webui: Timezone support for graylog (#7799)

* added timezone support for graylog

* using default user timezone if none is configured

* newline fix, added copyrights

* copyright correction

* copyright correction

* copyright fix

doc/Extensions/Graylog.md

@@ -24,6 +24,13 @@ $config['graylog']['password'] = 'admin';
 $config['graylog']['version']  = '2.1';
 ```
 
+Graylog messages are stored using GMT timezone. You can display graylog messages in LibreNMS webui using your desired timezone by setting following option in config.php:
+
+```php
+$config['graylog']['timezone'] = 'Europe/Bucharest';
+```
+> Timezone must be PHP supported timezones, available at: <a href="http://php.net/manual/en/timezones.php">http://php.net/manual/en/timezones.php</a>
+
 > Since Graylog 2.1, the default API path is /api/
 
 If you are running a version earlier than Graylog then please set `$config['graylog']['version']` to the version 

html/includes/common/graylog.inc.php

@@ -1,5 +1,4 @@
 <?php
-
 /*
  * LibreNMS
  *
@@ -10,7 +9,13 @@
  * Free Software Foundation, either version 3 of the License, or (at your
  * option) any later version.  Please see LICENSE.txt at the top level of
  * the source code distribution for details.
- */
+ *
+ * @package    LibreNMS
+ * @subpackage webui
+ * @link       http://librenms.org
+ * @copyright  2017 LibreNMS
+ * @author     LibreNMS Contributors
+*/
 
 if (empty($results_limit)) {
     $results_limit = 25;
@@ -21,7 +26,7 @@ $tmp_output = '<h3>Graylog</h3>
     <table id="graylog" class="table table-hover table-condensed graylog">
         <thead>
             <tr>
-                <th data-column-id="timestamp">Timestamp</th>
+                <th data-column-id="timestamp" data-formatter="browserTime">Timestamp</th>
                 <th data-column-id="source">Source</th>
                 <th data-column-id="message">Message</th>
                 <th data-column-id="facility" data-visible="false">Facility</th>
@@ -71,6 +76,12 @@ if (empty($filter_device) && isset($_POST['hostname'])) {
     $filter_device = mres($_POST['hostname']);
 }
 
+if (isset($config['graylog']['timezone'])) {
+    $timezone = 'row.timestamp;';
+} else {
+    $timezone = 'moment.parseZone(row.timestamp).local().format("YYYY-MM-DD HH:MM:SS");';
+}
+
 $tmp_output .= '
                 "<div class=\"form-group\"><select name=\"range\" class=\"form-group input-sm\">"+
                 "<option value=\"300\">Search last 5 minutes</option>"+
@@ -94,6 +105,11 @@ $tmp_output .= '
     var graylog_grid = $("#graylog").bootgrid({
         ajax: true,
         rowCount: ['. $results_limit .', 25,50,100,250,-1],
+        formatters: {
+            "browserTime": function(column, row) {
+                return '.$timezone.'
+            }
+        },
 ';
 
 if (isset($no_form) && $no_form !== true) {

html/includes/table/graylog.inc.php

@@ -1,5 +1,4 @@
 <?php
-
 /*
  * LibreNMS
  *
@@ -10,7 +9,13 @@
  * Free Software Foundation, either version 3 of the License, or (at your
  * option) any later version.  Please see LICENSE.txt at the top level of
  * the source code distribution for details.
- */
+ *
+ * @package    LibreNMS
+ * @subpackage webui
+ * @link       http://librenms.org
+ * @copyright  2017 LibreNMS
+ * @author     LibreNMS Contributors
+*/
 
 $filter_hostname = mres($_POST['hostname']);
 $filter_range = mres($_POST['range']);
@@ -62,8 +67,21 @@ $context = stream_context_create(array(
 $messages = json_decode(file_get_contents($graylog_url, false, $context), true);
 
 foreach ($messages['messages'] as $message) {
+    if (isset($config['graylog']['timezone'])) {
+        $userTimezone = new DateTimeZone($config['graylog']['timezone']);
+        $graylogTime = new DateTime($message['message']['timestamp']);
+        $offset = $userTimezone->getOffset($graylogTime);
+
+        $timeInterval = DateInterval::createFromDateString((string)$offset . 'seconds');
+        $graylogTime->add($timeInterval);
+        $displayTime = $graylogTime->format('Y-m-d H:i:s');
+    } else {
+        $displayTime = $message['message']['timestamp'];
+    }
+
+
     $response[] = array(
-                      'timestamp' => $message['message']['timestamp'],
+        'timestamp' => $displayTime,
         'source'    => '<a href="'.generate_url(array('page'=>'device', 'device'=>$message['message']['source'])).'">'.$message['message']['source'].'</a>',
         'message'    => $message['message']['message'],
         'facility'  => $message['message']['facility'],

html/pages/graylog.inc.php

@@ -1,4 +1,17 @@
 <?php
+/*
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.  Please see LICENSE.txt at the top level of
+ * the source code distribution for details.
+ *
+ * @package    LibreNMS
+ * @subpackage webui
+ * @link       http://librenms.org
+ * @copyright  2017 LibreNMS
+ * @author     LibreNMS Contributors
+*/
 
 $no_refresh = true;
 require_once 'includes/common/graylog.inc.php';