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from fastapi import FastAPI, Request, Response
from fastapi.responses import HTMLResponse, RedirectResponse
from fastapi.templating import Jinja2Templates
from google.oauth2 import id_token
from google.auth.transport import requests as google_requests
from google_auth_oauthlib.flow import Flow
from chainlit.utils import mount_chainlit
import secrets
import json
import base64
from modules.config.constants import (
OAUTH_GOOGLE_CLIENT_ID,
OAUTH_GOOGLE_CLIENT_SECRET,
CHAINLIT_URL,
)
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
GOOGLE_CLIENT_ID = OAUTH_GOOGLE_CLIENT_ID
GOOGLE_CLIENT_SECRET = OAUTH_GOOGLE_CLIENT_SECRET
GOOGLE_REDIRECT_URI = f"{CHAINLIT_URL}/auth/oauth/google/callback"
app = FastAPI()
app.mount("/public", StaticFiles(directory="public"), name="public")
app.add_middleware(
CORSMiddleware,
allow_origins=["*"], # Update with appropriate origins
allow_methods=["*"],
allow_headers=["*"], # or specify the headers you want to allow
expose_headers=["X-User-Info"], # Expose the custom header
)
templates = Jinja2Templates(directory="templates")
session_store = {}
CHAINLIT_PATH = "/chainlit_tutor"
USER_ROLES = {
"[email protected]": ["instructor", "bu"],
"[email protected]": ["instructor", "bu"],
"[email protected]": ["instructor", "bu"],
"[email protected]": ["guest"],
# Add more users and roles as needed
}
# Create a Google OAuth flow
flow = Flow.from_client_config(
{
"web": {
"client_id": GOOGLE_CLIENT_ID,
"client_secret": GOOGLE_CLIENT_SECRET,
"auth_uri": "https://accounts.google.com/o/oauth2/auth",
"token_uri": "https://oauth2.googleapis.com/token",
"redirect_uris": [GOOGLE_REDIRECT_URI],
"scopes": [
"openid",
# "https://www.googleapis.com/auth/userinfo.email",
# "https://www.googleapis.com/auth/userinfo.profile",
],
}
},
scopes=[
"openid",
"https://www.googleapis.com/auth/userinfo.email",
"https://www.googleapis.com/auth/userinfo.profile",
],
redirect_uri=GOOGLE_REDIRECT_URI,
)
def get_user_role(username: str):
return USER_ROLES.get(username, ["student"]) # Default to "student" role
def get_user_info_from_cookie(request: Request):
user_info_encoded = request.cookies.get("X-User-Info")
if user_info_encoded:
try:
user_info_json = base64.b64decode(user_info_encoded).decode()
return json.loads(user_info_json)
except Exception as e:
print(f"Error decoding user info: {e}")
return None
return None
def get_user_info(request: Request):
session_token = request.cookies.get("session_token")
if session_token and session_token in session_store:
return session_store[session_token]
return None
@app.get("/", response_class=HTMLResponse)
async def login_page(request: Request):
user_info = get_user_info_from_cookie(request)
if user_info and user_info.get("google_signed_in"):
return RedirectResponse("/post-signin")
return templates.TemplateResponse("login.html", {"request": request})
@app.get("/login/guest")
@app.post("/login/guest")
async def login_guest():
username = "guest"
session_token = secrets.token_hex(16)
unique_session_id = secrets.token_hex(8)
username = f"{username}_{unique_session_id}"
session_store[session_token] = {
"email": username,
"name": "Guest",
"profile_image": "",
"google_signed_in": False, # Ensure guest users do not have this flag
}
user_info_json = json.dumps(session_store[session_token])
user_info_encoded = base64.b64encode(user_info_json.encode()).decode()
# Set cookies
response = RedirectResponse(url="/post-signin", status_code=303)
response.set_cookie(key="session_token", value=session_token)
response.set_cookie(key="X-User-Info", value=user_info_encoded, httponly=True)
return response
@app.get("/login/google")
async def login_google(request: Request):
# Clear any existing session cookies to avoid conflicts with guest sessions
response = RedirectResponse(url="/post-signin")
response.delete_cookie(key="session_token")
response.delete_cookie(key="X-User-Info")
user_info = get_user_info_from_cookie(request)
print(f"User info: {user_info}")
# Check if user is already signed in using Google
if user_info and user_info.get("google_signed_in"):
return RedirectResponse("/post-signin")
else:
authorization_url, _ = flow.authorization_url(prompt="consent")
return RedirectResponse(authorization_url, headers=response.headers)
@app.get("/auth/oauth/google/callback")
async def auth_google(request: Request):
try:
flow.fetch_token(code=request.query_params.get("code"))
credentials = flow.credentials
user_info = id_token.verify_oauth2_token(
credentials.id_token, google_requests.Request(), GOOGLE_CLIENT_ID
)
email = user_info["email"]
name = user_info.get("name", "")
profile_image = user_info.get("picture", "")
session_token = secrets.token_hex(16)
session_store[session_token] = {
"email": email,
"name": name,
"profile_image": profile_image,
"google_signed_in": True, # Set this flag to True for Google-signed users
}
user_info_json = json.dumps(session_store[session_token])
user_info_encoded = base64.b64encode(user_info_json.encode()).decode()
# Set cookies
response = RedirectResponse(url="/post-signin", status_code=303)
response.set_cookie(key="session_token", value=session_token)
response.set_cookie(key="X-User-Info", value=user_info_encoded, httponly=True)
return response
except Exception as e:
print(f"Error during Google OAuth callback: {e}")
return RedirectResponse(url="/", status_code=302)
@app.get("/post-signin", response_class=HTMLResponse)
async def post_signin(request: Request):
user_info = get_user_info_from_cookie(request)
if not user_info:
user_info = get_user_info(request)
# if user_info and user_info.get("google_signed_in"):
if user_info:
username = user_info["email"]
role = get_user_role(username)
jwt_token = request.cookies.get("X-User-Info")
return templates.TemplateResponse(
"dashboard.html",
{
"request": request,
"username": username,
"role": role,
"jwt_token": jwt_token,
},
)
return RedirectResponse("/")
@app.post("/start-tutor")
async def start_tutor(request: Request):
user_info = get_user_info_from_cookie(request)
if user_info:
user_info_json = json.dumps(user_info)
user_info_encoded = base64.b64encode(user_info_json.encode()).decode()
response = RedirectResponse(CHAINLIT_PATH, status_code=303)
response.set_cookie(key="X-User-Info", value=user_info_encoded, httponly=True)
return response
return RedirectResponse(url="/")
@app.exception_handler(Exception)
async def exception_handler(request: Request, exc: Exception):
return templates.TemplateResponse(
"error.html", {"request": request, "error": str(exc)}, status_code=500
)
@app.get("/chainlit_tutor/logout", response_class=HTMLResponse)
@app.post("/chainlit_tutor/logout", response_class=HTMLResponse)
async def app_logout(request: Request, response: Response):
# Clear session cookies
response.delete_cookie("session_token")
response.delete_cookie("X-User-Info")
print("logout_page called")
# Redirect to the logout page with embedded JavaScript
return RedirectResponse(url="/", status_code=302)
mount_chainlit(app=app, target="main.py", path=CHAINLIT_PATH)
if __name__ == "__main__":
import uvicorn
uvicorn.run(app, host="127.0.0.1", port=7860)
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