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index.js
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index.js
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import * as set_cookie_parser from 'set-cookie-parser';
import { error } from '../index.js';
/**
* @param {import('http').IncomingMessage} req
* @param {number} [body_size_limit]
*/
function get_raw_body(req, body_size_limit) {
const h = req.headers;
if (!h['content-type']) {
return null;
}
const content_length = Number(h['content-length']);
// check if no request body
if (
(req.httpVersionMajor === 1 && isNaN(content_length) && h['transfer-encoding'] == null) ||
content_length === 0
) {
return null;
}
let length = content_length;
if (body_size_limit) {
if (!length) {
length = body_size_limit;
} else if (length > body_size_limit) {
throw error(
413,
`Received content-length of ${length}, but only accept up to ${body_size_limit} bytes.`
);
}
}
if (req.destroyed) {
const readable = new ReadableStream();
readable.cancel();
return readable;
}
let size = 0;
let cancelled = false;
return new ReadableStream({
start(controller) {
req.on('error', (error) => {
cancelled = true;
controller.error(error);
});
req.on('end', () => {
if (cancelled) return;
controller.close();
});
req.on('data', (chunk) => {
if (cancelled) return;
size += chunk.length;
if (size > length) {
cancelled = true;
controller.error(
error(
413,
`request body size exceeded ${
content_length ? "'content-length'" : 'BODY_SIZE_LIMIT'
} of ${length}`
)
);
return;
}
controller.enqueue(chunk);
if (controller.desiredSize === null || controller.desiredSize <= 0) {
req.pause();
}
});
},
pull() {
req.resume();
},
cancel(reason) {
cancelled = true;
req.destroy(reason);
}
});
}
/**
* @param {{
* request: import('http').IncomingMessage;
* base: string;
* bodySizeLimit?: number;
* }} options
* @returns {Promise<Request>}
*/
export async function getRequest({ request, base, bodySizeLimit }) {
return new Request(base + request.url, {
// @ts-expect-error
duplex: 'half',
method: request.method,
headers: /** @type {Record<string, string>} */ (request.headers),
body: get_raw_body(request, bodySizeLimit)
});
}
/**
* @param {import('http').ServerResponse} res
* @param {Response} response
* @returns {Promise<void>}
*/
export async function setResponse(res, response) {
for (const [key, value] of response.headers) {
try {
res.setHeader(
key,
key === 'set-cookie'
? set_cookie_parser.splitCookiesString(
// This is absurd but necessary, TODO: investigate why
/** @type {string}*/ (response.headers.get(key))
)
: value
);
} catch (error) {
res.getHeaderNames().forEach((name) => res.removeHeader(name));
res.writeHead(500).end(String(error));
return;
}
}
res.writeHead(response.status);
if (!response.body) {
res.end();
return;
}
if (response.body.locked) {
res.end(
'Fatal error: Response body is locked. ' +
"This can happen when the response was already read (for example through 'response.json()' or 'response.text()')."
);
return;
}
const reader = response.body.getReader();
if (res.destroyed) {
reader.cancel();
return;
}
const cancel = (/** @type {Error|undefined} */ error) => {
res.off('close', cancel);
res.off('error', cancel);
// If the reader has already been interrupted with an error earlier,
// then it will appear here, it is useless, but it needs to be catch.
reader.cancel(error).catch(() => {});
if (error) res.destroy(error);
};
res.on('close', cancel);
res.on('error', cancel);
next();
async function next() {
try {
for (;;) {
const { done, value } = await reader.read();
if (done) break;
if (!res.write(value)) {
res.once('drain', next);
return;
}
}
res.end();
} catch (error) {
cancel(error instanceof Error ? error : new Error(String(error)));
}
}
}