lib: Add DbUserGroupBackend

library/Icinga/Authentication/Backend/DbUserGroupBackend.php

@@ -0,0 +1,63 @@
+<?php
+// {{{ICINGA_LICENSE_HEADER}}}
+// {{{ICINGA_LICENSE_HEADER}}}
+
+namespace Icinga\Authentication\Backend;
+
+use Icinga\Authentication\UserGroupBackend;
+use Icinga\Data\Db\DbConnection;
+use Icinga\User;
+
+/**
+ * Database user group backend
+ */
+class DbUserGroupBackend extends UserGroupBackend
+{
+    /**
+     * Connection to the database
+     *
+     * @var DbConnection
+     */
+    private $conn;
+
+    /**
+     * Create a new database user group backend
+     *
+     * @param DbConnection $conn
+     */
+    public function __construct(DbConnection $conn)
+    {
+        $this->conn = $conn;
+    }
+
+    /**
+     * (non-PHPDoc)
+     * @see UserGroupBackend::getMemberships() For the method documentation.
+     */
+    public function getMemberships(User $user)
+    {
+        $groups = array();
+        $groupsStmt = $this->conn->getDbAdapter()
+            ->select()
+            ->from($this->conn->getTablePrefix() . 'group', array('name', 'parent'))
+            ->query();
+        foreach ($groupsStmt as $group) {
+            $groups[$group->name] = $group->parent;
+        }
+        $memberships = array();
+        $membershipsStmt = $this->conn->getDbAdapter()
+            ->select()
+            ->from($this->conn->getTablePrefix() . 'group_membership', array('group_name'))
+            ->where('username = ?', $user->getUsername())
+            ->query();
+        foreach ($membershipsStmt as $membership) {
+            $memberships[] = $membership->group_name;
+            $parent = $groups[$membership->group_name];
+            while (isset($parent)) {
+                $memberships[] = $parent;
+                $parent = $groups[$parent];
+            }
+        }
+        return $memberships;
+    }
+}