wp-feedburner.php

<?php
/*
Plugin Name: FeedBurner
Plugin URI: https://github.com/turadg/wp-feedburner
Description: Detects all ways to access your original WordPress feeds and redirects them to your FeedBurner feed so you can track every possible subscriber. Originally authored by <a href="http://www.orderedlist.com/">Steve Smith</a>. Categories added by <a href="http://interfacelab.com/feedburner-wp-plugin-fix/">InterfaceLab</a>.
Author: Turadg Aleahmad
Author URI: http://turadg.aleahmad.net/
Version: 2.4.0 beta 1
*/

$category_count=10;

$data = array(
	'feedburner_url'		=> '',
	'feedburner_comments_url'	=> ''
);

$ol_flash = '';

function ol_is_authorized() {
	global $user_level;
	if (function_exists("current_user_can")) {
		return current_user_can('activate_plugins');
	} else {
		return $user_level > 5;
	}
}

add_option('feedburner_settings',$data,'FeedBurner Feed Replacement Options');

$feedburner_settings = get_option('feedburner_settings');

function fb_is_hash_valid($form_hash) {
	$ret = false;
	$saved_hash = fb_retrieve_hash();
	if ($form_hash === $saved_hash) {
		$ret = true;
	}
	return $ret;
}

function fb_generate_hash() {
	return md5(uniqid(rand(), TRUE));
}

function fb_store_hash($generated_hash) {
	return update_option('feedsmith_token',$generated_hash,'FeedSmith Security Hash');
}

function fb_retrieve_hash() {
	$ret = get_option('feedsmith_token');
	return $ret;
}

function ol_add_feedburner_options_page() {
	if (function_exists('add_options_page')) {
		add_options_page('FeedBurner', 'FeedBurner', 8, basename(__FILE__), 'ol_feedburner_options_subpanel');
	}
}

function ol_feedburner_options_subpanel() {
	global $ol_flash, $feedburner_settings, $_POST, $wp_rewrite, $category_count;
	$cats=get_categories();

	if (!ol_is_authorized()) {
	  echo '<div class="wrap"><p>Sorry, you are not allowed to access this page.</p></div>';
		return;
	}
		
	$updates_cats=array();
	
	foreach($cats as $cat)
	{
		$field='feedburner_category_'.$cat->slug;
		
		if (isset($_POST[$field]))
			$updated_cats[$field]=$_POST[$field];
	}
	
	// Easiest test to see if we have been submitted to
	if(isset($_POST['feedburner_url']) || isset($_POST['feedburner_comments_url']) || (count($updated_cats)>0)) {
		// Now we check the hash, to make sure we are not getting CSRF
		if (fb_is_hash_valid($_POST['token'])) {

			// update the category feeds
			if (count($updated_cats)>0)
				foreach($updated_cats as $key=>$val)
				{
					$feedburner_settings[$key] = $val;
					update_option('feedburner_settings',$feedburner_settings);
					$ol_flash = "Your settings have been saved.";
				}
				
			if (isset($_POST['feedburner_url'])) { 
				$feedburner_settings['feedburner_url'] = $_POST['feedburner_url'];
				update_option('feedburner_settings',$feedburner_settings);
				$ol_flash = "Your settings have been saved.";
			}
			if (isset($_POST['feedburner_comments_url'])) { 
				$feedburner_settings['feedburner_comments_url'] = $_POST['feedburner_comments_url'];
				update_option('feedburner_settings',$feedburner_settings);
				$ol_flash = "Your settings have been saved.";
			} 
		} else {
			// Invalid form hash, possible CSRF attempt
			$ol_flash = "Security hash missing.";
		} // endif fb_is_hash_valid
	} // endif isset(feedburner_url)
	
	if ($ol_flash != '') echo '<div id="message" class="updated fade"><p>' . $ol_flash . '</p></div>';
	
	$temp_hash = fb_generate_hash();
	fb_store_hash($temp_hash);
	?>
<div class="wrap">
<h2>Set Up Your FeedBurner Feed</h2>
<p>This plugin makes it easy to redirect 100% of traffic for your feeds to a FeedBurner feed you have created. FeedBurner can then track all of your feed subscriber traffic and usage and apply a variety of features you choose to improve and enhance your original WordPress feed.</p>
<form action="" method="post">
<input type="hidden" name="redirect" value="true" />
<input type="hidden" name="token" value="<?=fb_retrieve_hash()?>" />
<ol>
<li>To get started, <a href="http://feedburner.google.com/fb/a/myfeeds" target="_blank">create a FeedBurner feed</a> for <tt><?=get_bloginfo('name')?></tt>. This feed will handle all traffic for your posts.</li>
<li>Once you have created your FeedBurner feed, enter its address into the field below (http://feeds.feedburner.com/yourfeed):<br/>
<input type="text" name="feedburner_url" value="<?=htmlentities($feedburner_settings['feedburner_url'])?>" size="45" />
</li>
  <?
	foreach($cats as $cat)
		echo "<li><strong>$cat->name</strong> Feed:<br/><input type=\"text\" name=\"feedburner_category_$cat->slug\" value=\"" . htmlentities($feedburner_settings['feedburner_category_'.$cat->slug]) . "\" size=\"45\" /></li>";
	echo '<li>Optional: If you also want to handle your WordPress comments feed using FeedBurner, <a href="https://www.feedburner.com/fb/a/addfeed?sourceUrl=' . get_bloginfo('url') . '/wp-commentsrss2.php" target="_blank">create a FeedBurner comments feed</a> and then enter its address below:<br/><input type="text" name="feedburner_comments_url" value="' . htmlentities($feedburner_settings['feedburner_comments_url']) . '" size="45" />
	</ol>
	<p><input type="submit" value="Save" /></p></form>';
	echo '</div>';

}

function ol_feed_redirect() {
	global $wp, $feedburner_settings, $feed, $withcomments;
	if (is_feed() && $feed != 'comments-rss2' && !is_single() && $wp->query_vars['category_name'] == '' && ($withcomments != 1) && trim($feedburner_settings['feedburner_url']) != '') {
		if (function_exists('status_header')) status_header( 302 );
		header("Location:" . trim($feedburner_settings['feedburner_url']));
		header("HTTP/1.1 302 Temporary Redirect");
		exit();
	} 
	else if (is_feed() && $feed != 'comments-rss2' && !is_single() && $wp->query_vars['category_name'] != '' && ($withcomments != 1) && trim($feedburner_settings['feedburner_category_'.$wp->query_vars['category_name']]) != '') {
		if (function_exists('status_header')) status_header( 302 );
		header("Location:" . trim($feedburner_settings['feedburner_category_'.$wp->query_vars['category_name']]));
		header("HTTP/1.1 302 Temporary Redirect");
		exit();
	}
	elseif (is_feed() && ($feed == 'comments-rss2' || $withcomments == 1) && trim($feedburner_settings['feedburner_comments_url']) != '') {
		if (function_exists('status_header')) status_header( 302 );
		header("Location:" . trim($feedburner_settings['feedburner_comments_url']));
		header("HTTP/1.1 302 Temporary Redirect");
		exit();
	}
}

function ol_check_url() {
	global $feedburner_settings;
	switch (basename($_SERVER['PHP_SELF'])) {
		case 'wp-rss.php':
		case 'wp-rss2.php':
		case 'wp-atom.php':
		case 'wp-rdf.php':
			if (trim($feedburner_settings['feedburner_url']) != '') {
				if (function_exists('status_header')) status_header( 302 );
				header("Location:" . trim($feedburner_settings['feedburner_url']));
				header("HTTP/1.1 302 Temporary Redirect");
				exit();
			}
			break;
		case 'wp-commentsrss2.php':
			if (trim($feedburner_settings['feedburner_comments_url']) != '') {
				if (function_exists('status_header')) status_header( 302 );
				header("Location:" . trim($feedburner_settings['feedburner_comments_url']));
				header("HTTP/1.1 302 Temporary Redirect");
				exit();
			}
			break;
	}
}

if (!preg_match("/feedburner|feedvalidator/i", $_SERVER['HTTP_USER_AGENT'])) {
	add_action('template_redirect', 'ol_feed_redirect');
	add_action('init','ol_check_url');
}

add_action('admin_menu', 'ol_add_feedburner_options_page');

/* Subscription Widget */

/* Add our function to the widgets_init hook. */
add_action( 'widgets_init', 'feedburner_loadwidgets' );

/* Function that registers our widget. */
function feedburner_loadwidgets() {
  require_once('widgets/feedburner_subscribe_widget.php');
	register_widget( 'FeedBurner_Subscribe_Widget' );
}



?>