mirror of
https://github.com/prowler-cloud/prowler.git
synced 2026-07-04 19:21:51 +00:00
Hugo Pereira Brito
683 lines
24 KiB
Python
683 lines
24 KiB
Python
import io
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import os
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import tempfile
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import zipfile
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from re import search
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from unittest.mock import patch
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import mock
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import pytest
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from boto3 import client, resource
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from botocore.client import ClientError
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from moto import mock_aws
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from prowler.providers.aws.services.awslambda.awslambda_service import (
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AuthType,
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Function,
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Lambda,
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)
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from tests.providers.aws.utils import (
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AWS_ACCOUNT_NUMBER,
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AWS_REGION_EU_WEST_1,
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AWS_REGION_US_EAST_1,
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set_mocked_aws_provider,
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)
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LAMBDA_FUNCTION_CODE = """def lambda_handler(event, context):
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print("custom log event")
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return event
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"""
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def create_zip_file(code: str = "") -> io.BytesIO:
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zip_output = io.BytesIO()
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zip_file = zipfile.ZipFile(zip_output, "w", zipfile.ZIP_DEFLATED)
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if not code:
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zip_file.writestr(
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"lambda_function.py",
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LAMBDA_FUNCTION_CODE,
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)
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else:
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zip_file.writestr("lambda_function.py", code)
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zip_file.close()
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zip_output.seek(0)
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return zip_output
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def mock_request_get(_):
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"""Mock requests.get() to get the Lambda Code in Zip Format"""
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mock_resp = mock.MagicMock
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mock_resp.status_code = 200
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mock_resp.content = create_zip_file().read()
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return mock_resp
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# Mock generate_regional_clients()
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def mock_generate_regional_clients(provider, service):
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regional_client_eu_west_1 = provider.session.current_session.client(
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service, region_name=AWS_REGION_EU_WEST_1
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)
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regional_client_us_east_1 = provider.session.current_session.client(
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service, region_name=AWS_REGION_US_EAST_1
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)
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regional_client_eu_west_1.region = AWS_REGION_EU_WEST_1
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regional_client_us_east_1.region = AWS_REGION_US_EAST_1
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return {
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AWS_REGION_EU_WEST_1: regional_client_eu_west_1,
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AWS_REGION_US_EAST_1: regional_client_us_east_1,
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}
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@patch(
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"prowler.providers.aws.aws_provider.AwsProvider.generate_regional_clients",
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new=mock_generate_regional_clients,
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)
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class Test_Lambda_Service:
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# Test Lambda Client
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def test_get_client(self):
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awslambda = Lambda(set_mocked_aws_provider([AWS_REGION_US_EAST_1]))
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assert (
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awslambda.regional_clients[AWS_REGION_EU_WEST_1].__class__.__name__
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== "Lambda"
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)
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# Test Lambda Session
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def test__get_session__(self):
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awslambda = Lambda(set_mocked_aws_provider([AWS_REGION_US_EAST_1]))
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assert awslambda.session.__class__.__name__ == "Session"
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# Test Lambda Service
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def test__get_service__(self):
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awslambda = Lambda(set_mocked_aws_provider([AWS_REGION_US_EAST_1]))
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assert awslambda.service == "lambda"
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def test_function_limit_selects_latest_functions_for_analysis(self):
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awslambda = Lambda.__new__(Lambda)
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awslambda.functions = {
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"old": Function(
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name="old",
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arn="old",
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security_groups=[],
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last_modified="2024-01-01T00:00:00.000+0000",
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region=AWS_REGION_EU_WEST_1,
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),
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"new": Function(
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name="new",
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arn="new",
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security_groups=[],
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last_modified="2024-01-02T00:00:00.000+0000",
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region=AWS_REGION_EU_WEST_1,
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),
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}
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awslambda.function_limit = 1
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awslambda._select_functions_for_analysis()
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assert list(awslambda.functions) == ["new"]
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def test_function_limit_selects_global_latest_across_regions(self):
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class FakePaginator:
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def __init__(self, functions):
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self.functions = functions
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def paginate(self, **kwargs):
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assert "PageSize" not in kwargs
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return [{"Functions": self.functions}]
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class FakeLambdaClient:
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def __init__(self, region, functions):
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self.region = region
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self.functions = functions
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def get_paginator(self, name):
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assert name == "list_functions"
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return FakePaginator(self.functions)
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awslambda = Lambda.__new__(Lambda)
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awslambda.functions = {}
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awslambda.security_groups_in_use = set()
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awslambda.regions_with_functions = set()
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awslambda.function_limit = 1
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awslambda.audit_resources = []
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old_client = FakeLambdaClient(
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AWS_REGION_EU_WEST_1,
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[
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{
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"FunctionName": "old",
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"FunctionArn": "arn:aws:lambda:eu-west-1:123456789012:function:old",
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"LastModified": "2024-01-01T00:00:00.000+0000",
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}
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],
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)
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new_client = FakeLambdaClient(
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AWS_REGION_US_EAST_1,
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[
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{
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"FunctionName": "new",
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"FunctionArn": "arn:aws:lambda:us-east-1:123456789012:function:new",
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"LastModified": "2024-01-02T00:00:00.000+0000",
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}
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],
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)
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awslambda._list_functions(old_client)
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awslambda._list_functions(new_client)
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awslambda._select_functions_for_analysis()
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assert [function.name for function in awslambda.functions.values()] == ["new"]
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def test_function_limit_keeps_complete_auxiliary_indexes(self):
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class FakePaginator:
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def __init__(self, functions):
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self.functions = functions
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def paginate(self, **kwargs):
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assert "PageSize" not in kwargs
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return [{"Functions": self.functions}]
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class FakeLambdaClient:
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region = AWS_REGION_US_EAST_1
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def get_paginator(self, name):
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assert name == "list_functions"
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return FakePaginator(
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[
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{
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"FunctionName": "old",
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"FunctionArn": (
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f"arn:aws:lambda:{AWS_REGION_US_EAST_1}:"
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f"{AWS_ACCOUNT_NUMBER}:function:old"
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),
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"LastModified": "2024-01-01T00:00:00.000+0000",
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"VpcConfig": {"SecurityGroupIds": ["sg-old"]},
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},
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{
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"FunctionName": "new",
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"FunctionArn": (
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f"arn:aws:lambda:{AWS_REGION_US_EAST_1}:"
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f"{AWS_ACCOUNT_NUMBER}:function:new"
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),
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"LastModified": "2024-01-02T00:00:00.000+0000",
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"VpcConfig": {"SecurityGroupIds": ["sg-new"]},
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},
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]
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)
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awslambda = Lambda.__new__(Lambda)
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awslambda.functions = {}
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awslambda.security_groups_in_use = set()
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awslambda.regions_with_functions = set()
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awslambda.function_limit = 1
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awslambda.audit_resources = []
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awslambda._list_functions(FakeLambdaClient())
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awslambda._select_functions_for_analysis()
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assert [function.name for function in awslambda.functions.values()] == ["new"]
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assert awslambda.security_groups_in_use == {"sg-old", "sg-new"}
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assert awslambda.regions_with_functions == {AWS_REGION_US_EAST_1}
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def test_list_event_source_mappings_uses_selected_functions_as_api_scope(self):
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class FakePaginator:
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def __init__(self):
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self.paginate_calls = []
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def paginate(self, **kwargs):
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self.paginate_calls.append(kwargs)
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function_name = kwargs["FunctionName"]
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return [
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{
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"EventSourceMappings": [
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{
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"UUID": f"{function_name}-mapping",
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"FunctionArn": (
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f"arn:aws:lambda:{AWS_REGION_US_EAST_1}:"
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f"{AWS_ACCOUNT_NUMBER}:function:{function_name}:1"
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),
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"EventSourceArn": "arn:aws:sqs:queue",
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"State": "Enabled",
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"BatchSize": 10,
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}
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]
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}
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]
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class FakeLambdaClient:
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region = AWS_REGION_US_EAST_1
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def __init__(self):
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self.paginator = FakePaginator()
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def get_paginator(self, name):
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assert name == "list_event_source_mappings"
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return self.paginator
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selected_arn = (
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f"arn:aws:lambda:{AWS_REGION_US_EAST_1}:"
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f"{AWS_ACCOUNT_NUMBER}:function:selected"
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)
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other_region_arn = (
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f"arn:aws:lambda:{AWS_REGION_EU_WEST_1}:"
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f"{AWS_ACCOUNT_NUMBER}:function:other-region"
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)
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awslambda = Lambda.__new__(Lambda)
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awslambda.function_limit = 1
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awslambda.functions = {
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selected_arn: Function(
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name="selected",
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arn=selected_arn,
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security_groups=[],
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region=AWS_REGION_US_EAST_1,
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),
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other_region_arn: Function(
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name="other-region",
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arn=other_region_arn,
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security_groups=[],
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region=AWS_REGION_EU_WEST_1,
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),
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}
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regional_client = FakeLambdaClient()
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awslambda._list_event_source_mappings(regional_client)
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assert regional_client.paginator.paginate_calls == [
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{"FunctionName": "selected"}
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]
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assert len(awslambda.functions[selected_arn].event_source_mappings) == 1
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assert (
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awslambda.functions[selected_arn].event_source_mappings[0].uuid
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== "selected-mapping"
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)
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assert not awslambda.functions[other_region_arn].event_source_mappings
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def test_list_event_source_mappings_keeps_unlimited_regional_api_scope(self):
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class FakePaginator:
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def __init__(self):
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self.paginate_calls = []
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def paginate(self, **kwargs):
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self.paginate_calls.append(kwargs)
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return [
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{
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"EventSourceMappings": [
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{
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"UUID": "selected-mapping",
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"FunctionArn": selected_arn,
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"EventSourceArn": "arn:aws:sqs:queue",
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"State": "Enabled",
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}
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]
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}
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]
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class FakeLambdaClient:
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region = AWS_REGION_US_EAST_1
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def __init__(self):
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self.paginator = FakePaginator()
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def get_paginator(self, name):
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assert name == "list_event_source_mappings"
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return self.paginator
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selected_arn = (
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f"arn:aws:lambda:{AWS_REGION_US_EAST_1}:"
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f"{AWS_ACCOUNT_NUMBER}:function:selected"
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)
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awslambda = Lambda.__new__(Lambda)
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awslambda.function_limit = None
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awslambda.functions = {
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selected_arn: Function(
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name="selected",
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arn=selected_arn,
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security_groups=[],
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region=AWS_REGION_US_EAST_1,
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)
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}
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regional_client = FakeLambdaClient()
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awslambda._list_event_source_mappings(regional_client)
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assert regional_client.paginator.paginate_calls == [{}]
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assert len(awslambda.functions[selected_arn].event_source_mappings) == 1
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def test_list_event_source_mappings_continues_after_invalid_parameter_value(self):
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class FakePaginator:
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def paginate(self, **kwargs):
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function_name = kwargs["FunctionName"]
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if function_name == "deleted":
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raise ClientError(
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{
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"Error": {
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"Code": "InvalidParameterValueException",
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"Message": "Function no longer exists",
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}
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},
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"ListEventSourceMappings",
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)
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return [
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{
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"EventSourceMappings": [
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{
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"UUID": f"{function_name}-mapping",
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"FunctionArn": (
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f"arn:aws:lambda:{AWS_REGION_US_EAST_1}:"
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f"{AWS_ACCOUNT_NUMBER}:function:{function_name}"
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),
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"EventSourceArn": "arn:aws:sqs:queue",
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"State": "Enabled",
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}
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]
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}
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]
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class FakeLambdaClient:
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region = AWS_REGION_US_EAST_1
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def get_paginator(self, name):
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assert name == "list_event_source_mappings"
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return FakePaginator()
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deleted_arn = (
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f"arn:aws:lambda:{AWS_REGION_US_EAST_1}:"
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f"{AWS_ACCOUNT_NUMBER}:function:deleted"
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)
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remaining_arn = (
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f"arn:aws:lambda:{AWS_REGION_US_EAST_1}:"
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f"{AWS_ACCOUNT_NUMBER}:function:remaining"
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)
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awslambda = Lambda.__new__(Lambda)
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awslambda.function_limit = 2
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awslambda.functions = {
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deleted_arn: Function(
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name="deleted",
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arn=deleted_arn,
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security_groups=[],
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region=AWS_REGION_US_EAST_1,
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),
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remaining_arn: Function(
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name="remaining",
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arn=remaining_arn,
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security_groups=[],
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region=AWS_REGION_US_EAST_1,
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),
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}
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awslambda._list_event_source_mappings(FakeLambdaClient())
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assert not awslambda.functions[deleted_arn].event_source_mappings
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assert len(awslambda.functions[remaining_arn].event_source_mappings) == 1
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assert (
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awslambda.functions[remaining_arn].event_source_mappings[0].uuid
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== "remaining-mapping"
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)
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def test_list_event_source_mappings_raises_non_transient_client_error(self):
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class FakePaginator:
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def paginate(self, **kwargs):
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raise ClientError(
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{
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"Error": {
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"Code": "AccessDeniedException",
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"Message": "Access denied",
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}
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},
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"ListEventSourceMappings",
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)
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class FakeLambdaClient:
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region = AWS_REGION_US_EAST_1
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def get_paginator(self, name):
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assert name == "list_event_source_mappings"
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return FakePaginator()
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function_arn = (
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f"arn:aws:lambda:{AWS_REGION_US_EAST_1}:"
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f"{AWS_ACCOUNT_NUMBER}:function:selected"
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)
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awslambda = Lambda.__new__(Lambda)
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awslambda.function_limit = 1
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awslambda.functions = {
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function_arn: Function(
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name="selected",
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arn=function_arn,
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security_groups=[],
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region=AWS_REGION_US_EAST_1,
|
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)
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}
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with pytest.raises(ClientError) as error:
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awslambda._list_event_source_mappings(FakeLambdaClient())
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assert error.value.response["Error"]["Code"] == "AccessDeniedException"
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|
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@mock_aws
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def test_list_functions(self):
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# Create IAM Lambda Role
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iam_client = client("iam", region_name=AWS_REGION_EU_WEST_1)
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iam_role = iam_client.create_role(
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RoleName="test-lambda-role",
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AssumeRolePolicyDocument="test-policy",
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Path="/",
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)["Role"]["Arn"]
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# Create S3 Bucket
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s3_client = resource("s3", region_name=AWS_REGION_EU_WEST_1)
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s3_client.create_bucket(
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Bucket="test-bucket",
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CreateBucketConfiguration={"LocationConstraint": AWS_REGION_EU_WEST_1},
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)
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# Create Test Lambda 1
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lambda_client = client("lambda", region_name=AWS_REGION_EU_WEST_1)
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lambda_name_1 = "test-lambda-1"
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resp = lambda_client.create_function(
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FunctionName=lambda_name_1,
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Runtime="python3.7",
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Role=iam_role,
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Handler="lambda_function.lambda_handler",
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Code={"ZipFile": create_zip_file().read()},
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Description="test lambda function",
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Timeout=3,
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MemorySize=128,
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PackageType="ZIP",
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Publish=True,
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VpcConfig={
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"SecurityGroupIds": ["sg-123abc"],
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"SubnetIds": ["subnet-123abc"],
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},
|
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Environment={"Variables": {"db-password": "test-password"}},
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Tags={"test": "test"},
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)
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lambda_arn_1 = resp["FunctionArn"]
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# Update Lambda Policy
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lambda_policy = {
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"Version": "2012-10-17",
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"Id": "default",
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"Statement": [
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{
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"Action": "lambda:GetFunction",
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"Principal": "*",
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"Effect": "Allow",
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"Resource": f"arn:aws:lambda:{AWS_REGION_EU_WEST_1}:{AWS_ACCOUNT_NUMBER}:function:{lambda_name_1}",
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"Sid": "test",
|
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}
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],
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}
|
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_ = lambda_client.add_permission(
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FunctionName=lambda_name_1,
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StatementId="test",
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Action="lambda:GetFunction",
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Principal="*",
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)
|
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# Create Function URL Config
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|
_ = lambda_client.create_function_url_config(
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FunctionName=lambda_name_1,
|
|
AuthType=AuthType.AWS_IAM.value,
|
|
Cors={
|
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"AllowCredentials": True,
|
|
"AllowHeaders": [
|
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"string",
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],
|
|
"AllowMethods": [
|
|
"string",
|
|
],
|
|
"AllowOrigins": [
|
|
"*",
|
|
],
|
|
"ExposeHeaders": [
|
|
"string",
|
|
],
|
|
"MaxAge": 123,
|
|
},
|
|
)
|
|
|
|
# Create Test Lambda 2 (with the same attributes but different region)
|
|
lambda_client_2 = client("lambda", region_name=AWS_REGION_US_EAST_1)
|
|
lambda_name_2 = "test-lambda-2"
|
|
resp_2 = lambda_client_2.create_function(
|
|
FunctionName=lambda_name_2,
|
|
Runtime="python3.7",
|
|
Role=iam_role,
|
|
Handler="lambda_function.lambda_handler",
|
|
Code={"ZipFile": create_zip_file().read()},
|
|
Description="test lambda function",
|
|
Timeout=3,
|
|
MemorySize=128,
|
|
PackageType="ZIP",
|
|
Publish=True,
|
|
VpcConfig={
|
|
"SecurityGroupIds": ["sg-123abc"],
|
|
"SubnetIds": ["subnet-123abc"],
|
|
},
|
|
Environment={"Variables": {"db-password": "test-password"}},
|
|
Tags={"test": "test"},
|
|
)
|
|
lambda_arn_2 = resp_2["FunctionArn"]
|
|
|
|
with mock.patch(
|
|
"prowler.providers.aws.services.awslambda.awslambda_service.requests.get",
|
|
new=mock_request_get,
|
|
):
|
|
awslambda = Lambda(
|
|
set_mocked_aws_provider(audited_regions=[AWS_REGION_US_EAST_1])
|
|
)
|
|
assert awslambda.functions
|
|
assert len(awslambda.functions) == 2
|
|
# Lambda 1
|
|
assert awslambda.functions[lambda_arn_1].name == lambda_name_1
|
|
assert awslambda.functions[lambda_arn_1].arn == lambda_arn_1
|
|
assert awslambda.functions[lambda_arn_1].runtime == "python3.7"
|
|
assert awslambda.functions[lambda_arn_1].environment == {
|
|
"db-password": "test-password"
|
|
}
|
|
assert awslambda.functions[lambda_arn_1].region == AWS_REGION_EU_WEST_1
|
|
assert awslambda.functions[lambda_arn_1].policy == lambda_policy
|
|
|
|
assert awslambda.functions[lambda_arn_1].url_config
|
|
assert (
|
|
awslambda.functions[lambda_arn_1].url_config.auth_type
|
|
== AuthType.AWS_IAM
|
|
)
|
|
assert search(
|
|
"lambda-url.eu-west-1.on.aws",
|
|
awslambda.functions[lambda_arn_1].url_config.url,
|
|
)
|
|
|
|
assert awslambda.functions[lambda_arn_1].url_config.cors_config
|
|
assert awslambda.functions[
|
|
lambda_arn_1
|
|
].url_config.cors_config.allow_origins == ["*"]
|
|
assert awslambda.functions[lambda_arn_1].vpc_id == "vpc-123abc"
|
|
assert awslambda.functions[lambda_arn_1].subnet_ids == {"subnet-123abc"}
|
|
|
|
assert awslambda.functions[lambda_arn_1].tags == [{"test": "test"}]
|
|
|
|
# Lambda 2
|
|
assert awslambda.functions[lambda_arn_2].name == lambda_name_2
|
|
assert awslambda.functions[lambda_arn_2].arn == lambda_arn_2
|
|
assert awslambda.functions[lambda_arn_2].runtime == "python3.7"
|
|
assert awslambda.functions[lambda_arn_2].environment == {
|
|
"db-password": "test-password"
|
|
}
|
|
assert awslambda.functions[lambda_arn_2].region == AWS_REGION_US_EAST_1
|
|
# Emtpy policy
|
|
assert awslambda.functions[lambda_arn_2].policy == {}
|
|
|
|
# Lambda Code
|
|
with tempfile.TemporaryDirectory() as tmp_dir_name:
|
|
for function, function_code in awslambda._get_function_code():
|
|
if function.arn == lambda_arn_1 or function.arn == lambda_arn_2:
|
|
assert search(
|
|
f"https://awslambda-{function.region}-tasks.s3.{function.region}.amazonaws.com",
|
|
function_code.location,
|
|
)
|
|
assert function_code
|
|
function_code.code_zip.extractall(tmp_dir_name)
|
|
files_in_zip = next(os.walk(tmp_dir_name))[2]
|
|
assert len(files_in_zip) == 1
|
|
assert files_in_zip[0] == "lambda_function.py"
|
|
with open(
|
|
f"{tmp_dir_name}/{files_in_zip[0]}", "r"
|
|
) as lambda_code_file:
|
|
assert lambda_code_file.read() == LAMBDA_FUNCTION_CODE
|
|
|
|
@mock_aws
|
|
def test_function_limit_exposes_only_selected_functions(self):
|
|
lambda_client = client("lambda", region_name=AWS_REGION_US_EAST_1)
|
|
iam_client = client("iam", region_name=AWS_REGION_US_EAST_1)
|
|
iam_role = iam_client.create_role(
|
|
RoleName="test-role",
|
|
AssumeRolePolicyDocument="{}",
|
|
)["Role"]["Arn"]
|
|
for name in ("function-1", "function-2"):
|
|
lambda_client.create_function(
|
|
FunctionName=name,
|
|
Runtime="python3.7",
|
|
Role=iam_role,
|
|
Handler="lambda_function.lambda_handler",
|
|
Code={"ZipFile": create_zip_file().read()},
|
|
PackageType="ZIP",
|
|
)
|
|
awslambda = Lambda(
|
|
set_mocked_aws_provider(
|
|
audited_regions=[AWS_REGION_US_EAST_1],
|
|
audit_config={"max_lambda_functions": 1},
|
|
)
|
|
)
|
|
|
|
assert len(awslambda.functions) == 1
|
|
|
|
@mock_aws
|
|
def test_get_function_code_fetches_only_selected_functions(self):
|
|
lambda_client = client("lambda", region_name=AWS_REGION_US_EAST_1)
|
|
iam_client = client("iam", region_name=AWS_REGION_US_EAST_1)
|
|
iam_role = iam_client.create_role(
|
|
RoleName="test-role",
|
|
AssumeRolePolicyDocument="{}",
|
|
)["Role"]["Arn"]
|
|
for name in ("function-1", "function-2"):
|
|
lambda_client.create_function(
|
|
FunctionName=name,
|
|
Runtime="python3.7",
|
|
Role=iam_role,
|
|
Handler="lambda_function.lambda_handler",
|
|
Code={"ZipFile": create_zip_file().read()},
|
|
PackageType="ZIP",
|
|
)
|
|
awslambda = Lambda(
|
|
set_mocked_aws_provider(
|
|
audited_regions=[AWS_REGION_US_EAST_1],
|
|
audit_config={"max_lambda_functions": 1},
|
|
)
|
|
)
|
|
fetched = []
|
|
|
|
def fetch_function_code(function_name, _function_region):
|
|
fetched.append(function_name)
|
|
return mock.MagicMock()
|
|
|
|
awslambda._fetch_function_code = fetch_function_code
|
|
|
|
assert len(list(awslambda._get_function_code())) == 1
|
|
assert len(fetched) == 1
|