Introduce DataUtilityServiceProvider

- Lack of a better name…
- Shares a method to validate a string against our password policy
- Shares a method to transform a given string to the (likely) group
mailbox name

app/sog/Dashboard/DataUtilityServiceProvider.php

@@ -0,0 +1,69 @@
+<?php
+namespace SOG\Dashboard;
+
+
+use Silex\Application;
+use Silex\ServiceProviderInterface;
+
+/**
+ * Class DataUtilityServiceProvider
+ * @package SOG\Dashboard
+ */
+class DataUtilityServiceProvider implements ServiceProviderInterface
+{
+
+    /**
+     * Check if the given password complies with our password policy.
+     *
+     * @param string $password
+     * @param int $minLength The minimum length for the password
+     * @param string $regex The regex for checking the password character classes
+     * @return bool True if the given password complies with the password policy, false otherwise.
+     */
+    private static function checkPasswordPolicy($password, $minLength = 8, $regex = '/[A-Za-z].*[0-9]|[0-9].*[A-Za-z]/')
+    {
+        if (strlen($password) < $minLength) {
+            return false;
+        }
+        if (preg_match($regex, $password) === 0) {
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Replaces certain prefixes of an OU to retrieve the mailbox name.
+     *
+     * @param string $ou
+     * @return string The modified string
+     */
+    private static function getMailFromOu($ou)
+    {
+        $ou = strtolower($ou);
+        $prefixes = [
+            'ak_', 'lg_', 'ressort_'
+        ];
+        return str_replace($prefixes, '', $ou);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function register(Application $app)
+    {
+        $app['check_password_policy'] = $app->protect(function () {
+            return call_user_func_array('self::checkPasswordPolicy', func_get_args());
+        });
+        $app['get_mail_from_ou'] = $app->protect(function () {
+            return call_user_func_array('self::getMailFromOu', func_get_args());
+        });
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function boot(Application $app)
+    {
+        // nothing to do here
+    }
+}