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

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from flask import request, session, redirect, flash, url_for
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from requests_oauthlib import OAuth2Session
from app.auth.base import auth_bp
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from app.auth.views.login_utils import after_login
from app.config import GITHUB_CLIENT_ID, GITHUB_CLIENT_SECRET, URL
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from app.extensions import db
from app.log import LOG
from app.models import User, SocialAuth
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from app.utils import 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():
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# user clicks on cancel
if "error" in request.args:
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,
state=session["oauth_state"],
scope=["user:email"],
redirect_uri=_redirect_uri,
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)
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()
# 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"):
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email = e.get("email")
break
if not email:
LOG.error(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"))
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email = email.strip().lower()
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user = User.get_by(email=email)
if not user:
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flash(
"Sorry you cannot sign up via Github, please use email/password sign-up instead",
"error",
)
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return redirect(url_for("auth.register"))
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if not SocialAuth.get_by(user_id=user.id, social="github"):
SocialAuth.create(user_id=user.id, social="github")
db.session.commit()
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# 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)