Telegram Bot code to whitelist a member of private group - scripting

Question

I create a private supergroup in Telegram and want to only allow certain telegram userid or phone number to be able to join.
Any unknown telegram userid/number that is not in a whitelist file of the bot will be automatically kicked.
Maybe store a whitelist in a file and run the bot in Cloud Server? There is an API to kick a member https://core.telegram.org/bots/api#kickchatmember but I don't know the webhook to trigger adding member event.
Anyone mind to code a telegram bot script for this? Sorry for inconvenience.

Answer 1

try this
<?php
$API_KEY = 'token';
define('API_KEY', $API_KEY);
function bot($method,$datas=[]){
$url = "https://api.telegram.org/bot" . API_KEY . "/" . $method;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $datas);
$res = curl_exec($ch);
if (curl_error($ch)) {
var_dump(curl_error($ch));
} else {
return json_decode($res);
}
}
$update = json_decode(file_get_contents('php://input'));
$message = $update->message;
$text = $message->text;
$chat_id = $message->chat->id;
$from_id = $message->from->id;
$new_member = $message->new_chat_member->id;
$memberid = file_get_contents('whitelist.txt'); //put userid in whitelist.txt
$whitelist = explode("\n", $memberid);
if ($new_member) {
if (!in_array($chat_id, $whitelist)) {
bot('kickChatMember',[
'chat_id'=>$chat_id,
'user_id'=>$message->new_chat_member->id]);
}
}