[6a3a178] | 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | import { DOCUMENT } from '@angular/common';
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| 9 | import { Inject, Injectable } from '@angular/core';
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| 10 | import { Observable } from 'rxjs';
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| 11 | import { HttpErrorResponse, HttpEventType, HttpResponse } from './response';
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| 12 | // Every request made through JSONP needs a callback name that's unique across the
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| 13 | // whole page. Each request is assigned an id and the callback name is constructed
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| 14 | // from that. The next id to be assigned is tracked in a global variable here that
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| 15 | // is shared among all applications on the page.
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| 16 | let nextRequestId = 0;
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| 17 | // Error text given when a JSONP script is injected, but doesn't invoke the callback
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| 18 | // passed in its URL.
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| 19 | export const JSONP_ERR_NO_CALLBACK = 'JSONP injected script did not invoke callback.';
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| 20 | // Error text given when a request is passed to the JsonpClientBackend that doesn't
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| 21 | // have a request method JSONP.
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| 22 | export const JSONP_ERR_WRONG_METHOD = 'JSONP requests must use JSONP request method.';
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| 23 | export const JSONP_ERR_WRONG_RESPONSE_TYPE = 'JSONP requests must use Json response type.';
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| 24 | /**
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| 25 | * DI token/abstract type representing a map of JSONP callbacks.
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| 26 | *
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| 27 | * In the browser, this should always be the `window` object.
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| 28 | *
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| 29 | *
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| 30 | */
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| 31 | export class JsonpCallbackContext {
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| 32 | }
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| 33 | /**
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| 34 | * Processes an `HttpRequest` with the JSONP method,
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| 35 | * by performing JSONP style requests.
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| 36 | * @see `HttpHandler`
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| 37 | * @see `HttpXhrBackend`
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| 38 | *
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| 39 | * @publicApi
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| 40 | */
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| 41 | export class JsonpClientBackend {
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| 42 | constructor(callbackMap, document) {
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| 43 | this.callbackMap = callbackMap;
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| 44 | this.document = document;
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| 45 | /**
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| 46 | * A resolved promise that can be used to schedule microtasks in the event handlers.
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| 47 | */
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| 48 | this.resolvedPromise = Promise.resolve();
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| 49 | }
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| 50 | /**
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| 51 | * Get the name of the next callback method, by incrementing the global `nextRequestId`.
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| 52 | */
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| 53 | nextCallback() {
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| 54 | return `ng_jsonp_callback_${nextRequestId++}`;
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| 55 | }
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| 56 | /**
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| 57 | * Processes a JSONP request and returns an event stream of the results.
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| 58 | * @param req The request object.
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| 59 | * @returns An observable of the response events.
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| 60 | *
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| 61 | */
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| 62 | handle(req) {
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| 63 | // Firstly, check both the method and response type. If either doesn't match
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| 64 | // then the request was improperly routed here and cannot be handled.
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| 65 | if (req.method !== 'JSONP') {
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| 66 | throw new Error(JSONP_ERR_WRONG_METHOD);
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| 67 | }
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| 68 | else if (req.responseType !== 'json') {
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| 69 | throw new Error(JSONP_ERR_WRONG_RESPONSE_TYPE);
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| 70 | }
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| 71 | // Everything else happens inside the Observable boundary.
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| 72 | return new Observable((observer) => {
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| 73 | // The first step to make a request is to generate the callback name, and replace the
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| 74 | // callback placeholder in the URL with the name. Care has to be taken here to ensure
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| 75 | // a trailing &, if matched, gets inserted back into the URL in the correct place.
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| 76 | const callback = this.nextCallback();
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| 77 | const url = req.urlWithParams.replace(/=JSONP_CALLBACK(&|$)/, `=${callback}$1`);
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| 78 | // Construct the <script> tag and point it at the URL.
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| 79 | const node = this.document.createElement('script');
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| 80 | node.src = url;
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| 81 | // A JSONP request requires waiting for multiple callbacks. These variables
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| 82 | // are closed over and track state across those callbacks.
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| 83 | // The response object, if one has been received, or null otherwise.
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| 84 | let body = null;
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| 85 | // Whether the response callback has been called.
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| 86 | let finished = false;
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| 87 | // Whether the request has been cancelled (and thus any other callbacks)
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| 88 | // should be ignored.
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| 89 | let cancelled = false;
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| 90 | // Set the response callback in this.callbackMap (which will be the window
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| 91 | // object in the browser. The script being loaded via the <script> tag will
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| 92 | // eventually call this callback.
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| 93 | this.callbackMap[callback] = (data) => {
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| 94 | // Data has been received from the JSONP script. Firstly, delete this callback.
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| 95 | delete this.callbackMap[callback];
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| 96 | // Next, make sure the request wasn't cancelled in the meantime.
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| 97 | if (cancelled) {
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| 98 | return;
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| 99 | }
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| 100 | // Set state to indicate data was received.
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| 101 | body = data;
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| 102 | finished = true;
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| 103 | };
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| 104 | // cleanup() is a utility closure that removes the <script> from the page and
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| 105 | // the response callback from the window. This logic is used in both the
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| 106 | // success, error, and cancellation paths, so it's extracted out for convenience.
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| 107 | const cleanup = () => {
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| 108 | // Remove the <script> tag if it's still on the page.
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| 109 | if (node.parentNode) {
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| 110 | node.parentNode.removeChild(node);
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| 111 | }
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| 112 | // Remove the response callback from the callbackMap (window object in the
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| 113 | // browser).
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| 114 | delete this.callbackMap[callback];
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| 115 | };
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| 116 | // onLoad() is the success callback which runs after the response callback
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| 117 | // if the JSONP script loads successfully. The event itself is unimportant.
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| 118 | // If something went wrong, onLoad() may run without the response callback
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| 119 | // having been invoked.
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| 120 | const onLoad = (event) => {
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| 121 | // Do nothing if the request has been cancelled.
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| 122 | if (cancelled) {
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| 123 | return;
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| 124 | }
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| 125 | // We wrap it in an extra Promise, to ensure the microtask
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| 126 | // is scheduled after the loaded endpoint has executed any potential microtask itself,
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| 127 | // which is not guaranteed in Internet Explorer and EdgeHTML. See issue #39496
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| 128 | this.resolvedPromise.then(() => {
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| 129 | // Cleanup the page.
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| 130 | cleanup();
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| 131 | // Check whether the response callback has run.
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| 132 | if (!finished) {
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| 133 | // It hasn't, something went wrong with the request. Return an error via
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| 134 | // the Observable error path. All JSONP errors have status 0.
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| 135 | observer.error(new HttpErrorResponse({
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| 136 | url,
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| 137 | status: 0,
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| 138 | statusText: 'JSONP Error',
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| 139 | error: new Error(JSONP_ERR_NO_CALLBACK),
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| 140 | }));
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| 141 | return;
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| 142 | }
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| 143 | // Success. body either contains the response body or null if none was
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| 144 | // returned.
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| 145 | observer.next(new HttpResponse({
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| 146 | body,
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| 147 | status: 200 /* Ok */,
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| 148 | statusText: 'OK',
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| 149 | url,
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| 150 | }));
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| 151 | // Complete the stream, the response is over.
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| 152 | observer.complete();
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| 153 | });
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| 154 | };
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| 155 | // onError() is the error callback, which runs if the script returned generates
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| 156 | // a Javascript error. It emits the error via the Observable error channel as
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| 157 | // a HttpErrorResponse.
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| 158 | const onError = (error) => {
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| 159 | // If the request was already cancelled, no need to emit anything.
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| 160 | if (cancelled) {
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| 161 | return;
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| 162 | }
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| 163 | cleanup();
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| 164 | // Wrap the error in a HttpErrorResponse.
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| 165 | observer.error(new HttpErrorResponse({
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| 166 | error,
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| 167 | status: 0,
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| 168 | statusText: 'JSONP Error',
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| 169 | url,
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| 170 | }));
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| 171 | };
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| 172 | // Subscribe to both the success (load) and error events on the <script> tag,
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| 173 | // and add it to the page.
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| 174 | node.addEventListener('load', onLoad);
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| 175 | node.addEventListener('error', onError);
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| 176 | this.document.body.appendChild(node);
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| 177 | // The request has now been successfully sent.
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| 178 | observer.next({ type: HttpEventType.Sent });
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| 179 | // Cancellation handler.
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| 180 | return () => {
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| 181 | // Track the cancellation so event listeners won't do anything even if already scheduled.
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| 182 | cancelled = true;
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| 183 | // Remove the event listeners so they won't run if the events later fire.
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| 184 | node.removeEventListener('load', onLoad);
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| 185 | node.removeEventListener('error', onError);
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| 186 | // And finally, clean up the page.
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| 187 | cleanup();
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| 188 | };
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| 189 | });
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| 190 | }
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| 191 | }
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| 192 | JsonpClientBackend.decorators = [
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| 193 | { type: Injectable }
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| 194 | ];
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| 195 | JsonpClientBackend.ctorParameters = () => [
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| 196 | { type: JsonpCallbackContext },
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| 197 | { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }
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| 198 | ];
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| 199 | /**
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| 200 | * Identifies requests with the method JSONP and
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| 201 | * shifts them to the `JsonpClientBackend`.
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| 202 | *
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| 203 | * @see `HttpInterceptor`
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| 204 | *
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| 205 | * @publicApi
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| 206 | */
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| 207 | export class JsonpInterceptor {
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| 208 | constructor(jsonp) {
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| 209 | this.jsonp = jsonp;
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| 210 | }
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| 211 | /**
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| 212 | * Identifies and handles a given JSONP request.
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| 213 | * @param req The outgoing request object to handle.
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| 214 | * @param next The next interceptor in the chain, or the backend
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| 215 | * if no interceptors remain in the chain.
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| 216 | * @returns An observable of the event stream.
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| 217 | */
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| 218 | intercept(req, next) {
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| 219 | if (req.method === 'JSONP') {
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| 220 | return this.jsonp.handle(req);
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| 221 | }
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| 222 | // Fall through for normal HTTP requests.
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| 223 | return next.handle(req);
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| 224 | }
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| 225 | }
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| 226 | JsonpInterceptor.decorators = [
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| 227 | { type: Injectable }
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| 228 | ];
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| 229 | JsonpInterceptor.ctorParameters = () => [
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| 230 | { type: JsonpClientBackend }
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| 231 | ];
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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// 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/**\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 * Processes an `HttpRequest` with the JSONP method,\n * by performing JSONP style requests.\n * @see `HttpHandler`\n * @see `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(private callbackMap: JsonpCallbackContext, @Inject(DOCUMENT) private document: any) {}\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    // 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      // Whether the request has been cancelled (and thus any other callbacks)\n      // should be ignored.\n      let cancelled: 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        // Next, make sure the request wasn't cancelled in the meantime.\n        if (cancelled) {\n          return;\n        }\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        // Do nothing if the request has been cancelled.\n        if (cancelled) {\n          return;\n        }\n\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(new HttpErrorResponse({\n              url,\n              status: 0,\n              statusText: 'JSONP Error',\n              error: new Error(JSONP_ERR_NO_CALLBACK),\n            }));\n            return;\n          }\n\n          // Success. body either contains the response body or null if none was\n          // returned.\n          observer.next(new HttpResponse({\n            body,\n            status: HttpStatusCode.Ok,\n            statusText: 'OK',\n            url,\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        // If the request was already cancelled, no need to emit anything.\n        if (cancelled) {\n          return;\n        }\n        cleanup();\n\n        // Wrap the error in a HttpErrorResponse.\n        observer.error(new HttpErrorResponse({\n          error,\n          status: 0,\n          statusText: 'JSONP Error',\n          url,\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        // Track the cancellation so event listeners won't do anything even if already scheduled.\n        cancelled = true;\n\n        // Remove the event listeners so they won't run if the events later fire.\n        node.removeEventListener('load', onLoad);\n        node.removeEventListener('error', onError);\n\n        // And finally, clean up the page.\n        cleanup();\n      };\n    });\n  }\n}\n\n/**\n * Identifies requests with the method JSONP and\n * shifts them to the `JsonpClientBackend`.\n *\n * @see `HttpInterceptor`\n *\n * @publicApi\n */\n@Injectable()\nexport class JsonpInterceptor {\n  constructor(private jsonp: JsonpClientBackend) {}\n\n  /**\n   * Identifies and handles a given JSONP 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    if (req.method === 'JSONP') {\n      return this.jsonp.handle(req as HttpRequest<never>);\n    }\n    // Fall through for normal HTTP requests.\n    return next.handle(req);\n  }\n}\n"]} |
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