BuddyPress/BuddyBoss: Prevent non-members from posting to activity feed or reacting to activity.

my-pmpro-bp-member-only-activity.php

<?php
/**
 * BuddyPress/BuddyBoss: Prevent non-members from posting, commenting on, or liking activity.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

/**
 * Block new activity updates and comments from users without a membership level.
 */
function my_pmpro_bp_activity_only_members_can_post( $activity ) {

	// Only gate brand-new posts, not edits to existing ones.
	if ( ! empty( $activity->id ) ) {
		return;
	}

	// Only gate user-authored activity, never programmatic activity.
	if ( ! in_array( $activity->type, array( 'activity_update', 'activity_comment' ), true ) ) {
		return;
	}

	// Bail if PMPro is not active or there is no user to check.
	if ( ! function_exists( 'pmpro_hasMembershipLevel' ) || empty( $activity->user_id ) ) {
		return;
	}

	// Never lock out admins and moderators, who often have no membership level.
	if ( user_can( $activity->user_id, 'bp_moderate' ) ) {
		return;
	}

	// Check the level of the user the activity belongs to, not the current user:
	// the two differ for admin actions, cron, WP-CLI and other programmatic saves.
	if ( pmpro_hasMembershipLevel( null, $activity->user_id ) ) {
		return;
	}

	// Block activity.
	$activity->error_type = 'wp_error';
	$activity->errors->add(
		'my_activity_blocked',
		'You must have a membership level to post activity.'
	);
}
add_action( 'bp_activity_before_save', 'my_pmpro_bp_activity_only_members_can_post' );

/**
 * Hide the comment link/form on activity items from users without a membership level.
 */
function my_pmpro_bp_activity_only_members_can_comment( $can_comment ) {

	// Bail if the user is already blocked from commenting.
	if ( ! $can_comment ) {
		return $can_comment;
	}

	// Bail if PMPro is not active.
	if ( ! function_exists( 'pmpro_hasMembershipLevel' ) ) {
		return $can_comment;
	}

	// Never lock out admins and moderators.
	if ( current_user_can( 'bp_moderate' ) ) {
		return $can_comment;
	}

	// If the user does not have a membership, disable commenting.
	if ( ! pmpro_hasMembershipLevel() ) {
		$can_comment = false;
	}

	return $can_comment;
}
add_filter( 'bp_activity_can_comment', 'my_pmpro_bp_activity_only_members_can_comment' );

/*
 * Disable BuddyBoss activity likes for non-members.
 */
function my_pmpro_bp_activity_only_members_can_like( $is_active ) {

	// Bail if the feature is already off, or PMPro is not active.
	if ( empty( $is_active ) || ! function_exists( 'pmpro_hasMembershipLevel' ) ) {
		return $is_active;
	}

	// Never lock out admins and moderators.
	if ( current_user_can( 'bp_moderate' ) ) {
		return $is_active;
	}

	if ( ! pmpro_hasMembershipLevel() ) {
		return false;
	}

	return $is_active;
}
add_filter( 'bp_is_activity_like_active', 'my_pmpro_bp_activity_only_members_can_like' );