Initial commit of Session/Authentication code

Plugin architecture with single Database-backed implementation.

source/lib/SihnonFramework/Auth/Plugin/Database/User.class.php

@@ -0,0 +1,74 @@
+<?php
+
+class SihnonFramework_Auth_Plugin_Database_User extends Sihnon_DatabaseObject implements Sihnon_Auth_IUser {
+    
+    protected static $table = 'user';
+
+    protected $_db_id;
+    protected $_db_username;
+    protected $_db_password;
+    protected $_db_fullname;
+    protected $_db_email;
+    protected $_db_last_login;
+    protected $_db_last_password_change;
+    
+    protected $groups = null;
+    protected $permissions = null;
+    
+    public static function exists($username) {
+        return static::exists('username', $username);
+    }
+    
+    public static function add($username, $password) {
+        $user = new self();
+        $user->username = $username;
+        $user->password = sha1($password);
+        $user->last_password_change = time();
+        $user->create();
+        
+        return $user;
+    }
+    
+    public function username() {
+        return $this->username;
+    }
+    
+    public function checkPassword($password) {
+        return ($this->password == sha1($password));
+    }
+    
+    public function changePassword($new_password) {
+        $this->password = sha1($new_password);
+        $this->save();
+    }
+    
+    public function groups($ignore_cache = false) {
+        if ($this->groups === null || $ignore_cache) {
+            $this->groups = Sihnon_Auth_Plugin_Database_Group::all_for('user', $this->id, 'groups_by_user');
+        }
+        
+        return $this->groups;
+    }
+    
+    public function permissions($ignore_cache = false) {
+        if ($this->permissions === null || $ignore_cache) {
+            $this->permissions = Sihnon_Auth_Plugin_Database_Permission::all_for('user', $this->id, 'permissions_by_user');
+        }
+        
+        return $this->permissions;
+    }
+    
+    public function hasPermission($permission) {
+        $permissions = $this->permissions();
+        foreach ($permissions as $has_permission) {
+            if ($permission == $has_permission->id) {
+                return true;
+            }
+        }
+        
+        return false;
+    }
+    
+}
+
+?>