<?php
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/**
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* Database Attachments
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*
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* This plugin which provides database backed storage for temporary
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* attachment file handling. The primary advantage of this plugin
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* is its compatibility with round-robin dns multi-server roundcube
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* installations.
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*
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* This plugin relies on the core filesystem_attachments plugin
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*
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* @author Ziba Scott <ziba@umich.edu>
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* @author Aleksander Machniak <alec@alec.pl>
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* @version @package_version@
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*/
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require_once INSTALL_PATH . 'plugins/filesystem_attachments/filesystem_attachments.php';
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class database_attachments extends filesystem_attachments
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{
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// Cache object
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protected $cache;
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// A prefix for the cache key used in the session and in the key field of the cache table
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const PREFIX = "ATTACH";
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/**
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* Save a newly uploaded attachment
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*/
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function upload($args)
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{
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$args['status'] = false;
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$cache = $this->get_cache();
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$key = $this->_key($args);
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$data = file_get_contents($args['path']);
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if ($data === false) {
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return $args;
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}
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$data = base64_encode($data);
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$status = $cache->write($key, $data);
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if ($status) {
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$args['id'] = $key;
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$args['status'] = true;
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$args['path'] = null;
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}
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return $args;
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}
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/**
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* Save an attachment from a non-upload source (draft or forward)
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*/
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function save($args)
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{
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$args['status'] = false;
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$cache = $this->get_cache();
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$key = $this->_key($args);
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if ($args['path']) {
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$args['data'] = file_get_contents($args['path']);
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if ($args['data'] === false) {
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return $args;
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}
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}
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$data = base64_encode($args['data']);
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$status = $cache->write($key, $data);
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if ($status) {
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$args['id'] = $key;
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$args['status'] = true;
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}
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return $args;
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}
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/**
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* Remove an attachment from storage
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* This is triggered by the remove attachment button on the compose screen
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*/
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function remove($args)
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{
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$cache = $this->get_cache();
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$status = $cache->remove($args['id']);
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$args['status'] = true;
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return $args;
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}
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/**
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* When composing an html message, image attachments may be shown
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* For this plugin, $this->get() will check the file and
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* return it's contents
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*/
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function display($args)
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{
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return $this->get($args);
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}
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/**
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* When displaying or sending the attachment the file contents are fetched
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* using this method. This is also called by the attachment_display hook.
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*/
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function get($args)
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{
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$cache = $this->get_cache();
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$data = $cache->read($args['id']);
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if ($data) {
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$args['data'] = base64_decode($data);
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$args['status'] = true;
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}
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return $args;
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}
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/**
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* Delete all temp files associated with this user
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*/
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function cleanup($args)
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{
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// check if cache object exist, it may be empty on session_destroy (#1489726)
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if ($cache = $this->get_cache()) {
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$cache->remove($args['group'], true);
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}
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}
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/**
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* Helper method to generate a unique key for the given attachment file
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*/
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protected function _key($args)
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{
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$uname = $args['path'] ? $args['path'] : $args['name'];
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return $args['group'] . md5(mktime() . $uname . $_SESSION['user_id']);
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}
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/**
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* Initialize and return cache object
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*/
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protected function get_cache()
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{
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if (!$this->cache) {
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$this->load_config();
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$rcmail = rcube::get_instance();
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$ttl = 12 * 60 * 60; // default: 12 hours
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$ttl = $rcmail->config->get('database_attachments_cache_ttl', $ttl);
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$type = $rcmail->config->get('database_attachments_cache', 'db');
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$prefix = self::PREFIX;
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// Add session identifier to the prefix to prevent from removing attachments
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// in other sessions of the same user (#1490542)
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if ($id = session_id()) {
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$prefix .= $id;
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}
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// Init SQL cache (disable cache data serialization)
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$this->cache = $rcmail->get_cache($prefix, $type, $ttl, false);
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}
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return $this->cache;
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}
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}
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