app-MAIL-temp/app/auth/views/google.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 import s3
from app.auth.base import auth_bp
from app.config import URL, GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET
from app.email_utils import notify_admin
from app.extensions import db
from app.log import LOG
from app.models import User, File
from app.utils import random_string
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_authorization_base_url = "https://accounts.google.com/o/oauth2/v2/auth"
_token_url = "https://www.googleapis.com/oauth2/v4/token"
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_scope = [
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"https://www.googleapis.com/auth/userinfo.email",
"https://www.googleapis.com/auth/userinfo.profile",
"openid",
]
# 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
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_redirect_uri = URL + "/auth/google/callback"
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@auth_bp.route("/google/login")
def google_login():
# to avoid flask-login displaying the login error message
session.pop("_flashes", None)
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next_url = request.args.get("next")
# Google does not allow to append param to redirect_url
# we need to pass the next url by session
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if next_url:
session["google_next_url"] = next_url
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google = OAuth2Session(GOOGLE_CLIENT_ID, scope=_scope, redirect_uri=_redirect_uri)
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authorization_url, state = google.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("/google/callback")
def google_callback():
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# user clicks on cancel
if "error" in request.args:
flash("please use another sign in method then", "warning")
return redirect("/")
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google = OAuth2Session(
GOOGLE_CLIENT_ID,
state=session["oauth_state"],
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scope=_scope,
redirect_uri=_redirect_uri,
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)
token = google.fetch_token(
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_token_url,
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client_secret=GOOGLE_CLIENT_SECRET,
authorization_response=request.url,
)
# Fetch a protected resource, i.e. user profile
# {
# "email": "abcd@gmail.com",
# "family_name": "First name",
# "given_name": "Last name",
# "id": "1234",
# "locale": "en",
# "name": "First Last",
# "picture": "http://profile.jpg",
# "verified_email": true
# }
google_user_data = google.get(
"https://www.googleapis.com/oauth2/v1/userinfo"
).json()
email = google_user_data["email"]
user = User.get_by(email=email)
picture_url = google_user_data.get("picture")
if user:
if picture_url and not user.profile_picture_id:
LOG.d("set user profile picture to %s", picture_url)
file = create_file_from_url(picture_url)
user.profile_picture_id = file.id
db.session.commit()
login_user(user)
# create user
else:
LOG.d("create google user with %s", google_user_data)
user = User.create(email=email, name=google_user_data["name"])
# set a random password
user.set_password(random_string(20))
user.activated = True
if picture_url:
LOG.d("set user profile picture to %s", picture_url)
file = create_file_from_url(picture_url)
user.profile_picture_id = file.id
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 "google_next_url" in session:
next_url = session["google_next_url"]
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LOG.debug("redirect user to %s", next_url)
# reset the next_url to avoid user getting redirected at each login :)
session.pop("google_next_url", None)
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return redirect(next_url)
else:
LOG.debug("redirect user to dashboard")
return redirect(url_for("dashboard.index"))
def create_file_from_url(url) -> File:
file_path = random_string(30)
file = File.create(path=file_path)
s3.upload_from_url(url, file_path)
db.session.flush()
LOG.d("upload file %s to s3", file)
return file