import arrow from flask import request, session, redirect, url_for, flash from flask_login import login_user from requests_oauthlib import OAuth2Session from app.auth.base import auth_bp from app.config import GITHUB_CLIENT_ID, GITHUB_CLIENT_SECRET, URL from app.email_utils import notify_admin from app.extensions import db from app.log import LOG from app.models import User from app.utils import random_string authorization_base_url = "https://github.com/login/oauth/authorize" token_url = "https://github.com/login/oauth/access_token" # 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/github/callback" @auth_bp.route("/github/login") def github_login(): github = OAuth2Session( GITHUB_CLIENT_ID, scope=["user:email"], redirect_uri=redirect_uri ) authorization_url, state = github.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("/github/callback") def github_callback(): github = OAuth2Session( GITHUB_CLIENT_ID, state=session["oauth_state"], scope=["user:email"], redirect_uri=redirect_uri, ) token = github.fetch_token( token_url, client_secret=GITHUB_CLIENT_SECRET, authorization_response=request.url, ) # a dict with "name", "login" github_user_data = github.get("https://api.github.com/user").json() LOG.d("user login with github %s", github_user_data) # return list of emails # { # 'email': 'abcd@gmail.com', # 'primary': False, # 'verified': True, # 'visibility': None # } emails = github.get("https://api.github.com/user/emails").json() # only take the primary email email = None for e in emails: if e.get("verified") and e.get("primary"): email = e.get("email") break if not email: raise Exception("cannot get email for github user") user = User.get_by(email=email) if user: login_user(user) # create user else: LOG.d("create github user") user = User.create(email=email, name=github_user_data["name"]) # set a random password user.set_password(random_string(20)) user.activated = True db.session.commit() login_user(user) flash(f"Welcome to SimpleLogin {user.name}!", "success") notify_admin( f"new user signs up {user.email}", f"{user.name} signs up at {arrow.now()}" ) # The activation link contains the original page, for ex authorize page if "next" in request.args: next_url = request.args.get("next") LOG.debug("redirect user to %s", next_url) return redirect(next_url) else: LOG.debug("redirect user to dashboard") return redirect(url_for("dashboard.index"))