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/*
This file is part of GNU Taler
(C) 2019 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* Imports.
*/
import {
Headers,
HttpRequestLibrary,
HttpRequestOptions,
HttpResponse,
} from "../util/http";
import { RequestThrottler } from "../util/RequestThrottler";
import Axios from "axios";
/**
* Implementation of the HTTP request library interface for node.
*/
export class NodeHttpLib implements HttpRequestLibrary {
private throttle = new RequestThrottler();
private throttlingEnabled = true;
/**
* Set whether requests should be throttled.
*/
setThrottling(enabled: boolean): void {
this.throttlingEnabled = enabled;
}
private async req(
method: "post" | "get",
url: string,
body: any,
opt?: HttpRequestOptions,
): Promise<HttpResponse> {
if (this.throttlingEnabled && this.throttle.applyThrottle(url)) {
throw Error("request throttled");
}
const resp = await Axios({
method,
url: url,
responseType: "text",
headers: opt?.headers,
validateStatus: () => true,
transformResponse: (x) => x,
data: body,
});
const respText = resp.data;
if (typeof respText !== "string") {
throw Error("unexpected response type");
}
const makeJson = async (): Promise<any> => {
let responseJson;
try {
responseJson = JSON.parse(respText);
} catch (e) {
throw Error("Invalid JSON from HTTP response");
}
if (responseJson === null || typeof responseJson !== "object") {
throw Error("Invalid JSON from HTTP response");
}
return responseJson;
};
const headers = new Headers();
for (const hn of Object.keys(resp.headers)) {
headers.set(hn, resp.headers[hn]);
}
return {
headers,
status: resp.status,
text: async () => resp.data,
json: makeJson,
};
}
async get(url: string, opt?: HttpRequestOptions): Promise<HttpResponse> {
return this.req("get", url, undefined, opt);
}
async postJson(
url: string,
body: any,
opt?: HttpRequestOptions,
): Promise<HttpResponse> {
return this.req("post", url, body, opt);
}
}
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