Polling a Google Contacts change using an apps script - google-apps-script

Question

I need to detect change in my contacts book, unfortunately People API provides no such feature. I have read in some blogs polling is needed. I dont find any API to poll https://developers.google.com/contacts/v3/reference Can anyone suggest me how can this feature be achieved?

Answer 1

You can use this sort of function to receive and email if either the number of your contacts or the number of your contact emails change.
function sendEmailIfContactChange() {
const gObj = PropertiesService.getScriptProperties().getProperties();
const contacts=ContactsApp.getContacts();
var n=0;
contacts.forEach((c)=>{c.getEmails().forEach((e)=>{n++;});});
if(!gObj.hasOwnProperty('contacts')) {
gObj.contacts=contacts.length;
gObj.emails=n;
PropertiesService.getScriptProperties().setProperties(gObj);
return;
} else {
let pc = gObj.contacts;
let pe = gObj.emails;
gObj.contacts = contacts.length;
gObj.emails = n;
PropertiesService.getScriptProperties().setProperties(gObj);
if(pc != contacts.length || pe != n) {
GmailApp.sendEmail(gobj.globals.privateemail,'Contacts Have Change',`Old Contact: ${pc} New Contacts: ${contacts.length} \nOld Emails: ${pe} New Emails: ${n}`);
}
}
}
And you can create polling trigger like this:
function createPollingTrigger() {
const ts = ScriptApp.getProjectTriggers().map(t=>t.getHandlerFunction());
if(!~ts.indexOf('sendEmaiIfContactChange')) {
ScriptApp.newTrigger('sendEmailIfContactChange').timeBased().everyHours(2).create();
}
}