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/*
This file is part of GNU Taler
(C) 2022 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/>
*/
/**
* Imports.
*/
import {
RequestThrottler,
TalerErrorCode,
TalerError,
Duration,
} from "@gnu-taler/taler-util";
import {
DEFAULT_REQUEST_TIMEOUT_MS,
Headers,
HttpRequestLibrary,
HttpRequestOptions,
HttpResponse,
encodeBody,
getDefaultHeaders,
} from "@gnu-taler/taler-util/http";
/**
* An implementation of the [[HttpRequestLibrary]] using the
* browser's XMLHttpRequest.
*/
export class ServiceWorkerHttpLib implements HttpRequestLibrary {
private throttle = new RequestThrottler();
private throttlingEnabled = true;
async fetch(
requestUrl: string,
options?: HttpRequestOptions,
): Promise<HttpResponse> {
const requestMethod = options?.method ?? "GET";
const requestBody = options?.body;
const requestHeader = options?.headers;
const requestTimeout =
options?.timeout ?? Duration.fromMilliseconds(DEFAULT_REQUEST_TIMEOUT_MS);
if (this.throttlingEnabled && this.throttle.applyThrottle(requestUrl)) {
const parsedUrl = new URL(requestUrl);
throw TalerError.fromDetail(
TalerErrorCode.WALLET_HTTP_REQUEST_THROTTLED,
{
requestMethod,
requestUrl,
throttleStats: this.throttle.getThrottleStats(requestUrl),
},
`request to origin ${parsedUrl.origin} was throttled`,
);
}
let myBody: ArrayBuffer | undefined =
requestMethod === "POST" ? encodeBody(requestBody) : undefined;
const requestHeadersMap = {
...getDefaultHeaders(requestMethod),
...requestHeader,
};
const controller = new AbortController();
let timeoutId: any | undefined;
if (requestTimeout.d_ms !== "forever") {
timeoutId = setTimeout(() => {
controller.abort(TalerErrorCode.WALLET_HTTP_REQUEST_GENERIC_TIMEOUT);
}, requestTimeout.d_ms);
}
try {
const response = await fetch(requestUrl, {
headers: requestHeadersMap,
body: myBody,
method: requestMethod,
signal: controller.signal,
});
if (timeoutId) {
clearTimeout(timeoutId);
}
const headerMap = new Headers();
response.headers.forEach((value, key) => {
headerMap.set(key, value);
});
return {
headers: headerMap,
status: response.status,
requestMethod,
requestUrl,
json: makeJsonHandler(response, requestUrl, requestMethod),
text: makeTextHandler(response, requestUrl, requestMethod),
bytes: async () => (await response.blob()).arrayBuffer(),
};
} catch (e) {
if (controller.signal) {
throw TalerError.fromDetail(
controller.signal.reason,
{},
`request to ${requestUrl} timed out`,
);
}
throw e;
}
}
get(url: string, opt?: HttpRequestOptions): Promise<HttpResponse> {
return this.fetch(url, {
method: "GET",
...opt,
});
}
postJson(
url: string,
body: any,
opt?: HttpRequestOptions,
): Promise<HttpResponse> {
return this.fetch(url, {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify(body),
...opt,
});
}
stop(): void {
// Nothing to do
}
}
function makeTextHandler(
response: Response,
requestUrl: string,
requestMethod: string,
) {
return async function getJsonFromResponse(): Promise<any> {
let respText;
try {
respText = await response.text();
} catch (e) {
throw TalerError.fromDetail(
TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
{
requestUrl,
requestMethod,
httpStatusCode: response.status,
},
"Invalid JSON from HTTP response",
);
}
return respText;
};
}
function makeJsonHandler(
response: Response,
requestUrl: string,
requestMethod: string,
) {
return async function getJsonFromResponse(): Promise<any> {
let responseJson;
try {
responseJson = await response.json();
} catch (e) {
throw TalerError.fromDetail(
TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
{
requestUrl,
requestMethod,
httpStatusCode: response.status,
},
"Invalid JSON from HTTP response",
);
}
if (responseJson === null || typeof responseJson !== "object") {
throw TalerError.fromDetail(
TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
{
requestUrl,
requestMethod,
httpStatusCode: response.status,
},
"Invalid JSON from HTTP response",
);
}
return responseJson;
};
}
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