feat(altcha): add altcha validation layer to login

src/Altcha/AltchaTransformer.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace App\Altcha;
+
+use App\Altcha\Form\AltchaModel;
+use Symfony\Component\Form\DataTransformerInterface;
+
+class AltchaTransformer implements DataTransformerInterface
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function reverseTransform($value): AltchaModel
+    {
+        if (empty($value)) {
+            return new AltchaModel();
+        }
+
+        $decodedValue = base64_decode($value);
+        $data = json_decode($decodedValue);
+
+        $model = new AltchaModel();
+
+        foreach ($data as $property => $value) {
+            $model->{$property} = $value;
+        }
+
+        return $model;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function transform($value): string
+    {
+        if (empty($value)) {
+            return '';
+        }
+
+        $json = json_encode($value);
+
+        if (false === $json) {
+            return '';
+        }
+
+        return base64_encode($json);
+    }
+}