| 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: http://photomatt.net/ |
| 9 |
*/ |
| 10 |
|
| 11 |
function jetpack_matt_random_redirect() { |
| 12 |
// Verify that the Random Redirect plugin this code is from is not active |
| 13 |
// See http://plugins.trac.wordpress.org/ticket/1898 |
| 14 |
if ( ! ( defined( 'IS_WPCOM' ) && IS_WPCOM ) ) { |
| 15 |
require_once( ABSPATH . 'wp-admin/includes/plugin.php' ); |
| 16 |
if ( is_plugin_active( 'random-redirect/random-redirect.php' ) ) return; |
| 17 |
} |
| 18 |
|
| 19 |
// Set default post type. |
| 20 |
$post_type = get_post_type(); |
| 21 |
|
| 22 |
// Set default category type |
| 23 |
if ( is_category() ) { |
| 24 |
$category = get_the_category(); |
| 25 |
if ( isset( $category ) && ! empty( $category ) ) { |
| 26 |
$random_cat_id = $category[0]->term_id; |
| 27 |
} |
| 28 |
} |
| 29 |
|
| 30 |
// Set author name if we're on an author archive. |
| 31 |
if ( is_author() ) { |
| 32 |
$random_author_name = get_the_author_meta( 'user_login' ); |
| 33 |
$random_author_query = 'AND user_login = "' . $random_author_name . '"'; |
| 34 |
} else { |
| 35 |
$random_author_query = ''; |
| 36 |
} |
| 37 |
|
| 38 |
// Acceptable URL formats: /[...]/?random=[post type], /?random, /&random, /&random=1 |
| 39 |
if ( ! isset( $_GET['random'] ) && ! in_array( strtolower( $_SERVER['REQUEST_URI'] ), array( '/&random', '/&random=1' ) ) ) |
| 40 |
return; |
| 41 |
|
| 42 |
// Ignore POST requests. |
| 43 |
if ( ! empty( $_POST ) ) |
| 44 |
return; |
| 45 |
|
| 46 |
// Persistent AppEngine abuse. ORDER BY RAND is expensive. |
| 47 |
if ( strstr( $_SERVER['HTTP_USER_AGENT'], 'AppEngine-Google' ) ) |
| 48 |
wp_die( 'Please <a href="http://en.support.wordpress.com/contact/" rel="noopener noreferrer" target="_blank">contact support</a>' ); |
| 49 |
|
| 50 |
// Set the category ID if the parameter is set. |
| 51 |
if ( isset( $_GET['random_cat_id'] ) ) |
| 52 |
$random_cat_id = (int) $_GET['random_cat_id']; |
| 53 |
|
| 54 |
// Change the post type if the parameter is set. |
| 55 |
if ( isset( $_GET['random_post_type'] ) && post_type_exists( $_GET['random_post_type'] ) ) |
| 56 |
$post_type = $_GET['random_post_type']; |
| 57 |
|
| 58 |
// Don't show a random page if 'page' isn't specified as the post type specifically. |
| 59 |
if ( 'page' === $post_type && is_front_page() && ! isset( $_GET['random_post_type'] ) ) { |
| 60 |
$post_type = 'post'; |
| 61 |
} |
| 62 |
|
| 63 |
global $wpdb; |
| 64 |
|
| 65 |
if ( isset( $random_cat_id ) ) { |
| 66 |
$random_id = $wpdb->get_var( $wpdb->prepare( "SELECT DISTINCT ID 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 p.post_type = %s AND post_password = '' AND post_status = 'publish' %s ORDER BY RAND() LIMIT 1", $random_cat_id, $post_type, $random_author_query ) ); |
| 67 |
} else { |
| 68 |
$random_id = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_type = %s AND post_password = '' AND post_status = 'publish' %s ORDER BY RAND() LIMIT 1", $post_type, $random_author_query ) ); |
| 69 |
} |
| 70 |
|
| 71 |
$permalink = get_permalink( $random_id ); |
| 72 |
wp_safe_redirect( $permalink ); |
| 73 |
exit; |
| 74 |
} |
| 75 |
|
| 76 |
add_action( 'template_redirect', 'jetpack_matt_random_redirect' ); |
| 77 |
|
