<?php 
error_reporting(0);
ini_set('user_agent', 'GeMCAPI/5.0.0 (GeMC API Sync 5.0.0;Release)');
$active=array('mojang/launchermeta/mc/game/version_manifest.json','forge/last','optifine/versionlist','liteloader/dl/versions/versions.json');
$type=array('.com','.net','.com','.moe');
//[0]:mojang,[1]:fabricmc,[2]:liteloader,[3]:authlib-injector
function url_exists($url){
	$opts = array(
		'http'=>array(
		'timeout'=>3,
		)
	);
	$context = stream_context_create($opts);
	return @file_get_contents($url, false, $context);
}
function download_file($url,$file,$other){//下载文件
    system('python download.py --url "'.$url.'" --file "'.$file.'" --other "'.$other.'"');
}
function get_main_domain($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 $str;
}
function get_online_domain($file,$id){
	global $type;
	$str='http://'.get_sub_domain($file).'.'.get_main_domain($file).$type[$id].'/';
	return $str;
}
function check_file_update($file,$dir,$url,$time){
	global $replace_mode;
	if($replace_mode==true){
		$file=str_replace('?','/',$file);
	}
	header('Content-Disposition: attachment; filename="'.basename($file).'"');
	$time=time()-@filemtime($file);
	if($time<$time){//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));
				download_file($url.'/'.str_replace($dir,'',$file),$file,'');
			}
		}else{
			echo file_get_contents($file);
		}
	}
}
function check_file_update_json($file,$dir,$url,$time){
	global $replace_mode;
	if($replace_mode==true){
		$file=str_replace('?','/',$file);
	}
	header('Content-Disposition: attachment; filename="'.basename($file).'.json"');
	$time=time()-@filemtime($file.'/index.json');
	if($time<$time){//检查文件是否超出过期期限（1天，86400秒）
		echo file_get_contents($file.'/index.json');
	}else{
		if(url_exists($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.'/index.json')){
				echo file_get_contents($file);
			}else{
				echo file_get_contents($url.'/'.str_replace($dir,'',$file));
				download_file($url.'/'.str_replace($dir,'',$file),$file.'/index.json','');
			}
		}else{
			echo file_get_contents($file.'/index.json');
		}
	}
}
function check_file_update_jar($file,$dir,$url,$time){
	global $replace_mode;
	if($replace_mode==true){
		$file=str_replace('?','/',$file);
	}
	header('Content-Disposition: attachment; filename="'.basename($file).'.jar"');
	$time=time()-@filemtime($file.'/index.jar');
	if($time<$time){//检查文件是否超出过期期限（1天，86400秒）
		echo file_get_contents($file.'/index.jar');
	}else{
		if(url_exists($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.'/index.jar')){
				echo file_get_contents($file);
			}else{
				echo file_get_contents($url.'/'.str_replace($dir,'',$file));
				download_file($url.'/'.str_replace($dir,'',$file),$file.'/index.jar','');
			}
		}else{
			echo file_get_contents($file.'/index.jar');
		}
	}
}
function check_file_update_adv($file,$url,$check_url){
	global $replace_mode;
	if($replace_mode==true){
		$file=str_replace('?','/',$file);
	}
	header('Content-Disposition: attachment; filename="'.basename($file).'"');
	$time=time()-@filemtime($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($check_url)){//防止源无法访问而损坏文件
			if(file_get_contents($url)==@file_get_contents($file)){
				echo file_get_contents($file);
			}else{
				echo @file_get_contents($url);
				download_file($url,$file,'');
			}
		}else{
			echo file_get_contents($file);
		}
	}
}
if(strstr($_GET['path'],'liteloader')!=False){//替换掉Literloader源中的特殊字符
	$replace_mode=true;
}
if(get_main_domain($_GET['path'])=='mojang'){//分配顶级域名尾
	$id=0;
}elseif(get_main_domain($_GET['path'])=='fabricmc'){
	$id=1;
}elseif(get_main_domain($_GET['path'])=='liteloader'){
	$id=2;
}elseif(get_main_domain($_GET['path'])=='yushi'){
	$id=3;
}
if($_GET['error']!=""){
	echo '{"wikis":"https://gitee.com/ghink/gemcapi/wikis","code":'.$_GET['error'].',"server_time":'.time().'}';
}elseif($_GET['path']==""){
	echo '{"wikis":"https://gitee.com/ghink/gemcapi/wikis","code":200,"server_time":'.time().'}';
}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($_GET['path'],'mojang/launchermeta/')!=False){
					check_file_update('mojang/launchermeta/mc/game/version_manifest.json',get_main_domain($_GET['path']).'/'.get_sub_domain($_GET['path']).'/','http://launchermeta.mojang.com',86400);
				}
			}elseif(strstr($_GET['path'],'forge/')!=False){//目录分组
				if(strstr($_GET['path'],'forge/last')!=False){
					check_file_update_adv('forge/last/index.json','https://download.mcbbs.net/forge/last','https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar');
				}
			}elseif(strstr($_GET['path'],'optifine/')!=False){//目录分组
				if(strstr($_GET['path'],'optifine/versionlist')!=False){
					check_file_update_adv('optifine/versionlist/index.json','https://download.mcbbs.net/optifine/versionlist','https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar');
				}
			}elseif(strstr($_GET['path'],'liteloader/')!=False){//目录分组
				if(strstr($_GET['path'],'liteloader/dl/versions')!=False){
					check_file_update_adv('liteloader/dl/versions/versions.json','http://dl.liteloader.com/versions/versions.json','http://dl.liteloader.com/versions/versions.json');
				}
			}
		}else{//无需频繁更新的文件
			if(@file_get_contents(get_online_url($_GET['path'],$id)=="")){
				check_file_update($_GET['path'],get_main_domain($_GET['path']).'/'.get_sub_domain($_GET['path']).'/',get_online_domain($_GET['path'],$id),2592000);
			}else{
				check_file_update_json($_GET['path'],get_main_domain($_GET['path']).'/'.get_sub_domain($_GET['path']).'/',get_online_domain($_GET['path'],$id),2592000);
			}
		}
	}elseif(is_dir($_GET['path'])){
		//目录存在
		if(strstr($_GET['path'],'forge/minecraft')!=False){//特殊目录返回
			check_file_update_adv('forge/minecraft/minecraft.json','https://download.mcbbs.net/forge/minecraft','https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar');
		}elseif(strstr($_GET['path'],'yushi/authlib-injector')!=False){
			check_file_update_adv('yushi/authlib-injector/list.json','https://authlib-injector.yushi.moe','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');
			//此处暂时使用bmclapi源检测文件欺骗检测authlib-injector，原因见底部注释
		}elseif(is_file($_GET['path'].'/index.json')){
			check_file_update_json($_GET['path'],get_main_domain($_GET['path']).'/'.get_sub_domain($_GET['path']).'/',get_online_domain($_GET['path'],$id),86400);
		}elseif(is_file($_GET['path'].'/index.jar')){
			check_file_update_jar($_GET['path'],get_main_domain($_GET['path']).'/'.get_sub_domain($_GET['path']).'/',get_online_domain($_GET['path'],$id),31536000);
		}else{
			header('Content-Disposition: attachment; filename="'.basename($_GET['path']).'"');
			echo file_get_contents($_GET['path']);
		}
	}else{
		//目录或文件不存在
		if(strstr($_GET['path'],'forge/')!=False){//特殊Forge，采用二级源 BMCLAPI
			if(url_exists('https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar')){
				if(strstr($_GET['path'],'forge/minecraft')!=False){//forge/minecraft目录特殊同步
					if($_GET['path']=='forge/minecraft'){
						check_file_update_adv('forge/minecraft/minecraft.json','https://download.mcbbs.net/forge/minecraft','https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar');
					}else{
						check_file_update_adv($_GET['path'].'/index.json','https://download.mcbbs.net/'.$_GET['path'],'https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar');
					}
				}elseif(strstr($_GET['path'],'forge/last')!=False){
					check_file_update_adv($_GET['path'].'/index.json','https://download.mcbbs.net/'.$_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');
				}elseif(strstr($_GET['path'],'forge/download')!=False){//forge/download目录特殊同步
					check_file_update_adv($_GET['path'].'/index.jar','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'],$_GET['path'],'');
					header('Content-Disposition: attachment; filename="'.basename($_GET['path']).'"');
					echo file_get_contents($_GET['path']);
				}
			}else{
				echo '{"wikis":"https://gitee.com/ghink/gemcapi/wikis","code":404,"server_time":'.time().'}';
				header('HTTP/1.1 404 Not Found');
			}
		}elseif(strstr($_GET['path'],'optifine/')!=False){//Optifine同步
			if($_GET['path']=='optifine'){
				echo '{"wikis":"https://gitee.com/ghink/gemcapi/wikis","code":404,"server_time":'.time().'}';
				header('HTTP/1.1 404 Not Found');
			}elseif(strstr($_GET['path'],'optifine/versionlist')!=False){
				check_file_update_adv(str_replace('?','/',$_GET['path']).'/index.json','https://download.mcbbs.net/'.$_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{
				if(@file_get_contents(get_online_url($_GET['path'],$id)=="")){
					check_file_update_adv($_GET['path'].'/index.jar','https://download.mcbbs.net/'.$_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{
					if(strstr($_GET['path'],'HD_U')!=False){
						check_file_update_adv($_GET['path'].'/index.jar','https://download.mcbbs.net/'.$_GET['path'],'https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar');
					}else{
						check_file_update_adv($_GET['path'].'/index.json','https://download.mcbbs.net/'.$_GET['path'],'https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar');
					}
				}
			}
		}elseif(strstr($_GET['path'],'liteloader/')!=False){//Liteloader同步
			if(strstr($_GET['path'],'liteloader/list')!=False){
				check_file_update_adv(str_replace('?','/',$_GET['path']).'/index.json','https://download.mcbbs.net/'.$_GET['path'],'https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar');
			}elseif(strstr($_GET['path'],'liteloader/download')!=False){
				check_file_update_adv(str_replace('?','/',$_GET['path']).'/index.jar','https://download.mcbbs.net/'.$_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{
				check_file_update_adv($_GET['path'],get_online_url($_GET['path'],$id),'http://dl.liteloader.com/versions/versions.json');
			}
		}else{
			if(url_exists(get_online_url($_GET['path'],$id))){
				if(@file_get_contents(get_online_url($_GET['path'],$id)=="")){
					download_file(get_online_url($_GET['path'],$id),$_GET['path'],'');
					header('Content-Disposition: attachment; filename="'.basename($_GET['path']).'"');
					echo file_get_contents($_GET['path']);
				}else{
					download_file(get_online_url($_GET['path'],$id),$_GET['path'].'/index.json','');
					header('Content-Disposition: attachment; filename="'.basename($_GET['path']).'"');
					echo file_get_contents($_GET['path'].'/index.json');
				}
			}elseif(get_main_domain($_GET['path'])=='yushi'){
				//暂不明确为何authlib-injector的服务器即使存活文件存在也会被判定为不存在
				download_file(get_online_url($_GET['path'],$id),$_GET['path'].'/list.json','');
				header('Content-Disposition: attachment; filename="'.basename($_GET['path']).'"');
				echo file_get_contents($_GET['path'].'/list.json');
			}else{
				echo '{"wikis":"https://gitee.com/ghink/gemcapi/wikis","code":404,"server_time":'.time().'}';
				header('HTTP/1.1 404 Not Found');
			}
		}
	}
}