Merge branch 'PingChuan' into shiy-login

app/routes/api.dataset.dify-files.$.tsx

@@ -0,0 +1,80 @@
+import { type LoaderFunctionArgs } from '@remix-run/node';
+import { API_BASE_URL } from '~/config/api-config';
+
+/**
+ * GET /api/dataset/dify-files/*
+ * 代理 Dify 文件下载请求
+ *
+ * 用于下载 Dify 知识库中的原始文件
+ * 将 /api/dataset/dify-files/xxx 转发到 Dify 的 /files/xxx
+ */
+export async function loader({ request, params }: LoaderFunctionArgs) {
+    try {
+        const { getUserSession } = await import("~/api/login/auth.server");
+        const { frontendJWT } = await getUserSession(request);
+
+        if (!frontendJWT) {
+            return new Response(
+                JSON.stringify({ error: 'JWT认证失败，请重新登录' }),
+                { status: 401, headers: { 'Content-Type': 'application/json' } }
+            );
+        }
+
+        // 获取完整路径（包含查询参数）
+        const url = new URL(request.url);
+        const filePath = params['*'] || '';
+        const queryString = url.search;
+
+        console.log('[API] Dify File Proxy:', { filePath, queryString });
+
+        // 构建 Dify 文件下载 URL
+        // 使用专门的文件下载代理路由 /dify_file/
+        // 因为 Dify 文件 API (/files/) 不需要 /v1 前缀，与其他 API 不同
+        const difyFileUrl = `${API_BASE_URL}/dify_file/${filePath}${queryString}`;
+
+        console.log('[API] Proxying to:', difyFileUrl);
+
+        // 转发请求到 Dify
+        const response = await fetch(difyFileUrl, {
+            method: 'GET',
+            headers: {
+                'Authorization': `Bearer ${frontendJWT}`,
+            },
+        });
+
+        if (!response.ok) {
+            console.error('[API] Dify File Proxy - Error:', response.status, response.statusText);
+            return new Response(
+                JSON.stringify({ error: `文件下载失败: ${response.statusText}` }),
+                { status: response.status, headers: { 'Content-Type': 'application/json' } }
+            );
+        }
+
+        // 获取文件内容
+        const fileBuffer = await response.arrayBuffer();
+
+        // 返回文件，保持原始的 Content-Type
+        const contentType = response.headers.get('Content-Type') || 'application/octet-stream';
+        const contentDisposition = response.headers.get('Content-Disposition');
+
+        const headers: Record<string, string> = {
+            'Content-Type': contentType,
+        };
+
+        if (contentDisposition) {
+            headers['Content-Disposition'] = contentDisposition;
+        }
+
+        return new Response(fileBuffer, {
+            status: 200,
+            headers,
+        });
+
+    } catch (error: any) {
+        console.error('[API] Dify File Proxy - Error:', error.message);
+        return new Response(
+            JSON.stringify({ error: error.message || 'Failed to download file' }),
+            { status: 500, headers: { 'Content-Type': 'application/json' } }
+        );
+    }
+}