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Edit File: webmin_suspend_hook.php

#!/opt/cpguard/cpg-php-fpm/bin/php
<?php

## DO NOT CUSTOMISE THIS FILE
## This file may be updated during software update
## Please make a copy of the file for customising it

sleep(2);
$input = json_decode($argv[1], true);
/*
    $input['emails']    - (array) Primary and secondary notification emails
    $input['user']      - (string) The user to be suspended
    $input['reason']    - (string) Reason for suspendsion
*/

if (!isUserSuspended($input['user'])) {

//Suspend the user
    suspendUser($input['user'], $input['reason']);

//Send a notification in slack
    //slack_notification($input);

//Send an email
    //send_email_notification($input);
}

function isUserSuspended($user)
{

//code to check if user is already suspended
    //Your code here...

}

function suspendUser($user, $reason)
{

//code to suspend user
    //Your code here...

#/usr/sbin/virtualmin modify-user --user=cpgnewera --disable

}

/* -------------------------------------------------------------------------
 *      SLACK WEBHOOKS
 *      REFER https://api.slack.com/messaging/webhooks
 * ---------------------------------------------------------------------- */

function slack_notification($input)
{

$server = gethostname();

//Update the webhook url below
    $webhook_url = "https://hooks.slack.com/services/xxxxxxxxxxxxxxx";

$data = array(
        "text" => $input['user'] . " account suspended! on $server",
        "blocks" => array(
            array(
                "type" => "section",
                "text" => array(
                    "type" => "mrkdwn",
                    "text" => "*" . $input['user'] . " account suspended! on $server*\nReason : " . $input['reason']
                )
            )
        )
    );

$data_string = json_encode($data);
    $ch = curl_init($webhook_url);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt(
        $ch,
        CURLOPT_HTTPHEADER,
        array(
            'Content-Type: application/json',
            'Content-Length: ' . strlen($data_string)
        )
    );

$result = curl_exec($ch);

}

/* -------------------------------------------------------------------------
 *      SENDING EMAILS TO END USERS
 * ---------------------------------------------------------------------- */

function send_email_notification($input)
{
    if (empty($input['emails'])) {
        echo "User email ids are not available. Email not sent";
        return false;
    }
    $server = gethostname();
    $to_address = implode(',', $input['emails']);
    $subject = $input['user'] . " account suspended on $server";

$message = "
    <html>
        <head>
            <title>" . $input['user'] . " account suspended on $server</title>
        </head>
        <body>
            <h2>" . $input['user'] . " account suspended on $server</h2>
            <p>Reason : " . $input['reason'] . "</p>
        </body>
    </html>
    ";

// Always set content-type when sending HTML email
    $headers = "MIME-Version: 1.0" . "\r\n";
    $headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";

// More headers
    $headers .= "From: cpguard@$server" . "\r\n";
    //$headers .= 'Cc: myboss@example.com' . "\r\n";

mail($to_address, $subject, $message, $headers);

}