Initial ByteGeist Toolbox uptime checker

This commit is contained in:
Keith Casko
2026-07-23 00:54:01 -04:00
commit db1c3b5f19
15 changed files with 2147 additions and 0 deletions
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node_modules
npm-debug.log
.git
.gitignore
tests
.env
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node_modules/
.env
npm-debug.log*
.DS_Store
Thumbs.db
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# Use a small official Node.js image.
FROM node:22-alpine
# Set the working directory inside the container.
WORKDIR /app
# Copy package files first so Docker can cache dependency installs.
COPY package*.json ./
# Install production dependencies only.
RUN npm ci --omit=dev
# Copy the rest of the project files.
COPY . .
# Document the port used by the application.
EXPOSE 3001
# Start the Node.js server.
CMD ["npm", "start"]
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services:
bytegeist-toolbox:
build: .
container_name: bytegeist-toolbox
restart: unless-stopped
ports:
- "3001:3001"
environment:
PORT: 3001
NODE_ENV: production
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{
"name": "bytegeist-toolbox",
"version": "1.0.0",
"license": "ISC",
"scripts": {
"start": "node src/server.js",
"dev": "nodemon src/server.js",
"test": "node --test"
},
"dependencies": {
"express": "^5.2.1",
"express-rate-limit": "^8.6.0",
"ipaddr.js": "^2.4.0"
},
"devDependencies": {
"nodemon": "^3.1.14"
}
}
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// Get references to the page elements we need to update.
const form = document.getElementById("uptime-form");
const urlInput = document.getElementById("url-input");
const checkButton = document.getElementById("check-button");
const statusMessage = document.getElementById("status-message");
const resultPanel = document.getElementById("result-panel");
const onlineBadge = document.getElementById("online-badge");
const statusCode = document.getElementById("status-code");
const responseTime = document.getElementById("response-time");
const redirectCount = document.getElementById("redirect-count");
const checkedAt = document.getElementById("checked-at");
const finalUrl = document.getElementById("final-url");
// Listen for the form submission.
form.addEventListener("submit", async (event) => {
// Prevent the browser from reloading the page.
event.preventDefault();
const url = urlInput.value.trim();
// Reset the interface before starting a new check.
statusMessage.textContent = "Checking website...";
statusMessage.className = "status-message";
resultPanel.hidden = true;
checkButton.disabled = true;
checkButton.textContent = "Checking...";
try {
const response = await fetch("/api/uptime", {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify({ url }),
});
const result = await response.json();
// Handle API-level errors.
if (!response.ok) {
throw new Error(result.error || "The request failed.");
}
// Handle unreachable or blocked destinations.
if (!result.online) {
throw new Error(result.error || "The website could not be reached.");
}
// Fill in the successful result.
onlineBadge.textContent = "Online";
onlineBadge.className = "status-badge online";
statusCode.textContent = result.statusCode;
responseTime.textContent = `${result.responseTimeMs} ms`;
redirectCount.textContent = result.redirectCount;
checkedAt.textContent = new Date(result.checkedAt).toLocaleString();
finalUrl.textContent = result.finalUrl;
finalUrl.href = result.finalUrl;
statusMessage.textContent = "Website check completed.";
resultPanel.hidden = false;
} catch (error) {
// Show a safe, readable message to the user.
statusMessage.textContent = error.message;
statusMessage.className = "status-message error";
onlineBadge.textContent = "Offline";
onlineBadge.className = "status-badge offline";
} finally {
// Restore the button whether the request succeeded or failed.
checkButton.disabled = false;
checkButton.textContent = "Check Website";
}
});
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<!-- Makes the page scale correctly on phones and tablets. -->
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>ByteGeist Toolbox</title>
<!-- Load the stylesheet from the public folder. -->
<link rel="stylesheet" href="styles.css">
</head>
<body>
<main class="page-shell">
<section class="tool-panel">
<header class="tool-header">
<p class="eyebrow">BYTEGEIST TOOLBOX</p>
<h1>Website Uptime Checker</h1>
<p class="description">
Check whether a public website is reachable and see its status code,
response time, redirects, and final destination.
</p>
</header>
<form id="uptime-form" class="uptime-form">
<label for="url-input">Website URL</label>
<div class="input-row">
<input
id="url-input"
name="url"
type="url"
placeholder="https://example.com"
autocomplete="url"
required
>
<button id="check-button" type="submit">
Check Website
</button>
</div>
</form>
<!-- JavaScript updates this message during loading and errors. -->
<p id="status-message" class="status-message" aria-live="polite"></p>
<!-- Hidden until a result is returned. -->
<section id="result-panel" class="result-panel" hidden>
<div class="result-heading">
<h2>Check Result</h2>
<span id="online-badge" class="status-badge"></span>
</div>
<dl class="result-grid">
<div>
<dt>Status code</dt>
<dd id="status-code">-</dd>
</div>
<div>
<dt>Response time</dt>
<dd id="response-time">-</dd>
</div>
<div>
<dt>Redirects</dt>
<dd id="redirect-count">-</dd>
</div>
<div>
<dt>Checked at</dt>
<dd id="checked-at">-</dd>
</div>
</dl>
<div class="final-url-block">
<span>Final URL</span>
<a
id="final-url"
href="#"
target="_blank"
rel="noopener noreferrer"
></a>
</div>
</section>
</section>
</main>
<!-- Load the browser JavaScript after the HTML is available. -->
<script src="app.js"></script>
</body>
</html>
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/* Use predictable sizing for every element. */
* {
box-sizing: border-box;
}
:root {
color-scheme: dark;
--background: #080c14;
--surface: #111827;
--surface-light: #182235;
--border: #2b3952;
--text: #edf4ff;
--muted: #9eabc0;
--accent: #4ca6ff;
--accent-hover: #78bcff;
--success: #49d17d;
--danger: #ff6b73;
}
body {
margin: 0;
min-height: 100vh;
background:
radial-gradient(circle at top, #17253b 0%, var(--background) 42%);
color: var(--text);
font-family:
Inter,
ui-sans-serif,
system-ui,
-apple-system,
BlinkMacSystemFont,
"Segoe UI",
sans-serif;
}
button,
input {
font: inherit;
}
.page-shell {
display: grid;
place-items: center;
min-height: 100vh;
padding: 32px 20px;
}
.tool-panel {
width: min(760px, 100%);
padding: 32px;
border: 1px solid var(--border);
border-radius: 14px;
background: rgba(17, 24, 39, 0.96);
box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}
.eyebrow {
margin: 0 0 8px;
color: var(--accent);
font-size: 0.78rem;
font-weight: 700;
letter-spacing: 0.16em;
}
h1,
h2,
p {
margin-top: 0;
}
h1 {
margin-bottom: 12px;
font-size: clamp(2rem, 5vw, 3.25rem);
line-height: 1.05;
}
.description {
max-width: 62ch;
margin-bottom: 28px;
color: var(--muted);
line-height: 1.6;
}
.uptime-form label {
display: block;
margin-bottom: 8px;
font-weight: 650;
}
.input-row {
display: grid;
grid-template-columns: 1fr auto;
gap: 12px;
}
input {
min-width: 0;
padding: 13px 14px;
border: 1px solid var(--border);
border-radius: 8px;
background: #0b1220;
color: var(--text);
outline: none;
}
input:focus {
border-color: var(--accent);
box-shadow: 0 0 0 3px rgba(76, 166, 255, 0.16);
}
button {
padding: 13px 18px;
border: 0;
border-radius: 8px;
background: var(--accent);
color: #04101c;
font-weight: 750;
cursor: pointer;
}
button:hover {
background: var(--accent-hover);
}
button:disabled {
cursor: wait;
opacity: 0.65;
}
.status-message {
min-height: 24px;
margin: 18px 0 0;
color: var(--muted);
}
.status-message.error {
color: var(--danger);
}
.result-panel {
margin-top: 24px;
padding: 22px;
border: 1px solid var(--border);
border-radius: 10px;
background: var(--surface-light);
}
.result-heading {
display: flex;
align-items: center;
justify-content: space-between;
gap: 16px;
margin-bottom: 18px;
}
.result-heading h2 {
margin-bottom: 0;
font-size: 1.25rem;
}
.status-badge {
padding: 5px 10px;
border-radius: 999px;
font-size: 0.82rem;
font-weight: 750;
}
.status-badge.online {
background: rgba(73, 209, 125, 0.14);
color: var(--success);
}
.status-badge.offline {
background: rgba(255, 107, 115, 0.14);
color: var(--danger);
}
.result-grid {
display: grid;
grid-template-columns: repeat(2, minmax(0, 1fr));
gap: 14px;
margin: 0;
}
.result-grid div {
padding: 14px;
border: 1px solid var(--border);
border-radius: 8px;
background: #0d1523;
}
.result-grid dt,
.final-url-block span {
margin-bottom: 6px;
color: var(--muted);
font-size: 0.82rem;
}
.result-grid dd {
margin: 0;
font-weight: 700;
}
.final-url-block {
display: grid;
gap: 5px;
margin-top: 14px;
padding: 14px;
border: 1px solid var(--border);
border-radius: 8px;
background: #0d1523;
}
.final-url-block a {
color: var(--accent);
overflow-wrap: anywhere;
}
@media (max-width: 640px) {
.tool-panel {
padding: 24px 18px;
}
.input-row {
grid-template-columns: 1fr;
}
.result-grid {
grid-template-columns: 1fr;
}
button {
width: 100%;
}
}
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// Import the rate-limiting middleware.
const rateLimit = require("express-rate-limit");
// Limit how often one IP address can use the uptime checker.
const uptimeRateLimiter = rateLimit({
// Count requests inside a 15-minute window.
windowMs: 15 * 60 * 1000,
// Allow 30 checks per IP during that window.
limit: 30,
// Return modern rate-limit headers.
standardHeaders: true,
// Disable older legacy headers.
legacyHeaders: false,
// Return a clear JSON message when the limit is reached.
message: {
error: "Too many website checks. Please try again later.",
},
});
module.exports = {
uptimeRateLimiter,
};
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const express = require("express");
const { checkWebsite } = require("../services/uptimeService");
const { uptimeRateLimiter } = require("../middleware/rateLimit");
const router = express.Router();
// POST /api/uptime
router.post("/", uptimeRateLimiter, async (req, res) => {
const { url } = req.body;
// Confirm that a URL was submitted as text.
if (typeof url !== "string" || url.trim() === "") {
return res.status(400).json({
error: "A URL is required.",
});
}
// Prevent excessively long input.
if (url.length > 2048) {
return res.status(400).json({
error: "The URL is too long.",
});
}
const result = await checkWebsite(url.trim());
return res.json(result);
});
module.exports = router;
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// Import Express so we can create the web server.
const express = require("express");
// Import path so we can safely point Express to the public folder.
const path = require("path");
// Import the uptime API route.
const uptimeRouter = require("./routes/uptime");
// Create the Express application.
const app = express();
// Use the PORT environment variable if one exists.
// Otherwise, use port 3001 for local development.
const PORT = process.env.PORT || 3001;
// Allow the server to read JSON request bodies.
app.use(express.json());
// Serve the files inside the public folder.
app.use(express.static(path.join(__dirname, "..", "public")));
// Handle website uptime checks.
app.use("/api/uptime", uptimeRouter);
// Simple health-check route.
app.get("/health", (req, res) => {
res.json({
status: "ok",
service: "bytegeist-toolbox",
timestamp: new Date().toISOString(),
});
});
// Start the web server.
app.listen(PORT, () => {
console.log(`ByteGeist Toolbox running at http://localhost:${PORT}`);
});
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const { validatePublicUrl } = require("./urlSecurityService");
// Maximum number of redirects the checker will follow.
const MAX_REDIRECTS = 5;
// Maximum time allowed for each request.
const REQUEST_TIMEOUT_MS = 5000;
// Check whether an HTTP status code represents a redirect.
function isRedirectStatus(statusCode) {
return [301, 302, 303, 307, 308].includes(statusCode);
}
// Check a public website and safely follow redirects.
async function checkWebsite(submittedUrl) {
const startTime = Date.now();
let currentUrl = submittedUrl;
let redirectCount = 0;
try {
while (redirectCount <= MAX_REDIRECTS) {
// Validate the current URL before every request.
// This prevents redirects from reaching private systems.
const validatedUrl = await validatePublicUrl(currentUrl);
const response = await fetch(validatedUrl, {
method: "GET",
// We handle redirects ourselves so every destination can be checked.
redirect: "manual",
// Stop waiting after five seconds.
signal: AbortSignal.timeout(REQUEST_TIMEOUT_MS),
headers: {
// Identify the service instead of pretending to be a browser.
"User-Agent": "ByteGeist-Toolbox/1.0",
},
});
// Check whether the response wants to redirect somewhere else.
if (isRedirectStatus(response.status)) {
const location = response.headers.get("location");
if (!location) {
throw new Error("The website returned an invalid redirect.");
}
redirectCount += 1;
if (redirectCount > MAX_REDIRECTS) {
throw new Error("The website redirected too many times.");
}
// Convert relative redirects such as /login into complete URLs.
currentUrl = new URL(location, validatedUrl).toString();
// Continue the loop and validate the redirect destination.
continue;
}
const responseTimeMs = Date.now() - startTime;
// Cancel the response body because we only need status information.
// This avoids downloading an entire website.
if (response.body) {
await response.body.cancel();
}
return {
online: true,
statusCode: response.status,
responseTimeMs,
finalUrl: validatedUrl.toString(),
redirectCount,
checkedAt: new Date().toISOString(),
};
}
throw new Error("The website redirected too many times.");
} catch (error) {
if (error.name === "TimeoutError") {
return {
online: false,
error: "The website took too long to respond.",
checkedAt: new Date().toISOString(),
};
}
return {
online: false,
error: error.message || "The website could not be reached.",
checkedAt: new Date().toISOString(),
};
}
}
module.exports = {
checkWebsite,
};
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// Import DNS tools so we can resolve domain names before requesting them.
const dns = require("dns").promises;
// Import Node's IP address checker.
const net = require("net");
// Import ipaddr.js so we can classify IPv4 and IPv6 addresses.
const ipaddr = require("ipaddr.js");
// Check whether an IP address belongs to a blocked private or local range.
function isPrivateIp(ipAddress) {
try {
const address = ipaddr.parse(ipAddress);
// ipaddr.js labels addresses with ranges such as:
// private, loopback, linkLocal, multicast, and unspecified.
const blockedRanges = [
"private",
"loopback",
"linkLocal",
"uniqueLocal",
"multicast",
"unspecified",
"reserved",
"broadcast",
"carrierGradeNat",
];
return blockedRanges.includes(address.range());
} catch {
// An address that cannot be parsed should not be trusted.
return true;
}
}
// Validate a URL before the server makes a request.
async function validatePublicUrl(urlValue) {
let parsedUrl;
try {
// Convert the submitted text into a proper URL object.
parsedUrl = new URL(urlValue);
} catch {
throw new Error("Enter a valid URL.");
}
// Only allow normal website protocols.
if (parsedUrl.protocol !== "http:" && parsedUrl.protocol !== "https:") {
throw new Error("Only HTTP and HTTPS URLs are allowed.");
}
// Do not allow usernames or passwords inside the URL.
if (parsedUrl.username || parsedUrl.password) {
throw new Error("URLs containing usernames or passwords are not allowed.");
}
// Initially allow only normal HTTP and HTTPS ports.
const allowedPorts = ["", "80", "443"];
if (!allowedPorts.includes(parsedUrl.port)) {
throw new Error("Only ports 80 and 443 are allowed.");
}
const hostname = parsedUrl.hostname.toLowerCase();
// Block common local hostnames.
const blockedHostnames = [
"localhost",
"localhost.localdomain",
"host.docker.internal",
];
if (
blockedHostnames.includes(hostname) ||
hostname.endsWith(".localhost") ||
hostname.endsWith(".local")
) {
throw new Error("Local and private network addresses are not allowed.");
}
// If the hostname is already an IP address, inspect it directly.
if (net.isIP(hostname)) {
if (isPrivateIp(hostname)) {
throw new Error("Local and private network addresses are not allowed.");
}
return parsedUrl;
}
let resolvedAddresses;
try {
// Resolve every IP address associated with the hostname.
resolvedAddresses = await dns.lookup(hostname, {
all: true,
verbatim: true,
});
} catch {
throw new Error("The hostname could not be resolved.");
}
if (resolvedAddresses.length === 0) {
throw new Error("The hostname did not resolve to an IP address.");
}
// Reject the hostname if any resolved address is private or local.
for (const result of resolvedAddresses) {
if (isPrivateIp(result.address)) {
throw new Error("Local and private network addresses are not allowed.");
}
}
return parsedUrl;
}
module.exports = {
validatePublicUrl,
isPrivateIp,
};
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// Import Node's built-in test tools.
const test = require("node:test");
const assert = require("node:assert/strict");
// Import the functions we want to test.
const {
isPrivateIp,
validatePublicUrl,
} = require("../src/services/urlSecurityService");
// ---------------------------------------------------------
// isPrivateIp() tests
// ---------------------------------------------------------
test("blocks IPv4 loopback addresses", () => {
assert.equal(isPrivateIp("127.0.0.1"), true);
});
test("blocks private 10.x.x.x addresses", () => {
assert.equal(isPrivateIp("10.0.0.1"), true);
});
test("blocks private 172.16.x.x addresses", () => {
assert.equal(isPrivateIp("172.16.0.1"), true);
});
test("blocks private 192.168.x.x addresses", () => {
assert.equal(isPrivateIp("192.168.1.1"), true);
});
test("blocks link-local addresses", () => {
assert.equal(isPrivateIp("169.254.1.1"), true);
});
test("blocks IPv6 loopback", () => {
assert.equal(isPrivateIp("::1"), true);
});
test("allows a public IPv4 address", () => {
assert.equal(isPrivateIp("1.1.1.1"), false);
});
test("blocks malformed IP addresses", () => {
assert.equal(isPrivateIp("not-an-ip"), true);
});
// ---------------------------------------------------------
// validatePublicUrl() tests
// ---------------------------------------------------------
test("accepts a public HTTP URL using a public IP", async () => {
const result = await validatePublicUrl("http://1.1.1.1");
assert.equal(result.protocol, "http:");
assert.equal(result.hostname, "1.1.1.1");
});
test("accepts a public HTTPS URL using a public IP", async () => {
const result = await validatePublicUrl("https://1.1.1.1");
assert.equal(result.protocol, "https:");
assert.equal(result.hostname, "1.1.1.1");
});
test("rejects localhost", async () => {
await assert.rejects(
validatePublicUrl("http://localhost"),
/Local and private network addresses are not allowed/
);
});
test("rejects localhost subdomains", async () => {
await assert.rejects(
validatePublicUrl("http://test.localhost"),
/Local and private network addresses are not allowed/
);
});
test("rejects private IP addresses", async () => {
await assert.rejects(
validatePublicUrl("http://192.168.1.1"),
/Local and private network addresses are not allowed/
);
});
test("rejects unsupported protocols", async () => {
await assert.rejects(
validatePublicUrl("ftp://example.com"),
/Only HTTP and HTTPS URLs are allowed/
);
});
test("rejects URLs containing credentials", async () => {
await assert.rejects(
validatePublicUrl("https://username:password@example.com"),
/URLs containing usernames or passwords are not allowed/
);
});
test("rejects nonstandard ports", async () => {
await assert.rejects(
validatePublicUrl("https://example.com:8080"),
/Only ports 80 and 443 are allowed/
);
});
test("rejects malformed URLs", async () => {
await assert.rejects(
validatePublicUrl("this is not a URL"),
/Enter a valid URL/
);
});