feat: 前端 uploadFile 接口改为 OSS 直传

- 修改 uploadFile 方法使用 OSS 直传方式上传
- 新增 getOssToken 和 uploadToOss 方法
- 返回格式保持兼容，filePath 返回 OSS 完整 URL
- 自动添加环境前缀 (dev/test/prod)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

reading-platform-frontend/src/api/file.ts

@@ -1,4 +1,5 @@
 import axios from 'axios';
+import { buildOssDirPath } from '@/utils/env';
 
 const API_BASE = import.meta.env.VITE_API_BASE_URL || 'http://localhost:3000/api/v1';
 
@@ -16,50 +17,114 @@ export interface DeleteResult {
   message: string;
 }
 
+/**
+ * OSS 直传 Token 响应
+ */
+export interface OssToken {
+  accessid: string;
+  policy: string;
+  signature: string;
+  dir: string;
+  host: string;
+  key: string;
+  expire: number;
+}
+
 /**
  * 文件上传 API
  */
 export const fileApi = {
   /**
-   * 上传文件
+   * 获取阿里云 OSS 直传 Token
+   * 自动根据当前环境添加前缀（dev/test/prod）
+   *
+   * @param fileName 文件名
+   * @param dir 业务目录（如：avatar, course/cover），会自动添加环境前缀
+   * @returns OSS 直传 Token
+   */
+  getOssToken: async (
+    fileName: string,
+    dir?: string,
+  ): Promise<OssToken> => {
+    // 自动添加环境前缀
+    const fullDir = buildOssDirPath(dir);
+
+    const response = await axios.get<{ data: OssToken }>(`${API_BASE}/api/v1/files/oss/token`, {
+      params: { fileName, dir: fullDir },
+    });
+    return response.data.data;
+  },
+
+  /**
+   * 直接上传文件到阿里云 OSS
+   */
+  uploadToOss: async (
+    file: File,
+    token: OssToken,
+    onProgress?: (percent: number) => void,
+  ): Promise<{ url: string }> => {
+    const formData = new FormData();
+
+    // 按照阿里云 OSS PostObject 要求构造表单
+    formData.append('OSSAccessKeyId', token.accessid);
+    formData.append('policy', token.policy);
+    formData.append('signature', token.signature);
+    formData.append('key', token.key);
+    formData.append('x-oss-credential', token.accessid);
+    formData.append('file', file);
+
+    await axios.post(token.host, formData, {
+      headers: {
+        'Content-Type': 'multipart/form-data',
+      },
+      onUploadProgress: (progressEvent) => {
+        if (progressEvent.total && onProgress) {
+          const percentCompleted = Math.round((progressEvent.loaded * 100) / progressEvent.total);
+          onProgress(percentCompleted);
+        }
+      },
+    });
+
+    // 上传成功后返回文件访问 URL
+    return {
+      url: `${token.host}/${token.key}`,
+    };
+  },
+  /**
+   * 上传文件（使用 OSS 直传方式）
+   *
+   * @param file 要上传的文件
+   * @param type 文件类型（用于指定 OSS 目录前缀）
+   * @param _courseId 课程 ID（可选，用于关联业务 - 预留参数）
+   * @returns 上传结果，包含 OSS 文件 URL
    */
   uploadFile: async (
     file: File,
     type: 'cover' | 'ebook' | 'audio' | 'video' | 'ppt' | 'poster' | 'document' | 'other',
-    courseId?: number,
+    _courseId?: number,
   ): Promise<UploadResult> => {
-    const formData = new FormData();
-    formData.append('file', file);
-    formData.append('type', type);
-    if (courseId) {
-      formData.append('courseId', courseId.toString());
-    }
+    // 1. 获取 OSS 直传 Token（自动添加环境前缀）
+    const token = await getOssToken(file.name, type);
 
-    const response = await axios.post<UploadResult>(
-      `${API_BASE}/files/upload`,
-      formData,
-      {
-        headers: {
-          'Content-Type': 'multipart/form-data',
-        },
-        // 添加上传进度回调
-        onUploadProgress: (progressEvent) => {
-          if (progressEvent.total) {
-            const percentCompleted = Math.round((progressEvent.loaded * 100) / progressEvent.total);
-            console.log(`Upload progress: ${percentCompleted}%`);
-          }
-        },
-      },
-    );
+    // 2. 上传到 OSS
+    await uploadToOss(file, token);
 
-    return response.data;
+    // 3. 返回兼容格式的结果
+    return {
+      success: true,
+      filePath: `${token.host}/${token.key}`,
+      fileName: file.name,
+      originalName: file.name,
+      fileSize: file.size,
+      mimeType: file.type,
+    };
   },
 
   /**
    * 删除文件
    */
   deleteFile: async (filePath: string): Promise<DeleteResult> => {
-    const response = await axios.delete<DeleteResult>(`${API_BASE}/files/delete`, {
+    const response = await axios.delete<DeleteResult>(`${API_BASE}/api/v1/files/delete`, {
       data: { filePath },
     });
     return response.data;
@@ -132,3 +197,5 @@ export const validateFileType = (
 export const uploadFile = fileApi.uploadFile;
 export const deleteFile = fileApi.deleteFile;
 export const getFileUrl = fileApi.getFileUrl;
+export const getOssToken = fileApi.getOssToken;
+export const uploadToOss = fileApi.uploadToOss;