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fetch.js
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fetch.js
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import { once } from "events";
import multipart from "parse-multipart-data";
import { splitCookiesString } from "set-cookie-parser";
import { Readable } from "stream";
import { File, FormData, Headers, Request as BaseNodeRequest } from "undici";
function nodeToWeb(nodeStream) {
var destroyed = false;
var listeners = {};
function start(controller) {
listeners["data"] = onData;
listeners["end"] = onData;
listeners["end"] = onDestroy;
listeners["close"] = onDestroy;
listeners["error"] = onDestroy;
for (var name in listeners) nodeStream.on(name, listeners[name]);
nodeStream.pause();
function onData(chunk) {
if (destroyed) return;
controller.enqueue(chunk);
nodeStream.pause();
}
function onDestroy(err) {
if (destroyed) return;
destroyed = true;
for (var name in listeners) nodeStream.removeListener(name, listeners[name]);
if (err) controller.error(err);
else controller.close();
}
}
function pull() {
if (destroyed) return;
nodeStream.resume();
}
function cancel() {
destroyed = true;
for (var name in listeners) nodeStream.removeListener(name, listeners[name]);
nodeStream.push(null);
nodeStream.pause();
if (nodeStream.destroy) nodeStream.destroy();
else if (nodeStream.close) nodeStream.close();
}
return new ReadableStream({ start: start, pull: pull, cancel: cancel });
}
function createHeaders(requestHeaders) {
let headers = new Headers();
for (let [key, values] of Object.entries(requestHeaders)) {
if (values) {
if (Array.isArray(values)) {
for (const value of values) {
headers.append(key, value);
}
} else {
headers.set(key, values);
}
}
}
return headers;
}
class NodeRequest extends BaseNodeRequest {
constructor(input, init) {
if (init && init.data && init.data.on) {
init = {
duplex: "half",
...init,
body: init.data.headers["content-type"]?.includes("x-www")
? init.data
: nodeToWeb(init.data)
};
}
super(input, init);
}
// async json() {
// return JSON.parse(await this.text());
// }
async buffer() {
return Buffer.from(await super.arrayBuffer());
}
// async text() {
// return (await this.buffer()).toString();
// }
// @ts-ignore
async formData() {
if (this.headers.get("content-type") === "application/x-www-form-urlencoded") {
return await super.formData();
} else {
const data = await this.buffer();
const input = multipart.parse(
data,
this.headers.get("content-type").replace("multipart/form-data; boundary=", "")
);
const form = new FormData();
input.forEach(({ name, data, filename, type }) => {
// file fields have Content-Type set,
// whereas non-file fields must not
// https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#multipart-form-data
const isFile = type !== undefined;
if (isFile) {
const value = new File([data], filename, { type });
form.append(name, value, filename);
} else {
const value = data.toString("utf-8");
form.append(name, value);
}
});
return form;
}
}
// @ts-ignore
clone() {
/** @type {BaseNodeRequest & { buffer?: () => Promise<Buffer>; formData?: () => Promise<FormData> }} */
let el = super.clone();
el.buffer = this.buffer.bind(el);
el.formData = this.formData.bind(el);
return el;
}
}
export function createRequest(req) {
let origin = req.headers.origin || `http://${req.headers.host}`;
let url = new URL(req.url, origin);
let init = {
method: req.method,
headers: createHeaders(req.headers),
// POST, PUT, & PATCH will be read as body by NodeRequest
data: req.method.indexOf("P") === 0 ? req : null
};
return new NodeRequest(url.href, init);
}
export async function handleNodeResponse(webRes, res) {
res.statusCode = webRes.status;
res.statusMessage = webRes.statusText;
for (const [name, value] of webRes.headers) {
if (name === "set-cookie") {
res.setHeader(name, splitCookiesString(value));
} else res.setHeader(name, value);
}
if (webRes.body) {
const readable = Readable.from(webRes.body);
readable.pipe(res);
await once(readable, "end");
} else {
res.end();
}
}
export { splitCookiesString };