Added an RSS news feed for blog posts

blog.php

@@ -69,6 +69,7 @@
 		global $pageTitle;
 		global $postUrl;
 		global $htmlHead;
+		global $CMS_RSS;
 		
 		$counters['figure'] = 1;
 		$counters['video'] = 1;
@@ -95,12 +96,12 @@
 
 			$blogentry->tags = explode(',', $blogentry->tags);
 			sort($blogentry->tags);
-			$blogentry->permalink = "?p=blog&b=" . str_replace("/", POSTS_DIR_SEP, $blogentry->file);
+			$blogentry->permalink = getServerUrl() . "/?p=blog&b=" . str_replace("/", POSTS_DIR_SEP, $blogentry->file);
 			$blogentry->isPublic = ($blogentry->status == "released");
 		}
 		$renderIt = $CMS_INDEXING || ($blogentry->status == "released") || ($blogentry->status == "unlisted");
 
-		if ($renderIt) {
+		if ($renderIt && !isset($CMS_RSS)) {
 			if (isset($postUrl) && !$CMS_INDEXING) { // Set meta information
 				$pageTitle = $blogentry->title;
 				$htmlHead .= '<meta name="description" content="' . $blogentry->description . '">
@@ -212,7 +213,8 @@
 	}
 	
 
-	echo "<blog>";
+	if (!isset($CMS_RSS))
+		echo "<blog>";
 	if (isset($postUrl)) { // Display post
 		$CMS_SINGLE_POST = true;
 		echo '<div class="post">';
@@ -227,21 +229,44 @@
 	else {
 		//echo "<h1>Blog posts</h1>";
 		if (isset($tagSearch)) {
-			echo "<h1 class=\"bloginfoheader\">Archive for '$tagSearch'</h1>";
+			echo "<h1 class=\"bloginfoheader\"><table border=0 style='width: 100%;'><tr><td>Archive for '$tagSearch'</td>";
+			if (RSS_ENABLED) {
+				echo '<td style="text-align:right;padding:6px; padding-bottom: 0px; "><a href="/rss.php?t=' . $tagSearch . '" title="RSS Feed for \'' . $tagSearch . '\'"><img src="img/rss.svg" style="width: 32px;"></a></td>';
+			}
+			echo '</tr></table></h1>';
 			$pageTitle = "Archive for '$tagSearch'";
 		}
+		if (isset($CMS_RSS) && RSS_SHOW_FULL) {
+			$CMS_SINGLE_POST = true;
+		}
 		$i = 0;
 		$morePosts = false;
 		foreach($posts as $k=>$v) {			
 			if ($v->isPublic) {
 				if (!isset($tagSearch) || in_array($tagSearch, $v->tags)) {
 					if ($i++ >= $postsSkip) {
-						//echo "<a href=\"$v->permalink\">$v->title by $v->author</a><br>";
+						if (isset($CMS_RSS)) {
-						echo '<div class="post">';
+							if (!isset($latestDisplayedPost)) {
-						require $v->includeFile;
+								$latestDisplayedPost = $v->ctime;
-						renderFooter();
+							}
-						echo "</div>";
+							echo '<item>
-						echo '<hr class="postSeparator">';
+	<title>' . $v->title . '</title>
+	<description><![CDATA[';
+  							require $v->includeFile;
+							renderFooter();
+ 							echo ']]></description>
+	<link><![CDATA[' . $v->permalink . ']]></link>
+	<guid isPermaLink="true"><![CDATA[' . $v->permalink . ']]></guid>
+	<pubDate>' . date($RSS_DATE_FORMAT, $v->ctime) . '</pubDate>
+	<dc:creator>' . $v->author . '</dc:creator>
+</item>';
+						} else {
+							echo '<div class="post">';
+							require $v->includeFile;
+							renderFooter();
+							echo "</div>";
+							echo '<hr class="postSeparator">';
+						}
 						if (($i % POSTS_PAGE_SIZE) == 0) {
 							$morePosts = true;
 							break;
@@ -259,5 +284,6 @@
 		if ($morePosts || $postsSkip > 0)
 			echo "</tr></table></p>";
 	}
-	echo "</blog>";
+	if (!isset($CMS_RSS))
+		echo "</blog>";
 ?>

img/rss.svg

@@ -0,0 +1,30 @@
+<svg viewBox="342 512 305 305" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" style="box-shadow: 0px 0px 4px #142532;">
+	<style type="text/css">
+		.rsslogo {
+			stroke: #142532;
+			fill: none;
+			fill-opacity: 1;
+			stroke-width: 20;
+		}
+		.rsslogo-ellipse {
+			fill: #142532;
+		}
+	</style>
+	<g>
+		<ellipse class="rsslogo rsslogo-ellipse" cx="450" cy="710" rx="30" ry="30"/>
+	</g>
+	<line class="rsslogo" x1="400" y1="580" x2="504" y2="580"/>
+	<line class="rsslogo" x1="580" y1="656" x2="580" y2="760"/>
+	<line class="rsslogo" x1="497" y1="577" x2="583" y2="663"/>
+	<line class="rsslogo" x1="400" y1="620" x2="484" y2="620"/>
+	<line class="rsslogo" x1="540" y1="676" x2="540" y2="760"/>
+	<line class="rsslogo" x1="477" y1="617" x2="543" y2="683"/>
+	<line class="rsslogo" x1="360" y1="530" x2="630" y2="530"/>
+	<line class="rsslogo" x1="360" y1="530" x2="360" y2="800"/>
+	<line class="rsslogo" x1="630" y1="530" x2="630" y2="800"/>
+	<line class="rsslogo" x1="360" y1="800" x2="630" y2="800"/>
+	<line class="rsslogo" x1="623" y1="527" x2="633" y2="537"/>
+	<line class="rsslogo" x1="357" y1="793" x2="367" y2="803"/>
+	<line class="rsslogo" x1="623" y1="803" x2="633" y2="793"/>
+	<line class="rsslogo" x1="357" y1="537" x2="367" y2="527"/>
+</svg>

index.php

@@ -71,9 +71,14 @@
 		<nav>
 			<div id="navContainer">
 				<ul class="pagetitle"><li <?php echo $homesel; ?> style="float: left;"><a class="pagetitle" href="/"><?php echo PAGE_NAME; ?></a></li></ul>
-		        <ul>
+		        	<ul>
 					<?php mkMenu(); ?>
-		        </ul>
+		        		<?php if (RSS_ENABLED) { ?>
+						<li style="float: right; margin: 10px;">
+							<a href="/rss.php" title="RSS Feed" style="margin: 0px; padding: 0px; border: none;"><img src="img/rss.svg" width="32px" height="32px"></a>
+						</li>
+					<?php } ?>
+				</ul>
 			</div>
 		</nav>
 	    <div id="contentContainer">

rss.php

@@ -0,0 +1,40 @@
+<?php
+	$CMS_ACTIVE = true;
+	$CMS_RSS = true;
+	
+	require_once "shared.php";
+	
+	if (RSS_ENABLED) {
+		header('Content-Type: application/rss+xml; charset=UTF-8');
+		
+		ob_start(function($output) {
+			global $tagSearch;
+			global $latestDisplayedPost;
+			$RSS_DATE_FORMAT = "D, d M Y H:i:s O";
+			if (!isset($latestDisplayedPost)) {
+				$latestDisplayedPost = time();
+			}
+			if ($tagSearch != "") {
+				$tagSearchTitle = " - Archive for '" . $tagSearch . "'";
+			} else {
+				$tagSearchTitle = "";
+			}
+		    	$output = '<?xml version="1.0" encoding="UTF-8" ?>
+	<?xml-stylesheet type="text/css" href="' . getServerUrl() . '/style.css" ?>
+	<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/">
+	<channel>
+		<title>' . PAGE_NAME . $tagSearchTitle . '</title>
+		<description><![CDATA[' . "Blog of " . PAGE_AUTHOR . $tagSearchTitle . ']]></description>
+		<link>' . getServerUrl() . '</link>
+		<lastBuildDate>' . date($RSS_DATE_FORMAT, $latestDisplayedPost) . '</lastBuildDate>
+		<pubDate>' . date($RSS_DATE_FORMAT, $latestDisplayedPost) . '</pubDate>
+		<ttl>' . RSS_REFRESH_INTERVAL . '</ttl>
+		<atom:link href="' . getServerUrl() . "/rss.php" . '" rel="self" type="application/rss+xml" />
+		' . $output;
+			return $output;
+		});
+	
+		require "blog.php";
+		echo '</channel></rss>';
+	}
+?>

shared.php

@@ -12,6 +12,10 @@
 	define('POSTS_MAX_FILENAME', 30);		// Maximum length of a post name (including suffix)
 	define('POSTS_TAG_SEARCH', 30);   		// Maximum length for the tag search argument
 	
+	define('RSS_ENABLED', true);			// Enable the RSS news feed
+	define('RSS_REFRESH_INTERVAL', 14400);		// Advertised update interval for the RSS feed
+	define('RSS_SHOW_FULL', false);			// Show extended section in RSS feed
+
 	$menuItems = array(
 		array("label" => "Page A",	"link" => "?p=00-template",			"highlight" => "related-subpages,00-template"),
 		array("label" => "Page B",  	"link" => "?p=404",		"highlight" => "404"),
@@ -135,4 +139,10 @@
 			return $counters['sources']++;
 		}
 	}
+	
+	function getServerUrl() {
+		$temp = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
+		$temp .= $_SERVER['HTTP_HOST'];
+		return $temp;
+	}
 ?>