Initial commit of Session/Authentication code

Plugin architecture with single Database-backed implementation.

source/lib/SihnonFramework/Auth/PluginFactory.class.php

@@ -0,0 +1,30 @@
+<?php
+
+class SihnonFramework_Auth_PluginFactory extends Sihnon_PluginFactory {
+    
+    protected static $plugin_prefix    = 'Sihnon_Auth_Plugin_';
+    protected static $plugin_interface = 'SihnonFramework_Auth_IPlugin';
+    protected static $plugin_dir       = array(
+    	SihnonFramework_Lib => 'SihnonFramework/Auth/Plugin/',
+    	Sihnon_Lib          => 'Sihnon/Auth/Plugin/',
+	);
+    
+    public static function init() {
+        
+    }
+    
+    public static function create(SihnonFramework_Config $config, $plugin) {
+        self::ensureScanned();
+        
+        if (! self::isValidPlugin($plugin)) {
+            throw new Sihnon_Exception_InvalidPluginName($plugin);
+        }
+        
+        $classname = self::classname($plugin);
+        
+        return call_user_func(array($classname, 'create'), $config);
+    }
+    
+}
+
+?>