
+      chunks: Math.ceil(fileBuffer.byteLength / CHUNK_SIZE),
+      dekVersion: dataKeyVersion,
+    });
+
+    await uploadBlob(uploadId, new Blob([fileBuffer]), dataKey, {
+      onProgress(s) {
+        state.progress = s.progress;
+        state.rate = s.rate;
+      },
+    });
+
+    await trpc().upload.completeMigrationUpload.mutate({ uploadId });
+    state.status = "uploaded";
+  },
+  { concurrency: 1 },
+);
+
+export const requestFileMigration = async (fileInfo: FileInfo) => {
+  let state = states.get(fileInfo.id);
+  if (state) {
+    if (state.status !== "error") return;
+    state.status = "queued";
+    state.progress = undefined;
+    state.rate = undefined;
+  } else {
+    state = createState("queued");
+    states.set(fileInfo.id, state);
+  }
+
+  try {
+    const dataKey = fileInfo.dataKey;
+    if (!dataKey) {
+      throw new Error("Data key not available");
+    }
+
+    let fileBuffer: ArrayBuffer | undefined;
+
+    await scheduler.schedule(
+      async () => {
+        state.status = "downloading";
+        fileBuffer = await requestFileDownload(fileInfo.id, dataKey.key, true);
+        return fileBuffer.byteLength;
+      },
+      () => requestFileUpload(state, fileInfo.id, fileBuffer!, dataKey.key, dataKey.version),
+    );
+  } catch (e) {
+    state.status = "error";
+    throw e;
+  }
+};

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

@@ -3,7 +3,6 @@
     queued: "대기 중",
     "generation-pending": "준비 중",
     generating: "생성하는 중",
-    "upload-pending": "업로드를 기다리는 중",
     uploading: "업로드하는 중",
     error: "실패",
   } as const;

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

@@ -1,17 +1,15 @@
 import { limitFunction } from "p-limit";
 import { SvelteMap } from "svelte/reactivity";
-import { encryptData } from "$lib/modules/crypto";
 import { storeFileThumbnailCache } from "$lib/modules/file";
 import type { FileInfo } from "$lib/modules/filesystem";
-import { Scheduler } from "$lib/modules/scheduler";
-import { generateThumbnail as doGenerateThumbnail } from "$lib/modules/thumbnail";
+import { generateThumbnail } from "$lib/modules/thumbnail";
 import { requestFileDownload, requestFileThumbnailUpload } from "$lib/services/file";
+import { Scheduler } from "$lib/utils";
 
 export type GenerationStatus =
   | "queued"
   | "generation-pending"
   | "generating"
-  | "upload-pending"
   | "uploading"
   | "uploaded"
   | "error";
@@ -31,33 +29,27 @@ export const clearThumbnailGenerationStatuses = () => {
   }
 };
 
-const generateThumbnail = limitFunction(
-  async (fileId: number, fileBuffer: ArrayBuffer, fileType: string, dataKey: CryptoKey) => {
-    statuses.set(fileId, "generating");
-
-    const thumbnail = await doGenerateThumbnail(fileBuffer, fileType);
-    if (!thumbnail) return null;
-
-    const thumbnailBuffer = await thumbnail.arrayBuffer();
-    const thumbnailEncrypted = await encryptData(thumbnailBuffer, dataKey);
-    statuses.set(fileId, "upload-pending");
-    return { plaintext: thumbnailBuffer, ...thumbnailEncrypted };
-  },
-  { concurrency: 4 },
-);
-
 const requestThumbnailUpload = limitFunction(
-  async (
-    fileId: number,
-    dataKeyVersion: Date,
-    thumbnail: { plaintext: ArrayBuffer; ciphertext: ArrayBuffer; iv: ArrayBuffer },
-  ) => {
-    statuses.set(fileId, "uploading");
+  async (fileInfo: FileInfo, fileBuffer: ArrayBuffer) => {
+    statuses.set(fileInfo.id, "generating");
 
-    const res = await requestFileThumbnailUpload(fileId, dataKeyVersion, thumbnail);
-    if (!res.ok) return false;
-    statuses.set(fileId, "uploaded");
-    storeFileThumbnailCache(fileId, thumbnail.plaintext); // Intended
+    const thumbnail = await generateThumbnail(
+      new Blob([fileBuffer], { type: fileInfo.contentType }),
+    );
+    if (!thumbnail) return false;
+
+    statuses.set(fileInfo.id, "uploading");
+
+    const res = await requestFileThumbnailUpload(
+      fileInfo.id,
+      thumbnail,
+      fileInfo.dataKey?.key!,
+      fileInfo.dataKey?.version!,
+    );
+    if (!res) return false;
+
+    statuses.set(fileInfo.id, "uploaded");
+    void thumbnail.arrayBuffer().then((buffer) => storeFileThumbnailCache(fileInfo.id, buffer));
     return true;
   },
   { concurrency: 4 },
@@ -81,16 +73,7 @@ export const requestThumbnailGeneration = async (fileInfo: FileInfo) => {
         return file.byteLength;
       },
       async () => {
-        const thumbnail = await generateThumbnail(
-          fileInfo.id,
-          file!,
-          fileInfo.contentType,
-          fileInfo.dataKey?.key!,
-        );
-        if (
-          !thumbnail ||
-          !(await requestThumbnailUpload(fileInfo.id, fileInfo.dataKey?.version!, thumbnail))
-        ) {
+        if (!(await requestThumbnailUpload(fileInfo, file!))) {
           statuses.set(fileInfo.id, "error");
         }
       },

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

@@ -51,7 +51,7 @@
     if (!files || files.length === 0) return;
 
     for (const file of files) {
-      requestFileUpload(file, data.id, $hmacSecretStore?.get(1)!, $masterKeyStore?.get(1)!, () => {
+      requestFileUpload(file, data.id, $masterKeyStore?.get(1)!, $hmacSecretStore?.get(1)!, () => {
         return new Promise((resolve) => {
           duplicatedFile = file;
           resolveForDuplicateFileModal = resolve;

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

@@ -81,11 +81,11 @@ export const requestDirectoryCreation = async (
 export const requestFileUpload = async (
   file: File,
   parentId: "root" | number,
-  hmacSecret: HmacSecret,
   masterKey: MasterKey,
+  hmacSecret: HmacSecret,
   onDuplicate: () => Promise<boolean>,
 ) => {
-  const res = await uploadFile(file, parentId, hmacSecret, masterKey, onDuplicate);
+  const res = await uploadFile(file, parentId, masterKey, hmacSecret, onDuplicate);
   if (!res) return false;
 
   if (res.fileBuffer) {

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

@@ -5,6 +5,7 @@
 
   import IconStorage from "~icons/material-symbols/storage";
   import IconImage from "~icons/material-symbols/image";
+  import IconLockReset from "~icons/material-symbols/lock-reset";
   import IconPassword from "~icons/material-symbols/password";
   import IconLogout from "~icons/material-symbols/logout";
 
@@ -41,6 +42,13 @@
     >
       썸네일
     </MenuEntryButton>
+    <MenuEntryButton
+      onclick={() => goto("/settings/migration")}
+      icon={IconLockReset}
+      iconColor="text-teal-500"
+    >
+      암호화 마이그레이션
+    </MenuEntryButton>
   </div>
   <div class="space-y-2">
     <p class="font-semibold">보안</p>

src/routes/api/upload/[id]/chunks/[index]/+server.ts

@@ -1,6 +1,6 @@
 import { error, text } from "@sveltejs/kit";
 import { Readable } from "stream";
-import { ReadableStream } from "stream/web";
+import type { ReadableStream } from "stream/web";
 import { z } from "zod";
 import { parseContentDigestHeader } from "$lib/modules/http";
 import { authorize } from "$lib/server/modules/auth";
@@ -13,7 +13,7 @@ export const POST: RequestHandler = async ({ locals, params, request }) => {
   const zodRes = z
     .object({
       id: z.uuidv4(),
-      index: z.coerce.number().int().nonnegative(),
+      index: z.coerce.number().int().positive(),
     })
     .safeParse(params);
   if (!zodRes.success) error(400, "Invalid path parameters");

src/service-worker/constants.ts

@@ -0,0 +1 @@
+export * from "../lib/constants";

src/service-worker/handlers/decryptFile.ts

@@ -1,4 +1,4 @@
-import { DECRYPTED_FILE_URL_PREFIX, CHUNK_SIZE, ENCRYPTED_CHUNK_SIZE } from "../modules/constants";
+import { DECRYPTED_FILE_URL_PREFIX, CHUNK_SIZE, ENCRYPTED_CHUNK_SIZE } from "../constants";
 import { decryptChunk, getEncryptedRange, getDecryptedSize } from "../modules/crypto";
 import { parseRangeHeader, getContentRangeHeader } from "../modules/http";
 import { getFile } from "../modules/opfs";
@@ -15,10 +15,13 @@ const createResponse = (
   const headers: Record<string, string> = {
     "Accept-Ranges": "bytes",
     "Content-Length": String(range.end - range.start + 1),
-    "Content-Type": contentType ?? "application/octet-stream",
     ...(isRangeRequest ? getContentRangeHeader(range) : {}),
   };
 
+  if (contentType) {
+    headers["Content-Type"] = contentType;
+  }
+
   if (downloadFilename) {
     headers["Content-Disposition"] =
       `attachment; filename*=UTF-8''${encodeURIComponent(downloadFilename)}`;

src/service-worker/index.ts

@@ -3,7 +3,7 @@
 /// <reference lib="webworker" />
 /// <reference types="@sveltejs/kit" />
 
-import { DECRYPTED_FILE_URL_PREFIX } from "./modules/constants";
+import { DECRYPTED_FILE_URL_PREFIX } from "./constants";
 import { decryptFile } from "./handlers";
 import { fileMetadataStore } from "./stores";
 import type { ServiceWorkerMessage, ServiceWorkerResponse } from "./types";

src/service-worker/modules/constants.ts

@@ -1 +0,0 @@
-export * from "../../lib/constants";

src/service-worker/modules/crypto.ts

@@ -1,4 +1,4 @@
-import { ENCRYPTION_OVERHEAD, CHUNK_SIZE, ENCRYPTED_CHUNK_SIZE } from "./constants";
+import { ENCRYPTION_OVERHEAD, CHUNK_SIZE, ENCRYPTED_CHUNK_SIZE } from "../constants";
 
 export * from "../../lib/modules/crypto";
 

src/trpc/routers/file.ts

@@ -100,6 +100,10 @@ const fileRouter = router({
     return await MediaRepo.getMissingFileThumbnails(ctx.session.userId);
   }),
 
+  listLegacy: roleProcedure["activeClient"].query(async ({ ctx }) => {
+    return await FileRepo.getLegacyFileIds(ctx.session.userId);
+  }),
+
   rename: roleProcedure["activeClient"]
     .input(
       z.object({

src/trpc/routers/upload.ts

@@ -1,7 +1,7 @@
 import { TRPCError } from "@trpc/server";
 import { createHash } from "crypto";
 import { createReadStream, createWriteStream } from "fs";
-import { mkdir, rename } from "fs/promises";
+import { copyFile, mkdir } from "fs/promises";
 import mime from "mime";
 import { dirname } from "path";
 import { v4 as uuidv4 } from "uuid";
@@ -13,6 +13,8 @@ import env from "$lib/server/loadenv";
 import { safeRecursiveRm, safeUnlink } from "$lib/server/modules/filesystem";
 import { router, roleProcedure } from "../init.server";
 
+const UPLOADS_EXPIRES = 24 * 3600 * 1000; // 24 hours
+
 const sessionLocks = new Set<string>();
 
 const generateSessionId = async () => {
@@ -60,7 +62,7 @@ const uploadRouter = router({
           userId: ctx.session.userId,
           path,
           totalChunks: input.chunks,
-          expiresAt: new Date(Date.now() + 24 * 60 * 60 * 1000), // 24 hours
+          expiresAt: new Date(Date.now() + UPLOADS_EXPIRES),
           parentId: input.parent,
           mekVersion: input.mekVersion,
           encDek: input.dek,
@@ -89,41 +91,6 @@ const uploadRouter = router({
       }
     }),
 
-  startFileThumbnailUpload: roleProcedure["activeClient"]
-    .input(
-      z.object({
-        file: z.int().positive(),
-        dekVersion: z.date(),
-      }),
-    )
-    .mutation(async ({ ctx, input }) => {
-      const { id, path } = await generateSessionId();
-
-      try {
-        await UploadRepo.createThumbnailUploadSession({
-          id,
-          userId: ctx.session.userId,
-          path,
-          totalChunks: 1, // Up to 4 MiB
-          expiresAt: new Date(Date.now() + 24 * 60 * 60 * 1000), // 24 hours
-          fileId: input.file,
-          dekVersion: input.dekVersion,
-        });
-        return { uploadId: id };
-      } catch (e) {
-        await safeRecursiveRm(path);
-
-        if (e instanceof IntegrityError) {
-          if (e.message === "File not found") {
-            throw new TRPCError({ code: "NOT_FOUND", message: "File not found" });
-          } else if (e.message === "Invalid DEK version") {
-            throw new TRPCError({ code: "BAD_REQUEST", message: "Mismatched DEK version" });
-          }
-        }
-        throw e;
-      }
-    }),
-
   completeFileUpload: roleProcedure["activeClient"]
     .input(
       z.object({
@@ -143,14 +110,14 @@ const uploadRouter = router({
 
       try {
         const session = await UploadRepo.getUploadSession(uploadId, ctx.session.userId);
-        if (!session || session.type !== "file") {
+        if (session?.type !== "file") {
           throw new TRPCError({ code: "NOT_FOUND", message: "Invalid upload id" });
         } else if (
           (session.hskVersion && !input.contentHmac) ||
           (!session.hskVersion && input.contentHmac)
         ) {
           throw new TRPCError({ code: "BAD_REQUEST", message: "Invalid content HMAC" });
-        } else if (session.uploadedChunks.length < session.totalChunks) {
+        } else if (session.uploadedChunks < session.totalChunks) {
           throw new TRPCError({ code: "BAD_REQUEST", message: "Upload not completed" });
         }
 
@@ -160,7 +127,7 @@ const uploadRouter = router({
         const hashStream = createHash("sha256");
         const writeStream = createWriteStream(filePath, { flags: "wx", mode: 0o600 });
 
-        for (let i = 0; i < session.totalChunks; i++) {
+        for (let i = 1; i <= session.totalChunks; i++) {
           for await (const chunk of createReadStream(`${session.path}/${i}`)) {
             hashStream.update(chunk);
             writeStream.write(chunk);
@@ -195,6 +162,42 @@ const uploadRouter = router({
       }
     }),
 
+  startFileThumbnailUpload: roleProcedure["activeClient"]
+    .input(
+      z.object({
+        file: z.int().positive(),
+        dekVersion: z.date(),
+      }),
+    )
+    .mutation(async ({ ctx, input }) => {
+      const { id, path } = await generateSessionId();
+
+      try {
+        await UploadRepo.createThumbnailOrMigrationUploadSession({
+          id,
+          type: "thumbnail",
+          userId: ctx.session.userId,
+          path,
+          totalChunks: 1, // Up to 4 MiB
+          expiresAt: new Date(Date.now() + UPLOADS_EXPIRES),
+          fileId: input.file,
+          dekVersion: input.dekVersion,
+        });
+        return { uploadId: id };
+      } catch (e) {
+        await safeRecursiveRm(path);
+
+        if (e instanceof IntegrityError) {
+          if (e.message === "File not found") {
+            throw new TRPCError({ code: "NOT_FOUND", message: "Invalid file id" });
+          } else if (e.message === "Invalid DEK version") {
+            throw new TRPCError({ code: "BAD_REQUEST", message: e.message });
+          }
+        }
+        throw e;
+      }
+    }),
+
   completeFileThumbnailUpload: roleProcedure["activeClient"]
     .input(
       z.object({
@@ -213,15 +216,15 @@ const uploadRouter = router({
 
       try {
         const session = await UploadRepo.getUploadSession(uploadId, ctx.session.userId);
-        if (!session || session.type !== "thumbnail") {
+        if (session?.type !== "thumbnail") {
           throw new TRPCError({ code: "NOT_FOUND", message: "Invalid upload id" });
-        } else if (session.uploadedChunks.length < session.totalChunks) {
+        } else if (session.uploadedChunks < session.totalChunks) {
           throw new TRPCError({ code: "BAD_REQUEST", message: "Upload not completed" });
         }
 
         thumbnailPath = `${env.thumbnailsPath}/${ctx.session.userId}/${uploadId}`;
         await mkdir(dirname(thumbnailPath), { recursive: true });
-        await rename(`${session.path}/0`, thumbnailPath);
+        await copyFile(`${session.path}/1`, thumbnailPath);
 
         const oldThumbnailPath = await db.transaction().execute(async (trx) => {
           const oldPath = await MediaRepo.updateFileThumbnail(
@@ -238,14 +241,118 @@ const uploadRouter = router({
         await Promise.all([safeUnlink(oldThumbnailPath), safeRecursiveRm(session.path)]);
       } catch (e) {
         await safeUnlink(thumbnailPath);
+
+        if (e instanceof IntegrityError && e.message === "Invalid DEK version") {
+          // DEK rotated after this upload started
+          throw new TRPCError({ code: "CONFLICT", message: e.message });
+        }
+        throw e;
+      } finally {
+        sessionLocks.delete(uploadId);
+      }
+    }),
+
+  startMigrationUpload: roleProcedure["activeClient"]
+    .input(
+      z.object({
+        file: z.int().positive(),
+        chunks: z.int().positive(),
+        dekVersion: z.date(),
+      }),
+    )
+    .mutation(async ({ ctx, input }) => {
+      const { id, path } = await generateSessionId();
+
+      try {
+        await UploadRepo.createThumbnailOrMigrationUploadSession({
+          id,
+          type: "migration",
+          userId: ctx.session.userId,
+          path,
+          totalChunks: input.chunks,
+          expiresAt: new Date(Date.now() + UPLOADS_EXPIRES),
+          fileId: input.file,
+          dekVersion: input.dekVersion,
+        });
+        return { uploadId: id };
+      } catch (e) {
+        await safeRecursiveRm(path);
+
         if (e instanceof IntegrityError) {
           if (e.message === "File not found") {
-            throw new TRPCError({ code: "NOT_FOUND", message: "File not found" });
-          } else if (e.message === "Invalid DEK version") {
-            throw new TRPCError({ code: "BAD_REQUEST", message: "Mismatched DEK version" });
+            throw new TRPCError({ code: "NOT_FOUND", message: "Invalid file id" });
+          } else if (e.message === "File is not legacy") {
+            throw new TRPCError({ code: "BAD_REQUEST", message: e.message });
           }
         }
         throw e;
+      }
+    }),
+
+  completeMigrationUpload: roleProcedure["activeClient"]
+    .input(
+      z.object({
+        uploadId: z.uuidv4(),
+      }),
+    )
+    .mutation(async ({ ctx, input }) => {
+      const { uploadId } = input;
+      if (sessionLocks.has(uploadId)) {
+        throw new TRPCError({ code: "CONFLICT", message: "Completion already in progress" });
+      } else {
+        sessionLocks.add(uploadId);
+      }
+
+      let filePath = "";
+
+      try {
+        const session = await UploadRepo.getUploadSession(uploadId, ctx.session.userId);
+        if (session?.type !== "migration") {
+          throw new TRPCError({ code: "NOT_FOUND", message: "Invalid upload id" });
+        } else if (session.uploadedChunks < session.totalChunks) {
+          throw new TRPCError({ code: "BAD_REQUEST", message: "Upload not completed" });
+        }
+
+        filePath = `${env.libraryPath}/${ctx.session.userId}/${uuidv4()}`;
+        await mkdir(dirname(filePath), { recursive: true });
+
+        const hashStream = createHash("sha256");
+        const writeStream = createWriteStream(filePath, { flags: "wx", mode: 0o600 });
+
+        for (let i = 1; i <= session.totalChunks; i++) {
+          for await (const chunk of createReadStream(`${session.path}/${i}`)) {
+            hashStream.update(chunk);
+            writeStream.write(chunk);
+          }
+        }
+
+        await new Promise<void>((resolve, reject) => {
+          writeStream.end((e: any) => (e ? reject(e) : resolve()));
+        });
+
+        const hash = hashStream.digest("base64");
+        const oldPath = await db.transaction().execute(async (trx) => {
+          const { oldPath } = await FileRepo.migrateFileContent(
+            trx,
+            ctx.session.userId,
+            session.fileId,
+            filePath,
+            session.dekVersion!,
+            hash,
+          );
+          await UploadRepo.deleteUploadSession(trx, uploadId);
+          return oldPath;
+        });
+
+        await Promise.all([safeUnlink(oldPath), safeRecursiveRm(session.path)]);
+      } catch (e) {
+        await safeUnlink(filePath);
+
+        if (e instanceof IntegrityError && e.message === "File is not legacy") {
+          // File migrated after this upload started
+          throw new TRPCError({ code: "CONFLICT", message: e.message });
+        }
+        throw e;
       } finally {
         sessionLocks.delete(uploadId);
       }

src/workers/hmac.ts

@@ -0,0 +1,25 @@
+import { hmac } from "@noble/hashes/hmac.js";
+import { sha256 } from "@noble/hashes/sha2.js";
+
+export interface ComputeMessage {
+  stream: ReadableStream;
+  key: Uint8Array;
+}
+
+export interface ResultMessage {
+  result: Uint8Array;
+}
+
+self.onmessage = async (event: MessageEvent<ComputeMessage>) => {
+  const h = hmac.create(sha256, event.data.key);
+  const reader = event.data.stream.getReader();
+
+  while (true) {
+    const { done, value } = await reader.read();
+    if (done) break;
+    h.update(value);
+  }
+
+  const result = h.digest();
+  self.postMessage({ result } satisfies ResultMessage, { transfer: [result.buffer] });
+};

svelte.config.js

@@ -8,6 +8,7 @@ const config = {
     adapter: adapter(),
     alias: {
       $trpc: "./src/trpc",
+      $workers: "./src/workers",
     },
   },
 };