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package.esm2022.http.src.interceptor.mjs Maven / Gradle / Ivy

/**
 * @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.dev/license
 */
import { isPlatformServer } from '@angular/common';
import { EnvironmentInjector, inject, Injectable, InjectionToken, PLATFORM_ID, runInInjectionContext, ɵConsole as Console, ɵformatRuntimeError as formatRuntimeError, ɵPendingTasks as PendingTasks, } from '@angular/core';
import { finalize } from 'rxjs/operators';
import { HttpBackend, HttpHandler } from './backend';
import { FetchBackend } from './fetch';
import * as i0 from "@angular/core";
import * as i1 from "./backend";
function interceptorChainEndFn(req, finalHandlerFn) {
    return finalHandlerFn(req);
}
/**
 * Constructs a `ChainedInterceptorFn` which adapts a legacy `HttpInterceptor` to the
 * `ChainedInterceptorFn` interface.
 */
function adaptLegacyInterceptorToChain(chainTailFn, interceptor) {
    return (initialRequest, finalHandlerFn) => interceptor.intercept(initialRequest, {
        handle: (downstreamRequest) => chainTailFn(downstreamRequest, finalHandlerFn),
    });
}
/**
 * Constructs a `ChainedInterceptorFn` which wraps and invokes a functional interceptor in the given
 * injector.
 */
function chainedInterceptorFn(chainTailFn, interceptorFn, injector) {
    return (initialRequest, finalHandlerFn) => runInInjectionContext(injector, () => interceptorFn(initialRequest, (downstreamRequest) => chainTailFn(downstreamRequest, finalHandlerFn)));
}
/**
 * A multi-provider token that represents the array of registered
 * `HttpInterceptor` objects.
 *
 * @publicApi
 */
export const HTTP_INTERCEPTORS = new InjectionToken(ngDevMode ? 'HTTP_INTERCEPTORS' : '');
/**
 * A multi-provided token of `HttpInterceptorFn`s.
 */
export const HTTP_INTERCEPTOR_FNS = new InjectionToken(ngDevMode ? 'HTTP_INTERCEPTOR_FNS' : '');
/**
 * A multi-provided token of `HttpInterceptorFn`s that are only set in root.
 */
export const HTTP_ROOT_INTERCEPTOR_FNS = new InjectionToken(ngDevMode ? 'HTTP_ROOT_INTERCEPTOR_FNS' : '');
// TODO(atscott): We need a larger discussion about stability and what should contribute to stability.
// Should the whole interceptor chain contribute to stability or just the backend request #55075?
// Should HttpClient contribute to stability automatically at all?
export const REQUESTS_CONTRIBUTE_TO_STABILITY = new InjectionToken(ngDevMode ? 'REQUESTS_CONTRIBUTE_TO_STABILITY' : '', { providedIn: 'root', factory: () => true });
/**
 * Creates an `HttpInterceptorFn` which lazily initializes an interceptor chain from the legacy
 * class-based interceptors and runs the request through it.
 */
export function legacyInterceptorFnFactory() {
    let chain = null;
    return (req, handler) => {
        if (chain === null) {
            const interceptors = inject(HTTP_INTERCEPTORS, { optional: true }) ?? [];
            // Note: interceptors are wrapped right-to-left so that final execution order is
            // left-to-right. That is, if `interceptors` is the array `[a, b, c]`, we want to
            // produce a chain that is conceptually `c(b(a(end)))`, which we build from the inside
            // out.
            chain = interceptors.reduceRight(adaptLegacyInterceptorToChain, interceptorChainEndFn);
        }
        const pendingTasks = inject(PendingTasks);
        const contributeToStability = inject(REQUESTS_CONTRIBUTE_TO_STABILITY);
        if (contributeToStability) {
            const taskId = pendingTasks.add();
            return chain(req, handler).pipe(finalize(() => pendingTasks.remove(taskId)));
        }
        else {
            return chain(req, handler);
        }
    };
}
let fetchBackendWarningDisplayed = false;
/** Internal function to reset the flag in tests */
export function resetFetchBackendWarningFlag() {
    fetchBackendWarningDisplayed = false;
}
export class HttpInterceptorHandler extends HttpHandler {
    constructor(backend, injector) {
        super();
        this.backend = backend;
        this.injector = injector;
        this.chain = null;
        this.pendingTasks = inject(PendingTasks);
        this.contributeToStability = inject(REQUESTS_CONTRIBUTE_TO_STABILITY);
        // We strongly recommend using fetch backend for HTTP calls when SSR is used
        // for an application. The logic below checks if that's the case and produces
        // a warning otherwise.
        if ((typeof ngDevMode === 'undefined' || ngDevMode) && !fetchBackendWarningDisplayed) {
            const isServer = isPlatformServer(injector.get(PLATFORM_ID));
            if (isServer && !(this.backend instanceof FetchBackend)) {
                fetchBackendWarningDisplayed = true;
                injector
                    .get(Console)
                    .warn(formatRuntimeError(2801 /* RuntimeErrorCode.NOT_USING_FETCH_BACKEND_IN_SSR */, 'Angular detected that `HttpClient` is not configured ' +
                    "to use `fetch` APIs. It's strongly recommended to " +
                    'enable `fetch` for applications that use Server-Side Rendering ' +
                    'for better performance and compatibility. ' +
                    'To enable `fetch`, add the `withFetch()` to the `provideHttpClient()` ' +
                    'call at the root of the application.'));
            }
        }
    }
    handle(initialRequest) {
        if (this.chain === null) {
            const dedupedInterceptorFns = Array.from(new Set([
                ...this.injector.get(HTTP_INTERCEPTOR_FNS),
                ...this.injector.get(HTTP_ROOT_INTERCEPTOR_FNS, []),
            ]));
            // Note: interceptors are wrapped right-to-left so that final execution order is
            // left-to-right. That is, if `dedupedInterceptorFns` is the array `[a, b, c]`, we want to
            // produce a chain that is conceptually `c(b(a(end)))`, which we build from the inside
            // out.
            this.chain = dedupedInterceptorFns.reduceRight((nextSequencedFn, interceptorFn) => chainedInterceptorFn(nextSequencedFn, interceptorFn, this.injector), interceptorChainEndFn);
        }
        if (this.contributeToStability) {
            const taskId = this.pendingTasks.add();
            return this.chain(initialRequest, (downstreamRequest) => this.backend.handle(downstreamRequest)).pipe(finalize(() => this.pendingTasks.remove(taskId)));
        }
        else {
            return this.chain(initialRequest, (downstreamRequest) => this.backend.handle(downstreamRequest));
        }
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.6", ngImport: i0, type: HttpInterceptorHandler, deps: [{ token: i1.HttpBackend }, { token: i0.EnvironmentInjector }], target: i0.ɵɵFactoryTarget.Injectable }); }
    static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "18.2.6", ngImport: i0, type: HttpInterceptorHandler }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.6", ngImport: i0, type: HttpInterceptorHandler, decorators: [{
            type: Injectable
        }], ctorParameters: () => [{ type: i1.HttpBackend }, { type: i0.EnvironmentInjector }] });
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.dev/license\n */\n\nimport {isPlatformServer} from '@angular/common';\nimport {\n  EnvironmentInjector,\n  inject,\n  Injectable,\n  InjectionToken,\n  PLATFORM_ID,\n  runInInjectionContext,\n  ɵConsole as Console,\n  ɵformatRuntimeError as formatRuntimeError,\n  ɵPendingTasks as PendingTasks,\n} from '@angular/core';\nimport {Observable} from 'rxjs';\nimport {finalize} from 'rxjs/operators';\n\nimport {HttpBackend, HttpHandler} from './backend';\nimport {RuntimeErrorCode} from './errors';\nimport {FetchBackend} from './fetch';\nimport {HttpRequest} from './request';\nimport {HttpEvent} from './response';\n\n/**\n * Intercepts and handles an `HttpRequest` or `HttpResponse`.\n *\n * Most interceptors transform the outgoing request before passing it to the\n * next interceptor in the chain, by calling `next.handle(transformedReq)`.\n * An interceptor may transform the\n * response event stream as well, by applying additional RxJS operators on the stream\n * returned by `next.handle()`.\n *\n * More rarely, an interceptor may handle the request entirely,\n * and compose a new event stream instead of invoking `next.handle()`. This is an\n * acceptable behavior, but keep in mind that further interceptors will be skipped entirely.\n *\n * It is also rare but valid for an interceptor to return multiple responses on the\n * event stream for a single request.\n *\n * @publicApi\n *\n * @see [HTTP Guide](guide/http/interceptors)\n * @see {@link HttpInterceptorFn}\n *\n * @usageNotes\n *\n * To use the same instance of `HttpInterceptors` for the entire app, import the `HttpClientModule`\n * only in your `AppModule`, and add the interceptors to the root application injector.\n * If you import `HttpClientModule` multiple times across different modules (for example, in lazy\n * loading modules), each import creates a new copy of the `HttpClientModule`, which overwrites the\n * interceptors provided in the root module.\n */\nexport interface HttpInterceptor {\n  /**\n   * Identifies and handles a given HTTP request.\n   * @param req The outgoing request object to handle.\n   * @param next The next interceptor in the chain, or the backend\n   * if no interceptors remain in the chain.\n   * @returns An observable of the event stream.\n   */\n  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>;\n}\n\n/**\n * Represents the next interceptor in an interceptor chain, or the real backend if there are no\n * further interceptors.\n *\n * Most interceptors will delegate to this function, and either modify the outgoing request or the\n * response when it arrives. Within the scope of the current request, however, this function may be\n * called any number of times, for any number of downstream requests. Such downstream requests need\n * not be to the same URL or even the same origin as the current request. It is also valid to not\n * call the downstream handler at all, and process the current request entirely within the\n * interceptor.\n *\n * This function should only be called within the scope of the request that's currently being\n * intercepted. Once that request is complete, this downstream handler function should not be\n * called.\n *\n * @publicApi\n *\n * @see [HTTP Guide](guide/http/interceptors)\n */\nexport type HttpHandlerFn = (req: HttpRequest<unknown>) => Observable<HttpEvent<unknown>>;\n\n/**\n * An interceptor for HTTP requests made via `HttpClient`.\n *\n * `HttpInterceptorFn`s are middleware functions which `HttpClient` calls when a request is made.\n * These functions have the opportunity to modify the outgoing request or any response that comes\n * back, as well as block, redirect, or otherwise change the request or response semantics.\n *\n * An `HttpHandlerFn` representing the next interceptor (or the backend which will make a real HTTP\n * request) is provided. Most interceptors will delegate to this function, but that is not required\n * (see `HttpHandlerFn` for more details).\n *\n * `HttpInterceptorFn`s are executed in an [injection context](guide/di/dependency-injection-context).\n * They have access to `inject()` via the `EnvironmentInjector` from which they were configured.\n *\n * @see [HTTP Guide](guide/http/interceptors)\n * @see {@link withInterceptors}\n *\n * @usageNotes\n * Here is a noop interceptor that passes the request through without modifying it:\n * ```typescript\n * export const noopInterceptor: HttpInterceptorFn = (req: HttpRequest<unknown>, next:\n * HttpHandlerFn) => {\n *   return next(modifiedReq);\n * };\n * ```\n *\n * If you want to alter a request, clone it first and modify the clone before passing it to the\n * `next()` handler function.\n *\n * Here is a basic interceptor that adds a bearer token to the headers\n * ```typescript\n * export const authenticationInterceptor: HttpInterceptorFn = (req: HttpRequest<unknown>, next:\n * HttpHandlerFn) => {\n *    const userToken = 'MY_TOKEN'; const modifiedReq = req.clone({\n *      headers: req.headers.set('Authorization', `Bearer ${userToken}`),\n *    });\n *\n *    return next(modifiedReq);\n * };\n * ```\n */\nexport type HttpInterceptorFn = (\n  req: HttpRequest<unknown>,\n  next: HttpHandlerFn,\n) => Observable<HttpEvent<unknown>>;\n\n/**\n * Function which invokes an HTTP interceptor chain.\n *\n * Each interceptor in the interceptor chain is turned into a `ChainedInterceptorFn` which closes\n * over the rest of the chain (represented by another `ChainedInterceptorFn`). The last such\n * function in the chain will instead delegate to the `finalHandlerFn`, which is passed down when\n * the chain is invoked.\n *\n * This pattern allows for a chain of many interceptors to be composed and wrapped in a single\n * `HttpInterceptorFn`, which is a useful abstraction for including different kinds of interceptors\n * (e.g. legacy class-based interceptors) in the same chain.\n */\ntype ChainedInterceptorFn<RequestT> = (\n  req: HttpRequest<RequestT>,\n  finalHandlerFn: HttpHandlerFn,\n) => Observable<HttpEvent<RequestT>>;\n\nfunction interceptorChainEndFn(\n  req: HttpRequest<any>,\n  finalHandlerFn: HttpHandlerFn,\n): Observable<HttpEvent<any>> {\n  return finalHandlerFn(req);\n}\n\n/**\n * Constructs a `ChainedInterceptorFn` which adapts a legacy `HttpInterceptor` to the\n * `ChainedInterceptorFn` interface.\n */\nfunction adaptLegacyInterceptorToChain(\n  chainTailFn: ChainedInterceptorFn<any>,\n  interceptor: HttpInterceptor,\n): ChainedInterceptorFn<any> {\n  return (initialRequest, finalHandlerFn) =>\n    interceptor.intercept(initialRequest, {\n      handle: (downstreamRequest) => chainTailFn(downstreamRequest, finalHandlerFn),\n    });\n}\n\n/**\n * Constructs a `ChainedInterceptorFn` which wraps and invokes a functional interceptor in the given\n * injector.\n */\nfunction chainedInterceptorFn(\n  chainTailFn: ChainedInterceptorFn<unknown>,\n  interceptorFn: HttpInterceptorFn,\n  injector: EnvironmentInjector,\n): ChainedInterceptorFn<unknown> {\n  return (initialRequest, finalHandlerFn) =>\n    runInInjectionContext(injector, () =>\n      interceptorFn(initialRequest, (downstreamRequest) =>\n        chainTailFn(downstreamRequest, finalHandlerFn),\n      ),\n    );\n}\n\n/**\n * A multi-provider token that represents the array of registered\n * `HttpInterceptor` objects.\n *\n * @publicApi\n */\nexport const HTTP_INTERCEPTORS = new InjectionToken<readonly HttpInterceptor[]>(\n  ngDevMode ? 'HTTP_INTERCEPTORS' : '',\n);\n\n/**\n * A multi-provided token of `HttpInterceptorFn`s.\n */\nexport const HTTP_INTERCEPTOR_FNS = new InjectionToken<readonly HttpInterceptorFn[]>(\n  ngDevMode ? 'HTTP_INTERCEPTOR_FNS' : '',\n);\n\n/**\n * A multi-provided token of `HttpInterceptorFn`s that are only set in root.\n */\nexport const HTTP_ROOT_INTERCEPTOR_FNS = new InjectionToken<readonly HttpInterceptorFn[]>(\n  ngDevMode ? 'HTTP_ROOT_INTERCEPTOR_FNS' : '',\n);\n\n// TODO(atscott): We need a larger discussion about stability and what should contribute to stability.\n// Should the whole interceptor chain contribute to stability or just the backend request #55075?\n// Should HttpClient contribute to stability automatically at all?\nexport const REQUESTS_CONTRIBUTE_TO_STABILITY = new InjectionToken<boolean>(\n  ngDevMode ? 'REQUESTS_CONTRIBUTE_TO_STABILITY' : '',\n  {providedIn: 'root', factory: () => true},\n);\n\n/**\n * Creates an `HttpInterceptorFn` which lazily initializes an interceptor chain from the legacy\n * class-based interceptors and runs the request through it.\n */\nexport function legacyInterceptorFnFactory(): HttpInterceptorFn {\n  let chain: ChainedInterceptorFn<any> | null = null;\n\n  return (req, handler) => {\n    if (chain === null) {\n      const interceptors = inject(HTTP_INTERCEPTORS, {optional: true}) ?? [];\n      // Note: interceptors are wrapped right-to-left so that final execution order is\n      // left-to-right. That is, if `interceptors` is the array `[a, b, c]`, we want to\n      // produce a chain that is conceptually `c(b(a(end)))`, which we build from the inside\n      // out.\n      chain = interceptors.reduceRight(\n        adaptLegacyInterceptorToChain,\n        interceptorChainEndFn as ChainedInterceptorFn<any>,\n      );\n    }\n\n    const pendingTasks = inject(PendingTasks);\n    const contributeToStability = inject(REQUESTS_CONTRIBUTE_TO_STABILITY);\n    if (contributeToStability) {\n      const taskId = pendingTasks.add();\n      return chain(req, handler).pipe(finalize(() => pendingTasks.remove(taskId)));\n    } else {\n      return chain(req, handler);\n    }\n  };\n}\n\nlet fetchBackendWarningDisplayed = false;\n\n/** Internal function to reset the flag in tests */\nexport function resetFetchBackendWarningFlag() {\n  fetchBackendWarningDisplayed = false;\n}\n\n@Injectable()\nexport class HttpInterceptorHandler extends HttpHandler {\n  private chain: ChainedInterceptorFn<unknown> | null = null;\n  private readonly pendingTasks = inject(PendingTasks);\n  private readonly contributeToStability = inject(REQUESTS_CONTRIBUTE_TO_STABILITY);\n\n  constructor(\n    private backend: HttpBackend,\n    private injector: EnvironmentInjector,\n  ) {\n    super();\n\n    // We strongly recommend using fetch backend for HTTP calls when SSR is used\n    // for an application. The logic below checks if that's the case and produces\n    // a warning otherwise.\n    if ((typeof ngDevMode === 'undefined' || ngDevMode) && !fetchBackendWarningDisplayed) {\n      const isServer = isPlatformServer(injector.get(PLATFORM_ID));\n      if (isServer && !(this.backend instanceof FetchBackend)) {\n        fetchBackendWarningDisplayed = true;\n        injector\n          .get(Console)\n          .warn(\n            formatRuntimeError(\n              RuntimeErrorCode.NOT_USING_FETCH_BACKEND_IN_SSR,\n              'Angular detected that `HttpClient` is not configured ' +\n                \"to use `fetch` APIs. It's strongly recommended to \" +\n                'enable `fetch` for applications that use Server-Side Rendering ' +\n                'for better performance and compatibility. ' +\n                'To enable `fetch`, add the `withFetch()` to the `provideHttpClient()` ' +\n                'call at the root of the application.',\n            ),\n          );\n      }\n    }\n  }\n\n  override handle(initialRequest: HttpRequest<any>): Observable<HttpEvent<any>> {\n    if (this.chain === null) {\n      const dedupedInterceptorFns = Array.from(\n        new Set([\n          ...this.injector.get(HTTP_INTERCEPTOR_FNS),\n          ...this.injector.get(HTTP_ROOT_INTERCEPTOR_FNS, []),\n        ]),\n      );\n\n      // Note: interceptors are wrapped right-to-left so that final execution order is\n      // left-to-right. That is, if `dedupedInterceptorFns` is the array `[a, b, c]`, we want to\n      // produce a chain that is conceptually `c(b(a(end)))`, which we build from the inside\n      // out.\n      this.chain = dedupedInterceptorFns.reduceRight(\n        (nextSequencedFn, interceptorFn) =>\n          chainedInterceptorFn(nextSequencedFn, interceptorFn, this.injector),\n        interceptorChainEndFn as ChainedInterceptorFn<unknown>,\n      );\n    }\n\n    if (this.contributeToStability) {\n      const taskId = this.pendingTasks.add();\n      return this.chain(initialRequest, (downstreamRequest) =>\n        this.backend.handle(downstreamRequest),\n      ).pipe(finalize(() => this.pendingTasks.remove(taskId)));\n    } else {\n      return this.chain(initialRequest, (downstreamRequest) =>\n        this.backend.handle(downstreamRequest),\n      );\n    }\n  }\n}\n"]}