Added jsonp support

Closes #47

lib/document_handler.js

@@ -15,12 +15,23 @@ var DocumentHandler = function(options) {
 DocumentHandler.defaultKeyLength = 10;
 
 // Handle retrieving a document
-DocumentHandler.prototype.handleGet = function(key, response, skipExpire) {
+DocumentHandler.prototype.handleGet = function(key, callback, response, skipExpire) {
   this.store.get(key, function(ret) {
     if (ret) {
       winston.verbose('retrieved document', { key: key });
-      response.writeHead(200, { 'content-type': 'application/json' });
-      response.end(JSON.stringify({ data: ret, key: key }));
+      var responseData = JSON.stringify({ data: ret, key: key });
+      if (callback) {
+        if (callback.match(/^[a-z0-9]+$/i)) {
+          response.writeHead(200, { 'content-type': 'application/javascript' });
+          response.end(callback + '(' + responseData + ');');
+        } else {
+          response.writeHead(400, { 'content-type': 'application/json' });
+          response.end(JSON.stringify({ message: 'invalid callback function name' }));
+        }
+      } else {
+        response.writeHead(200, { 'content-type': 'application/json' });
+        response.end(responseData);
+      }
     }
     else {
       winston.warn('document not found', { key: key });

server.js

@@ -116,8 +116,10 @@ connect.createServer(
     // get documents
     app.get('/documents/:id', function(request, response, next) {
       var skipExpire = !!config.documents[request.params.id];
+      var parsedUrl = url.parse(request.url, true);
       return documentHandler.handleGet(
         request.params.id,
+        parsedUrl.query.callback,
         response,
         skipExpire
       );