lambda-edge-mobile-detect.js

'use strict';

exports.handler = (event, context, callback) => {
    
    const request = event.Records[0].cf.request;
        const headers = request.headers;
        if (request.uri === '/' || request.uri.indexOf('.') === -1){
            console.log(JSON.stringify(request));
            if (isDesktopOrTablet(headers)){
                console.log('desktop or tablet')
                request.uri = '/index.html';
            } else {
                console.log('mobile')
               request.uri = '/index-mobile.html';
            }
            
        }
    
    callback(null, request);
};

function isDesktopOrTablet(headers){
    return (headers['cloudfront-is-desktop-viewer']
                   && headers['cloudfront-is-desktop-viewer'][0].value === 'true' ) ||
                   (headers['cloudfront-is-tablet-viewer']
                   && headers['cloudfront-is-tablet-viewer'][0].value === 'true' )
    
}