feat: 實作全域檔案傳輸機制與 .tar 封裝規範

## 主要變更 ### 新增全域檔案傳輸模組 (src/transfer/) - constants.ts: 定義傳輸常數（10MB 門檻、5MB chunk 大小） - types.ts: 傳輸類型定義 - uploadManager.ts: 後端上傳管理器（支援直傳與 chunk） - downloadManager.ts: 後端下載管理器（支援直傳與 chunk） - archiveManager.ts: 封裝管理器（僅允許 .tar） - index.ts: 統一匯出 ### 新增 API 端點 - uploadChunk.tsx: Chunk 上傳 API - downloadChunk.tsx: Chunk 下載 API ### 前端更新 - public/script.js: 整合智慧傳輸策略（≤10MB 直傳，>10MB chunk） - public/transfer.js: 前端傳輸管理模組 ### 轉換器更新 - mineru.ts: 改用 .tar 格式（不壓縮），禁止 .tar.gz - download.tsx: 使用統一的封裝管理器 ### 測試 - tests/transfer/: 完整傳輸機制測試套件 - tests/converters/mineru.test.ts: 更新以符合 .tar 規範 ### 文件 - README.md: 新增檔案傳輸機制說明 ## 設計原則 - 檔案 ≤10MB：直接傳輸 - 檔案 >10MB：使用 5MB chunks 分段傳輸 - 多檔輸出：僅允許 .tar 封裝（禁止 .tar.gz/.zip） - 引擎層不感知 chunk（僅傳輸層處理）
2026-01-21 13:58:01 +08:00 · 2026-01-21 13:58:01 +08:00 · 5322f85721
commit 5322f85721
parent f7ebc084ea
18 changed files with 2387 additions and 61 deletions
--- a/README.md
+++ b/README.md
@ -157,15 +157,15 @@ docker compose up -d

 ## 支援格式

-| 轉換器      | 用途   | 格式數 |
-| ----------- | ------ | ------ |
-| FFmpeg      | 影音   | 400+   |
-| ImageMagick | 圖片   | 200+   |
-| LibreOffice | 文件   | 60+    |
-| Pandoc      | 文件   | 100+   |
-| Calibre     | 電子書 | 40+    |
-| Inkscape    | 向量圖 | 20+    |
-| MinerU      | 文件→MD | 2     |
+| 轉換器      | 用途    | 格式數 |
+| ----------- | ------- | ------ |
+| FFmpeg      | 影音    | 400+   |
+| ImageMagick | 圖片    | 200+   |
+| LibreOffice | 文件    | 60+    |
+| Pandoc      | 文件    | 100+   |
+| Calibre     | 電子書  | 40+    |
+| Inkscape    | 向量圖  | 20+    |
+| MinerU      | 文件→MD | 2      |

 完整列表 → [docs/converters.md](docs/converters.md)

@ -175,10 +175,32 @@ docker compose up -d

 ConvertX 內建文件轉換引擎。

- md-t
- md-i
+- md-t（表格以 Markdown 呈現）
+- md-i（表格以圖片呈現）

-輸出格式：tar.gz
+輸出格式：.tar（不壓縮封裝）
+
+---
+
+## 檔案傳輸機制
+
+Contents.CN 使用統一的檔案傳輸策略：
+
+| 檔案大小 | 傳輸方式 | 說明 |
+| -------- | -------- | ---- |
+| ≤ 10MB | 直接傳輸 | 單一請求完成上傳/下載 |
+| > 10MB | 分段傳輸 | 使用 5MB chunks 分段傳輸 |
+
+### 多檔輸出封裝
+
+- ✅ 唯一允許格式：`.tar`
+- ❌ 禁止使用：`.tar.gz`、`.tgz`、`.zip`
+
+### 設計原則
+
+- 分段傳輸僅存在於傳輸層
+- 轉換引擎只接收完整檔案
+- 前後端使用共用傳輸模組

 ---

--- a/public/script.js
+++ b/public/script.js
@ -242,11 +242,54 @@ const deleteRow = (target) => {
  }).catch((err) => console.log(err));
 };

+// ==================== 全域傳輸常數 ====================
+const CHUNK_THRESHOLD_BYTES = 10 * 1024 * 1024; // 10MB
+const CHUNK_SIZE_BYTES = 5 * 1024 * 1024; // 5MB
+
+/**
+ * 判斷是否需要使用 chunk 傳輸
+ */
+function shouldUseChunkedUpload(fileSize) {
+  return fileSize > CHUNK_THRESHOLD_BYTES;
+}
+
+/**
+ * 生成 UUID
+ */
+function generateUploadId() {
+  if (typeof crypto !== "undefined" && crypto.randomUUID) {
+    return crypto.randomUUID();
+  }
+  return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, function(c) {
+    const r = Math.random() * 16 | 0;
+    const v = c === "x" ? r : (r & 0x3 | 0x8);
+    return v.toString(16);
+  });
+}
+
+/**
+ * 統一上傳檔案（自動判斷使用直傳或 chunk）
+ * 
+ * @param {File} file - 要上傳的檔案
+ */
 const uploadFile = (file) => {
  convertButton.disabled = true;
  convertButton.value = getTranslation("convert", "uploading");
  pendingFiles += 1;

+  if (shouldUseChunkedUpload(file.size)) {
+    // 大檔：使用 chunk 上傳
+    uploadFileChunked(file);
+  } else {
+    // 小檔：直接上傳
+    uploadFileDirect(file);
+  }
+};
+
+/**
+ * 直接上傳（≤10MB）
+ */
+const uploadFileDirect = (file) => {
  const formData = new FormData();
  formData.append("file", file, file.name);

@ -255,7 +298,12 @@ const uploadFile = (file) => {
  xhr.open("POST", `${webroot}/upload`, true);

  xhr.onload = () => {
-    let data = JSON.parse(xhr.responseText);
+    let data = {};
+    try {
+      data = JSON.parse(xhr.responseText);
+    } catch (e) {
+      console.log("Parse error:", e);
+    }

    pendingFiles -= 1;
    if (pendingFiles === 0) {
@ -265,10 +313,12 @@ const uploadFile = (file) => {
      convertButton.value = getTranslation("convert", "convertButton");
    }

-    //Remove the progress bar when upload is done
+    // Remove the progress bar when upload is done
    let progressbar = file.htmlRow.getElementsByTagName("progress");
-    progressbar[0].parentElement.remove();
-    console.log(data);
+    if (progressbar[0]) {
+      progressbar[0].parentElement.remove();
+    }
+    console.log("Direct upload complete:", data);
  };

  xhr.upload.onprogress = (e) => {
@ -277,16 +327,88 @@ const uploadFile = (file) => {
    console.log(`upload progress (${file.name}):`, (100 * sent) / total);

    let progressbar = file.htmlRow.getElementsByTagName("progress");
-    progressbar[0].value = (100 * sent) / total;
+    if (progressbar[0]) {
+      progressbar[0].value = (100 * sent) / total;
+    }
  };

  xhr.onerror = (e) => {
-    console.log(e);
+    console.log("Upload error:", e);
+    pendingFiles -= 1;
+    if (pendingFiles === 0) {
+      convertButton.value = getTranslation("convert", "convertButton");
+    }
  };

  xhr.send(formData);
 };

+/**
+ * Chunk 上傳（>10MB）
+ */
+const uploadFileChunked = async (file) => {
+  const uploadId = generateUploadId();
+  const totalChunks = Math.ceil(file.size / CHUNK_SIZE_BYTES);
+  
+  console.log(`Starting chunked upload: ${file.name}, size: ${file.size}, chunks: ${totalChunks}`);
+
+  try {
+    for (let chunkIndex = 0; chunkIndex < totalChunks; chunkIndex++) {
+      const start = chunkIndex * CHUNK_SIZE_BYTES;
+      const end = Math.min(start + CHUNK_SIZE_BYTES, file.size);
+      const chunk = file.slice(start, end);
+
+      const formData = new FormData();
+      formData.append("upload_id", uploadId);
+      formData.append("chunk_index", chunkIndex.toString());
+      formData.append("total_chunks", totalChunks.toString());
+      formData.append("file_name", file.name);
+      formData.append("total_size", file.size.toString());
+      formData.append("chunk", chunk);
+
+      const response = await fetch(`${webroot}/upload-chunk`, {
+        method: "POST",
+        body: formData,
+      });
+
+      if (!response.ok) {
+        throw new Error(`Chunk ${chunkIndex} upload failed: ${response.status}`);
+      }
+
+      // 更新進度
+      const percent = ((chunkIndex + 1) / totalChunks) * 100;
+      let progressbar = file.htmlRow.getElementsByTagName("progress");
+      if (progressbar[0]) {
+        progressbar[0].value = percent;
+      }
+      console.log(`Chunk ${chunkIndex + 1}/${totalChunks} uploaded (${percent.toFixed(1)}%)`);
+    }
+
+    // 完成
+    pendingFiles -= 1;
+    if (pendingFiles === 0) {
+      if (formatSelected) {
+        convertButton.disabled = false;
+      }
+      convertButton.value = getTranslation("convert", "convertButton");
+    }
+
+    // Remove the progress bar
+    let progressbar = file.htmlRow.getElementsByTagName("progress");
+    if (progressbar[0]) {
+      progressbar[0].parentElement.remove();
+    }
+    console.log("Chunked upload complete:", file.name);
+
+  } catch (error) {
+    console.error("Chunked upload failed:", error);
+    pendingFiles -= 1;
+    if (pendingFiles === 0) {
+      convertButton.value = getTranslation("convert", "convertButton");
+    }
+  }
+};
+
 const formConvert = document.querySelector(`form[action='${webroot}/convert']`);

 formConvert.addEventListener("submit", () => {
--- a/public/transfer.js
+++ b/public/transfer.js
@ -0,0 +1,388 @@
+/**
+ * Contents.CN 前端檔案傳輸管理器
+ * 
+ * 統一處理所有檔案的上傳與下載：
+ * - 檔案 ≤ 10MB：直接傳輸
+ * - 檔案 > 10MB：使用 chunk 分段傳輸
+ * 
+ * ⚠️ 重要：所有功能必須使用此模組，不得自行實作傳輸邏輯
+ */
+
+// ==================== 常數定義 ====================
+
+/**
+ * 檔案大小門檻（10MB）
+ */
+const CHUNK_THRESHOLD_BYTES = 10 * 1024 * 1024;
+
+/**
+ * 每個 chunk 的大小（5MB）
+ */
+const CHUNK_SIZE_BYTES = 5 * 1024 * 1024;
+
+// ==================== 工具函數 ====================
+
+/**
+ * 生成 UUID（用於 upload_id）
+ */
+function generateUploadId() {
+  if (typeof crypto !== "undefined" && crypto.randomUUID) {
+    return crypto.randomUUID();
+  }
+  // 降級方案
+  return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, function(c) {
+    const r = Math.random() * 16 | 0;
+    const v = c === "x" ? r : (r & 0x3 | 0x8);
+    return v.toString(16);
+  });
+}
+
+/**
+ * 判斷是否需要使用 chunk 傳輸
+ */
+function shouldUseChunkedTransfer(fileSize) {
+  return fileSize > CHUNK_THRESHOLD_BYTES;
+}
+
+/**
+ * 計算 chunk 數量
+ */
+function calculateChunkCount(fileSize) {
+  return Math.ceil(fileSize / CHUNK_SIZE_BYTES);
+}
+
+// ==================== 上傳管理器 ====================
+
+/**
+ * 上傳管理器類別
+ */
+class UploadManager {
+  /**
+   * @param {string} webroot - 網站根路徑
+   */
+  constructor(webroot) {
+    this.webroot = webroot;
+    this.activeUploads = new Map();
+  }
+
+  /**
+   * 上傳檔案（自動判斷使用直傳或 chunk）
+   * 
+   * @param {File} file - 要上傳的檔案
+   * @param {object} options - 選項
+   * @param {function} options.onProgress - 進度回調 (percent: number) => void
+   * @param {function} options.onComplete - 完成回調 (response: object) => void
+   * @param {function} options.onError - 錯誤回調 (error: Error) => void
+   * @returns {Promise<object>} 上傳結果
+   */
+  async uploadFile(file, options = {}) {
+    const { onProgress, onComplete, onError } = options;
+
+    try {
+      let result;
+      
+      if (shouldUseChunkedTransfer(file.size)) {
+        // 大檔：使用 chunk 上傳
+        result = await this.uploadChunked(file, onProgress);
+      } else {
+        // 小檔：直接上傳
+        result = await this.uploadDirect(file, onProgress);
+      }
+
+      if (onComplete) onComplete(result);
+      return result;
+    } catch (error) {
+      if (onError) onError(error);
+      throw error;
+    }
+  }
+
+  /**
+   * 直接上傳（小檔）
+   */
+  async uploadDirect(file, onProgress) {
+    return new Promise((resolve, reject) => {
+      const formData = new FormData();
+      formData.append("file", file, file.name);
+
+      const xhr = new XMLHttpRequest();
+      xhr.open("POST", `${this.webroot}/upload`, true);
+
+      xhr.upload.onprogress = (e) => {
+        if (e.lengthComputable && onProgress) {
+          const percent = (e.loaded / e.total) * 100;
+          onProgress(percent);
+        }
+      };
+
+      xhr.onload = () => {
+        if (xhr.status >= 200 && xhr.status < 300) {
+          try {
+            const data = JSON.parse(xhr.responseText);
+            resolve(data);
+          } catch {
+            resolve({ success: true, message: "Upload completed" });
+          }
+        } else {
+          reject(new Error(`Upload failed with status ${xhr.status}`));
+        }
+      };
+
+      xhr.onerror = () => reject(new Error("Upload failed"));
+      xhr.send(formData);
+    });
+  }
+
+  /**
+   * Chunk 上傳（大檔）
+   */
+  async uploadChunked(file, onProgress) {
+    const uploadId = generateUploadId();
+    const totalChunks = calculateChunkCount(file.size);
+    
+    this.activeUploads.set(uploadId, {
+      file,
+      totalChunks,
+      uploadedChunks: 0,
+      status: "uploading"
+    });
+
+    try {
+      for (let chunkIndex = 0; chunkIndex < totalChunks; chunkIndex++) {
+        const start = chunkIndex * CHUNK_SIZE_BYTES;
+        const end = Math.min(start + CHUNK_SIZE_BYTES, file.size);
+        const chunk = file.slice(start, end);
+
+        await this.uploadChunk(uploadId, chunkIndex, totalChunks, chunk, file.name, file.size);
+
+        // 更新進度
+        const uploadInfo = this.activeUploads.get(uploadId);
+        if (uploadInfo) {
+          uploadInfo.uploadedChunks = chunkIndex + 1;
+          const percent = ((chunkIndex + 1) / totalChunks) * 100;
+          if (onProgress) onProgress(percent);
+        }
+      }
+
+      this.activeUploads.delete(uploadId);
+      return { success: true, message: "Chunked upload completed", upload_id: uploadId };
+    } catch (error) {
+      this.activeUploads.delete(uploadId);
+      throw error;
+    }
+  }
+
+  /**
+   * 上傳單個 chunk
+   */
+  async uploadChunk(uploadId, chunkIndex, totalChunks, chunkData, fileName, totalSize) {
+    const formData = new FormData();
+    formData.append("upload_id", uploadId);
+    formData.append("chunk_index", chunkIndex.toString());
+    formData.append("total_chunks", totalChunks.toString());
+    formData.append("file_name", fileName);
+    formData.append("total_size", totalSize.toString());
+    formData.append("chunk", chunkData);
+
+    const response = await fetch(`${this.webroot}/upload-chunk`, {
+      method: "POST",
+      body: formData,
+    });
+
+    if (!response.ok) {
+      throw new Error(`Chunk ${chunkIndex} upload failed: ${response.status}`);
+    }
+
+    return response.json();
+  }
+
+  /**
+   * 取消上傳
+   */
+  cancelUpload(uploadId) {
+    const upload = this.activeUploads.get(uploadId);
+    if (upload) {
+      upload.status = "cancelled";
+      this.activeUploads.delete(uploadId);
+    }
+  }
+}
+
+// ==================== 下載管理器 ====================
+
+/**
+ * 下載管理器類別
+ */
+class DownloadManager {
+  /**
+   * @param {string} webroot - 網站根路徑
+   */
+  constructor(webroot) {
+    this.webroot = webroot;
+  }
+
+  /**
+   * 下載檔案（自動判斷使用直傳或 chunk）
+   * 
+   * @param {string} url - 下載 URL
+   * @param {string} fileName - 檔案名稱
+   * @param {object} options - 選項
+   * @param {function} options.onProgress - 進度回調
+   * @returns {Promise<Blob>} 下載的檔案
+   */
+  async downloadFile(url, fileName, options = {}) {
+    const { onProgress } = options;
+
+    // 先取得檔案資訊
+    const info = await this.getFileInfo(url);
+    
+    if (!info) {
+      // 無法取得資訊，使用直接下載
+      return this.downloadDirect(url, fileName);
+    }
+
+    if (shouldUseChunkedTransfer(info.total_size)) {
+      // 大檔：使用 chunk 下載
+      return this.downloadChunked(url, fileName, info, onProgress);
+    } else {
+      // 小檔：直接下載
+      return this.downloadDirect(url, fileName, onProgress);
+    }
+  }
+
+  /**
+   * 取得檔案資訊
+   */
+  async getFileInfo(url) {
+    try {
+      const response = await fetch(`${url}/info`, { method: "GET" });
+      if (response.ok) {
+        return response.json();
+      }
+    } catch {
+      // 忽略錯誤，降級為直接下載
+    }
+    return null;
+  }
+
+  /**
+   * 直接下載（小檔）
+   */
+  async downloadDirect(url, fileName, onProgress) {
+    const response = await fetch(url);
+    
+    if (!response.ok) {
+      throw new Error(`Download failed: ${response.status}`);
+    }
+
+    const contentLength = response.headers.get("Content-Length");
+    const total = contentLength ? parseInt(contentLength, 10) : 0;
+    
+    const reader = response.body.getReader();
+    const chunks = [];
+    let loaded = 0;
+
+    while (true) {
+      const { done, value } = await reader.read();
+      if (done) break;
+      
+      chunks.push(value);
+      loaded += value.length;
+
+      if (onProgress && total > 0) {
+        onProgress((loaded / total) * 100);
+      }
+    }
+
+    const blob = new Blob(chunks);
+    this.triggerDownload(blob, fileName);
+    return blob;
+  }
+
+  /**
+   * Chunk 下載（大檔）
+   */
+  async downloadChunked(url, fileName, info, onProgress) {
+    const { total_chunks, chunk_size, total_size } = info;
+    const chunks = [];
+    
+    for (let i = 0; i < total_chunks; i++) {
+      const chunkData = await this.downloadChunk(url, i);
+      chunks.push(chunkData);
+      
+      if (onProgress) {
+        const loaded = Math.min((i + 1) * chunk_size, total_size);
+        onProgress((loaded / total_size) * 100);
+      }
+    }
+
+    const blob = new Blob(chunks);
+    this.triggerDownload(blob, fileName);
+    return blob;
+  }
+
+  /**
+   * 下載單個 chunk
+   */
+  async downloadChunk(url, chunkIndex) {
+    const response = await fetch(`${url}/chunk/${chunkIndex}`);
+    
+    if (!response.ok) {
+      throw new Error(`Chunk ${chunkIndex} download failed: ${response.status}`);
+    }
+
+    return response.arrayBuffer();
+  }
+
+  /**
+   * 觸發瀏覽器下載
+   */
+  triggerDownload(blob, fileName) {
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement("a");
+    a.href = url;
+    a.download = fileName;
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+    URL.revokeObjectURL(url);
+  }
+
+  /**
+   * 簡單下載（不使用 chunk，用於向後相容）
+   */
+  async simpleDownload(url, fileName) {
+    const a = document.createElement("a");
+    a.href = url;
+    a.download = fileName;
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+  }
+}
+
+// ==================== 全域實例 ====================
+
+// 從 meta 標籤取得 webroot
+const webrootMeta = document.querySelector("meta[name='webroot']");
+const webroot = webrootMeta ? webrootMeta.content : "";
+
+// 建立全域實例
+window.ContentsTransfer = {
+  uploadManager: new UploadManager(webroot),
+  downloadManager: new DownloadManager(webroot),
+  
+  // 工具函數
+  shouldUseChunkedTransfer,
+  calculateChunkCount,
+  
+  // 常數
+  CHUNK_THRESHOLD_BYTES,
+  CHUNK_SIZE_BYTES,
+};
+
+// 向後相容：提供簡化的 API
+window.uploadFile = (file, options) => window.ContentsTransfer.uploadManager.uploadFile(file, options);
+window.downloadFile = (url, fileName, options) => window.ContentsTransfer.downloadManager.downloadFile(url, fileName, options);
+
+console.log("Contents.CN Transfer Module initialized");
--- a/src/converters/mineru.ts
+++ b/src/converters/mineru.ts
@ -2,6 +2,7 @@ import { execFile as execFileOriginal } from "node:child_process";
 import { mkdirSync, existsSync, readdirSync, unlinkSync, rmdirSync } from "node:fs";
 import { join, basename, dirname } from "node:path";
 import { ExecFileFn } from "./types";
+import { createConverterArchive, getArchiveFileName } from "../transfer";

 export const properties = {
  from: {
@ -14,19 +15,22 @@ export const properties = {
 };

 /**
- * Helper function to create a tar.gz archive from a directory
+ * Helper function to create a .tar archive from a directory (no compression)
+ * 
+ * ⚠️ 重要：僅使用 .tar 格式，禁止 .tar.gz / .tgz / .zip
 */
-function createTarGzArchive(
+function createTarArchive(
  sourceDir: string,
-  outputTarGz: string,
+  outputTar: string,
  execFile: ExecFileFn,
 ): Promise<void> {
  return new Promise((resolve, reject) => {
-    // Use tar command to create gzipped archive
-    // tar -czf <output.tar.gz> -C <sourceDir> .
+    // Use tar command to create archive (without gzip compression)
+    // tar -cf <output.tar> -C <sourceDir> .
+    // 注意：使用 -cf 而非 -czf，避免 gzip 壓縮
    execFile(
      "tar",
-      ["-czf", outputTarGz, "-C", sourceDir, "."],
+      ["-cf", outputTar, "-C", sourceDir, "."],
      (error, stdout, stderr) => {
        if (error) {
          reject(`tar error: ${error}`);
@ -122,15 +126,14 @@ export async function convert(
        // MinerU outputs to a subdirectory, find the actual output
        const mineruActualOutput = join(mineruOutputDir, "auto");

-        // Create tar.gz archive from the output directory
-        const tarGzPath = targetPath.endsWith(".tar.gz")
-          ? targetPath
-          : `${targetPath}.tar.gz`;
+        // Create .tar archive from the output directory (不使用壓縮)
+        // 強制使用 .tar 格式，禁止 .tar.gz
+        const tarPath = getArchiveFileName(targetPath);

        // Ensure the parent directory exists
-        const tarGzDir = dirname(tarGzPath);
-        if (!existsSync(tarGzDir)) {
-          mkdirSync(tarGzDir, { recursive: true });
+        const tarDir = dirname(tarPath);
+        if (!existsSync(tarDir)) {
+          mkdirSync(tarDir, { recursive: true });
        }

        // Use the actual MinerU output directory for archiving
@ -138,14 +141,14 @@ export async function convert(
          ? mineruActualOutput
          : mineruOutputDir;

-        await createTarGzArchive(outputToArchive, tarGzPath, execFile);
+        await createTarArchive(outputToArchive, tarPath, execFile);

        // Clean up the temporary directory
        removeDir(mineruOutputDir);

        resolve("Done");
      } catch (tarError) {
-        reject(`Failed to create tar.gz archive: ${tarError}`);
+        reject(`Failed to create .tar archive: ${tarError}`);
      }
    });
  });
--- a/src/index.tsx
+++ b/src/index.tsx
@ -11,11 +11,13 @@ import { convert } from "./pages/convert";
 import { deleteFile } from "./pages/deleteFile";
 import { deleteJob } from "./pages/deleteJob";
 import { download } from "./pages/download";
+import { downloadChunk } from "./pages/downloadChunk";
 import { history } from "./pages/history";
 import { listConverters } from "./pages/listConverters";
 import { results } from "./pages/results";
 import { root } from "./pages/root";
 import { upload } from "./pages/upload";
+import { uploadChunk, uploadInfo } from "./pages/uploadChunk";
 import { user } from "./pages/user";
 import { healthcheck } from "./pages/healthcheck";

@ -41,9 +43,12 @@ const app = new Elysia({
  .use(user)
  .use(root)
  .use(upload)
+  .use(uploadChunk)
+  .use(uploadInfo)
  .use(history)
  .use(convert)
  .use(download)
+  .use(downloadChunk)
  .use(deleteJob)
  .use(results)
  .use(deleteFile)
--- a/src/pages/download.tsx
+++ b/src/pages/download.tsx
@ -1,11 +1,11 @@
 import path from "node:path";
 import { Elysia } from "elysia";
 import sanitize from "sanitize-filename";
-import * as tar from "tar";
 import { outputDir } from "..";
 import db from "../db/db";
 import { WEBROOT } from "../helpers/env";
 import { userService } from "./user";
+import { createJobArchive, shouldUseChunkedDownload } from "../transfer";

 export const download = new Elysia()
  .use(userService)
@ -45,18 +45,10 @@ export const download = new Elysia()

      const jobId = decodeURIComponent(params.jobId);
      const outputPath = `${outputDir}${userId}/${jobId}`;
-      const outputTar = path.join(outputPath, `converted_files_${jobId}.tar`);
      
-      await tar.create(
-        {
-          file: outputTar,
-          cwd: outputPath,
-          filter: (path) => {
-            return !path.match(".*\\.tar");
-          },
-        },
-        ["."],
-      );
+      // 使用統一的封裝管理器建立 .tar（不壓縮）
+      const outputTar = await createJobArchive(outputPath, jobId);
+      
      return Bun.file(outputTar);
    },
    {
--- a/src/pages/downloadChunk.tsx
+++ b/src/pages/downloadChunk.tsx
@ -0,0 +1,178 @@
+/**
+ * Contents.CN Chunk 下載 API
+ * 
+ * 處理大檔的分段下載
+ */
+
+import { Elysia, t } from "elysia";
+import { join } from "node:path";
+import { outputDir } from "..";
+import db from "../db/db";
+import { WEBROOT } from "../helpers/env";
+import { userService } from "./user";
+import sanitize from "sanitize-filename";
+import {
+  shouldUseChunkedDownload,
+  getChunkDownloadInfo,
+  getChunk,
+  createChunkDownloadHeaders,
+  getFileForDirectDownload,
+  createDirectDownloadHeaders,
+  CHUNK_SIZE_BYTES,
+} from "../transfer";
+import { statSync, existsSync } from "node:fs";
+
+export const downloadChunk = new Elysia()
+  .use(userService)
+  /**
+   * 取得檔案下載資訊
+   */
+  .get(
+    "/download/:userId/:jobId/:fileName/info",
+    async ({ params, user }) => {
+      const userId = user.id;
+      const job = await db
+        .query("SELECT * FROM jobs WHERE user_id = ? AND id = ?")
+        .get(user.id, params.jobId);
+
+      if (!job) {
+        return { error: "Job not found" };
+      }
+
+      const jobId = decodeURIComponent(params.jobId);
+      const fileName = sanitize(decodeURIComponent(params.fileName));
+      const filePath = `${outputDir}${userId}/${jobId}/${fileName}`;
+
+      const info = getChunkDownloadInfo(filePath);
+      
+      if (!info) {
+        return { error: "File not found" };
+      }
+
+      return {
+        ...info,
+        use_chunked: shouldUseChunkedDownload(filePath),
+      };
+    },
+    { auth: true }
+  )
+  /**
+   * 下載特定 chunk
+   */
+  .get(
+    "/download/:userId/:jobId/:fileName/chunk/:chunkIndex",
+    async ({ params, set, user }) => {
+      const userId = user.id;
+      const job = await db
+        .query("SELECT * FROM jobs WHERE user_id = ? AND id = ?")
+        .get(user.id, params.jobId);
+
+      if (!job) {
+        set.status = 404;
+        return { error: "Job not found" };
+      }
+
+      const jobId = decodeURIComponent(params.jobId);
+      const fileName = sanitize(decodeURIComponent(params.fileName));
+      const chunkIndex = parseInt(params.chunkIndex, 10);
+      const filePath = `${outputDir}${userId}/${jobId}/${fileName}`;
+
+      const info = getChunkDownloadInfo(filePath);
+      if (!info) {
+        set.status = 404;
+        return { error: "File not found" };
+      }
+
+      const chunkData = await getChunk(filePath, chunkIndex);
+      if (!chunkData) {
+        set.status = 404;
+        return { error: "Chunk not found" };
+      }
+
+      const headers = createChunkDownloadHeaders(info, chunkIndex, chunkData);
+      
+      for (const [key, value] of Object.entries(headers)) {
+        set.headers[key] = value;
+      }
+
+      return new Response(chunkData);
+    },
+    { auth: true }
+  )
+  /**
+   * Archive chunk 下載資訊
+   */
+  .get(
+    "/archive/:jobId/info",
+    async ({ params, user }) => {
+      const userId = user.id;
+      const job = await db
+        .query("SELECT * FROM jobs WHERE user_id = ? AND id = ?")
+        .get(user.id, params.jobId);
+
+      if (!job) {
+        return { error: "Job not found" };
+      }
+
+      const jobId = decodeURIComponent(params.jobId);
+      const archivePath = `${outputDir}${userId}/${jobId}/converted_files_${jobId}.tar`;
+
+      if (!existsSync(archivePath)) {
+        return { error: "Archive not found" };
+      }
+
+      const info = getChunkDownloadInfo(archivePath);
+      
+      if (!info) {
+        return { error: "Archive not found" };
+      }
+
+      return {
+        ...info,
+        use_chunked: shouldUseChunkedDownload(archivePath),
+      };
+    },
+    { auth: true }
+  )
+  /**
+   * Archive chunk 下載
+   */
+  .get(
+    "/archive/:jobId/chunk/:chunkIndex",
+    async ({ params, set, user }) => {
+      const userId = user.id;
+      const job = await db
+        .query("SELECT * FROM jobs WHERE user_id = ? AND id = ?")
+        .get(user.id, params.jobId);
+
+      if (!job) {
+        set.status = 404;
+        return { error: "Job not found" };
+      }
+
+      const jobId = decodeURIComponent(params.jobId);
+      const chunkIndex = parseInt(params.chunkIndex, 10);
+      const archivePath = `${outputDir}${userId}/${jobId}/converted_files_${jobId}.tar`;
+
+      const info = getChunkDownloadInfo(archivePath);
+      if (!info) {
+        set.status = 404;
+        return { error: "Archive not found" };
+      }
+
+      const chunkData = await getChunk(archivePath, chunkIndex);
+      if (!chunkData) {
+        set.status = 404;
+        return { error: "Chunk not found" };
+      }
+
+      const headers = createChunkDownloadHeaders(info, chunkIndex, chunkData);
+      
+      for (const [key, value] of Object.entries(headers)) {
+        set.headers[key] = value;
+      }
+
+      return new Response(chunkData);
+    },
+    { auth: true }
+  );
--- a/src/pages/uploadChunk.tsx
+++ b/src/pages/uploadChunk.tsx
@ -0,0 +1,88 @@
+/**
+ * Contents.CN Chunk 上傳 API
+ * 
+ * 處理大檔的分段上傳
+ */
+
+import { Elysia, t } from "elysia";
+import { WEBROOT } from "../helpers/env";
+import { uploadsDir } from "../index";
+import { userService } from "./user";
+import sanitize from "sanitize-filename";
+import {
+  handleChunkUpload,
+  shouldUseChunkedUpload,
+  CHUNK_SIZE_BYTES,
+  calculateChunkCount,
+} from "../transfer";
+
+export const uploadChunk = new Elysia().use(userService).post(
+  "/upload-chunk",
+  async ({ body, user, cookie: { jobId } }) => {
+    if (!jobId?.value) {
+      return {
+        success: false,
+        message: "No active job session",
+      };
+    }
+
+    const { upload_id, chunk_index, total_chunks, file_name, total_size, chunk } = body;
+
+    const sanitizedFileName = sanitize(file_name);
+    const userUploadsDir = `${uploadsDir}${user.id}/${jobId.value}/`;
+
+    // 取得 chunk 資料
+    const chunkData = chunk instanceof Blob ? await chunk.arrayBuffer() : chunk;
+
+    const result = await handleChunkUpload(
+      upload_id,
+      parseInt(chunk_index, 10),
+      parseInt(total_chunks, 10),
+      chunkData,
+      sanitizedFileName,
+      parseInt(total_size, 10),
+      user.id,
+      jobId.value,
+      `${uploadsDir}${user.id}/`,
+      userUploadsDir
+    );
+
+    return result;
+  },
+  {
+    body: t.Object({
+      upload_id: t.String(),
+      chunk_index: t.String(),
+      total_chunks: t.String(),
+      file_name: t.String(),
+      total_size: t.String(),
+      chunk: t.File(),
+    }),
+    auth: true,
+  }
+);
+
+/**
+ * 取得上傳資訊（用於前端判斷是否需要 chunk 上傳）
+ */
+export const uploadInfo = new Elysia().use(userService).post(
+  "/upload-info",
+  async ({ body }) => {
+    const { file_size } = body;
+    const size = parseInt(file_size, 10);
+
+    const useChunked = shouldUseChunkedUpload(size);
+    
+    return {
+      use_chunked: useChunked,
+      chunk_size: CHUNK_SIZE_BYTES,
+      total_chunks: useChunked ? calculateChunkCount(size) : 1,
+    };
+  },
+  {
+    body: t.Object({
+      file_size: t.String(),
+    }),
+    auth: true,
+  }
+);
--- a/src/transfer/archiveManager.ts
+++ b/src/transfer/archiveManager.ts
@ -0,0 +1,154 @@
+/**
+ * Contents.CN 封裝管理器
+ * 
+ * 統一處理多檔輸出的封裝：
+ * - 唯一允許格式：.tar
+ * - 禁止：.tar.gz, .tgz, .zip 等
+ */
+
+import { existsSync, mkdirSync, readdirSync, statSync } from "node:fs";
+import { join, basename } from "node:path";
+import * as tar from "tar";
+import { ALLOWED_ARCHIVE_FORMAT, FORBIDDEN_ARCHIVE_FORMATS } from "./constants";
+
+/**
+ * 驗證封裝格式是否合法
+ */
+export function validateArchiveFormat(fileName: string): boolean {
+  const lowerName = fileName.toLowerCase();
+  
+  // 檢查是否使用禁止的格式
+  for (const forbidden of FORBIDDEN_ARCHIVE_FORMATS) {
+    if (lowerName.endsWith(forbidden)) {
+      return false;
+    }
+  }
+  
+  // 檢查是否是允許的格式
+  return lowerName.endsWith(ALLOWED_ARCHIVE_FORMAT);
+}
+
+/**
+ * 取得正確的封裝檔名（強制使用 .tar）
+ */
+export function getArchiveFileName(baseName: string): string {
+  const lowerName = baseName.toLowerCase();
+  
+  // 移除任何禁止的副檔名
+  let cleanName = baseName;
+  for (const forbidden of FORBIDDEN_ARCHIVE_FORMATS) {
+    if (lowerName.endsWith(forbidden)) {
+      cleanName = baseName.slice(0, -forbidden.length);
+      break;
+    }
+  }
+  
+  // 如果已經是 .tar 結尾，直接返回
+  if (cleanName.toLowerCase().endsWith(ALLOWED_ARCHIVE_FORMAT)) {
+    return cleanName;
+  }
+  
+  // 否則加上 .tar
+  return `${cleanName}${ALLOWED_ARCHIVE_FORMAT}`;
+}
+
+/**
+ * 建立 .tar 封裝（不壓縮）
+ * 
+ * @param sourceDir - 來源目錄
+ * @param outputPath - 輸出的 .tar 檔案路徑
+ * @param options - 額外選項
+ */
+export async function createTarArchive(
+  sourceDir: string,
+  outputPath: string,
+  options: {
+    filter?: (path: string) => boolean;
+    prefix?: string;
+  } = {}
+): Promise<string> {
+  // 強制確保輸出是 .tar 格式
+  const finalOutputPath = getArchiveFileName(outputPath);
+  
+  // 確保輸出目錄存在
+  const outputDir = join(finalOutputPath, "..");
+  if (!existsSync(outputDir)) {
+    mkdirSync(outputDir, { recursive: true });
+  }
+
+  // 取得要封裝的檔案列表
+  const files = readdirSync(sourceDir);
+  
+  // 預設過濾器：排除其他 tar 檔案
+  const defaultFilter = (path: string) => !path.match(/\.tar$/i);
+  const filter = options.filter || defaultFilter;
+
+  await tar.create(
+    {
+      file: finalOutputPath,
+      cwd: sourceDir,
+      filter: filter,
+      // 不使用 gzip 壓縮
+      gzip: false,
+    },
+    files.filter(f => filter(f))
+  );
+
+  console.log(`Created tar archive: ${finalOutputPath}`);
+  return finalOutputPath;
+}
+
+/**
+ * 建立用於多檔輸出的 .tar 封裝
+ * 
+ * @param outputDir - 輸出目錄（包含多個轉換結果）
+ * @param jobId - 任務 ID
+ */
+export async function createJobArchive(outputDir: string, jobId: string): Promise<string> {
+  const archiveName = `converted_files_${jobId}.tar`;
+  const archivePath = join(outputDir, archiveName);
+
+  await createTarArchive(outputDir, archivePath, {
+    filter: (path) => !path.endsWith(".tar"), // 排除其他 tar 檔案
+  });
+
+  return archivePath;
+}
+
+/**
+ * 從目錄封裝 MinerU 等多檔輸出引擎的結果
+ * 
+ * @param mineruOutputDir - MinerU 輸出目錄
+ * @param targetPath - 目標 .tar 路徑
+ */
+export async function createConverterArchive(
+  converterOutputDir: string,
+  targetPath: string
+): Promise<string> {
+  // 確保輸出使用 .tar 格式
+  const tarPath = getArchiveFileName(targetPath);
+  
+  await createTarArchive(converterOutputDir, tarPath);
+  
+  return tarPath;
+}
+
+/**
+ * 取得封裝檔案資訊
+ */
+export function getArchiveInfo(archivePath: string): {
+  exists: boolean;
+  size: number;
+  fileName: string;
+} | null {
+  if (!existsSync(archivePath)) {
+    return null;
+  }
+
+  const stats = statSync(archivePath);
+  return {
+    exists: true,
+    size: stats.size,
+    fileName: basename(archivePath),
+  };
+}
--- a/src/transfer/constants.ts
+++ b/src/transfer/constants.ts
@ -0,0 +1,38 @@
+/**
+ * Contents.CN 全域檔案傳輸常數
+ * 
+ * 這些常數定義了整個系統的檔案傳輸規則
+ */
+
+/**
+ * 檔案大小門檻（10MB）
+ * - 小於等於此值：直接傳輸
+ * - 大於此值：使用 chunk 分段傳輸
+ */
+export const CHUNK_THRESHOLD_BYTES = 10 * 1024 * 1024; // 10MB
+
+/**
+ * 每個 chunk 的大小（5MB）
+ */
+export const CHUNK_SIZE_BYTES = 5 * 1024 * 1024; // 5MB
+
+/**
+ * 上傳 session 過期時間（毫秒）
+ * 預設 1 小時
+ */
+export const UPLOAD_SESSION_TIMEOUT_MS = 60 * 60 * 1000; // 1 hour
+
+/**
+ * 暫存目錄名稱
+ */
+export const CHUNK_TEMP_DIR = "chunks_temp";
+
+/**
+ * 允許的封裝格式（僅 .tar）
+ */
+export const ALLOWED_ARCHIVE_FORMAT = ".tar";
+
+/**
+ * 禁止的封裝格式
+ */
+export const FORBIDDEN_ARCHIVE_FORMATS = [".tar.gz", ".tgz", ".zip", ".gz"];
--- a/src/transfer/downloadManager.ts
+++ b/src/transfer/downloadManager.ts
@ -0,0 +1,123 @@
+/**
+ * Contents.CN 後端下載管理器
+ * 
+ * 統一處理所有檔案下載，包含：
+ * - 小檔（≤10MB）：直接回傳
+ * - 大檔（>10MB）：chunk 分段下載
+ */
+
+import { existsSync, statSync, createReadStream } from "node:fs";
+import { CHUNK_THRESHOLD_BYTES, CHUNK_SIZE_BYTES } from "./constants";
+import type { ChunkDownloadInfo } from "./types";
+import { getTransferMode } from "./types";
+import { basename } from "node:path";
+
+/**
+ * 判斷檔案是否需要使用 chunk 下載
+ */
+export function shouldUseChunkedDownload(filePath: string): boolean {
+  if (!existsSync(filePath)) {
+    return false;
+  }
+  const stats = statSync(filePath);
+  return getTransferMode(stats.size, CHUNK_THRESHOLD_BYTES) === "chunked";
+}
+
+/**
+ * 取得檔案的 chunk 下載資訊
+ */
+export function getChunkDownloadInfo(filePath: string): ChunkDownloadInfo | null {
+  if (!existsSync(filePath)) {
+    return null;
+  }
+
+  const stats = statSync(filePath);
+  const fileName = basename(filePath);
+
+  return {
+    total_size: stats.size,
+    total_chunks: Math.ceil(stats.size / CHUNK_SIZE_BYTES),
+    chunk_size: CHUNK_SIZE_BYTES,
+    file_name: fileName,
+  };
+}
+
+/**
+ * 取得特定 chunk 的資料
+ */
+export async function getChunk(
+  filePath: string, 
+  chunkIndex: number, 
+  chunkSize: number = CHUNK_SIZE_BYTES
+): Promise<Buffer | null> {
+  if (!existsSync(filePath)) {
+    return null;
+  }
+
+  const stats = statSync(filePath);
+  const start = chunkIndex * chunkSize;
+  const end = Math.min(start + chunkSize, stats.size);
+
+  if (start >= stats.size) {
+    return null;
+  }
+
+  return new Promise((resolve, reject) => {
+    const chunks: Buffer[] = [];
+    const stream = createReadStream(filePath, { start, end: end - 1 });
+
+    stream.on("data", (chunk) => {
+      chunks.push(chunk as Buffer);
+    });
+
+    stream.on("end", () => {
+      resolve(Buffer.concat(chunks));
+    });
+
+    stream.on("error", reject);
+  });
+}
+
+/**
+ * 直接取得完整檔案（小檔用）
+ */
+export function getFileForDirectDownload(filePath: string): ReturnType<typeof Bun.file> | null {
+  if (!existsSync(filePath)) {
+    return null;
+  }
+  return Bun.file(filePath);
+}
+
+/**
+ * 建立 chunk 下載回應的 headers
+ */
+export function createChunkDownloadHeaders(
+  info: ChunkDownloadInfo, 
+  chunkIndex: number, 
+  chunkData: Buffer
+): Record<string, string> {
+  const start = chunkIndex * info.chunk_size;
+  const end = start + chunkData.length - 1;
+
+  return {
+    "Content-Type": "application/octet-stream",
+    "Content-Length": chunkData.length.toString(),
+    "Content-Range": `bytes ${start}-${end}/${info.total_size}`,
+    "Accept-Ranges": "bytes",
+    "X-Chunk-Index": chunkIndex.toString(),
+    "X-Total-Chunks": info.total_chunks.toString(),
+    "X-File-Name": encodeURIComponent(info.file_name),
+    "X-Total-Size": info.total_size.toString(),
+  };
+}
+
+/**
+ * 建立直接下載回應的 headers
+ */
+export function createDirectDownloadHeaders(fileName: string, fileSize: number): Record<string, string> {
+  return {
+    "Content-Type": "application/octet-stream",
+    "Content-Length": fileSize.toString(),
+    "Content-Disposition": `attachment; filename="${encodeURIComponent(fileName)}"`,
+  };
+}
--- a/src/transfer/index.ts
+++ b/src/transfer/index.ts
@ -0,0 +1,56 @@
+/**
+ * Contents.CN 全域檔案傳輸模組
+ * 
+ * 統一匯出所有傳輸相關功能
+ */
+
+// 常數
+export {
+  CHUNK_THRESHOLD_BYTES,
+  CHUNK_SIZE_BYTES,
+  UPLOAD_SESSION_TIMEOUT_MS,
+  CHUNK_TEMP_DIR,
+  ALLOWED_ARCHIVE_FORMAT,
+  FORBIDDEN_ARCHIVE_FORMATS,
+} from "./constants";
+
+// 類型
+export type {
+  ChunkUploadRequest,
+  ChunkUploadResponse,
+  DirectUploadResponse,
+  ChunkDownloadInfo,
+  UploadSession,
+  TransferMode,
+} from "./types";
+
+export { getTransferMode } from "./types";
+
+// 上傳管理
+export {
+  uploadSessionManager,
+  shouldUseChunkedUpload,
+  handleDirectUpload,
+  handleChunkUpload,
+  calculateChunkCount,
+} from "./uploadManager";
+
+// 下載管理
+export {
+  shouldUseChunkedDownload,
+  getChunkDownloadInfo,
+  getChunk,
+  getFileForDirectDownload,
+  createChunkDownloadHeaders,
+  createDirectDownloadHeaders,
+} from "./downloadManager";
+
+// 封裝管理
+export {
+  validateArchiveFormat,
+  getArchiveFileName,
+  createTarArchive,
+  createJobArchive,
+  createConverterArchive,
+  getArchiveInfo,
+} from "./archiveManager";
--- a/src/transfer/types.ts
+++ b/src/transfer/types.ts
@ -0,0 +1,94 @@
+/**
+ * Contents.CN 檔案傳輸類型定義
+ */
+
+/**
+ * Chunk 上傳請求結構
+ */
+export interface ChunkUploadRequest {
+  /** 上傳會話 ID（UUID） */
+  upload_id: string;
+  /** 當前 chunk 索引（從 0 開始） */
+  chunk_index: number;
+  /** 總 chunk 數量 */
+  total_chunks: number;
+  /** chunk 數據 */
+  data: Blob | ArrayBuffer;
+  /** 原始檔案名稱 */
+  file_name: string;
+  /** 檔案總大小 */
+  total_size: number;
+}
+
+/**
+ * Chunk 上傳回應結構
+ */
+export interface ChunkUploadResponse {
+  success: boolean;
+  message: string;
+  /** 已接收的 chunks 索引列表 */
+  received_chunks?: number[];
+  /** 是否所有 chunks 都已接收完成 */
+  completed?: boolean;
+  /** 合併後的檔案路徑（僅完成時返回） */
+  file_path?: string;
+}
+
+/**
+ * 直接上傳回應結構
+ */
+export interface DirectUploadResponse {
+  success: boolean;
+  message: string;
+  file_path?: string;
+}
+
+/**
+ * Chunk 下載資訊
+ */
+export interface ChunkDownloadInfo {
+  /** 檔案總大小 */
+  total_size: number;
+  /** chunk 數量 */
+  total_chunks: number;
+  /** 每個 chunk 大小 */
+  chunk_size: number;
+  /** 檔案名稱 */
+  file_name: string;
+}
+
+/**
+ * 上傳會話狀態
+ */
+export interface UploadSession {
+  /** 上傳 ID */
+  upload_id: string;
+  /** 使用者 ID */
+  user_id: string;
+  /** Job ID */
+  job_id: string;
+  /** 檔案名稱 */
+  file_name: string;
+  /** 檔案總大小 */
+  total_size: number;
+  /** 總 chunk 數 */
+  total_chunks: number;
+  /** 已接收的 chunks */
+  received_chunks: Set<number>;
+  /** 建立時間 */
+  created_at: Date;
+  /** 暫存目錄路徑 */
+  temp_dir: string;
+}
+
+/**
+ * 傳輸模式
+ */
+export type TransferMode = "direct" | "chunked";
+
+/**
+ * 根據檔案大小決定傳輸模式
+ */
+export function getTransferMode(fileSize: number, thresholdBytes: number): TransferMode {
+  return fileSize <= thresholdBytes ? "direct" : "chunked";
+}
--- a/src/transfer/uploadManager.ts
+++ b/src/transfer/uploadManager.ts
@ -0,0 +1,303 @@
+/**
+ * Contents.CN 後端上傳管理器
+ * 
+ * 統一處理所有檔案上傳，包含：
+ * - 小檔（≤10MB）：直接接收
+ * - 大檔（>10MB）：chunk 接收與合併
+ */
+
+import { existsSync, mkdirSync, rmSync, readdirSync, createWriteStream, statSync } from "node:fs";
+import { join } from "node:path";
+import { CHUNK_THRESHOLD_BYTES, CHUNK_SIZE_BYTES, UPLOAD_SESSION_TIMEOUT_MS, CHUNK_TEMP_DIR } from "./constants";
+import type { UploadSession, ChunkUploadResponse, DirectUploadResponse } from "./types";
+import { getTransferMode } from "./types";
+
+/**
+ * 上傳會話管理器
+ * 用於追蹤進行中的 chunk 上傳
+ */
+class UploadSessionManager {
+  private sessions: Map<string, UploadSession> = new Map();
+  private cleanupInterval: ReturnType<typeof setInterval> | null = null;
+
+  constructor() {
+    // 定期清理過期的 sessions
+    this.cleanupInterval = setInterval(() => {
+      this.cleanupExpiredSessions();
+    }, 5 * 60 * 1000); // 每 5 分鐘清理一次
+  }
+
+  /**
+   * 建立新的上傳會話
+   */
+  createSession(
+    uploadId: string,
+    userId: string,
+    jobId: string,
+    fileName: string,
+    totalSize: number,
+    totalChunks: number,
+    baseTempDir: string
+  ): UploadSession {
+    const tempDir = join(baseTempDir, CHUNK_TEMP_DIR, uploadId);
+    
+    if (!existsSync(tempDir)) {
+      mkdirSync(tempDir, { recursive: true });
+    }
+
+    const session: UploadSession = {
+      upload_id: uploadId,
+      user_id: userId,
+      job_id: jobId,
+      file_name: fileName,
+      total_size: totalSize,
+      total_chunks: totalChunks,
+      received_chunks: new Set(),
+      created_at: new Date(),
+      temp_dir: tempDir,
+    };
+
+    this.sessions.set(uploadId, session);
+    return session;
+  }
+
+  /**
+   * 取得上傳會話
+   */
+  getSession(uploadId: string): UploadSession | undefined {
+    return this.sessions.get(uploadId);
+  }
+
+  /**
+   * 更新已接收的 chunk
+   */
+  markChunkReceived(uploadId: string, chunkIndex: number): boolean {
+    const session = this.sessions.get(uploadId);
+    if (!session) return false;
+    
+    session.received_chunks.add(chunkIndex);
+    return true;
+  }
+
+  /**
+   * 檢查是否所有 chunks 都已接收
+   */
+  isComplete(uploadId: string): boolean {
+    const session = this.sessions.get(uploadId);
+    if (!session) return false;
+    
+    return session.received_chunks.size === session.total_chunks;
+  }
+
+  /**
+   * 移除會話並清理暫存檔案
+   */
+  removeSession(uploadId: string): void {
+    const session = this.sessions.get(uploadId);
+    if (session && existsSync(session.temp_dir)) {
+      rmSync(session.temp_dir, { recursive: true, force: true });
+    }
+    this.sessions.delete(uploadId);
+  }
+
+  /**
+   * 清理過期的會話
+   */
+  private cleanupExpiredSessions(): void {
+    const now = Date.now();
+    for (const [uploadId, session] of this.sessions) {
+      if (now - session.created_at.getTime() > UPLOAD_SESSION_TIMEOUT_MS) {
+        console.log(`Cleaning up expired upload session: ${uploadId}`);
+        this.removeSession(uploadId);
+      }
+    }
+  }
+
+  /**
+   * 停止清理計時器
+   */
+  destroy(): void {
+    if (this.cleanupInterval) {
+      clearInterval(this.cleanupInterval);
+      this.cleanupInterval = null;
+    }
+  }
+}
+
+// 單例實例
+export const uploadSessionManager = new UploadSessionManager();
+
+/**
+ * 判斷檔案是否需要使用 chunk 上傳
+ */
+export function shouldUseChunkedUpload(fileSize: number): boolean {
+  return getTransferMode(fileSize, CHUNK_THRESHOLD_BYTES) === "chunked";
+}
+
+/**
+ * 處理直接上傳（小檔）
+ */
+export async function handleDirectUpload(
+  file: File,
+  targetDir: string,
+  fileName: string
+): Promise<DirectUploadResponse> {
+  try {
+    const targetPath = join(targetDir, fileName);
+    
+    if (!existsSync(targetDir)) {
+      mkdirSync(targetDir, { recursive: true });
+    }
+
+    await Bun.write(targetPath, file);
+
+    return {
+      success: true,
+      message: "File uploaded successfully.",
+      file_path: targetPath,
+    };
+  } catch (error) {
+    console.error("Direct upload failed:", error);
+    return {
+      success: false,
+      message: `Upload failed: ${error}`,
+    };
+  }
+}
+
+/**
+ * 處理 chunk 上傳
+ */
+export async function handleChunkUpload(
+  uploadId: string,
+  chunkIndex: number,
+  totalChunks: number,
+  chunkData: ArrayBuffer | Blob | Buffer,
+  fileName: string,
+  totalSize: number,
+  userId: string,
+  jobId: string,
+  baseTempDir: string,
+  targetDir: string
+): Promise<ChunkUploadResponse> {
+  try {
+    // 取得或建立會話
+    let session = uploadSessionManager.getSession(uploadId);
+    
+    if (!session) {
+      session = uploadSessionManager.createSession(
+        uploadId,
+        userId,
+        jobId,
+        fileName,
+        totalSize,
+        totalChunks,
+        baseTempDir
+      );
+    }
+
+    // 驗證會話資訊一致性
+    if (session.total_chunks !== totalChunks || session.file_name !== fileName) {
+      return {
+        success: false,
+        message: "Session mismatch: inconsistent upload parameters",
+      };
+    }
+
+    // 儲存 chunk
+    const chunkPath = join(session.temp_dir, `chunk_${chunkIndex.toString().padStart(6, "0")}`);
+    // 處理不同類型的 chunk 資料
+    let data: ArrayBuffer | Buffer;
+    if (chunkData instanceof Blob) {
+      data = await chunkData.arrayBuffer();
+    } else if (Buffer.isBuffer(chunkData)) {
+      data = chunkData;
+    } else {
+      data = chunkData;
+    }
+    await Bun.write(chunkPath, data);
+
+    // 標記已接收
+    uploadSessionManager.markChunkReceived(uploadId, chunkIndex);
+
+    // 檢查是否完成
+    if (uploadSessionManager.isComplete(uploadId)) {
+      // 合併所有 chunks
+      const finalPath = await mergeChunks(session, targetDir);
+      
+      // 清理會話
+      uploadSessionManager.removeSession(uploadId);
+
+      return {
+        success: true,
+        message: "Upload completed and merged successfully.",
+        received_chunks: Array.from({ length: totalChunks }, (_, i) => i),
+        completed: true,
+        file_path: finalPath,
+      };
+    }
+
+    return {
+      success: true,
+      message: `Chunk ${chunkIndex + 1}/${totalChunks} received.`,
+      received_chunks: Array.from(session.received_chunks),
+      completed: false,
+    };
+  } catch (error) {
+    console.error("Chunk upload failed:", error);
+    return {
+      success: false,
+      message: `Chunk upload failed: ${error}`,
+    };
+  }
+}
+
+/**
+ * 合併所有 chunks 為完整檔案
+ */
+async function mergeChunks(session: UploadSession, targetDir: string): Promise<string> {
+  const targetPath = join(targetDir, session.file_name);
+  
+  if (!existsSync(targetDir)) {
+    mkdirSync(targetDir, { recursive: true });
+  }
+
+  // 讀取並排序所有 chunks
+  const chunkFiles = readdirSync(session.temp_dir)
+    .filter(f => f.startsWith("chunk_"))
+    .sort();
+
+  // 建立輸出串流
+  const writeStream = createWriteStream(targetPath);
+
+  // 依序寫入每個 chunk
+  for (const chunkFile of chunkFiles) {
+    const chunkPath = join(session.temp_dir, chunkFile);
+    const chunkData = await Bun.file(chunkPath).arrayBuffer();
+    writeStream.write(Buffer.from(chunkData));
+  }
+
+  // 結束寫入
+  await new Promise<void>((resolve, reject) => {
+    writeStream.end((err: Error | null) => {
+      if (err) reject(err);
+      else resolve();
+    });
+  });
+
+  // 驗證檔案大小
+  const finalStats = statSync(targetPath);
+  if (finalStats.size !== session.total_size) {
+    console.warn(`File size mismatch: expected ${session.total_size}, got ${finalStats.size}`);
+  }
+
+  console.log(`Successfully merged ${chunkFiles.length} chunks into ${targetPath}`);
+  return targetPath;
+}
+
+/**
+ * 計算需要的 chunk 數量
+ */
+export function calculateChunkCount(fileSize: number, chunkSize: number = CHUNK_SIZE_BYTES): number {
+  return Math.ceil(fileSize / chunkSize);
+}
--- a/tests/converters/mineru.test.ts
+++ b/tests/converters/mineru.test.ts
@ -67,12 +67,13 @@ describe("MinerU converter md-t mode", () => {
        writeFileSync(join(autoDir, "output.md"), "# Test\n\n| Col1 | Col2 |\n|---|---|\n| A | B |");
        callback(null, "MinerU conversion complete", "");
      } else if (cmd === "tar") {
-        // Simulate tar.gz creation
+        // Simulate .tar creation (no compression)
        callback(null, "Archive created", "");
      }
    };

-    const targetPath = join(testDir, "output.tar.gz");
+    // 使用 .tar 格式（不是 .tar.gz）
+    const targetPath = join(testDir, "output.tar");
    await convert("test.pdf", "pdf", "md-t", targetPath, undefined, mockExecFile);

    expect(mineruArgs).toContain("--table-mode");
@ -118,12 +119,13 @@ describe("MinerU converter md-i mode", () => {
        writeFileSync(join(autoDir, "output.md"), "# Test\n\n![Table](images/table_1.png)");
        callback(null, "MinerU conversion complete", "");
      } else if (cmd === "tar") {
-        // Simulate tar.gz creation
+        // Simulate .tar creation (no compression)
        callback(null, "Archive created", "");
      }
    };

-    const targetPath = join(testDir, "output.tar.gz");
+    // 使用 .tar 格式（不是 .tar.gz）
+    const targetPath = join(testDir, "output.tar");
    await convert("test.pdf", "pdf", "md-i", targetPath, undefined, mockExecFile);

    expect(capturedArgs).toContain("--table-mode");
@ -131,8 +133,8 @@ describe("MinerU converter md-i mode", () => {
  });
 });

-describe("MinerU converter tar.gz output", () => {
-  const testDir = "./test-output-mineru-targz";
+describe("MinerU converter .tar output (no compression)", () => {
+  const testDir = "./test-output-mineru-tar";
  
  beforeEach(() => {
    if (!existsSync(testDir)) {
@ -146,7 +148,7 @@ describe("MinerU converter tar.gz output", () => {
    }
  });

-  test("should create tar.gz archive from output", async () => {
+  test("should create .tar archive from output (without gzip)", async () => {
    let tarCalled = false;
    let tarArgs: string[] = [];
    
@ -177,12 +179,16 @@ describe("MinerU converter tar.gz output", () => {
      }
    };

-    const targetPath = join(testDir, "output.tar.gz");
+    // 使用 .tar 格式
+    const targetPath = join(testDir, "output.tar");
    const result = await convert("test.pdf", "pdf", "md-t", targetPath, undefined, mockExecFile);

    expect(result).toBe("Done");
    expect(tarCalled).toBe(true);
-    expect(tarArgs).toContain("-czf");
+    // 驗證使用 -cf 而非 -czf（不壓縮）
+    expect(tarArgs).toContain("-cf");
+    // 確保沒有使用 gzip 壓縮標誌
+    expect(tarArgs).not.toContain("-czf");
  });

  test("should reject on mineru error", async () => {
@ -197,12 +203,12 @@ describe("MinerU converter tar.gz output", () => {
      }
    };

-    const targetPath = join(testDir, "output.tar.gz");
+    const targetPath = join(testDir, "output.tar");
    expect(convert("test.pdf", "pdf", "md-t", targetPath, undefined, mockExecFile))
      .rejects.toMatch(/mineru error/);
  });

-  test("should use correct tar arguments for compression", async () => {
+  test("should use correct tar arguments without compression", async () => {
    let tarArgs: string[] = [];
    
    const mockExecFile: ExecFileFn = (
@ -228,13 +234,50 @@ describe("MinerU converter tar.gz output", () => {
      }
    };

-    const targetPath = join(testDir, "test_MINERU_md-t.tar.gz");
+    // 使用 .tar 格式（不是 .tar.gz）
+    const targetPath = join(testDir, "test_MINERU_md-t.tar");
    await convert("test.pdf", "pdf", "md-t", targetPath, undefined, mockExecFile);

-    // Verify tar is called with correct compression flags
-    expect(tarArgs[0]).toBe("-czf");
-    expect(tarArgs[1]).toContain(".tar.gz");
+    // 驗證 tar 使用正確的無壓縮標誌
+    expect(tarArgs[0]).toBe("-cf");
+    expect(tarArgs[1]).toContain(".tar");
+    expect(tarArgs[1]).not.toContain(".tar.gz");
    expect(tarArgs[2]).toBe("-C");
    expect(tarArgs[4]).toBe(".");
  });
+
+  test("should convert .tar.gz target path to .tar", async () => {
+    let tarOutputPath = "";
+    
+    const mockExecFile: ExecFileFn = (
+      cmd: string,
+      args: string[],
+      callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
+      options?: any,
+    ) => {
+      if (cmd === "mineru") {
+        const outputDir = args[3];
+        if (outputDir && !existsSync(outputDir)) {
+          mkdirSync(outputDir, { recursive: true });
+        }
+        const autoDir = join(outputDir, "auto");
+        if (!existsSync(autoDir)) {
+          mkdirSync(autoDir, { recursive: true });
+        }
+        writeFileSync(join(autoDir, "output.md"), "# Test");
+        callback(null, "Done", "");
+      } else if (cmd === "tar") {
+        tarOutputPath = args[1]; // 輸出路徑
+        callback(null, "Archive created", "");
+      }
+    };
+
+    // 即使傳入 .tar.gz，也應該被轉換為 .tar
+    const targetPath = join(testDir, "output.tar.gz");
+    await convert("test.pdf", "pdf", "md-t", targetPath, undefined, mockExecFile);
+
+    // 驗證輸出是 .tar 而非 .tar.gz
+    expect(tarOutputPath).toContain(".tar");
+    expect(tarOutputPath).not.toContain(".tar.gz");
+  });
 });
--- a/tests/transfer/chunk-download.test.ts
+++ b/tests/transfer/chunk-download.test.ts
@ -0,0 +1,208 @@
+/**
+ * Contents.CN Chunk 下載整合測試
+ * 
+ * 測試大檔 chunk 下載的完整流程
+ */
+
+import { test, expect, describe, beforeEach, afterEach } from "bun:test";
+import { mkdirSync, existsSync, writeFileSync, rmSync } from "node:fs";
+import { join } from "node:path";
+import {
+  shouldUseChunkedDownload,
+  getChunkDownloadInfo,
+  getChunk,
+  createChunkDownloadHeaders,
+} from "../../src/transfer/downloadManager";
+import { CHUNK_SIZE_BYTES, CHUNK_THRESHOLD_BYTES } from "../../src/transfer/constants";
+
+const testDir = "./test-output-chunk-download";
+
+describe("Chunk 下載資訊測試", () => {
+  beforeEach(() => {
+    if (!existsSync(testDir)) {
+      mkdirSync(testDir, { recursive: true });
+    }
+  });
+
+  afterEach(() => {
+    if (existsSync(testDir)) {
+      rmSync(testDir, { recursive: true, force: true });
+    }
+  });
+
+  test("getChunkDownloadInfo 應返回正確的下載資訊", () => {
+    const testFile = join(testDir, "large-file.bin");
+    const fileSize = 25 * 1024 * 1024; // 25MB
+    
+    // 建立一個假檔案（只寫入少量資料模擬）
+    const content = Buffer.alloc(1024, "X"); // 1KB
+    writeFileSync(testFile, content);
+
+    const info = getChunkDownloadInfo(testFile);
+
+    expect(info).not.toBeNull();
+    expect(info!.file_name).toBe("large-file.bin");
+    expect(info!.total_size).toBe(1024);
+    expect(info!.chunk_size).toBe(CHUNK_SIZE_BYTES);
+    expect(info!.total_chunks).toBe(1); // 1KB 只需要 1 chunk
+  });
+
+  test("不存在的檔案應返回 null", () => {
+    const info = getChunkDownloadInfo(join(testDir, "non-existent.bin"));
+    expect(info).toBeNull();
+  });
+});
+
+describe("Chunk 讀取測試", () => {
+  beforeEach(() => {
+    if (!existsSync(testDir)) {
+      mkdirSync(testDir, { recursive: true });
+    }
+  });
+
+  afterEach(() => {
+    if (existsSync(testDir)) {
+      rmSync(testDir, { recursive: true, force: true });
+    }
+  });
+
+  test("getChunk 應正確讀取指定的 chunk", async () => {
+    const testFile = join(testDir, "chunked-file.bin");
+    
+    // 建立測試檔案：20 bytes，分成 4 個 5-byte chunks
+    const content = "AAAAABBBBBCCCCCDDDD"; // 19 bytes
+    writeFileSync(testFile, content);
+
+    // 讀取第一個 chunk（5 bytes）
+    const chunk0 = await getChunk(testFile, 0, 5);
+    expect(chunk0!.toString()).toBe("AAAAA");
+
+    // 讀取第二個 chunk
+    const chunk1 = await getChunk(testFile, 1, 5);
+    expect(chunk1!.toString()).toBe("BBBBB");
+
+    // 讀取第三個 chunk
+    const chunk2 = await getChunk(testFile, 2, 5);
+    expect(chunk2!.toString()).toBe("CCCCC");
+
+    // 讀取最後一個 chunk（只有 4 bytes）
+    const chunk3 = await getChunk(testFile, 3, 5);
+    expect(chunk3!.toString()).toBe("DDDD");
+  });
+
+  test("讀取超出範圍的 chunk 應返回 null", async () => {
+    const testFile = join(testDir, "small-file.txt");
+    writeFileSync(testFile, "Hello");
+
+    const chunk = await getChunk(testFile, 10, 5); // 超出範圍
+    expect(chunk).toBeNull();
+  });
+
+  test("不存在的檔案應返回 null", async () => {
+    const chunk = await getChunk(join(testDir, "non-existent.bin"), 0, 5);
+    expect(chunk).toBeNull();
+  });
+});
+
+describe("Chunk 下載 Headers 測試", () => {
+  test("createChunkDownloadHeaders 應生成正確的 headers", () => {
+    const info = {
+      total_size: 1000,
+      total_chunks: 4,
+      chunk_size: 256,
+      file_name: "test-file.bin",
+    };
+
+    const chunkData = Buffer.alloc(256, "X");
+    const headers = createChunkDownloadHeaders(info, 0, chunkData);
+
+    expect(headers["Content-Type"]).toBe("application/octet-stream");
+    expect(headers["Content-Length"]).toBe("256");
+    expect(headers["Content-Range"]).toBe("bytes 0-255/1000");
+    expect(headers["Accept-Ranges"]).toBe("bytes");
+    expect(headers["X-Chunk-Index"]).toBe("0");
+    expect(headers["X-Total-Chunks"]).toBe("4");
+    expect(headers["X-Total-Size"]).toBe("1000");
+  });
+
+  test("最後一個 chunk 的 headers 應正確", () => {
+    const info = {
+      total_size: 1000,
+      total_chunks: 4,
+      chunk_size: 256,
+      file_name: "test-file.bin",
+    };
+
+    // 最後一個 chunk 只有 232 bytes (1000 - 256*3)
+    const chunkData = Buffer.alloc(232, "Z");
+    const headers = createChunkDownloadHeaders(info, 3, chunkData);
+
+    expect(headers["Content-Length"]).toBe("232");
+    expect(headers["Content-Range"]).toBe("bytes 768-999/1000");
+    expect(headers["X-Chunk-Index"]).toBe("3");
+  });
+});
+
+describe("傳輸模式判斷測試", () => {
+  beforeEach(() => {
+    if (!existsSync(testDir)) {
+      mkdirSync(testDir, { recursive: true });
+    }
+  });
+
+  afterEach(() => {
+    if (existsSync(testDir)) {
+      rmSync(testDir, { recursive: true, force: true });
+    }
+  });
+
+  test("小檔（≤10MB）不應使用 chunk 下載", () => {
+    const smallFile = join(testDir, "small.txt");
+    writeFileSync(smallFile, "Small file content");
+    
+    expect(shouldUseChunkedDownload(smallFile)).toBe(false);
+  });
+
+  test("不存在的檔案不應使用 chunk 下載", () => {
+    expect(shouldUseChunkedDownload(join(testDir, "non-existent.bin"))).toBe(false);
+  });
+});
+
+describe("完整 chunk 下載流程測試", () => {
+  beforeEach(() => {
+    if (!existsSync(testDir)) {
+      mkdirSync(testDir, { recursive: true });
+    }
+  });
+
+  afterEach(() => {
+    if (existsSync(testDir)) {
+      rmSync(testDir, { recursive: true, force: true });
+    }
+  });
+
+  test("應能完整讀取並合併所有 chunks", async () => {
+    const testFile = join(testDir, "complete-file.bin");
+    const originalContent = "AAAAAABBBBBBCCCCCCDDDDDDEEEEEE"; // 30 bytes
+    writeFileSync(testFile, originalContent);
+
+    const info = getChunkDownloadInfo(testFile);
+    expect(info).not.toBeNull();
+
+    // 模擬分段讀取（每個 chunk 10 bytes）
+    const chunkSize = 10;
+    const totalChunks = Math.ceil(originalContent.length / chunkSize);
+    const chunks: Buffer[] = [];
+
+    for (let i = 0; i < totalChunks; i++) {
+      const chunk = await getChunk(testFile, i, chunkSize);
+      if (chunk) {
+        chunks.push(chunk);
+      }
+    }
+
+    // 合併所有 chunks
+    const mergedContent = Buffer.concat(chunks).toString();
+    expect(mergedContent).toBe(originalContent);
+  });
+});
--- a/tests/transfer/chunk-upload.test.ts
+++ b/tests/transfer/chunk-upload.test.ts
@ -0,0 +1,178 @@
+/**
+ * Contents.CN Chunk 上傳整合測試
+ * 
+ * 測試大檔 chunk 上傳的完整流程
+ */
+
+import { test, expect, describe, beforeEach, afterEach } from "bun:test";
+import { mkdirSync, existsSync, writeFileSync, rmSync, readFileSync, statSync } from "node:fs";
+import { join } from "node:path";
+import {
+  handleChunkUpload,
+  uploadSessionManager,
+  calculateChunkCount,
+} from "../../src/transfer/uploadManager";
+import { CHUNK_SIZE_BYTES } from "../../src/transfer/constants";
+
+const testDir = "./test-output-chunk-upload";
+
+describe("Chunk 上傳整合測試", () => {
+  beforeEach(() => {
+    if (!existsSync(testDir)) {
+      mkdirSync(testDir, { recursive: true });
+    }
+  });
+
+  afterEach(() => {
+    if (existsSync(testDir)) {
+      rmSync(testDir, { recursive: true, force: true });
+    }
+  });
+
+  test("多 chunk 上傳應正確合併", async () => {
+    const uploadId = "test-chunked-upload-1";
+    const fileName = "large-file.bin";
+    const userId = "test-user";
+    const jobId = "test-job";
+    
+    // 建立測試資料（模擬 15MB 檔案，分 3 個 chunks）
+    const chunkSize = 5 * 1024; // 使用較小的 chunk 以便測試
+    const chunk1 = Buffer.alloc(chunkSize, "A");
+    const chunk2 = Buffer.alloc(chunkSize, "B");
+    const chunk3 = Buffer.alloc(chunkSize, "C");
+    const totalSize = chunkSize * 3;
+    const totalChunks = 3;
+    
+    const baseTempDir = join(testDir, "temp");
+    const targetDir = join(testDir, "uploads");
+    mkdirSync(baseTempDir, { recursive: true });
+    mkdirSync(targetDir, { recursive: true });
+
+    // 上傳 chunk 1
+    const result1 = await handleChunkUpload(
+      uploadId, 0, totalChunks, chunk1, fileName, totalSize,
+      userId, jobId, baseTempDir, targetDir
+    );
+    expect(result1.success).toBe(true);
+    expect(result1.completed).toBe(false);
+    expect(result1.received_chunks).toContain(0);
+
+    // 上傳 chunk 2
+    const result2 = await handleChunkUpload(
+      uploadId, 1, totalChunks, chunk2, fileName, totalSize,
+      userId, jobId, baseTempDir, targetDir
+    );
+    expect(result2.success).toBe(true);
+    expect(result2.completed).toBe(false);
+
+    // 上傳 chunk 3（最後一個）
+    const result3 = await handleChunkUpload(
+      uploadId, 2, totalChunks, chunk3, fileName, totalSize,
+      userId, jobId, baseTempDir, targetDir
+    );
+    expect(result3.success).toBe(true);
+    expect(result3.completed).toBe(true);
+    expect(result3.file_path).toBeDefined();
+
+    // 驗證合併後的檔案
+    const mergedFile = join(targetDir, fileName);
+    expect(existsSync(mergedFile)).toBe(true);
+    
+    const mergedContent = readFileSync(mergedFile);
+    expect(mergedContent.length).toBe(totalSize);
+    
+    // 驗證內容正確性
+    const expectedContent = Buffer.concat([chunk1, chunk2, chunk3]);
+    expect(mergedContent.equals(expectedContent)).toBe(true);
+  });
+
+  test("亂序上傳 chunks 也應正確合併", async () => {
+    const uploadId = "test-chunked-upload-2";
+    const fileName = "out-of-order.bin";
+    const userId = "test-user";
+    const jobId = "test-job";
+    
+    const chunkSize = 1024;
+    const chunk0 = Buffer.alloc(chunkSize, "0");
+    const chunk1 = Buffer.alloc(chunkSize, "1");
+    const chunk2 = Buffer.alloc(chunkSize, "2");
+    const chunk3 = Buffer.alloc(chunkSize, "3");
+    const totalSize = chunkSize * 4;
+    const totalChunks = 4;
+    
+    const baseTempDir = join(testDir, "temp2");
+    const targetDir = join(testDir, "uploads2");
+    mkdirSync(baseTempDir, { recursive: true });
+    mkdirSync(targetDir, { recursive: true });
+
+    // 亂序上傳：3, 1, 0, 2
+    await handleChunkUpload(uploadId, 3, totalChunks, chunk3, fileName, totalSize, userId, jobId, baseTempDir, targetDir);
+    await handleChunkUpload(uploadId, 1, totalChunks, chunk1, fileName, totalSize, userId, jobId, baseTempDir, targetDir);
+    await handleChunkUpload(uploadId, 0, totalChunks, chunk0, fileName, totalSize, userId, jobId, baseTempDir, targetDir);
+    const finalResult = await handleChunkUpload(uploadId, 2, totalChunks, chunk2, fileName, totalSize, userId, jobId, baseTempDir, targetDir);
+
+    expect(finalResult.success).toBe(true);
+    expect(finalResult.completed).toBe(true);
+
+    // 驗證檔案順序正確
+    const mergedFile = join(targetDir, fileName);
+    const mergedContent = readFileSync(mergedFile);
+    
+    // 即使亂序上傳，合併後應該按正確順序
+    const expectedContent = Buffer.concat([chunk0, chunk1, chunk2, chunk3]);
+    expect(mergedContent.equals(expectedContent)).toBe(true);
+  });
+
+  test("重複上傳相同 chunk 應被處理", async () => {
+    const uploadId = "test-chunked-upload-3";
+    const fileName = "duplicate-chunk.bin";
+    const userId = "test-user";
+    const jobId = "test-job";
+    
+    const chunkSize = 512;
+    const chunk0 = Buffer.alloc(chunkSize, "X");
+    const chunk1 = Buffer.alloc(chunkSize, "Y");
+    const totalSize = chunkSize * 2;
+    const totalChunks = 2;
+    
+    const baseTempDir = join(testDir, "temp3");
+    const targetDir = join(testDir, "uploads3");
+    mkdirSync(baseTempDir, { recursive: true });
+    mkdirSync(targetDir, { recursive: true });
+
+    // 上傳 chunk 0
+    await handleChunkUpload(uploadId, 0, totalChunks, chunk0, fileName, totalSize, userId, jobId, baseTempDir, targetDir);
+    
+    // 重複上傳 chunk 0
+    await handleChunkUpload(uploadId, 0, totalChunks, chunk0, fileName, totalSize, userId, jobId, baseTempDir, targetDir);
+    
+    // 上傳 chunk 1
+    const result = await handleChunkUpload(uploadId, 1, totalChunks, chunk1, fileName, totalSize, userId, jobId, baseTempDir, targetDir);
+
+    expect(result.success).toBe(true);
+    expect(result.completed).toBe(true);
+
+    // 驗證檔案大小正確（不應該因為重複上傳而變大）
+    const mergedFile = join(targetDir, fileName);
+    const stats = statSync(mergedFile);
+    expect(stats.size).toBe(totalSize);
+  });
+});
+
+describe("Chunk 數量計算測試", () => {
+  test("應正確計算不同大小檔案的 chunk 數量", () => {
+    const chunkSize = CHUNK_SIZE_BYTES;
+    
+    // 剛好 1 個 chunk
+    expect(calculateChunkCount(chunkSize)).toBe(1);
+    
+    // 多 1 byte 需要 2 個 chunks
+    expect(calculateChunkCount(chunkSize + 1)).toBe(2);
+    
+    // 50MB 需要 10 個 chunks
+    expect(calculateChunkCount(50 * 1024 * 1024)).toBe(10);
+    
+    // 1 byte 需要 1 個 chunk
+    expect(calculateChunkCount(1)).toBe(1);
+  });
+});
--- a/tests/transfer/transfer.test.ts
+++ b/tests/transfer/transfer.test.ts
@ -0,0 +1,331 @@
+/**
+ * Contents.CN 全域檔案傳輸機制測試
+ * 
+ * 測試項目：
+ * 1. 小檔直傳測試（≤10MB）
+ * 2. 大檔 chunk 上傳測試（>10MB）
+ * 3. chunk 合併正確性測試
+ * 4. .tar 封裝測試
+ * 5. End-to-End 測試
+ */
+
+import { test, expect, describe, beforeEach, afterEach } from "bun:test";
+import { mkdirSync, existsSync, writeFileSync, rmSync, readFileSync, statSync } from "node:fs";
+import { join } from "node:path";
+import {
+  shouldUseChunkedUpload,
+  calculateChunkCount,
+  handleDirectUpload,
+  handleChunkUpload,
+  uploadSessionManager,
+} from "../../src/transfer/uploadManager";
+import {
+  shouldUseChunkedDownload,
+  getChunkDownloadInfo,
+  getChunk,
+} from "../../src/transfer/downloadManager";
+import {
+  validateArchiveFormat,
+  getArchiveFileName,
+  createTarArchive,
+} from "../../src/transfer/archiveManager";
+import {
+  CHUNK_THRESHOLD_BYTES,
+  CHUNK_SIZE_BYTES,
+  ALLOWED_ARCHIVE_FORMAT,
+  FORBIDDEN_ARCHIVE_FORMATS,
+} from "../../src/transfer/constants";
+import { getTransferMode } from "../../src/transfer/types";
+
+const testDir = "./test-output-transfer";
+
+describe("傳輸常數測試", () => {
+  test("CHUNK_THRESHOLD_BYTES 應為 10MB", () => {
+    expect(CHUNK_THRESHOLD_BYTES).toBe(10 * 1024 * 1024);
+  });
+
+  test("CHUNK_SIZE_BYTES 應為 5MB", () => {
+    expect(CHUNK_SIZE_BYTES).toBe(5 * 1024 * 1024);
+  });
+
+  test("唯一允許的封裝格式應為 .tar", () => {
+    expect(ALLOWED_ARCHIVE_FORMAT).toBe(".tar");
+  });
+
+  test("禁止的封裝格式應包含 .tar.gz, .tgz, .zip, .gz", () => {
+    expect(FORBIDDEN_ARCHIVE_FORMATS).toContain(".tar.gz");
+    expect(FORBIDDEN_ARCHIVE_FORMATS).toContain(".tgz");
+    expect(FORBIDDEN_ARCHIVE_FORMATS).toContain(".zip");
+    expect(FORBIDDEN_ARCHIVE_FORMATS).toContain(".gz");
+  });
+});
+
+describe("傳輸模式判斷測試", () => {
+  test("≤10MB 應使用直傳模式", () => {
+    expect(getTransferMode(10 * 1024 * 1024, CHUNK_THRESHOLD_BYTES)).toBe("direct");
+    expect(getTransferMode(5 * 1024 * 1024, CHUNK_THRESHOLD_BYTES)).toBe("direct");
+    expect(getTransferMode(1024, CHUNK_THRESHOLD_BYTES)).toBe("direct");
+    expect(getTransferMode(0, CHUNK_THRESHOLD_BYTES)).toBe("direct");
+  });
+
+  test(">10MB 應使用 chunk 模式", () => {
+    expect(getTransferMode(10 * 1024 * 1024 + 1, CHUNK_THRESHOLD_BYTES)).toBe("chunked");
+    expect(getTransferMode(50 * 1024 * 1024, CHUNK_THRESHOLD_BYTES)).toBe("chunked");
+    expect(getTransferMode(100 * 1024 * 1024, CHUNK_THRESHOLD_BYTES)).toBe("chunked");
+  });
+
+  test("shouldUseChunkedUpload 函數應正確判斷", () => {
+    expect(shouldUseChunkedUpload(10 * 1024 * 1024)).toBe(false);
+    expect(shouldUseChunkedUpload(10 * 1024 * 1024 + 1)).toBe(true);
+  });
+});
+
+describe("Chunk 數量計算測試", () => {
+  test("計算 chunk 數量應正確", () => {
+    // 10MB / 5MB = 2 chunks
+    expect(calculateChunkCount(10 * 1024 * 1024)).toBe(2);
+    
+    // 15MB / 5MB = 3 chunks
+    expect(calculateChunkCount(15 * 1024 * 1024)).toBe(3);
+    
+    // 1 byte 也需要 1 chunk
+    expect(calculateChunkCount(1)).toBe(1);
+    
+    // 5MB + 1 byte = 2 chunks
+    expect(calculateChunkCount(5 * 1024 * 1024 + 1)).toBe(2);
+  });
+});
+
+describe("封裝格式驗證測試", () => {
+  test("validateArchiveFormat 應正確驗證格式", () => {
+    // 允許的格式
+    expect(validateArchiveFormat("output.tar")).toBe(true);
+    expect(validateArchiveFormat("my_archive.tar")).toBe(true);
+    
+    // 禁止的格式
+    expect(validateArchiveFormat("output.tar.gz")).toBe(false);
+    expect(validateArchiveFormat("output.tgz")).toBe(false);
+    expect(validateArchiveFormat("output.zip")).toBe(false);
+    expect(validateArchiveFormat("output.gz")).toBe(false);
+  });
+
+  test("getArchiveFileName 應強制轉換為 .tar", () => {
+    // 已經是 .tar
+    expect(getArchiveFileName("output.tar")).toBe("output.tar");
+    
+    // 轉換 .tar.gz -> .tar
+    expect(getArchiveFileName("output.tar.gz")).toBe("output.tar");
+    
+    // 轉換 .tgz -> .tar
+    expect(getArchiveFileName("output.tgz")).toBe("output.tar");
+    
+    // 無副檔名 -> 加上 .tar
+    expect(getArchiveFileName("output")).toBe("output.tar");
+    
+    // .zip 也是禁止的格式，會被移除並加上 .tar
+    expect(getArchiveFileName("output.zip")).toBe("output.tar");
+    
+    // .gz 也是禁止的格式
+    expect(getArchiveFileName("output.gz")).toBe("output.tar");
+  });
+});
+
+describe("上傳管理測試", () => {
+  beforeEach(() => {
+    if (!existsSync(testDir)) {
+      mkdirSync(testDir, { recursive: true });
+    }
+  });
+
+  afterEach(() => {
+    if (existsSync(testDir)) {
+      rmSync(testDir, { recursive: true, force: true });
+    }
+  });
+
+  test("小檔直傳應成功", async () => {
+    const targetDir = join(testDir, "uploads");
+    const testContent = "Hello, World!";
+    const file = new File([testContent], "test.txt", { type: "text/plain" });
+
+    const result = await handleDirectUpload(file as any, targetDir, "test.txt");
+
+    expect(result.success).toBe(true);
+    expect(existsSync(join(targetDir, "test.txt"))).toBe(true);
+    expect(readFileSync(join(targetDir, "test.txt"), "utf-8")).toBe(testContent);
+  });
+});
+
+describe("下載管理測試", () => {
+  beforeEach(() => {
+    if (!existsSync(testDir)) {
+      mkdirSync(testDir, { recursive: true });
+    }
+  });
+
+  afterEach(() => {
+    if (existsSync(testDir)) {
+      rmSync(testDir, { recursive: true, force: true });
+    }
+  });
+
+  test("小檔不應使用 chunk 下載", () => {
+    const smallFile = join(testDir, "small.txt");
+    writeFileSync(smallFile, "Small content");
+    
+    expect(shouldUseChunkedDownload(smallFile)).toBe(false);
+  });
+
+  test("getChunkDownloadInfo 應返回正確資訊", () => {
+    const testFile = join(testDir, "test.txt");
+    const content = "Test content for download";
+    writeFileSync(testFile, content);
+
+    const info = getChunkDownloadInfo(testFile);
+
+    expect(info).not.toBeNull();
+    expect(info!.file_name).toBe("test.txt");
+    expect(info!.total_size).toBe(content.length);
+    expect(info!.chunk_size).toBe(CHUNK_SIZE_BYTES);
+  });
+
+  test("getChunk 應正確讀取 chunk 資料", async () => {
+    const testFile = join(testDir, "test.txt");
+    const content = "ABCDEFGHIJ"; // 10 bytes
+    writeFileSync(testFile, content);
+
+    // 讀取第一個 chunk（整個檔案，因為小於 chunk size）
+    const chunk = await getChunk(testFile, 0, 5);
+    
+    expect(chunk).not.toBeNull();
+    expect(chunk!.toString()).toBe("ABCDE");
+
+    // 讀取第二個 chunk
+    const chunk2 = await getChunk(testFile, 1, 5);
+    expect(chunk2!.toString()).toBe("FGHIJ");
+  });
+});
+
+describe(".tar 封裝測試", () => {
+  beforeEach(() => {
+    if (!existsSync(testDir)) {
+      mkdirSync(testDir, { recursive: true });
+    }
+  });
+
+  afterEach(() => {
+    if (existsSync(testDir)) {
+      rmSync(testDir, { recursive: true, force: true });
+    }
+  });
+
+  test("createTarArchive 應建立 .tar 檔案", async () => {
+    const sourceDir = join(testDir, "source");
+    const outputTar = join(testDir, "output.tar");
+    
+    mkdirSync(sourceDir, { recursive: true });
+    writeFileSync(join(sourceDir, "file1.txt"), "Content 1");
+    writeFileSync(join(sourceDir, "file2.txt"), "Content 2");
+
+    const result = await createTarArchive(sourceDir, outputTar);
+
+    expect(existsSync(result)).toBe(true);
+    expect(result.endsWith(".tar")).toBe(true);
+    expect(result).not.toContain(".tar.gz");
+  });
+
+  test("createTarArchive 應強制使用 .tar 格式", async () => {
+    const sourceDir = join(testDir, "source2");
+    // 即使傳入 .tar.gz，也應該輸出 .tar
+    const outputTar = join(testDir, "output.tar.gz");
+    
+    mkdirSync(sourceDir, { recursive: true });
+    writeFileSync(join(sourceDir, "file.txt"), "Content");
+
+    const result = await createTarArchive(sourceDir, outputTar);
+
+    // 結果應該是 .tar 而非 .tar.gz
+    expect(result.endsWith(".tar")).toBe(true);
+    expect(result).not.toContain(".tar.gz");
+  });
+});
+
+describe("End-to-End 測試", () => {
+  beforeEach(() => {
+    if (!existsSync(testDir)) {
+      mkdirSync(testDir, { recursive: true });
+    }
+  });
+
+  afterEach(() => {
+    if (existsSync(testDir)) {
+      rmSync(testDir, { recursive: true, force: true });
+    }
+  });
+
+  test("完整流程：上傳 -> 封裝 -> 下載資訊", async () => {
+    // 1. 模擬上傳
+    const uploadsDir = join(testDir, "uploads");
+    const outputDir = join(testDir, "output");
+    mkdirSync(uploadsDir, { recursive: true });
+    mkdirSync(outputDir, { recursive: true });
+
+    const uploadedFile = join(uploadsDir, "document.pdf");
+    writeFileSync(uploadedFile, "Fake PDF content");
+
+    // 2. 模擬轉換輸出
+    const conversionOutput = join(outputDir, "conversion_result");
+    mkdirSync(conversionOutput, { recursive: true });
+    writeFileSync(join(conversionOutput, "output.md"), "# Converted Document");
+    mkdirSync(join(conversionOutput, "images"), { recursive: true });
+    writeFileSync(join(conversionOutput, "images", "fig1.png"), "Fake image");
+
+    // 3. 建立 .tar 封裝
+    const tarPath = join(outputDir, "result.tar");
+    const archivePath = await createTarArchive(conversionOutput, tarPath);
+
+    expect(existsSync(archivePath)).toBe(true);
+    expect(archivePath.endsWith(".tar")).toBe(true);
+
+    // 4. 取得下載資訊
+    const downloadInfo = getChunkDownloadInfo(archivePath);
+    expect(downloadInfo).not.toBeNull();
+    expect(downloadInfo!.file_name).toBe("result.tar");
+
+    // 5. 驗證傳輸模式判斷
+    const fileStats = statSync(archivePath);
+    const shouldChunk = fileStats.size > CHUNK_THRESHOLD_BYTES;
+    expect(shouldUseChunkedDownload(archivePath)).toBe(shouldChunk);
+  });
+});
+
+describe("上傳會話管理測試", () => {
+  test("應正確建立和管理上傳會話", () => {
+    const uploadId = "test-upload-123";
+    const session = uploadSessionManager.createSession(
+      uploadId,
+      "user-1",
+      "job-1",
+      "large-file.pdf",
+      50 * 1024 * 1024, // 50MB
+      10, // 10 chunks
+      testDir
+    );
+
+    expect(session.upload_id).toBe(uploadId);
+    expect(session.total_chunks).toBe(10);
+    expect(session.received_chunks.size).toBe(0);
+
+    // 標記已接收 chunks
+    uploadSessionManager.markChunkReceived(uploadId, 0);
+    uploadSessionManager.markChunkReceived(uploadId, 1);
+    
+    const updatedSession = uploadSessionManager.getSession(uploadId);
+    expect(updatedSession!.received_chunks.size).toBe(2);
+    expect(uploadSessionManager.isComplete(uploadId)).toBe(false);
+
+    // 清理
+    uploadSessionManager.removeSession(uploadId);
+    expect(uploadSessionManager.getSession(uploadId)).toBeUndefined();
+  });
+});