update(server): remote rate metering

it relied on `express-rate` which hasn't been updated in 5 years and depends on deprecated functions in NodeJS
we will use Cloud Endpoints for rate metering instead

Closes #115

lib/controllers/api/index.js

@@ -1,7 +1,6 @@
 'use strict';
 
 var express = require('express'),
-  rate = require('express-rate'),
   config = require('../../config/config'),
   mongoose = require('mongoose'),
   SimpleApiKey = mongoose.model('SimpleApiKey'),
@@ -13,13 +12,9 @@ var express = require('express'),
 module.exports = function (app) {
   const EDGE_CACHE_MAX_AGE = 3600; // 1 hr
   var versions = [];
-  var rateHandler;
   var cacher;
 
   utils.fixCacher(Cacher);
-
-  console.log('Using in-memory rate handler...');
-  rateHandler = new rate.Memory.MemoryRateHandler();
   // In-Memory Cache
   cacher = new Cacher();
 
@@ -66,43 +61,6 @@ module.exports = function (app) {
     }
   };
 
-  var rateMiddleware = function (req, res, next) {
-
-    var limit = 10000;
-
-    if (req.apikey) {
-      limit = 50000;
-    }
-
-    var rm = rate.middleware({
-      handler: rateHandler,
-      limit: limit,
-      interval: 86400,
-      setHeadersHandler: function (req, res, rate, limit, resetTime) {
-        var remaining = limit - rate;
-
-        if (remaining < 0) {
-          remaining = 0;
-        }
-        res.setHeader('X-RateLimit-Limit', limit);
-        res.setHeader('X-RateLimit-Remaining', remaining);
-        res.setHeader('X-RateLimit-Reset', resetTime);
-      },
-      onLimitReached: function (req, res, rate, limit, resetTime, next) { // jshint ignore:line
-        res.json(403, {error: 'Rate limit exceeded. Check headers for limit information.'});
-      },
-      getRouteKey: function (req) { // jshint ignore:line
-        return 'api';
-      },
-      getRemoteKey: function (req) {
-        return req.headers['x-client-ip'] || req.ip;
-      }
-    });
-
-    rm(req, res, next);
-  };
-
-
   /**
    * Enable Google Edge caching for our API
    * @param req
@@ -123,7 +81,6 @@ module.exports = function (app) {
       var impl = express();
 
       impl.use(apiKeyMiddleware);
-      impl.use(rateMiddleware);
       impl.use(analyticsMiddleware(version));
       impl.use(edgeCache);
 

package.json

@@ -32,7 +32,6 @@
     "ejs": "0.8.4",
     "errorhandler": "1.5.0",
     "express": "4.15.2",
-    "express-rate": "0.0.1",
     "express-session": "1.15.1",
     "google-oauth-jwt": "0.1.7",
     "googleapis": "0.8.0",