from flask import request, session, redirect, flash, url_for from requests_oauthlib import OAuth2Session from app.auth.base import auth_bp from app.auth.views.login_utils import after_login from app.config import GITHUB_CLIENT_ID, GITHUB_CLIENT_SECRET, URL from app.extensions import db from app.log import LOG from app.models import User, SocialAuth from app.utils import encode_url _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(): next_url = request.args.get("next") if next_url: redirect_uri = _redirect_uri + "?next=" + encode_url(next_url) else: redirect_uri = _redirect_uri 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(): # user clicks on cancel if "error" in request.args: flash("Please use another sign in method then", "warning") return redirect("/") github = OAuth2Session( GITHUB_CLIENT_ID, state=session["oauth_state"], scope=["user:email"], redirect_uri=_redirect_uri, ) 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() # 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: LOG.exception(f"cannot get email for github user {github_user_data} {emails}") flash( "Cannot get a valid email from Github, please another way to login/sign up", "error", ) return redirect(url_for("auth.login")) email = email.strip().lower() user = User.get_by(email=email) if not user: flash( "Sorry you cannot sign up via Github, please use email/password sign-up instead", "error", ) return redirect(url_for("auth.register")) if not SocialAuth.get_by(user_id=user.id, social="github"): SocialAuth.create(user_id=user.id, social="github") db.session.commit() # The activation link contains the original page, for ex authorize page next_url = request.args.get("next") if request.args else None return after_login(user, next_url)