123 lines
3.7 KiB
PHP
123 lines
3.7 KiB
PHP
<?php
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namespace Grav\Plugin\Form;
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use GdImage;
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use Grav\Common\Grav;
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class BasicCaptcha
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{
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protected $session = null;
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protected $key = 'basic_captcha_code';
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public function __construct()
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{
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$this->session = Grav::instance()['session'];
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}
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public function getCaptchaCode($length = null): string
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{
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$config = Grav::instance()['config']->get('plugins.form.basic_captcha');
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$type = $config['type'] ?? 'characters';
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if ($type == 'math') {
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$min = $config['math']['min'] ?? 1;
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$max = $config['math']['max'] ?? 12;
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$operators = $config['math']['operators'] ?? ['+','-','*'];
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$first_num = random_int($min, $max);
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$second_num = random_int($min, $max);
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$operator = $operators[array_rand($operators)];
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// calculator
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if ($operator === '-') {
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if ($first_num < $second_num) {
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$result = "$second_num - $first_num";
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$captcha_code = $second_num - $first_num;
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} else {
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$result = "$first_num-$second_num";
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$captcha_code = $first_num - $second_num;
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}
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} elseif ($operator === '*') {
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$result = "{$first_num} x {$second_num}";
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$captcha_code = $first_num * $second_num;
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} elseif ($operator === '/') {
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$result = "$first_num / second_num";
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$captcha_code = $first_num / $second_num;
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} elseif ($operator === '+') {
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$result = "$first_num + $second_num";
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$captcha_code = $first_num + $second_num;
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}
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} else {
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if ($length === null) {
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$length = $config['chars']['length'] ?? 6;
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}
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$random_alpha = md5(random_bytes(64));
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$captcha_code = substr($random_alpha, 0, $length);
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$result = $captcha_code;
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}
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$this->setSession($this->key, $captcha_code);
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return $result;
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}
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public function setSession($key, $value): void
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{
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$this->session->$key = $value;
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}
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public function getSession($key = null): ?string
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{
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if ($key === null) {
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$key = $this->key;
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}
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return $this->session->$key ?? null;
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}
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public function createCaptchaImage($captcha_code)
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{
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$config = Grav::instance()['config']->get('plugins.form.basic_captcha');
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$font = $config['chars']['font'] ?? 'zxx-xed.ttf';
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$target_layer = imagecreatetruecolor($config['chars']['box_width'], $config['chars']['box_height']);
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$bg = $this->hexToRgb($config['chars']['bg'] ?? '#ffffff');
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$text = $this->hexToRgb($config['chars']['text'] ?? '#000000');
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$captcha_background = imagecolorallocate($target_layer, $bg[0], $bg[1], $bg[2]);
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$captcha_text_color = imagecolorallocate($target_layer, $text[0], $text[1], $text[2]);
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$font_path = __DIR__ . '/../fonts/' . $font;
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imagefill($target_layer, 0, 0, $captcha_background);
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imagefttext($target_layer, $config['chars']['size'], 0, $config['chars']['start_x'], $config['chars']['start_y'], $captcha_text_color, $font_path, $captcha_code);
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return $target_layer;
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}
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public function renderCaptchaImage($imageData): void
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{
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header("Content-type: image/jpeg");
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imagejpeg($imageData);
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}
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public function validateCaptcha($formData): bool
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{
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$isValid = false;
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$capchaSessionData = $this->getSession();
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if ($capchaSessionData == $formData) {
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$isValid = true;
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}
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return $isValid;
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}
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private function hexToRgb($hex): array
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{
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return sscanf($hex, "#%02x%02x%02x");
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}
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}
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