1 files changed, 39 insertions, 0 deletions
diff --git a/cgi/captcha.php b/cgi/captcha.php
new file mode 100755
index 0000000..6881063
--- /dev/null
+++ b/cgi/captcha.php
@@ -0,0 +1,39 @@
+<?php
+
+use Gregwar\Captcha\CaptchaBuilder;
+
+const CAPTCHA_PHRASE_LENGTH = 7;
+
+require_once __DIR__ . "/../vendor/autoload.php";
+
+session_start();
+
+$mode = $_GET["m"] ?? "newcaptcha";
+
+if ($mode === "newcaptcha") {
+    header("Pragma: no-cache");
+    header("Cache-Control: no-cache");
+    header("Location: ?m=captcha&r=" . urldecode(bin2hex(random_bytes(10))));
+    exit;
+}
+
+$charset = 'ABCDEFGHKLMNPQRTWXYZ234789abdefghkmnpqr';
+$phrase = "";
+for ($i = 0; $i < CAPTCHA_PHRASE_LENGTH; ++$i)
+    $phrase .= $charset[random_int(0, strlen($charset) - 1)];
+
+$builder = new CaptchaBuilder($phrase);
+$builder->setInterpolation(false);
+$builder->build(256, 64);
+$_SESSION["captcha_phrase"] = $builder->getPhrase();
+
+if ($mode === "captcha") {
+    echo '<body background="?m=captchaimg&r=' . bin2hex(random_bytes(10)) . '">';
+    exit;
+}
+
+if ($mode === "captchaimg") {
+    header("Content-Type: image/jpeg");
+    $builder->save(null, 40);
+    exit;
+}