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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.uServer = void 0;
const debug_1 = require("debug");
const server_1 = require("./server");
const transports_uws_1 = require("./transports-uws");
const debug = (0, debug_1.default)("engine:uws");
class uServer extends server_1.BaseServer {
init() { }
cleanup() { }
/**
* Prepares a request by processing the query string.
*
* @api private
*/
prepare(req, res) {
req.method = req.getMethod().toUpperCase();
req.url = req.getUrl();
const params = new URLSearchParams(req.getQuery());
req._query = Object.fromEntries(params.entries());
req.headers = {};
req.forEach((key, value) => {
req.headers[key] = value;
});
req.connection = {
remoteAddress: Buffer.from(res.getRemoteAddressAsText()).toString(),
};
res.onAborted(() => {
debug("response has been aborted");
});
}
createTransport(transportName, req) {
return new transports_uws_1.default[transportName](req);
}
/**
* Attach the engine to a µWebSockets.js server
* @param app
* @param options
*/
attach(app /* : TemplatedApp */, options = {}) {
const path = this._computePath(options);
app
.any(path, this.handleRequest.bind(this))
//
.ws(path, {
compression: options.compression,
idleTimeout: options.idleTimeout,
maxBackpressure: options.maxBackpressure,
maxPayloadLength: this.opts.maxHttpBufferSize,
upgrade: this.handleUpgrade.bind(this),
open: (ws) => {
const transport = ws.getUserData().transport;
transport.socket = ws;
transport.writable = true;
transport.emit("drain");
},
message: (ws, message, isBinary) => {
ws.getUserData().transport.onData(isBinary ? message : Buffer.from(message).toString());
},
close: (ws, code, message) => {
ws.getUserData().transport.onClose(code, message);
},
});
}
_applyMiddlewares(req, res, callback) {
if (this.middlewares.length === 0) {
return callback();
}
// needed to buffer headers until the status is computed
req.res = new ResponseWrapper(res);
super._applyMiddlewares(req, req.res, (err) => {
// some middlewares (like express-session) wait for the writeHead() call to flush their headers
// see https://github.com/expressjs/session/blob/1010fadc2f071ddf2add94235d72224cf65159c6/index.js#L220-L244
req.res.writeHead();
callback(err);
});
}
handleRequest(res, req) {
debug('handling "%s" http request "%s"', req.getMethod(), req.getUrl());
this.prepare(req, res);
req.res = res;
const callback = (errorCode, errorContext) => {
if (errorCode !== undefined) {
this.emit("connection_error", {
req,
code: errorCode,
message: server_1.Server.errorMessages[errorCode],
context: errorContext,
});
this.abortRequest(req.res, errorCode, errorContext);
return;
}
if (req._query.sid) {
debug("setting new request for existing client");
this.clients[req._query.sid].transport.onRequest(req);
}
else {
const closeConnection = (errorCode, errorContext) => this.abortRequest(res, errorCode, errorContext);
this.handshake(req._query.transport, req, closeConnection);
}
};
this._applyMiddlewares(req, res, (err) => {
if (err) {
callback(server_1.Server.errors.BAD_REQUEST, { name: "MIDDLEWARE_FAILURE" });
}
else {
this.verify(req, false, callback);
}
});
}
handleUpgrade(res, req, context) {
debug("on upgrade");
this.prepare(req, res);
req.res = res;
const callback = async (errorCode, errorContext) => {
if (errorCode !== undefined) {
this.emit("connection_error", {
req,
code: errorCode,
message: server_1.Server.errorMessages[errorCode],
context: errorContext,
});
this.abortRequest(res, errorCode, errorContext);
return;
}
const id = req._query.sid;
let transport;
if (id) {
const client = this.clients[id];
if (!client) {
debug("upgrade attempt for closed client");
res.close();
}
else if (client.upgrading) {
debug("transport has already been trying to upgrade");
res.close();
}
else if (client.upgraded) {
debug("transport had already been upgraded");
res.close();
}
else {
debug("upgrading existing transport");
transport = this.createTransport(req._query.transport, req);
client.maybeUpgrade(transport);
}
}
else {
transport = await this.handshake(req._query.transport, req, (errorCode, errorContext) => this.abortRequest(res, errorCode, errorContext));
if (!transport) {
return;
}
}
// calling writeStatus() triggers the flushing of any header added in a middleware
req.res.writeStatus("101 Switching Protocols");
res.upgrade({
transport,
}, req.getHeader("sec-websocket-key"), req.getHeader("sec-websocket-protocol"), req.getHeader("sec-websocket-extensions"), context);
};
this._applyMiddlewares(req, res, (err) => {
if (err) {
callback(server_1.Server.errors.BAD_REQUEST, { name: "MIDDLEWARE_FAILURE" });
}
else {
this.verify(req, true, callback);
}
});
}
abortRequest(res, errorCode, errorContext) {
const statusCode = errorCode === server_1.Server.errors.FORBIDDEN
? "403 Forbidden"
: "400 Bad Request";
const message = errorContext && errorContext.message
? errorContext.message
: server_1.Server.errorMessages[errorCode];
res.writeStatus(statusCode);
res.writeHeader("Content-Type", "application/json");
res.end(JSON.stringify({
code: errorCode,
message,
}));
}
}
exports.uServer = uServer;
class ResponseWrapper {
constructor(res) {
this.res = res;
this.statusWritten = false;
this.headers = [];
this.isAborted = false;
}
set statusCode(status) {
if (!status) {
return;
}
// FIXME: handle all status codes?
this.writeStatus(status === 200 ? "200 OK" : "204 No Content");
}
writeHead(status) {
this.statusCode = status;
}
setHeader(key, value) {
if (Array.isArray(value)) {
value.forEach((val) => {
this.writeHeader(key, val);
});
}
else {
this.writeHeader(key, value);
}
}
removeHeader() {
// FIXME: not implemented
}
// needed by vary: https://github.com/jshttp/vary/blob/5d725d059b3871025cf753e9dfa08924d0bcfa8f/index.js#L134
getHeader() { }
writeStatus(status) {
if (this.isAborted)
return;
this.res.writeStatus(status);
this.statusWritten = true;
this.writeBufferedHeaders();
return this;
}
writeHeader(key, value) {
if (this.isAborted)
return;
if (key === "Content-Length") {
// the content length is automatically added by uWebSockets.js
return;
}
if (this.statusWritten) {
this.res.writeHeader(key, value);
}
else {
this.headers.push([key, value]);
}
}
writeBufferedHeaders() {
this.headers.forEach(([key, value]) => {
this.res.writeHeader(key, value);
});
}
end(data) {
if (this.isAborted)
return;
this.res.cork(() => {
if (!this.statusWritten) {
// status will be inferred as "200 OK"
this.writeBufferedHeaders();
}
this.res.end(data);
});
}
onData(fn) {
if (this.isAborted)
return;
this.res.onData(fn);
}
onAborted(fn) {
if (this.isAborted)
return;
this.res.onAborted(() => {
// Any attempt to use the UWS response object after abort will throw!
this.isAborted = true;
fn();
});
}
cork(fn) {
if (this.isAborted)
return;
this.res.cork(fn);
}
}
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