# Copyright (c) 2015 Mirantis, Inc.
# 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
#
#         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.

"""Tests for validators."""
import binascii
import json
from unittest import mock

from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.asymmetric import padding
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives import serialization

import jsonschema
from oslotest import base

from refstack.api import exceptions as api_exc
from refstack.api import validators


class ValidatorsTestCase(base.BaseTestCase):
    """Test case for validator's helpers."""

    def test_str_validation_error(self):
        err = api_exc.ValidationError(
            'Something went wrong!',
            AttributeError("'NoneType' object has no attribute 'a'")
        )
        self.assertEqual(err.title, 'Something went wrong!')
        self.assertEqual("%s(%s: %s)" % (
            'Something went wrong!',
            'AttributeError',
            "'NoneType' object has no attribute 'a'"
        ), str(err))
        err = api_exc.ValidationError(
            'Something went wrong again!'
        )
        self.assertEqual('Something went wrong again!', str(err))

    def test_is_uuid(self):
        self.assertTrue(validators.is_uuid('12345678123456781234567812345678'))

    def test_is_uuid_fail(self):
        self.assertFalse(validators.is_uuid('some_string'))

    def test_checker_uuid(self):
        value = validators.checker_uuid('12345678123456781234567812345678')
        self.assertTrue(value)

    def test_checker_uuid_fail(self):
        self.assertFalse(validators.checker_uuid('some_string'))


class TestResultValidatorTestCase(base.BaseTestCase):
    """Test case for TestResultValidator."""

    FAKE_JSON = {
        'cpid': 'foo',
        'duration_seconds': 10,
        'results': [
            {'name': 'tempest.some.test'},
            {'name': 'tempest.test', 'uid': '12345678'}
        ]
    }

    FAKE_JSON_WITH_EMPTY_RESULTS = {
        'cpid': 'foo',
        'duration_seconds': 20,
        'results': [
        ]
    }

    def setUp(self):
        super(TestResultValidatorTestCase, self).setUp()
        self.validator = validators.TestResultValidator()

    def test_assert_id(self):
        value = self.validator.assert_id('12345678123456781234567812345678')
        self.assertTrue(value)

    def test_assert_id_fail(self):
        self.assertFalse(self.validator.assert_id('some_string'))

    def test_validation(self):
        with mock.patch('jsonschema.validate') as mock_validate:
            request = mock.Mock()
            request.body = json.dumps(self.FAKE_JSON).encode('utf-8')
            request.headers = {}
            self.validator.validate(request)
            mock_validate.assert_called_once_with(self.FAKE_JSON,
                                                  self.validator.schema)

    def test_validation_with_signature(self):
        request = mock.Mock()
        request.body = json.dumps(self.FAKE_JSON).encode('utf-8')

        key = rsa.generate_private_key(
            public_exponent=65537,
            key_size=1024,
            backend=default_backend()
        )
        signer = key.signer(padding.PKCS1v15(), hashes.SHA256())
        signer.update(request.body)
        sign = signer.finalize()
        pubkey = key.public_key().public_bytes(
            serialization.Encoding.OpenSSH,
            serialization.PublicFormat.OpenSSH
        )
        request.headers = {
            'X-Signature': binascii.b2a_hex(sign),
            'X-Public-Key': pubkey
        }
        self.validator.validate(request)

    def test_validation_fail_no_json(self):
        wrong_request = mock.Mock()
        wrong_request.body = b'foo'
        self.assertRaises(api_exc.ValidationError,
                          self.validator.validate,
                          wrong_request)
        try:
            self.validator.validate(wrong_request)
        except api_exc.ValidationError as e:
            self.assertIsInstance(e.exc, ValueError)

    def test_validation_fail(self):
        wrong_request = mock.Mock()
        wrong_request.body = json.dumps({
            'foo': 'bar'
        }).encode('utf-8')
        self.assertRaises(api_exc.ValidationError,
                          self.validator.validate,
                          wrong_request)
        try:
            self.validator.validate(wrong_request)
        except api_exc.ValidationError as e:
            self.assertIsInstance(e.exc, jsonschema.ValidationError)

    def test_validation_fail_with_empty_result(self):
        wrong_request = mock.Mock()
        wrong_request.body = json.dumps(
            self.FAKE_JSON_WITH_EMPTY_RESULTS
        ).encode('utf-8')
        self.assertRaises(api_exc.ValidationError,
                          self.validator.validate,
                          wrong_request)

    @mock.patch('jsonschema.validate')
    def test_validation_with_broken_signature(self, mock_validate):

        request = mock.Mock()
        request.body = json.dumps(self.FAKE_JSON).encode('utf-8')
        key = rsa.generate_private_key(
            public_exponent=65537,
            key_size=2048,
            backend=default_backend()
        )
        pubkey = key.public_key().public_bytes(
            serialization.Encoding.OpenSSH,
            serialization.PublicFormat.OpenSSH
        )
        request.headers = {
            'X-Signature': binascii.b2a_hex(b'fake_sign'),
            'X-Public-Key': pubkey
        }
        self.assertRaises(api_exc.ValidationError,
                          self.validator.validate,
                          request)
        try:
            self.validator.validate(request)
        except api_exc.ValidationError as e:
            self.assertEqual(e.title,
                             'Signature verification failed')

        request.headers = {
            'X-Signature': 'z-z-z-z!!!',
            'X-Public-Key': pubkey
        }
        try:
            self.validator.validate(request)
        except api_exc.ValidationError as e:
            self.assertEqual(e.title, 'Malformed signature')

        request.headers = {
            'X-Signature': binascii.b2a_hex(b'fake_sign'),
            'X-Public-Key': b'H--0'
        }
        try:
            self.validator.validate(request)
        except api_exc.ValidationError as e:
            self.assertIsInstance(e.exc, ValueError)


class PubkeyValidatorTestCase(base.BaseTestCase):
    """Test case for TestResultValidator."""

    FAKE_JSON = {
        'raw_key': 'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgQC4GAwIjFN6mkN09Vfc8h'
                   'VCnbztex/kjVdPlGraBLR+M9VoehOMJgLawpn2f+rM7NjDDgIwvj0kHVMZ'
                   'cBk5MZ1eQg3ACtP2EBw0SLLZ9uMSuHoDTf8oHVgNlNrHL3sc/QYJYfSqRh'
                   'FS2JvIVNnC2iG8jwnxUBI9rBspYU8AkrrczQ== Don\'t_Panic.',
        'self_signature': '9d6c4c74b4ec47bb4db8f288a502d2d2f686e7228d387377b8'
                          'c89ee67345ad04f8e518e0a627afe07217defbbd8acdd6dd88'
                          '74104e631731a1fb4dab1a34e06a0680f11337d1fae0b7a9ad'
                          '5942e0aacd2245c4cf7a78a96c4800eb4f6d8c363822aaaf43'
                          'aa3a648ddee84f3ea0b91e2e977ca19df72ad80226c12b1221'
                          'c2fb61'
    }

    def setUp(self):
        super(PubkeyValidatorTestCase, self).setUp()
        self.validator = validators.PubkeyValidator()

    def test_validation(self):
        request = mock.Mock()
        request.body = json.dumps(self.FAKE_JSON).encode('utf-8')
        self.validator.validate(request)

    def test_validation_fail_no_json(self):
        wrong_request = mock.Mock()
        wrong_request.body = b'foo'
        self.assertRaises(api_exc.ValidationError,
                          self.validator.validate,
                          wrong_request)
        try:
            self.validator.validate(wrong_request)
        except api_exc.ValidationError as e:
            self.assertIsInstance(e.exc, ValueError)

    def test_validation_fail(self):
        wrong_request = mock.Mock()
        wrong_request.body = json.dumps({
            'foo': 'bar'
        }).encode('utf-8')
        self.assertRaises(api_exc.ValidationError,
                          self.validator.validate,
                          wrong_request)
        try:
            self.validator.validate(wrong_request)
        except api_exc.ValidationError as e:
            self.assertIsInstance(e.exc, jsonschema.ValidationError)

    @mock.patch('jsonschema.validate')
    def test_validation_with_broken_signature(self, mock_validate):
        body = self.FAKE_JSON.copy()
        body['self_signature'] = 'deadbeef'

        request = mock.Mock()
        request.body = json.dumps(body).encode('utf-8')
        try:
            self.validator.validate(request)
        except api_exc.ValidationError as e:
            self.assertEqual(e.title,
                             'Signature verification failed')

        body = {
            'raw_key': 'fake key comment',
            'self_signature': 'deadbeef'
        }
        request = mock.Mock()
        request.body = json.dumps(body).encode('utf-8')
        try:
            self.validator.validate(request)
        except api_exc.ValidationError as e:
            self.assertEqual(e.title,
                             'Public key has unsupported format')

        body = {
            'raw_key': 'ssh-rsa key comment',
            'self_signature': 'deadbeef?'
        }
        request = mock.Mock()
        request.body = json.dumps(body).encode('utf-8')
        try:
            self.validator.validate(request)
        except api_exc.ValidationError as e:
            self.assertEqual(e.title,
                             'Malformed signature')

        body = {
            'raw_key': 'ssh-rsa key comment',
            'self_signature': 'deadbeef'
        }
        request = mock.Mock()
        request.body = json.dumps(body).encode('utf-8')
        try:
            self.validator.validate(request)
        except api_exc.ValidationError as e:
            self.assertEqual(e.title,
                             'Malformed public key')