151 lines
4.0 KiB
TypeScript
151 lines
4.0 KiB
TypeScript
/*
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This file is part of GNU Taler
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(C) 2020 Taler Systems S.A.
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GNU 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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GNU 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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GNU 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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* Imports.
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*/
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import { RequestThrottler, TalerErrorCode } from "@gnu-taler/taler-util";
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import {
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Headers,
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HttpRequestLibrary,
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HttpRequestOptions,
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HttpResponse,
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OperationFailedError,
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} from "@gnu-taler/taler-wallet-core";
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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 ServiceWorkerHttpLib implements HttpRequestLibrary {
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private throttle = new RequestThrottler();
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private throttlingEnabled = true;
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async fetch(
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requestUrl: string,
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options?: HttpRequestOptions,
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): Promise<HttpResponse> {
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const requestMethod = options?.method ?? "GET";
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const requestBody = options?.body;
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const requestHeader = options?.headers;
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if (this.throttlingEnabled && this.throttle.applyThrottle(requestUrl)) {
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const parsedUrl = new URL(requestUrl);
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throw OperationFailedError.fromCode(
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TalerErrorCode.WALLET_HTTP_REQUEST_THROTTLED,
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`request to origin ${parsedUrl.origin} was throttled`,
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{
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requestMethod,
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requestUrl,
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throttleStats: this.throttle.getThrottleStats(requestUrl),
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},
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);
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}
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const response = await fetch(requestUrl, {
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headers: requestHeader,
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body: requestBody,
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method: requestMethod,
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// timeout: options?.timeout
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});
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const headerMap = new Headers();
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response.headers.forEach((value, key) => {
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headerMap.set(key, value);
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});
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return {
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headers: headerMap,
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status: response.status,
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requestMethod,
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requestUrl,
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json: makeJsonHandler(response, requestUrl),
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text: makeTextHandler(response, requestUrl),
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bytes: async () => (await response.blob()).arrayBuffer(),
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};
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}
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get(url: string, opt?: HttpRequestOptions): Promise<HttpResponse> {
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return this.fetch(url, {
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method: "GET",
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...opt,
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});
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}
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postJson(
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url: string,
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body: any,
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opt?: HttpRequestOptions,
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): Promise<HttpResponse> {
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return this.fetch(url, {
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method: "POST",
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body: JSON.stringify(body),
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...opt,
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});
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}
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stop(): void {
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// Nothing to do
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}
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}
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function makeTextHandler(response: Response, requestUrl: string) {
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return async function getJsonFromResponse(): Promise<any> {
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let respText;
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try {
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respText = await response.text();
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} catch (e) {
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throw OperationFailedError.fromCode(
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TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
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"Invalid JSON from HTTP response",
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{
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requestUrl,
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httpStatusCode: response.status,
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},
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);
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}
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return respText;
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};
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}
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function makeJsonHandler(response: Response, requestUrl: string) {
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return async function getJsonFromResponse(): Promise<any> {
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let responseJson;
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try {
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responseJson = await response.json();
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} catch (e) {
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throw OperationFailedError.fromCode(
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TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
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"Invalid JSON from HTTP response",
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{
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requestUrl,
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httpStatusCode: response.status,
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},
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);
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}
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if (responseJson === null || typeof responseJson !== "object") {
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throw OperationFailedError.fromCode(
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TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
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"Invalid JSON from HTTP response",
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{
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requestUrl,
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httpStatusCode: response.status,
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},
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);
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}
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return responseJson;
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};
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}
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