# Copyright 2012 OpenStack Foundation
#
# 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
#
#      http://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.

import base64
import hashlib
import hmac
import http.client
import uuid

from keystone.api import s3tokens
from keystone.common import provider_api
from keystone import exception
from keystone.tests import unit
from keystone.tests.unit import test_v3

PROVIDERS = provider_api.ProviderAPIs


class S3ContribCore(test_v3.RestfulTestCase):
    def setUp(self):
        super().setUp()

        self.load_backends()

        self.cred_blob, self.credential = unit.new_ec2_credential(
            self.user['id'], self.project_id
        )
        PROVIDERS.credential_api.create_credential(
            self.credential['id'], self.credential
        )
        # Cert credential so that we can test when type != ec2
        self.cert_blob, self.cert_cred = unit.new_cert_credential(
            self.user['id'], self.project_id
        )
        PROVIDERS.credential_api.create_credential(
            self.cert_cred['id'], self.cert_cred
        )

    def test_http_get_method_not_allowed(self):
        resp = self.get(
            '/s3tokens',
            expected_status=http.client.METHOD_NOT_ALLOWED,
            convert=False,
        )
        self.assertEqual(http.client.METHOD_NOT_ALLOWED, resp.status_code)

    def _test_good_response(self, expected_status=http.client.OK, **kwargs):
        sts = 'string to sign'  # opaque string from swift3
        sig = hmac.new(
            self.cred_blob['secret'].encode('ascii'),
            sts.encode('ascii'),
            hashlib.sha1,
        ).digest()
        resp = self.post(
            '/s3tokens',
            body={
                'credentials': {
                    'access': self.cred_blob['access'],
                    'signature': base64.b64encode(sig).strip(),
                    'token': base64.b64encode(sts.encode('ascii')).strip(),
                }
            },
            expected_status=expected_status,
            **kwargs,
        )
        if expected_status == http.client.OK:
            self.assertValidProjectScopedTokenResponse(
                resp, self.user, forbid_token_id=True
            )
        else:
            self.assertValidErrorResponse(resp)

    def test_good_response(self):
        self._test_good_response()

    def test_good_response_noauth(self):
        # s3tokens now requires service/admin auth; unauthenticated should be denied
        self._test_good_response(http.client.UNAUTHORIZED, noauth=True)

    def test_bad_request(self):
        self.post(
            '/s3tokens', body={}, expected_status=http.client.BAD_REQUEST
        )

        self.post(
            '/s3tokens',
            body="not json",
            expected_status=http.client.BAD_REQUEST,
        )

        self.post('/s3tokens', expected_status=http.client.BAD_REQUEST)

    def test_bad_response(self):
        self.post(
            '/s3tokens',
            body={
                'credentials': {
                    'access': self.cred_blob['access'],
                    'signature': base64.b64encode(
                        b'totally not the sig'
                    ).strip(),
                    'token': base64.b64encode(b'string to sign').strip(),
                }
            },
            expected_status=http.client.UNAUTHORIZED,
        )

    def test_bad_credential_type(self):
        self.post(
            '/s3tokens',
            body={
                'credentials': {
                    'access': self.cert_blob['access'],
                    'signature': base64.b64encode(
                        b'totally not the sig'
                    ).strip(),
                    'token': base64.b64encode(b'string to sign').strip(),
                }
            },
            expected_status=http.client.NOT_FOUND,
        )

    def test_nonexistent_access_key(self):
        self.post(
            '/s3tokens',
            body={
                'credentials': {
                    'access': 'somelongaccesskeythatdoesnotexist',
                    'signature': base64.b64encode(
                        b'totally not the sig'
                    ).strip(),
                    'token': base64.b64encode(b'string to sign').strip(),
                }
            },
            expected_status=http.client.NOT_FOUND,
        )

    def test_good_signature_v1(self):
        creds_ref = {'secret': 'b121dd41cdcc42fe9f70e572e84295aa'}
        credentials = {
            'token': 'UFVUCjFCMk0yWThBc2dUcGdBbVk3UGhDZmc9PQphcHB'
            'saWNhdGlvbi9vY3RldC1zdHJlYW0KVHVlLCAxMSBEZWMgMjAxM'
            'iAyMTo0MTo0MSBHTVQKL2NvbnRfczMvdXBsb2FkZWRfZnJ'
            'vbV9zMy50eHQ=',
            'signature': 'IL4QLcLVaYgylF9iHj6Wb8BGZsw=',
        }

        self.assertIsNone(
            s3tokens.S3Resource._check_signature(creds_ref, credentials)
        )

    def test_bad_signature_v1(self):
        creds_ref = {'secret': 'b121dd41cdcc42fe9f70e572e84295aa'}
        credentials = {
            'token': 'UFVUCjFCMk0yWThBc2dUcGdBbVk3UGhDZmc9PQphcHB'
            'saWNhdGlvbi9vY3RldC1zdHJlYW0KVHVlLCAxMSBEZWMgMjAxM'
            'iAyMTo0MTo0MSBHTVQKL2NvbnRfczMvdXBsb2FkZWRfZnJ'
            'vbV9zMy50eHQ=',
            'signature': uuid.uuid4().hex,
        }

        self.assertRaises(
            exception.Unauthorized,
            s3tokens.S3Resource._check_signature,
            creds_ref,
            credentials,
        )

    def test_good_signature_v4(self):
        creds_ref = {'secret': 'e7a7a2240136494986991a6598d9fb9f'}
        credentials = {
            'token': 'QVdTNC1ITUFDLVNIQTI1NgoyMDE1MDgyNFQxMTIwNDFaCjIw'
            'MTUwODI0L1JlZ2lvbk9uZS9zMy9hd3M0X3JlcXVlc3QKZjIy'
            'MTU1ODBlZWI5YTE2NzM1MWJkOTNlODZjM2I2ZjA0YTkyOGY1'
            'YzU1MjBhMzkzNWE0NTM1NDBhMDk1NjRiNQ==',
            'signature': '730ba8f58df6ffeadd78f402e990b2910d60'
            'bc5c2aec63619734f096a4dd77be',
        }

        self.assertIsNone(
            s3tokens.S3Resource._check_signature(creds_ref, credentials)
        )

    def test_good_iam_signature_v4(self):
        creds_ref = {'secret': 'e7a7a2240136494986991a6598d9fb9f'}
        credentials = {
            'token': 'QVdTNC1ITUFDLVNIQTI1NgoyMDE1MDgyNFQxMTIwNDFaCjIw'
            'MTUwODI0L1JlZ2lvbk9uZS9pYW0vYXdzNF9yZXF1ZXN0CmYy'
            'MjE1NTgwZWViOWExNjczNTFiZDkzZTg2YzNiNmYwNGE5Mjhm'
            'NWM1NTIwYTM5MzVhNDUzNTQwYTA5NTY0YjU=',
            'signature': 'db4e15b3040f6afaa9d9d16002de2fc3425b'
            'eea0c6ea8c1b2bb674f052030b7d',
        }

        self.assertIsNone(
            s3tokens.S3Resource._check_signature(creds_ref, credentials)
        )

    def test_good_sts_signature_v4(self):
        creds_ref = {'secret': 'e7a7a2240136494986991a6598d9fb9f'}
        credentials = {
            'token': 'QVdTNC1ITUFDLVNIQTI1NgoyMDE1MDgyNFQxMTIwNDFaCjIw'
            'MTUwODI0L1JlZ2lvbk9uZS9zdHMvYXdzNF9yZXF1ZXN0CmYy'
            'MjE1NTgwZWViOWExNjczNTFiZDkzZTg2YzNiNmYwNGE5Mjhm'
            'NWM1NTIwYTM5MzVhNDUzNTQwYTA5NTY0YjU=',
            'signature': '3aa0b6f1414b92b2a32584068f83c6d09b7f'
            'daa11d4ea58912bbf1d8616ef56d',
        }

        self.assertIsNone(
            s3tokens.S3Resource._check_signature(creds_ref, credentials)
        )

    def test_bad_signature_v4(self):
        creds_ref = {'secret': 'e7a7a2240136494986991a6598d9fb9f'}
        # the signature is wrong on an otherwise correctly formed token
        credentials = {
            'token': 'QVdTNC1ITUFDLVNIQTI1NgoyMDE1MDgyNFQxMTIwNDFaCjIw'
            'MTUwODI0L1JlZ2lvbk9uZS9zMy9hd3M0X3JlcXVlc3QKZjIy'
            'MTU1ODBlZWI5YTE2NzM1MWJkOTNlODZjM2I2ZjA0YTkyOGY1'
            'YzU1MjBhMzkzNWE0NTM1NDBhMDk1NjRiNQ==',
            'signature': uuid.uuid4().hex,
        }

        self.assertRaises(
            exception.Unauthorized,
            s3tokens.S3Resource._check_signature,
            creds_ref,
            credentials,
        )

    def test_bad_service_v4(self):
        creds_ref = {'secret': 'e7a7a2240136494986991a6598d9fb9f'}
        # use 'bad' as the service scope instead of a recognised service
        credentials = {
            'token': 'QVdTNC1ITUFDLVNIQTI1NgoyMDE1MDgyNFQxMTIwNDFaCjIw'
            'MTUwODI0L1JlZ2lvbk9uZS9iYWQvYXdzNF9yZXF1ZXN0CmYy'
            'MjE1NTgwZWViOWExNjczNTFiZDkzZTg2YzNiNmYwNGE5Mjhm'
            'NWM1NTIwYTM5MzVhNDUzNTQwYTA5NTY0YjU=',
            'signature': '1a2dec50eb1bba97887d1103c2ead6a39911'
            '98c4be2537cf14d40b64cceb888b',
        }

        self.assertRaises(
            exception.Unauthorized,
            s3tokens.S3Resource._check_signature,
            creds_ref,
            credentials,
        )

    def test_bad_signing_key_v4(self):
        creds_ref = {'secret': 'e7a7a2240136494986991a6598d9fb9f'}
        # signed with aws4_badrequest instead of aws4_request
        credentials = {
            'token': 'QVdTNC1ITUFDLVNIQTI1NgoyMDE1MDgyNFQxMTIwNDFaCjIw'
            'MTUwODI0L1JlZ2lvbk9uZS9zMy9hd3M0X3JlcXVlc3QKZjIy'
            'MTU1ODBlZWI5YTE2NzM1MWJkOTNlODZjM2I2ZjA0YTkyOGY1'
            'YzU1MjBhMzkzNWE0NTM1NDBhMDk1NjRiNQ==',
            'signature': '52d02211a3767d00b2104ab28c9859003b0e'
            '9c8735cd10de7975f3b1212cca41',
        }

        self.assertRaises(
            exception.Unauthorized,
            s3tokens.S3Resource._check_signature,
            creds_ref,
            credentials,
        )

    def test_bad_short_scope_v4(self):
        creds_ref = {'secret': 'e7a7a2240136494986991a6598d9fb9f'}
        # credential scope has too few parts, missing final /aws4_request
        credentials = {
            'token': 'QVdTNC1ITUFDLVNIQTI1NgoyMDE1MDgyNFQxMTIwNDFaCjIw'
            'MTUwODI0L1JlZ2lvbk9uZS9zMwpmMjIxNTU4MGVlYjlhMTY3'
            'MzUxYmQ5M2U4NmMzYjZmMDRhOTI4ZjVjNTUyMGEzOTM1YTQ1'
            'MzU0MGEwOTU2NGI1',
            'signature': '28a075f1ee41e96c431153914998443ff0f5'
            '5fe93d31b37181f13ff4865942a2',
        }

        self.assertRaises(
            exception.Unauthorized,
            s3tokens.S3Resource._check_signature,
            creds_ref,
            credentials,
        )

    def test_bad_token_v4(self):
        creds_ref = {'secret': 'e7a7a2240136494986991a6598d9fb9f'}
        # token has invalid format of first part
        credentials = {'token': 'QVdTNC1BQUEKWApYClg=', 'signature': ''}
        self.assertRaises(
            exception.Unauthorized,
            s3tokens.S3Resource._check_signature,
            creds_ref,
            credentials,
        )

        # token has invalid format of scope
        credentials = {
            'token': 'QVdTNC1ITUFDLVNIQTI1NgpYCi8vczMvYXdzTl9yZXF1ZXN0Clg=',
            'signature': '',
        }
        self.assertRaises(
            exception.Unauthorized,
            s3tokens.S3Resource._check_signature,
            creds_ref,
            credentials,
        )
