main.py

import os
import uvicorn
from fastapi import FastAPI, Request, HTTPException, status, WebSocketDisconnect
from fastapi.applications import AppType
from fastapi.responses import JSONResponse
from requests import Timeout, TooManyRedirects, RequestException, Session

from connection_manager import *
from request_forwarder_classes import *

PORT: int = int(os.getenv("PORT"))
PASSWORD: str = os.getenv("PASSWORD")

app: AppType = FastAPI()
connection_manager = ConnectionManager(PASSWORD)


def __get_response(forwarded_request: ForwardedRequest, session: Session | None = None) -> Tuple[int, Dict]:
    try:
        if not session:
            session = Session()
        response = session.request(
            forwarded_request.method,
            forwarded_request.url,
            headers=forwarded_request.headers,
            data=forwarded_request.data,
            params=forwarded_request.params,
            auth=forwarded_request.auth,
            cookies=forwarded_request.cookies,
            json=forwarded_request.json)
        forwarded_response = ForwardedResponse.from_response(response, forwarded_request.response_content_type)
        return status.HTTP_200_OK, {"response": forwarded_response.to_json_dict(), "error": None}
    except ConnectionError as e:
        return status.HTTP_418_IM_A_TEAPOT, {"response": None, "error": {"ConnectionError": str(e)}}
    except Timeout as e:
        return status.HTTP_418_IM_A_TEAPOT, {"response": None, "error": {"Timeout": str(e)}}
    except TooManyRedirects as e:
        return status.HTTP_418_IM_A_TEAPOT, {"response": None, "error": {"TooManyRedirects": str(e)}}
    except RequestException as e:
        return status.HTTP_418_IM_A_TEAPOT, {"response": None, "error": {"RequestException": str(e)}}
    except Exception as e:
        return status.HTTP_418_IM_A_TEAPOT, {"response": None, "error": str(e)}


@app.websocket("/ws/forward-requests")
async def websocket_endpoint(websocket: WebSocket):
    await connection_manager.connect(websocket)
    session = Session()
    try:
        while True:
            request = await websocket.receive_json()
            print(request)
            forwarded_request = ForwardedRequest.from_json(request)
            response_status, response = __get_response(forwarded_request, session)
            await websocket.send_json(response)
    except WebSocketDisconnect:
        connection_manager.disconnect(websocket)


@app.post("/forward-request")
async def forward_request(forwarded_request: ForwardedRequest, request: Request):
    authorization: str = request.headers.get("Authorization")
    if not authorization:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Authorization header missing")

    token_type, _, token = authorization.partition(' ')
    if token_type != "Bearer" or not token:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid authorization header format")

    if token != PASSWORD:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Invalid token")

    response_status, response = __get_response(forwarded_request)
    return JSONResponse(content=response, status_code=response_status)


if __name__ == '__main__':
    uvicorn.run("main:app", host="0.0.0.0", port=PORT)