auth.py

# Copyright 2017 IBM Corp. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
This module is used to perform the HTTP Basic Auth
"""

from functools import wraps
from flask import request, Response

__USERS = {'admin': 'time4fun', 'user1': 'user1'}

def check_auth(username, password):
    """
    Verify username and password
    """

    return __USERS.has_key(username) and password == __USERS[username]

def authenticate():
    """Sends a 401 response that enables basic auth"""
    return Response(
        'You have to login with proper credentials', 401,
        {'WWW-Authenticate': 'Basic realm="Login Required"'})

def requires_auth(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        auth = request.authorization
        if not auth or not check_auth(auth.username, auth.password):
            return authenticate()
        return f(*args, **kwargs)
    return decorated