Started implementing ordering

Leaving this for now as Onionoo doesn't currently support ordering by anything other than consensus_weight.
Submitted a ticket: https://bugs.torproject.org/21095

controllers/listing.js

@@ -1,5 +1,10 @@
 const tor = require('../lib/tor');
 
+const orderValues = [
+  'consensus_weight',
+  'first_seen'
+];
+
 module.exports = (req, res, next) => {
 
   let title = 'Top nodes by consensus weight';
@@ -16,13 +21,17 @@ module.exports = (req, res, next) => {
   if(req.query.p) {
     query.offset = (query.limit * req.query.p) - query.limit;
   }
+  if(req.query.order && orderValues.includes(req.query.order)) {
+    query.order = req.query.order;
+  }
 
   tor.listNodes(query)
     .then(nodes => res.render('listing.html', {
       pageTitle: req.query.s ? `Search: ${req.query.s}` : false,
       title: title,
       nodes: nodes,
-      numOfNodes: query.limit
+      numOfNodes: query.limit,
+      orderValues: orderValues
     }))
     .catch(err => {
       if(err.statusCode == 400 && req.query.s) {

views/listing.html

@@ -3,6 +3,15 @@
 {% block main %}
 
   <h2>{{ title }}</h2>
+  <form action="/">
+    <input type="hidden" name="s" value="{{ req.query.s }}" />
+    <input type="hidden" name="p" value="{{ req.query.p }}" />
+    <select name="order">
+      {% for order in orderValues %}
+      <option value="{{ order }}">{{ order }}</option>
+      {% endfor %}
+    </select>
+    <input type="submit" />
   {% if nodes.length %}
     <table>
       <thead>