From 35b88e29bf4748af7de0107c75f400d019f9c803 Mon Sep 17 00:00:00 2001
From: Olav Morken <olav.morken@uninett.no>
Date: Mon, 9 Jun 2008 08:04:58 +0000
Subject: [PATCH] Utilities: add resolveURL to resolve (possibly) relative
URLs.
git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@618 44740490-163a-0410-bde0-09ae8108e29a
---
lib/SimpleSAML/Utilities.php | 82 ++++++++++++++++++++++++++++++++++++
1 file changed, 82 insertions(+)
diff --git a/lib/SimpleSAML/Utilities.php b/lib/SimpleSAML/Utilities.php
index 17a344591..a46f31171 100644
--- a/lib/SimpleSAML/Utilities.php
+++ b/lib/SimpleSAML/Utilities.php
@@ -974,6 +974,88 @@ class SimpleSAML_Utilities {
return $ret;
}
+
+ /**
+ * Resolve a (possibly) relative URL relative to a given base URL.
+ *
+ * This function supports these forms of relative URLs:
+ * ^\w+: Absolute URL
+ * ^// Same protocol.
+ * ^/ Same protocol and host.
+ * ^? Same protocol, host and path, replace query string & fragment
+ * ^# Same protocol, host, path and query, replace fragment
+ * The rest: Relative to the base path.
+ *
+ * @param $url The relative URL.
+ * @param $base The base URL. Defaults to the base URL of this installation of simpleSAMLphp.
+ * @return An absolute URL for the given relative URL.
+ */
+ public static function resolveURL($url, $base = NULL) {
+ if($base === NULL) {
+ $config = SimpleSAML_Configuration::getInstance();
+ $base = self::selfURLhost() . '/' . $config->getBaseURL();
+ }
+
+
+ if(!preg_match('$^((((\w+:)//[^/]+)(/[^?#]*))(?:\?[^#]*)?)(?:#.*)?$', $base, $baseParsed)) {
+ throw new Exception('Unable to parse base url: ' . $base);
+ }
+
+ $baseDir = dirname($baseParsed[5] . 'filename');
+ $baseScheme = $baseParsed[4];
+ $baseHost = $baseParsed[3];
+ $basePath = $baseParsed[2];
+ $baseQuery = $baseParsed[1];
+
+ if(preg_match('$^\w+:$', $url)) {
+ return $url;
+ }
+
+ if(substr($url, 0, 2) === '//') {
+ return $baseScheme . $url;
+ }
+
+ $firstChar = substr($url, 0, 1);
+
+ if($firstChar === '/') {
+ return $baseHost . $url;
+ }
+
+ if($firstChar === '?') {
+ return $basePath . $url;
+ }
+
+ if($firstChar === '#') {
+ return $baseQuery . $url;
+ }
+
+
+ /* We have a relative path. Remove query string/fragment and save it as $tail. */
+ $queryPos = strpos($url, '?');
+ $fragmentPos = strpos($url, '#');
+ if($queryPos !== FALSE || $fragmentPos !== FALSE) {
+ if($queryPos === FALSE) {
+ $tailPos = $fragmentPos;
+ } elseif($fragmentPos === FALSE) {
+ $tailPos = $queryPos;
+ } elseif($queryPos < $fragmentPos) {
+ $tailPos = $queryPos;
+ } else {
+ $tailPos = $fragmentPos;
+ }
+
+ $tail = substr($url, $tailPos);
+ $dir = substr($url, 0, $tailPos);
+ } else {
+ $dir = $url;
+ $tail = '';
+ }
+
+ $dir = self::resolvePath($dir, $baseDir);
+
+ return $baseHost . $dir . $tail;
+ }
+
}
?>
\ No newline at end of file
--
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