add rateLimiter to estimateFee

lib/common/defaults.js

@@ -108,6 +108,15 @@ Defaults.RateLimit = {
     max: 20, // start blocking after 20 request
     message: "Too many wallets created from this IP, please try again after an hour"
   },
+  estimateFee: {
+   windowMs: 60 * 10 *1000, // 10 min window
+    delayAfter: 10, // begin slowing down responses after the 3rd request 
+    delayMs: 300, // slow down subsequent responses by 3 seconds per request 
+ 
+    max: 20, // start blocking after 200 request
+    message: "Too many request"
+  },
+ 
   // otherPosts: {
   //   windowMs: 60 * 60 * 1000, // 1 hour window 
   //   max: 1200 , // 1 post every 3 sec average, max.

lib/expressapp.js

@@ -431,8 +431,21 @@ ExpressApp.prototype.start = function(opts, cb) {
     });
   });
 
+  var estimateFeeLimiter;
+
+  if (Defaults.RateLimit.estimateFee && !opts.ignoreRateLimiter) {
+    log.info('', 'Limiting estimate fee per IP: %d req/h', (Defaults.RateLimit.estimateFee.max / Defaults.RateLimit.estimateFee.windowMs * 60 * 60 * 1000).toFixed(2))
+    estimateFeeLimiter = new RateLimit(Defaults.RateLimit.estimateFee);
+    // router.use(/\/v\d+\/wallets\/$/, createWalletLimiter)
+  } else {
+    estimateFeeLimiter = function(req, res, next) {
+      next()
+    };
+  }
+
+
   // DEPRECATED
-  router.get('/v1/feelevels/', function(req, res) {
+  router.get('/v1/feelevels/', estimateFeeLimiter, function(req, res) {
     logDeprecated(req);
     var opts = {};
     if (req.query.network) opts.network = req.query.network;
@@ -452,7 +465,7 @@ ExpressApp.prototype.start = function(opts, cb) {
     });
   });
 
-  router.get('/v2/feelevels/', function(req, res) {
+  router.get('/v2/feelevels/', estimateFeeLimiter, function(req, res) {
     var opts = {};
     if (req.query.coin) opts.coin = req.query.coin;
     if (req.query.network) opts.network = req.query.network;