validate color (#2072)

src/Validator/Constraints/HexColor.php

@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Validator\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * @Annotation
+ * @Target({"PROPERTY", "METHOD", "ANNOTATION"})
+ */
+class HexColor extends Constraint
+{
+    public const HEX_COLOR_ERROR = 'xd5hffg-dsfef3-426a-83d7-2g8jkfr56d84';
+
+    protected static $errorNames = [
+        self::HEX_COLOR_ERROR => 'HEX_COLOR_ERROR',
+    ];
+
+    public $message = 'The given value is not a valid hexadecimal color.';
+}

src/Validator/Constraints/HexColorValidator.php

@@ -0,0 +1,40 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Validator\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+
+class HexColorValidator extends ConstraintValidator
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function validate($value, Constraint $constraint)
+    {
+        if (!$constraint instanceof HexColor) {
+            throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\HexColor');
+        }
+
+        $color = $value;
+
+        if ($color === null || (\is_string($color) && empty($color))) {
+            return;
+        }
+
+        if (!\is_string($color) || 1 !== preg_match('/^#([0-9a-fA-F]{6}|[0-9a-fA-F]{3})$/i', $color)) {
+            $this->context->buildViolation($constraint->message)
+                ->setParameter('{{ value }}', $this->formatValue($color))
+                ->setCode(HexColor::HEX_COLOR_ERROR)
+                ->addViolation();
+        }
+    }
+}