Move task link validator methods

app/Validator/TaskLinkValidator.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Kanboard\Validator;
+
+use SimpleValidator\Validator;
+use SimpleValidator\Validators;
+use Kanboard\Model\Task;
+
+/**
+ * TaskLink Validator
+ *
+ * @package  validator
+ * @author   Frederic Guillot
+ */
+class TaskLinkValidator extends Base
+{
+    /**
+     * Common validation rules
+     *
+     * @access private
+     * @return array
+     */
+    private function commonValidationRules()
+    {
+        return array(
+            new Validators\Required('task_id', t('Field required')),
+            new Validators\Required('opposite_task_id', t('Field required')),
+            new Validators\Required('link_id', t('Field required')),
+            new Validators\NotEquals('opposite_task_id', 'task_id', t('A task cannot be linked to itself')),
+            new Validators\Exists('opposite_task_id', t('This linked task id doesn\'t exists'), $this->db->getConnection(), Task::TABLE, 'id')
+        );
+    }
+
+    /**
+     * Validate creation
+     *
+     * @access public
+     * @param  array   $values           Form values
+     * @return array   $valid, $errors   [0] = Success or not, [1] = List of errors
+     */
+    public function validateCreation(array $values)
+    {
+        $v = new Validator($values, $this->commonValidationRules());
+
+        return array(
+            $v->execute(),
+            $v->getErrors()
+        );
+    }
+
+    /**
+     * Validate modification
+     *
+     * @access public
+     * @param  array   $values           Form values
+     * @return array   $valid, $errors   [0] = Success or not, [1] = List of errors
+     */
+    public function validateModification(array $values)
+    {
+        $rules = array(
+            new Validators\Required('id', t('Field required')),
+        );
+
+        $v = new Validator($values, array_merge($rules, $this->commonValidationRules()));
+
+        return array(
+            $v->execute(),
+            $v->getErrors()
+        );
+    }
+}