Initial Commit

Reverse Proxy Rewrite
This commit is contained in:
2025-10-24 12:41:22 -07:00
commit 8ce8c25442
6 changed files with 914 additions and 0 deletions

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19
package.json Normal file
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{
"name": "node-reverse-proxy",
"version": "1.0.0",
"description": "Opens a HTTP and HTTPS port and forwards requests to proper host, supports WS",
"main": "ReverseProxy.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "node ./src/Program.js"
},
"author": "Kaveman",
"license": "ISC",
"dependencies": {
"better-sqlite3": "^12.4.1",
"bindings": "^1.5.0",
"fs": "^0.0.1-security",
"http-proxy": "^1.18.1",
"https": "^1.0.0"
}
}

23
src/Program.js Normal file
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'use strict';
const ReverseProxy = require("./ReverseProxy");
/*/ Test GetPath
[
"https://localhost/health",
"http://12/health",
"localhost/health",
"ws://websocket/path?key=value",
"ssh://hello:22/"
].forEach(url => {
console.log(`'${url}' => '${ReverseProxy.GetPath(url)}'`)
})//*/
ReverseProxy.Start()
/*/ Test host resolution
.then(instance => {
["kavemans.dev", "localhost"].forEach(host => {
console.log(`'${host}' => '${instance.TryResolveInternalHost(host)}'`);
});
});//*/

211
src/ReverseProxy.js Normal file
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'use strict';
const CreateHttpListener = require("http").createServer;
const CreateHttpsListener = require("https").createServer;
const CreateProxyService = require("http-proxy").createProxyServer;
const { readFileSync, existsSync } = require("fs");
const { once } = require("node:events");
const SQLiteConnection = require("better-sqlite3");
const IsNullOrUndefined = obj => (obj == null && typeof obj == "undefined");
const DefaultEnvPath = "./.env";
class CertificatePairMissingException extends Error {}
class ReverseProxy {
static Start = (envPath = DefaultEnvPath) => new ReverseProxy().#ctor(envPath);
async #ctor(envPath = DefaultEnvPath) {
// Open db
this.Data = new SQLiteConnection(`${envPath}/Hosts.sqlite3`, { readonly: true });
let routeCount = this.Data.prepare("SELECT COUNT(*) AS n FROM Hosts").pluck().get();
console.log(`Database opened with '${routeCount}' routes`);
// Bind to ports
const bindedProcessReq = this.#ProcessRequest.bind(this);
const httpPort = 80, httpsPort = 443;
try {
this.HttpEndpoint = await this.#CreateHttpEndpoint(httpPort);
this.HttpsEndpoint = await this.#CreateHttpsEndpoint(envPath, httpsPort);
} catch (e) {
console.error("Halting execution due to endpoint creation failure", e);
this.HttpEndpoint?.close();
this.HttpsEndpoint?.close();
return;
}
// Next up, create proxy service to reverse proxy
this.ProxyService = CreateProxyService();
// Subscribe to events
this.HttpEndpoint.on("upgrade", this.#HandleWebSocketUpgrade.bind(this));
this.HttpsEndpoint.on("upgrade", this.#HandleWebSocketUpgrade.bind(this));
// This is for logging proxy results
this.ProxyService.on("proxyRes", (proxyResponse, request, response) => {
// Check if there is an auth/access error
let internalStatus = response.statusCode;
if (response.statusCode == 511) {
if (IsNullOrUndefined(request.bailHandler)) {
response.writeHead(404, { "Content-Type": "text/plain" });
response.end(`You do not have the permissions to access '${host}', it's endpoint does not exist or the origin may be down`);
console.log(`[${internalStatus} as 404] ${request.method} ${hostname ?? request.headers?.host}${request.url}`);
proxyResponse.destroy();
return;
}
return request.bailHandler(internalStatus);
}
// Else let the response go through
console.log(`[${proxyResponse.statusCode}] ${request.method} '${request.headers?.host ?? ''}${request.url}'`);
});
// Start listening
// except we already started listening when initializing the http/s endpoints
return this;
}
async #CreateHttpEndpoint(port = 80, { cancellationToken } = {}) {
let endpoint = CreateHttpListener(this.#ProcessRequest.bind(this));
const raceConditions = [
once(endpoint, "listening"),
once(endpoint, "error").then(([err]) => Promise.reject(err)),
cancellationToken
];
endpoint.listen(port);
try {
await Promise.race(raceConditions
// Make sure to filter conditions to make sure they implement ".then"
.filter(x => x != null && typeof x.then === "function"));
} catch (err) {
try { endpoint.close(); } catch { /* ignore */ }
throw err;
}
console.log(`HTTP endpoint listening on port '${port}'`);
return endpoint;
}
async #CreateHttpsEndpoint(envPath = DefaultEnvPath, port = 443, { cancellationToken } = {}) {
const keyPath = `${envPath}/private.key`,
certPath = `${envPath}/public.crt`;
if (!existsSync(keyPath))
throw new CertificatePairMissingException(`Missing private key file at '${keyPath}'`);
if (!existsSync(certPath))
throw new CertificatePairMissingException(`Missing certificate file at '${certPath}'`);
let endpoint = CreateHttpsListener({
key: readFileSync(keyPath),
cert: readFileSync(certPath)
}, this.#ProcessRequest.bind(this));
// Subscribing to these events once before calling .listen
// to make sure they get called, even though they should be
// technically called in the next tick
const raceConditions = [
once(endpoint, "listening"),
once(endpoint, "error").then(([err]) => Promise.reject(err)),
cancellationToken
];
endpoint.listen(port);
try {
await Promise.race(raceConditions
// Make sure to filter conditions to make sure they implement ".then"
.filter(x => x != null && typeof x.then === "function"));
} catch (err) {
try { endpoint.close(); } catch { /* ignore */ }
throw err;
}
console.log(`HTTPS endpoint listening on port '${port}'`);
return endpoint;
}
static IsInternalAddress(addr = "") {
addr = addr.toLowerCase();
if (addr === "127.0.0.1" || addr === "::1") return true;
if (addr.startsWith("::ffff:")) {
const v4 = addr.slice(7); // e.g. "::ffff:127.0.0.1" -> "127.0.0.1"
return v4.startsWith("127.")
|| v4.startsWith("172."); // Docker
}
return false;
}
static GetPath(urlStr = "") {
// Pattern
// http[s]://[hostname]/1/2/3[?test]
// Remove '://'
urlStr = urlStr.trim();
//urlStr = urlStr.substring(urlStr.indexOf("://") + 3);
let protocolSeperatorIndex = urlStr.indexOf("://");
protocolSeperatorIndex = protocolSeperatorIndex == -1 ? 0 :protocolSeperatorIndex + 3;
let pathStartIndex = Math.max(urlStr.indexOf('/', protocolSeperatorIndex), 0),
queryStartIndex = urlStr.indexOf('?');
if (queryStartIndex < 0) queryStartIndex = urlStr.length;
return urlStr.substring(pathStartIndex, queryStartIndex);
}
#ProcessRequest(request, response) {
if (ReverseProxy.IsInternalAddress(request.socket.remoteAddress)) {
switch (ReverseProxy.GetPath(request.url)) {
case "/ready":
response.writeHead(200, { "Content-Type": "text/plain" });
response.end("200 Good to go!");
return;
case "/health":
response.writeHead(200, { "Content-Type": "text/plain" });
response.end("200 I'm still alive!");
return;
}
}
// Regular
const { host } = request.headers;
const resolvedHost = this.TryResolveInternalHost(host);
const { hostname } = new URL(resolvedHost);
const _bail = (internalStatus = 404) => {
response.writeHead(404, { "Content-Type": "text/plain" });
response.end(`You do not have the permissions to access '${host}', it's endpoint does not exist or the origin may be down`);
console.log(`[${internalStatus} as 404] ${request.method} ${hostname ?? request.headers?.host}${request.url}`);
};
if (IsNullOrUndefined(resolvedHost))
return _bail(404);
try {
request.headers.host = hostname;
this.ProxyService.web(request, response, { target: resolvedHost, xfwd: true }, proxyException => {
return _bail(502); // Bad Gateway: Error related to proxying
});
} catch (proxyError) { return _bail(500); }
}
#HandleWebSocketUpgrade(request, socket, head) {
const { host } = request.headers;
const resolvedHost = this.TryResolveInternalHost(host);
const { hostname } = new URL(resolvedHost);
const _bail = (internalStatus = 404) => {
console.log(`[${internalStatus} as 404] ${request.method}=>WS ${req.headers?.host ?? ''}${req.url}`);
socket.write(`HTTP/1.1 404 Not Found\r\nYou do not have the permissions to access '${host}', it's endpoint does not exist or the origin may be down\r\n`);
socket.destroy();
};
if (IsNullOrUndefined(resolvedHost))
return _bail(404);
try {
request.headers.host = hostname;
this.ProxyService.ws(Request, socket, head, { target: resolvedHost, xfwd: true }, proxyException => {
return _bail(502);
});
} catch (proxyError) { return _bail(500); }
}
TryResolveInternalHost(publicHost = "") {
const command = this.Data.prepare(`SELECT Target FROM Hosts
WHERE Domain = ? OR Domain = '*'
ORDER BY CASE WHEN Domain = '*' THEN 1 ELSE 0 END
LIMIT 1
;`).pluck();
let reader = command.get(publicHost);
return reader;
}
}
module.exports = ReverseProxy;