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