436 lines
7.9 KiB
PHP
436 lines
7.9 KiB
PHP
<?php
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class greppr{
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public function __construct(){
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include "lib/backend.php";
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$this->backend = new backend("greppr");
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include "lib/fuckhtml.php";
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$this->fuckhtml = new fuckhtml();
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}
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public function getfilters($page){
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return [];
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}
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private function get($proxy, $url, $get = [], $cookie = false){
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$curlproc = curl_init();
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if($get !== []){
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$get = http_build_query($get);
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$url .= "?" . $get;
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}
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curl_setopt($curlproc, CURLOPT_URL, $url);
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curl_setopt($curlproc, CURLOPT_ENCODING, ""); // default encoding
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if($cookie === false){
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curl_setopt($curlproc, CURLOPT_HTTPHEADER,
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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",
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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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}else{
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curl_setopt($curlproc, CURLOPT_HTTPHEADER,
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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",
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"Cookie: PHPSESSID=" . $cookie,
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"DNT: 1",
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"Connection: keep-alive",
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"Upgrade-Insecure-Requests: 1",
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"Sec-Fetch-Dest: document",
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"Sec-Fetch-Mode: navigate",
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"Sec-Fetch-Site: none",
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"Sec-Fetch-User: ?1"]
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);
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}
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curl_setopt($curlproc, CURLOPT_RETURNTRANSFER, true);
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curl_setopt($curlproc, CURLOPT_SSL_VERIFYHOST, 2);
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curl_setopt($curlproc, CURLOPT_SSL_VERIFYPEER, true);
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curl_setopt($curlproc, CURLOPT_CONNECTTIMEOUT, 30);
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curl_setopt($curlproc, CURLOPT_TIMEOUT, 30);
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$this->backend->assign_proxy($curlproc, $proxy);
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$headers = [];
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curl_setopt(
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$curlproc,
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CURLOPT_HEADERFUNCTION,
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function($curlproc, $header) use (&$headers){
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$len = strlen($header);
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$header = explode(':', $header, 2);
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if(count($header) < 2){
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// ignore invalid headers
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return $len;
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}
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$headers[strtolower(trim($header[0]))] = trim($header[1]);
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return $len;
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}
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);
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$data = curl_exec($curlproc);
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if(curl_errno($curlproc)){
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throw new Exception(curl_error($curlproc));
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}
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curl_close($curlproc);
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return [
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"headers" => $headers,
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"data" => $data
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];
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}
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public function web($get, $first_attempt = true){
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if($get["npt"]){
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[$q, $proxy] = $this->backend->get($get["npt"], "web");
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$q = json_decode($q, true);
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}else{
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$search = $get["s"];
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if(strlen($search) === 0){
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throw new Exception("Search term is empty!");
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}
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$proxy = $this->backend->get_ip();
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}
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// get token
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// token[0] = static token that changes once a day
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// token[1] = dynamic token that changes on every request
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// token[1] = PHPSESSID cookie
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$tokens = apcu_fetch("greppr_token");
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if(
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$tokens === false ||
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$first_attempt === false // force token fetch
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){
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// we haven't gotten the token yet, get it
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try{
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$response =
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$this->get(
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$proxy,
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"https://greppr.org",
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[]
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);
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}catch(Exception $error){
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throw new Exception("Failed to fetch search tokens");
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}
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$tokens = $this->parse_token($response);
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if($tokens === false){
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throw new Exception("Failed to grep search tokens");
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}
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}
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try{
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if($get["npt"]){
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$params = [
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$tokens[0] => $q["q"],
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"s" => $q["s"],
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"l" => 30,
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"n" => $tokens[1]
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];
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}else{
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$params = [
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$tokens[0] => $search,
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"n" => $tokens[1]
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];
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}
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$searchresults = $this->get(
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$proxy,
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"https://greppr.org/search",
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$params,
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$tokens[2]
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);
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}catch(Exception $error){
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throw new Exception("Failed to fetch search page");
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}
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if(strlen($searchresults["data"]) === 0){
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// redirected to main page, which means we got old token
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// generate a new one
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// ... unless we just tried to do that
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if($first_attempt === false){
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throw new Exception("Failed to get a new search token");
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}
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return $this->web($get, false);
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}
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// refresh the token with new data (this also triggers fuckhtml load)
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$this->parse_token($searchresults, $tokens[2]);
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// response object
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$out = [
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"status" => "ok",
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"spelling" => [
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"type" => "no_correction",
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"using" => null,
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"correction" => null
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],
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"npt" => null,
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"answer" => [],
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"web" => [],
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"image" => [],
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"video" => [],
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"news" => [],
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"related" => []
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];
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// get results for later
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$results =
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$this->fuckhtml
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->getElementsByClassName(
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"result",
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"div"
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);
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// check for next page
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$next_elem =
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$this->fuckhtml
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->getElementsByClassName(
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"pagination",
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"ul"
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);
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if(count($next_elem) !== 0){
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$this->fuckhtml->load($next_elem[0]);
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$as =
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$this->fuckhtml
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->getElementsByClassName(
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"page-link",
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"a"
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);
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$break = false;
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foreach($as as $a){
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if($break === true){
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parse_str(
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$this->fuckhtml
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->getTextContent(
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$a["attributes"]["href"]
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),
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$values
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);
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$values = array_values($values);
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$out["npt"] =
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$this->backend->store(
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json_encode(
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[
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"q" => $values[0],
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"s" => $values[1]
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]
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),
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"web",
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$proxy
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);
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break;
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}
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if($a["attributes"]["href"] == "#"){
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$break = true;
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}
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}
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}
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// scrape results
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foreach($results as $result){
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$this->fuckhtml->load($result);
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$a =
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$this->fuckhtml
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->getElementsByTagName(
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"a"
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)[0];
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$description =
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$this->fuckhtml
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->getElementsByClassName(
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"highlightedDesc",
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"p"
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);
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if(count($description) === 0){
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$description = null;
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}else{
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$description =
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$this->limitstrlen(
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$this->fuckhtml
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->getTextContent(
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$description[0]
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)
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);
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}
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$date =
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$this->fuckhtml
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->getElementsByTagName(
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"p"
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);
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$date =
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strtotime(
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explode(
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":",
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$this->fuckhtml
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->getTextContent(
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$date[count($date) - 1]["innerHTML"]
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)
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)[1]
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);
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$out["web"][] = [
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"title" =>
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$this->fuckhtml
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->getTextContent(
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$a["innerHTML"]
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),
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"description" => $description,
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"url" =>
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$this->fuckhtml
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->getTextContent(
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$a["attributes"]["href"]
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),
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"date" => $date,
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"type" => "web",
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"thumb" => [
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"url" => null,
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"ratio" => null
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],
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"sublink" => [],
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"table" => []
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];
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}
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return $out;
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}
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private function parse_token($response, $cookie = false){
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$this->fuckhtml->load($response["data"]);
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$scripts =
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$this->fuckhtml
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->getElementsByTagName("script");
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$found = false;
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foreach($scripts as $script){
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preg_match(
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'/window\.location ?= ?\'\/search\?([^=]+).*&n=([0-9]+)/',
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$script["innerHTML"],
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$tokens
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);
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if(isset($tokens[1])){
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$found = true;
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break;
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}
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}
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if($found === false){
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return false;
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}
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$tokens = [
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$tokens[1],
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$tokens[2]
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];
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if($cookie !== false){
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// we already specified a cookie, so use the one we have already
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$tokens[] = $cookie;
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apcu_store("greppr_token", $tokens);
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return $tokens;
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}
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if(!isset($response["headers"]["set-cookie"])){
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// server didn't send a cookie
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return false;
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}
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// get cookie
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preg_match(
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'/PHPSESSID=([^;]+)/',
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$response["headers"]["set-cookie"],
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$cookie
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);
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if(!isset($cookie[1])){
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// server sent an unexpected cookie
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return false;
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}
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$tokens[] = $cookie[1];
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apcu_store("greppr_token", $tokens);
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return $tokens;
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}
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private function limitstrlen($text){
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return explode("\n", wordwrap($text, 300, "\n"))[0];
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}
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}
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