init(all)：一个让codex调用deepseek模型的项目

routers/middleware.py

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+"""
+中间件配置
+
+参照 PineSoundDesktop 项目结构集中管理中间件。
+"""
+
+import json
+
+from fastapi import Response
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.config import MODEL_MAP, DEFAULT_MODEL, MY_API_KEY
+
+
+def setup_middleware(app):
+    """配置所有中间件
+
+    Args:
+        app: FastAPI 应用实例
+    """
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=["*"],
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )
+
+    @app.middleware("http")
+    async def auth_check(request, call_next):
+        """验证请求携带的 API Key 是否合法"""
+        # OPTIONS 预检请求跳过验证
+        if request.method == "OPTIONS":
+            return await call_next(request)
+
+        auth = request.headers.get("Authorization", "")
+        if auth.startswith("Bearer "):
+            token = auth[7:]
+        else:
+            token = ""
+
+        if token != MY_API_KEY:
+            return Response(
+                content=json.dumps({
+                    "error": {"message": "Invalid API Key", "type": "auth_error"},
+                }),
+                status_code=401,
+                media_type="application/json",
+            )
+
+        return await call_next(request)
+
+    @app.middleware("http")
+    async def resolve_model(request, call_next):
+        """拦截请求中的模型名称，按 MODEL_MAP 进行替换"""
+        if request.method == "POST":
+            body = await request.body()
+            if body:
+                try:
+                    data = json.loads(body)
+                    original = data.get("model")
+                    if original:
+                        resolved = MODEL_MAP.get(original, DEFAULT_MODEL)
+                        request.state.resolved_model = resolved
+                except (json.JSONDecodeError, UnicodeDecodeError):
+                    pass
+        response = await call_next(request)
+        return response