diff --git a/maintain.inc.php b/maintain.inc.php
new file mode 100644
index 0000000..ff5015b
--- /dev/null
+++ b/maintain.inc.php
@@ -0,0 +1,75 @@
+<?php
+defined('PHPWG_ROOT_PATH') or die('Hacking attempt!');
+
+include_once('class.ldap.php');
+
+/**
+ * This class is used to expose maintenance methods to the plugins manager
+ * It must extends PluginMaintain and be named "PLUGINID_maintain"
+ * where PLUGINID is the directory name of your plugin
+ */
+class Ldap_Login_maintain extends PluginMaintain
+{
+  /*
+   * My pattern uses a single installation method, which handles both installation
+   * and activation, where Piwigo always calls 'activate' just after 'install'
+   * As a result I use a marker in order to not execute the installation method twice
+   *
+   * The installation function is called by main.inc.php and maintain.inc.php
+   * in order to install and/or update the plugin.
+   *
+   * That's why all operations must be conditionned :
+   *    - use "if empty" for configuration vars
+   *    - use "IF NOT EXISTS" for table creation
+   */
+  private $installed = false;
+  
+  /**
+   * plugin installation
+   *
+   * perform here all needed step for the plugin installation
+   * such as create default config, add database tables,
+   * add fields to existing tables, create local folders...
+   */
+  function install($plugin_version, &$errors=array())
+  {
+    global $conf;
+    $config=new Ldap();
+    
+    if (file_exists(LDAP_LOGIN_PATH.'data.dat' )) {
+    $config->load_config();
+    }
+    
+    else {
+    $config->load_default_config();
+    }
+
+    $config->save_config();
+
+    $this->installed = true;
+  }
+
+  /**
+   * plugin activation
+   *
+   * this function is triggered after installation, by manual activation
+   * or after a plugin update
+   * for this last case you must manage updates tasks of your plugin in this function
+   */
+  function activate($plugin_version, &$errors=array())
+  {
+    if (!$this->installed)
+    {
+      $this->install($plugin_version, $errors);
+    }
+  }
+  
+  function deactivate()
+  {
+  }
+
+  function uninstall()
+  {
+  }
+
+}
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