make getjson use node request

Packages/dicomweb/server/getJSON.js

@@ -1,30 +1,57 @@
-DICOMWeb.getJSON = function(url, options) {
-    var getOptions = {
+var http = Npm.require('http'), url = Npm.require('url');
+
+function makeRequest(geturl, options, callback) {
+    var parsed = url.parse(geturl), jsonHeaders = ['application/json', 'application/dicom+json'];
+    
+    var requestOpt = {
+        hostname: parsed.hostname,
+        port: parsed.port,
         headers: {
             Accept: 'application/json'
-        }
+        },
+        path: parsed.path,
+        method: 'GET'
     };
-
     if (options.auth) {
-        getOptions.auth = options.auth;
+        requestOpt.auth = options.auth;
     }
 
+    var req = http.request(requestOpt, function(resp) {
+        if (jsonHeaders.indexOf(resp.headers['content-type']) == -1) {
+            callback('We only support json', null);
+            return;
+        }
+
+        var output = '';
+        resp.setEncoding('utf8');
+        resp.on('data', function(chunk){
+          output += chunk;
+        });
+        resp.on('end', function(){
+          callback(null, {data: JSON.parse(output)});
+        });
+    });
+    req.end();
+}
+var makeRequestSync = Meteor.wrapAsync(makeRequest);
+
+DICOMWeb.getJSON = function(geturl, options) {
     if (options.logRequests) {
-        console.log(url);
+        console.log(geturl);
     }
 
     if (options.logTiming) {
-        console.time(url);
+        console.time(geturl);
     }
 
-    var result = HTTP.get(url, getOptions);
+    var result = makeRequestSync(geturl, options);
 
     if (options.logTiming) {
-        console.timeEnd(url);
+        console.timeEnd(geturl);
     }
 
     if (options.logResponses) {
-        console.log(result.data);
+        console.log(result);
     }
 
     return result;