app-MAIL-temp/app/auth/views/github.py

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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
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from app.config import GITHUB_CLIENT_ID, GITHUB_CLIENT_SECRET, URL
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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, encode_url
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_authorization_base_url = "https://github.com/login/oauth/authorize"
_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
# when served behind nginx, the redirect_uri is localhost... and not the real url
_redirect_uri = URL + "/auth/github/callback"
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@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
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github = OAuth2Session(
GITHUB_CLIENT_ID, scope=["user:email"], redirect_uri=redirect_uri
)
authorization_url, state = github.authorization_url(_authorization_base_url)
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# 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(
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GITHUB_CLIENT_ID,
state=session["oauth_state"],
scope=["user:email"],
redirect_uri=_redirect_uri,
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)
token = github.fetch_token(
_token_url,
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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"))