110 lines
3.1 KiB
TypeScript
110 lines
3.1 KiB
TypeScript
/*
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This file is part of TALER
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(C) 2016 GNUnet e.V.
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* Helpers for doing XMLHttpRequest-s that are based on ES6 promises.
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* Allows for easy mocking for test cases.
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*/
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/**
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* An HTTP response that is returned by all request methods of this library.
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*/
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export interface HttpResponse {
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status: number;
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responseJson: object & any;
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}
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/**
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* The request library is bundled into an interface to make mocking easy.
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*/
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export interface HttpRequestLibrary {
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get(url: string): Promise<HttpResponse>;
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postJson(url: string, body: any): Promise<HttpResponse>;
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}
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/**
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* An implementation of the [[HttpRequestLibrary]] using the
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* browser's XMLHttpRequest.
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*/
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export class BrowserHttpLib implements HttpRequestLibrary {
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private req(
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method: string,
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url: string,
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options?: any,
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): Promise<HttpResponse> {
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return new Promise<HttpResponse>((resolve, reject) => {
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const myRequest = new XMLHttpRequest();
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myRequest.open(method, url);
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if (options && options.req) {
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myRequest.send(options.req);
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} else {
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myRequest.send();
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}
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myRequest.onerror = e => {
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console.error("http request error");
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reject(Error("could not make XMLHttpRequest"));
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};
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myRequest.addEventListener("readystatechange", e => {
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if (myRequest.readyState === XMLHttpRequest.DONE) {
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if (myRequest.status === 0) {
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reject(Error("HTTP Request failed (status code 0, maybe URI scheme is wrong?)"))
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return;
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}
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if (myRequest.status != 200) {
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reject(
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Error(
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`HTTP Response with unexpected status code ${myRequest.status}: ${myRequest.statusText}`,
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),
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);
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return;
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}
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let responseJson;
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try {
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responseJson = JSON.parse(myRequest.responseText);
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} catch (e) {
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reject(Error("Invalid JSON from HTTP response"));
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return;
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}
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if (responseJson === null || typeof responseJson !== "object") {
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reject(Error("Invalid JSON from HTTP response"));
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return;
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}
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const resp = {
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responseJson: responseJson,
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status: myRequest.status,
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};
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resolve(resp);
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}
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});
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});
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}
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get(url: string) {
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return this.req("get", url);
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}
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postJson(url: string, body: any) {
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return this.req("post", url, { req: JSON.stringify(body) });
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}
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postForm(url: string, form: any) {
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return this.req("post", url, { req: form });
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}
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}
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