BBP_Default::ajax_subscription()

	public function ajax_subscription() {

		// Bail if subscriptions are not active
		if ( ! bbp_is_subscriptions_active() ) {
			bbp_ajax_response( false, __( 'Subscriptions are no longer active.', 'buddyboss' ), 300 );
		}

		// Bail if user is not logged in
		if ( ! is_user_logged_in() ) {
			bbp_ajax_response( false, __( 'Please login to subscribe to this discussion.', 'buddyboss' ), 301 );
		}

		// Get user and topic data
		$user_id = bbp_get_current_user_id();
		$id      = intval( $_POST['id'] );

		// Bail if user cannot add favorites for this user
		if ( ! current_user_can( 'edit_user', $user_id ) ) {
			bbp_ajax_response( false, __( 'You do not have permission to do this.', 'buddyboss' ), 302 );
		}

		// Get the topic
		$topic = bbp_get_topic( $id );

		// Bail if topic cannot be found
		if ( empty( $topic ) ) {
			bbp_ajax_response( false, __( 'The discussion could not be found.', 'buddyboss' ), 303 );
		}

		// Bail if user did not take this action
		if ( ! isset( $_POST['nonce'] ) || ! wp_verify_nonce( $_POST['nonce'], 'toggle-subscription_' . $topic->ID ) ) {
			bbp_ajax_response( false, __( 'Are you sure you meant to do that?', 'buddyboss' ), 304 );
		}

		// Take action
		$status = bbp_is_user_subscribed( $user_id, $topic->ID ) ? bbp_remove_user_subscription( $user_id, $topic->ID ) : bbp_add_user_subscription( $user_id, $topic->ID );

		// Bail if action failed
		if ( empty( $status ) ) {
			bbp_ajax_response( false, __( 'The request was unsuccessful. Please try again.', 'buddyboss' ), 305 );
		}

		// Put subscription attributes in convenient array
		$attrs = array(
			'topic_id' => $topic->ID,
			'user_id'  => $user_id
		);

		// Action succeeded
		bbp_ajax_response( true, bbp_get_user_subscribe_link( $attrs, $user_id, false ), 200 );
	}