1 files changed, 43 insertions, 0 deletions
diff --git a/plugins/jetpack/modules/random-redirect.php b/plugins/jetpack/modules/random-redirect.php
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+++ b/plugins/jetpack/modules/random-redirect.php
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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 matt_random_redirect() {
+	// Acceptables 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 requests that include more than just the random parameter.
+	if ( ! empty( $_POST ) || ( isset( $_GET['random'] ) && count( $_GET ) > 1 ) )
+		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/">contact support</a>' );
+
+	// Use the post type of the current page as the context for the random lookup.
+	$post_type = get_post_type();
+
+	// /?random should always show a random post, even if the home page is a static page.
+	if ( '/' == $_SERVER['DOCUMENT_URI'] )
+		$post_type = 'post';
+	else
+		$post_type = get_post_type();
+
+	if ( ! $post_type )
+		$post_type = 'post';
+
+	global $wpdb;
+	$random_id = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_type = %s AND post_password = '' AND post_status = 'publish' ORDER BY RAND() LIMIT 1", $post_type ) );
+	$permalink = get_permalink( $random_id );
+	wp_safe_redirect( $permalink );
+	exit;
+}
+
+add_action( 'template_redirect', 'matt_random_redirect' );