112 lines
3.5 KiB
Python
112 lines
3.5 KiB
Python
from flask import request, session, redirect, flash, url_for
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from flask_login import login_user
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from requests_oauthlib import OAuth2Session
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from app import email_utils
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from app.auth.base import auth_bp
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from app.auth.views.login_utils import after_login
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from app.config import GITHUB_CLIENT_ID, GITHUB_CLIENT_SECRET, URL, DISABLE_REGISTRATION
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from app.email_utils import can_be_used_as_personal_email
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from app.extensions import db
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from app.log import LOG
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from app.models import User
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from app.utils import encode_url
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_authorization_base_url = "https://github.com/login/oauth/authorize"
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_token_url = "https://github.com/login/oauth/access_token"
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# need to set explicitly redirect_uri instead of leaving the lib to pre-fill redirect_uri
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# when served behind nginx, the redirect_uri is localhost... and not the real url
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_redirect_uri = URL + "/auth/github/callback"
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@auth_bp.route("/github/login")
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def github_login():
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next_url = request.args.get("next")
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if next_url:
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redirect_uri = _redirect_uri + "?next=" + encode_url(next_url)
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else:
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redirect_uri = _redirect_uri
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github = OAuth2Session(
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GITHUB_CLIENT_ID, scope=["user:email"], redirect_uri=redirect_uri
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)
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authorization_url, state = github.authorization_url(_authorization_base_url)
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# State is used to prevent CSRF, keep this for later.
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session["oauth_state"] = state
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return redirect(authorization_url)
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@auth_bp.route("/github/callback")
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def github_callback():
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# user clicks on cancel
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if "error" in request.args:
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flash("Please use another sign in method then", "warning")
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return redirect("/")
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github = OAuth2Session(
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GITHUB_CLIENT_ID,
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state=session["oauth_state"],
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scope=["user:email"],
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redirect_uri=_redirect_uri,
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)
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token = github.fetch_token(
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_token_url,
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client_secret=GITHUB_CLIENT_SECRET,
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authorization_response=request.url,
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)
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# a dict with "name", "login"
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github_user_data = github.get("https://api.github.com/user").json()
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LOG.d("user login with github %s", github_user_data)
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# return list of emails
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# {
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# 'email': 'abcd@gmail.com',
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# 'primary': False,
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# 'verified': True,
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# 'visibility': None
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# }
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emails = github.get("https://api.github.com/user/emails").json()
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# only take the primary email
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email = None
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for e in emails:
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if e.get("verified") and e.get("primary"):
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email = e.get("email")
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break
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if not email:
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raise Exception("cannot get email for github user")
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user = User.get_by(email=email)
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# create user
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if not user:
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if DISABLE_REGISTRATION:
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flash("Registration is closed", "error")
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return redirect(url_for("auth.login"))
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if not can_be_used_as_personal_email(email):
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flash(
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f"You cannot use {email} as your personal inbox.", "error",
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)
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return redirect(url_for("auth.login"))
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LOG.d("create github user")
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user = User.create(
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email=email.lower(), name=github_user_data.get("name") or "", activated=True
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)
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db.session.commit()
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login_user(user)
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email_utils.send_welcome_email(user.email, user.name)
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flash(f"Welcome to SimpleLogin {user.name}!", "success")
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# The activation link contains the original page, for ex authorize page
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next_url = request.args.get("next") if request.args else None
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return after_login(user, next_url)
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