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import type { BaseNextRequest } from '../../../base-http'
import type { NodeNextRequest } from '../../../base-http/node'
import type { WebNextRequest } from '../../../base-http/web'
import type { Writable } from 'node:stream'
import { getRequestMeta } from '../../../request-meta'
import { fromNodeOutgoingHttpHeaders } from '../../utils'
import { NextRequest } from '../request'
import { isNodeNextRequest, isWebNextRequest } from '../../../base-http/helpers'
export const ResponseAbortedName = 'ResponseAborted'
export class ResponseAborted extends Error {
public readonly name = ResponseAbortedName
}
/**
* Creates an AbortController tied to the closing of a ServerResponse (or other
* appropriate Writable).
*
* If the `close` event is fired before the `finish` event, then we'll send the
* `abort` signal.
*/
export function createAbortController(response: Writable): AbortController {
const controller = new AbortController()
// If `finish` fires first, then `res.end()` has been called and the close is
// just us finishing the stream on our side. If `close` fires first, then we
// know the client disconnected before we finished.
response.once('close', () => {
if (response.writableFinished) return
controller.abort(new ResponseAborted())
})
return controller
}
/**
* Creates an AbortSignal tied to the closing of a ServerResponse (or other
* appropriate Writable).
*
* This cannot be done with the request (IncomingMessage or Readable) because
* the `abort` event will not fire if to data has been fully read (because that
* will "close" the readable stream and nothing fires after that).
*/
export function signalFromNodeResponse(response: Writable): AbortSignal {
const { errored, destroyed } = response
if (errored || destroyed) {
return AbortSignal.abort(errored ?? new ResponseAborted())
}
const { signal } = createAbortController(response)
return signal
}
export class NextRequestAdapter {
public static fromBaseNextRequest(
request: BaseNextRequest,
signal: AbortSignal
): NextRequest {
if (
// The type check here ensures that `req` is correctly typed, and the
// environment variable check provides dead code elimination.
process.env.NEXT_RUNTIME === 'edge' &&
isWebNextRequest(request)
) {
return NextRequestAdapter.fromWebNextRequest(request)
} else if (
// The type check here ensures that `req` is correctly typed, and the
// environment variable check provides dead code elimination.
process.env.NEXT_RUNTIME !== 'edge' &&
isNodeNextRequest(request)
) {
return NextRequestAdapter.fromNodeNextRequest(request, signal)
} else {
throw new Error('Invariant: Unsupported NextRequest type')
}
}
public static fromNodeNextRequest(
request: NodeNextRequest,
signal: AbortSignal
): NextRequest {
// HEAD and GET requests can not have a body.
let body: BodyInit | null = null
if (request.method !== 'GET' && request.method !== 'HEAD' && request.body) {
// @ts-expect-error - this is handled by undici, when streams/web land use it instead
body = request.body
}
let url: URL
if (request.url.startsWith('http')) {
url = new URL(request.url)
} else {
// Grab the full URL from the request metadata.
const base = getRequestMeta(request, 'initURL')
if (!base || !base.startsWith('http')) {
// Because the URL construction relies on the fact that the URL provided
// is absolute, we need to provide a base URL. We can't use the request
// URL because it's relative, so we use a dummy URL instead.
url = new URL(request.url, 'http://n')
} else {
url = new URL(request.url, base)
}
}
return new NextRequest(url, {
method: request.method,
headers: fromNodeOutgoingHttpHeaders(request.headers),
duplex: 'half',
signal,
// geo
// ip
// nextConfig
// body can not be passed if request was aborted
// or we get a Request body was disturbed error
...(signal.aborted
? {}
: {
body,
}),
})
}
public static fromWebNextRequest(request: WebNextRequest): NextRequest {
// HEAD and GET requests can not have a body.
let body: ReadableStream | null = null
if (request.method !== 'GET' && request.method !== 'HEAD') {
body = request.body
}
return new NextRequest(request.url, {
method: request.method,
headers: fromNodeOutgoingHttpHeaders(request.headers),
duplex: 'half',
signal: request.request.signal,
// geo
// ip
// nextConfig
// body can not be passed if request was aborted
// or we get a Request body was disturbed error
...(request.request.signal.aborted
? {}
: {
body,
}),
})
}
}
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