auth.py

import json
import os
from flask import request, _request_ctx_stack, abort
from functools import wraps
from jose import jwt
from urllib.request import urlopen

from werkzeug.datastructures import Authorization

AUTH0_DOMAIN = os.environ.get('AUTH0_DOMAIN')
ALGORITHMS = os.environ.get['ALGORITHMS']
API_AUDIENCE = os.environ.get('API_AUDIENCE')

'''
Generate new Token:

when running server localy:

https://fsnd-learning.eu.auth0.com/authorize?
audience=castingagency&
response_type=token&
client_id=k45gdNHT8UN58n5grMnUnOnd4WBJZLEL&
redirect_uri=http://127.0.0.1:5000/

when running in Heroku:

https://fsnd-learning.eu.auth0.com/authorize?
audience=castingagency&
response_type=token&
client_id=k45gdNHT8UN58n5grMnUnOnd4WBJZLEL&
redirect_uri=https://fsnd-capstone-bvf.herokuapp.com/

'''

# AuthError Exception


class AuthError(Exception):
    def __init__(self, error, status_code):
        self.error = error
        self.status_code = status_code

# Auth Header


def get_token_auth_header():
    auth = request.headers.get('Authorization', None)
    if not auth:
        raise AuthError({
            'code': 'authorization_header_missing',
            'description': 'Authorization header is expected.',
            'success': False
        }, 401)

    parts = auth.split()
    if parts[0].lower() != 'bearer':
        raise AuthError({
            'code': 'invalid_header',
            'description': 'Authorization header must start with "Bearer".',
            'success': False
        }, 401)
    elif len(parts) == 1:
        raise AuthError({
            'code': 'invalid_header',
            'description': 'Token not found',
            'success': False
        }, 401)

    elif len(parts) > 2:
        raise AuthError({
            'code': 'invalid_header',
            'description': 'Authorization header must be bearer token.',
            'success': False
        }, 401)

    token = parts[1]
    return token


def check_permissions(permission, payload):
    if 'permissions' not in payload:
        raise AuthError({
            'code': 'invalid_claims',
            'description': 'Permissions not included in JWT',
            'success': False
        }, 400)

    if permission not in payload['permissions']:
        raise AuthError({
            'code': 'unauthorized',
            'description': 'Permission not found',
            'success': False
        }, 401)

    return True


def verify_decode_jwt(token):
    jsonurl = urlopen(f'https://{AUTH0_DOMAIN}/.well-known/jwks.json')
    jwks = json.loads(jsonurl.read())
    unverified_header = jwt.get_unverified_header(token)
    rsa_key = {}
    if 'kid' not in unverified_header:
        raise AuthError({
            'code': 'invalid_header',
            'description': 'Authorization malformed.'
        }, 401)

    for key in jwks['keys']:
        if key['kid'] == unverified_header['kid']:
            rsa_key = {
                'kty': key['kty'],
                'kid': key['kid'],
                'use': key['use'],
                'n': key['n'],
                'e': key['e']
            }
    if rsa_key:
        try:
            payload = jwt.decode(
                token,
                rsa_key,
                algorithms=ALGORITHMS,
                audience=API_AUDIENCE,
                issuer='https://' + AUTH0_DOMAIN + '/'
            )

            return payload

        except jwt.ExpiredSignatureError:
            raise AuthError({
                'code': 'token_expired',
                'description': 'Token expired.'
            }, 401)

        except jwt.JWTClaimsError:
            raise AuthError({
                'code': 'invalid_claims',
                'description': 'Incorrect claims.\
                                Please, check the audience and issuer.'
            }, 401)

        except Exception:
            raise AuthError({
                'code': 'invalid_header',
                'description': 'Unable to parse authentication token.'
            }, 400)

    raise AuthError({
        'code': 'invalid_header',
        'description': 'Unable to find the appropriate key.'
    }, 400)


def requires_auth(permission=''):
    def requires_auth_decorator(f):
        @wraps(f)
        def wrapper(*args, **kwargs):
            token = get_token_auth_header()
            try:
                payload = verify_decode_jwt(token)
            except IndexError:
                abort(401)

            check_permissions(permission, payload)

            return f(payload, *args, **kwargs)
        return wrapper
    return requires_auth_decorator