Google Apps Script web endpoint to auto-validate AWS Certificates

aws_certificate_validation.gs

function doPost(event) {
    // Check script token
    var token = PropertiesService.getScriptProperties().getProperties().token || '';
    if (!event.parameter.token || event.parameter.token != token) {
        return ContentService.createTextOutput(JSON.stringify({ success: false, message: 'Invalid token' }))
            .setMimeType(ContentService.MimeType.JSON);
    }

    // Check domain parameter
    if (!event.parameter.domain) {
        return ContentService.createTextOutput(JSON.stringify({ success: false, message: 'Domain is required' }))
            .setMimeType(ContentService.MimeType.JSON);
    }

    // Check threads
    var threads = GmailApp.search('subject:certificate approval');
    if (threads.length == 0) {
        return ContentService.createTextOutput(JSON.stringify({ success: false, message: 'No threads to process' }))
            .setMimeType(ContentService.MimeType.JSON);
    }

    var links = []; threads.forEach(function(thread) {
        // Check messages
        var messages = thread.getMessages();
        if (messages.length == 0) {
            Logger.log('No messages to process'); return;
        }

        messages.forEach(function(message) {
            // Check domain match
            if (message.getSubject() != 'Certificate approval for '+event.parameter.domain) {
                Logger.log('Domain does not match'); return;
            }

            // Get approval link
            var link = ''; message.getBody().match(/<a ([^>]+)>/g).some(function(a) {
                if (/id="approval_url"/.test(a)) {
                    link = a.match(/href="([^"]+)"/)[1].replace(/&amp;/g, '&');
                    return true;
                }
            });
            if (link == '') {
                Logger.log('No approval link to process');
                message.moveToTrash(); return;
            }
            var context = link.match(/context=(.+)/)[1]
            var exists = links.some(function(eLink) {
                return context == eLink.match(/context=(.+)/)[1];
            });
            exists ? message.moveToTrash() : links.push(link);
        });
    });

    return ContentService.createTextOutput(JSON.stringify({ success: links.length>0, domain: event.parameter.domain, results: links }))
        .setMimeType(ContentService.MimeType.JSON);
}