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cfn-api-gateway-method-response

v0.2.1

Published

Custom::ApiGatewayMethodResponse | AWS CloudFormation Custom Lambda Resource | API Gateway MethodResponse

Downloads

10

Readme

cfn-api-gateway-method-response

Purpose

AWS CloudFormation does not support AWS API Gateway. This is a Lambda-backed custom resource to add the AWS API Gateway's MethodResponse to CloudFormation.

This package on NPM
This package on GitHub

Implementation

This Lambda makes use of the Lambda-Backed CloudFormation Custom Resource flow module, cfn-lambda (GitHub / NPM).

Usage

See ./example.template.json for a sample CloudFormation template. The example uses Condition statements, Parameters, and dynamic ServiceToken generation fully.

"MethodResponseLogicalIdInResourcesObject": {
  "Type": "Type": "Custom::ApiGatewayMethodResponse",
  "Properties": {
    "ServiceToken": "arn:aws:lambda:<cfn-region-id>:<your-account-id>:function:<this-deployed-lambda-name>",
    "StatusCode": "200",  // REQUIRED String of Status Code for this method response.
    "RestApiId": "abcdefghij", // REQUIRED 10 char alphanum String ID for RestApi 
    "HttpMethod": "GET",  // REQUIRED enum DELETE, GET, HEAD, OPTIONS, PATCH, POST, PUT
    "ResourceId": "zyxwvutsrq"  // REQUIRED 10 char alphanum String ID for Resource,
    "ResponseModels": {                // Optional hash of key: value pairs, 
      "application/json": "ModelName"  //   key being a valid Content-Type,
      "text/xml": "AnotherModelName"   //   value a model name for the API
    },
    "ResponseParameters": {  // Optional hash of key: value pairs,
      "method.response.header.Expires": true,  // Key being a mapping,
      "method.response.header.fooparam": true  // value being a bool or bool string
    }
  }
}

Example Template Prerequisites

Though this resource works by itself, the example template in this repository also makes use of other resources in this custom family. You need to install these in your cloud to use the sample template.

  1. Custom::ApiGatewayRestApi (GitHub / NPM)
  2. Custom::ApiGatewayMethod (GitHub / NPM)

Installation of the Resource Service Lambda

Using the Provided Instant Install Script

The way that takes 10 seconds...

# Have aws CLI installed + permissions for IAM and Lamdba
$ npm run cfn-lambda-deploy

You will have this resource installed in every supported Region globally!

Using the AWS Console

... And the way more difficult way.

IMPORTANT: With this method, you must install this custom service Lambda in each AWS Region in which you want CloudFormation to be able to access the ApiGatewayMethodResponse custom resource!

  1. Go to the AWS Lambda Console Create Function view:
  1. Zip this repository into /tmp/ApiGatewayMethodResponse.zip

    $ cd $REPO_ROOT && zip -r /tmp/ApiGatewayMethodResponse.zip;

  2. Enter a name in the Name blank. I suggest: CfnLambdaResouce-ApiGatewayMethodResponse

  3. Enter a Description (optional).

  4. Toggle Code Entry Type to "Upload a .ZIP file"

  5. Click "Upload", navigate to and select /tmp/ApiGatewayMethodResponse.zip

  6. Set the Timeout under Advanced Settings to 10 sec

  7. Click the Role dropdown then click "Basic Execution Role". This will pop out a new window.

  8. Select IAM Role, then select option "Create a new IAM Role"

  9. Name the role lambda_cfn_api_gateway_method (or something descriptive)

  10. Click "View Policy Document", click "Edit" on the right, then hit "OK"

  11. Copy and paste the ./execution-policy.json document.

  12. Hit "Allow". The window will close. Go back to the first window if you are not already there.

  13. Click "Create Function". Finally, done! Now go to Usage or see the example template. Next time, stick to the instant deploy script.

Miscellaneous

Collaboration & Requests

Submit pull requests or Tweet @ayetempleton if you want to get involved with roadmap as well, or if you want to do this for a living :)

License

MIT

Want More CloudFormation or API Gateway?

Work is (extremely) active, published here:
Andrew's NPM Account