← All changes | modules/theme-tools/random-redirect.php +138 -0 16.2-beta → 16.3 View file →

		@@ -1,0 +1,138 @@
	1	+<?php
	2	+/**
	3	+ * Plugin Name: Random Redirect
	4	+ * Plugin URI: https://wordpress.org/extend/plugins/random-redirect/
	5	+ * Description: Allows you to create a link to yourblog.example.com/?random which will redirect someone to a random post on your blog, in a StumbleUpon-like fashion.
	6	+ * Version: 1.2-wpcom
	7	+ * Author: Matt Mullenweg
	8	+ * Author URI: https://ma.tt/
	9	+ * Text Domain: jetpack
	10	+ *
	11	+ * @package automattic/jetpack
	12	+ */
	13	+
	14	+// phpcs:disable WordPress.Security.NonceVerification -- No changes to the site here, it just redirects.
	15	+
	16	+/*
	17	+ * This module was removed from the plugin in 13.6 and restored in 16.1. In the meantime some themes
	18	+ * and plugins started shipping their own copy of the function below, so only declare it when nothing
	19	+ * else has, to avoid a fatal error. The declaration must stay inside this conditional: PHP binds
	20	+ * unconditional top-level function declarations when the file is compiled, before any check could run.
	21	+ */
	22	+if ( ! function_exists( 'jetpack_matt_random_redirect' ) ) {
	23	+ /**
	24	+ * Redirects to a random post on the site.
	25	+ */
	26	+ function jetpack_matt_random_redirect() {
	27	+ /**
	28	+ * Allows disabling the random redirect feature.
	29	+ *
	30	+ * @since 16.1
	31	+ *
	32	+ * @param bool $enabled Whether the random redirect feature is enabled. Default true.
	33	+ */
	34	+ if ( ! apply_filters( 'jetpack_random_redirect_enabled', true ) ) {
	35	+ return;
	36	+ }
	37	+
	38	+ // Verify that the Random Redirect plugin this code is from is not active
	39	+ // See https://plugins.trac.wordpress.org/ticket/1898
	40	+ if ( ! ( defined( 'IS_WPCOM' ) && IS_WPCOM ) ) {
	41	+ require_once ABSPATH . 'wp-admin/includes/plugin.php';
	42	+ if ( is_plugin_active( 'random-redirect/random-redirect.php' ) ) {
	43	+ return;
	44	+ }
	45	+ }
	46	+
	47	+ // Acceptable URL formats: /[...]/?random=[post type], /?random, /&random, /&random=1
	48	+ if ( ! isset( $_GET['random'] ) && ! ( isset( $_SERVER['REQUEST_URI'] ) && in_array( strtolower( $_SERVER['REQUEST_URI'] ), array( '/&random', '/&random=1' ), true ) ) ) {
	49	+ return;
	50	+ }
	51	+
	52	+ // Ignore POST requests.
	53	+ if ( ! empty( $_POST ) ) {
	54	+ return;
	55	+ }
	56	+
	57	+ // Persistent AppEngine abuse. ORDER BY RAND is expensive.
	58	+ if ( isset( $_SERVER['HTTP_USER_AGENT'] ) && strstr( filter_var( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ), 'AppEngine-Google' ) ) {
	59	+ wp_die( 'Please <a href="https://en.support.wordpress.com/contact/" rel="noopener noreferrer" target="_blank">contact support</a>' );
	60	+ }
	61	+
	62	+ $where = array(
	63	+ "post_password = ''",
	64	+ "post_status = 'publish'",
	65	+ );
	66	+ $where_args = array();
	67	+
	68	+ // Set default post type.
	69	+ $post_type = get_post_type();
	70	+
	71	+ // Change the post type if the parameter is set.
	72	+ if ( isset( $_GET['random_post_type'] ) && post_type_exists( sanitize_key( $_GET['random_post_type'] ) ) ) {
	73	+ $post_type = sanitize_key( $_GET['random_post_type'] );
	74	+ }
	75	+
	76	+ // Don't show a random page if 'page' isn't specified as the post type specifically.
	77	+ if ( 'page' === $post_type && is_front_page() && ! isset( $_GET['random_post_type'] ) ) {
	78	+ $post_type = 'post';
	79	+ }
	80	+
	81	+ $where[] = 'p.post_type = %s';
	82	+ $where_args[] = $post_type;
	83	+
	84	+ // Set author name if we're on an author archive.
	85	+ if ( is_author() ) {
	86	+ $where[] = 'post_author = %s';
	87	+ $where_args[] = get_the_author_meta( 'ID' );
	88	+ }
	89	+
	90	+ // Set default category type
	91	+ if ( is_category() ) {
	92	+ $category = get_the_category();
	93	+ if ( isset( $category ) && ! empty( $category ) ) {
	94	+ $random_cat_id = $category[0]->term_id;
	95	+ }
	96	+ }
	97	+
	98	+ // Set the category ID if the parameter is set.
	99	+ if ( isset( $_GET['random_cat_id'] ) ) {
	100	+ $random_cat_id = (int) $_GET['random_cat_id'];
	101	+ }
	102	+
	103	+ global $wpdb;
	104	+
	105	+ $where = implode( ' AND ', $where );
	106	+
	107	+ // Pick a post via COUNT plus a random OFFSET rather than ORDER BY RAND(), which randomizes and sorts every candidate row on each request.
	108	+ if ( isset( $random_cat_id ) ) {
	109	+ $from_where = "FROM $wpdb->posts AS p INNER JOIN $wpdb->term_relationships AS tr ON (p.ID = tr.object_id AND tr.term_taxonomy_id = %s) INNER JOIN $wpdb->term_taxonomy AS tt ON(tr.term_taxonomy_id = tt.term_taxonomy_id AND taxonomy = 'category') WHERE $where";
	110	+ $query_args = array_merge( array( $random_cat_id ), $where_args );
	111	+ } else {
	112	+ $from_where = "FROM $wpdb->posts AS p WHERE $where";
	113	+ $query_args = $where_args;
	114	+ }
	115	+
	116	+ // phpcs:ignore WordPress.DB.DirectDatabaseQuery, WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber, WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
	117	+ $post_count = (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT( DISTINCT p.ID ) $from_where", ...$query_args ) );
	118	+
	119	+ if ( $post_count < 1 ) {
	120	+ return;
	121	+ }
	122	+
	123	+ $query_args[] = wp_rand( 0, $post_count - 1 );
	124	+ // phpcs:ignore WordPress.DB.DirectDatabaseQuery, WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber, WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
	125	+ $random_id = $wpdb->get_var( $wpdb->prepare( "SELECT DISTINCT p.ID $from_where ORDER BY p.ID LIMIT 1 OFFSET %d", ...$query_args ) );
	126	+
	127	+ if ( ! $random_id ) {
	128	+ return;
	129	+ }
	130	+
	131	+ // @phan-suppress-next-line PhanTypeMismatchArgument
	132	+ $permalink = get_permalink( $random_id );
	133	+ wp_safe_redirect( $permalink );
	134	+ exit( 0 );
	135	+ }
	136	+
	137	+ add_action( 'template_redirect', 'jetpack_matt_random_redirect' );
	138	+}