178 lines
3.7 KiB
PHP
178 lines
3.7 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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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, string $ip){
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// parse proxy line
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[
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$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 . ":" . $port);
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break;
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case "socks5_hostname":
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case "socks5a":
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curl_setopt($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(string $payload, string $page, string $proxy){
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$key = sodium_crypto_secretbox_keygen();
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$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);
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$requestid = apcu_inc("requestid");
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apcu_store(
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$page[0] . "." . // first letter of page name
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$this->scraper . // scraper name
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$requestid,
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[
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$nonce,
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$proxy,
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// compress and encrypt
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sodium_crypto_secretbox(
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gzdeflate($payload),
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$nonce,
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$key
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)
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],
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900 // cache information for 15 minutes
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);
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return
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$this->scraper . $requestid . "." .
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rtrim(strtr(base64_encode($key), '+/', '-_'), '=');
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}
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public function get(string $npt, string $page){
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$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 next page token 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($key) % 4,
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'=',
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STR_PAD_RIGHT
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)
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);
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// decrypt and decompress data
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$payload[2] =
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gzinflate(
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sodium_crypto_secretbox_open(
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$payload[2], // data
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$payload[0], // nonce
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$key
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)
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);
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if($payload[2] === false){
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throw new Exception("The next page token is invalid or has expired!");
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}
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// remove the key after using successfully
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apcu_delete($apcu);
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return [
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$payload[2], // data
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$payload[1] // proxy
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];
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}
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}
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