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-rw-r--r--plugins/OStatus/lib/linkheader.php63
1 files changed, 63 insertions, 0 deletions
diff --git a/plugins/OStatus/lib/linkheader.php b/plugins/OStatus/lib/linkheader.php
new file mode 100644
index 000000000..2f6c66dc9
--- /dev/null
+++ b/plugins/OStatus/lib/linkheader.php
@@ -0,0 +1,63 @@
+<?php
+
+class LinkHeader
+{
+ var $href;
+ var $rel;
+ var $type;
+
+ function __construct($str)
+ {
+ preg_match('/^<[^>]+>/', $str, $uri_reference);
+ //if (empty($uri_reference)) return;
+
+ $this->uri = trim($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 = $response->getHeader('Link');
+
+ // Can get an array or string, so try to simplify the path
+ if (!is_array($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;
+ }
+} \ No newline at end of file