<?php 
ini_set('user_agent', 'GeMCAPI/4.1.0 (GeMC API Sync 1.1.0;Release)');
$active=array('mojang/launchermeta/mc/game/version_manifest.json','forge/last');
$type=array('.com');
//[0]:mojang
function url_exists($url){
    $ch = curl_init(); 
    curl_setopt ($ch, CURLOPT_URL, $url); 
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 3); 
    curl_setopt($ch, CURLOPT_TIMEOUT, 3);
    curl_exec($ch);
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);  
    if($http_code == 200){
        return true;
    }
    return false;
}
function url_exists_2($url){
	$opts = array(
		'http'=>array(
		'timeout'=>3,
		)
	);
	$context = stream_context_create($opts);
	return @file_get_contents($url, false, $context);
}
function get_main_domain($file){
	$str=preg_replace('/^[^\/]*\//is','',$file);
	$str2=str_replace('/'.$str,'',$file);
	return $str2;
}
function get_sub_domain($file){
	$str=preg_replace('/^[^\/]*\//is','',$file);
	$str2=preg_replace('/^[^\/]*\//is','',$str);
	$str3=str_replace('/'.$str2,'',$str);
	return $str3;
}
function get_file_path($file){
	$str=preg_replace('/^[^\/]*\//is','',$file);
	$str2=preg_replace('/^[^\/]*\//is','',$str);
	return $str2;
}
function get_online_url($file,$id){
	global $type;
	$str='http://'.get_sub_domain($file).'.'.get_main_domain($file).$type[$id].'/'.get_file_path($file);
	return $str;
}
function check_file_update($file,$dir,$url){
	$time=time()-@filemtime($file);
	if($time<86400){//检查文件是否超出过期期限（1天，86400秒）
		echo file_get_contents($file);
	}else{
		if(url_exists($url.'/'.str_replace($dir,'',$file))){//防止源无法访问而损坏文件
			if(file_get_contents($url.'/'.str_replace($dir,'',$file))==@file_get_contents($file)){
				echo file_get_contents($file);
			}else{
				echo file_get_contents($url.'/'.str_replace($dir,'',$file));
				$jsonwrite = fopen($file, "w") or die('{"wikis":"https://gitee.com/ghink/gemcapi/wikis","code":502,"server_time":"'.date("Y-m-d h:i:s").'"}');
				fwrite($jsonwrite,file_get_contents($url.'/'.str_replace($dir,'',$file)));
				fclose($jsonwrite);
			}
		}else{
			echo file_get_contents($file);
		}
	}
}
function check_file_update_adv($file,$url,$check_url){
	$time=time()-@filemtime($file);
	if($time<86400){//检查文件是否超出过期期限（1天，86400秒）
		echo file_get_contents($file);
	}else{
		if(url_exists_2($check_url)){//防止源无法访问而损坏文件
			if(file_get_contents($url)==@file_get_contents($file)){
				echo file_get_contents($file);
			}else{
				echo @file_get_contents($url);
				$jsonwrite = fopen($file, "w") or die('{"wikis":"https://gitee.com/ghink/gemcapi/wikis","code":502,"server_time":"'.date("Y-m-d h:i:s").'"}');
				fwrite($jsonwrite,file_get_contents($url));
				fclose($jsonwrite);
			}
		}else{
			echo file_get_contents($file);
		}
	}
}

function download_file($url,$file,$other){//下载文件
    system('python download.py --url "'.$url.'" --file "'.$file.'" --other "'.$other.'"');
}
if($_GET['error']!=""){
	echo '{"wikis":"https://gitee.com/ghink/gemcapi/wikis","code":'.$_GET['error'].',"server_time":"'.date("Y-m-d h:i:s").'"}';
}elseif($_GET['path']==""){
	echo '{"wikis":"https://gitee.com/ghink/gemcapi/wikis","code":200,"server_time":"'.date("Y-m-d h:i:s").'"}';
}else{
	if(is_file($_GET['path'])){
		//文件存在
		if(in_array($_GET['path'],$active)){//判断是否为需要保持最新的文件
			if(strstr($_GET['path'],'mojang/')!=False){//目录分组
				if(strstr($_GET['path'],'mojang/launchermeta/')!=False){
					$dir='mojang/launchermeta/';
					check_file_update('mojang/launchermeta/mc/game/version_manifest.json',$dir,'http://launchermeta.mojang.com');
				}
			}elseif(strstr($_GET['path'],'forge/')!=False){//目录分组
				if(strstr($_GET['path'],'forge/last')!=False){
					check_file_update_adv('forge/last','https://download.mcbbs.net/forge/last','https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar');
				}
			}
		}else{//无需更新的文件，直接重定向
			if(strstr($_GET['path'],'forge/minecraft')!=False){//特殊返回目录
				echo @file_get_contents($_GET['path']);
			}else{
				header('Location: http://1.gemcapi.ghink.net:10000/'.$_GET['path']);
			}
		}
	}elseif(is_dir($_GET['path'])){
		//目录存在
		if(strstr($_GET['path'],'forge/minecraft')!=False){//特殊目录返回
			check_file_update_adv('forge/minecraft/index.json','https://download.mcbbs.net/forge/minecraft','https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar');
		}else{
			header('Location: http://1.gemcapi.ghink.net:10000/'.$_GET['path']);
		}
	}else{
		//目录或文件不存在
		if(strstr($_GET['path'],'forge/')!=False){//特殊Forge，采用二级源
			if(url_exists_2('https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar')){
				if(strstr($_GET['path'],'forge/minecraft')!=False){//forge/minecraft目录特殊同步
					if($_GET['path']=='forge/minecraft'){
						check_file_update_adv('forge/minecraft/index.json','https://download.mcbbs.net/forge/minecraft','https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar');
					}else{
						check_file_update_adv($_GET['path'],'https://download.mcbbs.net/'.$_GET['path'],'https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar');
					}
				}else{
					download_file('https://download.mcbbs.net/'.$_GET['path'],$_GET['path'],'');
					header('Location: http://1.gemcapi.ghink.net:10000/'.$_GET['path']);
				}
			}else{
				echo '{"wikis":"https://gitee.com/ghink/gemcapi/wikis","code":404,"server_time":"'.date("Y-m-d h:i:s").'"}';
				header('HTTP/1.1 404 Not Found');
			}
		}else{
			if(get_main_domain($_GET['path'])=='mojang'){//分配顶级域名尾
				$id=0;
			}
			if(url_exists(get_online_url($_GET['path'],$id))){
				download_file(get_online_url($_GET['path'],$id),$_GET['path'],'');
				header('Location: http://1.gemcapi.ghink.net:10000/'.$_GET['path']);
			}else{
				echo '{"wikis":"https://gitee.com/ghink/gemcapi/wikis","code":404,"server_time":"'.date("Y-m-d h:i:s").'"}';
				header('HTTP/1.1 404 Not Found');
			}
		}
	}
}