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

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2022-03-14 09:33:31 +01:00
from flask import request, session, redirect, flash, url_for
from flask_limiter.util import get_remote_address
from flask_login import current_user
from requests_oauthlib import OAuth2Session
from app.auth.base import auth_bp
from app.auth.views.login_utils import after_login
from app.config import (
PROTON_BASE_URL,
PROTON_CLIENT_ID,
PROTON_CLIENT_SECRET,
PROTON_VALIDATE_CERTS,
URL,
)
from app.proton.proton_client import HttpProtonClient, convert_access_token
from app.proton.proton_callback_handler import ProtonCallbackHandler, Action
from app.utils import encode_url, sanitize_next_url
_authorization_base_url = PROTON_BASE_URL + "/oauth/authorize"
_token_url = PROTON_BASE_URL + "/oauth/token"
# 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/proton/callback"
def extract_action() -> Action:
action = request.args.get("action")
if action is not None:
if action == "link":
return Action.Link
else:
raise Exception(f"Unknown action: {action}")
return Action.Login
def get_action_from_state() -> Action:
oauth_action = session["oauth_action"]
if oauth_action == Action.Login.value:
return Action.Login
elif oauth_action == Action.Link.value:
return Action.Link
raise Exception(f"Unknown action in state: {oauth_action}")
@auth_bp.route("/proton/login")
def proton_login():
if PROTON_CLIENT_ID is None or PROTON_CLIENT_SECRET is None:
return redirect(url_for("auth.login"))
next_url = sanitize_next_url(request.args.get("next"))
if next_url:
redirect_uri = _redirect_uri + "?next=" + encode_url(next_url)
else:
redirect_uri = _redirect_uri
proton = OAuth2Session(PROTON_CLIENT_ID, redirect_uri=redirect_uri)
authorization_url, state = proton.authorization_url(_authorization_base_url)
# State is used to prevent CSRF, keep this for later.
session["oauth_state"] = state
session["oauth_action"] = extract_action().value
return redirect(authorization_url)
@auth_bp.route("/proton/callback")
def proton_callback():
if PROTON_CLIENT_ID is None or PROTON_CLIENT_SECRET is None:
return redirect(url_for("auth.login"))
# user clicks on cancel
if "error" in request.args:
flash("Please use another sign in method then", "warning")
return redirect("/")
proton = OAuth2Session(
PROTON_CLIENT_ID,
state=session["oauth_state"],
redirect_uri=_redirect_uri,
)
token = proton.fetch_token(
_token_url,
client_secret=PROTON_CLIENT_SECRET,
authorization_response=request.url,
verify=PROTON_VALIDATE_CERTS,
method="GET",
include_client_id=True,
)
credentials = convert_access_token(token["access_token"])
action = get_action_from_state()
proton_client = HttpProtonClient(
PROTON_BASE_URL, credentials, get_remote_address(), verify=PROTON_VALIDATE_CERTS
)
handler = ProtonCallbackHandler(proton_client)
if action == Action.Login:
res = handler.handle_login()
elif action == Action.Link:
res = handler.handle_link(current_user)
else:
raise Exception(f"Unknown Action: {action.name}")
if res.flash_message is not None:
flash(res.flash_message, res.flash_category)
if res.redirect_to_login:
return redirect(url_for("auth.login"))
if res.redirect:
return redirect(res.redirect)
next_url = request.args.get("next") if request.args else None
return after_login(res.user, next_url)