eureka

.gitignore

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+node_modules

Makefile

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+.PHONY: test
+
+test:
+	./node_modules/.bin/mocha tests

README.md

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-rate-limitter
+## Express rate-limitter
-=============
+Rate limiting middleware for Express applications.
 
-Rate limiting middleware for Express
+
+``` js
+var limitter = require('expa').limitter(app, client)
+
+limitter({
+  path: '/like',
+  method: 'get',
+  lookup: ['req.user.id', 'req.connection.remoteAddress'],
+  total: 100,
+  expire: 1000 * 60 * 60
+})
+
+```

index.js

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+module.exports = function (app, db) {
+  return function (opts) {
+    app[opts.method](opts.path, function (req, res, next) {
+      opts.lookup = Array.isArray(opts.lookup) ? opts.lookup : [opts.lookup]
+      var lookups = opts.lookup.map(function (item) {
+        return item + item.split('.').reduce(function (prev, cur) {
+          return prev[cur]
+        }, req)
+      }).join(':')
+
+      var key = 'ratelimit:' + path + ':' + method + ':' + lookups
+      db.get(key, function (err, limit) {
+        var now = Date.now()
+        limit = limit ? JSON.parse(limit) : {
+          total: total,
+          remaining: total,
+          reset: now + opts.expire
+        }
+
+        if (now > limit.reset) limit.reset = now + opts.expire
+
+        limit.remaining = Number(limit.remaining) - 1
+
+        db.set(key, JSON.stringify(limit)
+
+        res.set('X-RateLimit-Limit', limit.total)
+        res.set('X-RateLimit-Remaining', limit.remaining)
+
+        if (limit.remaining) return next()
+
+        var after = (limit.reset - Date.now()) / 1000
+
+        res.set('Retry-After', after)
+        res.send(429, 'Rate limit exceeded')
+      })
+
+    }
+  }
+}

package.json

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+{
+  "name": "rate-limitter",
+  "version": "0.0.0",
+  "description": "rate limitter middleware for express applications",
+  "main": "index.js",
+  "author": "Dustin Diaz",
+  "license": "MIT",
+  "scripts": {
+    "test": "make test"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/ded/rate-limitter.git"
+  },
+  "bugs": {
+    "url": "https://github.com/ded/rate-limitter/issues"
+  },
+  "homepage": "https://github.com/ded/rate-limitter",
+  "devDependencies": {
+    "mocha": "~1.18.2"
+  }
+}