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d4b85c0
{"version":3,"sources":["../../src/interceptors/fetch/index.ts","../../src/utils/canParseUrl.ts","../../src/interceptors/fetch/utils/createNetworkError.ts","../../src/interceptors/fetch/utils/followRedirect.ts","../../src/interceptors/fetch/utils/brotli-decompress.browser.ts","../../src/interceptors/fetch/utils/decompression.ts"],"sourcesContent":["import { invariant } from 'outvariant'\nimport { DeferredPromise } from '@open-draft/deferred-promise'\nimport { HttpRequestEventMap, IS_PATCHED_MODULE } from '../../glossary'\nimport { Interceptor } from '../../Interceptor'\nimport { RequestController } from '../../RequestController'\nimport { emitAsync } from '../../utils/emitAsync'\nimport { handleRequest } from '../../utils/handleRequest'\nimport { canParseUrl } from '../../utils/canParseUrl'\nimport { createRequestId } from '../../createRequestId'\nimport { createNetworkError } from './utils/createNetworkError'\nimport { followFetchRedirect } from './utils/followRedirect'\nimport { decompressResponse } from './utils/decompression'\nimport { hasConfigurableGlobal } from '../../utils/hasConfigurableGlobal'\nimport { FetchResponse } from '../../utils/fetchUtils'\n\nexport class FetchInterceptor extends Interceptor<HttpRequestEventMap> {\n static symbol = Symbol('fetch')\n\n constructor() {\n super(FetchInterceptor.symbol)\n }\n\n protected checkEnvironment() {\n return hasConfigurableGlobal('fetch')\n }\n\n protected async setup() {\n const pureFetch = globalThis.fetch\n\n invariant(\n !(pureFetch as any)[IS_PATCHED_MODULE],\n 'Failed to patch the \"fetch\" module: already patched.'\n )\n\n globalThis.fetch = async (input, init) => {\n const requestId = createRequestId()\n\n /**\n * @note Resolve potentially relative request URL\n * against the present `location`. This is mainly\n * for native `fetch` in JSDOM.\n * @see https://github.com/mswjs/msw/issues/1625\n */\n const resolvedInput =\n typeof input === 'string' &&\n typeof location !== 'undefined' &&\n !canParseUrl(input)\n ? new URL(input, location.origin)\n : input\n\n const request = new Request(resolvedInput, init)\n const responsePromise = new DeferredPromise<Response>()\n const controller = new RequestController(request)\n\n this.logger.info('[%s] %s', request.method, request.url)\n this.logger.info('awaiting for the mocked response...')\n\n this.logger.info(\n 'emitting the \"request\" event for %s listener(s)...',\n this.emitter.listenerCount('request')\n )\n\n const isRequestHandled = await handleRequest({\n request,\n requestId,\n emitter: this.emitter,\n controller,\n onResponse: async (rawResponse) => {\n this.logger.info('received mocked response!', {\n rawResponse,\n })\n\n // Decompress the mocked response body, if applicable.\n const decompressedStream = decompressResponse(rawResponse)\n const response =\n decompressedStream === null\n ? rawResponse\n : new FetchResponse(decompressedStream, rawResponse)\n\n FetchResponse.setUrl(request.url, response)\n\n /**\n * Undici's handling of following redirect responses.\n * Treat the \"manual\" redirect mode as a regular mocked response.\n * This way, the client can manually follow the redirect it receives.\n * @see https://github.com/nodejs/undici/blob/a6dac3149c505b58d2e6d068b97f4dc993da55f0/lib/web/fetch/index.js#L1173\n */\n if (FetchResponse.isRedirectResponse(response.status)) {\n // Reject the request promise if its `redirect` is set to `error`\n // and it receives a mocked redirect response.\n if (request.redirect === 'error') {\n responsePromise.reject(createNetworkError('unexpected redirect'))\n return\n }\n\n if (request.redirect === 'follow') {\n followFetchRedirect(request, response).then(\n (response) => {\n responsePromise.resolve(response)\n },\n (reason) => {\n responsePromise.reject(reason)\n }\n )\n return\n }\n }\n\n if (this.emitter.listenerCount('response') > 0) {\n this.logger.info('emitting the \"response\" event...')\n\n // Await the response listeners to finish before resolving\n // the response promise. This ensures all your logic finishes\n // before the interceptor resolves the pending response.\n await emitAsync(this.emitter, 'response', {\n // Clone the mocked response for the \"response\" event listener.\n // This way, the listener can read the response and not lock its body\n // for the actual fetch consumer.\n response: response.clone(),\n isMockedResponse: true,\n request,\n requestId,\n })\n }\n\n responsePromise.resolve(response)\n },\n onRequestError: (response) => {\n this.logger.info('request has errored!', { response })\n responsePromise.reject(createNetworkError(response))\n },\n onError: (error) => {\n this.logger.info('request has been aborted!', { error })\n responsePromise.reject(error)\n },\n })\n\n if (isRequestHandled) {\n this.logger.info('request has been handled, returning mock promise...')\n return responsePromise\n }\n\n this.logger.info(\n 'no mocked response received, performing request as-is...'\n )\n\n return pureFetch(request).then(async (response) => {\n this.logger.info('original fetch performed', response)\n\n if (this.emitter.listenerCount('response') > 0) {\n this.logger.info('emitting the \"response\" event...')\n\n const responseClone = response.clone()\n\n await emitAsync(this.emitter, 'response', {\n response: responseClone,\n isMockedResponse: false,\n request,\n requestId,\n })\n }\n\n return response\n })\n }\n\n Object.defineProperty(globalThis.fetch, IS_PATCHED_MODULE, {\n enumerable: true,\n configurable: true,\n value: true,\n })\n\n this.subscriptions.push(() => {\n Object.defineProperty(globalThis.fetch, IS_PATCHED_MODULE, {\n value: undefined,\n })\n\n globalThis.fetch = pureFetch\n\n this.logger.info(\n 'restored native \"globalThis.fetch\"!',\n globalThis.fetch.name\n )\n })\n }\n}\n","/**\n * Returns a boolean indicating whether the given URL string\n * can be parsed into a `URL` instance.\n * A substitute for `URL.canParse()` for Node.js 18.\n */\nexport function canParseUrl(url: string): boolean {\n try {\n new URL(url)\n return true\n } catch (_error) {\n return false\n }\n}\n","export function createNetworkError(cause?: unknown) {\n return Object.assign(new TypeError('Failed to fetch'), {\n cause,\n })\n}\n","import { createNetworkError } from './createNetworkError'\n\nconst REQUEST_BODY_HEADERS = [\n 'content-encoding',\n 'content-language',\n 'content-location',\n 'content-type',\n 'content-length',\n]\n\nconst kRedirectCount = Symbol('kRedirectCount')\n\n/**\n * @see https://github.com/nodejs/undici/blob/a6dac3149c505b58d2e6d068b97f4dc993da55f0/lib/web/fetch/index.js#L1210\n */\nexport async function followFetchRedirect(\n request: Request,\n response: Response\n): Promise<Response> {\n if (response.status !== 303 && request.body != null) {\n return Promise.reject(createNetworkError())\n }\n\n const requestUrl = new URL(request.url)\n\n let locationUrl: URL\n try {\n // If the location is a relative URL, use the request URL as the base URL.\n locationUrl = new URL(response.headers.get('location')!, request.url) \n } catch (error) {\n return Promise.reject(createNetworkError(error))\n }\n\n if (\n !(locationUrl.protocol === 'http:' || locationUrl.protocol === 'https:')\n ) {\n return Promise.reject(\n createNetworkError('URL scheme must be a HTTP(S) scheme')\n )\n }\n\n if (Reflect.get(request, kRedirectCount) > 20) {\n return Promise.reject(createNetworkError('redirect count exceeded'))\n }\n\n Object.defineProperty(request, kRedirectCount, {\n value: (Reflect.get(request, kRedirectCount) || 0) + 1,\n })\n\n if (\n request.mode === 'cors' &&\n (locationUrl.username || locationUrl.password) &&\n !sameOrigin(requestUrl, locationUrl)\n ) {\n return Promise.reject(\n createNetworkError('cross origin not allowed for request mode \"cors\"')\n )\n }\n\n const requestInit: RequestInit = {}\n\n if (\n ([301, 302].includes(response.status) && request.method === 'POST') ||\n (response.status === 303 && !['HEAD', 'GET'].includes(request.method))\n ) {\n requestInit.method = 'GET'\n requestInit.body = null\n\n REQUEST_BODY_HEADERS.forEach((headerName) => {\n request.headers.delete(headerName)\n })\n }\n\n if (!sameOrigin(requestUrl, locationUrl)) {\n request.headers.delete('authorization')\n request.headers.delete('proxy-authorization')\n request.headers.delete('cookie')\n request.headers.delete('host')\n }\n\n /**\n * @note Undici \"safely\" extracts the request body.\n * I suspect we cannot dispatch this request again\n * since its body has been read and the stream is locked.\n */\n\n requestInit.headers = request.headers\n return fetch(new Request(locationUrl, requestInit))\n}\n\n/**\n * @see https://github.com/nodejs/undici/blob/a6dac3149c505b58d2e6d068b97f4dc993da55f0/lib/web/fetch/util.js#L761\n */\nfunction sameOrigin(left: URL, right: URL): boolean {\n if (left.origin === right.origin && left.origin === 'null') {\n return true\n }\n\n if (\n left.protocol === right.protocol &&\n left.hostname === right.hostname &&\n left.port === right.port\n ) {\n return true\n }\n\n return false\n}\n","export class BrotliDecompressionStream extends TransformStream {\n constructor() {\n console.warn(\n '[Interceptors]: Brotli decompression of response streams is not supported in the browser'\n )\n\n super({\n transform(chunk, controller) {\n // Keep the stream as passthrough, it does nothing.\n controller.enqueue(chunk)\n },\n })\n }\n}\n","// Import from an internal alias that resolves to different modules\n// depending on the environment. This way, we can keep the fetch interceptor\n// intact while using different strategies for Brotli decompression.\nimport { BrotliDecompressionStream } from 'internal:brotli-decompress'\n\nclass PipelineStream extends TransformStream {\n constructor(\n transformStreams: Array<TransformStream>,\n ...strategies: Array<QueuingStrategy>\n ) {\n super({}, ...strategies)\n\n const readable = [super.readable as any, ...transformStreams].reduce(\n (readable, transform) => readable.pipeThrough(transform)\n )\n\n Object.defineProperty(this, 'readable', {\n get() {\n return readable\n },\n })\n }\n}\n\nexport function parseContentEncoding(contentEncoding: string): Array<string> {\n return contentEncoding\n .toLowerCase()\n .split(',')\n .map((coding) => coding.trim())\n}\n\nfunction createDecompressionStream(\n contentEncoding: string\n): TransformStream | null {\n if (contentEncoding === '') {\n return null\n }\n\n const codings = parseContentEncoding(contentEncoding)\n\n if (codings.length === 0) {\n return null\n }\n\n const transformers = codings.reduceRight<Array<TransformStream>>(\n (transformers, coding) => {\n if (coding === 'gzip' || coding === 'x-gzip') {\n return transformers.concat(new DecompressionStream('gzip'))\n } else if (coding === 'deflate') {\n return transformers.concat(new DecompressionStream('deflate'))\n } else if (coding === 'br') {\n return transformers.concat(new BrotliDecompressionStream())\n } else {\n transformers.length = 0\n }\n\n return transformers\n },\n []\n )\n\n return new PipelineStream(transformers)\n}\n\nexport function decompressResponse(\n response: Response\n): ReadableStream<any> | null {\n if (response.body === null) {\n return null\n }\n\n const decompressionStream = createDecompressionStream(\n response.headers.get('content-encoding') || ''\n )\n\n if (!decompressionStream) {\n return null\n }\n\n // Use `pipeTo` and return the decompression stream's readable\n // instead of `pipeThrough` because that will lock the original\n // 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