forked from lolcat/4get
326 lines
6.8 KiB
PHP
326 lines
6.8 KiB
PHP
<?php
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class captcha{
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public function __construct($frontend, $get, $filters, $page, $output){
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/*
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Validate cookie, if it exists
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*/
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if(isset($_COOKIE["pass"])){
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if(
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// check if key is not malformed
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preg_match(
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'/^c[0-9]+\.[A-Za-z0-9]{20}$/',
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$_COOKIE["pass"]
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) &&
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// does key exist
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apcu_exists($_COOKIE["pass"])
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){
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// exists, increment counter
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$inc = apcu_inc($_COOKIE["pass"]);
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// we start counting from 1
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// when it has been incremented to 102, it has reached
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// 100 reqs
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if($inc >= 102){
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// reached limit, delete and give captcha
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apcu_delete($_COOKIE["pass"]);
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}else{
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// the cookie is OK! dont die() and give results
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if($output === true){
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$frontend->loadheader(
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$get,
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$filters,
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$page
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);
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}
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return;
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}
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}
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}
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if($output === false){
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echo json_encode([
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"status" => "The \"pass\" token in your cookies is missing or has expired!!"
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]);
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die();
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}
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/*
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Validate form data
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*/
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$lines =
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explode(
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"\r\n",
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file_get_contents("php://input")
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);
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$invalid = false;
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$answers = [];
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$key = false;
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$error = "";
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foreach($lines as $line){
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$line = explode("=", $line, 2);
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if(count($line) !== 2){
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$invalid = true;
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break;
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}
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preg_match(
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'/^c\[([0-9]+)\]$/',
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$line[0],
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$regex
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);
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if(
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$line[1] != "on" ||
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!isset($regex[0][1])
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){
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// check if its k
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if(
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$line[0] == "k" &&
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strpos($line[1], "c.") === 0
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){
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$key = apcu_fetch($line[1]);
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apcu_delete($line[1]);
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}
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break;
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}
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$regex = (int)$regex[1];
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if(
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$regex >= 16 ||
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$regex <= -1
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){
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$invalid = true;
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break;
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}
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$answers[] = $regex;
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}
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if(
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!$invalid &&
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$key !== false
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){
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$check = $key[1];
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// validate answer
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for($i=0; $i<count($key[0]); $i++){
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if(!in_array($i, $answers)){
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continue;
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}
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if($key[0][$i][0] == $key[2]){
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$check--;
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}else{
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// got a wrong answer
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$check = -1;
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break;
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}
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}
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if($check === 0){
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// we passed the captcha
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// set cookie
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$inc = apcu_inc("cookie");
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$chars =
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array_merge(
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range("A", "Z"),
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range("a", "z"),
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range(0, 9)
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);
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$c = count($chars) - 1;
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$key = "c" . $inc . ".";
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for($i=0; $i<20; $i++){
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$key .= $chars[random_int(0, $c)];
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}
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apcu_inc($key, 1, $stupid, 86400);
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setcookie(
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"pass",
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$key,
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[
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"expires" => time() + 86400, // expires in 24 hours
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"samesite" => "Lax",
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"path" => "/"
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]
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);
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$frontend->loadheader(
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$get,
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$filters,
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$page
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);
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return;
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}else{
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$error = "<div class=\"quote\">You were <a href=\"https://www.youtube.com/watch?v=e1d7fkQx2rk\" target=\"_BLANK\" rel=\"noreferrer nofollow\">kicked out of Mensa.</a> Please try again.</div>";
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}
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}
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/*
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Generate random grid data to pass to captcha.php
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*/
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$dataset = [
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["birds", 2263],
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["fumo_plushies", 1006],
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["minecraft", 848]
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];
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// get the positions for the answers
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// will return between 3 and 6 answer positions
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$range = range(0, 15);
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$answer_pos = [];
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array_splice($range, 0, 1);
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for($i=0; $i<random_int(3, 6); $i++){
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$answer_pos_tmp =
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array_splice(
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$range,
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random_int(
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0,
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14 - $i
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),
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1
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);
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$answer_pos[] = $answer_pos_tmp[0];
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}
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// choose a dataset
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$choosen = &$dataset[random_int(0, count($dataset) - 1)];
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$choices = [];
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for($i=0; $i<count($dataset); $i++){
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if($dataset[$i][0] == $choosen[0]){
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continue;
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}
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$choices[] = $dataset[$i];
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}
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// generate grid data
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$grid = [];
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for($i=0; $i<16; $i++){
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if(in_array($i, $answer_pos)){
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$grid[] = $choosen;
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}else{
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$grid[] = $choices[random_int(0, count($choices) - 1)];
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}
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}
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$key = "c." . apcu_inc("captcha_gen", 1) . "." . random_int(0, 100000000);
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apcu_store(
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$key,
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[
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$grid,
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count($answer_pos),
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$choosen[0],
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false // has captcha been generated?
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],
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120 // we give user 2 minutes to get captcha, in case of network error
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);
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$payload = [
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"class" => "",
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"right-left" => "",
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"right-right" => "",
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"left" =>
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'<div class="infobox">' .
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'<h1>IQ test</h1>' .
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'Due to getting hit with 20,000 bot requests per day, I had to put this up. Sorry.<br><br>' .
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'Solving this captcha will allow you to make 100 searches today. I will add a way for legit users to bypass the captcha later. Sorry /g/tards!!' .
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$error .
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'<form method="POST" enctype="text/plain" autocomplete="off">' .
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'<div class="captcha-wrapper">' .
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'<div class="captcha">' .
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'<img src="captcha?k=' . $key . '" alt="Captcha image">' .
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'<div class="captcha-controls">' .
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'<input type="checkbox" name="c[0]" id="c0">' .
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'<label for="c0"></label>' .
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'<input type="checkbox" name="c[1]" id="c1">' .
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'<label for="c1"></label>' .
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'<input type="checkbox" name="c[2]" id="c2">' .
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'<label for="c2"></label>' .
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'<input type="checkbox" name="c[3]" id="c3">' .
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'<label for="c3"></label>' .
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'<input type="checkbox" name="c[4]" id="c4">' .
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'<label for="c4"></label>' .
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'<input type="checkbox" name="c[5]" id="c5">' .
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'<label for="c5"></label>' .
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'<input type="checkbox" name="c[6]" id="c6">' .
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'<label for="c6"></label>' .
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'<input type="checkbox" name="c[7]" id="c7">' .
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'<label for="c7"></label>' .
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'<input type="checkbox" name="c[8]" id="c8">' .
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'<label for="c8"></label>' .
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'<input type="checkbox" name="c[9]" id="c9">' .
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'<label for="c9"></label>' .
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'<input type="checkbox" name="c[10]" id="c10">' .
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'<label for="c10"></label>' .
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'<input type="checkbox" name="c[11]" id="c11">' .
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'<label for="c11"></label>' .
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'<input type="checkbox" name="c[12]" id="c12">' .
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'<label for="c12"></label>' .
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'<input type="checkbox" name="c[13]" id="c13">' .
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'<label for="c13"></label>' .
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'<input type="checkbox" name="c[14]" id="c14">' .
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'<label for="c14"></label>' .
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'<input type="checkbox" name="c[15]" id="c15">' .
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'<label for="c15"></label>' .
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'</div>' .
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'</div>' .
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'</div>' .
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'<input type="hidden" name="k" value="' . $key . '">' .
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'<input type="submit" value="Check IQ" class="captcha-submit">' .
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'</form>' .
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'</div>'
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];
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http_response_code(429); // too many reqs
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$frontend->loadheader(
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$get,
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$filters,
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$page
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);
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echo $frontend->load("search.html", $payload);
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die();
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}
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}
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