forked from lolcat/4get
652 lines
13 KiB
PHP
652 lines
13 KiB
PHP
<?php
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class proxy{
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public const req_web = 0;
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public const req_image = 1;
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public function __construct($cache = true){
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$this->cache = $cache;
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}
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public function do404(){
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http_response_code(404);
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header("Content-Type: image/png");
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$handle = fopen("lib/img404.png", "r");
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echo fread($handle, filesize("lib/img404.png"));
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fclose($handle);
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die();
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return;
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}
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public function getabsoluteurl($path, $relative){
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if($this->validateurl($path)){
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return $path;
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}
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if(substr($path, 0, 2) == "//"){
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return "https:" . $path;
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}
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$url = null;
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$relative = parse_url($relative);
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$url = $relative["scheme"] . "://";
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if(
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isset($relative["user"]) &&
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isset($relative["pass"])
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){
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$url .= $relative["user"] . ":" . $relative["pass"] . "@";
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}
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$url .= $relative["host"];
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if(isset($relative["path"])){
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$relative["path"] = explode(
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"/",
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$relative["path"]
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);
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unset($relative["path"][count($relative["path"]) - 1]);
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$relative["path"] = implode("/", $relative["path"]);
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$url .= $relative["path"];
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}
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if(
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strlen($path) !== 0 &&
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$path[0] !== "/"
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){
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$url .= "/";
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}
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$url .= $path;
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return $url;
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}
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public function validateurl($url){
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$url_parts = parse_url($url);
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// check if required parts are there
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if(
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!isset($url_parts["scheme"]) ||
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!(
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$url_parts["scheme"] == "http" ||
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$url_parts["scheme"] == "https"
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) ||
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!isset($url_parts["host"])
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){
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return false;
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}
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$ip =
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str_replace(
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["[", "]"], // handle ipv6
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"",
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$url_parts["host"]
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);
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// if its not an IP
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if(!filter_var($ip, FILTER_VALIDATE_IP)){
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// resolve domain's IP
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$ip = gethostbyname($url_parts["host"] . ".");
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}
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// check if its localhost
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if(
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filter_var(
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$ip,
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FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE
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) === false
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){
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return false;
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}
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return true;
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}
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public function get($url, $reqtype = self::req_web, $acceptallcodes = false, $referer = null, $redirectcount = 0){
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if($redirectcount === 5){
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throw new Exception("Too many redirects");
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}
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if($url == "https://i.imgur.com/removed.png"){
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throw new Exception("Encountered imgur 404");
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}
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// sanitize URL
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if($this->validateurl($url) === false){
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throw new Exception("Invalid URL");
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}
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$this->clientcache();
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$curl = curl_init();
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curl_setopt($curl, CURLOPT_URL, $url);
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curl_setopt($curl, CURLOPT_ENCODING, ""); // default encoding
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curl_setopt($curl, CURLOPT_HEADER, 1);
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switch($reqtype){
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case self::req_web:
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curl_setopt(
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$curl,
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CURLOPT_HTTPHEADER,
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[
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"User-Agent: " . config::USER_AGENT,
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"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8",
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"Accept-Language: en-US,en;q=0.5",
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"Accept-Encoding: gzip, deflate",
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"DNT: 1",
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"Connection: keep-alive",
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"Upgrade-Insecure-Requests: 1",
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"Sec-Fetch-Dest: document",
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"Sec-Fetch-Mode: navigate",
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"Sec-Fetch-Site: none",
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"Sec-Fetch-User: ?1"
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]
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);
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break;
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case self::req_image:
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if($referer === null){
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$referer = explode("/", $url, 4);
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array_pop($referer);
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$referer = implode("/", $referer);
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}
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curl_setopt(
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$curl,
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CURLOPT_HTTPHEADER,
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[
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"User-Agent: " . config::USER_AGENT,
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"Accept: image/avif,image/webp,*/*",
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"Accept-Language: en-US,en;q=0.5",
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"Accept-Encoding: gzip, deflate",
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"DNT: 1",
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"Connection: keep-alive",
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"Referer: {$referer}"
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]
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);
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break;
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}
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curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
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curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
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curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
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curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 30);
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curl_setopt($curl, CURLOPT_TIMEOUT, 30);
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// limit size of payloads
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curl_setopt($curl, CURLOPT_BUFFERSIZE, 1024);
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curl_setopt($curl, CURLOPT_NOPROGRESS, false);
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curl_setopt(
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$curl,
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CURLOPT_PROGRESSFUNCTION,
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function($downloadsize, $downloaded, $uploadsize, $uploaded
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){
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// if $downloaded exceeds 100MB, fuck off
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return ($downloaded > 100000000) ? 1 : 0;
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});
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$body = curl_exec($curl);
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if(curl_errno($curl)){
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throw new Exception(curl_error($curl));
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}
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curl_close($curl);
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$headers = [];
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$http = null;
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while(true){
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$header = explode("\n", $body, 2);
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$body = $header[1];
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if($http === null){
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// http/1.1 200 ok
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$header = explode("/", $header[0], 2);
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$header = explode(" ", $header[1], 3);
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$http = [
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"version" => (float)$header[0],
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"code" => (int)$header[1]
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];
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continue;
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}
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if(trim($header[0]) == ""){
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// reached end of headers
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break;
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}
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$header = explode(":", $header[0], 2);
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// malformed headers
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if(count($header) !== 2){ continue; }
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$headers[strtolower(trim($header[0]))] = trim($header[1]);
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}
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// check http code
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if(
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$http["code"] >= 300 &&
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$http["code"] <= 309
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){
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// redirect
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if(!isset($headers["location"])){
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throw new Exception("Broken redirect");
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}
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$redirectcount++;
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return $this->get($this->getabsoluteurl($headers["location"], $url), $reqtype, $acceptallcodes, $referer, $redirectcount);
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}else{
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if(
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$acceptallcodes === false &&
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$http["code"] > 300
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){
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throw new Exception("Remote server returned an error code! ({$http["code"]})");
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}
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}
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// check if data is okay
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switch($reqtype){
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case self::req_image:
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$format = false;
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if(isset($headers["content-type"])){
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if($headers["content-type"] == "text/html"){
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throw new Exception("Server returned an html document instead of image");
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}
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$tmp = explode(";", $headers["content-type"]);
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for($i=0; $i<count($tmp); $i++){
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if(
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preg_match(
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'/^image\/([^ ]+)/i',
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$tmp[$i],
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$match
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)
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){
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$format = strtolower($match[1]);
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if(substr($format, 0, 2) == "x-"){
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$format = substr($format, 2);
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}
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break;
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}
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}
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}
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return [
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"http" => $http,
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"format" => $format,
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"headers" => $headers,
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"body" => $body
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];
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break;
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default:
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return [
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"http" => $http,
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"headers" => $headers,
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"body" => $body
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];
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break;
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}
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return;
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}
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public function stream_linear_image($url, $referer = null){
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$this->stream($url, $referer, "image");
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}
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public function stream_linear_audio($url, $referer = null){
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$this->stream($url, $referer, "audio");
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}
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private function stream($url, $referer, $format){
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$this->url = $url;
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$this->format = $format;
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// sanitize URL
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if($this->validateurl($url) === false){
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throw new Exception("Invalid URL");
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}
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$this->clientcache();
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$curl = curl_init();
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// set headers
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if($referer === null){
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$referer = explode("/", $url, 4);
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array_pop($referer);
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$referer = implode("/", $referer);
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}
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switch($format){
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case "image":
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curl_setopt(
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$curl,
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CURLOPT_HTTPHEADER,
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[
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"User-Agent: " . config::USER_AGENT,
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"Accept: image/avif,image/webp,*/*",
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"Accept-Language: en-US,en;q=0.5",
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"Accept-Encoding: gzip, deflate, br",
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"DNT: 1",
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"Connection: keep-alive",
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"Referer: {$referer}"
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]
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);
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break;
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case "audio":
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curl_setopt(
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$curl,
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CURLOPT_HTTPHEADER,
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[
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"User-Agent: " . config::USER_AGENT,
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"Accept: audio/webm,audio/ogg,audio/wav,audio/*;q=0.9,application/ogg;q=0.7,video/*;q=0.6,*/*;q=0.5",
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"Accept-Language: en-US,en;q=0.5",
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"Accept-Encoding: gzip, deflate, br",
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"DNT: 1",
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"Connection: keep-alive",
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"Referer: {$referer}"
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]
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);
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break;
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}
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// follow redirects
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curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
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curl_setopt($curl, CURLOPT_MAXREDIRS, 5);
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curl_setopt($curl, CURLOPT_AUTOREFERER, 5);
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// set url
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curl_setopt($curl, CURLOPT_URL, $url);
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curl_setopt($curl, CURLOPT_ENCODING, ""); // default encoding
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// timeout + disable ssl
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curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
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curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
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curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 10);
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curl_setopt($curl, CURLOPT_TIMEOUT, 30);
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curl_setopt(
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$curl,
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CURLOPT_WRITEFUNCTION,
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function($c, $data){
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if(curl_getinfo($c, CURLINFO_HTTP_CODE) !== 200){
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throw new Exception("Serber returned a non-200 code");
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}
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echo $data;
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return strlen($data);
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}
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);
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$this->empty_header = false;
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$this->cont = false;
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$this->headers_tmp = [];
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$this->headers = [];
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curl_setopt(
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$curl,
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CURLOPT_HEADERFUNCTION,
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function($c, $header){
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$head = trim($header);
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$len = strlen($head);
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if($len === 0){
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$this->empty_header = true;
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$this->headers_tmp = [];
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}else{
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$this->empty_header = false;
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$this->headers_tmp[] = $head;
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}
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foreach($this->headers_tmp as $h){
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// parse headers
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$h = explode(":", $h, 2);
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if(count($h) !== 2){
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if(curl_getinfo($c, CURLINFO_HTTP_CODE) !== 200){
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// not HTTP 200, probably a redirect
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$this->cont = false;
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}else{
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$this->cont = true;
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}
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// is HTTP 200, just ignore that line
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continue;
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}
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$this->headers[strtolower(trim($h[0]))] = trim($h[1]);
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}
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if(
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$this->cont &&
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$this->empty_header
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){
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// get content type
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if(isset($this->headers["content-type"])){
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$filetype = explode("/", $this->headers["content-type"]);
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if(strtolower($filetype[0]) != $this->format){
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throw new Exception("Resource is not an {$this->format} (Found {$filetype[0]} instead)");
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}
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}else{
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throw new Exception("Resource is not an {$this->format} (no Content-Type)");
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}
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header("Content-Type: {$this->format}/{$filetype[1]}");
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// give payload size
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if(isset($this->headers["content-length"])){
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header("Content-Length: {$this->headers["content-length"]}");
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}
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// give filename
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$this->getfilenameheader($this->headers, $this->url, $filetype[1]);
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}
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return strlen($header);
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}
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);
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curl_exec($curl);
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if(curl_errno($curl)){
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throw new Exception(curl_error($curl));
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}
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curl_close($curl);
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}
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public function getfilenameheader($headers, $url, $filetype = "jpg"){
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// get filename from content-disposition header
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if(isset($headers["content-disposition"])){
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preg_match(
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'/filename=([^;]+)/',
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$headers["content-disposition"],
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$filename
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);
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if(isset($filename[1])){
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header("Content-Disposition: filename=" . $filename[1] . "." . $filetype);
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return;
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}
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}
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// get filename from URL
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$filename = parse_url($url, PHP_URL_PATH);
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if($filename === null){
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// everything failed! rename file to domain name
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header("Content-Disposition: filename=" . parse_url($url, PHP_URL_HOST) . "." . $filetype);
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return;
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}
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// remove extension from filename
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$filename =
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explode(
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".",
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basename($filename)
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);
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if(count($filename) > 1){
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array_pop($filename);
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}
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$filename = implode(".", $filename);
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header("Content-Disposition: inline; filename=" . $filename . "." . $filetype);
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return;
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}
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public function getimageformat($payload, &$imagick){
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$finfo = new finfo(FILEINFO_MIME_TYPE);
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$format = $finfo->buffer($payload["body"]);
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if($format === false){
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if($payload["format"] === false){
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header("X-Error: Could not parse format");
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$this->favicon404();
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}
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$format = $payload["format"];
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}else{
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$format_tmp = explode("/", $format, 2);
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if($format_tmp[0] == "image"){
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$format_tmp = strtolower($format_tmp[1]);
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if(substr($format_tmp, 0, 2) == "x-"){
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$format_tmp = substr($format_tmp, 2);
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}
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$format = $format_tmp;
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}
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}
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switch($format){
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case "tiff": $format = "gif"; break;
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case "vnd.microsoft.icon": $format = "ico"; break;
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case "icon": $format = "ico"; break;
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case "svg+xml": $format = "svg"; break;
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}
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$imagick = new Imagick();
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if(
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!in_array(
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$format,
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array_map("strtolower", $imagick->queryFormats())
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)
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){
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// format could not be found, but imagemagick can
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// sometimes detect it? shit's fucked
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$format = false;
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}
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return $format;
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}
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public function clientcache(){
|
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|
|
if($this->cache === false){
|
|
|
|
return;
|
|
}
|
|
|
|
header("Last-Modified: Thu, 01 Oct 1970 00:00:00 GMT");
|
|
$headers = getallheaders();
|
|
|
|
if(
|
|
isset($headers["If-Modified-Since"]) ||
|
|
isset($headers["If-Unmodified-Since"])
|
|
){
|
|
|
|
http_response_code(304); // 304: Not Modified
|
|
die();
|
|
}
|
|
}
|
|
}
|