<?php
class Torrent {
const timeout = 30;
static protected $_errors = array();
public function __construct ( $data = null, $meta = array(), $piece_length = 256 ) {
if ( is_null( $data ) )
return false;
if ( $piece_length < 32 || $piece_length > 4096 )
return self::set_error( new Exception( 'Invalid piece lenth, must be between 32 and 4096' ) );
if ( is_string( $meta ) )
$meta = array( 'announce' => $meta );
if ( $this->build( $data, $piece_length * 1024 ) )
$this->touch();
else
$meta = array_merge( $meta, $this->decode( $data ) );
foreach( $meta as $key => $value )
$this->{$key} = $value;
}
public function __toString() {
return $this->encode( $this );
}
public function error() {
return empty( self::$_errors ) ?
false :
self::$_errors[0]->getMessage();
}
public function errors() {
return empty( self::$_errors ) ?
false :
self::$_errors;
}
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 );
}
public function comment ( $comment = null ) {
return is_null( $comment ) ?
isset( $this->comment ) ? $this->comment : null :
$this->touch( $this->comment = (string) $comment );
}
public function name ( $name = null ) {
return is_null( $name ) ?
isset( $this->info['name'] ) ? $this->info['name'] : null :
$this->touch( $this->info['name'] = (string) $name );
}
public function is_private ( $private = null ) {
return is_null( $private ) ?
! empty( $this->info['private'] ) :
$this->touch( $this->info['private'] = $private ? 1 : 0 );
}
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 );
}
public function httpseeds ( $urls = null ) {
return is_null( $urls ) ?
isset( $this->httpseeds ) ? $this->httpseeds : null :
$this->touch( $this->httpseeds = (array) $urls );
}
public function piece_length () {
return isset( $this->info['piece length'] ) ?
$this->info['piece length'] :
null;
}
public function hash_info () {
return isset( $this->info ) ?
sha1( self::encode( $this->info ) ) :
null;
}
public function content ( $precision = null ) {
$files = array();
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;
}
public function offset () {
$files = array();
$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'] )] = array(
'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']] = array(
'startpiece' => 0,
'offset' => 0,
'size' => $this->info['length'],
'endpiece' => floor( $this->info['length'] / $this->info['piece length'] )
);
return $files;
}
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 );
}
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 = array();
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( array( 'udp://', '/announce', ':80/' ), array( '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 ( ( $state = curl_multi_exec( $curl, $running ) ) == CURLM_CALL_MULTI_PERFORM );
if( $state != CURLM_OK )
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 ( $info['http_code'] != 200 ) {
$scrape[$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'] ) ? array() : $stats['flags'] );
}
} while ( $running );
curl_multi_close( $curl );
return $scrape;
}
public function save ( $filename = null ) {
return file_put_contents( is_null( $filename ) ? $this->info['name'] . '.torrent' : $filename, $this->encode( $this ) );
}
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="[files-sib.net]' . ( is_null( $filename ) ? $this->info['name'] . '.torrent' : $filename ) . '"' );
exit( $data );
}
public function magnet ( $html = true ) {
$ampersand = $html ? '&' : '&';
return sprintf( 'magnet:?xt=urn:btih:%2$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() ) ) );
}
static public function encode ( $mixed ) {
switch ( gettype( $mixed ) ) {
case 'integer':
case 'double':
return self::encode_integer( $mixed );
case 'object':
$mixed = get_object_vars( $mixed );
case 'array':
return self::encode_array( $mixed );
default:
return self::encode_string( (string) $mixed );
}
}
static private function encode_string ( $string ) {
return strlen( $string ) . ':' . $string;
}
static private function encode_integer ( $integer ) {
return 'i' . $integer . 'e';
}
static private 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';
}
static protected function decode ( $string ) {
$data = is_file( $string ) || self::url_exists( $string ) ?
self::file_get_contents( $string ) :
$string;
return (array) self::decode_data( $data );
}
static private 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 );
}
}
static private function decode_dictionary ( & $data ) {
$dictionary = array();
$previous = null;
while ( ( $char = self::char( $data ) ) != 'e' ) {
if ( $char === false )
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 )
return self::set_error( new Exception( 'Missorted dictionary key' ) );
$dictionary[$key] = self::decode_data( $data );
$previous = $key;
}
$data = substr( $data, 1 );
return $dictionary;
}
static private function decode_list ( & $data ) {
$list = array();
while ( ( $char = self::char( $data ) ) != 'e' ) {
if ( $char === false )
return self::set_error( new Exception( 'Unterminated list' ) );
$list[] = self::decode_data( $data );
}
$data = substr( $data, 1 );
return $list;
}
static private function decode_string ( & $data ) {
if ( self::char( $data ) === '0' && 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;
}
static private function decode_integer ( & $data ) {
$start = 0;
$end = strpos( $data, 'e');
if ( $end === 0 )
self::set_error( new Exception( 'Empty integer' ) );
if ( self::char( $data ) == '-' )
$start++;
if ( substr( $data, $start, 1 ) == '0' && $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;
}
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;
}
protected function touch ( $void = null ) {
$this->{'created by'} = 'Files-Sib.NET Tracker';
$this->{'creation date'} = time();
return $void;
}
static protected function set_error ( $exception, $message = false ) {
return ( array_unshift( self::$_errors, $exception ) && $message ) ? $exception->getMessage() : false;
}
static protected function announce_list( $announce, $merge = array() ) {
return array_map( create_function( '$a', 'return (array) $a;' ), array_merge( (array) $announce, (array) $merge ) );
}
static protected function first_announce( $announce ) {
while ( is_array( $announce ) )
$announce = reset( $announce );
return $announce;
}
static protected function pack ( & $data ) {
return pack('H*', sha1( $data ) ) . ( $data = null );
}
static protected function path ( $path, $folder ) {
array_unshift( $path, $folder );
return join( DIRECTORY_SEPARATOR, $path );
}
static protected function is_list ( $array ) {
foreach ( array_keys( $array ) as $key )
if ( ! is_int( $key ) )
return false;
return true;
}
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);
}
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 = explode( DIRECTORY_SEPARATOR, $file );
return array(
'length' => $size,
'name' => end( $path ),
'piece length' => $piece_length,
'pieces' => $this->pieces( $handle, $piece_length )
);
}
private function files ( $files, $piece_length ) {
if ( ! self::is_url( current( $files ) ) )
$files = array_map( 'realpath', $files );
sort( $files );
usort( $files, create_function( '$a,$b', 'return strrpos($a,DIRECTORY_SEPARATOR)-strrpos($b,DIRECTORY_SEPARATOR);' ) );
$first = current( $files );
$root = dirname( $first );
if ( $url = self::is_url( $first ) )
$this->url_list( dirname( $root ) . DIRECTORY_SEPARATOR );
$path = explode( DIRECTORY_SEPARATOR, dirname( $url ? $first : realpath( $first ) ) );
$pieces = null; $info_files = array(); $count = count( $files ) - 1;
foreach ( $files as $i => $file ) {
if ( $path != array_intersect_assoc( $file_path = explode( DIRECTORY_SEPARATOR, $file ), $path ) ) {
self::set_error( new Exception( 'Files must be in the same folder: "' . $file . '" discarded' ) );
continue;
}
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[] = array(
'length' => $filesize,
'path' => array_diff( $file_path, $path )
);
}
return array(
'files' => $info_files,
'name' => end( $path ),
'piece length' => $piece_length,
'pieces' => $pieces
);
}
private function folder ( $dir, $piece_length ) {
return $this->files( self::scandir( $dir ), $piece_length );
}
static private function char ( $data ) {
return empty( $data ) ?
false :
substr( $data, 0, 1 );
}
static public function format ( $size, $precision = 2 ) {
$units = array ('octets', 'Kb', 'Mb', 'Gb', 'Tb');
while( ( $next = next( $units ) ) && $size > 1024 )
$size /= 1024;
return round( $size, $precision ) . ' ' . ( $next ? prev( $units ) : end( $units ) );
}
static public function filesize ( $file ) {
if ( is_file( $file ) )
return (double) sprintf( '%u', @filesize( $file ) );
else if ( $content_length = preg_grep( $pattern = '#^Content-Length:\s+(\d+)$#i', (array) @get_headers( $file ) ) )
return (int) preg_replace( $pattern, '$1', reset( $content_length ) );
}
static public 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' );
}
static public function scandir ( $dir ) {
$paths = array();
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;
}
static public function is_url ( $url ) {
return preg_match( '#^http(s)?://[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(/.*)?$#i', $url );
}
static public function url_exists ( $url ) {
return self::is_url( $url ) ?
(bool) self::filesize ( $url ) :
false;
}
static public function is_torrent ( $file, $timeout = self::timeout ) {
return ( $start = self::file_get_contents( $file, $timeout, 0, 11 ) ) && $start === 'd8:announce' || $start === 'd10:created';
}
static public 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( array( 'http' => array( '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;
}
static public function untier( $announces ) {
$list = array();
foreach ( (array) $announces as $tier ) {
is_array( $tier ) ?
$list = array_merge( $list, self::untier( $tier ) ) :
array_push( $list, $tier );
}
return $list;
}
public function upload($torrent){
}
}