229 lines
6.3 KiB
PHP
Executable File
229 lines
6.3 KiB
PHP
Executable File
<?php
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/*
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* @link http://www.kalcaddle.com/
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* @author warlee | e-mail:kalcaddle@qq.com
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* @copyright warlee 2014.(Shanghai)Co.,Ltd
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* @license http://kalcaddle.com/tools/licenses/license.txt
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*/
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class downloader {
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static function start($url, $save_file,$headers = array(),$timeout = 10) {
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$data_file = $save_file . '.download.cfg';
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$save_temp = $save_file . '.downloading';
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//if not support range
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$file_header = url_header($url);
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$url = $file_header['url'];
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//show_json(get_headers("http://sabre.io/",true));
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if(!$file_header['support_range'] ||
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$file_header['length']<=0){
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unlink($save_temp);
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unlink($save_file);
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return self::file_download_this($url,$save_file,$file_header['length']);
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}
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// default header
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$url_info = self::parse_url($url);
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if (!$url_info) {
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return array('code'=>false,'data'=>'url_error');
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}
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$def_headers = array(
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'Accept' => '*/*',
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'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0)',
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'Host' => $url_info['host'],
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'Connection' => 'Close',
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'Accept-Language' => 'zh-cn',
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);
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$headers = array_merge($def_headers, $headers);
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$exists_length = is_file($save_temp) ? filesize($save_temp) : 0;
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$content_length = intval($file_header['length']);
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if( file_exists($save_temp) &&
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time() - filemtime($save_temp) < 3) {//has Changed in 3s,is downloading
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return array('code'=>false,'data'=>'downloading');
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}
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$exists_data = array();
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if(is_file($data_file)){
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$temp_data = file_get_contents($data_file);
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$exists_data = json_decode($temp_data, 1);
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}
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// check file is valid
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if ($exists_length == $content_length) {
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$exists_data && @unlink($data_file);
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self::move_file($save_temp,$save_file,$data_file);
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return array('code'=>true,'data'=>'temp_exist');
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}
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// exist and is the same file;
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if( file_exists($save_file) && $content_length == filesize($save_file)){
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@unlink($save_temp);
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@unlink($data_file);
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return array('code'=>true,'data'=>'exist');
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}
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// check file is expire
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if ($exists_data['length'] != $content_length) {
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$exists_data = array('length' => $content_length);
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}
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if($exists_length > $content_length){
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@unlink($save_temp);
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}
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// write exists data
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file_put_contents($data_file, json_encode($exists_data));
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$download_status = self::download_content(
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$url_info['host'],
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$url_info['port'],
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$url_info['request'],
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$save_temp,
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$content_length,
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$exists_length,
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$headers,
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$timeout
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);
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if ($download_status['code']) {
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self::move_file($save_temp,$save_file,$data_file);
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}
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return $download_status;
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}
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// fopen then download
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static function file_download_this($from, $file_name,$header_size=0){
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@set_time_limit(0);
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$file_temp = $file_name.'.downloading';
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if ($fp = @fopen ($from, "rb")){
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if(!$download_fp = @fopen($file_temp, "wb")){
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return array('code'=>false,'data'=>'open_downloading_error');
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}
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while(!feof($fp)){
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if(!file_exists($file_temp)){//删除目标文件；则终止下载
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fclose($download_fp);
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return array('code'=>false,'data'=>'stoped');
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}
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//对于部分fp不结束的通过文件大小判断
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clearstatcache();
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if( $header_size>0 &&
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$header_size==get_filesize(iconv_system($file_temp))
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){
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break;
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}
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fwrite($download_fp, fread($fp, 1024 * 8 ), 1024 * 8);
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}
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//下载完成，重命名临时文件到目标文件
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fclose($download_fp);
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fclose($fp);
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if(!rename($file_temp,$file_name)){
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unlink($file_name);
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return rename($file_temp,$file_name);
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}
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return array('code'=>true,'data'=>'success');
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}else{
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return array('code'=>false,'data'=>'url_open_error');
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}
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}
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static function move_file($from,$to,$data_file){
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$res = @rename($from,$to);
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if(!$res){
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@unlink($to);
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@rename($from,$to);
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}
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@unlink($data_file);
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}
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/**
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* parse url
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*
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* @param $url
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* @return bool|mixed
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*/
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static function parse_url($url) {
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$url_info = parse_url($url);
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if (!$url_info['host']) {
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return false;
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}
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$url_info['port'] = $url_info['port'] ? $url_info['host'] : 80;
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$url_info['request'] = $url_info['path'] . ($url_info['query'] ? '?' . $url_info['query'] : '');
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return $url_info;
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}
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static function download_content($host, $port, $url_path, $save_file, $content_length, $range_start,&$headers, $timeout) {
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$request = self::build_header('GET', $url_path, $headers, $range_start);
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$fsocket = @fsockopen($host, $port, $errno, $errstr, $timeout);
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stream_set_blocking($fsocket, TRUE);
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stream_set_timeout($fsocket, $timeout);
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fwrite($fsocket, $request);
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$status = stream_get_meta_data($fsocket);
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if ($status['timed_out']) {
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return array('code'=>false,'data'=>'socket_connect_timeout');
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}
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$is_header_end = 0;
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$total_size = $range_start;
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$file_fp = fopen($save_file, 'a+');
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if (!$file_fp || !flock($file_fp, LOCK_EX)) {
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fclose($file_fp);
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return array('code'=>false,'data'=>'downloading');
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}
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while (!feof($fsocket)) {
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if(!file_exists($save_file)){
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flock($file_fp, LOCK_UN);
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fclose($fsocket);
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fclose($file_fp);
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return array('code'=>false,'data'=>'stoped');
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}
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if (!$is_header_end) {
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$line = @fgets($fsocket);
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if (in_array($line, array("\n", "\r\n"))) {
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$is_header_end = 1;
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}
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continue;
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}
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$resp = fread($fsocket, 10240);
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$read_length = strlen($resp);
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if ($resp === false || $content_length < $total_size + $read_length) {
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flock($file_fp, LOCK_UN);
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fclose($fsocket);
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fclose($file_fp);
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return array('code'=>false,'data'=>'socket_error');
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}
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$total_size += $read_length;
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fputs($file_fp, $resp);
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if ($content_length == $total_size) {
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break;
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}
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}
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flock($file_fp, LOCK_UN);
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fclose($fsocket);
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fclose($file_fp);
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return array('code'=>true,'data'=>'success');
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}
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/**
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* build header for socket
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*
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* @param $action
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* @param $url_path
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* @param $headers
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* @param int $range_start
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* @return string
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*/
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static function build_header($action, $url_path, &$headers, $range_start = -1) {
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$out = $action . " {$url_path} HTTP/1.0\r\n";
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foreach ($headers as $hkey => $hval) {
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$out .= $hkey . ': ' . $hval . "\r\n";
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}
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if ($range_start > -1) {
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$out .= "Accept-Ranges: bytes\r\n";
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$out .= "Range: bytes={$range_start}-\r\n";
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}
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$out .= "\r\n";
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return $out;
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}
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}
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