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-rw-r--r--plugins/redundant_attachments/config.inc.php.dist13
-rw-r--r--plugins/redundant_attachments/redundant_attachments.php232
2 files changed, 245 insertions, 0 deletions
diff --git a/plugins/redundant_attachments/config.inc.php.dist b/plugins/redundant_attachments/config.inc.php.dist
new file mode 100644
index 000000000..6c317ead1
--- /dev/null
+++ b/plugins/redundant_attachments/config.inc.php.dist
@@ -0,0 +1,13 @@
+<?php
+
+// By default this plugin stores attachments in filesystem
+// and copies them into sql database.
+// In environments with replicated database it is possible
+// to use memcache as a fallback when write-master is unavailable.
+$rcmail_config['redundant_attachments_memcache'] = false;
+
+// When memcache is used, attachment data expires after
+// specied TTL time in seconds (max.2592000). Default is 12 hours.
+$rcmail_config['redundant_attachments_memcache_ttl'] = 12 * 60 * 60;
+
+?>
diff --git a/plugins/redundant_attachments/redundant_attachments.php b/plugins/redundant_attachments/redundant_attachments.php
new file mode 100644
index 000000000..3c71dcb40
--- /dev/null
+++ b/plugins/redundant_attachments/redundant_attachments.php
@@ -0,0 +1,232 @@
+<?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;
+ }
+}
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