Add the Site Suggest server node.js code.

siteSuggest/app.js

@@ -0,0 +1,46 @@
+const BASE_DOMAIN = "https://sitesuggest.mozillalabs.com/";
+const CATEGORIES_FILE = "top_categories_domains_filtered_thumbs.json";
+
+// Read in the top categories data
+var topCategories, knownCategories;
+require("fs").readFile(__dirname + "/" + CATEGORIES_FILE, "utf8", function(err, json) {
+  topCategories = JSON.parse(json);
+  knownCategories = Object.keys(topCategories);
+});
+
+// Handle requests for site suggestion for a category
+require("http").createServer(function(request, response) {
+  function respond(statusCode, dataObject) {
+    response.writeHead(statusCode, {
+      "Content-Type": "application/json",
+      "Vary": "Category"
+    });
+    response.end(JSON.stringify(dataObject));
+  }
+
+  // Treat all other requests as a suggestion, so bail without a category
+  var category = request.headers.category;
+  if (category == null) {
+    respond(400, null);
+    return;
+  }
+
+  // Bail if the category is unknown
+  category = category.toLowerCase();
+  if (knownCategories.indexOf(category) == -1) {
+    respond(404, null);
+    return;
+  }
+
+  // Pick one site to recommend
+  var choices = topCategories[category];
+  var choice = choices[Math.floor(Math.random() * choices.length)];
+
+  // Package up a response for the site suggestion
+  respond(200, {
+    category: category,
+    image: BASE_DOMAIN + "images/" + choice.thumb_filename,
+    title: choice.title,
+    url: choice.url
+  });
+}).listen(8080);