@aws-solutions-constructs/aws-cloudfront-apigateway-lambda

aws-cloudfront-apigateway-lambda module

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Reference Documentation:	https://docs.aws.amazon.com/solutions/latest/constructs/

Language	Package
Python	aws_solutions_constructs.aws_cloudfront_apigateway_lambda
Typescript	@aws-solutions-constructs/aws-cloudfront-apigateway-lambda
Java	software.amazon.awsconstructs.services.cloudfrontapigatewaylambda

Overview

This AWS Solutions Construct implements an AWS CloudFront fronting an Amazon API Gateway Lambda backed REST API.

Here is a minimal deployable pattern definition:

Typescript

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

new CloudFrontToApiGatewayToLambda(this, 'test-cloudfront-apigateway-lambda', {
  lambdaFunctionProps: {
    code: lambda.Code.fromAsset(`lambda`),
    runtime: lambda.Runtime.NODEJS_16_X,
    handler: 'index.handler'
  },
  apiGatewayProps: {
    defaultMethodOptions: {
      authorizationType: api.AuthorizationType.NONE
    }
  },
});

Python

from aws_solutions_constructs.aws_cloudfront_apigateway_lambda import CloudFrontToApiGatewayToLambda
from aws_cdk import (
  aws_lambda as _lambda,
  aws_apigateway as apigw,
  Stack
)
from constructs import Construct

        CloudFrontToApiGatewayToLambda(
            self, 'CloudFrontApiGatewayToLambda',
            lambda_function_props=_lambda.FunctionProps(
                runtime=_lambda.Runtime.PYTHON_3_7,
                code=_lambda.Code.from_asset('lambda'),
                handler='hello.handler',
            ),
            # NOTE - we use RestApiProps here because the actual type, LambdaRestApiProps requires
            # the handler function which does not yet exist. As RestApiProps is a subset of of LambdaRestApiProps
            # (although does not *extend* that interface) this works fine when the props object reaches the 
            # underlying TypeScript code that implements Constructs
            api_gateway_props=apigw.RestApiProps(
                default_method_options=apigw.MethodOptions(
                    authorization_type=apigw.AuthorizationType.NONE
                )
            )
        )

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.cloudfrontapigatewaylambda.*;
import software.amazon.awsconstructs.services.cloudfrontapigatewaylambda.CloudFrontToApiGatewayToLambdaProps;

new CloudFrontToApiGatewayToLambda(this, "ApiGatewayToLambdaPattern", new CloudFrontToApiGatewayToLambdaProps.Builder()
        .lambdaFunctionProps(new FunctionProps.Builder()
                .runtime(Runtime.NODEJS_16_X) // execution environment
                .code(Code.fromAsset("lambda")) // code loaded from the `lambda` directory (under root, next to `src`)
                .handler("hello.handler") // file is `hello`, function is `handler`
                .build())
        // NOTE - we use RestApiProps here because the actual type, LambdaRestApiProps requires
        // the handler function which does not yet exist. As RestApiProps is a subset of of LambdaRestApiProps
        // (although does not *extend* that interface) this works fine when the props object reaches the 
        // underlying TypeScript code that implements Constructs
        .apiGatewayProps(new RestApiProps.Builder()
                .defaultMethodOptions(new MethodOptions.Builder()
                        .authorizationType(AuthorizationType.NONE)
                        .build())
                .build())
        .build());

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	Optional user provided props to override the default props for the Lambda function.
apiGatewayProps?	api.LambdaRestApiProps	User provided props to override the default props for the API Gateway. As of release 2.48.0, clients must include this property with defaultMethodOptions: { authorizationType: string } specified. See Issue1043 in the github repo https://github.com/awslabs/aws-solutions-constructs/issues/1043
cloudFrontDistributionProps?	cloudfront.DistributionProps	Optional user provided props to override the default props for CloudFront Distribution
insertHttpSecurityHeaders?	boolean	Optional user provided props to turn on/off the automatic injection of best practice HTTP security headers in all responses from CloudFront
responseHeadersPolicyProps?	cloudfront.ResponseHeadersPolicyProps	Optional user provided configuration that cloudfront applies to all http responses.
logGroupProps?	logs.LogGroupProps	Optional user provided props to override the default props for for the CloudWatchLogs LogGroup.
cloudFrontLoggingBucketProps?	s3.BucketProps	Optional user provided props to override the default props for the CloudFront Logging Bucket.

Pattern Properties

Name	Type	Description
cloudFrontWebDistribution	cloudfront.Distribution	Returns an instance of cloudfront.Distribution created by the construct
cloudFrontFunction?	cloudfront.Function	Returns an instance of the Cloudfront function created by the pattern.
cloudFrontLoggingBucket	s3.Bucket	Returns an instance of the logging bucket for CloudFront Distribution.
apiGateway	api.RestApi	Returns an instance of the API Gateway REST API created by the pattern.
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.
lambdaFunction	lambda.Function	Returns an instance of the Lambda function created by the pattern.

Default settings

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

Amazon CloudFront

• Configure Access logging for CloudFront Distribution
• Enable automatic injection of best practice HTTP security headers in all responses from CloudFront Distribution

Amazon API Gateway

• Deploy a regional 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 NONE
• 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

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