mirror of
https://git.lolcat.ca/lolcat/4get.git
synced 2024-11-29 18:04:18 -05:00
198 lines
4 KiB
PHP
198 lines
4 KiB
PHP
<?php
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class backend{
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public function __construct($scraper){
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$this->scraper = $scraper;
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}
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/*
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Proxy stuff
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*/
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public function get_ip(){
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$pool = constant("config::PROXY_" . strtoupper($this->scraper));
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if($pool === false){
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// we don't want a proxy, fuck off!
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return 'raw_ip::::';
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}
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// indent
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$proxy_index_raw = apcu_inc("p." . $this->scraper);
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$proxylist = file_get_contents("data/proxies/" . $pool . ".txt");
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$proxylist = explode("\n", $proxylist);
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// ignore empty or commented lines
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$proxylist = array_filter($proxylist, function($entry){
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$entry = ltrim($entry);
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return strlen($entry) > 0 && substr($entry, 0, 1) != "#";
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});
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$proxylist = array_values($proxylist);
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echo $proxy_index_raw % count($proxylist);
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return $proxylist[$proxy_index_raw % count($proxylist)];
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}
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// this function is also called directly on nextpage
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public function assign_proxy(&$curlproc, $ip){
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// parse proxy line
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[
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$type,
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$address,
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$port,
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$username,
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$password
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] = explode(":", $ip, 5);
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switch($type){
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case "raw_ip":
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return;
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break;
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case "http":
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case "https":
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curl_setopt($curlproc, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);
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curl_setopt($curlproc, CURLOPT_PROXY, $type . "://" . $address . ":" . $port);
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break;
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case "socks4":
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curl_setopt($curlproc, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
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curl_setopt($curlproc, CURLOPT_PROXY, $address . ":" . $port);
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break;
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case "socks5":
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curl_setopt($curlproc, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
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curl_setopt($curlproc, CURLOPT_PROXY, $address . ":" . $port);
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break;
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case "socks4a":
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curl_setopt($curlproc, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
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curl_setopt($curlproc, CURLOPT_PROXY, $address . ":" . $port);
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break;
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case "socks5_hostname":
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curl_setopt($curlproc, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
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curl_setopt($curlproc, CURLOPT_PROXY, $address . ":" . $port);
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break;
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}
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if($username != ""){
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curl_setopt($curlproc, CURLOPT_PROXYUSERPWD, $username . ":" . $password);
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}
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}
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/*
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Next page stuff
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*/
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public function store($payload, $page, $proxy){
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$page = $page[0];
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$password = random_bytes(256); // 2048 bit
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$salt = random_bytes(16);
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$key = hash_pbkdf2("sha512", $password, $salt, 20000, 32, true);
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$iv =
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random_bytes(
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openssl_cipher_iv_length("aes-256-gcm")
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);
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$tag = "";
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$out = openssl_encrypt($payload, "aes-256-gcm", $key, OPENSSL_RAW_DATA, $iv, $tag, "", 16);
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$requestid = apcu_inc("requestid");
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apcu_store(
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$page . "." .
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$this->scraper .
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$requestid,
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gzdeflate($proxy . "," . $salt.$iv.$out.$tag),
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900 // cache information for 15 minutes blaze it
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);
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return
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$this->scraper . $requestid . "." .
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rtrim(strtr(base64_encode($password), '+/', '-_'), '=');
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}
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public function get($npt, $page){
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$page = $page[0];
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$explode = explode(".", $npt, 2);
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if(count($explode) !== 2){
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throw new Exception("Malformed nextPageToken!");
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}
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$apcu = $page . "." . $explode[0];
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$key = $explode[1];
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$payload = apcu_fetch($apcu);
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if($payload === false){
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throw new Exception("The nextPageToken is invalid or has expired!");
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}
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$key =
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base64_decode(
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str_pad(
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strtr($key, '-_', '+/'),
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strlen($key) % 4,
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'=',
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STR_PAD_RIGHT
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)
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);
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$payload = gzinflate($payload);
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// get proxy
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[
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$proxy,
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$payload
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] = explode(",", $payload, 2);
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$key =
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hash_pbkdf2(
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"sha512",
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$key,
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substr($payload, 0, 16), // salt
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20000,
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32,
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true
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);
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$ivlen = openssl_cipher_iv_length("aes-256-gcm");
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$payload =
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openssl_decrypt(
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substr(
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$payload,
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16 + $ivlen,
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-16
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),
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"aes-256-gcm",
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$key,
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OPENSSL_RAW_DATA,
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substr($payload, 16, $ivlen),
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substr($payload, -16)
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);
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if($payload === false){
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throw new Exception("The nextPageToken is invalid or has expired!");
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}
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// remove the key after using
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apcu_delete($apcu);
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return [$payload, $proxy];
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}
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}
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