From b3d44ac5684d8aa2840e1a46b43d25a2da2274e7 Mon Sep 17 00:00:00 2001 From: Laszlo Takacs Date: Mon, 20 Apr 2026 15:58:50 +0200 Subject: [PATCH] Add Koa middleware --- .env.example | 2 + .gitignore | 2 + README.md | 67 +++ index.js | 86 ++++ package-lock.json | 1006 ++++++++++++++++++++++++++++++++++++++++++++ package.json | 33 ++ test/smoke.test.js | 68 +++ 7 files changed, 1264 insertions(+) create mode 100644 .env.example create mode 100644 .gitignore create mode 100644 README.md create mode 100644 index.js create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 test/smoke.test.js diff --git a/.env.example b/.env.example new file mode 100644 index 0000000..07bced2 --- /dev/null +++ b/.env.example @@ -0,0 +1,2 @@ +PRERENDER_TOKEN= +PRERENDER_SERVICE_URL= diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..713d500 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +node_modules/ +.env diff --git a/README.md b/README.md new file mode 100644 index 0000000..a23a6d5 --- /dev/null +++ b/README.md @@ -0,0 +1,67 @@ +# prerender-koa + +Koa middleware for [Prerender.io](https://prerender.io). Intercepts requests from bots and crawlers and serves prerendered HTML, so your JavaScript-rendered app is fully indexable by search engines and social media scrapers. + +Compatible with **Koa v2+** and **Node.js 18+**. + +## Installation + +```bash +npm install prerender-koa +``` + +## Usage + +```javascript +const Koa = require('koa'); +const prerender = require('prerender-koa'); + +const app = new Koa(); + +app.use(prerender({ + token: 'YOUR_PRERENDER_TOKEN' +})); + +// your other middleware and routes +``` + +The middleware intercepts bot requests and proxies them to Prerender.io, returning prerendered HTML. Regular browser requests pass through unaffected. All responses include an `X-Prerender: true/false` header. + +## Options + +| Option | Type | Default | Description | +|--------|------|---------|-------------| +| `token` | `string` | `process.env.PRERENDER_TOKEN` | Your Prerender.io token | +| `serviceUrl` | `string` | `process.env.PRERENDER_SERVICE_URL` or `https://service.prerender.io/` | Prerender service URL (use this for self-hosted Prerender) | +| `protocol` | `string` | `null` | Force a protocol (`http` or `https`). Defaults to the request's protocol | + +## Environment variables + +```bash +PRERENDER_TOKEN=your_token_here +PRERENDER_SERVICE_URL=https://service.prerender.io/ # optional +``` + +## Self-hosted Prerender + +```javascript +app.use(prerender({ + serviceUrl: 'http://your-prerender-server:3000' +})); +``` + +## How it works + +Requests are prerendered when **all** of the following are true: + +- The HTTP method is `GET` +- The `User-Agent` matches a known bot/crawler (Googlebot, Bingbot, Twitterbot, GPTBot, ClaudeBot, etc.) + — OR the URL contains `_escaped_fragment_` + — OR the `X-Bufferbot` header is present +- The URL does not end with a static asset extension (`.js`, `.css`, `.png`, etc.) + +Everything else passes through to your normal Koa middleware. + +## License + +MIT diff --git a/index.js b/index.js new file mode 100644 index 0000000..066704f --- /dev/null +++ b/index.js @@ -0,0 +1,86 @@ +'use strict'; + +const internals = {}; + +internals.crawlerUserAgents = [ + 'googlebot', 'yahoo', 'bingbot', 'baiduspider', + 'facebookexternalhit', 'twitterbot', 'rogerbot', 'linkedinbot', + 'embedly', 'quora link preview', 'showyoubot', 'outbrain', + 'pinterest', 'slackbot', 'developers.google.com/+/web/snippet', + 'w3c_validator', 'perplexity', 'oai-searchbot', 'chatgpt-user', + 'gptbot', 'claudebot', 'amazonbot' +]; + +internals.extensionsToIgnore = [ + '.js', '.css', '.xml', '.less', '.png', '.jpg', '.jpeg', '.gif', + '.pdf', '.doc', '.txt', '.ico', '.rss', '.zip', '.mp3', '.rar', + '.exe', '.wmv', '.avi', '.ppt', '.mpg', '.mpeg', '.tif', '.wav', + '.mov', '.psd', '.ai', '.xls', '.mp4', '.m4a', '.swf', '.dat', + '.dmg', '.iso', '.flv', '.m4v', '.torrent', '.ttf', '.woff', '.svg' +]; + +internals.defaults = { + serviceUrl: process.env.PRERENDER_SERVICE_URL || 'https://service.prerender.io/', + token: process.env.PRERENDER_TOKEN || null, + protocol: null +}; + +function isBot(userAgent) { + const ua = userAgent.toLowerCase(); + return internals.crawlerUserAgents.some((bot) => ua.includes(bot)); +} + +function isStaticAsset(path) { + return internals.extensionsToIgnore.some((ext) => path.endsWith(ext)); +} + +function shouldPrerender(ctx) { + const userAgent = ctx.get('user-agent'); + if (!userAgent || ctx.method !== 'GET') return false; + if (isStaticAsset(ctx.path)) return false; + + return '_escaped_fragment_' in ctx.query + || isBot(userAgent) + || !!ctx.get('x-bufferbot'); +} + +function buildApiUrl(ctx, settings) { + const protocol = settings.protocol || ctx.protocol; + const base = settings.serviceUrl.endsWith('/') + ? settings.serviceUrl + : settings.serviceUrl + '/'; + return `${base}${protocol}://${ctx.host}${ctx.url}`; +} + +async function fetchPrerendered(apiUrl, ctx, settings) { + const headers = { 'User-Agent': ctx.get('user-agent') }; + if (settings.token) { + headers['X-Prerender-Token'] = settings.token; + } + const response = await fetch(apiUrl, { headers, redirect: 'manual' }); + const body = await response.text(); + return { status: response.status, body }; +} + +module.exports = function prerenderMiddleware(options = {}) { + const settings = { ...internals.defaults, ...options }; + + return async function prerender(ctx, next) { + if (!shouldPrerender(ctx)) { + ctx.set('X-Prerender', 'false'); + return next(); + } + + try { + const apiUrl = buildApiUrl(ctx, settings); + const prerendered = await fetchPrerendered(apiUrl, ctx, settings); + ctx.status = prerendered.status; + ctx.body = prerendered.body; + ctx.set('X-Prerender', 'true'); + } catch (err) { + console.error('Prerender error, falling back:', err.message); + ctx.set('X-Prerender', 'false'); + return next(); + } + }; +}; diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..968fbff --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1006 @@ +{ + "name": "prerender-koa", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "prerender-koa", + 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"license": "ISC" + } + } +} diff --git a/package.json b/package.json new file mode 100644 index 0000000..9fc8cdb --- /dev/null +++ b/package.json @@ -0,0 +1,33 @@ +{ + "name": "prerender-koa", + "version": "1.0.0", + "description": "Koa middleware for prerendering JavaScript-rendered pages for SEO via Prerender.io", + "author": "Prerender.io", + "license": "MIT", + "main": "index.js", + "engines": { + "node": ">=18.0.0" + }, + "keywords": [ + "koa", + "prerender", + "prerender.io", + "seo", + "middleware" + ], + "repository": { + "type": "git", + "url": "git://github.com/prerender/integrations", + "directory": "prerender-koa" + }, + "peerDependencies": { + "koa": ">=2.0.0" + }, + "devDependencies": { + "koa": "^3.2.0", + "supertest": "^7.0.0" + }, + "scripts": { + "test": "node --test" + } +} diff --git a/test/smoke.test.js b/test/smoke.test.js new file mode 100644 index 0000000..48b3adc --- /dev/null +++ b/test/smoke.test.js @@ -0,0 +1,68 @@ +'use strict'; + +const { test } = require('node:test'); +const assert = require('node:assert/strict'); +const Koa = require('koa'); +const request = require('supertest'); +const prerender = require('../index'); + +const BOT_UA = 'Mozilla/5.0 (compatible; Googlebot/2.1)'; +const BROWSER_UA = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36'; +const PRERENDERED_HTML = 'prerendered'; + +function mockFetch(body = PRERENDERED_HTML, status = 200) { + global.fetch = async () => ({ + status, + text: async () => body + }); +} + +function createApp(options = {}) { + const app = new Koa(); + app.use(prerender(options)); + app.use((ctx) => { ctx.body = 'original'; }); + return app; +} + +test('normal browser passes through', async () => { + const app = createApp({ token: 'test-token' }); + const res = await request(app.callback()).get('/').set('User-Agent', BROWSER_UA); + assert.equal(res.status, 200); + assert.equal(res.text, 'original'); + assert.equal(res.headers['x-prerender'], 'false'); +}); + +test('bot receives prerendered response', async () => { + mockFetch(); + const app = createApp({ token: 'test-token' }); + const res = await request(app.callback()).get('/').set('User-Agent', BOT_UA); + assert.equal(res.status, 200); + assert.equal(res.text, PRERENDERED_HTML); + assert.equal(res.headers['x-prerender'], 'true'); +}); + +test('static asset with bot UA is not prerendered', async () => { + const app = createApp(); + const res = await request(app.callback()).get('/style.css').set('User-Agent', BOT_UA); + assert.equal(res.status, 200); + assert.equal(res.text, 'original'); + assert.equal(res.headers['x-prerender'], 'false'); +}); + +test('_escaped_fragment_ triggers prerender for any user agent', async () => { + mockFetch(); + const app = createApp({ token: 'test-token' }); + const res = await request(app.callback()).get('/?_escaped_fragment_=').set('User-Agent', BROWSER_UA); + assert.equal(res.status, 200); + assert.equal(res.text, PRERENDERED_HTML); + assert.equal(res.headers['x-prerender'], 'true'); +}); + +test('fetch error falls back to normal response', async () => { + global.fetch = async () => { throw new Error('network error'); }; + const app = createApp({ token: 'test-token' }); + const res = await request(app.callback()).get('/').set('User-Agent', BOT_UA); + assert.equal(res.status, 200); + assert.equal(res.text, 'original'); + assert.equal(res.headers['x-prerender'], 'false'); +});