(dashboard) the weirdness around stats.inc, getstats.php and ajax.js needs to...

(dashboard) the weirdness around stats.inc, getstats.php and ajax.js needs to be replaced with a more structural solution.

Because all current widgets depend on legacy code and we don't want to pollute new style mvc code with it, we choose to build a new broker in the old structure.
This commit only includes the basic setup for the broken and an empty gateway_api() function

src/www/widgets/api/get.php

+<?php
+/*
+    Copyright (C) 2016 Deciso B.V.
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+    AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+    AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+    POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/*
+  Simple wrapper to retrieve data for widgets using legacy code.
+  Returns a json object containing a list of available plugins and for all requested plugins (parameter load) the
+  collected data.
+*/
+
+header("Last-Modified: " . gmdate( "D, j M Y H:i:s" ) . " GMT" );
+header("Expires: " . gmdate( "D, j M Y H:i:s", time() ) . " GMT" );
+header("Cache-Control: no-store, no-cache, must-revalidate" );
+header("Cache-Control: post-check=0, pre-check=0", FALSE);
+header("Pragma: no-cache");
+
+require_once("guiconfig.inc");
+// require legacy scripts, so plugins don't have to load them
+require_once("system.inc");
+require_once("config.inc");
+require_once("filter.inc");
+require_once("pfsense-utils.inc");
+require_once("interfaces.inc");
+
+// parse request, load parameter contains all plugins that should be loaded for this request
+if (!empty($_REQUEST['load'])) {
+    $loadPluginsList = explode(',', $_REQUEST['load']);
+} else {
+    $loadPluginsList = array();
+}
+
+// add metadata
+$result['system'] = $g['product_name'];
+// available plugins
+$result['plugins'] = array();
+// collected data
+$result['data'] = array();
+
+// probe plugins
+foreach (glob(__DIR__."/plugins/*.php") as $filename) {
+    $pluginName = basename($filename, '.php');
+    $result['plugins'][] = $pluginName;
+    if (in_array($pluginName, $loadPluginsList)) {
+        require $filename;
+        $pluginFunctionName = $pluginName."_api";
+        if (function_exists($pluginName."_api")) {
+            $result['data'][$pluginName] = $pluginFunctionName();
+        }
+    }
+}
+// output result
+echo json_encode($result);

src/www/widgets/api/plugins/gateway.php

+<?php
+/*
+    Copyright (C) 2016 Deciso B.V.
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+    AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+    AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+    POSSIBILITY OF SUCH DAMAGE.
+*/
+
+function gateway_api()
+{
+    return array();
+}