Handling HTTP/HTTPS redirection in a Lambda function

index.js

'use strict';

/****

Set up as a lambda function, it doesn't need any special permissions.

To test, you'll use a CloudFrontHTTPRedirect template.

Then, you'll create a CloudFront Distribution and attach this as a behavior.
Use the Event Type "ViewerRequest" to trigger it.

****/


exports.handler = (event, context, callback) => {
  /*
   * Generate HTTP redirect response with 301 status code and Location header.
   */
   
   const request = event.Records[0].cf.request;
   
   // get the original URL path
   const path = request.uri
   // set the new URL to redirect to
   const baseURI = 'https://example.com'
// construct the response
   const response = {
      status: '301',
      statusDescription: 'Found',
      headers: {
          location: [{
              key: 'Location',
              value: baseURI,
          }],
      },
  };
// Configure the URL redirects by building a new location 
//value using baseURI and path

  if (!path.match(/^\/wiki/))
    response.headers.location[0].value = baseURI + '/wiki' + path;
  else
    response.headers.location[0].value = baseURI + path;
    
  callback(null, response);
};