Correct Simple Membership support

relevanssi-lib-common.php

<?php
// Replace the relevanssi_default_post_ok() function in the file lib/common.php with this:

/**
 * Checks whether the user is allowed to see the post.
 *
 * The default behaviour on 'relevanssi_post_ok' filter hook. Do note that while
 * this function takes $post_ok as a parameter, it actually doesn't care much
 * about the previous value, and will instead overwrite it. If you want to make
 * sure your value is preserved, either disable this default function, or run
 * your function on a later priority (this defaults to 10).
 *
 * Includes support for various membership plugins. Currently supports Members,
 * Groups, Simple Membership and s2member.
 *
 * @param boolean $post_ok Can the post be shown to the user.
 * @param int     $post_id The post ID.
 *
 * @return boolean $post_ok True if the user is allowed to see the post,
 * otherwise false.
 */
function relevanssi_default_post_ok( $post_ok, $post_id ) {
	$status = relevanssi_get_post_status( $post_id );

	// If it's not public, don't show.
	if ( 'publish' !== $status ) {
		$post_ok = false;
	}

	// Let's look a bit closer at private posts.
	if ( 'private' === $status ) {
		$post_ok = false;

		$type = relevanssi_get_post_type( $post_id );
		if ( isset( $GLOBALS['wp_post_types'][ $type ]->cap->read_private_posts ) ) {
			$cap = $GLOBALS['wp_post_types'][ $type ]->cap->read_private_posts;
		} else {
			// Just guessing here.
			$cap = 'read_private_' . $type . 's';
		}
		if ( current_user_can( $cap ) ) {
			// Current user has the required capabilities and can see the page.
			$post_ok = true;
		}

		if ( function_exists( 'members_can_current_user_view_post' ) ) {
			// Members.
			$post_ok = members_can_current_user_view_post( $post_id );
		}
	}

	if ( defined( 'GROUPS_CORE_VERSION' ) ) {
		// Groups.
		$current_user = wp_get_current_user();
		$post_ok      = Groups_Post_Access::user_can_read_post( $post_id, $current_user->ID );
	}
	if ( class_exists( 'MeprUpdateCtrl' ) && MeprUpdateCtrl::is_activated() ) {
		// Memberpress.
		$post = get_post( $post_id );
		if ( MeprRule::is_locked( $post ) ) {
			$post_ok = false;
		}
	}
	if ( defined( 'SIMPLE_WP_MEMBERSHIP_VER' ) ) {
		// Simple Membership.
		$access_ctrl = SwpmAccessControl::get_instance();
		$post        = get_post( $post_id );
		$post_ok     = $access_ctrl->can_i_read_post( $post );
	}

	/**
	 * Filters statuses allowed in admin searches.
	 *
	 * By default, admin searches may show posts that have 'draft', 'pending' and
	 * 'future' status (in addition to 'publish' and 'private'). If you use custom
	 * statuses and want them included in the admin search, you can add the statuses
	 * using this filter.
	 *
	 * @param array $statuses Array of statuses to accept.
	 */
	if ( in_array( $status, apply_filters( 'relevanssi_valid_admin_status', array( 'draft', 'pending', 'future' ) ), true ) && is_admin() ) {
		// Only show drafts, pending and future posts in admin search.
		$post_ok = true;
	}

	return $post_ok;
}