add npm total download badge via /npm/dt/{pkg}

server.js

@@ -1236,6 +1236,42 @@ cache(function(data, match, sendBadge, request) {
   });
 }));
 
+// npm total download integration.
+camp.route(/^\/npm\/dt\/(.*)\.(svg|png|gif|jpg|json)$/,
+cache(function (data, match, sendBadge, request) {
+    var pkg = encodeURIComponent(match[1]);  // eg, "express" or "@user/express"
+    var format = match[2];
+    var apiUrl = 'https://api.npmjs.org/downloads/range/1000-01-01:3000-01-01/' + pkg; // use huge range, will need to fix this in year 3000 :)
+    var badgeData = getBadgeData('downloads', data);
+    request(apiUrl, function (err, res, buffer) {
+        if (err != null) {
+            badgeData.text[1] = 'inaccessible';
+            sendBadge(format, badgeData);
+            return;
+        }
+
+        var totalDownloads = 0;
+        try {
+            var downloads = JSON.parse(buffer).downloads;
+            var index;
+            for (index = 0; index < downloads.length; index++) {
+                totalDownloads = totalDownloads + downloads[index].downloads;
+            }
+        } catch (e) {
+            badgeData.text[1] = 'invalid';
+            sendBadge(format, badgeData);
+            return;
+        }
+        badgeData.text[1] = metric(totalDownloads) + '/total';
+        if (totalDownloads === 0) {
+            badgeData.colorscheme = 'red';
+        } else {
+            badgeData.colorscheme = 'brightgreen';
+        }
+        sendBadge(format, badgeData);
+    });
+}));
+
 // npm version integration.
 camp.route(/^\/npm\/v\/(.*)\.(svg|png|gif|jpg|json)$/,
 cache(function(data, match, sendBadge, request) {