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@adriengibrat @DRSDavidSoft @darkalchemy @Rudde @dimak08 @aberaud
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<?php
/**
* Torrent.
*
* PHP version 5.2+ (with cURL extention enabled)
*
* 1) Features:
* - Decode torrent file or data from local file and distant url
* - Build torrent from source folder/file(s) or distant url
* - Super easy usage & syntax
* - Silent Exception error system
*
* 2) Usage example
* <code>
* require_once 'Torrent.php';
*
* // get torrent infos
* $torrent = new Torrent( './test.torrent' );
* echo '<br>private: ', $torrent->is_private() ? 'yes' : 'no',
* '<br>announce: ', $torrent->announce(),
* '<br>name: ', $torrent->name(),
* '<br>comment: ', $torrent->comment(),
* '<br>piece_length: ', $torrent->piece_length(),
* '<br>size: ', $torrent->size( 2 ),
* '<br>hash info: ', $torrent->hash_info(),
* '<br>stats: ';
* var_dump( $torrent->scrape() );
* echo '<br>content: ';
* var_dump( $torrent->content() );
* echo '<br>source: ',
* $torrent;
*
* // get magnet link
* $torrent->magnet(); // use $torrent->magnet( false ); to get non html encoded ampersand
*
* // create torrent
* $torrent = new Torrent( array( 'test.mp3', 'test.jpg' ), 'http://torrent.tracker/annonce' );
* $torrent->save('test.torrent'); // save to disk
*
* // modify torrent
* $torrent->announce('http://alternate-torrent.tracker/annonce'); // add a tracker
* $torrent->announce(false); // reset announce trackers
* $torrent->announce(array('http://torrent.tracker/annonce', 'http://alternate-torrent.tracker/annonce')); // set tracker(s), it also works with a 'one tracker' array...
* $torrent->announce(array(array('http://torrent.tracker/annonce', 'http://alternate-torrent.tracker/annonce'), 'http://another-torrent.tracker/annonce')); // set tiered trackers
* $torrent->comment('hello world');
* $torrent->name('test torrent');
* $torrent->is_private(true);
* $torrent->httpseeds('http://file-hosting.domain/path/'); // BitTornado implementation
* $torrent->url_list(array('http://file-hosting.domain/path/','http://another-file-hosting.domain/path/')); //
* GetRight implementation
*
* // print errors
* if ( $errors = $torrent->errors() )
* var_dump( $errors );
*
* // send to user
* $torrent->send();
* </code>
*
* @author Adrien Gibrat <adrien.gibrat@gmail.com>
* @tester Jeong, Anton, dokcharlie, official testers ;) Thanks for your precious feedback
* @copyleft 2010 - Just use it!
*
* @license http://www.gnu.org/licenses/gpl.html GNU General Public License version 3
*
* @version 0.0.3
*/
class Torrent
{
/**
* @const float Default http timeout
*/
const timeout = 30;
/**
* @var array List of error occurred
*/
protected static $_errors = [];
/** Read and decode torrent file/data OR build a torrent from source folder/file(s)
* Supported signatures:
* - Torrent(); // get an instance (useful to scrape and check errors)
* - Torrent( string $torrent ); // analyze a torrent file
* - Torrent( string $torrent, string $announce );
* - Torrent( string $torrent, array $meta );
* - Torrent( string $file_or_folder ); // create a torrent file
* - Torrent( string $file_or_folder, string $announce_url, [int $piece_length] );
* - Torrent( string $file_or_folder, array $meta, [int $piece_length] );
* - Torrent( array $files_list );
* - Torrent( array $files_list, string $announce_url, [int $piece_length] );
* - Torrent( array $files_list, array $meta, [int $piece_length] );.
*
* @param string|array torrent to read or source folder/file(s) (optional, to get an instance)
* @param string|array announce url or meta informations (optional)
* @param int piece length (optional)
*/
public function __construct($data = null, $meta = [], $piece_length = 256)
{
if (is_null($data)) {
return false;
}
if ($piece_length < 32 || $piece_length > 4096) {
return self::set_error(new Exception('Invalid piece length, must be between 32 and 4096'));
}
if (is_string($meta)) {
$meta = ['announce' => $meta];
}
if ($this->build($data, $piece_length * 1024)) {
$this->touch();
} else {
$meta = array_merge($meta, $this->decode($data));
}
foreach ($meta as $key => $value) {
$this->{trim($key)} = $value;
}
}
/** Convert the current Torrent instance in torrent format
*
* @return string encoded torrent data
*/
public function __toString()
{
return $this->encode($this);
}
/** Return last error message
*
* @return string|bool last error message or false if none
*/
public function error()
{
return empty(self::$_errors) ?
false :
self::$_errors[0]->getMessage();
}
/** Return Errors
*
* @return array|bool error list or false if none
*/
public function errors()
{
return empty(self::$_errors) ?
false :
self::$_errors;
}
/**** Getters and setters ****/
/** Getter and setter of torrent announce url / list
* If the argument is a string, announce url is added to announce list (or set as announce if announce is not set)
* If the argument is an array/object, set announce url (with first url) and list (if array has more than one url), tiered list supported
* If the argument is false announce url & list are unset.
*
* @param null|false|string|array announce url / list, reset all if false (optional, if omitted it's a getter)
*
* @return string|array|null announce url / list or null if not set
*/
public function announce($announce = null)
{
if (is_null($announce)) {
return !isset($this->{'announce-list'}) ?
isset($this->announce) ? $this->announce : null :
$this->{'announce-list'};
}
$this->touch();
if (is_string($announce) && isset($this->announce)) {
return $this->{'announce-list'} = self::announce_list(isset($this->{'announce-list'}) ? $this->{'announce-list'} : $this->announce, $announce);
}
unset($this->{'announce-list'});
if (is_array($announce) || is_object($announce)) {
if (($this->announce = self::first_announce($announce)) && count($announce) > 1) {
return $this->{'announce-list'} = self::announce_list($announce);
} else {
return $this->announce;
}
}
if (!isset($this->announce) && $announce) {
return $this->announce = (string) $announce;
}
unset($this->announce);
}
/** Getter and setter of torrent creation date
*
* @param null|int timestamp (optional, if omitted it's a getter)
*
* @return int|null timestamp or null if not set
*/
public function creation_date($timestamp = null)
{
return is_null($timestamp) ?
isset($this->{'creation date'}) ? $this->{'creation date'} : null :
$this->touch($this->{'creation date'} = (int) $timestamp);
}
/** Getter and setter of torrent comment
*
* @param null|string comment (optional, if omitted it's a getter)
*
* @return string|null comment or null if not set
*/
public function comment($comment = null)
{
return is_null($comment) ?
isset($this->comment) ? $this->comment : null :
$this->touch($this->comment = (string) $comment);
}
/** Getter and setter of torrent name
*
* @param null|string name (optional, if omitted it's a getter)
*
* @return string|null name or null if not set
*/
public function name($name = null)
{
return is_null($name) ?
isset($this->info['name']) ? $this->info['name'] : null :
$this->touch($this->info['name'] = (string) $name);
}
/** Getter and setter of private flag
*
* @param null|bool is private or not (optional, if omitted it's a getter)
*
* @return bool private flag
*/
public function is_private($private = null)
{
return is_null($private) ?
!empty($this->info['private']) :
$this->touch($this->info['private'] = $private ? 1 : 0);
}
/** Getter and setter of torrent source
*
* @param null|string source (optional, if omitted it's a getter)
*
* @return string|null source or null if not set
*/
public function source($source = null)
{
return is_null($source) ?
isset($this->info['source']) ? $this->info['source'] : null :
$this->touch($this->info['source'] = (string) $source);
}
/** Getter and setter of webseed(s) url list ( GetRight implementation )
*
* @param null|string|array webseed or webseeds mirror list (optional, if omitted it's a getter)
*
* @return string|array|null webseed(s) or null if not set
*/
public function url_list($urls = null)
{
return is_null($urls) ?
isset($this->{'url-list'}) ? $this->{'url-list'} : null :
$this->touch($this->{'url-list'} = is_string($urls) ? $urls : (array) $urls);
}
/** Getter and setter of httpseed(s) url list ( BitTornado implementation )
*
* @param null|string|array httpseed or httpseeds mirror list (optional, if omitted it's a getter)
*
* @return array|null httpseed(s) or null if not set
*/
public function httpseeds($urls = null)
{
return is_null($urls) ?
isset($this->httpseeds) ? $this->httpseeds : null :
$this->touch($this->httpseeds = (array) $urls);
}
/**** Analyze BitTorrent ****/
/** Get piece length
*
* @return int piece length or null if not set
*/
public function piece_length()
{
return isset($this->info['piece length']) ?
$this->info['piece length'] :
null;
}
/** Compute hash info
*
* @return string hash info or null if info not set
*/
public function hash_info()
{
return isset($this->info) ?
sha1(self::encode($this->info)) :
null;
}
/** List torrent content
*
* @param int|null size precision (optional, if omitted returns sizes in bytes)
*
* @return array file(s) and size(s) list, files as keys and sizes as values
*/
public function content($precision = null)
{
$files = [];
if (isset($this->info['files']) && is_array($this->info['files'])) {
foreach ($this->info['files'] as $file) {
$files[self::path($file['path'], $this->info['name'])] = $precision ?
self::format($file['length'], $precision) :
$file['length'];
}
} elseif (isset($this->info['name'])) {
$files[$this->info['name']] = $precision ?
self::format($this->info['length'], $precision) :
$this->info['length'];
}
return $files;
}
/** List torrent content pieces and offset(s)
*
* @return array file(s) and pieces/offset(s) list, file(s) as keys and pieces/offset(s) as values
*/
public function offset()
{
$files = [];
$size = 0;
if (isset($this->info['files']) && is_array($this->info['files'])) {
foreach ($this->info['files'] as $file) {
$files[self::path($file['path'], $this->info['name'])] = [
'startpiece' => floor($size / $this->info['piece length']),
'offset' => fmod($size, $this->info['piece length']),
'size' => $size += $file['length'],
'endpiece' => floor($size / $this->info['piece length']),
];
}
} elseif (isset($this->info['name'])) {
$files[$this->info['name']] = [
'startpiece' => 0,
'offset' => 0,
'size' => $this->info['length'],
'endpiece' => floor($this->info['length'] / $this->info['piece length']),
];
}
return $files;
}
/** Sum torrent content size
*
* @param int|null size precision (optional, if omitted returns size in bytes)
*
* @return int|string file(s) size
*/
public function size($precision = null)
{
$size = 0;
if (isset($this->info['files']) && is_array($this->info['files'])) {
foreach ($this->info['files'] as $file) {
$size += $file['length'];
}
} elseif (isset($this->info['name'])) {
$size = $this->info['length'];
}
return is_null($precision) ?
$size :
self::format($size, $precision);
}
/** Request torrent statistics from scrape page USING CURL!!
*
* @param string|array announce or scrape page url (optional, to request an alternative tracker BUT required for static call)
* @param string torrent hash info (optional, required ONLY for static call)
* @param float read timeout in seconds (optional, default to self::timeout 30s)
*
* @return array tracker torrent statistics
*/
/* static */
public function scrape($announce = null, $hash_info = null, $timeout = self::timeout)
{
$packed_hash = urlencode(pack('H*', $hash_info ? $hash_info : $this->hash_info()));
$handles = $scrape = [];
if (!function_exists('curl_multi_init')) {
return self::set_error(new Exception('Install CURL with "curl_multi_init" enabled'));
}
$curl = curl_multi_init();
foreach ((array) ($announce ? $announce : $this->announce()) as $tier) {
foreach ((array) $tier as $tracker) {
$tracker = str_ireplace([
'udp://',
'/announce',
':80/',
], [
'http://',
'/scrape',
'/',
], $tracker);
if (isset($handles[$tracker])) {
continue;
}
$handles[$tracker] = curl_init($tracker . '?info_hash=' . $packed_hash);
curl_setopt($handles[$tracker], CURLOPT_RETURNTRANSFER, true);
curl_setopt($handles[$tracker], CURLOPT_TIMEOUT, $timeout);
curl_multi_add_handle($curl, $handles[$tracker]);
}
}
do {
while (CURLM_CALL_MULTI_PERFORM == ($state = curl_multi_exec($curl, $running)));
if (CURLM_OK != $state) {
continue;
}
while ($done = curl_multi_info_read($curl)) {
$info = curl_getinfo($done['handle']);
$tracker = explode('?', $info['url'], 2);
$tracker = array_shift($tracker);
if (empty($info['http_code'])) {
$scrape[$tracker] = self::set_error(new Exception('Tracker request timeout (' . $timeout . 's)'), true);
continue;
} elseif (200 != $info['http_code']) {
$scrape[$tracker] = self::set_error(new Exception('Tracker request failed (' . $info['http_code'] . ' code)'), true);
continue;
}
$data = curl_multi_getcontent($done['handle']);
$stats = self::decode_data($data);
curl_multi_remove_handle($curl, $done['handle']);
$scrape[$tracker] = empty($stats['files']) ?
self::set_error(new Exception('Empty scrape data'), true) :
array_shift($stats['files']) + (empty($stats['flags']) ? [] : $stats['flags']);
}
} while ($running);
curl_multi_close($curl);
return $scrape;
}
/**** Save and Send ****/
/** Save torrent file to disk
*
* @param null|string name of the file (optional)
*
* @return bool file has been saved or not
*/
public function save($filename = null)
{
return file_put_contents(is_null($filename) ? $this->info['name'] . '.torrent' : $filename, $this->encode($this));
}
/** Send torrent file to client
*
* @param null|string name of the file (optional)
*/
public function send($filename = null)
{
$data = $this->encode($this);
header('Content-type: application/x-bittorrent');
header('Content-Length: ' . strlen($data));
header('Content-Disposition: attachment; filename="' . (is_null($filename) ? $this->info['name'] . '.torrent' : $filename) . '"');
exit($data);
}
/** Get magnet link
*
* @param bool html encode ampersand, default true (optional)
*
* @return string magnet link
*/
public function magnet($html = true)
{
$ampersand = $html ? '&amp;' : '&';
return sprintf('magnet:?xt=urn:btih:%2$s%1$sdn=%3$s%1$sxl=%4$d%1$str=%5$s', $ampersand, $this->hash_info(), urlencode($this->name()), $this->size(), implode($ampersand . 'tr=', self::untier($this->announce())));
}
/**** Encode BitTorrent ****/
/** Encode torrent data
*
* @param mixed data to encode
*
* @return string torrent encoded data
*/
public static function encode($mixed)
{
switch (gettype($mixed)) {
case 'integer':
case 'double':
return self::encode_integer($mixed);
case 'object':
$mixed = get_object_vars($mixed);
// no break
case 'array':
return self::encode_array($mixed);
default:
return self::encode_string((string) $mixed);
}
}
/** Encode torrent string
*
* @param string string to encode
*
* @return string encoded string
*/
private static function encode_string($string)
{
return strlen($string) . ':' . $string;
}
/** Encode torrent integer
*
* @param int integer to encode
*
* @return string encoded integer
*/
private static function encode_integer($integer)
{
return 'i' . $integer . 'e';
}
/** Encode torrent dictionary or list
*
* @param array array to encode
*
* @return string encoded dictionary or list
*/
private static function encode_array($array)
{
if (self::is_list($array)) {
$return = 'l';
foreach ($array as $value) {
$return .= self::encode($value);
}
} else {
ksort($array, SORT_STRING);
$return = 'd';
foreach ($array as $key => $value) {
$return .= self::encode(strval($key)) . self::encode($value);
}
}
return $return . 'e';
}
/**** Decode BitTorrent ****/
/** Decode torrent data or file
*
* @param string data or file path to decode
*
* @return array decoded torrent data
*/
protected static function decode($string)
{
$data = is_file($string) || self::url_exists($string) ?
self::file_get_contents($string) :
$string;
return (array) self::decode_data($data);
}
/** Decode torrent data
*
* @param string data to decode
*
* @return array decoded torrent data
*/
private static function decode_data(&$data)
{
switch (self::char($data)) {
case 'i':
$data = substr($data, 1);
return self::decode_integer($data);
case 'l':
$data = substr($data, 1);
return self::decode_list($data);
case 'd':
$data = substr($data, 1);
return self::decode_dictionary($data);
default:
return self::decode_string($data);
}
}
/** Decode torrent dictionary
*
* @param string data to decode
*
* @return array decoded dictionary
*/
private static function decode_dictionary(&$data)
{
$dictionary = [];
$previous = null;
while ('e' != ($char = self::char($data))) {
if (false === $char) {
return self::set_error(new Exception('Unterminated dictionary'));
}
if (!ctype_digit($char)) {
return self::set_error(new Exception('Invalid dictionary key'));
}
$key = self::decode_string($data);
if (isset($dictionary[$key])) {
return self::set_error(new Exception('Duplicate dictionary key'));
}
if ($key < $previous) {
self::set_error(new Exception('Missorted dictionary key'));
}
$dictionary[$key] = self::decode_data($data);
$previous = $key;
}
$data = substr($data, 1);
return $dictionary;
}
/** Decode torrent list
*
* @param string data to decode
*
* @return array decoded list
*/
private static function decode_list(&$data)
{
$list = [];
while ('e' != ($char = self::char($data))) {
if (false === $char) {
return self::set_error(new Exception('Unterminated list'));
}
$list[] = self::decode_data($data);
}
$data = substr($data, 1);
return $list;
}
/** Decode torrent string
*
* @param string data to decode
*
* @return string decoded string
*/
private static function decode_string(&$data)
{
if ('0' === self::char($data) && ':' != substr($data, 1, 1)) {
self::set_error(new Exception('Invalid string length, leading zero'));
}
if (!$colon = @strpos($data, ':')) {
return self::set_error(new Exception('Invalid string length, colon not found'));
}
$length = intval(substr($data, 0, $colon));
if ($length + $colon + 1 > strlen($data)) {
return self::set_error(new Exception('Invalid string, input too short for string length'));
}
$string = substr($data, $colon + 1, $length);
$data = substr($data, $colon + $length + 1);
return $string;
}
/** Decode torrent integer
*
* @param string data to decode
*
* @return int decoded integer
*/
private static function decode_integer(&$data)
{
$start = 0;
$end = strpos($data, 'e');
if (0 === $end) {
self::set_error(new Exception('Empty integer'));
}
if ('-' == self::char($data)) {
++$start;
}
if ('0' == substr($data, $start, 1) && $end > $start + 1) {
self::set_error(new Exception('Leading zero in integer'));
}
if (!ctype_digit(substr($data, $start, $start ? $end - 1 : $end))) {
self::set_error(new Exception('Non-digit characters in integer'));
}
$integer = substr($data, 0, $end);
$data = substr($data, $end + 1);
return 0 + $integer;
}
/**** Internal Helpers ****/
/** Build torrent info
*
* @param string|array source folder/file(s) path
* @param int piece length
*
* @return array|bool torrent info or false if data isn't folder/file(s)
*/
protected function build($data, $piece_length)
{
if (is_null($data)) {
return false;
} elseif (is_array($data) && self::is_list($data)) {
return $this->info = $this->files($data, $piece_length);
} elseif (is_dir($data)) {
return $this->info = $this->folder($data, $piece_length);
} elseif ((is_file($data) || self::url_exists($data)) && !self::is_torrent($data)) {
return $this->info = $this->file($data, $piece_length);
} else {
return false;
}
}
/** Set torrent creator and creation date
*
* @param any param
*
* @return any param
*/
protected function touch($void = null)
{
$this->{'created by'} = 'Torrent RW PHP Class - http://github.com/adriengibrat/torrent-rw';
$this->{'creation date'} = time();
return $void;
}
/** Add an error to errors stack
*
* @param Exception error to add
* @param bool return error message or not (optional, default to false)
*
* @return bool|string return false or error message if requested
*/
protected static function set_error($exception, $message = false)
{
return (array_unshift(self::$_errors, $exception) && $message) ? $exception->getMessage() : false;
}
/** Build announce list
*
* @param string|array announce url / list
* @param string|array announce url / list to add (optionnal)
*
* @return array announce list (array of arrays)
*/
protected static function announce_list($announce, $merge = [])
{
return array_map(function($a) {return (array) $a;}, array_merge((array) $announce, (array) $merge));
}
/** Get the first announce url in a list
*
* @param array announce list (array of arrays if tiered trackers)
*
* @return string first announce url
*/
protected static function first_announce($announce)
{
while (is_array($announce)) {
$announce = reset($announce);
}
return $announce;
}
/** Helper to pack data hash
*
* @param string data
*
* @return string packed data hash
*/
protected static function pack(&$data)
{
return pack('H*', sha1($data)) . ($data = null);
}
/** Helper to build file path
*
* @param array file path
* @param string base folder
*
* @return string real file path
*/
protected static function path($path, $folder)
{
array_unshift($path, $folder);
return join(DIRECTORY_SEPARATOR, $path);
}
/** Helper to explode file path
*
* @param string file path
*
* @return array file path
*/
protected static function path_explode($path)
{
return explode(DIRECTORY_SEPARATOR, $path);
}
/** Helper to test if an array is a list
*
* @param array array to test
*
* @return bool is the array a list or not
*/
protected static function is_list($array)
{
foreach (array_keys($array) as $key) {
if (!is_int($key)) {
return false;
}
}
return true;
}
/** Build pieces depending on piece length from a file handler
*
* @param ressource file handle
* @param int piece length
* @param bool is last piece
*
* @return string pieces
*/
private function pieces($handle, $piece_length, $last = true)
{
static $piece, $length;
if (empty($length)) {
$length = $piece_length;
}
$pieces = null;
while (!feof($handle)) {
if (($length = strlen($piece .= fread($handle, $length))) == $piece_length) {
$pieces .= self::pack($piece);
} elseif (($length = $piece_length - $length) < 0) {
return self::set_error(new Exception('Invalid piece length!'));
}
}
fclose($handle);
return $pieces . ($last && $piece ? self::pack($piece) : null);
}
/** Build torrent info from single file
*
* @param string file path
* @param int piece length
*
* @return array torrent info
*/
private function file($file, $piece_length)
{
if (!$handle = self::fopen($file, $size = self::filesize($file))) {
return self::set_error(new Exception('Failed to open file: "' . $file . '"'));
}
if (self::is_url($file)) {
$this->url_list($file);
}
$path = self::path_explode($file);
return [
'length' => $size,
'name' => end($path),
'piece length' => $piece_length,
'pieces' => $this->pieces($handle, $piece_length),
];
}
/** Build torrent info from files
*
* @param array file list
* @param int piece length
*
* @return array torrent info
*/
private function files($files, $piece_length)
{
sort($files);
usort($files, function($a, $b) {
return strrpos($a,DIRECTORY_SEPARATOR)-strrpos($b,DIRECTORY_SEPARATOR);
});
$first = current($files);
if (!self::is_url($first)) {
$files = array_map('realpath', $files);
} else {
$this->url_list(dirname($first) . DIRECTORY_SEPARATOR);
}
$files_path = array_map('self::path_explode', $files);
$root = call_user_func_array('array_intersect_assoc', $files_path);
$pieces = null;
$info_files = [];
$count = count($files) - 1;
foreach ($files as $i => $file) {
if (!$handle = self::fopen($file, $filesize = self::filesize($file))) {
self::set_error(new Exception('Failed to open file: "' . $file . '" discarded'));
continue;
}
$pieces .= $this->pieces($handle, $piece_length, $count == $i);
$info_files[] = [
'length' => $filesize,
'path' => array_diff_assoc($files_path[$i], $root),
];
}
return [
'files' => $info_files,
'name' => end($root),
'piece length' => $piece_length,
'pieces' => $pieces,
];
}
/** Build torrent info from folder content
*
* @param string folder path
* @param int piece length
*
* @return array torrent info
*/
private function folder($dir, $piece_length)
{
return $this->files(self::scandir($dir), $piece_length);
}
/** Helper to return the first char of encoded data
*
* @param string encoded data
*
* @return string|bool first char of encoded data or false if empty data
*/
private static function char($data)
{
return empty($data) ?
false :
substr($data, 0, 1);
}
/**** Public Helpers ****/
/** Helper to format size in bytes to human readable
*
* @param int size in bytes
* @param int precision after coma
*
* @return string formated size in appropriate unit
*/
public static function format($size, $precision = 2)
{
$units = [
'octets',
'Ko',
'Mo',
'Go',
'To',
];
while (($next = next($units)) && $size > 1024) {
$size /= 1024;
}
return round($size, $precision) . ' ' . ($next ? prev($units) : end($units));
}
/** Helper to return filesize (even bigger than 2Gb -linux only- and distant files size)
*
* @param string file path
*
* @return float|bool filesize or false if error
*/
public static function filesize($file)
{
if (is_file($file)) {
return (float) sprintf('%u', @filesize($file));
} elseif ($content_length = preg_grep($pattern = '#^Content-Length:\s+(\d+)$#i', (array) @get_headers($file))) {
return (int) preg_replace($pattern, '$1', reset($content_length));
}
}
/** Helper to open file to read (even bigger than 2Gb, linux only)
*
* @param string file path
* @param int|float file size (optional)
*
* @return resource|bool file handle or false if error
*/
public static function fopen($file, $size = null)
{
if ((is_null($size) ? self::filesize($file) : $size) <= 2 * pow(1024, 3)) {
return fopen($file, 'r');
} elseif (PHP_OS != 'Linux') {
return self::set_error(new Exception('File size is greater than 2GB. This is only supported under Linux'));
} elseif (!is_readable($file)) {
return false;
} else {
return popen('cat ' . escapeshellarg(realpath($file)), 'r');
}
}
/** Helper to scan directories files and sub directories recursively
*
* @param string directory path
*
* @return array directory content list
*/
public static function scandir($dir)
{
$paths = [];
foreach (scandir($dir) as $item) {
if ('.' != $item && '..' != $item) {
if (is_dir($path = realpath($dir . DIRECTORY_SEPARATOR . $item))) {
$paths = array_merge(self::scandir($path), $paths);
} else {
$paths[] = $path;
}
}
}
return $paths;
}
/** Helper to check if string is an url (http)
*
* @param string url to check
*
* @return bool is string an url
*/
public static function is_url($url)
{
return preg_match('#^http(s)?://[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(/.*)?$#i', $url);
}
/** Helper to check if url exists
*
* @param string url to check
*
* @return bool does the url exist or not
*/
public static function url_exists($url)
{
return self::is_url($url) ?
(bool) self::filesize($url) :
false;
}
/** Helper to check if a file is a torrent
*
* @param string file location
* @param float http timeout (optional, default to self::timeout 30s)
*
* @return bool is the file a torrent or not
*/
public static function is_torrent($file, $timeout = self::timeout)
{
return ($start = self::file_get_contents($file, $timeout, 0, 11))
&& 'd8:announce' === $start
|| 'd10:created' === $start
|| 'd13:creatio' === $start
|| 'd13:announc' === $start
|| 'd12:_info_l' === $start
|| 'd7:comment' === substr($start, 0, 10) // @see https://github.com/adriengibrat/torrent-rw/issues/32
|| 'd4:info' === substr($start, 0, 7)
|| 'd9:' === substr($start, 0, 3); // @see https://github.com/adriengibrat/torrent-rw/pull/17
}
/** Helper to get (distant) file content
*
* @param string file location
* @param float http timeout (optional, default to self::timeout 30s)
* @param int starting offset (optional, default to null)
* @param int content length (optional, default to null)
*
* @return string|bool file content or false if error
*/
public static function file_get_contents($file, $timeout = self::timeout, $offset = null, $length = null)
{
if (is_file($file) || ini_get('allow_url_fopen')) {
$context = !is_file($file) && $timeout ?
stream_context_create(['http' => ['timeout' => $timeout]]) :
null;
return !is_null($offset) ? $length ?
@file_get_contents($file, false, $context, $offset, $length) :
@file_get_contents($file, false, $context, $offset) :
@file_get_contents($file, false, $context);
} elseif (!function_exists('curl_init')) {
return self::set_error(new Exception('Install CURL or enable "allow_url_fopen"'));
}
$handle = curl_init($file);
if ($timeout) {
curl_setopt($handle, CURLOPT_TIMEOUT, $timeout);
}
if ($offset || $length) {
curl_setopt($handle, CURLOPT_RANGE, $offset . '-' . ($length ? $offset + $length - 1 : null));
}
curl_setopt($handle, CURLOPT_RETURNTRANSFER, 1);
$content = curl_exec($handle);
$size = curl_getinfo($handle, CURLINFO_CONTENT_LENGTH_DOWNLOAD);
curl_close($handle);
return ($offset && $size == -1) || ($length && $length != $size) ? $length ?
substr($content, $offset, $length) :
substr($content, $offset) :
$content;
}
/** Flatten announces list
*
* @param array announces list
*
* @return array flattened announces list
*/
public static function untier($announces)
{
$list = [];
foreach ((array) $announces as $tier) {
is_array($tier) ?
$list = array_merge($list, self::untier($tier)) :
array_push($list, $tier);
}
return $list;
}
}
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