Solid and easy to use rate limiting for hapi.

Installation · Usage · Plugin Options · Route Options · Response Headers

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Introduction

A hapi plugin to prevent brute-force attacks in your app. The rate limiter uses Redis to store rate-limit related data.

hapi-rate-limitor is built on top of these solid and awesome projects:

• async-ratelimiter
• ioredis
• request-ip

Each package solves its own problem perfectly. hapi-rate-limitor composes the solutions of each problem to a solid rate limit plugin for hapi.

Requirements

hapi v19 (or later) and Node.js v12 (or newer)

This plugin requires hapi v19 (or later) and Node.js v12 or newer.

Compatibility

Installation

Add hapi-rate-limitor as a dependency to your project:

npm i hapi-rate-limitor

Using hapi v18 or lower?

Use the 2.x release line:

npm i hapi-rate-limitor@2

Usage

The most straight forward to use hapi-rate-limitor is to register it to your hapi server.

This will use the default configurations of async-ratelimiter and ioredis.

await server.register({
  plugin: require('hapi-rate-limitor')
})

// went smooth like chocolate with default settings :)

Plugin Options

Customize the plugin’s default configuration with the following options:

• max: Integer, default: 60
  • the maximum number of requests allowed in a duration
• duration: Integer, default: 60000 (1 minute)
  • the lifetime window keeping records of a request in milliseconds
• namespace: String, default: 'hapi-rate-limitor'
  • the used prefix to create the rate limit identifier before storing the data
• redis: Object, default: undefined
  • the redis configuration property will be passed through to ioredis creating your custom Redis client
• extensionPoint: String, default: 'onPostAuth'
  • the request lifecycle extension point for rate limiting
• userAttribute: String, default: 'id'
  • the property name identifying a user (credentials) for dynamic rate limits. This option is used to access the value from request.auth.credentials.
• userLimitAttribute: String, default: 'rateLimit'
  • the property name identifying the rate limit value on dynamic rate limit. This option is used to access the value from request.auth.credentials.
• view: String, default: undefined
  • view path to render the view instead of throwing an error (this uses h.view(yourView, { total, remaining, reset }).code(429))
• enabled: Boolean, default: true
  • a shortcut to enable or disable the plugin, e.g. when running tests
• skip: Function, default: () => false
  • an async function with the signature async (request) to determine whether to skip rate limiting for a given request. The skip function retrieves the incoming request as the only argument
• ipWhitelist: Array, default: []
  • an array of whitelisted IP addresses that won’t be rate-limited. Requests from such IPs proceed the request lifecycle. Notice that the related responses won’t contain rate limit headers.
• getIp: Function, default: undefined
  • an async function with the signature async (request) to manually determine the requesting IP address. This is helpful if your load balancer provides the client IP address as the last item in the list of forwarded addresses (e.g. Heroku and AWS ELB)
• emitter: Object, default: server.events
  • an event emitter instance used to emit the rate-limitting events

All other options are directly passed through to async-ratelimiter.

await server.register({
  plugin: require('hapi-rate-limitor'),
  options: {
    redis: {
      port: 6379,
      host: '127.0.0.1'
    },
    extensionPoint: 'onPreAuth',
    namespace: 'hapi-rate-limitor',
    max: 2,                                     // a maximum of 2 requests
    duration: 1000,                              // per second (the value is in milliseconds),
    userAttribute: 'id',
    userLimitAttribute: 'rateLimit',
    view: 'rate-limit-exceeded',                // render this view when the rate limit exceeded
    enabled: true,
    skip: async (request) => {
      return request.path.includes('/admin')    // example: disable rate limiting for the admin panel
    },
    ipWhitelist: ['1.1.1.1'],                   // list of IP addresses skipping rate limiting
    getIp: async (request) => {                 // manually determine the requesting IP address
      const ips = request.headers['x-forwarded-for'].split(',')

      return ips[ips.length - 1]
    },
    emitter: yourEventEmitter,                  // your event emitter instance
  }
})

// went smooth like chocolate :)

You can also use a Redis connection string.

await server.register({
  plugin: require('hapi-rate-limitor'),
  options: {
    redis: 'redis://lolipop:SOME_PASSWORD@dokku-redis-lolipop:6379',
    extensionPoint: 'onPreAuth',
    namespace: 'hapi-rate-limitor'
    // ... etc
  }
})

// went smooth like chocolate :)

Please check the async-ratelimiter API for all options.

Events

hapi-rate-limitor dispatches the following three events in the rate-limiting lifecycle:

• rate-limit:attempt: before rate-limiting the request
• rate-limit:in-quota: after rate-limiting and only if the request’s limit is in the quota
• rate-limit:exceeded: after rate-limiting and only if the request’s quota is exceeded

Each event listener receives the related request as the only parameter. Here’s a sample listener:

emitter.on('rate-limit:exceeded', request => {
  // handle rate-limiting exceeded
})

You can pass your own event emitter instance as a config property while registering the hapi-rate-limitor plugin to your hapi server. By default, hapi-rate-limitor uses hapi’s server as an event emitter.

const EventEmitter = require('events')

const myEmitter = new EventEmitter()

await server.register({
  plugin: require('hapi-rate-limitor'),
  options: {
    emitter: myEmitter

    // … other plugin options
  }
})

Route Options

Customize the plugin’s default configuration on routes. A use case for this is a login route where you want to reduce the request limit even lower than the default limit.

On routes, hapi-rate-limitor respects all options related to rate limiting. Precisely, all options that async-ratelimiter supports. It does not accept Redis connection options or identifiers for dynamic rate limiting.

All other options are directly passed through to async-ratelimiter.

await server.register({
  plugin: require('hapi-rate-limitor'),
  options: {
    redis: {
      port: 6379,
      host: '127.0.0.1'
    },
    namespace: 'hapi-rate-limitor',
    max: 60,             // a maximum of 60 requests
    duration: 60 * 1000, // per minute (the value is in milliseconds)
  }
})

await server.route({
  method: 'POST',
  path: '/login',
  options: {
    handler: () {
      // do the login handling
    },
    plugins: {
      'hapi-rate-limitor': {
        max: 5,              // a maximum of 5 requests
        duration: 60 * 1000, // per minute
        enabled: false       // but it’s actually not enabled ;-)
      }
    }
  }
})

// went smooth like chocolate :)

Please check the async-ratelimiter API for all options.

Dynamic Rate Limits

To make use of user-specific rate limits, you need to configure the userAttribute and userLimitAttribute attributes in the hapi-rate-limitor options.

These attributes are used to determine the rate limit for an authenticated user. The userAttribute is the property name that uniquely identifies a user. The userLimitAttribute is the property name that contains the rate limit value.

await server.register({
  plugin: require('hapi-rate-limitor'),
  options: {
    userAttribute: 'id',
    userLimitAttribute: 'rateLimit',
    max: 500,                          // a maximum of 500 requests (default is 2500)
    duration: 60 * 60 * 1000           // per hour (the value is in milliseconds)
    // … other plugin options
  }
})

This will calculate the maximum requests individually for each authenticated user based on the user’s id and 'rateLimit' attributes. Imagine the following user object as an authenticated user:

/**
 * the authenticated user object may contain a custom rate limit attribute.
 * In this case, it’s called "rateLimit".
 */
request.auth.credentials = {
  id: 'custom-uuid',
  rateLimit: 1750,
  name: 'Marcus'
  // … further attributes
}

For this specific user, the maximum amount of requests is 1750 per hour (and not the plugin’s default 500).

hapi-rate-limitor uses the plugin’s limit if the request is unauthenticated or request.auth.credentials doesn’t contain a rate-limit-related attribute.

Response Headers

The plugin sets the following response headers:

• X-Rate-Limit-Limit: total request limit (max) within duration
• X-Rate-Limit-Remaining: remaining quota until reset
• X-Rate-Limit-Reset: time since epoch in seconds that the rate limiting period will end

Feature Requests

Do you miss a feature? Please don’t hesitate to create an issue with a short description of your desired addition to this plugin.

Links & Resources

• hapi tutorial series with 100+ tutorials

Contributing

1. Create a fork
2. Create your feature branch: git checkout -b my-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request 🚀

License

MIT © Future Studio

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