--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/virtuser_query/virtuser_query.php	Thu Jan 04 15:50:29 2018 -0500
@@ -0,0 +1,164 @@
+<?php
+
+/**
+ * DB based User-to-Email and Email-to-User lookup
+ *
+ * Add it to the plugins list in config.inc.php and set
+ * SQL queries to resolve usernames, e-mail addresses and hostnames from the database
+ * %u will be replaced with the current username for login.
+ * %m will be replaced with the current e-mail address for login.
+ *
+ * Queries should select the user's e-mail address, username or the imap hostname as first column
+ * The email query could optionally select identity data columns in specified order:
+ *    name, organization, reply-to, bcc, signature, html_signature
+ *
+ * $config['virtuser_query'] = array('email' => '', 'user' => '', 'host' => '', 'alias' => '');
+ *
+ * The email query can return more than one record to create more identities.
+ * This requires identities_level option to be set to value less than 2.
+ *
+ * By default Roundcube database is used. To use different database (or host)
+ * you can specify DSN string in $config['virtuser_query_dsn'] option.
+ *
+ * @author Aleksander Machniak <alec@alec.pl>
+ * @author Steffen Vogel
+ * @author Tim Gerundt
+ * @license GNU GPLv3+
+ */
+class virtuser_query extends rcube_plugin
+{
+    private $config;
+    private $app;
+    private $db;
+
+    function init()
+    {
+        $this->app    = rcmail::get_instance();
+        $this->config = $this->app->config->get('virtuser_query');
+
+        if (!empty($this->config)) {
+            if (is_string($this->config)) {
+                $this->config = array('email' => $this->config);
+            }
+
+            if ($this->config['email']) {
+                $this->add_hook('user2email', array($this, 'user2email'));
+            }
+            if ($this->config['user']) {
+                $this->add_hook('email2user', array($this, 'email2user'));
+            }
+            if ($this->config['host']) {
+                $this->add_hook('authenticate', array($this, 'user2host'));
+            }
+            if ($this->config['alias']) {
+                $this->add_hook('authenticate', array($this, 'alias2user'));
+            }
+        }
+    }
+
+    /**
+     * User > Email
+     */
+    function user2email($p)
+    {
+        $dbh = $this->get_dbh();
+
+        $sql_result = $dbh->query(preg_replace('/%u/', $dbh->escape($p['user']), $this->config['email']));
+
+        while ($sql_arr = $dbh->fetch_array($sql_result)) {
+            if (strpos($sql_arr[0], '@')) {
+                if ($p['extended'] && count($sql_arr) > 1) {
+                    $result[] = array(
+                        'email'          => rcube_utils::idn_to_ascii($sql_arr[0]),
+                        'name'           => (string) $sql_arr[1],
+                        'organization'   => (string) $sql_arr[2],
+                        'reply-to'       => (string) rcube_utils::idn_to_ascii($sql_arr[3]),
+                        'bcc'            => (string) rcube_utils::idn_to_ascii($sql_arr[4]),
+                        'signature'      => (string) $sql_arr[5],
+                        'html_signature' => (int) $sql_arr[6],
+                    );
+                }
+                else {
+                    $result[] = $sql_arr[0];
+                }
+
+                if ($p['first']) {
+                    break;
+                }
+            }
+        }
+
+        $p['email'] = $result;
+
+        return $p;
+    }
+
+    /**
+     * EMail > User
+     */
+    function email2user($p)
+    {
+        $dbh = $this->get_dbh();
+
+        $sql_result = $dbh->query(preg_replace('/%m/', $dbh->escape($p['email']), $this->config['user']));
+
+        if ($sql_arr = $dbh->fetch_array($sql_result)) {
+            $p['user'] = $sql_arr[0];
+        }
+
+        return $p;
+    }
+
+    /**
+     * User > Host
+     */
+    function user2host($p)
+    {
+        $dbh = $this->get_dbh();
+
+        $sql_result = $dbh->query(preg_replace('/%u/', $dbh->escape($p['user']), $this->config['host']));
+
+        if ($sql_arr = $dbh->fetch_array($sql_result)) {
+            $p['host'] = $sql_arr[0];
+        }
+
+        return $p;
+    }
+
+    /**
+     * Alias > User
+     */
+    function alias2user($p)
+    {
+        $dbh = $this->get_dbh();
+
+        $sql_result = $dbh->query(preg_replace('/%u/', $dbh->escape($p['user']), $this->config['alias']));
+
+        if ($sql_arr = $dbh->fetch_array($sql_result)) {
+            $p['user'] = $sql_arr[0];
+        }
+
+        return $p;
+    }
+
+    /**
+     * Initialize database handler
+     */
+    function get_dbh()
+    {
+        if (!$this->db) {
+            if ($dsn = $this->app->config->get('virtuser_query_dsn')) {
+                // connect to the virtuser database
+                $this->db = rcube_db::factory($dsn);
+                $this->db->set_debug((bool)$this->app->config->get('sql_debug'));
+                $this->db->db_connect('r'); // connect in read mode
+            }
+            else {
+                $this->db = $this->app->get_dbh();
+            }
+        }
+
+        return $this->db;
+    }
+
+}