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/*
This file is part of GNU Taler
(C) 2020 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 {
OperationFailedError,
Logger,
HttpRequestLibrary,
HttpRequestOptions,
HttpResponse,
Headers,
} from "taler-wallet-core";
import { TalerErrorCode } from "taler-wallet-core/lib/TalerErrorCode";
const logger = new Logger("browserHttpLib");
/**
* An implementation of the [[HttpRequestLibrary]] using the
* browser's XMLHttpRequest.
*/
export class BrowserHttpLib implements HttpRequestLibrary {
private req(
method: string,
url: string,
requestBody?: any,
options?: HttpRequestOptions,
): Promise<HttpResponse> {
return new Promise<HttpResponse>((resolve, reject) => {
const myRequest = new XMLHttpRequest();
myRequest.open(method, url);
if (options?.headers) {
for (const headerName in options.headers) {
myRequest.setRequestHeader(headerName, options.headers[headerName]);
}
}
myRequest.setRequestHeader;
if (requestBody) {
myRequest.send(requestBody);
} else {
myRequest.send();
}
myRequest.onerror = (e) => {
logger.error("http request error");
reject(
OperationFailedError.fromCode(
TalerErrorCode.WALLET_NETWORK_ERROR,
"Could not make request",
{
requestUrl: url,
},
),
);
};
myRequest.addEventListener("readystatechange", (e) => {
if (myRequest.readyState === XMLHttpRequest.DONE) {
if (myRequest.status === 0) {
const exc = OperationFailedError.fromCode(
TalerErrorCode.WALLET_NETWORK_ERROR,
"HTTP request failed (status 0, maybe URI scheme was wrong?)",
{
requestUrl: url,
},
);
reject(exc);
return;
}
const makeJson = async (): Promise<any> => {
let responseJson;
try {
responseJson = JSON.parse(myRequest.responseText);
} catch (e) {
throw OperationFailedError.fromCode(
TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
"Invalid JSON from HTTP response",
{
requestUrl: url,
httpStatusCode: myRequest.status,
},
);
}
if (responseJson === null || typeof responseJson !== "object") {
throw OperationFailedError.fromCode(
TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
"Invalid JSON from HTTP response",
{
requestUrl: url,
httpStatusCode: myRequest.status,
},
);
}
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: url,
status: myRequest.status,
headers: headerMap,
requestMethod: method,
json: makeJson,
text: async () => myRequest.responseText,
};
resolve(resp);
}
});
});
}
get(url: string, opt?: HttpRequestOptions): Promise<HttpResponse> {
return this.req("GET", url, undefined, opt);
}
postJson(
url: string,
body: unknown,
opt?: HttpRequestOptions,
): Promise<HttpResponse> {
return this.req("POST", url, JSON.stringify(body), opt);
}
stop(): void {
// Nothing to do
}
}
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