/**
 * @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 { Inject, Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import { HttpErrorResponse, HttpEventType, HttpResponse } from './response';
// 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;
// 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.';
/**
 * DI token/abstract type representing a map of JSONP callbacks.
 *
 * In the browser, this should always be the `window` object.
 *
 *
 */
export class JsonpCallbackContext {
}
/**
 * Processes an `HttpRequest` with the JSONP method,
 * by performing JSONP style requests.
 * @see `HttpHandler`
 * @see `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_${nextRequestId++}`;
    }
    /**
     * Processes a JSONP request and returns an event stream of the results.
     * @param req The request object.
     * @returns An observable of the response events.
     *
     */
    handle(req) {
        // Firstly, check both the method and response type. If either doesn't match
        // then the request was improperly routed here and cannot be handled.
        if (req.method !== 'JSONP') {
            throw new Error(JSONP_ERR_WRONG_METHOD);
        }
        else if (req.responseType !== 'json') {
            throw new Error(JSONP_ERR_WRONG_RESPONSE_TYPE);
        }
        // Everything else happens inside the Observable boundary.
        return new Observable((observer) => {
            // The first step to make a request is to generate the callback name, and replace the
            // callback placeholder in the URL with the name. Care has to be taken here to ensure
            // a trailing &, if matched, gets inserted back into the URL in the correct place.
            const callback = this.nextCallback();
            const url = req.urlWithParams.replace(/=JSONP_CALLBACK(&|$)/, `=${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;
            // Whether the request has been cancelled (and thus any other callbacks)
            // should be ignored.
            let cancelled = 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];
                // Next, make sure the request wasn't cancelled in the meantime.
                if (cancelled) {
                    return;
                }
                // 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) => {
                // Do nothing if the request has been cancelled.
                if (cancelled) {
                    return;
                }
                // 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: 200 /* 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) => {
                // If the request was already cancelled, no need to emit anything.
                if (cancelled) {
                    return;
                }
                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 () => {
                // Track the cancellation so event listeners won't do anything even if already scheduled.
                cancelled = true;
                // Remove the event listeners so they won't run if the events later fire.
                node.removeEventListener('load', onLoad);
                node.removeEventListener('error', onError);
                // And finally, clean up the page.
                cleanup();
            };
        });
    }
}
JsonpClientBackend.decorators = [
    { type: Injectable }
];
JsonpClientBackend.ctorParameters = () => [
    { type: JsonpCallbackContext },
    { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }
];
/**
 * Identifies requests with the method JSONP and
 * shifts them to the `JsonpClientBackend`.
 *
 * @see `HttpInterceptor`
 *
 * @publicApi
 */
export class JsonpInterceptor {
    constructor(jsonp) {
        this.jsonp = jsonp;
    }
    /**
     * Identifies and handles a given JSONP request.
     * @param req 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(req, next) {
        if (req.method === 'JSONP') {
            return this.jsonp.handle(req);
        }
        // Fall through for normal HTTP requests.
        return next.handle(req);
    }
}
JsonpInterceptor.decorators = [
    { type: Injectable }
];
JsonpInterceptor.ctorParameters = () => [
    { type: JsonpClientBackend }
];
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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"]}