Add class ReadablePathValidator

library/Icinga/Web/Form/Validator/ReadablePathValidator.php

@@ -0,0 +1,58 @@
+<?php
+// {{{ICINGA_LICENSE_HEADER}}}
+// {{{ICINGA_LICENSE_HEADER}}}
+
+namespace Icinga\Web\Form\Validator;
+
+use Zend_Validate_Abstract;
+
+/**
+ * Validator that interprets the value as a filepath and checks if it's readable
+ *
+ * This validator should be preferred due to Zend_Validate_File_Exists is
+ * getting confused if there is another element in the form called `name'.
+ */
+class ReadablePathValidator extends Zend_Validate_Abstract
+{
+    /**
+     * The messages to write on different error states
+     *
+     * @var array
+     *
+     * @see Zend_Validate_Abstract::$_messageTemplates‚
+     */
+    protected $_messageTemplates;
+
+    /**
+     * Initialize this validator
+     */
+    public function __construct()
+    {
+        $this->_messageTemplates = array(
+            'NOT_READABLE'      => t('Path is not readable'),
+            'DOES_NOT_EXIST'    => t('Path does not exist')
+        );
+    }
+
+    /**
+     * Check whether the given value is a readable filepath
+     *
+     * @param   string  $value      The value submitted in the form
+     * @param   mixed   $context    The context of the form
+     *
+     * @return  bool                Whether the value was successfully validated
+     */
+    public function isValid($value, $context = null)
+    {
+        if (false === file_exists($value)) {
+            $this->_error('DOES_NOT_EXIST');
+            return false;
+        }
+
+        if (false === is_readable($value)) {
+            $this->_error('NOT_READABLE');
+        }
+
+        return true;
+    }
+}