gabrielmerovingi/youtube-subscribe-unsubscribe

## youtube-subscribe-unsubscribe
/**
 * Insert YouTube Subscription Listening Script
 */
add_action( 'wp_head', 'mycred_insert_youtube_script' );
function mycred_insert_youtube_script() {

	if ( ! is_user_logged_in() ) return;
	$token = wp_create_nonce( 'mycred-youtube-sub' );

?>
<script type="text/javascript">
function mycredyoutubesub( payload ) {
	var xmlhttp;

    if (window.XMLHttpRequest) {
        // code for IE7+, Firefox, Chrome, Opera, Safari
        xmlhttp = new XMLHttpRequest();
    } else {
        // code for IE6, IE5
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }

    xmlhttp.open( "GET", "<?php echo admin_url( 'admin-ajax.php?action=mycred-youtube-subscribe' ); ?>&token=<?php echo $token; ?>&event=" + payload.eventType, true );
    xmlhttp.send();
}
</script>
<?php

}

/**
 * YouTube Subscribe / Unsubscribe AJAX Call Handler
 */
add_action( 'wp_ajax_mycred-youtube-subscribe', 'mycred_youtube_subscribe_unsubscribe' );
function mycred_youtube_subscribe_unsubscribe() {

	// Security
	check_ajax_referer( 'mycred-youtube-sub', 'token' );

	$event = $_GET['event'];
	$user_id = get_current_user_id();

	// Required
	if ( ! function_exists( 'mycred' ) || ! in_array( $event, array( 'subscribe', 'unsubscribe' ) ) ) wp_send_json_error();

	// Load myCRED
	$mycred = mycred();

	// Check for exlusion
	if ( $mycred->exclude_user( $user_id ) ) wp_send_json_error();

	// Subscription = give points
	if ( $event == 'subscribe' ) {

		// Give 10 points
		$mycred->add_creds(
			'youtube_subscription',
			$user_id,
			10,
			'%plural% for subscribing to our YouTube Channel'
		);

	}

	// Unsubscribe = lose points
	else {

		// Take 10 points
		$mycred->add_creds(
			'youtube_subscription',
			$user_id,
			-10,
			'Unsubscription from our YouTube Channel'
		);

	}

	wp_send_json_success();

}