aws-cognito-apigateway-lambda

Language	Package
Python	aws_solutions_constructs.aws_cognito_apigateway_lambda
Typescript	@aws-solutions-constructs/aws-cognito-apigateway-lambda
Java	software.amazon.awsconstructs.services.cognitoapigatewaylambda

Overview

This AWS Solutions Construct implements an Amazon Cognito securing an Amazon API Gateway Lambda backed REST APIs pattern.

Here is a minimal deployable pattern definition:

Typescript

import { Construct } from 'constructs';
import { Stack, StackProps } from 'aws-cdk-lib';
import { CognitoToApiGatewayToLambda } from '@aws-solutions-constructs/aws-cognito-apigateway-lambda';
import * as lambda from 'aws-cdk-lib/aws-lambda';

new CognitoToApiGatewayToLambda(this, 'test-cognito-apigateway-lambda', {
  lambdaFunctionProps: {
    code: lambda.Code.fromAsset(`lambda`),
    runtime: lambda.Runtime.NODEJS_16_X,
    handler: 'index.handler'
  }
});

Python

from aws_solutions_constructs.aws_cognito_apigateway_lambda import CognitoToApiGatewayToLambda
from aws_cdk import (
    aws_lambda as _lambda,
    Stack
)
from constructs import Construct

CognitoToApiGatewayToLambda(self, 'test-cognito-apigateway-lambda',
                            lambda_function_props=_lambda.FunctionProps(
                                code=_lambda.Code.from_asset('lambda'),
                                runtime=_lambda.Runtime.PYTHON_3_9,
                                handler='index.handler'
                            )
                            )

Java

import software.constructs.Construct;

import software.amazon.awscdk.Stack;
import software.amazon.awscdk.StackProps;
import software.amazon.awscdk.services.lambda.*;
import software.amazon.awscdk.services.lambda.Runtime;
import software.amazon.awsconstructs.services.cognitoapigatewaylambda.*;

new CognitoToApiGatewayToLambda(this, "test-cognito-apigateway-lambda",
        new CognitoToApiGatewayToLambdaProps.Builder()
                .lambdaFunctionProps(new FunctionProps.Builder()
                        .runtime(Runtime.NODEJS_16_X)
                        .code(Code.fromAsset("lambda"))
                        .handler("index.handler")
                        .build())
                .build());

If you are defining resources and methods on your API (e.g. proxy = false), then you must call addAuthorizers() after the API is fully defined to ensure every method is protected. Here is an example:

Typescript

import { Construct } from 'constructs';
import { Stack, StackProps } from 'aws-cdk-lib';
import { CognitoToApiGatewayToLambda } from '@aws-solutions-constructs/aws-cognito-apigateway-lambda';
import * as lambda from 'aws-cdk-lib/aws-lambda';

const construct = new CognitoToApiGatewayToLambda(this, 'test-cognito-apigateway-lambda', {
    lambdaFunctionProps: {
        code: lambda.Code.fromAsset(`lambda`),
        runtime: lambda.Runtime.NODEJS_16_X,
        handler: 'index.handler'
    },
    apiGatewayProps: {
        proxy: false
    }
});

const resource = construct.apiGateway.root.addResource('foobar');
resource.addMethod('POST');

// Mandatory to call this method to Apply the Cognito Authorizers on all API methods
construct.addAuthorizers();

Python

from aws_solutions_constructs.aws_cognito_apigateway_lambda import CognitoToApiGatewayToLambda
from aws_cdk import (
    aws_lambda as _lambda,
    aws_apigateway as api,
    Stack
)
from constructs import Construct
from typing import Any

# Overriding LambdaRestApiProps with type Any
gateway_props = dict[Any, Any]

construct = CognitoToApiGatewayToLambda(self, 'test-cognito-apigateway-lambda',
                                        lambda_function_props=_lambda.FunctionProps(
                                            code=_lambda.Code.from_asset(
                                                'lambda'),
                                            runtime=_lambda.Runtime.PYTHON_3_9,
                                            handler='index.handler'
                                        ),
                                        api_gateway_props=gateway_props(
                                            proxy=False
                                        )
                                        )

resource = construct.api_gateway.root.add_resource('foobar')
resource.add_method('POST')

# Mandatory to call this method to Apply the Cognito Authorizers on all API methods
construct.add_authorizers()

Java

import software.constructs.Construct;

import java.util.HashMap;
import java.util.Map;
import java.util.Optional;

import software.amazon.awscdk.*;
import software.amazon.awscdk.services.lambda.*;
import software.amazon.awscdk.services.lambda.Runtime;
import software.amazon.awscdk.services.apigateway.IResource;
import software.amazon.awsconstructs.services.cognitoapigatewaylambda.*;

// Overriding LambdaRestApiProps with type Any
Map<String, Optional<?>> gatewayProps = new HashMap<String, Optional<?>>();
gatewayProps.put("proxy", Optional.of(false));

final CognitoToApiGatewayToLambda construct = new CognitoToApiGatewayToLambda(this,
        "test-cognito-apigateway-lambda",
        new CognitoToApiGatewayToLambdaProps.Builder()
                .lambdaFunctionProps(new FunctionProps.Builder()
                        .runtime(Runtime.NODEJS_16_X)
                        .code(Code.fromAsset("lambda"))
                        .handler("index.handler")
                        .build())
                .apiGatewayProps(gatewayProps)
                .build());

final IResource resource = construct.getApiGateway().getRoot().addResource("foobar");
resource.addMethod("POST");

// Mandatory to call this method to Apply the Cognito Authorizers on all API methods
construct.addAuthorizers();

Pattern Construct Props

Name	Type	Description
existingLambdaObj?	lambda.Function	Existing instance of Lambda Function object, providing both this and lambdaFunctionProps will cause an error.
lambdaFunctionProps?	lambda.FunctionProps	User provided props to override the default props for the Lambda function.
apiGatewayProps?	api.LambdaRestApiProps	Optional user provided props to override the default props for API Gateway
cognitoUserPoolProps?	cognito.UserPoolProps	Optional user provided props to override the default props for Cognito User Pool
cognitoUserPoolClientProps?	cognito.UserPoolClientProps	Optional user provided props to override the default props for Cognito User Pool Client
logGroupProps?	logs.LogGroupProps	User provided props to override the default props for for the CloudWatchLogs LogGroup.

Pattern Properties

Name	Type	Description
userPool	cognito.UserPool	Returns an instance of cognito.UserPool created by the construct
userPoolClient	cognito.UserPoolClient	Returns an instance of cognito.UserPoolClient created by the construct
apiGateway	api.RestApi	Returns an instance of api.RestApi created by the construct
apiGatewayCloudWatchRole?	iam.Role	Returns an instance of the iam.Role created by the construct for API Gateway for CloudWatch access.
apiGatewayLogGroup	logs.LogGroup	Returns an instance of the LogGroup created by the construct for API Gateway access logging to CloudWatch.
apiGatewayAuthorizer	api.CfnAuthorizer	Returns an instance of the api.CfnAuthorizer created by the construct for API Gateway methods authorization.
lambdaFunction	lambda.Function	Returns an instance of lambda.Function created by the construct

Default settings

Out of the box implementation of the Construct without any override will set the following defaults:

Amazon Cognito

• Set password policy for User Pools

• Enforce the advanced security mode for User Pools

Amazon API Gateway

• Deploy an edge-optimized API endpoint

• Enable CloudWatch logging for API Gateway

• Configure least privilege access IAM role for API Gateway

• Set the default authorizationType for all API methods to Cognito User Pool

• Enable X-Ray Tracing

AWS Lambda Function

• Configure limited privilege access IAM role for Lambda function

• Enable reusing connections with Keep-Alive for NodeJs Lambda function

• Enable X-Ray Tracing

• Set Environment Variables

  • AWS_NODEJS_CONNECTION_REUSE_ENABLED (for Node 10.x and higher functions)

Architecture

GitHub

To view the code for this pattern, create/view issues and pull requests, and more:
	@aws-solutions-constructs/aws-cognito-apigateway-lambda