--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/program/steps/mail/headers.inc	Thu Jan 04 15:52:31 2018 -0500
@@ -0,0 +1,56 @@
+<?php
+
+/**
+ +-----------------------------------------------------------------------+
+ | program/steps/mail/headers.inc                                        |
+ |                                                                       |
+ | This file is part of the Roundcube Webmail client                     |
+ | Copyright (C) 2005-2016, The Roundcube Dev Team                       |
+ |                                                                       |
+ | Licensed under the GNU General Public License version 3 or            |
+ | any later version with exceptions for skins & plugins.                |
+ | See the README file for a full license statement.                     |
+ |                                                                       |
+ | PURPOSE:                                                              |
+ |   Fetch message headers in raw format for display                     |
+ |                                                                       |
+ +-----------------------------------------------------------------------+
+ | Author: Aleksander Machniak <alec@alec.pl>                            |
+ +-----------------------------------------------------------------------+
+*/
+
+if ($uid = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_POST)) {
+    if ($pos = strpos($uid, '.')) {
+        $message = new rcube_message($uid);
+        $source  = $message->get_part_body(substr($uid, $pos + 1));
+        $source  = substr($source, 0, strpos($source, "\r\n\r\n"));
+    }
+    else {
+        $source = $RCMAIL->storage->get_raw_headers($uid);
+    }
+
+    if ($source !== false) {
+        $source = trim(rcube_charset::clean($source));
+        $source = htmlspecialchars($source);
+        $source = preg_replace(
+            array(
+                '/\n[\t\s]+/',
+                '/^([a-z0-9_:-]+)/im',
+                '/\r?\n/'
+            ),
+            array(
+                "\n&nbsp;&nbsp;&nbsp;&nbsp;",
+                '<font class="bold">\1</font>',
+                '<br />'
+            ), $source);
+
+        $OUTPUT->command('set_headers', $source);
+    }
+    else {
+        $RCMAIL->output->show_message('messageopenerror', 'error');
+    }
+
+    $OUTPUT->send();
+}
+
+exit;