Add custom date rules for Membership Pro

ms-custom-date-rules.php

<?php
/*
Plugin Name: MS - Custom Date rules
Plugin URI: https://premium.wpmudev.org/
Description: Add custom date rules for Membership Pro
Author: Panos Lyrakis @ WPMUDEV
Author URI: https://premium.wpmudev.org/
License: GPLv2 or later
*/

if( ! class_exists( 'WPMUDEV_MS_CDate_Rules' ) ){

		class WPMUDEV_MS_CDate_Rules
	{	
		private static $_instance = null;
		public $version;
		public static function get_instance() {
	        if ( is_null( self::$_instance ) ) {
	            self::$_instance = new WPMUDEV_MS_CDate_Rules();
	        }
	        return self::$_instance;
	    }
		
		private function __construct(){

			$this->version = '1.0';

			add_filter( 'ms_rule_has_access', array( $this, 'ms_rule_has_access' ), 10, 4 );
			
		}

		public function ms_rule_has_access( $access, $id, $rule_type, $MS_Rule ){				

			global $post;

			if( ! $post instanceof WP_Post || ! is_user_logged_in() ){
				return $access;
			}

			$current_user_id = get_current_user_id();			
			$user_revealed_pages = get_user_meta( $current_user_id, 'wpmudev-revealed-dripped-pages', true );

			if( is_array( $user_revealed_pages ) && in_array( $id, $user_revealed_pages ) ){
				return true;
			}

			if( ! is_array( $user_revealed_pages ) ){
				$user_revealed_pages = array();
			}

			$member = MS_Model_Member::get_current_member();

			$memberships = $MS_Rule->get_memberships( $id );

			if( ! is_array( $memberships ) || empty( $memberships ) ){
				return $access;
			}

			foreach( $memberships as $membership_id => $membership_name ){

				$membership = MS_Factory::load(
					'MS_Model_Membership',
					$membership_id
				);

				$is_drippet = $membership->is_dripped();

				if( $is_drippet ){

        			//Days to be used in the format:
					//	monday
					//	tuesday
					//	wednesday
					//	thursday
					//	friday
					//	saturday
					//	sunday
					$dripped_days_names = array(
						'monday',
						'wednesday',
						'friday',
						'sunday'
					);

					$avail_date = $MS_Rule->get_dripped_avail_date( $id );
					$now = MS_Helper_Period::current_date();

					if( strtotime( $avail_date ) > strtotime( $now ) ){
						return $access;
					}

					$subscription = $member->get_subscription( $membership_id );

					if( ! $subscription instanceof MS_Model_Relationship || ! isset( $subscription->start_date ) ){
						return $access;
					}

        			$subscription_start = new DateTime( $subscription->start_date . '00:00:00' );

					$datetime_now = DateTime::createFromFormat( 'd-m-Y', date( 'd-m-y', strtotime( $now ) ) );
					$today = strtolower( $datetime_now->format('l') );

					//Is today one of the allowed days?
					if( in_array( $today, $dripped_days_names ) ){

						$user_revealed_pages[] = $id;
						update_user_meta( $current_user_id, 'wpmudev-revealed-dripped-pages', $user_revealed_pages );
						return true;

					}

					foreach( $dripped_days_names as $day_name ){

						$date = new DateTime( date( 'Y-m-d', strtotime( $subscription_start->format( 'Y-m-d' ) ) ) );
						$date->modify( 'next ' . $day_name );

						$days_diff = ceil( ( strtotime( $date->format( 'Y-m-d' ) ) - time() ) / (60 * 60 * 24) );

					   	if( $days_diff <= 0 ){
					   		
					   		$user_revealed_pages[] = $id;
							update_user_meta( $current_user_id, 'wpmudev-revealed-dripped-pages', $user_revealed_pages );
							return true;
					   	}

					}

				}
				else{
					//If not dripped
					return $access;
				}
			}

			return false;
		}

	}

	add_action( 'plugins_loaded', function(){
		$GLOBALS['WPMUDEV_MS_CDate_Rules'] = WPMUDEV_MS_CDate_Rules::get_instance();
	}, 10 );

}