Rework validator callbacks to a listener service.

src/Listener/Dca/Validator.php

@@ -0,0 +1,122 @@
+<?php
+
+/**
+ * Leaflet maps for Contao CMS.
+ *
+ * @package    contao-leaflet-maps
+ * @author     David Molineus <david.molineus@netzmacht.de>
+ * @copyright  2016-2017 netzmacht David Molineus. All rights reserved.
+ * @license    LGPL-3.0 https://github.com/netzmacht/contao-leaflet-maps/blob/master/LICENSE
+ * @filesource
+ */
+
+namespace Netzmacht\Contao\Leaflet\Listener\Dca;
+
+use Netzmacht\LeafletPHP\Value\LatLng;
+use Symfony\Component\Translation\TranslatorInterface as Translator;
+
+/**
+ * Class Validator.
+ *
+ * @package Netzmacht\Contao\Leaflet\Dca
+ */
+class Validator
+{
+    /**
+     * Translator.
+     *
+     * @var Translator;
+     */
+    private $translator;
+
+    /**
+     * Validator constructor.
+     *
+     * @param Translator $translator Translator.
+     */
+    public function __construct(Translator $translator)
+    {
+        $this->translator = $translator;
+    }
+
+    /**
+     * Validate coordinates.
+     *
+     * @param mixed $value Given value.
+     *
+     * @return mixed
+     * @throws \InvalidArgumentException When invalid coordinates give.
+     */
+    public function validateCoordinates($value)
+    {
+        try {
+            LatLng::fromString($value);
+        } catch (\Exception $e) {
+            throw new \InvalidArgumentException(
+                $this->translator->trans('invalidCoordinates', [$value], 'contao_leaflet'),
+                0,
+                $e
+            );
+        }
+
+        return $value;
+    }
+
+    /**
+     * Validate multiple coordinates.
+     *
+     * @param mixed $values Given value.
+     *
+     * @return mixed
+     */
+    public function validateMultipleCoordinates($values)
+    {
+        if (!is_array($values)) {
+            $lines = explode("\n", $values);
+        } else {
+            $lines = $values;
+        }
+
+        foreach ($lines as $coordinate) {
+            $this->validateCoordinates($coordinate);
+        }
+
+        return $values;
+    }
+
+    /**
+     * Validate multiple coordinate sets.
+     *
+     * @param mixed $values Given value.
+     *
+     * @return mixed
+     */
+    public function validateMultipleCoordinateSets($values)
+    {
+        $sets = deserialize($values, true);
+        foreach ($sets as $lines) {
+            $this->validateMultipleCoordinates($lines);
+        }
+
+        return $values;
+    }
+
+    /**
+     * Validate an alias.
+     *
+     * @param string $value Given value.
+     *
+     * @return string
+     * @throws \InvalidArgumentException When invalid value given.
+     */
+    public function validateAlias($value)
+    {
+        if (preg_match('/^[A-Za-z_]+[A-Za-z0-9_]+$/', $value) !== 1) {
+            throw new \InvalidArgumentException(
+                $this->translator->trans('invalidAlias', [], 'contao_leaflet')
+            );
+        }
+
+        return $value;
+    }
+}