Copy plugins to release branch

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diff --git a/plugins/redundant_attachments/redundant_attachments.php b/plugins/redundant_attachments/redundant_attachments.php
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+++ b/plugins/redundant_attachments/redundant_attachments.php
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+<?php
+/**
+ * Redundant attachments
+ *
+ * This plugin provides a redundant storage for temporary uploaded
+ * attachment files. They are stored in both the database backend
+ * as well as on the local file system.
+ *
+ * It provides also memcache store as a fallback (see config file).
+ *
+ * This plugin relies on the core filesystem_attachments plugin
+ * and combines it with the functionality of the database_attachments plugin.
+ *
+ * @author Thomas Bruederli <roundcube@gmail.com>
+ * @author Aleksander Machniak <machniak@kolabsys.com>
+ *
+ * Copyright (C) 2011, The Roundcube Dev Team
+ * Copyright (C) 2011, Kolab Systems AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+require_once(INSTALL_PATH . 'plugins/filesystem_attachments/filesystem_attachments.php');
+
+class redundant_attachments extends filesystem_attachments
+{
+    // A prefix for the cache key used in the session and in the key field of the cache table
+    private $prefix = "ATTACH";
+
+    // rcube_cache instance for SQL DB
+    private $cache;
+
+    // rcube_cache instance for memcache
+    private $mem_cache;
+
+    private $loaded;
+
+    /**
+     * Default constructor
+     */
+    function init()
+    {
+        parent::init();
+    }
+
+    /**
+     * Loads plugin configuration and initializes cache object(s)
+     */
+    private function _load_drivers()
+    {
+        if ($this->loaded) {
+            return;
+        }
+
+        $rcmail = rcmail::get_instance();
+
+        // load configuration
+        $this->load_config();
+
+        // Init SQL cache (disable cache data serialization)
+        $this->cache = $rcmail->get_cache($this->prefix, 'db', 0, false);
+
+        // Init memcache (fallback) cache
+        if ($rcmail->config->get('redundant_attachments_memcache')) {
+            $ttl = 12 * 60 * 60; // 12 hours
+            $ttl = (int) $rcmail->config->get('redundant_attachments_memcache_ttl', $ttl);
+            $this->mem_cache = $rcmail->get_cache($this->prefix, 'memcache', $ttl, false);
+        }
+
+        $this->loaded = true;
+    }
+
+    /**
+     * Helper method to generate a unique key for the given attachment file
+     */
+    private function _key($args)
+    {
+        $uname = $args['path'] ? $args['path'] : $args['name'];
+        return $args['group'] . md5(mktime() . $uname . $_SESSION['user_id']);
+    }
+
+    /**
+     * Save a newly uploaded attachment
+     */
+    function upload($args)
+    {
+        $args = parent::upload($args);
+
+        $this->_load_drivers();
+
+        $key  = $this->_key($args);
+        $data = base64_encode(file_get_contents($args['path']));
+
+        $status = $this->cache->write($key, $data);
+
+        if (!$status && $this->mem_cache) {
+            $status = $this->mem_cache->write($key, $data);
+        }
+
+        if ($status) {
+            $args['id'] = $key;
+            $args['status'] = true;
+        }
+
+        return $args;
+    }
+
+    /**
+     * Save an attachment from a non-upload source (draft or forward)
+     */
+    function save($args)
+    {
+        $args = parent::save($args);
+
+        $this->_load_drivers();
+
+        if ($args['path'])
+          $args['data'] = file_get_contents($args['path']);
+
+        $key  = $this->_key($args);
+        $data = base64_encode($args['data']);
+
+        $status = $this->cache->write($key, $data);
+
+        if (!$status && $this->mem_cache) {
+            $status = $this->mem_cache->write($key, $data);
+        }
+
+        if ($status) {
+            $args['id'] = $key;
+            $args['status'] = true;
+        }
+
+        return $args;
+    }
+
+    /**
+     * Remove an attachment from storage
+     * This is triggered by the remove attachment button on the compose screen
+     */
+    function remove($args)
+    {
+        parent::remove($args);
+
+        $this->_load_drivers();
+
+        $status = $this->cache->remove($args['id']);
+
+        if (!$status && $this->mem_cache) {
+            $status = $this->cache->remove($args['id']);
+        }
+
+        // we cannot trust the result of any of the methods above
+        // assume true, attachments will be removed on cleanup
+        $args['status'] = true;
+
+        return $args;
+    }
+
+    /**
+     * When composing an html message, image attachments may be shown
+     * For this plugin, $this->get() will check the file and
+     * return it's contents
+     */
+    function display($args)
+    {
+        return $this->get($args);
+    }
+
+    /**
+     * When displaying or sending the attachment the file contents are fetched
+     * using this method. This is also called by the attachment_display hook.
+     */
+    function get($args)
+    {
+        // attempt to get file from local file system
+        $args = parent::get($args);
+
+        if ($args['path'] && ($args['status'] = file_exists($args['path'])))
+          return $args;
+
+        $this->_load_drivers();
+
+        // fetch from database if not found on FS
+        $data = $this->cache->read($args['id']);
+
+        // fetch from memcache if not found on FS and DB
+        if (($data === false || $data === null) && $this->mem_cache) {
+            $data = $this->mem_cache->read($args['id']);
+        }
+
+        if ($data) {
+            $args['data'] = base64_decode($data);
+            $args['status'] = true;
+        }
+
+        return $args;
+    }
+
+    /**
+     * Delete all temp files associated with this user
+     */
+    function cleanup($args)
+    {
+        $this->_load_drivers();
+
+        if ($this->cache) {
+            $this->cache->remove($args['group'], true);
+        }
+
+        if ($this->mem_cache) {
+            $this->mem_cache->remove($args['group'], true);
+        }
+
+        parent::cleanup($args);
+
+        $args['status'] = true;
+
+        return $args;
+    }
+}