Initial project import

api/errors.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+from fastapi import FastAPI, Request
+from fastapi.encoders import jsonable_encoder
+from fastapi.exceptions import RequestValidationError
+from fastapi.responses import JSONResponse
+from starlette.exceptions import HTTPException as StarletteHTTPException
+
+from services.protocol.error_response import anthropic_error_response, openai_error_response
+
+
+def _is_openai_compatible_path(path: str) -> bool:
+    return path == "/v1" or path.startswith("/v1/")
+
+
+def _is_anthropic_messages_path(path: str) -> bool:
+    return path == "/v1/messages"
+
+
+def _compatible_error_response(
+    request: Request,
+    detail: object,
+    status_code: int,
+    headers: dict[str, str] | None = None,
+) -> JSONResponse:
+    if _is_anthropic_messages_path(request.url.path):
+        return anthropic_error_response(detail, status_code, headers=headers)
+    return openai_error_response(detail, status_code, headers=headers)
+
+
+def install_exception_handlers(app: FastAPI) -> None:
+    @app.exception_handler(StarletteHTTPException)
+    async def http_exception_handler(request: Request, exc: StarletteHTTPException) -> JSONResponse:
+        if _is_openai_compatible_path(request.url.path):
+            return _compatible_error_response(request, exc.detail, exc.status_code, exc.headers)
+        return JSONResponse(
+            status_code=exc.status_code,
+            content={"detail": jsonable_encoder(exc.detail)},
+            headers=exc.headers,
+        )
+
+    @app.exception_handler(RequestValidationError)
+    async def validation_exception_handler(request: Request, exc: RequestValidationError) -> JSONResponse:
+        if _is_openai_compatible_path(request.url.path):
+            return _compatible_error_response(request, exc.errors(), 422)
+        return JSONResponse(status_code=422, content={"detail": jsonable_encoder(exc.errors())})