1 files changed, 72 insertions, 0 deletions
diff --git a/library/Icinga/Web/Form/Validator/WritablePathValidator.php b/library/Icinga/Web/Form/Validator/WritablePathValidator.php
new file mode 100644
index 0000000..76efb58
--- /dev/null
+++ b/library/Icinga/Web/Form/Validator/WritablePathValidator.php
@@ -0,0 +1,72 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Validator;
+
+use Zend_Validate_Abstract;
+
+/**
+ * Validator that interprets the value as a path and checks if it's writable
+ */
+class WritablePathValidator extends Zend_Validate_Abstract
+{
+    const NOT_WRITABLE = 'notWritable';
+    const DOES_NOT_EXIST = 'doesNotExist';
+
+    /**
+     * The messages to write on differen error states
+     *
+     * @var array
+     *
+     * @see Zend_Validate_Abstract::$_messageTemplates‚
+     */
+    protected $_messageTemplates = array(
+        self::NOT_WRITABLE      => 'Path is not writable',
+        self::DOES_NOT_EXIST    => 'Path does not exist'
+    );
+
+    /**
+     * When true, the file or directory must exist
+     *
+     * @var bool
+     */
+    private $requireExistence = false;
+
+    /**
+     * Set this validator to require the target file to exist
+     */
+    public function setRequireExistence()
+    {
+        $this->requireExistence = true;
+    }
+
+    /**
+     * Check whether the given value is writable path
+     *
+     * @param   string  $value      The value submitted in the form
+     * @param   mixed   $context    The context of the form
+     *
+     * @return  bool True when validation worked, otherwise false
+     *
+     * @see     Zend_Validate_Abstract::isValid()
+     */
+    public function isValid($value, $context = null)
+    {
+        $value = (string) $value;
+
+        $this->_setValue($value);
+        if ($this->requireExistence && !file_exists($value)) {
+            $this->_error(self::DOES_NOT_EXIST);
+            return false;
+        }
+
+        if ((file_exists($value) && is_writable($value)) ||
+            (is_dir(dirname($value)) && is_writable(dirname($value)))
+        ) {
+            return true;
+        }
+
+        $this->_error(self::NOT_WRITABLE);
+        return false;
+    }
+}