@angular/common
Version:
Angular - commonly needed directives and services
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JavaScript
/**
* @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 { EnvironmentInjector, inject, Injectable, InjectionToken } from '@angular/core';
import { HttpBackend, HttpHandler } from './backend';
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) {
// clang-format off
return (initialRequest, finalHandlerFn) => injector.runInContext(() => interceptorFn(initialRequest, downstreamRequest => chainTailFn(downstreamRequest, finalHandlerFn)));
// clang-format on
}
/**
* A multi-provider token that represents the array of registered
* `HttpInterceptor` objects.
*
* @publicApi
*/
export const HTTP_INTERCEPTORS = new InjectionToken('HTTP_INTERCEPTORS');
/**
* A multi-provided token of `HttpInterceptorFn`s.
*/
export const HTTP_INTERCEPTOR_FNS = new InjectionToken('HTTP_INTERCEPTOR_FNS');
/**
* 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);
}
return chain(req, handler);
};
}
export class HttpInterceptorHandler extends HttpHandler {
constructor(backend, injector) {
super();
this.backend = backend;
this.injector = injector;
this.chain = null;
}
handle(initialRequest) {
if (this.chain === null) {
const dedupedInterceptorFns = Array.from(new Set(this.injector.get(HTTP_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);
}
return this.chain(initialRequest, downstreamRequest => this.backend.handle(downstreamRequest));
}
}
HttpInterceptorHandler.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.1.1", ngImport: i0, type: HttpInterceptorHandler, deps: [{ token: i1.HttpBackend }, { token: i0.EnvironmentInjector }], target: i0.ɵɵFactoryTarget.Injectable });
HttpInterceptorHandler.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.1.1", ngImport: i0, type: HttpInterceptorHandler });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.1.1", ngImport: i0, type: HttpInterceptorHandler, decorators: [{
type: Injectable
}], ctorParameters: function () { return [{ type: i1.HttpBackend }, { type: i0.EnvironmentInjector }]; } });
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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#intercepting-requests-and-responses)\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#intercepting-requests-and-responses)\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 have access to `inject()` via the `EnvironmentInjector` from which they were\n * configured.\n */\nexport type HttpInterceptorFn = (req: HttpRequest<unknown>, 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> = (req: HttpRequest<RequestT>, finalHandlerFn: HttpHandlerFn) =>\n    Observable<HttpEvent<RequestT>>;\n\nfunction interceptorChainEndFn(\n    req: HttpRequest<any>, finalHandlerFn: HttpHandlerFn): 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): ChainedInterceptorFn<any> {\n  return (initialRequest, finalHandlerFn) => 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>, interceptorFn: HttpInterceptorFn,\n    injector: EnvironmentInjector): ChainedInterceptorFn<unknown> {\n  // clang-format off\n  return (initialRequest, finalHandlerFn) => injector.runInContext(() =>\n    interceptorFn(\n      initialRequest,\n      downstreamRequest => chainTailFn(downstreamRequest, finalHandlerFn)\n    )\n  );\n  // clang-format on\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<HttpInterceptor[]>('HTTP_INTERCEPTORS');\n\n/**\n * A multi-provided token of `HttpInterceptorFn`s.\n */\nexport const HTTP_INTERCEPTOR_FNS = new InjectionToken<HttpInterceptorFn[]>('HTTP_INTERCEPTOR_FNS');\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, interceptorChainEndFn as ChainedInterceptorFn<any>);\n    }\n\n    return chain(req, handler);\n  };\n}\n\n@Injectable()\nexport class HttpInterceptorHandler extends HttpHandler {\n  private chain: ChainedInterceptorFn<unknown>|null = null;\n\n  constructor(private backend: HttpBackend, private injector: EnvironmentInjector) {\n    super();\n  }\n\n  override handle(initialRequest: HttpRequest<any>): Observable<HttpEvent<any>> {\n    if (this.chain === null) {\n      const dedupedInterceptorFns = Array.from(new Set(this.injector.get(HTTP_INTERCEPTOR_FNS)));\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    return this.chain(initialRequest, downstreamRequest => this.backend.handle(downstreamRequest));\n  }\n}\n"]}