send a message for cert renewal status

src/mailer.js

@@ -20,6 +20,8 @@ exports = module.exports = {
 
     outOfDiskSpace: outOfDiskSpace,
 
+    certificateRenewed: certificateRenewed,
+
     FEEDBACK_TYPE_FEEDBACK: 'feedback',
     FEEDBACK_TYPE_TICKET: 'ticket',
     FEEDBACK_TYPE_APP_MISSING: 'app_missing',
@@ -375,6 +377,20 @@ function outOfDiskSpace(message) {
     sendMails([ mailOptions ]);
 }
 
+function certificateRenewed(domain, message) {
+    assert.strictEqual(typeof domain, 'string');
+    assert.strictEqual(typeof message, 'string');
+
+    var mailOptions = {
+        from: config.adminEmail(),
+        to: 'admin@cloudron.io',
+        subject: util.format('[%s] Certificate was %s renewed', domain, message ? 'not' : ''),
+        text: render('certificate_renewed.ejs', { domain: domain, message: message, format: 'text' })
+    };
+
+    sendMails([ mailOptions ]);
+}
+
 // this function bypasses the queue intentionally. it is also expected to work without the mailer module initialized
 // crashnotifier should be able to send mail when there is no db
 function sendCrashNotification(program, context) {