add REST endpoint

lib/blockchainexplorers/insight.js

@@ -114,11 +114,11 @@ Insight.prototype.estimateFee = function(nbBlocks, cb) {
   var args = {
     method: 'GET',
     url: url,
+    json: true,
   };
-
   request(args, function(err, res, body) {
     if (err || res.statusCode !== 200) return cb(err || res);
-    return cb(null, body.feePerKB);
+    return cb(null, body);
   });
 };
 

lib/expressapp.js

@@ -266,6 +266,16 @@ ExpressApp.prototype.start = function(opts, cb) {
     });
   });
 
+  router.get('/v1/feelevels/', function(req, res) {
+    var opts = {};
+    if (req.query.network) opts.network = req.query.network;
+    var server = getServer(req, res);
+    server.getFeeLevels(opts, function(err, feeLevels) {
+      if (err) return returnError(err, res, req);
+      res.json(feeLevels);
+    });
+  });
+
   router.post('/v1/txproposals/:id/signatures/', function(req, res) {
     getServerWithAuth(req, res, function(server) {
       req.body.txProposalId = req.params['id'];

lib/server.js

@@ -777,10 +777,11 @@ WalletService.prototype._sampleFeeLevels = function(network, points, cb) {
         log.error('Error estimating fee', err);
         return next(err);
       }
-      if (result.feePerKB < 0) {
+      var feePerKB = _.isObject(result) ? +(result.feePerKB) : -1;
+      if (feePerKB < 0) {
         log.warn('Could not compute fee estimation (nbBlocks=' + p + ')');
       }
-      return next(null, [p, result.feePerKB * 1e8]);
+      return next(null, [p, feePerKB * 1e8]);
     });
   }, function(err, results) {
     if (err) return cb(err);