A Cloudformation Script to deploy an API Gateway Proxy

apigateway-proxy-cloudformation-template.yaml

# LICENSE https://creativecommons.org/licenses/by-nc-sa/3.0/
# https://cjohansen.no/aws-apigw-proxy-cloudformation/

AWSTemplateFormatVersion: 2010-09-09
Description: An API that proxies requests to another HTTP endpoint

Resources:
  Api:
    Type: 'AWS::ApiGateway::RestApi'
    Properties:
      Name: SomeProxyApi

  Resource:
    Type: 'AWS::ApiGateway::Resource'
    Properties:
      ParentId: !GetAtt Api.RootResourceId
      RestApiId: !Ref Api
      PathPart: '{proxy+}'

  RootMethod:
    Type: 'AWS::ApiGateway::Method'
    Properties:
      HttpMethod: ANY
      ResourceId: !GetAtt Api.RootResourceId
      RestApiId: !Ref Api
      AuthorizationType: NONE
      Integration:
        IntegrationHttpMethod: ANY
        Type: HTTP_PROXY
        Uri: http://my-imaginary-bucket.s3-website-eu-west-1.amazonaws.com/
        PassthroughBehavior: WHEN_NO_MATCH
        IntegrationResponses:
          - StatusCode: 200

  ProxyMethod:
    Type: 'AWS::ApiGateway::Method'
    Properties:
      HttpMethod: ANY
      ResourceId: !Ref Resource
      RestApiId: !Ref Api
      AuthorizationType: NONE
      RequestParameters:
        method.request.path.proxy: true
      Integration:
        CacheKeyParameters:
          - 'method.request.path.proxy'
        RequestParameters:
          integration.request.path.proxy: 'method.request.path.proxy'
        IntegrationHttpMethod: ANY
        Type: HTTP_PROXY
        Uri: http://my-imaginary-bucket.s3-website-eu-west-1.amazonaws.com/{proxy}
        PassthroughBehavior: WHEN_NO_MATCH
        IntegrationResponses:
          - StatusCode: 200

  Deployment:
    DependsOn:
      - RootMethod
      - ProxyMethod
    Type: 'AWS::ApiGateway::Deployment'
    Properties:
      RestApiId: !Ref Api
      StageName: !Ref StageName

script.sh

#!/usr/bin/env bash

H1='\033[96m'       # Light Cyan
OK='\033[0;32m'     # Green
NC='\033[0m'        # No Color

jq --version >/dev/null 2>&1 || { echo >&2 "I require jq utility but it's not installed. Aborting."; exit 1; }
aws --version >/dev/null 2>&1 || { echo >&2 "I require AWS CLI utility but it's not installed. Aborting."; exit 1; }

export EXPORT_VALUE=`aws cloudformation list-exports | jq .Exports | jq -r -c '.[] | select(.Name | contains("LogicExportID")).Value'`
export OUTPUT_VALUE="$(aws cloudformation describe-stacks --stack-name my-stack --region eu-west-1 --query 'Stacks[0].Outputs[?OutputKey==`RestApi`].OutputValue' --output text)"

aws cloudformation deploy --template-file apigateway-proxy-cloudformation-template.yaml --stack-name api-proxy-demo2 --parameter-overrides LBUri=$LB_URI