ethers.js/src.ts/utils/geturl-browser.ts
2022-11-04 18:08:37 -04:00

73 lines
2.0 KiB
TypeScript

import { assert } from "./errors.js";
import type { FetchRequest, FetchCancelSignal, GetUrlResponse } from "./fetch.js";
declare global {
class Headers {
constructor(values: Array<[ string, string ]>);
forEach(func: (v: string, k: string) => void): void;
}
class Response {
status: number;
statusText: string;
headers: Headers;
arrayBuffer(): Promise<ArrayBuffer>;
}
type FetchInit = {
method?: string,
headers?: Headers,
body?: Uint8Array
};
function fetch(url: string, init: FetchInit): Promise<Response>;
}
// @TODO: timeout is completely ignored; start a Promise.any with a reject?
export async function getUrl(req: FetchRequest, _signal?: FetchCancelSignal): Promise<GetUrlResponse> {
const protocol = req.url.split(":")[0].toLowerCase();
assert(protocol === "http" || protocol === "https", `unsupported protocol ${ protocol }`, "UNSUPPORTED_OPERATION", {
info: { protocol },
operation: "request"
});
assert(!req.credentials || req.allowInsecureAuthentication, "insecure authorized connections unsupported", "UNSUPPORTED_OPERATION", {
operation: "request"
});
let signal: undefined | AbortSignal = undefined;
if (_signal) {
const controller = new AbortController();
signal = controller.signal;
_signal.addListener(() => { controller.abort(); });
}
const init = {
method: req.method,
headers: new Headers(Array.from(req)),
body: req.body || undefined,
signal
};
const resp = await fetch(req.url, init);
const headers: Record<string, string> = { };
resp.headers.forEach((value, key) => {
headers[key.toLowerCase()] = value;
});
const respBody = await resp.arrayBuffer();
const body = (respBody == null) ? null: new Uint8Array(respBody);
return {
statusCode: resp.status,
statusMessage: resp.statusText,
headers, body
};
}