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"""Views for OAuth2 related functionality."""
import uuid
from datetime import datetime, timedelta
from urllib.parse import urljoin, urlparse, urlunparse
from authlib.jose import jwt
from flask import (
flash,
jsonify,
url_for,
request,
redirect,
Blueprint,
current_app as app)
from uploader import session
from uploader import monadic_requests as mrequests
from uploader.monadic_requests import make_error_handler
from . import jwks
from .client import (
SCOPE,
oauth2_get,
user_logged_in,
authserver_uri,
oauth2_clientid,
oauth2_clientsecret)
oauth2 = Blueprint("oauth2", __name__)
@oauth2.route("/code")
def authorisation_code():
"""Receive authorisation code from auth server and use it to get token."""
def __process_error__(resp_or_exception):
app.logger.debug("ERROR: (%s)", resp_or_exception)
flash("There was an error retrieving the authorisation token.",
"alert-danger")
return redirect("/")
def __fail_set_user_details__(_failure):
app.logger.debug("Fetching user details fails: %s", _failure)
flash("Could not retrieve the user details", "alert-danger")
return redirect("/")
def __success_set_user_details__(_success):
app.logger.debug("Session info: %s", _success)
return redirect("/")
def __success__(token):
session.set_user_token(token)
return oauth2_get("auth/user/").then(
lambda usrdets: session.set_user_details({
"user_id": uuid.UUID(usrdets["user_id"]),
"name": usrdets["name"],
"email": usrdets["email"],
"token": session.user_token(),
"logged_in": True})).either(
__fail_set_user_details__,
__success_set_user_details__)
code = request.args.get("code", "").strip()
if not bool(code):
flash("AuthorisationError: No code was provided.", "alert-danger")
return redirect("/")
baseurl = urlparse(request.base_url, scheme=request.scheme)
issued = datetime.now()
jwtkey = jwks.newest_jwk_with_rotation(
jwks.jwks_directory(app, "UPLOADER_SECRETS"),
int(app.config["JWKS_ROTATION_AGE_DAYS"]))
return mrequests.post(
urljoin(authserver_uri(), "auth/token"),
json={
"grant_type": "urn:ietf:params:oauth:grant-type:jwt-bearer",
"code": code,
"scope": SCOPE,
"redirect_uri": urljoin(
urlunparse(baseurl),
url_for("oauth2.authorisation_code")),
"assertion": jwt.encode(
header={
"alg": "RS256",
"typ": "JWT",
"kid": jwtkey.as_dict()["kid"]
},
payload={
"iss": str(oauth2_clientid()),
"sub": request.args["user_id"],
"aud": urljoin(authserver_uri(),"auth/token"),
"exp": (issued + timedelta(minutes=5)).timestamp(),
"nbf": int(issued.timestamp()),
"iat": int(issued.timestamp()),
"jti": str(uuid.uuid4())
},
key=jwtkey).decode("utf8"),
"client_id": oauth2_clientid()
}).either(__process_error__, __success__)
@oauth2.route("/public-jwks")
def public_jwks():
"""List the available JWKs"""
return jsonify({
"documentation": (
"The keys are listed in order of creation, from the oldest (first) "
"to the newest (last)."),
"jwks": tuple(key.as_dict() for key
in jwks.list_jwks(jwks.jwks_directory(
app, "UPLOADER_SECRETS")))
})
@oauth2.route("/logout", methods=["GET"])
def logout():
"""Log out of any active sessions."""
def __unset_session__(session_info):
_user = session_info["user"]
_user_str = f"{_user['name']} ({_user['email']})"
session.clear_session_info()
flash("Successfully logged out.", "alert-success")
return redirect("/")
if user_logged_in():
return session.user_token().then(
lambda _tok: mrequests.post(
urljoin(authserver_uri(), "auth/revoke"),
json={
"token": _tok,
"client_id": oauth2_clientid(),
"client_secret": oauth2_clientsecret()
})).either(
make_error_handler(
redirect_to=redirect("/"),
cleanup_thunk=lambda: __unset_session__(
session.session_info())),
lambda res: __unset_session__(session.session_info()))
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