main.py

from fastapi import FastAPI, Request, Response, HTTPException, Depends
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import StreamingResponse

import requests
import json
from pydantic import BaseModel

from apps.web.models.users import Users
from constants import ERROR_MESSAGES
from utils.utils import decode_token, get_current_user
from config import OLLAMA_API_BASE_URL, WEBUI_AUTH

app = FastAPI()
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

app.state.OLLAMA_API_BASE_URL = OLLAMA_API_BASE_URL

# TARGET_SERVER_URL = OLLAMA_API_BASE_URL


@app.get("/url")
async def get_ollama_api_url(user=Depends(get_current_user)):
    if user and user.role == "admin":
        return {"OLLAMA_API_BASE_URL": app.state.OLLAMA_API_BASE_URL}
    else:
        raise HTTPException(status_code=401,
                            detail=ERROR_MESSAGES.ACCESS_PROHIBITED)


class UrlUpdateForm(BaseModel):
    url: str


@app.post("/url/update")
async def update_ollama_api_url(form_data: UrlUpdateForm,
                                user=Depends(get_current_user)):
    if user and user.role == "admin":
        app.state.OLLAMA_API_BASE_URL = form_data.url
        return {"OLLAMA_API_BASE_URL": app.state.OLLAMA_API_BASE_URL}
    else:
        raise HTTPException(status_code=401,
                            detail=ERROR_MESSAGES.ACCESS_PROHIBITED)


@app.api_route("/{path:path}", methods=["GET", "POST", "PUT", "DELETE"])
async def proxy(path: str, request: Request, user=Depends(get_current_user)):
    target_url = f"{app.state.OLLAMA_API_BASE_URL}/{path}"

    body = await request.body()
    headers = dict(request.headers)

    if user.role in ["user", "admin"]:
        if path in ["pull", "delete", "push", "copy", "create"]:
            if user.role != "admin":
                raise HTTPException(status_code=401,
                                    detail=ERROR_MESSAGES.ACCESS_PROHIBITED)
    else:
        raise HTTPException(status_code=401,
                            detail=ERROR_MESSAGES.ACCESS_PROHIBITED)

    headers.pop("Host", None)
    headers.pop("Authorization", None)
    headers.pop("Origin", None)
    headers.pop("Referer", None)

    try:
        r = requests.request(
            method=request.method,
            url=target_url,
            data=body,
            headers=headers,
            stream=True,
        )

        r.raise_for_status()

        return StreamingResponse(
            r.iter_content(chunk_size=8192),
            status_code=r.status_code,
            headers=dict(r.headers),
        )
    except Exception as e:
        print(e)
        error_detail = "Ollama WebUI: Server Connection Error"
        if r is not None:
            try:
                res = r.json()
                if "error" in res:
                    error_detail = f"Ollama: {res['error']}"
            except:
                error_detail = f"Ollama: {e}"

        raise HTTPException(status_code=r.status_code, detail=error_detail)