c9863c8794
By moving `setRevalidateHeaders` to a separate file we can shake off the dependency of `etag` and a polyfill for `Buffer` from the web server (which brings hundreds of kilobytes). ## Bug - [ ] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Errors have helpful link attached, see `contributing.md` ## Feature - [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR. - [ ] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Documentation added - [ ] Telemetry added. In case of a feature if it's used or not. - [ ] Errors have helpful link attached, see `contributing.md` ## Documentation / Examples - [ ] Make sure the linting passes by running `yarn lint`
96 lines
2.2 KiB
TypeScript
96 lines
2.2 KiB
TypeScript
import type { IncomingMessage, ServerResponse } from 'http'
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import { isResSent } from '../../shared/lib/utils'
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import generateETag from 'next/dist/compiled/etag'
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import fresh from 'next/dist/compiled/fresh'
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import RenderResult from '../render-result'
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import { setRevalidateHeaders } from './revalidate-headers'
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export type PayloadOptions =
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| { private: true }
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| { private: boolean; stateful: true }
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| { private: boolean; stateful: false; revalidate: number | false }
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export { setRevalidateHeaders }
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export async function sendRenderResult({
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req,
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res,
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result,
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type,
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generateEtags,
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poweredByHeader,
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options,
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}: {
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req: IncomingMessage
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res: ServerResponse
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result: RenderResult
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type: 'html' | 'json'
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generateEtags: boolean
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poweredByHeader: boolean
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options?: PayloadOptions
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}): Promise<void> {
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if (isResSent(res)) {
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return
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}
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if (poweredByHeader && type === 'html') {
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res.setHeader('X-Powered-By', 'Next.js')
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}
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const payload = result.isDynamic() ? null : await result.toUnchunkedString()
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if (payload) {
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const etag = generateEtags ? generateETag(payload) : undefined
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if (sendEtagResponse(req, res, etag)) {
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return
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}
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}
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if (!res.getHeader('Content-Type')) {
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res.setHeader(
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'Content-Type',
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type === 'json' ? 'application/json' : 'text/html; charset=utf-8'
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)
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}
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if (payload) {
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res.setHeader('Content-Length', Buffer.byteLength(payload))
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}
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if (options != null) {
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setRevalidateHeaders(res, options)
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}
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if (req.method === 'HEAD') {
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res.end(null)
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} else if (payload) {
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res.end(payload)
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} else {
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await result.pipe(res)
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}
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}
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export function sendEtagResponse(
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req: IncomingMessage,
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res: ServerResponse,
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etag: string | undefined
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): boolean {
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if (etag) {
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/**
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* The server generating a 304 response MUST generate any of the
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* following header fields that would have been sent in a 200 (OK)
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* response to the same request: Cache-Control, Content-Location, Date,
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* ETag, Expires, and Vary. https://tools.ietf.org/html/rfc7232#section-4.1
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*/
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res.setHeader('ETag', etag)
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}
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if (fresh(req.headers, { etag })) {
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res.statusCode = 304
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res.end()
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return true
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}
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return false
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}
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