from flask import request, session, redirect, flash, url_for from flask_login import login_user from requests_oauthlib import OAuth2Session from app import email_utils 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, DISABLE_REGISTRATION from app.email_utils import can_be_used_as_personal_email, email_already_used from app.extensions import db from app.log import LOG from app.models import User 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, ) 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"): email = e.get("email") break if not email: raise Exception("cannot get email for github user") user = User.get_by(email=email) # create user if not user: if DISABLE_REGISTRATION: flash("Registration is closed", "error") return redirect(url_for("auth.login")) if not can_be_used_as_personal_email(email) or email_already_used(email): flash( f"You cannot use {email} as your personal inbox.", "error", ) return redirect(url_for("auth.login")) LOG.d("create github user") user = User.create( email=email.lower(), name=github_user_data.get("name") or "", activated=True ) db.session.commit() login_user(user) email_utils.send_welcome_email(user) flash(f"Welcome to SimpleLogin {user.name}!", "success") # 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)