From db1c3b5f19cf58029045f83a6a17b5e5ce98ea87 Mon Sep 17 00:00:00 2001 From: Keith Casko Date: Thu, 23 Jul 2026 00:54:01 -0400 Subject: [PATCH] Initial ByteGeist Toolbox uptime checker --- .dockerignore | 6 + .gitignore | 5 + Dockerfile | 20 + docker-compose.yml | 12 + package-lock.json | 1253 ++++++++++++++++++++++++++++ package.json | 18 + public/app.js | 76 ++ public/index.html | 93 +++ public/styles.css | 236 ++++++ src/middleware/rateLimit.js | 26 + src/routes/uptime.js | 30 + src/server.js | 38 + src/services/uptimeService.js | 101 +++ src/services/urlSecurityService.js | 119 +++ tests/urlSecurityService.test.js | 114 +++ 15 files changed, 2147 insertions(+) create mode 100644 .dockerignore create mode 100644 .gitignore create mode 100644 Dockerfile create mode 100644 docker-compose.yml create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 public/app.js create mode 100644 public/index.html create mode 100644 public/styles.css create mode 100644 src/middleware/rateLimit.js create mode 100644 src/routes/uptime.js create mode 100644 src/server.js create mode 100644 src/services/uptimeService.js create mode 100644 src/services/urlSecurityService.js create mode 100644 tests/urlSecurityService.test.js diff --git a/.dockerignore b/.dockerignore new file mode 100644 index 0000000..9ae0053 --- /dev/null +++ b/.dockerignore @@ -0,0 +1,6 @@ +node_modules +npm-debug.log +.git +.gitignore +tests +.env diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..39b36ce --- /dev/null +++ b/.gitignore @@ -0,0 +1,5 @@ +node_modules/ +.env +npm-debug.log* +.DS_Store +Thumbs.db diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..4dd25ad --- /dev/null +++ b/Dockerfile @@ -0,0 +1,20 @@ +# 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"] diff --git a/docker-compose.yml b/docker-compose.yml new file mode 100644 index 0000000..e7bfedc --- /dev/null +++ b/docker-compose.yml @@ -0,0 +1,12 @@ +services: + bytegeist-toolbox: + build: . + container_name: bytegeist-toolbox + restart: unless-stopped + + ports: + - "3001:3001" + + environment: + PORT: 3001 + NODE_ENV: production diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..7949073 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1253 @@ +{ + "name": "bytegeist-toolbox", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "bytegeist-toolbox", + "version": "1.0.0", + "license": "ISC", + "dependencies": { + "express": "^5.2.1", + "express-rate-limit": "^8.6.0", + 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+} diff --git a/package.json b/package.json new file mode 100644 index 0000000..aff3c2b --- /dev/null +++ b/package.json @@ -0,0 +1,18 @@ +{ + "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" + } +} diff --git a/public/app.js b/public/app.js new file mode 100644 index 0000000..965efa2 --- /dev/null +++ b/public/app.js @@ -0,0 +1,76 @@ +// 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"; + } +}); \ No newline at end of file diff --git a/public/index.html b/public/index.html new file mode 100644 index 0000000..2f195c1 --- /dev/null +++ b/public/index.html @@ -0,0 +1,93 @@ + + + + + + + + + ByteGeist Toolbox + + + + + +
+
+
+

BYTEGEIST TOOLBOX

+

Website Uptime Checker

+

+ Check whether a public website is reachable and see its status code, + response time, redirects, and final destination. +

+
+ +
+ + +
+ + + +
+
+ + +

+ + + +
+
+ + + + + \ No newline at end of file diff --git a/public/styles.css b/public/styles.css new file mode 100644 index 0000000..4f59596 --- /dev/null +++ b/public/styles.css @@ -0,0 +1,236 @@ +/* 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%; + } +} \ No newline at end of file diff --git a/src/middleware/rateLimit.js b/src/middleware/rateLimit.js new file mode 100644 index 0000000..115e9ed --- /dev/null +++ b/src/middleware/rateLimit.js @@ -0,0 +1,26 @@ +// 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, +}; \ No newline at end of file diff --git a/src/routes/uptime.js b/src/routes/uptime.js new file mode 100644 index 0000000..a245967 --- /dev/null +++ b/src/routes/uptime.js @@ -0,0 +1,30 @@ +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; \ No newline at end of file diff --git a/src/server.js b/src/server.js new file mode 100644 index 0000000..00bb9a2 --- /dev/null +++ b/src/server.js @@ -0,0 +1,38 @@ +// 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}`); +}); \ No newline at end of file diff --git a/src/services/uptimeService.js b/src/services/uptimeService.js new file mode 100644 index 0000000..5e3d110 --- /dev/null +++ b/src/services/uptimeService.js @@ -0,0 +1,101 @@ +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, +}; \ No newline at end of file diff --git a/src/services/urlSecurityService.js b/src/services/urlSecurityService.js new file mode 100644 index 0000000..b6e19e0 --- /dev/null +++ b/src/services/urlSecurityService.js @@ -0,0 +1,119 @@ +// 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, +}; \ No newline at end of file diff --git a/tests/urlSecurityService.test.js b/tests/urlSecurityService.test.js new file mode 100644 index 0000000..fc930d8 --- /dev/null +++ b/tests/urlSecurityService.test.js @@ -0,0 +1,114 @@ +// 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/ + ); +}); \ No newline at end of file