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# to you 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
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import base64
import os

from gremlin_python.driver.auth import basic, sigv4
from gremlin_python.driver.http_request import HttpRequest


def create_mock_request():
    return HttpRequest(
        method="POST",
        url="https://test_url:8182/gremlin",
        headers={
            'content-type': 'application/vnd.graphbinary-v4.0',
            'accept': 'application/vnd.graphbinary-v4.0',
        },
        body=b'',
    )


class TestAuth(object):

    def test_basic_auth_request(self):
        mock_request = create_mock_request()
        assert 'authorization' not in mock_request.headers
        basic('username', 'password')(mock_request)
        assert 'authorization' in mock_request.headers
        expected = 'Basic ' + base64.b64encode('username:password'.encode('utf-8')).decode('utf-8')
        assert expected == mock_request.headers['authorization']

    def test_sigv4_auth_request(self):
        mock_request = create_mock_request()
        assert 'Authorization' not in mock_request.headers
        assert 'X-Amz-Date' not in mock_request.headers
        os.environ['AWS_ACCESS_KEY_ID'] = 'MOCK_ID'
        os.environ['AWS_SECRET_ACCESS_KEY'] = 'MOCK_KEY'
        sigv4('gremlin-east-1', 'tinkerpop-sigv4')(mock_request)
        assert mock_request.headers['X-Amz-Date'] is not None
        assert mock_request.headers['Authorization'].startswith('AWS4-HMAC-SHA256 Credential=MOCK_ID')
        assert 'gremlin-east-1/tinkerpop-sigv4/aws4_request' in mock_request.headers['Authorization']
        assert 'Signature=' in mock_request.headers['Authorization']

    def test_sigv4_auth_request_session_token(self):
        mock_request = create_mock_request()
        assert 'Authorization' not in mock_request.headers
        assert 'X-Amz-Date' not in mock_request.headers
        assert 'X-Amz-Security-Token' not in mock_request.headers
        os.environ['AWS_ACCESS_KEY_ID'] = 'MOCK_ID'
        os.environ['AWS_SECRET_ACCESS_KEY'] = 'MOCK_KEY'
        os.environ['AWS_SESSION_TOKEN'] = 'MOCK_TOKEN'
        sigv4('gremlin-east-1', 'tinkerpop-sigv4')(mock_request)
        assert mock_request.headers['X-Amz-Date'] is not None
        assert mock_request.headers['Authorization'].startswith('AWS4-HMAC-SHA256 Credential=')
        assert mock_request.headers['X-Amz-Security-Token'] == 'MOCK_TOKEN'
        assert 'gremlin-east-1/tinkerpop-sigv4/aws4_request' in mock_request.headers['Authorization']
        assert 'Signature=' in mock_request.headers['Authorization']
