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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
*/
import {Injectable} from '@angular/core';
import {Observable} from 'rxjs/Observable';
import {BaseRequestOptions, RequestOptions} from './base_request_options';
import {RequestMethod} from './enums';
import {ConnectionBackend, RequestOptionsArgs} from './interfaces';
import {Request} from './static_request';
import {Response} from './static_response';
function httpRequest(backend: ConnectionBackend, request: Request): Observable<Response> {
return backend.createConnection(request).response;
}
function mergeOptions(
defaultOpts: BaseRequestOptions, providedOpts: RequestOptionsArgs, method: RequestMethod,
url: string): RequestOptions {
const newOptions = defaultOpts;
if (providedOpts) {
// Hack so Dart can used named parameters
return newOptions.merge(new RequestOptions({
method: providedOpts.method || method,
url: providedOpts.url || url,
search: providedOpts.search,
headers: providedOpts.headers,
body: providedOpts.body,
withCredentials: providedOpts.withCredentials,
responseType: providedOpts.responseType
}));
}
return newOptions.merge(new RequestOptions({method, url}));
}
/**
* Performs http requests using `XMLHttpRequest` as the default backend.
*
* `Http` is available as an injectable class, with methods to perform http requests. Calling
* `request` returns an `Observable` which will emit a single {@link Response} when a
* response is received.
*
* ### Example
*
* ```typescript
* import {Http, HTTP_PROVIDERS} from '@angular/http';
* import 'rxjs/add/operator/map'
* @Component({
* selector: 'http-app',
* viewProviders: [HTTP_PROVIDERS],
* templateUrl: 'people.html'
* })
* class PeopleComponent {
* constructor(http: Http) {
* http.get('people.json')
* // Call map on the response observable to get the parsed people object
* .map(res => res.json())
* // Subscribe to the observable to get the parsed people object and attach it to the
* // component
* .subscribe(people => this.people = people);
* }
* }
* ```
*
*
* ### Example
*
* ```
* http.get('people.json').subscribe((res:Response) => this.people = res.json());
* ```
*
* The default construct used to perform requests, `XMLHttpRequest`, is abstracted as a "Backend" (
* {@link XHRBackend} in this case), which could be mocked with dependency injection by replacing
* the {@link XHRBackend} provider, as in the following example:
*
* ### Example
*
* ```typescript
* import {BaseRequestOptions, Http} from '@angular/http';
* import {MockBackend} from '@angular/http/testing';
* var injector = Injector.resolveAndCreate([
* BaseRequestOptions,
* MockBackend,
* {provide: Http, useFactory:
* function(backend, defaultOptions) {
* return new Http(backend, defaultOptions);
* },
* deps: [MockBackend, BaseRequestOptions]}
* ]);
* var http = injector.get(Http);
* http.get('request-from-mock-backend.json').subscribe((res:Response) => doSomething(res));
* ```
*
* @experimental
*/
@Injectable()
export class Http {
constructor(protected _backend: ConnectionBackend, protected _defaultOptions: RequestOptions) {}
/**
* Performs any type of http request. First argument is required, and can either be a url or
* a {@link Request} instance. If the first argument is a url, an optional {@link RequestOptions}
* object can be provided as the 2nd argument. The options object will be merged with the values
* of {@link BaseRequestOptions} before performing the request.
*/
request(url: string|Request, options?: RequestOptionsArgs): Observable<Response> {
let responseObservable: any;
if (typeof url === 'string') {
responseObservable = httpRequest(
this._backend,
new Request(mergeOptions(this._defaultOptions, options, RequestMethod.Get, <string>url)));
} else if (url instanceof Request) {
responseObservable = httpRequest(this._backend, url);
} else {
throw new Error('First argument must be a url string or Request instance.');
}
return responseObservable;
}
/**
* Performs a request with `get` http method.
*/
get(url: string, options?: RequestOptionsArgs): Observable<Response> {
return this.request(
new Request(mergeOptions(this._defaultOptions, options, RequestMethod.Get, url)));
}
/**
* Performs a request with `post` http method.
*/
post(url: string, body: any, options?: RequestOptionsArgs): Observable<Response> {
return this.request(new Request(mergeOptions(
this._defaultOptions.merge(new RequestOptions({body: body})), options, RequestMethod.Post,
url)));
}
/**
* Performs a request with `put` http method.
*/
put(url: string, body: any, options?: RequestOptionsArgs): Observable<Response> {
return this.request(new Request(mergeOptions(
this._defaultOptions.merge(new RequestOptions({body: body})), options, RequestMethod.Put,
url)));
}
/**
* Performs a request with `delete` http method.
*/
delete (url: string, options?: RequestOptionsArgs): Observable<Response> {
return this.request(
new Request(mergeOptions(this._defaultOptions, options, RequestMethod.Delete, url)));
}
/**
* Performs a request with `patch` http method.
*/
patch(url: string, body: any, options?: RequestOptionsArgs): Observable<Response> {
return this.request(new Request(mergeOptions(
this._defaultOptions.merge(new RequestOptions({body: body})), options, RequestMethod.Patch,
url)));
}
/**
* Performs a request with `head` http method.
*/
head(url: string, options?: RequestOptionsArgs): Observable<Response> {
return this.request(
new Request(mergeOptions(this._defaultOptions, options, RequestMethod.Head, url)));
}
/**
* Performs a request with `options` http method.
*/
options(url: string, options?: RequestOptionsArgs): Observable<Response> {
return this.request(
new Request(mergeOptions(this._defaultOptions, options, RequestMethod.Options, url)));
}
}
/**
* @experimental
*/
@Injectable()
export class Jsonp extends Http {
constructor(backend: ConnectionBackend, defaultOptions: RequestOptions) {
super(backend, defaultOptions);
}
/**
* Performs any type of http request. First argument is required, and can either be a url or
* a {@link Request} instance. If the first argument is a url, an optional {@link RequestOptions}
* object can be provided as the 2nd argument. The options object will be merged with the values
* of {@link BaseRequestOptions} before performing the request.
*
* @security Regular XHR is the safest alternative to JSONP for most applications, and is
* supported by all current browsers. Because JSONP creates a `<script>` element with
* contents retrieved from a remote source, attacker-controlled data introduced by an untrusted
* source could expose your application to XSS risks. Data exposed by JSONP may also be
* readable by malicious third-party websites. In addition, JSONP introduces potential risk for
* future security issues (e.g. content sniffing). For more detail, see the
* [Security Guide](http://g.co/ng/security).
*/
request(url: string|Request, options?: RequestOptionsArgs): Observable<Response> {
let responseObservable: any;
if (typeof url === 'string') {
url =
new Request(mergeOptions(this._defaultOptions, options, RequestMethod.Get, <string>url));
}
if (url instanceof Request) {
if (url.method !== RequestMethod.Get) {
throw new Error('JSONP requests must use GET request method.');
}
responseObservable = httpRequest(this._backend, url);
} else {
throw new Error('First argument must be a url string or Request instance.');
}
return responseObservable;
}
}