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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 { DOCUMENT } from '@angular/common'; import { EnvironmentInjector, Inject, inject, Injectable, runInInjectionContext, } from '@angular/core'; import { Observable } from 'rxjs'; import { HttpErrorResponse, HttpEventType, HttpResponse, HttpStatusCode, } from './response'; import * as i0 from "@angular/core"; // Every request made through JSONP needs a callback name that's unique across the // whole page. Each request is assigned an id and the callback name is constructed // from that. The next id to be assigned is tracked in a global variable here that // is shared among all applications on the page. let nextRequestId = 0; /** * When a pending <script> is unsubscribed we'll move it to this document, so it won't be * executed. */ let foreignDocument; // Error text given when a JSONP script is injected, but doesn't invoke the callback // passed in its URL. export const JSONP_ERR_NO_CALLBACK = 'JSONP injected script did not invoke callback.'; // Error text given when a request is passed to the JsonpClientBackend that doesn't // have a request method JSONP. export const JSONP_ERR_WRONG_METHOD = 'JSONP requests must use JSONP request method.'; export const JSONP_ERR_WRONG_RESPONSE_TYPE = 'JSONP requests must use Json response type.'; // Error text given when a request is passed to the JsonpClientBackend that has // headers set export const JSONP_ERR_HEADERS_NOT_SUPPORTED = 'JSONP requests do not support headers.'; /** * DI token/abstract type representing a map of JSONP callbacks. * * In the browser, this should always be the `window` object. * * */ export class JsonpCallbackContext { } /** * Factory function that determines where to store JSONP callbacks. * * Ordinarily JSONP callbacks are stored on the `window` object, but this may not exist * in test environments. In that case, callbacks are stored on an anonymous object instead. * * */ export function jsonpCallbackContext() { if (typeof window === 'object') { return window; } return {}; } /** * Processes an `HttpRequest` with the JSONP method, * by performing JSONP style requests. * @see {@link HttpHandler} * @see {@link HttpXhrBackend} * * @publicApi */ export class JsonpClientBackend { constructor(callbackMap, document) { this.callbackMap = callbackMap; this.document = document; /** * A resolved promise that can be used to schedule microtasks in the event handlers. */ this.resolvedPromise = Promise.resolve(); } /** * Get the name of the next callback method, by incrementing the global `nextRequestId`. */ nextCallback() { return `ng_jsonp_callback_${nextRequestId++}`; } /** * Processes a JSONP request and returns an event stream of the results. * @param req The request object. * @returns An observable of the response events. * */ handle(req) { // Firstly, check both the method and response type. If either doesn't match // then the request was improperly routed here and cannot be handled. if (req.method !== 'JSONP') { throw new Error(JSONP_ERR_WRONG_METHOD); } else if (req.responseType !== 'json') { throw new Error(JSONP_ERR_WRONG_RESPONSE_TYPE); } // Check the request headers. JSONP doesn't support headers and // cannot set any that were supplied. if (req.headers.keys().length > 0) { throw new Error(JSONP_ERR_HEADERS_NOT_SUPPORTED); } // Everything else happens inside the Observable boundary. return new Observable((observer) => { // The first step to make a request is to generate the callback name, and replace the // callback placeholder in the URL with the name. Care has to be taken here to ensure // a trailing &, if matched, gets inserted back into the URL in the correct place. const callback = this.nextCallback(); const url = req.urlWithParams.replace(/=JSONP_CALLBACK(&|$)/, `=${callback}$1`); // Construct the <script> tag and point it at the URL. const node = this.document.createElement('script'); node.src = url; // A JSONP request requires waiting for multiple callbacks. These variables // are closed over and track state across those callbacks. // The response object, if one has been received, or null otherwise. let body = null; // Whether the response callback has been called. let finished = false; // Set the response callback in this.callbackMap (which will be the window // object in the browser. The script being loaded via the <script> tag will // eventually call this callback. this.callbackMap[callback] = (data) => { // Data has been received from the JSONP script. Firstly, delete this callback. delete this.callbackMap[callback]; // Set state to indicate data was received. body = data; finished = true; }; // cleanup() is a utility closure that removes the <script> from the page and // the response callback from the window. This logic is used in both the // success, error, and cancellation paths, so it's extracted out for convenience. const cleanup = () => { // Remove the <script> tag if it's still on the page. if (node.parentNode) { node.parentNode.removeChild(node); } // Remove the response callback from the callbackMap (window object in the // browser). delete this.callbackMap[callback]; }; // onLoad() is the success callback which runs after the response callback // if the JSONP script loads successfully. The event itself is unimportant. // If something went wrong, onLoad() may run without the response callback // having been invoked. const onLoad = (event) => { // We wrap it in an extra Promise, to ensure the microtask // is scheduled after the loaded endpoint has executed any potential microtask itself, // which is not guaranteed in Internet Explorer and EdgeHTML. See issue #39496 this.resolvedPromise.then(() => { // Cleanup the page. cleanup(); // Check whether the response callback has run. if (!finished) { // It hasn't, something went wrong with the request. Return an error via // the Observable error path. All JSONP errors have status 0. observer.error(new HttpErrorResponse({ url, status: 0, statusText: 'JSONP Error', error: new Error(JSONP_ERR_NO_CALLBACK), })); return; } // Success. body either contains the response body or null if none was // returned. observer.next(new HttpResponse({ body, status: HttpStatusCode.Ok, statusText: 'OK', url, })); // Complete the stream, the response is over. observer.complete(); }); }; // onError() is the error callback, which runs if the script returned generates // a Javascript error. It emits the error via the Observable error channel as // a HttpErrorResponse. const onError = (error) => { cleanup(); // Wrap the error in a HttpErrorResponse. observer.error(new HttpErrorResponse({ error, status: 0, statusText: 'JSONP Error', url, })); }; // Subscribe to both the success (load) and error events on the <script> tag, // and add it to the page. node.addEventListener('load', onLoad); node.addEventListener('error', onError); this.document.body.appendChild(node); // The request has now been successfully sent. observer.next({ type: HttpEventType.Sent }); // Cancellation handler. return () => { if (!finished) { this.removeListeners(node); } // And finally, clean up the page. cleanup(); }; }); } removeListeners(script) { // Issue #34818 // Changing <script>'s ownerDocument will prevent it from execution. // https://html.spec.whatwg.org/multipage/scripting.html#execute-the-script-block foreignDocument ??= this.document.implementation.createHTMLDocument(); foreignDocument.adoptNode(script); } static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.9", ngImport: i0, type: JsonpClientBackend, deps: [{ token: JsonpCallbackContext }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable }); } static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "17.3.9", ngImport: i0, type: JsonpClientBackend }); } } i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.9", ngImport: i0, type: JsonpClientBackend, decorators: [{ type: Injectable }], ctorParameters: () => [{ type: JsonpCallbackContext }, { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT] }] }] }); /** * Identifies requests with the method JSONP and shifts them to the `JsonpClientBackend`. */ export function jsonpInterceptorFn(req, next) { if (req.method === 'JSONP') { return inject(JsonpClientBackend).handle(req); } // Fall through for normal HTTP requests. return next(req); } /** * Identifies requests with the method JSONP and * shifts them to the `JsonpClientBackend`. * * @see {@link HttpInterceptor} * * @publicApi */ export class JsonpInterceptor { constructor(injector) { this.injector = injector; } /** * Identifies and handles a given JSONP request. * @param initialRequest The outgoing request object to handle. * @param next The next interceptor in the chain, or the backend * if no interceptors remain in the chain. * @returns An observable of the event stream. */ intercept(initialRequest, next) { return runInInjectionContext(this.injector, () => jsonpInterceptorFn(initialRequest, (downstreamRequest) => next.handle(downstreamRequest))); } static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.9", ngImport: i0, type: JsonpInterceptor, deps: [{ token: i0.EnvironmentInjector }], target: i0.ɵɵFactoryTarget.Injectable }); } static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "17.3.9", ngImport: i0, type: JsonpInterceptor }); } } i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.9", ngImport: i0, type: JsonpInterceptor, decorators: [{ type: Injectable }], ctorParameters: () => [{ 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.io/license\n */\n\nimport {DOCUMENT} from '@angular/common';\nimport {\n  EnvironmentInjector,\n  Inject,\n  inject,\n  Injectable,\n  runInInjectionContext,\n} from '@angular/core';\nimport {Observable, Observer} from 'rxjs';\n\nimport {HttpBackend, HttpHandler} from './backend';\nimport {HttpHandlerFn} from './interceptor';\nimport {HttpRequest} from './request';\nimport {\n  HttpErrorResponse,\n  HttpEvent,\n  HttpEventType,\n  HttpResponse,\n  HttpStatusCode,\n} from './response';\n\n// Every request made through JSONP needs a callback name that's unique across the\n// whole page. Each request is assigned an id and the callback name is constructed\n// from that. The next id to be assigned is tracked in a global variable here that\n// is shared among all applications on the page.\nlet nextRequestId: number = 0;\n\n/**\n * When a pending <script> is unsubscribed we'll move it to this document, so it won't be\n * executed.\n */\nlet foreignDocument: Document | undefined;\n\n// Error text given when a JSONP script is injected, but doesn't invoke the callback\n// passed in its URL.\nexport const JSONP_ERR_NO_CALLBACK = 'JSONP injected script did not invoke callback.';\n\n// Error text given when a request is passed to the JsonpClientBackend that doesn't\n// have a request method JSONP.\nexport const JSONP_ERR_WRONG_METHOD = 'JSONP requests must use JSONP request method.';\nexport const JSONP_ERR_WRONG_RESPONSE_TYPE = 'JSONP requests must use Json response type.';\n\n// Error text given when a request is passed to the JsonpClientBackend that has\n// headers set\nexport const JSONP_ERR_HEADERS_NOT_SUPPORTED = 'JSONP requests do not support headers.';\n\n/**\n * DI token/abstract type representing a map of JSONP callbacks.\n *\n * In the browser, this should always be the `window` object.\n *\n *\n */\nexport abstract class JsonpCallbackContext {\n  [key: string]: (data: any) => void;\n}\n\n/**\n * Factory function that determines where to store JSONP callbacks.\n *\n * Ordinarily JSONP callbacks are stored on the `window` object, but this may not exist\n * in test environments. In that case, callbacks are stored on an anonymous object instead.\n *\n *\n */\nexport function jsonpCallbackContext(): Object {\n  if (typeof window === 'object') {\n    return window;\n  }\n  return {};\n}\n\n/**\n * Processes an `HttpRequest` with the JSONP method,\n * by performing JSONP style requests.\n * @see {@link HttpHandler}\n * @see {@link HttpXhrBackend}\n *\n * @publicApi\n */\n@Injectable()\nexport class JsonpClientBackend implements HttpBackend {\n  /**\n   * A resolved promise that can be used to schedule microtasks in the event handlers.\n   */\n  private readonly resolvedPromise = Promise.resolve();\n\n  constructor(\n    private callbackMap: JsonpCallbackContext,\n    @Inject(DOCUMENT) private document: any,\n  ) {}\n\n  /**\n   * Get the name of the next callback method, by incrementing the global `nextRequestId`.\n   */\n  private nextCallback(): string {\n    return `ng_jsonp_callback_${nextRequestId++}`;\n  }\n\n  /**\n   * Processes a JSONP request and returns an event stream of the results.\n   * @param req The request object.\n   * @returns An observable of the response events.\n   *\n   */\n  handle(req: HttpRequest<never>): Observable<HttpEvent<any>> {\n    // Firstly, check both the method and response type. If either doesn't match\n    // then the request was improperly routed here and cannot be handled.\n    if (req.method !== 'JSONP') {\n      throw new Error(JSONP_ERR_WRONG_METHOD);\n    } else if (req.responseType !== 'json') {\n      throw new Error(JSONP_ERR_WRONG_RESPONSE_TYPE);\n    }\n\n    // Check the request headers. JSONP doesn't support headers and\n    // cannot set any that were supplied.\n    if (req.headers.keys().length > 0) {\n      throw new Error(JSONP_ERR_HEADERS_NOT_SUPPORTED);\n    }\n\n    // Everything else happens inside the Observable boundary.\n    return new Observable<HttpEvent<any>>((observer: Observer<HttpEvent<any>>) => {\n      // The first step to make a request is to generate the callback name, and replace the\n      // callback placeholder in the URL with the name. Care has to be taken here to ensure\n      // a trailing &, if matched, gets inserted back into the URL in the correct place.\n      const callback = this.nextCallback();\n      const url = req.urlWithParams.replace(/=JSONP_CALLBACK(&|$)/, `=${callback}$1`);\n\n      // Construct the <script> tag and point it at the URL.\n      const node = this.document.createElement('script');\n      node.src = url;\n\n      // A JSONP request requires waiting for multiple callbacks. These variables\n      // are closed over and track state across those callbacks.\n\n      // The response object, if one has been received, or null otherwise.\n      let body: any | null = null;\n\n      // Whether the response callback has been called.\n      let finished: boolean = false;\n\n      // Set the response callback in this.callbackMap (which will be the window\n      // object in the browser. The script being loaded via the <script> tag will\n      // eventually call this callback.\n      this.callbackMap[callback] = (data?: any) => {\n        // Data has been received from the JSONP script. Firstly, delete this callback.\n        delete this.callbackMap[callback];\n\n        // Set state to indicate data was received.\n        body = data;\n        finished = true;\n      };\n\n      // cleanup() is a utility closure that removes the <script> from the page and\n      // the response callback from the window. This logic is used in both the\n      // success, error, and cancellation paths, so it's extracted out for convenience.\n      const cleanup = () => {\n        // Remove the <script> tag if it's still on the page.\n        if (node.parentNode) {\n          node.parentNode.removeChild(node);\n        }\n\n        // Remove the response callback from the callbackMap (window object in the\n        // browser).\n        delete this.callbackMap[callback];\n      };\n\n      // onLoad() is the success callback which runs after the response callback\n      // if the JSONP script loads successfully. The event itself is unimportant.\n      // If something went wrong, onLoad() may run without the response callback\n      // having been invoked.\n      const onLoad = (event: Event) => {\n        // We wrap it in an extra Promise, to ensure the microtask\n        // is scheduled after the loaded endpoint has executed any potential microtask itself,\n        // which is not guaranteed in Internet Explorer and EdgeHTML. See issue #39496\n        this.resolvedPromise.then(() => {\n          // Cleanup the page.\n          cleanup();\n\n          // Check whether the response callback has run.\n          if (!finished) {\n            // It hasn't, something went wrong with the request. Return an error via\n            // the Observable error path. All JSONP errors have status 0.\n            observer.error(\n              new HttpErrorResponse({\n                url,\n                status: 0,\n                statusText: 'JSONP Error',\n                error: new Error(JSONP_ERR_NO_CALLBACK),\n              }),\n            );\n            return;\n          }\n\n          // Success. body either contains the response body or null if none was\n          // returned.\n          observer.next(\n            new HttpResponse({\n              body,\n              status: HttpStatusCode.Ok,\n              statusText: 'OK',\n              url,\n            }),\n          );\n\n          // Complete the stream, the response is over.\n          observer.complete();\n        });\n      };\n\n      // onError() is the error callback, which runs if the script returned generates\n      // a Javascript error. It emits the error via the Observable error channel as\n      // a HttpErrorResponse.\n      const onError: any = (error: Error) => {\n        cleanup();\n\n        // Wrap the error in a HttpErrorResponse.\n        observer.error(\n          new HttpErrorResponse({\n            error,\n            status: 0,\n            statusText: 'JSONP Error',\n            url,\n          }),\n        );\n      };\n\n      // Subscribe to both the success (load) and error events on the <script> tag,\n      // and add it to the page.\n      node.addEventListener('load', onLoad);\n      node.addEventListener('error', onError);\n      this.document.body.appendChild(node);\n\n      // The request has now been successfully sent.\n      observer.next({type: HttpEventType.Sent});\n\n      // Cancellation handler.\n      return () => {\n        if (!finished) {\n          this.removeListeners(node);\n        }\n\n        // And finally, clean up the page.\n        cleanup();\n      };\n    });\n  }\n\n  private removeListeners(script: HTMLScriptElement): void {\n    // Issue #34818\n    // Changing <script>'s ownerDocument will prevent it from execution.\n    // https://html.spec.whatwg.org/multipage/scripting.html#execute-the-script-block\n    foreignDocument ??= (this.document.implementation as DOMImplementation).createHTMLDocument();\n\n    foreignDocument.adoptNode(script);\n  }\n}\n\n/**\n * Identifies requests with the method JSONP and shifts them to the `JsonpClientBackend`.\n */\nexport function jsonpInterceptorFn(\n  req: HttpRequest<unknown>,\n  next: HttpHandlerFn,\n): Observable<HttpEvent<unknown>> {\n  if (req.method === 'JSONP') {\n    return inject(JsonpClientBackend).handle(req as HttpRequest<never>);\n  }\n\n  // Fall through for normal HTTP requests.\n  return next(req);\n}\n\n/**\n * Identifies requests with the method JSONP and\n * shifts them to the `JsonpClientBackend`.\n *\n * @see {@link HttpInterceptor}\n *\n * @publicApi\n */\n@Injectable()\nexport class JsonpInterceptor {\n  constructor(private injector: EnvironmentInjector) {}\n\n  /**\n   * Identifies and handles a given JSONP request.\n   * @param initialRequest 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(initialRequest: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {\n    return runInInjectionContext(this.injector, () =>\n      jsonpInterceptorFn(initialRequest, (downstreamRequest) => next.handle(downstreamRequest)),\n    );\n  }\n}\n"]}