Sibling Passwords Protection

sibling-passwords.php

<?php

add_filter( 'ppwp_pro_check_valid_password', 'ppwp_pro_check_valid_sibling_password', 20, 2 );

/**
 * Check valid sibling password.
 *
 * @param array $result The result after entering password including is_valid key.
 * @param array $params The options passed from the hook including
 *                      string password The password user entered.
 *                      int    parent_id The parent ID of current post or itself if it does not have parent.
 *                      array  current_roles The user's current roles.
 *                      int    post_id The current post ID.
 *
 * @return array
 */
function ppwp_pro_check_valid_sibling_password( $result, $params ) {

	if ( ! isset( $params['parent_id'] ) || ! isset( $params['post_id'] ) ) {
		return $result;
	}

	// If parent_id is same as post_id, it means
	// + The current post doesn't have the parent
	// + The option "Password Protect Child Pages" is off.
	if ( $params['parent_id'] === $params['post_id'] ) {
		// No child pages.
		return $result;
	}

	// Only accept password having label with format "Child:id1,id2,id3".
	$password_info = $result['password_info'];
	if ( empty( $password_info->label ) ) {
		$result['is_valid'] = false;

		return $result;
	}

	$tmp = explode( 'Child:', trim( $password_info->label ) );
	if ( count( $tmp ) < 2 ) {
		return $result;
	}

	$child_ids = array_map( 'intval', explode( ',', trim( $tmp[1] ) ) );
	$post_id   = (int) ppw_get_post_id_from_request();
	if ( ! in_array( $post_id, $child_ids, true ) ) {
		$result['is_valid'] = false;

		return $result;
	}


	return $result;
}