plugin.php

<?php
/*
Plugin Name: Simple URLs
Plugin URI: http://www.studiopress.com/plugins/simple-urls
Description: Simple URLs is a complete URL management system that allows you create, manage, and track outbound links from your site by using custom post types and 301 redirects.
Version: 0.9.4
Author: Nathan Rice
Author URI: http://www.nathanrice.net/
*/
class SimpleURLs {
	
	// Constructor
	function __construct() {
		//register_activation_hook( __FILE__, 'flush_rewrite_rules' );
		
		add_action( 'init', array( &$this, 'register_post_type' ) );
		add_action( 'manage_posts_custom_column', array( &$this, 'columns_data' ) );
		add_filter( 'manage_edit-surl_columns', array( &$this, 'columns_filter' ) );
		add_action( 'admin_menu', array( &$this, 'add_meta_box' ) );
		add_action( 'save_post', array( &$this, 'meta_box_save' ), 1, 2 );
		add_action( 'template_redirect', array( &$this, 'count_and_redirect' ) );
	}
	
	// PHP4 Constructor
	function SimpleURLs() {
		$this->__construct();
	}
	
	function register_post_type() {
		
		register_post_type( 'surl',
			array(
				'labels' => array(
					'name' => __( 'Simple URLs' ),
					'singular_name' => __( 'URL' ),
					'add_new' => __( 'Add New' ),
					'add_new_item' => __( 'Add New URL' ),
					'edit' => __( 'Edit' ),
					'edit_item' => __( 'Edit URL' ),
					'new_item' => __( 'New URL' ),
					'view' => __( 'View URL' ),
					'view_item' => __( 'View URL' ),
					'search_items' => __( 'Search URL' ),
					'not_found' => __( 'No URLs found' ),
					'not_found_in_trash' => __( 'No URLs found in Trash' )
				),
				'public' => true,
				'query_var' => true,
				'menu_position' => 20,
				'supports' => array( 'title' ),
				'rewrite' => array( 'slug' => 'go', 'with_front' => false )
			)
		);
		
	}
	
	function columns_filter( $columns ) {
		
		$columns = array(
			'cb' => '<input type="checkbox" />',
			'title' => __('Title'),
			'url' => __('Redirect to'),
			'permalink' => __('Permalink'),
			'clicks' => __('Clicks')
		);
		
		return $columns;
		
	}
	
	function columns_data( $column ) {
		
		global $post;
		
		$url = get_post_meta($post->ID, '_surl_redirect', true);
		$count = get_post_meta($post->ID, '_surl_count', true);
		
		if ( $column == 'url' ) {
			echo make_clickable( esc_url( $url ? $url : '' ) );
		}
		elseif ( $column == 'permalink' ) {
			echo make_clickable( get_permalink() );
		}
		elseif ( $column == 'clicks' ) {
			echo esc_html( $count ? $count : 0 );
		}
		
	}
	
	function add_meta_box() {
		add_meta_box('surl', __('URL Information', 'surl'), array( &$this, 'meta_box' ), 'surl', 'normal', 'high');
	}
	
	function meta_box() {
		global $post;
		
		printf( '<input type="hidden" name="_surl_nonce" value="%s" />', wp_create_nonce( plugin_basename(__FILE__) ) );
		
		printf( '<p><label for="%s">%s</label></p>', '_surl_redirect', __('Redirect URI', 'surl') );
		printf( '<p><input style="%s" type="text" name="%s" id="%s" value="%s" /></p>', 'width: 99%;', '_surl_redirect', '_surl_redirect', esc_attr( get_post_meta( $post->ID, '_surl_redirect', true ) ) );
		
		$count = isset( $post->ID ) ? get_post_meta($post->ID, '_surl_count', true) : 0;
		printf( '<p>This URL has been accessed <b>%d</b> times.', esc_attr( $count ) );
		
	}
	
	function meta_box_save( $post_id, $post ) {
		
		$key = '_surl_redirect';
		
		//	verify the nonce
		if ( !isset($_POST['_surl_nonce']) || !wp_verify_nonce( $_POST['_surl_nonce'], plugin_basename(__FILE__) ) )
			return;
			
		//	don't try to save the data under autosave, ajax, or future post.
		if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) return;
		if ( defined('DOING_AJAX') && DOING_AJAX ) return;
		if ( defined('DOING_CRON') && DOING_CRON ) return;

		//	is the user allowed to edit the URL?
		if ( ! current_user_can( 'edit_posts' ) || $post->post_type != 'surl' )
			return;
			
		$value = isset( $_POST[$key] ) ? $_POST[$key] : '';
		
		if ( $value ) {
			//	save/update
			update_post_meta($post->ID, $key, $value);
		} else {
			//	delete if blank
			delete_post_meta($post->ID, $key);
		}
		
	}

	
	function count_and_redirect() {
		
		if ( !is_singular('surl') )
			return;

		global $wp_query;
		
		// Update the count
		$count = isset( $wp_query->post->ID ) ? get_post_meta($wp_query->post->ID, '_surl_count', true) : 0;
		update_post_meta( $wp_query->post->ID, '_surl_count', $count + 1 );

		// Handle the redirect
		$redirect = isset( $wp_query->post->ID ) ? get_post_meta($wp_query->post->ID, '_surl_redirect', true) : '';

		if ( !empty( $redirect ) ) {
			wp_redirect( esc_url_raw( $redirect ), 301);
			exit;
		}
		else {
			wp_redirect( home_url(), 302 );
			exit;
		}
		
	}
	
}

$SimpleURLs = new SimpleURLs;