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/*
This file is part of TALER
(C) 2016 GNUnet e.V.
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.
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
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* Helpers for doing XMLHttpRequest-s that are based on ES6 promises.
* Allows for easy mocking for test cases.
*/
/**
* An HTTP response that is returned by all request methods of this library.
*/
export interface HttpResponse {
status: number;
responseJson: object & any;
}
/**
* The request library is bundled into an interface to make mocking easy.
*/
export interface HttpRequestLibrary {
get(url: string): Promise<HttpResponse>;
postJson(url: string, body: any): Promise<HttpResponse>;
}
/**
* An implementation of the [[HttpRequestLibrary]] using the
* browser's XMLHttpRequest.
*/
export class BrowserHttpLib implements HttpRequestLibrary {
private req(
method: string,
url: string,
options?: any,
): Promise<HttpResponse> {
return new Promise<HttpResponse>((resolve, reject) => {
const myRequest = new XMLHttpRequest();
myRequest.open(method, url);
if (options && options.req) {
myRequest.send(options.req);
} else {
myRequest.send();
}
myRequest.onerror = e => {
console.error("http request error");
reject(Error("could not make XMLHttpRequest"));
};
myRequest.addEventListener("readystatechange", e => {
if (myRequest.readyState === XMLHttpRequest.DONE) {
if (myRequest.status === 0) {
reject(Error("HTTP Request failed (status code 0, maybe URI scheme is wrong?)"))
return;
}
if (myRequest.status != 200) {
reject(
Error(
`HTTP Response with unexpected status code ${myRequest.status}: ${myRequest.statusText}`,
),
);
return;
}
let responseJson;
try {
responseJson = JSON.parse(myRequest.responseText);
} catch (e) {
reject(Error("Invalid JSON from HTTP response"));
return;
}
if (responseJson === null || typeof responseJson !== "object") {
reject(Error("Invalid JSON from HTTP response"));
return;
}
const resp = {
responseJson: responseJson,
status: myRequest.status,
};
resolve(resp);
}
});
});
}
get(url: string) {
return this.req("get", url);
}
postJson(url: string, body: any) {
return this.req("post", url, { req: JSON.stringify(body) });
}
postForm(url: string, form: any) {
return this.req("post", url, { req: form });
}
}
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