86 lines
2.0 KiB
PHP
86 lines
2.0 KiB
PHP
<?php
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$mode = @$_GET['mode'];
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require_once("captcha.php");
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function rand_string($length, $charset) {
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$ret = "";
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while ($length--) {
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$ret .= mb_substr($charset, rand(0, mb_strlen($charset, 'utf-8')-1), 1, 'utf-8');
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}
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return $ret;
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}
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function cleanup ($pdo, $expires_in) {
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$pdo->prepare("DELETE FROM `captchas` WHERE `created_at` < ?")->execute([time() - $expires_in]);
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}
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switch ($mode) {
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// Request: GET entrypoint.php?mode=get&extra=1234567890
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// Response: JSON: cookie => "generatedcookie", captchahtml => "captchahtml", expires_in => 120
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case "get":
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if (!isset ($_GET['extra'])) {
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die();
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}
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header("Content-type: application/json");
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$extra = $_GET['extra'];
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require_once("config.php");
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$text = rand_string($length, $extra);
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$captcha = new CzaksCaptcha($text, $width, $height, $extra);
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$cookie = rand_string(20, "abcdefghijklmnopqrstuvwxyz");
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ob_start();
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$captcha->to_html();
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$html = ob_get_contents();
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ob_end_clean();
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$query = $pdo->prepare("INSERT INTO `captchas` (`cookie`, `extra`, `text`, `created_at`) VALUES (?, ?, ?, ?)");
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$query->execute( [$cookie, $extra, $text, time()]);
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echo json_encode(["cookie" => $cookie, "captchahtml" => $html, "expires_in" => $expires_in]);
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break;
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// Request: GET entrypoint.php?mode=check&cookie=generatedcookie&extra=1234567890&text=captcha
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// Response: 0 OR 1
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case "check":
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if (!isset ($_GET['mode'])
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|| !isset ($_GET['cookie'])
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|| !isset ($_GET['extra'])
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|| !isset ($_GET['text'])) {
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die();
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}
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require_once("config.php");
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cleanup($pdo, $expires_in);
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$query = $pdo->prepare("SELECT * FROM `captchas` WHERE `cookie` = ? AND `extra` = ?");
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$query->execute([$_GET['cookie'], $_GET['extra']]);
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$ary = $query->fetchAll();
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if (!$ary) {
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echo "0";
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}
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else {
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$query = $pdo->prepare("DELETE FROM `captchas` WHERE `cookie` = ? AND `extra` = ?");
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$query->execute([$_GET['cookie'], $_GET['extra']]);
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if ($ary[0]['text'] !== $_GET['text']) {
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echo "0";
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}
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else {
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echo "1";
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}
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}
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break;
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}
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