<?php 
error_reporting(0);//抑制部分无关紧要的报错
/*---------------------
6.0.0正在开发，请不要使用
6.0.0正在开发，请不要使用
6.0.0正在开发，请不要使用
---------------------*/
ini_set('user_agent', 'GeMCAPI/6.0.0 (GeMC API Sync 6.0.0;Release)');//设置默认UA
$server_id=1;//服务器的ID
$active=array('mojang/launchermeta/mc/game/version_manifest.json','forge/last','optifine/versionlist','liteloader/dl/versions/versions.json','forge/minecraft');//需要保持最新的文件
$type=array('.com','.net','.com','.moe','.net');//分配域名
//[0]:mojang,[1]:fabricmc,[2]:liteloader,[3]:authlib-injector,[4]:minecraft
function is_url_exists($url){
	$opts = array(
		'http'=>array(
		'timeout'=>3,
		)
	);
	$context = stream_context_create($opts);
	return @file_get_contents($url, false, $context);//尝试访问文件，无法访问则不存在
}
function download_file($url,$file,$type,$type_sub){
	global $link;
	ob_start();
	$result_download=system('python download.py --url "'.$url.'" --file "'.$file.'" --type "'.$type.'" --type_sub "'.$type_sub.'"');
	ob_clean();
	//echo $result_download;
	//echo 'python download.py --url "'.$url.'" --file "'.$file.'" --type "'.$type.'" --type_sub "'.$type_sub.'"';
	mysqli_query($link,$result_download);
	//使用Python下载，避开了PHP下载文件的不稳定劣势
}
function get_main_domain($file){
	//使用正则表达式筛选信息
	$str=preg_replace('/^[^\/]*\//is','',$file);
	$str2=str_replace('/'.$str,'',$file);
	return $str2;
}
function get_sub_domain($file){
	//使用正则表达式筛选信息
	$str=preg_replace('/^[^\/]*\//is','',$file);
	$str2=preg_replace('/^[^\/]*\//is','',$str);
	$str3=str_replace('/'.$str2,'',$str);
	return $str3;
}
function get_file_path($file){
	//使用正则表达式筛选信息
	$str=preg_replace('/^[^\/]*\//is','',$file);
	$str2=preg_replace('/^[^\/]*\//is','',$str);
	return $str2;
}
function get_online_url($file){
	//字符串拼接用函数
	global $type;
	global $id;
	if(strstr($file,"maven")){
		$str="https://bmclapi2.bangbang93.com/".$file;
	}elseif(strstr($file,"forge/")){
		$str="https://bmclapi2.bangbang93.com/".$file;
	}elseif(strstr($file,"optifine/")){
		$str="https://bmclapi2.bangbang93.com/".$file;
	}elseif(strstr($file,"liteloader/list")){
		$str="https://bmclapi2.bangbang93.com/".str_replace('list/','list?',$file);
	}else{
		$str='https://'.get_sub_domain($file).'.'.get_main_domain($file).$type[$id].'/'.get_file_path($file);
	}
	return $str;
}
function get_online_domain($file){
	//字符串拼接用函数
	global $type;
	global $id;
	$str='https://'.get_sub_domain($file).'.'.get_main_domain($file).$type[$id].'/';
	return $str;
}
function output_file($array){
	header('Content-type: '.$array['header']);
	if($array['header']=="application/json"){
		//是JSON文件，不强制下载
	}else{
		//非JSON文件，直接强制下载
		header('Content-Disposition: attachment; filename="'.basename($array['file']).'"');
	}
	echo file_get_contents($array['file']);
}
function check_file_update($file,$url,$time){
	global $result;
	if(is_file('file/'.$file)){//判断本地文件是否存在
		$time=time()-@filemtime('file/'.$file);
		if($time<$time){//检查文件是否超出过期期限
			echo file_get_contents('file/'.$file);
		}else{
			if(is_url_exists($url)){//防止源无法访问而损坏文件
				if(file_get_contents($url)==@file_get_contents('file/'.$file)){
					echo file_get_contents('file/'.$file);
				}else{
					ob_start();
					system('python download.py --url "'.$url.'" --file "'.$file.'" --type "pass" --type_sub "pass"');
					ob_clean();
					echo file_get_contents('file/'.$file);
				}
			}else{
				echo file_get_contents('file/'.$file);
			}
		}
	}else{
		ob_start();
		system('python download.py --url "'.$url.'" --file "'.$file.'" --type "pass" --type_sub "pass"');
		ob_clean();
		echo file_get_contents('file/'.$file);
	}
}
function is_server_alive($file){
	global $type;
	global $id;
	$url='https://'.get_sub_domain($file).'.'.get_main_domain($file).$type[$id];
	$opts = array(
		'http'=>array(
		'timeout'=>3,
		)
	);
	$context = stream_context_create($opts);
	return @file_get_contents($url, false, $context);//尝试访问文件，无法访问则不存在
}
if(strstr($_GET['path'],'?')!=False){//判断有无特殊字符
	$get_path=str_replace('?','/',$_GET['path']);
}else{
	$get_path=$_GET['path'];
}
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'){
	$id=3;
}elseif(get_main_domain($get_path)=='minecraft'){
	$id=4;
}
if($_GET['error']!=""){
	header('Content-type: application/json');
	echo '{"wikis":"https://gitee.com/ghink/gemcapi/wikis","code":'.$_GET['error'].',"server_time":'.time().',"server_id":'.$server_id.'}';
}elseif($get_path==""){
	header('Content-type: application/json');
	echo '{"wikis":"https://gitee.com/ghink/gemcapi/wikis","code":200,"server_time":'.time().',"server_id":'.$server_id.'}';
}else{
	$link=mysqli_connect("localhost","gemcapi","ghink2014","gemcapi");
	$result=mysqli_query($link,"SELECT * FROM `common` WHERE `path` = '".$get_path."';");
	$result=mysqli_fetch_array($result);
	if(in_array($get_path,$active)){
		//需要保持最新的文件，不进行数据库操作
		if(strstr($get_path,'mojang/')!=False){//目录分组
			if(strstr($get_path,'mojang/launchermeta/')!=False){
				header('Content-type: application/json');
				check_file_update('mojang/launchermeta/mc/game/version_manifest.json','https://launchermeta.mojang.com/mc/game/version_manifest.json','http://launchermeta.mojang.com',86400);
			}
		}elseif(strstr($get_path,'forge/')!=False){//目录分组
			if(strstr($get_path,'forge/last')!=False){
				header('Content-type: application/json');
				check_file_update('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',86400);
			}elseif(strstr($get_path,'forge/minecraft')!=False){
				header('Content-type: application/json');
				check_file_update('forge/minecraft/index.json','https://download.mcbbs.net/forge/minecraft','https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar',86400);
			}
		}elseif(strstr($get_path,'optifine/')!=False){//目录分组
			if(strstr($get_path,'optifine/versionlist')!=False){
				header('Content-type: application/json');
				check_file_update('optifine/versionlist/index.json','https://download.mcbbs.net/optifine/versionlist','https://download.mcbbs.net/maven/net/minecraftforge/forge/1.7.10-10.13.0.1151/forge-1.7.10-10.13.0.1151-installer.jar',86400);
			}
		}elseif(strstr($get_path,'liteloader/')!=False){//目录分组
			if(strstr($get_path,'liteloader/dl/versions')!=False){
				header('Content-type: application/json');
				check_file_update('liteloader/dl/versions/versions.json','http://dl.liteloader.com/versions/versions.json','http://dl.liteloader.com/versions/versions.json',86400);
			}
		}
	}else{
		if(strstr($get_path,'forge/list')!=False){//其他特殊同步文件
			check_file_update($get_path.'/index.json','https://bmclapi2.bangbang93.com/'.$get_path,'https://bmclapi2.bangbang93.com/forge/list/1',86400);
		}elseif(empty($result)){//普通文件
			//数据库中没有记录该文件
			download_file(get_online_url($get_path),$get_path,get_main_domain($get_path),'common');
			header("refresh: 0");
		}else{
			//数据库中记录了该文件
			if(is_file($result['file'])){//判断本地文件是否存在
				//文件存在
				output_file($result);
			}else{
				//文件不存在
				mysqli_query($link,"DELETE FROM `common` WHERE `path`='".$get_path."'");
				header("refresh: 0");
			}
		}
	}
}