Added flag to get_graph_by_port_hostname() API call to switch port look up to use ifDescr

doc/API/API-Docs.md

@@ -316,6 +316,7 @@ Input:
  - to: This is the date you would like the graph to end - See http://oss.oetiker.ch/rrdtool/doc/rrdgraph.en.html for more information.
  - width: The graph width, defaults to 1075.
  - height: The graph height, defaults to 300.
+ - ifDescr: If this is set to true then we will use ifDescr to lookup the port instead of ifName. Pass the ifDescr value you want to search as you would ifName.
 
 Example:
 ```curl

html/includes/api_functions.inc.php

@@ -62,10 +62,17 @@ function get_graph_by_port_hostname() {
         $vars['to'] = $_GET['to'];
     }
 
+    if (!empty($vars['ifDescr']) == true) {
+        $port = 'ifDescr';
+    }
+    else {
+        $port = 'ifName';
+    }
+
     $vars['width']  = $_GET['width'] ?: 1075;
     $vars['height'] = $_GET['height'] ?: 300;
     $auth           = '1';
-    $vars['id']     = dbFetchCell('SELECT `P`.`port_id` FROM `ports` AS `P` JOIN `devices` AS `D` ON `P`.`device_id` = `D`.`device_id` WHERE `D`.`hostname`=? AND `P`.`ifName`=?', array($hostname, $vars['port']));
+    $vars['id']     = dbFetchCell("SELECT `P`.`port_id` FROM `ports` AS `P` JOIN `devices` AS `D` ON `P`.`device_id` = `D`.`device_id` WHERE `D`.`hostname`=? AND `P`.`$port`=?", array($hostname, $vars['port']));
     $app->response->headers->set('Content-Type', 'image/png');
     include 'includes/graphs/graph.inc.php';