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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, { AxiosResponse } from "axios";
import { OperationFailedError, makeErrorDetails } from "../operations/errors";
import { URL } from "../util/url";
import { Logger } from "../util/logging";
import { bytesToString } from "../crypto/talerCrypto";
import { TalerErrorCode } from "@gnu-taler/taler-util";
const logger = new Logger("NodeHttpLib.ts");
/**
* 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;
}
async fetch(url: string, opt?: HttpRequestOptions): Promise<HttpResponse> {
const method = opt?.method ?? "GET";
let body = opt?.body;
const parsedUrl = new URL(url);
if (this.throttlingEnabled && this.throttle.applyThrottle(url)) {
throw OperationFailedError.fromCode(
TalerErrorCode.WALLET_HTTP_REQUEST_THROTTLED,
`request to origin ${parsedUrl.origin} was throttled`,
{
requestMethod: method,
requestUrl: url,
throttleStats: this.throttle.getThrottleStats(url),
},
);
}
let timeout: number | undefined;
if (typeof opt?.timeout?.d_ms === "number") {
timeout = opt.timeout.d_ms;
}
let resp: AxiosResponse;
try {
resp = await Axios({
method,
url: url,
responseType: "arraybuffer",
headers: opt?.headers,
validateStatus: () => true,
transformResponse: (x) => x,
data: body,
timeout,
});
} catch (e) {
throw OperationFailedError.fromCode(
TalerErrorCode.WALLET_NETWORK_ERROR,
`${e.message}`,
{
requestUrl: url,
requestMethod: method,
},
);
}
const makeText = async (): Promise<string> => {
const respText = new Uint8Array(resp.data);
return bytesToString(respText);
};
const makeJson = async (): Promise<any> => {
let responseJson;
const respText = await makeText();
try {
responseJson = JSON.parse(respText);
} catch (e) {
logger.trace(`invalid json: '${resp.data}'`);
throw new OperationFailedError(
makeErrorDetails(
TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
"invalid JSON",
{
httpStatusCode: resp.status,
requestUrl: url,
requestMethod: method,
},
),
);
}
if (responseJson === null || typeof responseJson !== "object") {
logger.trace(`invalid json (not an object): '${respText}'`);
throw new OperationFailedError(
makeErrorDetails(
TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
"invalid JSON",
{
httpStatusCode: resp.status,
requestUrl: url,
requestMethod: method,
},
),
);
}
return responseJson;
};
const makeBytes = async () => {
if (typeof resp.data.byteLength !== "number") {
throw Error("expected array buffer");
}
const buf = resp.data;
return buf;
};
const headers = new Headers();
for (const hn of Object.keys(resp.headers)) {
headers.set(hn, resp.headers[hn]);
}
return {
requestUrl: url,
requestMethod: method,
headers,
status: resp.status,
text: makeText,
json: makeJson,
bytes: makeBytes,
};
}
async get(url: string, opt?: HttpRequestOptions): Promise<HttpResponse> {
return this.fetch(url, {
method: "GET",
...opt,
});
}
async postJson(
url: string,
body: any,
opt?: HttpRequestOptions,
): Promise<HttpResponse> {
return this.fetch(url, {
method: "POST",
body,
...opt,
});
}
}
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