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<?php
/*
Plugin Name: Random Redirect
Plugin URI: http://wordpress.org/extend/plugins/random-redirect/
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.
Version: 1.2-wpcom
Author: Matt Mullenweg
Author URI: http://photomatt.net/
*/
function jetpack_matt_random_redirect() {
// Verify that the Random Redirect plugin this code is from is not active
// See http://plugins.trac.wordpress.org/ticket/1898
if ( ! ( defined( 'IS_WPCOM' ) && IS_WPCOM ) ) {
require_once( ABSPATH . 'wp-admin/includes/plugin.php' );
if ( is_plugin_active( 'random-redirect/random-redirect.php' ) ) return;
}
// Set default post type.
$post_type = get_post_type();
// Set default category type
if ( is_category() ) {
$category = get_the_category();
if ( isset( $category ) && ! empty( $category ) ) {
$random_cat_id = $category[0]->term_id;
}
}
// Set author name if we're on an author archive.
if ( is_author() ) {
$random_author_name = get_the_author_meta( 'user_login' );
$random_author_query = 'AND user_login = "' . $random_author_name . '"';
}
// Acceptable URL formats: /[...]/?random=[post type], /?random, /&random, /&random=1
if ( ! isset( $_GET['random'] ) && ! in_array( strtolower( $_SERVER['REQUEST_URI'] ), array( '/&random', '/&random=1' ) ) )
return;
// Ignore POST requests.
if ( ! empty( $_POST ) )
return;
// Persistent AppEngine abuse. ORDER BY RAND is expensive.
if ( strstr( $_SERVER['HTTP_USER_AGENT'], 'AppEngine-Google' ) )
wp_die( 'Please <a href="http://en.support.wordpress.com/contact/" target="_blank">contact support</a>' );
// Set the category ID if the parameter is set.
if ( isset( $_GET['random_cat_id'] ) )
$random_cat_id = (int) $_GET['random_cat_id'];
// Change the post type if the parameter is set.
if ( isset( $_GET['random_post_type'] ) && post_type_exists( $_GET['random_post_type'] ) )
$post_type = $_GET['random_post_type'];
// Don't show a random page if 'page' isn't specified as the post type specifically.
if ( 'page' === $post_type && is_front_page() && ! isset( $_GET['random_post_type'] ) ) {
$post_type = 'post';
}
global $wpdb;
if ( isset( $random_cat_id ) ) {
$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 ) );
} else {
$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 ) );
}
$permalink = get_permalink( $random_id );
wp_safe_redirect( $permalink );
exit;
}
add_action( 'template_redirect', 'jetpack_matt_random_redirect' );
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