apps/bookmarks: follow redirects when fetching title

This solves a problem where hitting a redirect page would lead to a "302
Found" title.

Signed-off-by: Florian Pritz <bluewind@xinu.at>

apps/bookmarks/bookmarksHelper.php

@@ -1,5 +1,52 @@
 <?php
 
+// Source: http://www.php.net/manual/de/function.curl-setopt.php#102121
+// This works around a safe_mode/open_basedir restriction
+function curl_exec_follow(/*resource*/ $ch, /*int*/ &$maxredirect = null) {
+	$mr = $maxredirect === null ? 5 : intval($maxredirect);
+	if (ini_get('open_basedir') == '' && ini_get('safe_mode' == 'Off')) {
+		curl_setopt($ch, CURLOPT_FOLLOWLOCATION, $mr > 0);
+		curl_setopt($ch, CURLOPT_MAXREDIRS, $mr);
+	} else {
+		curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
+		if ($mr > 0) {
+			$newurl = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
+
+			$rch = curl_copy_handle($ch);
+			curl_setopt($rch, CURLOPT_HEADER, true);
+			curl_setopt($rch, CURLOPT_NOBODY, true);
+			curl_setopt($rch, CURLOPT_FORBID_REUSE, false);
+			curl_setopt($rch, CURLOPT_RETURNTRANSFER, true);
+			do {
+				curl_setopt($rch, CURLOPT_URL, $newurl);
+				$header = curl_exec($rch);
+				if (curl_errno($rch)) {
+					$code = 0;
+				} else {
+					$code = curl_getinfo($rch, CURLINFO_HTTP_CODE);
+					if ($code == 301 || $code == 302) {
+						preg_match('/Location:(.*?)\n/', $header, $matches);
+						$newurl = trim(array_pop($matches));
+					} else {
+						$code = 0;
+					}
+				}
+			} while ($code && --$mr);
+			curl_close($rch);
+			if (!$mr) {
+				if ($maxredirect === null) {
+					trigger_error('Too many redirects. When following redirects, libcurl hit the maximum amount.', E_USER_WARNING);
+				} else {
+					$maxredirect = 0;
+				}
+				return false;
+			}
+			curl_setopt($ch, CURLOPT_URL, $newurl);
+		}
+	}
+	return curl_exec($ch);
+}
+
 function getURLMetadata($url) {
 	//allow only http(s) and (s)ftp
 	$protocols = '/^[hs]{0,1}[tf]{0,1}tp[s]{0,1}\:\/\//i';
@@ -12,7 +59,7 @@ function getURLMetadata($url) {
 	$ch = curl_init();
 	curl_setopt($ch, CURLOPT_URL, $url);
 	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
-	$page = curl_exec($ch);
+	$page = curl_exec_follow($ch);
 	curl_close($ch);
 
 	@preg_match( "/<title>(.*)<\/title>/si", $page, $match );