From 609c5e9da9bb52c317eea1abbd424cca181caad9 Mon Sep 17 00:00:00 2001
From: thomascube <thomas@roundcube.net>
Date: Mon, 11 Jul 2011 06:51:42 -0400
Subject: [PATCH] Session object can be null if db/memcache is not available

---
 program/include/rcmail.php |   64 ++++++++++++++++++++-----------
 1 files changed, 41 insertions(+), 23 deletions(-)

diff --git a/program/include/rcmail.php b/program/include/rcmail.php
index e93d546..72f0efa 100644
--- a/program/include/rcmail.php
+++ b/program/include/rcmail.php
@@ -124,6 +124,7 @@
   private $address_books = array();
   private $caches = array();
   private $action_map = array();
+  private $shutdown_functions = array();
 
 
   /**
@@ -381,18 +382,12 @@
    */
   public function get_address_book($id, $writeable = false)
   {
-    $contacts = null;
+    $contacts    = null;
     $ldap_config = (array)$this->config->get('ldap_public');
-    $abook_type = strtolower($this->config->get('address_book_type'));
+    $abook_type  = strtolower($this->config->get('address_book_type'));
 
-    $plugin = $this->plugins->exec_hook('addressbook_get', array('id' => $id, 'writeable' => $writeable));
-
-    // plugin returned instance of a rcube_addressbook
-    if ($plugin['instance'] instanceof rcube_addressbook) {
-      $contacts = $plugin['instance'];
-    }
     // use existing instance
-    else if (isset($this->address_books[$id]) && is_a($this->address_books[$id], 'rcube_addressbook') && (!$writeable || !$this->address_books[$id]->readonly)) {
+    if (isset($this->address_books[$id]) && is_a($this->address_books[$id], 'rcube_addressbook') && (!$writeable || !$this->address_books[$id]->readonly)) {
       $contacts = $this->address_books[$id];
     }
     else if ($id && $ldap_config[$id]) {
@@ -401,17 +396,25 @@
     else if ($id === '0') {
       $contacts = new rcube_contacts($this->db, $this->user->ID);
     }
-    else if ($abook_type == 'ldap') {
-      // Use the first writable LDAP address book.
-      foreach ($ldap_config as $id => $prop) {
-        if (!$writeable || $prop['writable']) {
-          $contacts = new rcube_ldap($prop, $this->config->get('ldap_debug'), $this->config->mail_domain($_SESSION['imap_host']));
-          break;
+    else {
+      $plugin = $this->plugins->exec_hook('addressbook_get', array('id' => $id, 'writeable' => $writeable));
+
+      // plugin returned instance of a rcube_addressbook
+      if ($plugin['instance'] instanceof rcube_addressbook) {
+        $contacts = $plugin['instance'];
+      }
+      else if ($abook_type == 'ldap') {
+        // Use the first writable LDAP address book.
+        foreach ($ldap_config as $id => $prop) {
+          if (!$writeable || $prop['writable']) {
+            $contacts = new rcube_ldap($prop, $this->config->get('ldap_debug'), $this->config->mail_domain($_SESSION['imap_host']));
+            break;
+          }
         }
       }
-    }
-    else { // $id == 'sql'
-      $contacts = new rcube_contacts($this->db, $this->user->ID);
+      else { // $id == 'sql'
+        $contacts = new rcube_contacts($this->db, $this->user->ID);
+      }
     }
 
     // add to the 'books' array for shutdown function
@@ -505,7 +508,7 @@
     $this->output->set_env('comm_path', $this->comm_path);
     $this->output->set_charset(RCMAIL_CHARSET);
 
-    // add some basic label to client
+    // add some basic labels to client
     $this->output->add_label('loading', 'servererror');
 
     return $this->output;
@@ -1140,6 +1143,9 @@
    */
   public function shutdown()
   {
+    foreach ($this->shutdown_functions as $function)
+      call_user_func($function);
+
     if (is_object($this->smtp))
       $this->smtp->disconnect();
 
@@ -1159,7 +1165,7 @@
       $this->imap->close();
 
     // before closing the database connection, write session data
-    if ($_SERVER['REMOTE_ADDR']) {
+    if ($_SERVER['REMOTE_ADDR'] && is_object($this->session)) {
       $this->session->cleanup();
       session_write_close();
     }
@@ -1177,6 +1183,19 @@
       else
         console($log);
     }
+  }
+
+
+  /**
+   * Registers shutdown function to be executed on shutdown.
+   * The functions will be executed before destroying any
+   * objects like smtp, imap, session, etc.
+   *
+   * @param callback Function callback
+   */
+  public function add_shutdown_function($function)
+  {
+    $this->shutdown_functions[] = $function;
   }
 
 
@@ -1371,9 +1390,8 @@
 
     $url = './';
     $delm = '?';
-    foreach (array_reverse($p) as $key => $val)
-    {
-      if (!empty($val)) {
+    foreach (array_reverse($p) as $key => $val) {
+      if ($val !== '') {
         $par = $key[0] == '_' ? $key : '_'.$key;
         $url .= $delm.urlencode($par).'='.urlencode($val);
         $delm = '&';

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