"""Ensure credentials are preserved through the authorization.

The Authorization Code Grant will need to preserve state as well as redirect
uri and the Implicit Grant will need to preserve state.
"""
import json

from unittest import mock

from oauthlib.oauth2 import (MobileApplicationServer, RequestValidator,
                             WebApplicationServer)
from oauthlib.oauth2.rfc6749 import errors

from ....unittest import TestCase
from .test_utils import get_fragment_credentials, get_query_credentials


class PreservationTest(TestCase):

    DEFAULT_REDIRECT_URI = 'http://i.b./path'

    def setUp(self):
        self.validator = mock.MagicMock(spec=RequestValidator)
        self.validator.get_default_redirect_uri.return_value = self.DEFAULT_REDIRECT_URI
        self.validator.get_code_challenge.return_value = None
        self.validator.authenticate_client.side_effect = self.set_client
        self.web = WebApplicationServer(self.validator)
        self.mobile = MobileApplicationServer(self.validator)

    def set_client(self, request):
        request.client = mock.MagicMock()
        request.client.client_id = 'mocked'
        return True

    def test_state_preservation(self):
        auth_uri = 'http://example.com/path?state=xyz&client_id=abc&response_type='

        # authorization grant
        h, _, s = self.web.create_authorization_response(
                auth_uri + 'code', scopes=['random'])
        self.assertEqual(s, 302)
        self.assertIn('Location', h)
        self.assertEqual(get_query_credentials(h['Location'])['state'][0], 'xyz')

        # implicit grant
        h, _, s = self.mobile.create_authorization_response(
                auth_uri + 'token', scopes=['random'])
        self.assertEqual(s, 302)
        self.assertIn('Location', h)
        self.assertEqual(get_fragment_credentials(h['Location'])['state'][0], 'xyz')

    def test_redirect_uri_preservation(self):
        auth_uri = 'http://example.com/path?redirect_uri=http%3A%2F%2Fi.b%2Fpath&client_id=abc'
        redirect_uri = 'http://i.b/path'
        token_uri = 'http://example.com/path'

        # authorization grant
        h, _, s = self.web.create_authorization_response(
                auth_uri + '&response_type=code', scopes=['random'])
        self.assertEqual(s, 302)
        self.assertIn('Location', h)
        self.assertTrue(h['Location'].startswith(redirect_uri))

        # confirm_redirect_uri should return false if the redirect uri
        # was given in the authorization but not in the token request.
        self.validator.confirm_redirect_uri.return_value = False
        code = get_query_credentials(h['Location'])['code'][0]
        _, body, _ = self.web.create_token_response(token_uri,
                body='grant_type=authorization_code&code=%s' % code)
        self.assertEqual(json.loads(body)['error'], 'invalid_request')

        # implicit grant
        h, _, s = self.mobile.create_authorization_response(
                auth_uri + '&response_type=token', scopes=['random'])
        self.assertEqual(s, 302)
        self.assertIn('Location', h)
        self.assertTrue(h['Location'].startswith(redirect_uri))

    def test_invalid_redirect_uri(self):
        auth_uri = 'http://example.com/path?redirect_uri=http%3A%2F%2Fi.b%2Fpath&client_id=abc'
        self.validator.validate_redirect_uri.return_value = False

        # authorization grant
        self.assertRaises(errors.MismatchingRedirectURIError,
                self.web.create_authorization_response,
                auth_uri + '&response_type=code', scopes=['random'])

        # implicit grant
        self.assertRaises(errors.MismatchingRedirectURIError,
                self.mobile.create_authorization_response,
                auth_uri + '&response_type=token', scopes=['random'])

    def test_default_uri(self):
        auth_uri = 'http://example.com/path?state=xyz&client_id=abc'

        self.validator.get_default_redirect_uri.return_value = None

        # authorization grant
        self.assertRaises(errors.MissingRedirectURIError,
                self.web.create_authorization_response,
                auth_uri + '&response_type=code', scopes=['random'])

        # implicit grant
        self.assertRaises(errors.MissingRedirectURIError,
                self.mobile.create_authorization_response,
                auth_uri + '&response_type=token', scopes=['random'])

    def test_default_uri_in_token(self):
        auth_uri = 'http://example.com/path?state=xyz&client_id=abc'
        token_uri = 'http://example.com/path'

        # authorization grant
        h, _, s = self.web.create_authorization_response(
                auth_uri + '&response_type=code', scopes=['random'])
        self.assertEqual(s, 302)
        self.assertIn('Location', h)
        self.assertTrue(h['Location'].startswith(self.DEFAULT_REDIRECT_URI))

        # confirm_redirect_uri should return true if the redirect uri
        # was not given in the authorization AND not in the token request.
        self.validator.confirm_redirect_uri.return_value = True
        code = get_query_credentials(h['Location'])['code'][0]
        self.validator.validate_code.return_value = True
        _, body, s = self.web.create_token_response(token_uri,
                body='grant_type=authorization_code&code=%s' % code)
        self.assertEqual(s, 200)
        self.assertEqual(self.validator.confirm_redirect_uri.call_args[0][2], self.DEFAULT_REDIRECT_URI)