move linkheader.php to core

plugins/OStatus/lib/linkheader.php

@@ -1,66 +0,0 @@
-<?php
-/**
- * @todo Add file header and documentation.
- */
-
-class LinkHeader
-{
-    var $href;
-    var $rel;
-    var $type;
-
-    function __construct($str)
-    {
-        preg_match('/^<[^>]+>/', $str, $uri_reference);
-        //if (empty($uri_reference)) return;
-
-        $this->href = trim($uri_reference[0], '<>');
-        $this->rel = array();
-        $this->type = null;
-
-        // remove uri-reference from header
-        $str = substr($str, strlen($uri_reference[0]));
-
-        // parse link-params
-        $params = explode(';', $str);
-
-        foreach ($params as $param) {
-            if (empty($param)) continue;
-            list($param_name, $param_value) = explode('=', $param, 2);
-            $param_name = trim($param_name);
-            $param_value = preg_replace('(^"|"$)', '', trim($param_value));
-
-            // for now we only care about 'rel' and 'type' link params
-            // TODO do something with the other links-params
-            switch ($param_name) {
-            case 'rel':
-                $this->rel = trim($param_value);
-                break;
-
-            case 'type':
-                $this->type = trim($param_value);
-            }
-        }
-    }
-
-    static function getLink($response, $rel=null, $type=null)
-    {
-        $headers = $response->getHeader('Link');
-        if ($headers) {
-            // Can get an array or string, so try to simplify the path
-            if (!is_array($headers)) {
-                $headers = array($headers);
-            }
-
-            foreach ($headers as $header) {
-                $lh = new LinkHeader($header);
-
-                if ((is_null($rel) || $lh->rel == $rel) &&
-                    (is_null($type) || $lh->type == $type)) {
-                    return $lh->href;
-                }
-            }
-        }
-        return null;
-    }
-}