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response.ts
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response.ts
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import type { OutgoingMessage, ServerResponse } from 'http'
import { createError } from '../error'
import type { H3Event } from '../event'
import { MIMES } from './consts'
const defer = typeof setImmediate !== 'undefined' ? setImmediate : (fn: Function) => fn()
export function send (event: H3Event, data?: any, type?: string): Promise<void> {
if (type) {
defaultContentType(event, type)
}
return new Promise((resolve) => {
defer(() => {
event.res.end(data)
resolve(undefined)
})
})
}
export function defaultContentType (event: H3Event, type?: string) {
if (type && !event.res.getHeader('Content-Type')) {
event.res.setHeader('Content-Type', type)
}
}
export function sendRedirect (event: H3Event, location: string, code = 302) {
event.res.statusCode = code
event.res.setHeader('Location', location)
const encodedLoc = location.replace(/"/g, '%22')
const html = `<!DOCTYPE html><html><head><meta http-equiv="refresh" content="0; url=${encodedLoc}"></head></html>`
return send(event, html, MIMES.html)
}
export function getResponseHeaders (event: H3Event): ReturnType<H3Event['res']['getHeaders']> {
return event.res.getHeaders()
}
export function getResponseHeader (event: H3Event, name: string): ReturnType<H3Event['res']['getHeader']> {
return event.res.getHeader(name)
}
export function setResponseHeaders (event: H3Event, headers: Record<string, Parameters<OutgoingMessage['setHeader']>[1]>): void {
Object.entries(headers).forEach(([name, value]) => event.res.setHeader(name, value))
}
export const setHeaders = setResponseHeaders
export function setResponseHeader (event: H3Event, name: string, value: Parameters<OutgoingMessage['setHeader']>[1]): void {
event.res.setHeader(name, value)
}
export const setHeader = setResponseHeader
export function appendResponseHeaders (event: H3Event, headers: Record<string, string>): void {
Object.entries(headers).forEach(([name, value]) => appendResponseHeader(event, name, value))
}
export const appendHeaders = appendResponseHeaders
export function appendResponseHeader (event: H3Event, name: string, value: string): void {
let current = event.res.getHeader(name)
if (!current) {
event.res.setHeader(name, value)
return
}
if (!Array.isArray(current)) {
current = [current.toString()]
}
event.res.setHeader(name, current.concat(value))
}
export const appendHeader = appendResponseHeader
export function isStream (data: any) {
return data && typeof data === 'object' && typeof data.pipe === 'function' && typeof data.on === 'function'
}
export function sendStream (event: H3Event, data: any): Promise<void> {
return new Promise((resolve, reject) => {
data.pipe(event.res)
data.on('end', () => resolve(undefined))
data.on('error', (error: Error) => reject(createError(error)))
})
}
const noop = () => {}
export function writeEarlyHints (event: H3Event, hints: string | string[] | Record<string, string | string[]>, cb: () => void = noop) {
if (!event.res.socket && !('writeEarlyHints' in event.res)) {
cb()
return
}
// Normalize if string or string[] is provided
if (typeof hints === 'string' || Array.isArray(hints)) {
hints = { link: hints }
}
if (hints.link) {
hints.link = Array.isArray(hints.link) ? hints.link : hints.link.split(',')
// TODO: remove when https://github.com/nodejs/node/pull/44874 is released
hints.link = hints.link.map(l => l.trim().replace(/; crossorigin/g, ''))
}
if ('writeEarlyHints' in event.res) {
return event.res.writeEarlyHints(hints, cb)
}
const headers: [string, string | string[]][] = Object.entries(hints).map(e => [e[0].toLowerCase(), e[1]])
if (!headers.length) {
cb()
return
}
let hint = 'HTTP/1.1 103 Early Hints'
if (hints.link) {
hint += `\r\nLink: ${(hints.link as string[]).join('\r\n')}`
}
for (const [header, value] of headers) {
if (header === 'link') { continue }
hint += `\r\n${header}: ${value}`
}
(event.res as ServerResponse).socket!.write(`${hint}\r\n\r\n`, 'utf-8', cb)
}