<?php
$magnetUri = 'magnet:?xt=urn:sha1:YNCKHTQCWBTRNJIV4WNAE52SJUQCZO5C';
echo 'Magnet URI demo: ', $magnetUri, "\n\n";
$mUri = new MagnetUri($magnetUri);
# Check if the mUri is valid:
echo ' valid: ', $mUri->isValid() ? 'Yes' : 'No', "\n";
# ->valid works as well:
echo ' valid: ', $mUri->valid ? 'Yes' : 'No', "\n\n";
# Access Parts of the URI by their name:
echo 'exactTopic: ', $mUri->exactTopic, "\n";
# Same for the parameter:
echo ' xt: ', $mUri->xt, "\n";
echo "\nString output:\n\n";
echo (string) $mUri;
/**
* MagnetUri
*
* Parser and validator for MagnetUris
*
* Supports the following parameters:
*
* @@support-params-start
* dn (Display Name) - Filename
* xl (eXact Length) - Size in bytes
* xt (eXact Topic) - URN containing file hash
* as (Acceptable Source) - Web link to the file online
* xs (eXact Source) - P2P link.
* kt (Keyword Topic) - Key words for search
* mt (Manifest Topic) - link to the metafile that contains a list of magneto (MAGMA - MAGnet MAnifest)
* tr (address TRacker) - Tracker URL for BitTorrent downloads
* @@support-params-end
*/
class MagnetUri {
private $def;
private $uri;
private $data;
private $valid=false;
private function initDefFromLines(array $lines) {
$state = 0;
foreach($lines as $line) {
if ($state) {
if ($line === ' * @@support-params-end') break;
$line = ltrim($line, '* ');
list($mix, $desc) = explode(' - ', $line);
list($key, $name) = explode(' ', $mix, 2);
$name = trim($name, '()');
$this->def['keys'][$key] = $name;
$norm = strtolower(str_replace(' ', '', $name));
$this->def['names'][$norm] = $key;
}
if ($line === ' * @@support-params-start') $state = 1;
}
if (!$state || null === $this->def) {
throw new Exception('Supported Params are undefined.');
}
}
private function init() {
$refl = new ReflectionClass($this);
$this->initDefFromLines(explode("\n", str_replace("\r", '', $refl->getDocComment())));
}
private function getKey($param) {
$param = strtolower($param);
$key = false;
if (isset($this->def['keys'][$param]))
$key = $param;
elseif (isset($this->def['names'][$param]))
$key = $this->def['names'][$param];
return $key;
}
public function __isset($name) {
return false !== $this->getKey($name);
}
public function __get($name) {
if ($name === 'valid') {
return $this->valid;
}
if (false === $key = $this->getKey($name)) {
$trace = debug_backtrace();
trigger_error(
'Undefined property ' . $name .
' in ' . $trace[0]['file'] .
' on line ' . $trace[0]['line'],
E_USER_NOTICE)
;
return null;
}
return isset($this->data[$key])?$this->data[$key]:'';
}
public function setUri($uri) {
$this->uri = $uri;
$this->data = array();
$sheme = parse_url($uri, PHP_URL_SCHEME);
# invalid URI scheme
if ($sheme !== 'magnet') return $this->valid = false;
$query = parse_url($uri, PHP_URL_QUERY);
if ($query === false) return $this->valid = false;
parse_str($query, $data);
if (null == $data) return $this->valid = false;
$this->data = $data;
return $this->valid = true;
}
public function isValid() {
return $this->valid;
}
public function getRawData() {
return $this->data;
}
public function __construct($uri) {
$this->init();
$this->setUri($uri);
}
public function __toString() {
ob_start();
printf("Magnet URI: %s (%s)\n\n", $this->uri, $this->valid?'valid':'invalid');
$l = max(array_map('strlen', $this->def['keys']));
foreach($this->def['keys'] as $key => $name) {
printf(" %'.-{$l}.{$l}s (%s): %s\n", $name.' ', $key, $this->$key);
}
return ob_get_clean();
}
}