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import { stringifyCookie } from '../../web/spec-extension/cookies'
import type { I18NConfig } from '../../config-shared'
import { NextURL } from '../next-url'
import { toNodeOutgoingHttpHeaders, validateURL } from '../utils'
import { ReflectAdapter } from './adapters/reflect'
import { ResponseCookies } from './cookies'
const INTERNALS = Symbol('internal response')
const REDIRECTS = new Set([301, 302, 303, 307, 308])
function handleMiddlewareField(
init: MiddlewareResponseInit | undefined,
headers: Headers
) {
if (init?.request?.headers) {
if (!(init.request.headers instanceof Headers)) {
throw new Error('request.headers must be an instance of Headers')
}
const keys = []
for (const [key, value] of init.request.headers) {
headers.set('x-middleware-request-' + key, value)
keys.push(key)
}
headers.set('x-middleware-override-headers', keys.join(','))
}
}
/**
* This class extends the [Web `Response` API](https://developer.mozilla.org/docs/Web/API/Response) with additional convenience methods.
*
* Read more: [Next.js Docs: `NextResponse`](https://nextjs.org/docs/app/api-reference/functions/next-response)
*/
export class NextResponse<Body = unknown> extends Response {
[INTERNALS]: {
cookies: ResponseCookies
url?: NextURL
body?: Body
}
constructor(body?: BodyInit | null, init: ResponseInit = {}) {
super(body, init)
const headers = this.headers
const cookies = new ResponseCookies(headers)
const cookiesProxy = new Proxy(cookies, {
get(target, prop, receiver) {
switch (prop) {
case 'delete':
case 'set': {
return (...args: [string, string]) => {
const result = Reflect.apply(target[prop], target, args)
const newHeaders = new Headers(headers)
if (result instanceof ResponseCookies) {
headers.set(
'x-middleware-set-cookie',
result
.getAll()
.map((cookie) => stringifyCookie(cookie))
.join(',')
)
}
handleMiddlewareField(init, newHeaders)
return result
}
}
default:
return ReflectAdapter.get(target, prop, receiver)
}
},
})
this[INTERNALS] = {
cookies: cookiesProxy,
url: init.url
? new NextURL(init.url, {
headers: toNodeOutgoingHttpHeaders(headers),
nextConfig: init.nextConfig,
})
: undefined,
}
}
[Symbol.for('edge-runtime.inspect.custom')]() {
return {
cookies: this.cookies,
url: this.url,
// rest of props come from Response
body: this.body,
bodyUsed: this.bodyUsed,
headers: Object.fromEntries(this.headers),
ok: this.ok,
redirected: this.redirected,
status: this.status,
statusText: this.statusText,
type: this.type,
}
}
public get cookies() {
return this[INTERNALS].cookies
}
static json<JsonBody>(
body: JsonBody,
init?: ResponseInit
): NextResponse<JsonBody> {
const response: Response = Response.json(body, init)
return new NextResponse(response.body, response)
}
static redirect(url: string | NextURL | URL, init?: number | ResponseInit) {
const status = typeof init === 'number' ? init : init?.status ?? 307
if (!REDIRECTS.has(status)) {
throw new RangeError(
'Failed to execute "redirect" on "response": Invalid status code'
)
}
const initObj = typeof init === 'object' ? init : {}
const headers = new Headers(initObj?.headers)
headers.set('Location', validateURL(url))
return new NextResponse(null, {
...initObj,
headers,
status,
})
}
static rewrite(
destination: string | NextURL | URL,
init?: MiddlewareResponseInit
) {
const headers = new Headers(init?.headers)
headers.set('x-middleware-rewrite', validateURL(destination))
handleMiddlewareField(init, headers)
return new NextResponse(null, { ...init, headers })
}
static next(init?: MiddlewareResponseInit) {
const headers = new Headers(init?.headers)
headers.set('x-middleware-next', '1')
handleMiddlewareField(init, headers)
return new NextResponse(null, { ...init, headers })
}
}
interface ResponseInit extends globalThis.ResponseInit {
nextConfig?: {
basePath?: string
i18n?: I18NConfig
trailingSlash?: boolean
}
url?: string
}
interface ModifiedRequest {
/**
* If this is set, the request headers will be overridden with this value.
*/
headers?: Headers
}
interface MiddlewareResponseInit extends globalThis.ResponseInit {
/**
* These fields will override the request from clients.
*/
request?: ModifiedRequest
}
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