Tweaks to showing new version available

- Added frontend translation for english
- Moved frontend api logic to hook and backend api space
- Added swagger schema for the new api endpoint
- Moved backend logic to its own internal file
- Added user agent header to github api check
- Added cypress integration test for version check api
- Added a memory cache item from github check to avoid hitting it too
  much

backend/routes/version.js

@@ -1,8 +1,6 @@
 import express from "express";
+import internalRemoteVersion from "../internal/remote-version.js";
 import { debug, express as logger } from "../logger.js";
-import pjson from "../package.json" with { type: "json" };
-import https from "node:https";
-import { ProxyAgent } from "proxy-agent";
 
 const router = express.Router({
 	caseSensitive: true,
@@ -24,78 +22,19 @@ router
 	 *
 	 * Check for available updates
 	 */
-	.get(async (req, res, next) => {
+	.get(async (req, res, _next) => {
 		try {
-			const agent = new ProxyAgent();
-			const url = "https://api.github.com/repos/NginxProxyManager/nginx-proxy-manager/releases/latest";
-
-			const data = await new Promise((resolve, reject) => {
-				https
-					.get(url, { agent }, (response) => {
-						if (response.statusCode !== 200) {
-							reject(new Error(`GitHub API returned ${response.statusCode}`));
-							return;
-						}
-
-						response.setEncoding("utf8");
-						let raw_data = "";
-
-						response.on("data", (chunk) => {
-							raw_data += chunk;
-						});
-
-						response.on("end", () => {
-							try {
-								resolve(JSON.parse(raw_data));
-							} catch (err) {
-								reject(err);
-							}
-						});
-					})
-					.on("error", (err) => {
-						reject(err);
-					});
-			});
-
-			const latestVersion = data.tag_name;
-
-			const version = pjson.version.split("-").shift().split(".");
-			const currentVersion = `v${version[0]}.${version[1]}.${version[2]}`;
-
-			res.status(200).send({
-				current: currentVersion,
-				latest: latestVersion,
-				updateAvailable: compareVersions(currentVersion, latestVersion),
-			});
+			const data = await internalRemoteVersion.get();
+			res.status(200).send(data);
 		} catch (error) {
 			debug(logger, `${req.method.toUpperCase()} ${req.path}: ${error}`);
+			// Send 200 even though there's an error to avoid triggering update checks repeatedly
 			res.status(200).send({
 				current: null,
 				latest: null,
-				updateAvailable: false,
+				update_available: false,
 			});
 		}
 	});
 
-/**
- * Compare two version strings
- *
- */
-function compareVersions(current, latest) {
-	const cleanCurrent = current.replace(/^v/, "");
-	const cleanLatest = latest.replace(/^v/, "");
-
-	const currentParts = cleanCurrent.split(".").map(Number);
-	const latestParts = cleanLatest.split(".").map(Number);
-
-	for (let i = 0; i < Math.max(currentParts.length, latestParts.length); i++) {
-		const curr = currentParts[i] || 0;
-		const lat = latestParts[i] || 0;
-
-		if (lat > curr) return true;
-		if (lat < curr) return false;
-	}
-	return false;
-}
-
 export default router;