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response.ts
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response.ts
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import type { OutgoingMessage } from 'http'
import { createError } from '../error'
import type { CompatibilityEvent } from '../types'
import { MIMES } from './consts'
const defer = typeof setImmediate !== 'undefined' ? setImmediate : (fn: Function) => fn()
export function send (event: CompatibilityEvent, 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: CompatibilityEvent, type?: string) {
if (type && !event.res.getHeader('Content-Type')) {
event.res.setHeader('Content-Type', type)
}
}
export function sendRedirect (event: CompatibilityEvent, 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: CompatibilityEvent): ReturnType<CompatibilityEvent['res']['getHeaders']> {
return event.res.getHeaders()
}
export function getResponseHeader (event: CompatibilityEvent, name: string): ReturnType<CompatibilityEvent['res']['getHeader']> {
return event.res.getHeader(name)
}
export function setResponseHeaders (event: CompatibilityEvent, 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: CompatibilityEvent, name: string, value: Parameters<OutgoingMessage['setHeader']>[1]): void {
event.res.setHeader(name, value)
}
export const setHeader = setResponseHeader
export function appendResponseHeaders (event: CompatibilityEvent, headers: Record<string, string>): void {
Object.entries(headers).forEach(([name, value]) => appendResponseHeader(event, name, value))
}
export const appendHeaders = appendResponseHeaders
export function appendResponseHeader (event: CompatibilityEvent, 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: CompatibilityEvent, 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)))
})
}