add estimatefee endpoint to REST api

app/controllers/utils.js

@@ -0,0 +1,24 @@
+'use strict';
+
+/**
+ * Module dependencies.
+ */
+
+var Utils = require('../models/Utils'),
+  common = require('./common');
+
+exports.estimateFee = function(req, res) {
+
+  var nbBlocks = +req.query.nbBlocks || 2;
+  var utilsObject = new Utils();
+
+  var returnJsonp = function(err) {
+    if (err || !utilsObject)
+      return common.handleErrors(err, res);
+    else {
+      res.jsonp(utilsObject);
+    }
+  };
+
+  utilsObject.estimateFee(nbBlocks, returnJsonp);
+};

app/models/Utils.js

@@ -0,0 +1,22 @@
+'use strict';
+//var imports       = require('soop').imports();
+
+var bitcore = require('bitcore');
+var RpcClient = bitcore.RpcClient;
+var config = require('../../config/config');
+var rpc = new RpcClient(config.bitcoind);
+
+function Utils() {}
+
+Utils.prototype.estimateFee = function(n, next) {
+  var that = this;
+
+  rpc.estimateFee(n, function(err, info) {
+    if (err) return next(err);
+
+    that.feePerKB = info.result;
+    return next();
+  });
+};
+
+module.exports = require('soop')(Utils);

config/routes.js

@@ -53,6 +53,10 @@ module.exports = function(app) {
   app.get(apiPrefix + '/sync', st.sync);
   app.get(apiPrefix + '/peer', st.peer);
 
+  // Utils route
+  var utils = require('../app/controllers/utils');
+  app.get(apiPrefix + '/utils/estimatefee', utils.estimateFee);
+
   // Currency
   var currency = require('../app/controllers/currency');
   app.get(apiPrefix + '/currency', currency.index);