122 lines
3.8 KiB
PHP
122 lines
3.8 KiB
PHP
<?php declare(strict_types=1);
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namespace commitcaptcha;
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use Nette\Utils\Image;
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use Chandler\Session\Session;
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use Chandler\Patterns\TSimpleSingleton;
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class CaptchaManager
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{
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private $session;
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private function __construct()
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{
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$this->session = Session::i();
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}
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private function generateColor(bool $maxOutRed = false): array
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{
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return [
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"red" => $maxOutRed ? 255 : random_int(0, 150),
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"green" => random_int(0, 100),
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"blue" => random_int(0, 150),
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"alpha" => 0,
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];
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}
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private function generateCode(): string
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{
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return mb_strtoupper(str_replace("/", "+", base64_encode(openssl_random_pseudo_bytes(6))));
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}
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private function applyNoiseOnImage(Image $image, \Closure $fun): void
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{
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$_noise = (function() use ($image) {
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foreach(range(1, 33) as $x)
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foreach(range(1, 13) as $y)
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$image->setPixel($x * 5, $y * 5, $this->generateColor());
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});
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$_noise();
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$fun();
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$_noise();
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}
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private function applyLinesOnImage(Image $image, \Closure $fun): void
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{
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$_lines = (function() use ($image) {
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foreach(range(1, random_int(2, 6)) as $i)
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$image->line(random_int(0, 15), random_int(0, 65), random_int(150, 165), random_int(0, 65), $this->generateColor());
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});
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$_lines();
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$fun();
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$_lines();
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}
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private function generateCaptchaImage(string $code): Image
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{
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$image = Image::fromBlank(165, 65, $this->generateColor());
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$this->applyNoiseOnImage($image, function() use ($image, $code) {
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$this->applyLinesOnImage($image, function() use ($image, $code) {
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$length = iconv_strlen($code);
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$offset = 165 / $length;
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for($i = 0; $i < $length; $i++) {
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$letter = $code[$i];
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$font = __DIR__ . "/data/san-francissco.ttf";
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$x = (int) ceil(0 + ($offset * $i));
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$y = random_int(45, 55);
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$image->ttfText(random_int(18, 28), random_int(-10, 10), $x, $y, $this->generateColor(true), $font, $letter);
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}
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});
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});
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return $image;
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}
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function getImage(): Image
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{
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$code = $this->generateCode();
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$hash = hash("crc32b", mb_strtolower($code));
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$image = $this->generateCaptchaImage($code);
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$nonce = bin2hex(openssl_random_pseudo_bytes(SODIUM_CRYPTO_STREAM_NONCEBYTES / 2));
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$key = substr(CHANDLER_ROOT_CONF["security"]["secret"], 0, SODIUM_CRYPTO_STREAM_KEYBYTES);
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$encHash = sodium_crypto_stream_xor($hash, $nonce, $key);
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$this->session->set("captcha", implode(":", [
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time(),
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$nonce,
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base64_encode($encHash),
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]));
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return $image;
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}
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function verifyCaptcha(?string $input = NULL): bool
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{
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if(!COMMITCAPTCHA_ROOT_CONF["commitcaptcha"]["enable"])
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return true;
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if(!$input)
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$input = $_POST["captcha"];
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$data = $this->session->get("captcha");
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if(!$data)
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return false;
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$this->session->set("captcha", "");
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[$time, $nonce, $encHash] = explode(":", $data);
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if((time() - $time) > 3600)
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return false;
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$key = substr(CHANDLER_ROOT_CONF["security"]["secret"], 0, SODIUM_CRYPTO_STREAM_KEYBYTES);
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$hash = sodium_crypto_stream_xor(base64_decode($encHash), $nonce, $key);
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return hash_equals(hash("crc32b", mb_strtolower($input)), $hash);
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}
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use TSimpleSingleton;
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}
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