├── CHANGELOG.md ├── .prettierrc ├── vitest.config.ts ├── tsconfig.json ├── .github └── workflows │ └── test.yml ├── dist ├── index.d.mts ├── index.d.ts └── index.mjs ├── package.json ├── src ├── index.test.ts └── index.ts ├── .gitignore ├── README.md └── LICENSE /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | # @hono/cloudflare-rate-limit 2 | 3 | ## 0.0.1 4 | 5 | Initial release. 6 | -------------------------------------------------------------------------------- /.prettierrc: -------------------------------------------------------------------------------- 1 | { 2 | "printWidth": 140, 3 | "singleQuote": false, 4 | "semi": true, 5 | "useTabs": true 6 | } 7 | -------------------------------------------------------------------------------- /vitest.config.ts: -------------------------------------------------------------------------------- 1 | /// 2 | import { defineConfig } from 'vitest/config' 3 | 4 | export default defineConfig({ 5 | test: { 6 | globals: true, 7 | }, 8 | }) 9 | -------------------------------------------------------------------------------- /tsconfig.json: -------------------------------------------------------------------------------- 1 | { 2 | "compilerOptions": { 3 | "target": "ES2022", 4 | "module": "commonjs", 5 | "declaration": true, 6 | "moduleResolution": "Node", 7 | "esModuleInterop": true, 8 | "forceConsistentCasingInFileNames": true, 9 | "strict": true, 10 | "skipLibCheck": true, 11 | "noUnusedLocals": false, 12 | "noUnusedParameters": true, 13 | "types": ["jest", "node", "@cloudflare/workers-types"], 14 | "rootDir": "./src", 15 | "outDir": "./dist" 16 | }, 17 | "include": ["src/**/*.ts"] 18 | } 19 | -------------------------------------------------------------------------------- /.github/workflows/test.yml: -------------------------------------------------------------------------------- 1 | name: Build 2 | 3 | on: 4 | push: 5 | branches: [ "main" ] 6 | pull_request: 7 | branches: [ "main" ] 8 | 9 | jobs: 10 | build: 11 | runs-on: ubuntu-latest 12 | strategy: 13 | matrix: 14 | node-version: [18.x, 20.x] 15 | steps: 16 | - uses: actions/checkout@v4 17 | - name: Use Node.js ${{ matrix.node-version }} 18 | uses: actions/setup-node@v4 19 | with: 20 | node-version: ${{ matrix.node-version }} 21 | cache: 'npm' 22 | - run: npm ci 23 | - run: npm run build --if-present 24 | - run: npm test 25 | -------------------------------------------------------------------------------- /dist/index.d.mts: -------------------------------------------------------------------------------- 1 | import * as hono from 'hono'; 2 | import { Context } from 'hono'; 3 | 4 | interface RateLimitBinding { 5 | limit: LimitFunc; 6 | } 7 | interface LimitFunc { 8 | (options: LimitOptions): Promise; 9 | } 10 | interface RateLimitResult { 11 | success: boolean; 12 | } 13 | interface LimitOptions { 14 | key: string; 15 | } 16 | interface RateLimitResponse { 17 | key: string; 18 | success: boolean; 19 | } 20 | interface RateLimitOptions { 21 | continueOnRateLimit: boolean; 22 | } 23 | type RateLimitKeyFunc = { 24 | (c: Context): string; 25 | }; 26 | declare const rateLimit: (rateLimitBinding: RateLimitBinding, keyFunc: RateLimitKeyFunc) => hono.MiddlewareHandler; 27 | declare const wasRateLimited: (c: Context) => boolean; 28 | 29 | export { type LimitFunc, type LimitOptions, type RateLimitBinding, type RateLimitKeyFunc, type RateLimitOptions, type RateLimitResponse, rateLimit, wasRateLimited }; 30 | -------------------------------------------------------------------------------- /dist/index.d.ts: -------------------------------------------------------------------------------- 1 | import * as hono from 'hono'; 2 | import { Context } from 'hono'; 3 | 4 | interface RateLimitBinding { 5 | limit: LimitFunc; 6 | } 7 | interface LimitFunc { 8 | (options: LimitOptions): Promise; 9 | } 10 | interface RateLimitResult { 11 | success: boolean; 12 | } 13 | interface LimitOptions { 14 | key: string; 15 | } 16 | interface RateLimitResponse { 17 | key: string; 18 | success: boolean; 19 | } 20 | interface RateLimitOptions { 21 | continueOnRateLimit: boolean; 22 | } 23 | type RateLimitKeyFunc = { 24 | (c: Context): string; 25 | }; 26 | declare const rateLimit: (rateLimitBinding: RateLimitBinding, keyFunc: RateLimitKeyFunc) => hono.MiddlewareHandler; 27 | declare const wasRateLimited: (c: Context) => boolean; 28 | 29 | export { type LimitFunc, type LimitOptions, type RateLimitBinding, type RateLimitKeyFunc, type RateLimitOptions, type RateLimitResponse, rateLimit, wasRateLimited }; 30 | -------------------------------------------------------------------------------- /dist/index.mjs: -------------------------------------------------------------------------------- 1 | import { createMiddleware } from 'hono/factory'; 2 | import { HTTPException } from 'hono/http-exception'; 3 | 4 | const RATE_LIMIT_CONTEXT_KEY = ".rateLimited"; 5 | const STATUS_TOO_MANY_REQUESTS = 429; 6 | const rateLimit = (rateLimitBinding, keyFunc) => { 7 | return createMiddleware(async (c, next) => { 8 | let key = keyFunc(c); 9 | if (!key) { 10 | console.warn("the provided keyFunc returned an empty rate limiting key: bypassing rate limits"); 11 | } 12 | if (key) { 13 | let { success } = await rateLimitBinding.limit({ key }); 14 | c.set(RATE_LIMIT_CONTEXT_KEY, success); 15 | if (!success) { 16 | throw new HTTPException(STATUS_TOO_MANY_REQUESTS, { 17 | res: c.text("rate limited", { status: STATUS_TOO_MANY_REQUESTS }) 18 | }); 19 | } 20 | } 21 | await next(); 22 | }); 23 | }; 24 | const wasRateLimited = (c) => { 25 | return c.get(RATE_LIMIT_CONTEXT_KEY); 26 | }; 27 | 28 | export { rateLimit, wasRateLimited }; 29 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "@elithrar/workers-hono-rate-limit", 3 | "version": "0.4.3", 4 | "description": "Hono-compatible middleware for rate limiting requests with Cloudflare Workers.", 5 | "scripts": { 6 | "test": "vitest --run", 7 | "build": "npx unbuild", 8 | "publish": "npx unbuild" 9 | }, 10 | "exports": { 11 | ".": { 12 | "import": "./dist/index.mjs", 13 | "require": "./dist/index.cjs" 14 | } 15 | }, 16 | "main": "dist/index.cjs", 17 | "module": "dist/index.mjs", 18 | "types": "dist/index.d.ts", 19 | "files": [ 20 | "dist" 21 | ], 22 | "license": "Apache-2.0", 23 | "publishConfig": { 24 | "registry": "https://registry.npmjs.org", 25 | "access": "public" 26 | }, 27 | "repository": { 28 | "type": "git", 29 | "url": "git+https://github.com/elithrar/hono-cf-rate-limit.git" 30 | }, 31 | "homepage": "https://github.com/elithrar/hono-cf-rate-limit", 32 | "peerDependencies": { 33 | "hono": "*" 34 | }, 35 | "devDependencies": { 36 | "@types/jest": "^29.5.12", 37 | "hono": "^3.12.12", 38 | "unbuild": "^2.0.0", 39 | "vitest": "^1.0.4" 40 | }, 41 | "dependencies": { 42 | "@cloudflare/workers-types": "^4.20240405.0", 43 | "jest": "^29.7.0" 44 | } 45 | } 46 | -------------------------------------------------------------------------------- /src/index.test.ts: -------------------------------------------------------------------------------- 1 | import { Hono, Context, MiddlewareHandler } from "hono"; 2 | import { RateLimitBinding, RateLimitKeyFunc, rateLimit } from "."; 3 | 4 | type keyConfig = { 5 | key: string; 6 | }; 7 | 8 | class PassingRateLimiter implements RateLimitBinding { 9 | async limit(_: keyConfig) { 10 | return { success: true }; 11 | } 12 | } 13 | 14 | class FailingRateLimiter implements RateLimitBinding { 15 | async limit(_: keyConfig) { 16 | return { success: false }; 17 | } 18 | } 19 | 20 | const passingRateLimiter: MiddlewareHandler = async (c, next) => { 21 | return await rateLimit(new PassingRateLimiter(), () => { 22 | return "someKey"; 23 | })(c, next); 24 | }; 25 | 26 | const failingRateLimiter: MiddlewareHandler = async (c, next) => { 27 | return await rateLimit(new FailingRateLimiter(), () => { 28 | return "someKey"; 29 | })(c, next); 30 | }; 31 | 32 | describe("rate limiting works as expected", () => { 33 | const app = new Hono(); 34 | 35 | app.use("/passing/*", passingRateLimiter); 36 | app.get("/passing/hello", (c) => c.text(`${c.req.url}`)); 37 | 38 | app.use("/failing/*", failingRateLimiter); 39 | app.get("/failing/hello", (c) => c.text(`${c.req.url}`)); 40 | 41 | it("should not be rate limited", async () => { 42 | const res = await app.request("http://localhost/passing/hello"); 43 | expect(res).not.toBeNull(); 44 | expect(res.status).toBe(200); 45 | }); 46 | 47 | it("should be rate limited", async () => { 48 | const res = await app.request("http://localhost/failing/hello"); 49 | expect(res).not.toBeNull(); 50 | expect(res.status).toBe(429); 51 | }); 52 | }); 53 | -------------------------------------------------------------------------------- /src/index.ts: -------------------------------------------------------------------------------- 1 | import { createMiddleware } from "hono/factory"; 2 | import type { Context, Next } from "hono"; 3 | import { HTTPException } from "hono/http-exception"; 4 | 5 | const RATE_LIMIT_CONTEXT_KEY = ".rateLimited"; 6 | const STATUS_TOO_MANY_REQUESTS = 429; 7 | 8 | export interface RateLimitBinding { 9 | limit: LimitFunc; 10 | } 11 | 12 | export interface LimitFunc { 13 | (options: LimitOptions): Promise; 14 | } 15 | 16 | interface RateLimitResult { 17 | success: boolean; 18 | } 19 | 20 | export interface LimitOptions { 21 | key: string; 22 | } 23 | 24 | export interface RateLimitResponse { 25 | key: string; 26 | success: boolean; 27 | } 28 | 29 | export interface RateLimitOptions { 30 | continueOnRateLimit: boolean; 31 | } 32 | 33 | export type RateLimitKeyFunc = { 34 | (c: Context): string; 35 | }; 36 | 37 | export const rateLimit = (rateLimitBinding: RateLimitBinding, keyFunc: RateLimitKeyFunc) => { 38 | return createMiddleware(async (c: Context, next: Next) => { 39 | let key = keyFunc(c); 40 | if (!key) { 41 | console.warn("the provided keyFunc returned an empty rate limiting key: bypassing rate limits"); 42 | } 43 | if (key) { 44 | let { success } = await rateLimitBinding.limit({ key: key }); 45 | c.set(RATE_LIMIT_CONTEXT_KEY, success); 46 | 47 | if (!success) { 48 | throw new HTTPException(STATUS_TOO_MANY_REQUESTS, { 49 | res: c.text("rate limited", { status: STATUS_TOO_MANY_REQUESTS }), 50 | }); 51 | } 52 | } 53 | 54 | // Call the next handler/middleware in the stack on success 55 | await next(); 56 | }); 57 | }; 58 | 59 | export const wasRateLimited = (c: Context): boolean => { 60 | return c.get(RATE_LIMIT_CONTEXT_KEY) as boolean; 61 | }; 62 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Logs 2 | logs 3 | *.log 4 | npm-debug.log* 5 | yarn-debug.log* 6 | yarn-error.log* 7 | lerna-debug.log* 8 | .pnpm-debug.log* 9 | 10 | # Diagnostic reports (https://nodejs.org/api/report.html) 11 | report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json 12 | 13 | # Runtime data 14 | pids 15 | *.pid 16 | *.seed 17 | *.pid.lock 18 | 19 | # Directory for instrumented libs generated by jscoverage/JSCover 20 | lib-cov 21 | 22 | # Coverage directory used by tools like istanbul 23 | coverage 24 | *.lcov 25 | 26 | # nyc test coverage 27 | .nyc_output 28 | 29 | # Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files) 30 | .grunt 31 | 32 | # Bower dependency directory (https://bower.io/) 33 | bower_components 34 | 35 | # node-waf configuration 36 | .lock-wscript 37 | 38 | # Compiled binary addons (https://nodejs.org/api/addons.html) 39 | build/Release 40 | 41 | # Dependency directories 42 | node_modules/ 43 | jspm_packages/ 44 | 45 | # Snowpack dependency directory (https://snowpack.dev/) 46 | web_modules/ 47 | 48 | # TypeScript cache 49 | *.tsbuildinfo 50 | 51 | # Optional npm cache directory 52 | .npm 53 | 54 | # Optional eslint cache 55 | .eslintcache 56 | 57 | # Optional stylelint cache 58 | .stylelintcache 59 | 60 | # Microbundle cache 61 | .rpt2_cache/ 62 | .rts2_cache_cjs/ 63 | .rts2_cache_es/ 64 | .rts2_cache_umd/ 65 | 66 | # Optional REPL history 67 | .node_repl_history 68 | 69 | # Output of 'npm pack' 70 | *.tgz 71 | 72 | # Yarn Integrity file 73 | .yarn-integrity 74 | 75 | # dotenv environment variable files 76 | .env 77 | .env.development.local 78 | .env.test.local 79 | .env.production.local 80 | .env.local 81 | 82 | # parcel-bundler cache (https://parceljs.org/) 83 | .cache 84 | .parcel-cache 85 | 86 | # Next.js build output 87 | .next 88 | out 89 | 90 | # Nuxt.js build / generate output 91 | .nuxt 92 | dist 93 | 94 | # Gatsby files 95 | .cache/ 96 | # Comment in the public line in if your project uses Gatsby and not Next.js 97 | # https://nextjs.org/blog/next-9-1#public-directory-support 98 | # public 99 | 100 | # vuepress build output 101 | .vuepress/dist 102 | 103 | # vuepress v2.x temp and cache directory 104 | .temp 105 | .cache 106 | 107 | # Docusaurus cache and generated files 108 | .docusaurus 109 | 110 | # Serverless directories 111 | .serverless/ 112 | 113 | # FuseBox cache 114 | .fusebox/ 115 | 116 | # DynamoDB Local files 117 | .dynamodb/ 118 | 119 | # TernJS port file 120 | .tern-port 121 | 122 | # Stores VSCode versions used for testing VSCode extensions 123 | .vscode-test 124 | 125 | # yarn v2 126 | .yarn/cache 127 | .yarn/unplugged 128 | .yarn/build-state.yml 129 | .yarn/install-state.gz 130 | .pnp.* 131 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # @elithrar/workers-hono-rate-limit 2 | [![Build & Test](https://github.com/elithrar/workers-hono-rate-limit/actions/workflows/test.yml/badge.svg?branch=main)](https://github.com/elithrar/workers-hono-rate-limit/actions/workflows/test.yml) 3 | 4 | `@elithrar/workers-hono-rate-limit` is Hono middleware that allows you to use Cloudflare Worker's [rate limiting bindings](https://developers.cloudflare.com/workers/runtime-apis/bindings/rate-limit/) directly in your Hono applications. 5 | 6 | ## Install 7 | 8 | To install this into your Hono project: 9 | 10 | ```sh 11 | $ npm install @elithrar/workers-hono-rate-limit 12 | ``` 13 | 14 | ## Usage 15 | 16 | To use the rate limiter middleware: 17 | 18 | 1. Create a [rate limiting binding](#) in your `wrangler.toml` configuration 19 | 2. Define a `RateLimitKeyFunc`: this is a function that returns the key to rate limit on for a given request. A `RateLimitKeyFunc` is simply a function that accepts a Hono `Context` and returns a `string`. 20 | 3. Apply the `rateLimit` middleware to your application or routes. 21 | 22 | The below example shows how to use the `rateLimit` middleware within a Hono app: 23 | 24 | ```toml 25 | # wrangler.toml 26 | 27 | [[unsafe.bindings]] 28 | name = "RATE_LIMITER" 29 | type = "ratelimit" 30 | namespace_id = "1001" 31 | # 20 requests per 10 seconds 32 | simple = { limit = 25, period = 10 } 33 | ``` 34 | 35 | Your corresponding Hono-based Worker would then resemble this: 36 | 37 | ```ts 38 | import { rateLimit, RateLimitBinding, RateLimitKeyFunc } from "@elithrar/workers-hono-rate-limit"; 39 | import { Hono, Context, Next } from "hono"; 40 | 41 | type Bindings = { 42 | RATE_LIMITER: RateLimitBinding; 43 | }; 44 | 45 | const app = new Hono<{ Bindings: Bindings }>(); 46 | 47 | // Your RateLimitKeyFunc returns the key to rate-limit on. 48 | // It has access to everything in the Hono Context, including 49 | // URL path parameters, query parameters, headers, the request body, 50 | // and context values set by other middleware. 51 | const getKey: RateLimitKeyFunc = (c: Context): string => { 52 | // Rate limit on each API token by returning it as the key for our 53 | // middleware to use. 54 | return c.req.header("Authorization") || ""; 55 | }; 56 | 57 | // Create an instance of our rate limiter, passing it the Rate Limiting bindings 58 | const rateLimiter = async (c: Context, next: Next) => { 59 | return await rateLimit(c.env.RATE_LIMITER, getKey)(c, next); 60 | }; 61 | 62 | // Rate limit all routes across our application 63 | app.use("*", rateLimiter); 64 | app.get("/", (c) => { 65 | return c.text("hello!"); 66 | }); 67 | 68 | export default app; 69 | ``` 70 | 71 | You can create multiple `rateLimit` instances, passing in different rate-limiting configurations and a `RateLimitKeyFunc` for each use-case, or apply the same `rateLimit` function to multiple route patterns via `app.use`. 72 | 73 | For example, you might more aggressively rate-limit requests to an `/admin` endpoint and rate limit on the email address provided the `POST` request body vs. a higher, more permissive rate-limit for public routes. 74 | 75 | ## Notes 76 | 77 | - The `keyFunc` that determines what to limit a request on should represent a unique characteristic of a user or class of user that you wish to rate limit. Good choices include API keys in `Authorization` headers, URL paths or routes, specific query parameters used by your application, and/or user IDs. 78 | - It is not recommended to use IP addresses (since these can be shared by many users in many valid cases) or locations (the same), as you may find yourself unintentionally rate limiting a wider group of users than you intended. 79 | - If your provided `keyFunc` does not return a key and instead returns an empty string, the `rateLimit` middleware will not be invoked for the current request. 80 | 81 | ## License 82 | 83 | Apache 2.0 licensed. See the LICENSE file for details. 84 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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