lambda redirect by language while request origin

gistfile1.txt

'use strict';

exports.handler = (event, context, callback) => {
    const request = event.Records[0].cf.request;
    const s3DomainName = 'static-jebai.s3.amazonaws.com';
    const countryCode = request.headers['cloudfront-viewer-country'][0].value.toLowerCase();
    const acceptLanguage = request.headers['accept-language'][0].value.toLowerCase();
    const isDesktop = request.headers['cloudfront-is-desktop-viewer'][0].value;
    const isMobile = request.headers['cloudfront-is-mobile-viewer'][0].value;
    const isSmarttv = request.headers['cloudfront-is-smarttv-viewer'][0].value;
    const isTablet = request.headers['cloudfront-is-tablet-viewer'][0].value;
    console.log("acceptLanguages ==> ", acceptLanguage);
    
    let language = "default";
    
    if (acceptLanguage && acceptLanguage !== '*') {
        const languages = acceptLanguage.split(',');
        console.log("languages ==> ", languages);
        if (languages && languages.length > 0) {
            language = languages[0].toLowerCase();
        }
    }
    console.log("language ==> ", language);
    
    if (language.indexOf('en') == 0) {
        language = 'en';
    }
    
    let device = "mobile";
    
    if (isDesktop || isSmarttv) {
        device = "desktop";
    } else if (isTablet || isMobile) {
        device = "mobile";
    }

    request.origin = {
        s3: {
            domainName: s3DomainName,
            region: '',
            authMethod: 'none',
            path: `/${language}/${device}`,
            customHeaders: {}
        }
    };
    request.headers['host'] = [{ key: 'host', value: s3DomainName }];
    callback(null, request);
};