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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 {
HttpRequestLibrary,
HttpRequestOptions,
HttpResponse,
Headers,
TalerError,
} from "@gnu-taler/taler-wallet-core";
import {
Logger,
RequestThrottler,
stringToBytes,
TalerErrorCode,
} from "@gnu-taler/taler-util";
const logger = new Logger("browserHttpLib");
/**
* An implementation of the [[HttpRequestLibrary]] using the
* browser's XMLHttpRequest.
*/
export class BrowserHttpLib implements HttpRequestLibrary {
private throttle = new RequestThrottler();
private throttlingEnabled = true;
fetch(
requestUrl: string,
options?: HttpRequestOptions,
): Promise<HttpResponse> {
const requestMethod = options?.method ?? "GET";
const requestBody = options?.body;
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`,
);
}
return new Promise<HttpResponse>((resolve, reject) => {
const myRequest = new XMLHttpRequest();
myRequest.open(requestMethod, requestUrl);
if (options?.headers) {
for (const headerName in options.headers) {
myRequest.setRequestHeader(headerName, options.headers[headerName]);
}
}
myRequest.responseType = "arraybuffer";
if (requestBody) {
if (requestBody instanceof ArrayBuffer) {
myRequest.send(requestBody);
} else if (ArrayBuffer.isView(requestBody)) {
myRequest.send(requestBody);
} else if (typeof requestBody === "string") {
myRequest.send(requestBody);
} else {
myRequest.send(JSON.stringify(requestBody));
}
} else {
myRequest.send();
}
myRequest.onerror = (e) => {
logger.error("http request error");
reject(
TalerError.fromDetail(
TalerErrorCode.WALLET_NETWORK_ERROR,
{
requestUrl,
requestMethod,
},
"Could not make request",
),
);
};
myRequest.addEventListener("readystatechange", (e) => {
if (myRequest.readyState === XMLHttpRequest.DONE) {
if (myRequest.status === 0) {
const exc = TalerError.fromDetail(
TalerErrorCode.WALLET_NETWORK_ERROR,
{
requestUrl,
requestMethod,
},
"HTTP request failed (status 0, maybe URI scheme was wrong?)",
);
reject(exc);
return;
}
const makeText = async (): Promise<string> => {
const td = new TextDecoder();
return td.decode(myRequest.response);
};
const makeJson = async (): Promise<any> => {
let responseJson;
try {
const td = new TextDecoder();
const responseString = td.decode(myRequest.response);
responseJson = JSON.parse(responseString);
} catch (e) {
throw TalerError.fromDetail(
TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
{
requestUrl,
requestMethod,
httpStatusCode: myRequest.status,
},
"Invalid JSON from HTTP response",
);
}
if (responseJson === null || typeof responseJson !== "object") {
throw TalerError.fromDetail(
TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
{
requestUrl,
requestMethod,
httpStatusCode: myRequest.status,
},
"Invalid JSON from HTTP response",
);
}
return responseJson;
};
const headers = myRequest.getAllResponseHeaders();
const arr = headers.trim().split(/[\r\n]+/);
// Create a map of header names to values
const headerMap: Headers = new Headers();
arr.forEach(function (line) {
const parts = line.split(": ");
const headerName = parts.shift();
if (!headerName) {
logger.warn("skipping invalid header");
return;
}
const value = parts.join(": ");
headerMap.set(headerName, value);
});
const resp: HttpResponse = {
requestUrl: requestUrl,
status: myRequest.status,
headers: headerMap,
requestMethod: requestMethod,
json: makeJson,
text: makeText,
bytes: async () => myRequest.response,
};
resolve(resp);
}
});
});
}
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
}
}
|
