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@angular/common

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Angular - commonly needed directives and services

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/** * @license * Copyright Google LLC All Rights Reserved. * * Use of this source code is governed by an MIT-style license that can be * found in the LICENSE file at https://angular.io/license */ import { inject, Injectable, NgZone } from '@angular/core'; import { Observable } from 'rxjs'; import { HttpHeaders } from './headers'; import { HttpErrorResponse, HttpEventType, HttpHeaderResponse, HttpResponse, HttpStatusCode, } from './response'; import * as i0 from "@angular/core"; const XSSI_PREFIX = /^\)\]\}',?\n/; const REQUEST_URL_HEADER = `X-Request-URL`; /** * Determine an appropriate URL for the response, by checking either * response url or the X-Request-URL header. */ function getResponseUrl(response) { if (response.url) { return response.url; } // stored as lowercase in the map const xRequestUrl = REQUEST_URL_HEADER.toLocaleLowerCase(); return response.headers.get(xRequestUrl); } /** * Uses `fetch` to send requests to a backend server. * * This `FetchBackend` requires the support of the * [Fetch API](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API) which is available on all * supported browsers and on Node.js v18 or later. * * @see {@link HttpHandler} * * @publicApi */ export class FetchBackend { constructor() { // We need to bind the native fetch to its context or it will throw an "illegal invocation" this.fetchImpl = inject(FetchFactory, { optional: true })?.fetch ?? fetch.bind(globalThis); this.ngZone = inject(NgZone); } handle(request) { return new Observable((observer) => { const aborter = new AbortController(); this.doRequest(request, aborter.signal, observer).then(noop, (error) => observer.error(new HttpErrorResponse({ error }))); return () => aborter.abort(); }); } async doRequest(request, signal, observer) { const init = this.createRequestInit(request); let response; try { const fetchPromise = this.fetchImpl(request.urlWithParams, { signal, ...init }); // Make sure Zone.js doesn't trigger false-positive unhandled promise // error in case the Promise is rejected synchronously. See function // description for additional information. silenceSuperfluousUnhandledPromiseRejection(fetchPromise); // Send the `Sent` event before awaiting the response. observer.next({ type: HttpEventType.Sent }); response = await fetchPromise; } catch (error) { observer.error(new HttpErrorResponse({ error, status: error.status ?? 0, statusText: error.statusText, url: request.urlWithParams, headers: error.headers, })); return; } const headers = new HttpHeaders(response.headers); const statusText = response.statusText; const url = getResponseUrl(response) ?? request.urlWithParams; let status = response.status; let body = null; if (request.reportProgress) { observer.next(new HttpHeaderResponse({ headers, status, statusText, url })); } if (response.body) { // Read Progress const contentLength = response.headers.get('content-length'); const chunks = []; const reader = response.body.getReader(); let receivedLength = 0; let decoder; let partialText; // We have to check whether the Zone is defined in the global scope because this may be called // when the zone is nooped. const reqZone = typeof Zone !== 'undefined' && Zone.current; // Perform response processing outside of Angular zone to // ensure no excessive change detection runs are executed // Here calling the async ReadableStreamDefaultReader.read() is responsible for triggering CD await this.ngZone.runOutsideAngular(async () => { while (true) { const { done, value } = await reader.read(); if (done) { break; } chunks.push(value); receivedLength += value.length; if (request.reportProgress) { partialText = request.responseType === 'text' ? (partialText ?? '') + (decoder ??= new TextDecoder()).decode(value, { stream: true }) : undefined; const reportProgress = () => observer.next({ type: HttpEventType.DownloadProgress, total: contentLength ? +contentLength : undefined, loaded: receivedLength, partialText, }); reqZone ? reqZone.run(reportProgress) : reportProgress(); } } }); // Combine all chunks. const chunksAll = this.concatChunks(chunks, receivedLength); try { const contentType = response.headers.get('Content-Type') ?? ''; body = this.parseBody(request, chunksAll, contentType); } catch (error) { // Body loading or parsing failed observer.error(new HttpErrorResponse({ error, headers: new HttpHeaders(response.headers), status: response.status, statusText: response.statusText, url: getResponseUrl(response) ?? request.urlWithParams, })); return; } } // Same behavior as the XhrBackend if (status === 0) { status = body ? HttpStatusCode.Ok : 0; } // ok determines whether the response will be transmitted on the event or // error channel. Unsuccessful status codes (not 2xx) will always be errors, // but a successful status code can still result in an error if the user // asked for JSON data and the body cannot be parsed as such. const ok = status >= 200 && status < 300; if (ok) { observer.next(new HttpResponse({ body, headers, status, statusText, url, })); // The full body has been received and delivered, no further events // are possible. This request is complete. observer.complete(); } else { observer.error(new HttpErrorResponse({ error: body, headers, status, statusText, url, })); } } parseBody(request, binContent, contentType) { switch (request.responseType) { case 'json': // stripping the XSSI when present const text = new TextDecoder().decode(binContent).replace(XSSI_PREFIX, ''); return text === '' ? null : JSON.parse(text); case 'text': return new TextDecoder().decode(binContent); case 'blob': return new Blob([binContent], { type: contentType }); case 'arraybuffer': return binContent.buffer; } } createRequestInit(req) { // We could share some of this logic with the XhrBackend const headers = {}; const credentials = req.withCredentials ? 'include' : undefined; // Setting all the requested headers. req.headers.forEach((name, values) => (headers[name] = values.join(','))); // Add an Accept header if one isn't present already. headers['Accept'] ??= 'application/json, text/plain, */*'; // Auto-detect the Content-Type header if one isn't present already. if (!headers['Content-Type']) { const detectedType = req.detectContentTypeHeader(); // Sometimes Content-Type detection fails. if (detectedType !== null) { headers['Content-Type'] = detectedType; } } return { body: req.serializeBody(), method: req.method, headers, credentials, }; } concatChunks(chunks, totalLength) { const chunksAll = new Uint8Array(totalLength); let position = 0; for (const chunk of chunks) { chunksAll.set(chunk, position); position += chunk.length; } return chunksAll; } static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.9", ngImport: i0, type: FetchBackend, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); } static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "17.3.9", ngImport: i0, type: FetchBackend }); } } i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.9", ngImport: i0, type: FetchBackend, decorators: [{ type: Injectable }] }); /** * Abstract class to provide a mocked implementation of `fetch()` */ export class FetchFactory { } function noop() { } /** * Zone.js treats a rejected promise that has not yet been awaited * as an unhandled error. This function adds a noop `.then` to make * sure that Zone.js doesn't throw an error if the Promise is rejected * synchronously. */ function silenceSuperfluousUnhandledPromiseRejection(promise) { promise.then(noop, noop); } //# 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REQUEST_URL_HEADER.toLocaleLowerCase();\n  return response.headers.get(xRequestUrl);\n}\n\n/**\n * Uses `fetch` to send requests to a backend server.\n *\n * This `FetchBackend` requires the support of the\n * [Fetch API](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API) which is available on all\n * supported browsers and on Node.js v18 or later.\n *\n * @see {@link HttpHandler}\n *\n * @publicApi\n */\n@Injectable()\nexport class FetchBackend implements HttpBackend {\n  // We need to bind the native fetch to its context or it will throw an \"illegal invocation\"\n  private readonly fetchImpl =\n    inject(FetchFactory, {optional: true})?.fetch ?? fetch.bind(globalThis);\n  private readonly ngZone = inject(NgZone);\n\n  handle(request: HttpRequest<any>): Observable<HttpEvent<any>> {\n    return new Observable((observer) => {\n      const aborter = new AbortController();\n      this.doRequest(request, aborter.signal, observer).then(noop, (error) =>\n        observer.error(new 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See function\n      // description for additional information.\n      silenceSuperfluousUnhandledPromiseRejection(fetchPromise);\n\n      // Send the `Sent` event before awaiting the response.\n      observer.next({type: HttpEventType.Sent});\n\n      response = await fetchPromise;\n    } catch (error: any) {\n      observer.error(\n        new HttpErrorResponse({\n          error,\n          status: error.status ?? 0,\n          statusText: error.statusText,\n          url: request.urlWithParams,\n          headers: error.headers,\n        }),\n      );\n      return;\n    }\n\n    const headers = new HttpHeaders(response.headers);\n    const statusText = response.statusText;\n    const url = getResponseUrl(response) ?? request.urlWithParams;\n\n    let status = response.status;\n    let body: string | ArrayBuffer | Blob | object | null = null;\n\n    if (request.reportProgress) {\n      observer.next(new HttpHeaderResponse({headers, status, statusText, url}));\n    }\n\n    if (response.body) {\n      // Read Progress\n      const contentLength = response.headers.get('content-length');\n      const chunks: Uint8Array[] = [];\n      const reader = response.body.getReader();\n      let receivedLength = 0;\n\n      let decoder: TextDecoder;\n      let partialText: string | undefined;\n\n      // We have to check whether the Zone is defined in the global scope because this may be called\n      // when the zone is nooped.\n      const reqZone = typeof Zone !== 'undefined' && Zone.current;\n\n      // Perform response processing outside of Angular zone to\n      // ensure no excessive change detection runs are executed\n      // Here calling the async ReadableStreamDefaultReader.read() is responsible for triggering CD\n      await this.ngZone.runOutsideAngular(async () => {\n        while (true) {\n          const {done, value} = await reader.read();\n\n          if (done) {\n            break;\n          }\n\n          chunks.push(value);\n          receivedLength += value.length;\n\n          if (request.reportProgress) {\n            partialText =\n              request.responseType === 'text'\n                ? (partialText ?? '') +\n                  (decoder ??= new TextDecoder()).decode(value, {stream: true})\n                : undefined;\n\n            const reportProgress = () =>\n              observer.next({\n                type: HttpEventType.DownloadProgress,\n                total: contentLength ? +contentLength : undefined,\n                loaded: receivedLength,\n                partialText,\n              } as HttpDownloadProgressEvent);\n            reqZone ? reqZone.run(reportProgress) : reportProgress();\n          }\n        }\n      });\n\n      // Combine all chunks.\n      const chunksAll = this.concatChunks(chunks, receivedLength);\n      try {\n        const contentType = response.headers.get('Content-Type') ?? '';\n        body = this.parseBody(request, chunksAll, contentType);\n      } catch (error) {\n        // Body loading or parsing failed\n        observer.error(\n          new HttpErrorResponse({\n            error,\n            headers: new HttpHeaders(response.headers),\n            status: response.status,\n            statusText: response.statusText,\n            url: getResponseUrl(response) ?? request.urlWithParams,\n          }),\n        );\n        return;\n      }\n    }\n\n    // Same behavior as the XhrBackend\n    if (status === 0) {\n      status = body ? HttpStatusCode.Ok : 0;\n    }\n\n    // ok determines whether the response will be transmitted on the event or\n    // error channel. Unsuccessful status codes (not 2xx) will always be errors,\n    // but a successful status code can still result in an error if the user\n    // asked for JSON data and the body cannot be parsed as such.\n    const ok = status >= 200 && status < 300;\n\n    if (ok) {\n      observer.next(\n        new HttpResponse({\n          body,\n          headers,\n          status,\n          statusText,\n          url,\n        }),\n      );\n\n      // The full body has been received and delivered, no further events\n      // are possible. This request is complete.\n      observer.complete();\n    } else {\n      observer.error(\n        new HttpErrorResponse({\n          error: body,\n          headers,\n          status,\n          statusText,\n          url,\n        }),\n      );\n    }\n  }\n\n  private parseBody(\n    request: HttpRequest<any>,\n    binContent: Uint8Array,\n    contentType: string,\n  ): string | ArrayBuffer | Blob | object | null {\n    switch (request.responseType) {\n      case 'json':\n        // stripping the XSSI when present\n        const text = new TextDecoder().decode(binContent).replace(XSSI_PREFIX, '');\n        return text === '' ? null : (JSON.parse(text) as object);\n      case 'text':\n        return new TextDecoder().decode(binContent);\n      case 'blob':\n        return new Blob([binContent], {type: contentType});\n      case 'arraybuffer':\n        return binContent.buffer;\n    }\n  }\n\n  private createRequestInit(req: HttpRequest<any>): RequestInit {\n    // We could share some of this logic with the XhrBackend\n\n    const headers: Record<string, string> = {};\n    const credentials: RequestCredentials | undefined = req.withCredentials ? 'include' : undefined;\n\n    // Setting all the requested headers.\n    req.headers.forEach((name, values) => (headers[name] = values.join(',')));\n\n    // Add an Accept header if one isn't present already.\n    headers['Accept'] ??= 'application/json, text/plain, */*';\n\n    // Auto-detect the Content-Type header if one isn't present already.\n    if (!headers['Content-Type']) {\n      const detectedType = req.detectContentTypeHeader();\n      // Sometimes Content-Type detection fails.\n      if (detectedType !== null) {\n        headers['Content-Type'] = detectedType;\n      }\n    }\n\n    return {\n      body: req.serializeBody(),\n      method: req.method,\n      headers,\n      credentials,\n    };\n  }\n\n  private concatChunks(chunks: Uint8Array[], totalLength: number): Uint8Array {\n    const chunksAll = new Uint8Array(totalLength);\n    let position = 0;\n    for (const chunk of chunks) {\n      chunksAll.set(chunk, position);\n      position += chunk.length;\n    }\n\n    return chunksAll;\n  }\n}\n\n/**\n * Abstract class to provide a mocked implementation of `fetch()`\n */\nexport abstract class FetchFactory {\n  abstract fetch: typeof fetch;\n}\n\nfunction noop(): void {}\n\n/**\n * Zone.js treats a rejected promise that has not yet been awaited\n * as an unhandled error. This function adds a noop `.then` to make\n * sure that Zone.js doesn't throw an error if the Promise is rejected\n * synchronously.\n */\nfunction silenceSuperfluousUnhandledPromiseRejection(promise: Promise<unknown>) {\n  promise.then(noop, noop);\n}\n"]}