cloudfront-redirect-www

AWS Lambda@Edge function to redirect to the naked (non-www) version of a domain.

Assumes that both the www- and non-www variants are aliased to the CloudFront distribution.

Setup

IAM role creation

Create a new IAM role with the name aws-lambda-edge-execution-role and the following trust relationship:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": [
          "lambda.amazonaws.com",
          "edgelambda.amazonaws.com"
        ]
      },
      "Action": "sts:AssumeRole"
    }
  ]
}

Function configuration

Add the function code to a new AWS Lambda with the following configuration options:

Key	Value
Runtime	Node.js 8.10
Handler	index.handler
Role	aws-lambda-edge-execution-role
Memory	128 (MB)
Timeout	1 sec

Next publish a version of the function and copy its Lambda Function ARN.

CloudFront configuration

In the behavior settings of the CloudFront distribution, add a new Lambda Function Association with the Event Type Viewer Request and the Lambda Function ARN copied from the function configuration. Save your edits and wait until the new settings have been deployed.

License

Released under the MIT license.

Author

Jonathon Hill