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691bc1c3fa
Also improve CAPTCHA portability into other parrts of the software by removing weird CAPTCHA-specific config file
37 lines
1.0 KiB
PHP
37 lines
1.0 KiB
PHP
<?php
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require_once 'cool-php-captcha-0.3.1/captcha.php';
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function generate_captcha($extra = '1234567890') {
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global $config;
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$text = rand_string($config['captcha']['length'], $extra);
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$captcha = new SimpleCaptcha();
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$cookie = rand_string(20, "abcdefghijklmnopqrstuvwxyz");
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ob_start();
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$captcha->CreateImage($text);
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$image = ob_get_contents();
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ob_end_clean();
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$html = '<image src="data:image/png;base64,'.base64_encode($image).'">';
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$query = prepare("INSERT INTO `captchas` (`cookie`, `extra`, `text`, `created_at`) VALUES (?, ?, ?, ?)");
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$query->execute( [$cookie, $extra, $text, time()]);
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return array("cookie" => $cookie, "html" => $html);
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}
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function rand_string($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 () {
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global $config;
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prepare("DELETE FROM `captchas` WHERE `created_at` < ?")->execute([time() - $config['captcha']['expires_in']]);
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}
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