feat: /api/chat 转发到后端、fix：替换过期的key

Author: TinyAlmond

app/api/chat/route.ts

@@ -29,13 +29,59 @@ interface ChatRequest {
 import { resolveUserId } from "@/lib/server-auth";
 
 export async function POST(req: Request) {
+  // 1. 克隆请求，因为如果代理失败，后面的代码还需要读取 req.json()
+  const proxyReq = req.clone();
+
+  // ====== 尝试优雅降级代理到 Java 后端 ======
+  try {
+    const backendUrl = process.env.BACKEND_URL ?? "http://localhost:8080";
+    const controller = new AbortController();
+    const timeoutId = setTimeout(() => controller.abort(), 5000); // 5秒超时
+
+    // 原封不动把前端的参数丢给 Java
+    const proxyRes = await fetch(`${backendUrl}/openai/responses/stream`, {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+        "x-satoken": req.headers.get("x-satoken") || "",
+      },
+      body: await proxyReq.text(),
+      signal: controller.signal,
+    });
+
+    clearTimeout(timeoutId);
+
+    // 如果 Java 后端返回成功，则直接把它的流传回浏览器，提前结束
+    if (proxyRes.ok && proxyRes.body) {
+      console.log(
+        "[Chat Fallback Proxy] 🚀 Java Backend responded successfully. Piping stream...",
+      );
+      return new Response(proxyRes.body, {
+        headers: {
+          "Content-Type":
+            proxyRes.headers.get("Content-Type") || "text/plain; charset=utf-8",
+        },
+      });
+    } else {
+      console.warn(
+        `[Chat Fallback Proxy] ⚠️ Java Backend returned status: ${proxyRes.status}, fallback to local Next.js inference.`,
+      );
+    }
+  } catch (error) {
+    console.warn(
+      `[Chat Fallback Proxy] ❌ Java Backend unavailable or timed out, fallback to local Next.js inference. Error:`,
+      error,
+    );
+  }
+  // ====== 代理失败，继续往下走，启用备选方案（本地直连 AI）======
+
   try {
     // 先把 body 消费掉，再并行验证用户身份
     const {
       messages,
       system,
       pageContext,
-      provider = "intern", // 默认使用书生模型
+      provider = "deepseek", // 默认使用deepseek模型
       apiKey,
       chatId,
     }: ChatRequest = await req.json();

app/api/suggestions/route.ts

@@ -24,7 +24,7 @@ export async function POST(req: Request) {
     const {
       messages,
       pageContext,
-      provider = "intern",
+      provider = "deepseek",
       apiKey,
     }: SuggestionsRequest = await req.json();
 
@@ -38,17 +38,17 @@ export async function POST(req: Request) {
 
     // 模型选择策略：
     // - 若用户选了自己的 Provider（openai/gemini），用用户的模型
-    // - 否则（默认 intern）优先用 GLM-4-Flash（免费且快速），若 ZHIPU_API_KEY 未配置则回退到 intern
+    // - 否则（默认 deepseek）优先用 GLM-4-Flash（免费且快速），若 ZHIPU_API_KEY 未配置则回退到 deepseek
     let model;
-    if (provider !== "intern") {
+    if (provider !== "deepseek") {
       // 用户自选模型（openai / gemini）
       model = getModel(provider, apiKey);
     } else if (process.env.ZHIPU_API_KEY) {
       // 默认使用智谱 GLM-4-Flash（免费轻量）
       model = createGlmFlashModel();
     } else {
-      // 兜底：仍使用 intern
-      model = getModel("intern");
+      // 兜底：仍使用 deepseek
+      model = getModel("deepseek");
     }
 
     const isWelcomeRequest = messages.length === 0;
@@ -92,12 +92,12 @@ export async function POST(req: Request) {
       async (cPrompt: string, cModelId: string) => {
         // 由于 model 不能序列化传入，在缓存函数内侧由于无法动态构建，所以此处传递标识再创建
         const m =
-          cModelId === "intern"
-            ? getModel("intern")
+          cModelId === "deepseek"
+            ? getModel("deepseek")
             : cModelId === "glm"
               ? createGlmFlashModel()
               : // 无法传递用户动态 key，对于配置了 key 的情况不走此函数
-                getModel("intern");
+                getModel("deepseek");
 
         const { text } = await generateText({
           model: m,
@@ -115,7 +115,7 @@ export async function POST(req: Request) {
 
     let text = "";
     // 判断是否可以使用缓存（如果使用了自定义 apiKey，为了防止数据交叉，不采用公用缓存）
-    if (provider !== "intern" && !process.env.ZHIPU_API_KEY) {
+    if (provider !== "deepseek" && !process.env.ZHIPU_API_KEY) {
       const { text: directText } = await generateText({
         model,
         prompt,
@@ -124,11 +124,11 @@ export async function POST(req: Request) {
     } else {
       // 确定内部用于缓存匹配的模型标识
       const internalModelId =
-        provider === "intern"
+        provider === "deepseek"
           ? process.env.ZHIPU_API_KEY
             ? "glm"
-            : "intern"
-          : "intern";
+            : "deepseek"
+          : "deepseek";
       // 将缓存粒度关联到请求本身的内容上
       const suggestionKey = isWelcomeRequest
         ? `welcome-${pageContext?.slug || "default"}`

app/components/DocsAssistant.tsx

@@ -365,7 +365,7 @@ interface AssistantErrorState {
   showSettingsCTA: boolean;
 }
 
-type AssistantProvider = "openai" | "gemini" | "intern";
+type AssistantProvider = "openai" | "gemini" | "deepseek";
 
 type AssistantErrorData = {
   error?: string;
@@ -392,8 +392,8 @@ function deriveAssistantError(
   const providerLabel =
     provider === "gemini"
       ? "Google Gemini"
-      : provider === "intern"
-        ? "Intern-AI"
+      : provider === "deepseek"
+        ? "Deepseek"
         : "OpenAI";
   const fallback: AssistantErrorState = {
     message:
@@ -441,7 +441,7 @@ function deriveAssistantError(
   // For intern provider, don't show settings CTA for API key related errors
   // 对于书生，不要显示 API 密钥相关的错误
   if (
-    provider !== "intern" &&
+    provider !== "deepseek" &&
     (statusCode === 400 ||
       statusCode === 401 ||
       statusCode === 403 ||

app/components/assistant-ui/SettingsDialog.tsx

@@ -53,12 +53,12 @@ export const SettingsDialog = ({
             <RadioGroup
               value={provider}
               onValueChange={(value) =>
-                setProvider(value as "openai" | "gemini" | "intern")
+                setProvider(value as "openai" | "gemini" | "deepseek")
               }
             >
               <div className="flex items-center space-x-2">
-                <RadioGroupItem value="intern" id="intern" />
-                <Label htmlFor="intern">InternS1 (Free)</Label>
+                <RadioGroupItem value="deepseek" id="deepseek" />
+                <Label htmlFor="deepseek">Deepseek (Free)</Label>
               </div>
               <div className="flex items-center space-x-2">
                 <RadioGroupItem value="openai" id="openai" />
@@ -175,7 +175,7 @@ export const SettingsDialog = ({
             </div>
           )}
 
-          {provider === "intern" && (
+          {provider === "deepseek" && (
             <div className="space-y-2">
               <div className="text-sm text-muted-foreground">
                 感谢上海AILab的书生大模型对本项目的算力支持，Intern-AI

app/components/assistant-ui/thread.tsx

@@ -350,12 +350,12 @@ const Composer: FC<ComposerProps> = ({
       : provider === "gemini"
         ? geminiApiKey
         : "";
-  const hasActiveKey = provider === "intern" || activeKey.trim().length > 0;
+  const hasActiveKey = provider === "deepseek" || activeKey.trim().length > 0;
   const providerLabel =
     provider === "gemini"
       ? "Google Gemini"
-      : provider === "intern"
-        ? "Intern-AI"
+      : provider === "deepseek"
+        ? "Deepseek"
         : "OpenAI";
 
   const handleOpenSettings = useCallback(() => {

app/hooks/useAssistantSettings.tsx

@@ -10,7 +10,7 @@ import {
 } from "react";
 import type { ReactNode } from "react";
 
-type Provider = "openai" | "gemini" | "intern";
+type Provider = "openai" | "gemini" | "deepseek";
 
 interface AssistantSettingsState {
   provider: Provider;
@@ -30,7 +30,7 @@ interface AssistantSettingsContextValue extends AssistantSettingsState {
 const SETTINGS_KEY = "assistant-settings-storage";
 
 const defaultSettings: AssistantSettingsState = {
-  provider: "intern",
+  provider: "deepseek",
   openaiApiKey: "",
   geminiApiKey: "",
   saveToLocalStorage: false,
@@ -52,8 +52,8 @@ const parseStoredSettings = (raw: string | null): AssistantSettingsState => {
     let provider =
       parsed.provider === "gemini"
         ? "gemini"
-        : parsed.provider === "intern"
-          ? "intern"
+        : parsed.provider === "deepseek"
+          ? "deepseek"
           : "openai";
 
     const openaiApiKey =
@@ -67,10 +67,10 @@ const parseStoredSettings = (raw: string | null): AssistantSettingsState => {
 
     // 如果用户之前默认在 openai/gemini 但现在没有对应的 API Key，则回退到免配置的 intern 模型
     if (provider === "openai" && !openaiApiKey) {
-      provider = "intern";
+      provider = "deepseek";
     }
     if (provider === "gemini" && !geminiApiKey) {
-      provider = "intern";
+      provider = "deepseek";
     }
 
     return {

lib/ai/models.ts

@@ -1,8 +1,9 @@
 import { createOpenAIModel } from "./providers/openai";
 import { createGeminiModel } from "./providers/gemini";
 import { createInternModel } from "./providers/intern";
+import { createDeepseekModel } from "./providers/deepseek";
 
-export type AIProvider = "openai" | "gemini" | "intern";
+export type AIProvider = "openai" | "gemini" | "intern" | "deepseek";
 
 /**
  * Model工厂 用于返回对应的 AI 模型实例
@@ -28,6 +29,9 @@ export function getModel(provider: AIProvider, apiKey?: string) {
       // Intern 书生模型不需要用户提供 API key
       return createInternModel();
 
+    case "deepseek":
+      return createDeepseekModel();
+
     default:
       throw new Error(`Unsupported AI provider: ${provider}`);
   }
@@ -39,5 +43,5 @@ export function getModel(provider: AIProvider, apiKey?: string) {
  * @returns 如果需要 API key，返回 true，否则返回 false
  */
 export function requiresApiKey(provider: AIProvider): boolean {
-  return provider !== "intern";
+  return provider !== "intern" && provider !== "deepseek";
 }

lib/ai/providers/deepseek.ts

@@ -0,0 +1,18 @@
+import { createOpenAICompatible } from "@ai-sdk/openai-compatible";
+
+/**
+ * Create Deepseek AI model instance
+ * Uses environment variable DEEPSEEK_API_KEY for API key
+ * @returns Configured Deepseek model instance
+ */
+export function createDeepseekModel() {
+  const deepseek = createOpenAICompatible({
+    name: "deepseek",
+    baseURL: "https://api.deepseek.com/v1", // Some compatible SDKs expect /v1
+    headers: {
+      Authorization: `Bearer ${process.env.DEEPSEEK_API_KEY}`,
+    },
+  });
+
+  return deepseek("deepseek-chat");
+}