ScoDoc/app/auth/logic.py

# -*- coding: UTF-8 -*

"""app.auth.logic.py
"""
import http

import flask
from flask import current_app, g, redirect, request, url_for
from flask_httpauth import HTTPBasicAuth, HTTPTokenAuth
import flask_login

from app import db, login
from app.auth.models import User
from app.models.config import ScoDocSiteConfig
from app.scodoc.sco_utils import json_error

basic_auth = HTTPBasicAuth()
token_auth = HTTPTokenAuth()


@basic_auth.verify_password
def verify_password(username, password):
    """Verify password for this user
    Appelé lors d'une demande de jeton (normalement via la route /tokens)
    """
    user: User = User.query.filter_by(user_name=username).first()
    if user and user.check_password(password):
        g.current_user = user
        # note: est aussi basic_auth.current_user()
        return user


@basic_auth.error_handler
def basic_auth_error(status):
    "error response (401 for invalid auth.)"
    return json_error(status)


@login.user_loader
def load_user(uid: str) -> User:
    "flask-login: accès à un utilisateur"
    return db.session.get(User, int(uid))


@token_auth.verify_token
def verify_token(token) -> User:
    """Retrouve l'utilisateur à partir du jeton.
    Si la requête n'a pas de jeton, token == "".
    """
    user = User.check_token(token) if token else None
    if user is not None:
        flask_login.login_user(user)
    g.current_user = user
    return user


@token_auth.error_handler
def token_auth_error(status):
    "Réponse en cas d'erreur d'auth."
    return json_error(status)


@token_auth.get_user_roles
def get_user_roles(user):
    return user.roles


@login.request_loader
def load_user_from_request(req: flask.Request) -> User:
    """Custom Login using Request Loader"""
    # Try token
    try:
        auth_type, token = req.headers["Authorization"].split(None, 1)
    except (ValueError, KeyError):
        # The Authorization header is either empty or has no token
        return None
    if auth_type == "Bearer" and token:
        return verify_token(token)
    return None


@login.unauthorized_handler
def unauthorized():
    "flask-login: si pas autorisé, redirige vers page login, sauf si API"
    if request.blueprint == "api" or request.blueprint == "apiweb":
        return json_error(http.HTTPStatus.UNAUTHORIZED, "Non autorise (logic)")
    return redirect(url_for("auth.login"))


def logout() -> flask.Response:
    """Logout the current user: If CAS session, logout from CAS. Redirect."""
    if flask_login.current_user:
        user_name = getattr(flask_login.current_user, "user_name", "anonymous")
        current_app.logger.info(f"logout user {user_name}")
    flask_login.logout_user()
    if ScoDocSiteConfig.is_cas_enabled() and flask.session.get("scodoc_cas_login_date"):
        flask.session.pop("scodoc_cas_login_date", None)
        return redirect(url_for("cas.logout"))
    return redirect(url_for("scodoc.index"))