74 lines
1.9 KiB
TypeScript
74 lines
1.9 KiB
TypeScript
import { IncomingMessage, ServerResponse } from 'http'
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import { isResSent } from '../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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export function sendPayload(
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req: IncomingMessage,
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res: ServerResponse,
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payload: any,
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type: 'html' | 'json',
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{
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generateEtags,
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poweredByHeader,
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}: { generateEtags: boolean; poweredByHeader: boolean },
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options?:
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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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): 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 etag = generateEtags ? generateETag(payload) : undefined
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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
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}
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if (etag) {
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res.setHeader('ETag', etag)
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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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res.setHeader('Content-Length', Buffer.byteLength(payload))
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if (options != null) {
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if (options.private || options.stateful) {
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if (options.private || !res.hasHeader('Cache-Control')) {
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res.setHeader(
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'Cache-Control',
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`private, no-cache, no-store, max-age=0, must-revalidate`
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)
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}
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} else if (typeof options.revalidate === 'number') {
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if (options.revalidate < 1) {
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throw new Error(
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`invariant: invalid Cache-Control duration provided: ${options.revalidate} < 1`
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)
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}
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res.setHeader(
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'Cache-Control',
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`s-maxage=${options.revalidate}, stale-while-revalidate`
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)
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} else if (options.revalidate === false) {
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res.setHeader(
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'Cache-Control',
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`s-maxage=31536000, stale-while-revalidate`
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)
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}
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}
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res.end(req.method === 'HEAD' ? null : payload)
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}
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