BuddyPress trick to disallow group activity comments or comment replies to non members of the group

bp-function-restrict-group-activity-comments.php

<?php
/*** beginning of the code to paste in the functions.php of your theme ***/


function imath_wants_you_to_be_in_group_to_comment_group_activities( $can_comment ) {
	global $activities_template;
	
	if( !is_super_admin() && $activities_template->activity->component == 'groups' && !groups_is_user_member( bp_loggedin_user_id(), $activities_template->activity->item_id ) )
		$can_comment = false;
	
	return $can_comment;
}

add_filter( 'bp_activity_can_comment', 'imath_wants_you_to_be_in_group_to_comment_group_activities', 10, 1 );

function imath_wants_you_to_be_in_group_to_reply_to_group_activity_comments( $can_reply, $comment ) {
	// We need to get the first commented activity to see if it belongs to a group :(
	$activities = bp_activity_get_specific( array( 'activity_ids' => $comment->item_id ) );
	
	$activity = $activities['activities'][0];
	
	if( !is_super_admin() && $activity->component == 'groups' && !groups_is_user_member( bp_loggedin_user_id(), $activity->item_id ) )
		$can_reply = false;
		
	return $can_reply;
}

add_filter( 'bp_activity_can_comment_reply', 'imath_wants_you_to_be_in_group_to_reply_to_group_activity_comments', 10, 2 );


/*** End of the code to paste ***/
?>