aws-cloudfront-apigateway-lambda module

| 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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