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from __future__ import annotations
import logging
import json
import uvicorn
import secrets
from fastapi import FastAPI, Response, Request
from fastapi.responses import StreamingResponse, RedirectResponse, HTMLResponse, JSONResponse
from fastapi.exceptions import RequestValidationError
from fastapi.security import APIKeyHeader
from starlette.exceptions import HTTPException
from starlette.status import HTTP_422_UNPROCESSABLE_ENTITY, HTTP_401_UNAUTHORIZED, HTTP_403_FORBIDDEN
from fastapi.encoders import jsonable_encoder
from pydantic import BaseModel
from typing import Union, Optional
import g4f
import g4f.debug
from g4f.client import AsyncClient
from g4f.typing import Messages
def create_app(g4f_api_key:str = None):
app = FastAPI()
api = Api(app, g4f_api_key=g4f_api_key)
api.register_routes()
api.register_authorization()
api.register_validation_exception_handler()
return app
class ChatCompletionsConfig(BaseModel):
messages: Messages
model: str
provider: Optional[str] = None
stream: bool = False
temperature: Optional[float] = None
max_tokens: Optional[int] = None
stop: Union[list[str], str, None] = None
api_key: Optional[str] = None
web_search: Optional[bool] = None
proxy: Optional[str] = None
list_ignored_providers: list[str] = None
def set_list_ignored_providers(ignored: list[str]):
global list_ignored_providers
list_ignored_providers = ignored
class Api:
def __init__(self, app: FastAPI, g4f_api_key=None) -> None:
self.app = app
self.client = AsyncClient()
self.g4f_api_key = g4f_api_key
self.get_g4f_api_key = APIKeyHeader(name="g4f-api-key")
def register_authorization(self):
@self.app.middleware("http")
async def authorization(request: Request, call_next):
if self.g4f_api_key and request.url.path in ["/v1/chat/completions", "/v1/completions"]:
try:
user_g4f_api_key = await self.get_g4f_api_key(request)
except HTTPException as e:
if e.status_code == 403:
return JSONResponse(
status_code=HTTP_401_UNAUTHORIZED,
content=jsonable_encoder({"detail": "G4F API key required"}),
)
if not secrets.compare_digest(self.g4f_api_key, user_g4f_api_key):
return JSONResponse(
status_code=HTTP_403_FORBIDDEN,
content=jsonable_encoder({"detail": "Invalid G4F API key"}),
)
response = await call_next(request)
return response
def register_validation_exception_handler(self):
@self.app.exception_handler(RequestValidationError)
async def validation_exception_handler(request: Request, exc: RequestValidationError):
details = exc.errors()
modified_details = []
for error in details:
modified_details.append({
"loc": error["loc"],
"message": error["msg"],
"type": error["type"],
})
return JSONResponse(
status_code=HTTP_422_UNPROCESSABLE_ENTITY,
content=jsonable_encoder({"detail": modified_details}),
)
def register_routes(self):
@self.app.get("/")
async def read_root():
return RedirectResponse("/v1", 302)
@self.app.get("/v1")
async def read_root_v1():
return HTMLResponse('g4f API: Go to '
'<a href="/v1/chat/completions">chat/completions</a> '
'or <a href="/v1/models">models</a>.')
@self.app.get("/v1/models")
async def models():
model_list = dict(
(model, g4f.models.ModelUtils.convert[model])
for model in g4f.Model.__all__()
)
model_list = [{
'id': model_id,
'object': 'model',
'created': 0,
'owned_by': model.base_provider
} for model_id, model in model_list.items()]
return JSONResponse(model_list)
@self.app.get("/v1/models/{model_name}")
async def model_info(model_name: str):
try:
model_info = g4f.models.ModelUtils.convert[model_name]
return JSONResponse({
'id': model_name,
'object': 'model',
'created': 0,
'owned_by': model_info.base_provider
})
except:
return JSONResponse({"error": "The model does not exist."})
@self.app.post("/v1/chat/completions")
async def chat_completions(config: ChatCompletionsConfig, request: Request = None, provider: str = None):
try:
config.provider = provider if config.provider is None else config.provider
if config.api_key is None and request is not None:
auth_header = request.headers.get("Authorization")
if auth_header is not None:
auth_header = auth_header.split(None, 1)[-1]
if auth_header and auth_header != "Bearer":
config.api_key = auth_header
response = self.client.chat.completions.create(
**config.dict(exclude_none=True),
ignored=list_ignored_providers
)
except Exception as e:
logging.exception(e)
return Response(content=format_exception(e, config), status_code=500, media_type="application/json")
if not config.stream:
return JSONResponse((await response).to_json())
async def streaming():
try:
async for chunk in response:
yield f"data: {json.dumps(chunk.to_json())}\n\n"
except GeneratorExit:
pass
except Exception as e:
logging.exception(e)
yield f'data: {format_exception(e, config)}\n\n'
yield "data: [DONE]\n\n"
return StreamingResponse(streaming(), media_type="text/event-stream")
@self.app.post("/v1/completions")
async def completions():
return Response(content=json.dumps({'info': 'Not working yet.'}, indent=4), media_type="application/json")
def format_exception(e: Exception, config: ChatCompletionsConfig) -> str:
last_provider = g4f.get_last_provider(True)
return json.dumps({
"error": {"message": f"{e.__class__.__name__}: {e}"},
"model": last_provider.get("model") if last_provider else config.model,
"provider": last_provider.get("name") if last_provider else config.provider
})
def run_api(
host: str = '0.0.0.0',
port: int = 1337,
bind: str = None,
debug: bool = False,
workers: int = None,
use_colors: bool = None,
g4f_api_key: str = None
) -> None:
print(f'Starting server... [g4f v-{g4f.version.utils.current_version}]' + (" (debug)" if debug else ""))
if use_colors is None:
use_colors = debug
if bind is not None:
host, port = bind.split(":")
if debug:
g4f.debug.logging = True
uvicorn.run(create_app(g4f_api_key), host=host, port=int(port), workers=workers, use_colors=use_colors)
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