from flask import request, session, redirect, flash from flask_login import login_user from requests_oauthlib import OAuth2Session from app import s3, email_utils from app.auth.base import auth_bp from app.config import URL, GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET from app.extensions import db from app.log import LOG from app.models import User, File from app.utils import random_string from .login_utils import after_login _authorization_base_url = "https://accounts.google.com/o/oauth2/v2/auth" _token_url = "https://www.googleapis.com/oauth2/v4/token" _scope = [ "https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/userinfo.profile", "openid", ] # need to set explicitly redirect_uri instead of leaving the lib to pre-fill redirect_uri # when served behind nginx, the redirect_uri is localhost... and not the real url _redirect_uri = URL + "/auth/google/callback" @auth_bp.route("/google/login") def google_login(): # to avoid flask-login displaying the login error message session.pop("_flashes", None) next_url = request.args.get("next") # Google does not allow to append param to redirect_url # we need to pass the next url by session if next_url: session["google_next_url"] = next_url google = OAuth2Session(GOOGLE_CLIENT_ID, scope=_scope, redirect_uri=_redirect_uri) authorization_url, state = google.authorization_url(_authorization_base_url) # State is used to prevent CSRF, keep this for later. session["oauth_state"] = state return redirect(authorization_url) @auth_bp.route("/google/callback") def google_callback(): # user clicks on cancel if "error" in request.args: flash("please use another sign in method then", "warning") return redirect("/") google = OAuth2Session( GOOGLE_CLIENT_ID, state=session["oauth_state"], scope=_scope, redirect_uri=_redirect_uri, ) token = google.fetch_token( _token_url, client_secret=GOOGLE_CLIENT_SECRET, authorization_response=request.url, ) # Fetch a protected resource, i.e. user profile # { # "email": "abcd@gmail.com", # "family_name": "First name", # "given_name": "Last name", # "id": "1234", # "locale": "en", # "name": "First Last", # "picture": "http://profile.jpg", # "verified_email": true # } google_user_data = google.get( "https://www.googleapis.com/oauth2/v1/userinfo" ).json() email = google_user_data["email"] user = User.get_by(email=email) picture_url = google_user_data.get("picture") if user: if picture_url and not user.profile_picture_id: LOG.d("set user profile picture to %s", picture_url) file = create_file_from_url(picture_url) user.profile_picture_id = file.id db.session.commit() # create user else: LOG.d("create google user with %s", google_user_data) user = User.create( email=email.lower(), name=google_user_data["name"], activated=True ) if picture_url: LOG.d("set user profile picture to %s", picture_url) file = create_file_from_url(picture_url) user.profile_picture_id = file.id db.session.commit() login_user(user) email_utils.send_welcome_email(user.email, user.name) flash(f"Welcome to SimpleLogin {user.name}!", "success") next_url = None # The activation link contains the original page, for ex authorize page if "google_next_url" in session: next_url = session["google_next_url"] LOG.debug("redirect user to %s", next_url) # reset the next_url to avoid user getting redirected at each login :) session.pop("google_next_url", None) return after_login(user, next_url) def create_file_from_url(url) -> File: file_path = random_string(30) file = File.create(path=file_path) s3.upload_from_url(url, file_path) db.session.flush() LOG.d("upload file %s to s3", file) return file