serverless-domain-manager

Create custom domain names that your lambda can deploy to with serverless. Allows for base path mapping when deploying and deletion of domain names.

About Amplify

Amplify builds innovative and compelling digital educational products that empower teachers and students across the country. We have a long history as the leading innovator in K-12 education - and have been described as the best tech company in education and the best education company in tech. While others try to shrink the learning experience into the technology, we use technology to expand what is possible in real classrooms with real students and teachers.

Learn more at https://www.amplify.com

Getting Started

Prerequisites

Make sure you have the following installed before starting:

• nodejs
• npm
• serverless

The IAM role that is deploying the lambda will need the following permissions:

acm:ListCertificates                *
apigateway:GET                      /domainnames/*
apigateway:DELETE                   /domainnames/*
apigateway:POST                     /domainnames
apigateway:POST                     /domainnames/*/basepathmappings
cloudfront:UpdateDistribution       *
route53:ListHostedZones             *
route53:ChangeResourceRecordSets    hostedzone/{HostedZoneId}
route53:GetHostedZone               hostedzone/{HostedZoneId}
route53:ListResourceRecordSets      hostedzone/{HostedZoneId}

CloudFormation

Alternatively you can generate an least privileged IAM Managed Policy for deployment with this:

deployment policy cloudformation template

Installing

# From npm (recommended)
npm install serverless-domain-manager --save-dev

Then make the following edits to your serverless.yaml file:

Add the plugin.

plugins:
  - serverless-domain-manager

Add the plugin configuration (example for serverless.foo.com/api).

custom:
  customDomain:
    domainName: serverless.foo.com
    stage: ci
    basePath: api
    certificateName: *.foo.com
    createRoute53Record: true
    endpointType: 'regional'

Parameter Name	Default Value	Description
domainName (Required)		The domain name to be created in API Gateway and Route53 (if enabled) for this API.
basePath	(none)	The base path that will prepend all API endpoints.
stage	Value of --stage, or provider.stage (serverless will default to dev if unset)	The stage to create the domain name for. This parameter allows you to specify a different stage for the domain name than the stage specified for the serverless deployment.
certificateName	Closest match	The name of a specific certificate from Certificate Manager to use with this API. If not specified, the closest match will be used (i.e. for a given domain name api.example.com, a certificate for api.example.com will take precedence over a *.example.com certificate). Note: Edge-optimized endpoints require that the certificate be located in us-east-1 to be used with the CloudFront distribution.
createRoute53Record	true	Toggles whether or not the plugin will create a CNAME record in Route53 mapping the domainName to the generated distribution domain name.
endpointType	edge	Defines the endpoint type, accepts regional or edge.
hostedZoneId		If hostedZoneId is set the route53 record set will be created in the matching zone, otherwise the hosted zone will be figured out from the domainName (hosted zone with matching domain). Setting this parameter is specially useful if you have multiple hosted zones with the same domain name (e.g. a public and a private one)
enabled	true	Sometimes there are stages for which is not desired to have custom domain names. This flag allows the developer to disable the plugin for such cases. Accepts only boolean values and defaults to true for backwards compatibility.

Running

To create the custom domain:

serverless create_domain

To deploy with the custom domain:

severless deploy

To remove the created custom domain:

serverless delete_domain

How it works

Creating the custom domain takes advantage of Amazon's Certificate Manager to assign a certificate to the given domain name. Based on already created certificate names, the plugin will search for the certificate that resembles the custom domain's name the most and assign the ARN to that domain name. The plugin then creates the proper A Alias records for the domain through Route 53. Once the domain name is set it takes up to 40 minutes before it is initialized. After the certificate is initialized, sls deploy will create the base path mapping and assign the lambda to the custom domain name through CloudFront.

Running Tests

To run the test:

npm test

All tests should pass.

If there is an error update the node_module inside the serverless-vpc-discovery folder:

npm install

Known Issues

• (5/23/2017) CloudFormation does not support changing the base path from empty to something or vice a versa. You must run sls remove to remove the base path mapping.
• (1/17/2018) The create_domain command provided by this plugin does not currently update an existing Custom Domain's configuration. Instead, it only supports updating the Route 53 record pointing to the Custom Domain. For example, one must delete and recreate a Custom Domain to migrate it from regional to edge or vice versa, or to modify the certificate.

Responsible Disclosure

If you have any security issue to report, contact project maintainers privately. You can reach us at [email protected]

Contributing

We welcome pull requests! For your pull request to be accepted smoothly, we suggest that you:

1. For any sizable change, first open a GitHub issue to discuss your idea.
2. Create a pull request. Explain why you want to make the change and what it’s for. We’ll try to answer any PR’s promptly.