Support federation names

The blobvault has all of the data it needs to support federation names
on a given domain, so we should support that as well as the blobvault
protocol.

api/federation.js

@@ -0,0 +1,38 @@
+var config = require('../config');
+var response = require('response');
+var libutils = require('../lib/utils');
+
+exports.store;
+var federation = function (req, res) {
+    if (!req.query.domain || req.query.domain !== config.federation.domain) {
+        response.json({"error":"invalidParams","result":"error","error_message":"Invalid domain"}).status(400).pipe(res);
+        return;
+    }
+
+    if (!req.query.destination) {
+      if (req.query.user) { // Compatability
+          req.query.destination = req.query.user;
+      } else {
+        response.json({"error":"invalidParams","result":"error","error_message":"No destination provided"}).status(400).pipe(res);
+        return;
+      }
+    }
+
+    var normalized_username = libutils.normalizeUsername(req.query.destination);
+
+    exports.store.read({username:normalized_username,res:res},function(resp) {
+        if (resp.exists) {
+            // this is a 200 
+            response.json({ federation_json: {
+                type: "federation_record",
+                destination: req.query.destination,
+                domain: config.federation.domain,
+                destination_address: resp.address
+            }}).pipe(res);
+        } else {
+            response.json({"error":"noSuchUser","result":"error","error_message":"No such alias on that domain"}).status(404).pipe(res);
+        }
+    });
+};
+
+exports.federation = federation;

api/index.js

@@ -1,8 +1,10 @@
 exports.user = require('./user');
+exports.federation = require('./federation');
 exports.blob = require('./blob');
 exports.meta = require('./meta');
 exports.setStore = function(store) {
     exports.user.store = store;
+    exports.federation.store = store;
     exports.blob.setStore(store);
 };
 var error = require('../error');

config-example.js

@@ -8,6 +8,11 @@ exports.port = 8080;
 // Public URL for this blobvault (required for authinfo)
 exports.url = "https://blobvault.example.com";
 
+// Federation names provider settings
+exports.federation = {
+    domain: "example.com"
+};
+
 // SSL settings
 exports.ssl = false;
 

server.js

@@ -35,6 +35,7 @@ app.post('/v1/user/:username', guard.locked, ecdsa.middleware, api.user.rename);
 app.delete('/v1/user', guard.locked, hmac.middleware, api.blob.delete);
 app.get('/v1/user/:username', api.user.get);
 app.get('/v1/user/:username/verify/:token', api.user.verify);
+app.get('/v1/federation', api.federation.federation);
 
 // JSON handlers
 app.get('/v1/blob/:blob_id', api.blob.get);