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

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from flask import request, session, redirect, url_for, flash
from flask_login import login_user
from requests_oauthlib import OAuth2Session
from requests_oauthlib.compliance_fixes import facebook_compliance_fix
from app import email_utils
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from app.auth.base import auth_bp
from app.auth.views.google import create_file_from_url
from app.config import URL, FACEBOOK_CLIENT_ID, FACEBOOK_CLIENT_SECRET
from app.extensions import db
from app.log import LOG
from app.models import User
from .login_utils import after_login
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_authorization_base_url = "https://www.facebook.com/dialog/oauth"
_token_url = "https://graph.facebook.com/oauth/access_token"
_scope = ["email"]
# 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/facebook/callback"
@auth_bp.route("/facebook/login")
def facebook_login():
# to avoid flask-login displaying the login error message
session.pop("_flashes", None)
next_url = request.args.get("next")
# Facebook does not allow to append param to redirect_uri
# we need to pass the next url by session
if next_url:
session["facebook_next_url"] = next_url
facebook = OAuth2Session(
FACEBOOK_CLIENT_ID, scope=_scope, redirect_uri=_redirect_uri
)
facebook = facebook_compliance_fix(facebook)
authorization_url, state = facebook.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("/facebook/callback")
def facebook_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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facebook = OAuth2Session(
FACEBOOK_CLIENT_ID,
state=session["oauth_state"],
scope=_scope,
redirect_uri=_redirect_uri,
)
facebook = facebook_compliance_fix(facebook)
token = facebook.fetch_token(
_token_url,
client_secret=FACEBOOK_CLIENT_SECRET,
authorization_response=request.url,
)
# Fetch a protected resource, i.e. user profile
# {
# "email": "abcd@gmail.com",
# "id": "1234",
# "name": "First Last",
# "picture": {
# "data": {
# "url": "long_url"
# }
# }
# }
facebook_user_data = facebook.get(
"https://graph.facebook.com/me?fields=id,name,email,picture{url}"
).json()
email = facebook_user_data.get("email")
# user choose to not share email, cannot continue
if not email:
flash(
"In order to use SimpleLogin, you need to give us a valid email", "warning"
)
return redirect(url_for("auth.register"))
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user = User.get_by(email=email)
picture_url = facebook_user_data.get("picture", {}).get("data", {}).get("url")
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()
# create user
else:
LOG.d("create facebook user with %s", facebook_user_data)
user = User.create(email=email, name=facebook_user_data["name"], activated=True)
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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)
email_utils.send_welcome_email(user.email, user.name)
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flash(f"Welcome to SimpleLogin {user.name}!", "success")
next_url = None
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# The activation link contains the original page, for ex authorize page
if "facebook_next_url" in session:
next_url = session["facebook_next_url"]
LOG.debug("redirect user to %s", next_url)
# reset the next_url to avoid user getting redirected at each login :)
session.pop("facebook_next_url", None)
return after_login(user, next_url)