@cldn/web-ts
Version:
Class-based Node.js web server
186 lines • 15.9 kB
JavaScript
import { SubnetList } from "@cldn/ip";
import EventEmitter from "node:events";
import http from "node:http";
import packageJson from "./package.json" with { type: "json" };
import { Request } from "./Request.js";
import { EmptyResponse } from "./response/index.js";
import { ThrowableResponse } from "./response/ThrowableResponse.js";
import { RouteRegistry } from "./routing/RouteRegistry.js";
import { ServerErrorRegistry } from "./ServerErrorRegistry.js";
/**
* An HTTP server.
* @see {@link Server.Events} for events.
*/
class Server extends EventEmitter {
/**
* Headers sent with every response.
*/
globalHeaders;
/**
* This server's route registry.
*/
routes = new RouteRegistry();
/** @internal */
_authenticators;
/**
* This server's error registry.
*/
errors = new ServerErrorRegistry();
server;
port;
copyOrigin;
handleConditionalRequests;
/**
* The network of remote addresses of proxies to trust.
*/
trustedProxies;
/**
* Create a new HTTP server.
* @param options Server options.
*/
constructor(options) {
super();
this.server = http.createServer({
joinDuplicateHeaders: true,
}, this.listener.bind(this));
this.globalHeaders = new Headers(options?.globalHeaders);
if (!this.globalHeaders.has("server"))
this.globalHeaders.set("Server", `${packageJson.name}/${packageJson.version}`);
this.port = options?.port;
this.copyOrigin = options?.copyOrigin ?? false;
this.handleConditionalRequests = options?.handleConditionalRequests ?? true;
this._authenticators = options?.authenticators ?? [];
this.trustedProxies = options?.trustedProxies ?? new SubnetList();
if (this.port !== undefined)
this.listen(this.port).then();
this.once("listening", () => {
if (this.listenerCount("error") === 0)
this.on("error", e => console.error("Internal Server Error:", e));
});
}
/** @internal **/
get _keepAliveTimeout() {
return this.server.keepAliveTimeout;
}
/**
* Close the server. Will stop accepting new connections and wait for existing connections to close.
* @param [timeout=5000] Maximum time to wait for existing connections to close before forcibly closing them.
*/
async close(timeout = 5000) {
if (!this.server.listening)
throw new Error("Server is not listening.");
this.emit("closing");
let timeoutId;
await Promise.race([
new Promise(resolve => {
timeoutId = setTimeout(() => {
this.server.closeAllConnections();
resolve();
}, timeout);
}),
new Promise(resolve => {
clearTimeout(timeoutId);
this.server.close(() => resolve());
}),
]);
this.emit("closed");
}
/**
* Start listening for connections.
* @param port The HTTP listener port. From 1 to 65535. Ports 1–1023 require privileges.
*/
listen(port) {
if (this.server.listening)
throw new Error("Server is already listening.");
return new Promise(resolve => {
this.server.listen(port, process.env.HOST, () => {
this.emit("listening", port, process.env.HOST);
resolve();
});
});
}
async listener(req, res) {
let apiRequest;
try {
apiRequest = Request.incomingMessage(req, this);
}
catch (e) {
if (e instanceof Request.BadUrlError) {
await this.errors._get(0 /* ServerErrorRegistry.ErrorCodes.BAD_URL */, null)._send(res);
return;
}
if (e instanceof Request.SocketClosedError)
return;
this.emit("error", e);
await this.errors._get(2 /* ServerErrorRegistry.ErrorCodes.INTERNAL */, null)._send(res);
return;
}
for (const [key, value] of this.globalHeaders)
apiRequest._responseHeaders.set(key, value);
if (this.copyOrigin) {
apiRequest._responseHeaders.set("access-control-allow-origin", apiRequest.headers.get("Origin") ?? "*");
apiRequest._responseHeaders.set("vary", "origin");
}
let response;
try {
response = await this.routes.handle(apiRequest);
}
catch (e) {
if (e instanceof ThrowableResponse) {
response = e.getResponse();
const cause = e.getError();
if (cause !== null)
this.emit("error", cause);
}
else if (e instanceof RouteRegistry.NoRouteError)
response = this.errors._get(1 /* ServerErrorRegistry.ErrorCodes.NO_ROUTE */, apiRequest);
else {
this.emit("error", e);
response = this.errors._get(2 /* ServerErrorRegistry.ErrorCodes.INTERNAL */, apiRequest);
}
}
await this.sendResponse(response, res, apiRequest);
}
async sendResponse(response, res, req) {
conditional: if (this.handleConditionalRequests
&& response.statusCode === 200
&& ["GET" /* Request.Method.GET */, "HEAD" /* Request.Method.HEAD */].includes(req.method)) {
const responseHeaders = response.allHeaders(res, req);
const etag = responseHeaders.get("etag");
const lastModified = responseHeaders.has("last-modified")
? new Date(responseHeaders.get("last-modified"))
: null;
if (etag === null && lastModified === null)
break conditional;
if (req.headers.has("if-match")) {
if (!this.getETags(req.headers.get("if-match"))
.filter(t => !t.startsWith("W/"))
.includes(etag))
return this.errors._get(3 /* ServerErrorRegistry.ErrorCodes.PRECONDITION_FAILED */, req)._send(res, req);
}
else if (req.headers.has("if-unmodified-since")) {
if (lastModified === null
|| lastModified.getTime() > new Date(req.headers.get("if-unmodified-since")).getTime())
return this.errors._get(3 /* ServerErrorRegistry.ErrorCodes.PRECONDITION_FAILED */, req)._send(res, req);
}
if (req.headers.has("if-none-match")) {
if (this.getETags(req.headers.get("if-none-match"))
.includes(etag))
return new EmptyResponse(responseHeaders, 304)._send(res, req);
}
else if (req.headers.has("if-modified-since")) {
if (lastModified !== null
&& lastModified.getTime() <= new Date(req.headers.get("if-modified-since")).getTime())
return new EmptyResponse(responseHeaders, 304)._send(res, req);
}
}
await response._send(res, req);
}
getETags(header) {
return header
.split(",")
.map(t => t.trim());
}
}
export { Server };
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