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http.ts
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http.ts
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/**
* @license
* Copyright Google Inc. 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
*/
const xhr2: any = require('xhr2');
import {Injectable, Optional, Provider} from '@angular/core';
import {BrowserXhr, Connection, ConnectionBackend, Http, ReadyState, Request, RequestOptions, Response, XHRBackend, XSRFStrategy} from '@angular/http';
import {HttpClient, HttpEvent, HttpRequest, HttpHandler, HttpInterceptor, HttpResponse, HTTP_INTERCEPTORS, HttpBackend, XhrFactory, ɵinterceptingHandler as interceptingHandler} from '@angular/common/http';
import {Observable} from 'rxjs/Observable';
import {Observer} from 'rxjs/Observer';
import {Subscription} from 'rxjs/Subscription';
const isAbsoluteUrl = /^[a-zA-Z\-\+.]+:\/\//;
function validateRequestUrl(url: string): void {
if (!isAbsoluteUrl.test(url)) {
throw new Error(`URLs requested via Http on the server must be absolute. URL: ${url}`);
}
}
@Injectable()
export class ServerXhr implements BrowserXhr {
build(): XMLHttpRequest { return new xhr2.XMLHttpRequest(); }
}
@Injectable()
export class ServerXsrfStrategy implements XSRFStrategy {
configureRequest(req: Request): void {}
}
export abstract class ZoneMacroTaskWrapper<S, R> {
wrap(request: S): Observable<R> {
return new Observable((observer: Observer<R>) => {
let task: Task = null !;
let scheduled: boolean = false;
let sub: Subscription|null = null;
let savedResult: any = null;
let savedError: any = null;
const scheduleTask = (_task: Task) => {
task = _task;
scheduled = true;
const delegate = this.delegate(request);
sub = delegate.subscribe(
res => savedResult = res,
err => {
if (!scheduled) {
throw new Error(
'An http observable was completed twice. This shouldn\'t happen, please file a bug.');
}
savedError = err;
scheduled = false;
task.invoke();
},
() => {
if (!scheduled) {
throw new Error(
'An http observable was completed twice. This shouldn\'t happen, please file a bug.');
}
scheduled = false;
task.invoke();
});
};
const cancelTask = (_task: Task) => {
if (!scheduled) {
return;
}
scheduled = false;
if (sub) {
sub.unsubscribe();
sub = null;
}
};
const onComplete = () => {
if (savedError !== null) {
observer.error(savedError);
} else {
observer.next(savedResult);
observer.complete();
}
};
// MockBackend for Http is synchronous, which means that if scheduleTask is by
// scheduleMacroTask, the request will hit MockBackend and the response will be
// sent, causing task.invoke() to be called.
const _task = Zone.current.scheduleMacroTask(
'ZoneMacroTaskWrapper.subscribe', onComplete, {}, () => null, cancelTask);
scheduleTask(_task);
return () => {
if (scheduled && task) {
task.zone.cancelTask(task);
scheduled = false;
}
if (sub) {
sub.unsubscribe();
sub = null;
}
};
});
}
protected abstract delegate(request: S): Observable<R>;
}
export class ZoneMacroTaskConnection extends ZoneMacroTaskWrapper<Request, Response> implements
Connection {
response: Observable<Response>;
lastConnection: Connection;
constructor(public request: Request, private backend: XHRBackend) {
super();
validateRequestUrl(request.url);
this.response = this.wrap(request);
}
delegate(request: Request): Observable<Response> {
this.lastConnection = this.backend.createConnection(request);
return this.lastConnection.response as Observable<Response>;
}
get readyState(): ReadyState {
return !!this.lastConnection ? this.lastConnection.readyState : ReadyState.Unsent;
}
}
export class ZoneMacroTaskBackend implements ConnectionBackend {
constructor(private backend: XHRBackend) {}
createConnection(request: any): ZoneMacroTaskConnection {
return new ZoneMacroTaskConnection(request, this.backend);
}
}
export class ZoneClientBackend extends
ZoneMacroTaskWrapper<HttpRequest<any>, HttpEvent<any>> implements HttpBackend {
constructor(private backend: HttpBackend) { super(); }
handle(request: HttpRequest<any>): Observable<HttpEvent<any>> { return this.wrap(request); }
protected delegate(request: HttpRequest<any>): Observable<HttpEvent<any>> {
return this.backend.handle(request);
}
}
export function httpFactory(xhrBackend: XHRBackend, options: RequestOptions) {
const macroBackend = new ZoneMacroTaskBackend(xhrBackend);
return new Http(macroBackend, options);
}
export function zoneWrappedInterceptingHandler(
backend: HttpBackend, interceptors: HttpInterceptor[] | null) {
const realBackend: HttpBackend = interceptingHandler(backend, interceptors);
return new ZoneClientBackend(realBackend);
}
export const SERVER_HTTP_PROVIDERS: Provider[] = [
{provide: Http, useFactory: httpFactory, deps: [XHRBackend, RequestOptions]},
{provide: BrowserXhr, useClass: ServerXhr}, {provide: XSRFStrategy, useClass: ServerXsrfStrategy},
{provide: XhrFactory, useClass: ServerXhr}, {
provide: HttpHandler,
useFactory: zoneWrappedInterceptingHandler,
deps: [HttpBackend, [new Optional(), HTTP_INTERCEPTORS]]
}
];