rate-limit-postgresql

A PostgreSQL store for the express-rate-limit middleware.

Installation

From the npm registry:

# Using npm
> npm install --save @acpr/rate-limit-postgresql
# Using yarn or pnpm
> yarn/pnpm add @acpr/rate-limit-postgresql

Usage

Functional examples for using rate-limit-postgresql are found in the following repository

let rateLimit = require('express-rate-limit')
let postgresStores = require('@acpr/rate-limit-postgresql')

let limiter = new RateLimit({
	store: new postgresStores.PostgresStore(
		{
			user: 'postgres',
			password: 'postgres',
			host: 'localhost',
			database: 'rate-limit',
			port: 5432,
		},
		'aggregated_store',
	),
	windowMs: 15 * 60 * 1000, // 15 minutes
	max: 3, // Limit each IP to 3 requests per `window` (here, per 15 minutes)
	message:
		'Too many accounts created from this IP, please try again after 15 minutes',
	standardHeaders: 'draft-7', // Set `RateLimit` and `RateLimit-Policy`` headers
	legacyHeaders: false,
})

//  apply to all requests
app.use(limiter)

Importing

This library is provided in ESM as well as CJS forms, and works with both Javascript and Typescript projects.

This package requires you to use Node 16 or above.

Import it in a CommonJS project (type: commonjs or no type field in package.json) as follows:

let postgresStores = require('@acpr/rate-limit-postgresql')

Import it in a ESM project (type: module in package.json) as follows:

import postgresStores from '@acpr/rate-limit-postgresql'

Configuration

Types of Postgres Stores

There are two different types of Postgres Stores:

1. PostgresStoreAggregatedIP (with the default PostgresStore constructor)- which aggregates the IP count in the table, as shown in the following table

key	session_id	count
192.168.1.1	1	3
192.168.2.1	1	1

2. PostgresStoreIndividualIP - which stores the IP of each request in a separate row (as shown in the following table) and performs the aggregation at a separate step

id	key	session_id	event_time
1	192.168.1.1	1	2023-09-13T07:40:09+00:00
2	192.168.1.1	1	2023-09-13T07:40:10+00:00
3	192.168.1.1	1	2023-09-13T07:40:11+00:00
4	192.168.2.1	1	2023-09-13T07:40:11+00:00

Note: The database uses UUID as a data type for IDs, the tables contain integers as IDs to keep illustration simple.

Constructor

Both types of store take the same input in their constructor

• config - The database configuration as specified in the node-postgres configuration.
• prefix - The unique name of the session (persisted in the database). Used by the double-count check to avoid false-positives when a key is counted twice, but with different prefixes.

Installation

Project license is specified in the license file. Third party licenses are located in the third_party_licenses folder