b-cfn-custom-api-key-authorizer 1.1.0

Enables ApiKey functionality (like in ApiGateway V1) for ApiGateway V2.

B.CfnCustomApiKeyAuthorizer

An AWS CDK resource that enables protection of your public APIs by using Api Keys.

Description

This custom authorizer enables Api Key functionality (just like in ApiGateway V1

• https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-setup-api-key-with-console.html) for APIs that are created via ApiGateway V2 (originally ApiGateway V2 does not have Api Key functionality out-of-the-box). If you want to protect your API by generating a secret key and giving only for the intended clients - this library is just for you.

Remarks

Biomapas aims to modernise life-science industry by sharing its IT knowledge with other companies and the community. This is an open source library intended to be used by anyone. Improvements and pull requests are welcome.

Related technology

• Python3
• AWS CDK
• AWS CloudFormation
• AWS API Gateway
• AWS API Gateway Authorizer
• AWS Lambda

Assumptions

This project assumes you are an expert in infrastructure-as-code via AWS CloudFormation and AWS CDK. You must clearly understand how AWS API Gateway endpoints are protected with Authorizers / Custom Authorizers and how it is managed via CloudFormation or CDK.

• Excellent knowledge in IaaC (Infrastructure as a Code) principles.
• Excellent knowledge in API Gateway, Authorizers.
• Good experience in AWS CDK and AWS CloudFormation.
• Good Python skills and basics of OOP.

Useful sources

• AWS CDK:
  https://docs.aws.amazon.com/cdk/api/latest/docs/aws-construct-library.html
• AWS CloudFormation:
  https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html
• API Gateway with CloudFormation:
  https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-apigatewayv2-api.html
• AWS Custom Authorizers:
  https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-use-lambda-authorizer.html

Install

Before installing this library, ensure you have these tools setup:

• Python / Pip
• AWS CDK

To install this project from source run:

pip install .

Or you can install it from a PyPi repository:

pip install b-cfn-custom-api-key-authorizer

Usage & Examples

Firstly, create an api and stage:

from aws_cdk.aws_apigatewayv2 import CfnApi, CfnStage

api = CfnApi(...)
api_stage = CfnStage(...)

Create api key custom authorizer:

from b_cfn_custom_api_key_authorizer.custom_authorizer import ApiKeyCustomAuthorizer

authorizer = ApiKeyCustomAuthorizer(
    scope=Stack(...),
    name='MyCoolAuthorizer',
    api=api,
)

Use that authorizer to protect your routes (endpoints):

from aws_cdk.aws_apigatewayv2 import CfnRoute

route = CfnRoute(
    scope=Stack(...),
    id='DummyRoute',
    api_id=api.ref,
    route_key='GET /dummy/endpoint',
    authorization_type='CUSTOM',
    target=f'integrations/{integration.ref}',
    authorizer_id=authorizer.ref
)

Once your infrastructure is deployed, try calling your api endpoint. You will get "Unauthorized" error.

import urllib3

response = urllib3.PoolManager().request(
    method='GET',
    url='https://your-api-url/dummy/endpoint',
    headers={},
)

>>> response.status
>>> 401

Create ApiKey and ApiSecret by invoking a dedicated api keys generator lambda function:

# Your supplied name for the "ApiKeyCustomAuthorizer".
authorizer_name = 'MyCoolAuthorizer'
# Created generator lambda function name.
function_name = 'GeneratorFunction'
# Full function name is a combination of both.
function_name = authorizer_name + function_name

response = boto3.client('lambda').invoke(
    FunctionName=function_name,
    InvocationType='RequestResponse',
)

response = json.loads(response['Payload'].read())
api_key = response['ApiKey']
api_secret = response['ApiSecret']

Now try calling the same api with api keys:

import urllib3

response = urllib3.PoolManager().request(
    method='GET',
    url='https://your-api-url/dummy/endpoint',
    headers={
        'ApiKey': api_key,
        'ApiSecret': api_secret
    },
)

>>> response.status
>>> 200

Testing

This package has integration tests based on pytest. To run tests simply run:

pytest b_cfn_custom_api_key_authorizer_test/integration/tests

Contribution

Found a bug? Want to add or suggest a new feature? Contributions of any kind are gladly welcome. You may contact us directly, create a pull-request or an issue in github platform. Lets modernize the world together.

Release history

1.1.0

• Create a dedicated lambda function to generate api keys. You should not interact with the database directly.

1.0.0

• Prod-ready version.
• Added documentation.
• Added more tests.
• Some code improvements.

0.1.0

• Initial testing done. Authorizer works.
• Need more tests and edge case handling before promoting to 1.0.0.

0.0.1

• Initial build.