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Redirect to trailing slashes on CloudFront with AWS Lambda. (all this because S3 uses 302 redirects instead of 301)
'use strict';
const path = require('path')
exports.handler = (event, context, callback) => {
//get request object
const { request } = event.Records[0].cf
const url = request.uri;
//we need to determine if this request has an extension.
const extension = path.extname(url);
//path.extname returns an empty string when there's no extension.
//if there is an extension on this request, continue without doing anything!
if(extension && extension.length > 0){
return callback(null, request);
}
//there is no extension, so that means we want to add a trailing slash to the url.
//let's check if the last character is a slash.
const last_character = url.slice(-1);
//if there is already a trailing slash, return.
if(last_character === "/"){
return callback(null, request);
}
//add a trailing slash.
const new_url = `${url}/`;
//debug.
console.log(`Rewriting ${url} to ${new_url}...`);
//create HTTP redirect...
const redirect = {
status: '301',
statusDescription: 'Moved Permanently',
headers: {
location: [{
key: 'Location',
value: new_url,
}],
},
};
return callback(null, redirect);
};
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