this works, to the extent that i tested it

.gitignore

@@ -1,3 +1,5 @@
 node_modules/
 .env
 package-lock.json
+actions.log
+logs/

index.js

@@ -0,0 +1,29 @@
+import express from 'express';
+import bodyParser from 'body-parser';
+import helmet from 'helmet';
+import cookieParser from 'cookie-parser';
+import dotenv from 'dotenv';
+import path from 'path';
+import { fileURLToPath } from 'url';
+dotenv.config();
+
+import webhookRouter from './routes/webhook.js';
+import execRouter from './routes/exec.js';
+
+import { info } from './util/Console.js';
+
+const app = express();
+app.use(helmet());
+app.use(bodyParser.json());
+app.use(cookieParser());
+app.use(express.static('public'));
+
+app.use('/webhook', webhookRouter);
+app.use('/exec', execRouter);
+
+const PORT = process.env.PORT || 3000;
+const HOST = process.env.BIND_ADDRESS || '0.0.0.0';
+
+app.listen(PORT, HOST, () => {
+    info(`API listening on ${HOST}:${PORT}`);
+});

package.json

@@ -1,20 +1,27 @@
 {
-  "name": "smithy-pelican-router-webhook-api",
-  "version": "0.0.1",
-  "description": "api to manage the router for pelican servers",
-  "license": "ISC",
-  "author": "may p",
-  "type": "commonjs",
-  "main": "index.js",
-  "scripts": {
-    "test": "."
-  },
-  "dependencies": {
-    "body-parser": "^2.2.0",
-    "crypto": "^1.0.1",
-    "dotenv": "^17.2.3",
-    "express": "^5.1.0",
-    "fs": "^0.0.1-security",
-    "ssh2": "^1.17.0"
-  }
+    "name": "smithy-pelican-router-webhook-api",
+    "version": "0.0.1",
+    "description": "api to manage the router for pelican servers",
+    "license": "ISC",
+    "author": "may p",
+    "type": "module",
+    "main": "index.js",
+    "repository": {
+        "type": "git",
+        "url": "git+https://git.bigsmithy.org/Smithy/smithy-pelican-router-webhook-api.git"
+    },
+    "scripts": {
+        "start": "node index.js",
+        "dev": "NODE_ENV=development node index.js"
+    },
+    "dependencies": {
+        "body-parser": "^1.20.2",
+        "colors": "^1.4.0",
+        "cookie-parser": "^1.4.6",
+        "dotenv": "^16.0.0",
+        "express": "^4.18.2",
+        "fs": "^0.0.1-security",
+        "helmet": "^7.0.0",
+        "ssh2": "^1.11.0"
+    }
 }

routes/exec.js

@@ -0,0 +1,63 @@
+import express from 'express';
+import { enqueueCmd } from '../services/natQueue.js';
+import { runRouterCmds } from '../services/sshExec.js';
+import { error, info } from '../util/Console.js';
+
+const router = express.Router();
+
+const SAFE_CMD_REGX = /^\s*(show|ping|traceroute|terminal length|show ip|show interfaces|show version|show running-config|show ip nat)\b/i;
+
+function checkAdminToken(req) {
+    const token = req.headers['x-admin-token'] || req.body.token || req.query.token;
+    const saved = req.app.get('adminToken');
+    const expiry = req.app.get('adminTokenExpory') || 0;
+    if (!token || !saved) return false;
+    if (Date.now() > expiry) return false;
+    return token === saved;
+}
+
+router.post('/', async (req, res) => {
+    const cmd = (req.body && req.body.cmd) || '';
+    if (!cmd) return res.status(400).json({ error: 'no command' });
+    const isAdmin = checkAdminToken(req);
+    if (!isAdmin && !SAFE_CMD_REGX.test(cmd)) return res.status(403).json({ error: 'not allowed' });
+
+    info(`Exec requested${isAdmin ? ' [admin]' : ''}: ${cmd}`);
+
+    try {
+        enqueueCmd(() => runRouterCmds([cmd]));
+        res.json({ success: true });
+    } catch (err) {
+        error(err);
+        res.status(500).json({ error: 'exec failed' });
+    }
+});
+
+router.get('/stream', (req, res) => {
+    const cmd = req.query.cmd || '';
+    if (!cmd) return res.status(400).send('no command');
+    const isAdmin = checkAdminToken(req);
+    if (!isAdmin && !SAFE_CMD_REGX.test(cmd)) return res.status(400).send('not allowed');
+
+    res.setHeader('Content-Type', 'text/event-stream');
+    res.setHeader('Cache-Control', 'no-cache');
+    res.setHeader('Connection', 'keep-alive');
+    res.flushHeaders && res.flushHeaders();
+
+    enqueueCmd(() => new Promise(async (resolve) => {
+        try {
+            await runRouterCmds([cmd], chunk => {
+                res.write(`data: ${chunk.replace(/\n/g, '\\n')}\n\n`);
+            });
+            res.write('data: [[EOF]]\n\n');
+            res.end();
+            resolve()
+        } catch (err) {
+            res.write(`data: [ERROR] ${String(err)}\n\n`);
+            res.end();
+            resolve();
+        }
+    }));
+});
+
+export default router;

routes/webhook.js

@@ -0,0 +1,32 @@
+import express from 'express';
+import { enqueueNatAdd, enqueueNatRemove } from '../services/natQueue.js';
+import { error, info, warn } from '../util/Console.js';
+
+const router = express.Router();
+
+router.post('/', (req, res) => {
+    const sig = req.headers['x-webhook-signature'] || req.headers['x-hook-signature'] || '';
+    const secret = process.env.WEBHOOK_SECRET || '';
+    if (!sig || sig !== secret) return res.status(403).json({ error: 'invalid signature' });
+
+    const body = req.body || {};
+    const event = body.event || '';
+    const data = body || {};
+    info(`Webhook: ${event}\n${JSON.stringify(body)}`);
+    // return res.status(418).json({ error: 'im a teapot' }); // temporary
+    try {
+        if (event === 'created: Allocation') {
+            enqueueNatAdd(data.ip, data.port, 'tcp');
+        } else if (event === 'deleted: Allocation') {
+            enqueueNatRemove(data.ip, data.port, 'tcp');
+        } else {
+            warn(`Unhandled webhook event: ${event}`);
+        }
+        return res.json({ success: true });
+    } catch (err) {
+        error(err);
+        return res.status(500).json({ error: 'error ocurred' });
+    }
+});
+
+export default router;

services/natQueue.js

@@ -0,0 +1,48 @@
+import { error, info, success } from "../util/Console.js";
+import { runRouterCmds } from "./sshExec.js";
+
+const queue = [];
+let running = false;
+
+function enqueue(task) {
+    queue.push(task);
+    if (!running) processQueue();
+}
+
+async function processQueue() {
+    if (queue.length === 0) { running = false; return; }
+    running = true;
+    const t = queue.shift();
+    try { await t(); } catch (err) { error('Queue error: ' + String(err)); }
+    setImmediate(processQueue);
+}
+
+export function enqueueCmd(fn) {
+    enqueue(() => fn());
+}
+
+export function enqueueNatAdd(ip, port, proto='tcp') {
+    enqueue(async () => {
+        info(`NAT ADD ${proto} ${ip}:${port}`);
+        await runRouterCmds([
+            'conf t',
+            `ip nat inside source static ${proto} ${ip} ${port} interface ${process.env.ROUTER_WAN_IF || 'gi0'} ${port}`,
+            'end',
+            'wr mem'
+        ]);
+        success(`NAT ADDED ${proto} ${ip}:${port}`);
+    });
+}
+
+export function enqueueNatRemove(ip, port, proto='tcp') {
+    enqueue(async () => {
+        info(`NAT DEL ${proto} ${ip}:${port}`);
+        await runRouterCmds([
+            'conf t',
+            `no ip nat inside source static ${proto} ${ip} ${port} interface ${process.env.ROUTER_WAN_IF || 'gi0'} ${port}`,
+            'end',
+            'wr mem'
+        ]);
+        success(`NAT DELETED ${proto} ${ip}:${port}`);
+    });
+}

services/sshExec.js

@@ -0,0 +1,58 @@
+import { Client } from "ssh2";
+import { info } from "../util/Console.js";
+import fs from 'fs';
+
+
+export function runRouterCmds(cmds, onData) {
+    const ROUTER = {
+        host: process.env.ROUTER_HOST || '192.168.0.1',
+        username: process.env.ROUTER_USER || 'cisco',
+        password: process.env.ROUTER_PASS || '',
+        wanInterface: process.env.ROUTER_WAN_IF || 'gi0'
+    };
+
+    return new Promise((resolve, reject) => {
+        const conn = new Client();
+        let out = '';
+        conn.on('ready', () => {
+            conn.shell((err, stream) => {
+                if (err) return reject(err);
+                stream.on('data', d => {
+                    const s = d.toString();
+                    out += s;
+                    if (onData) onData(s);
+                });
+                stream.on('close', () => {
+                    conn.end();
+                    resolve(out);
+                });
+                cmds.forEach(c => stream.write(c + '\n'));
+                stream.end('exit\n');
+            });
+        }).on('error', reject).connect({
+            host: ROUTER.host,
+            username: ROUTER.username,
+            password: ROUTER.password,
+            readyTimeout: 20000,
+            algorithms: {
+                kex: [
+                    'diffie-hellman-group14-sha1',
+                    'diffie-hellman-group-exchange-sha1',
+                ],
+                cipher: [
+                    'aes128-ctr',
+                    'aes192-ctr',
+                    'aes256-ctr',
+                ],
+                serverHostKey: [
+                    'ssh-rsa',
+                ],
+                hmac: [
+                    'hmac-sha1',
+                    'hmac-sha2-256',
+                ]
+            },
+            hostVerifier: () => true
+        });
+    });
+}

util/Console.js

@@ -0,0 +1,54 @@
+import 'colors';
+import fs from 'fs';
+
+/**
+ * @param {string[]} message
+ */
+export const info = (...message) => {
+    const time = new Date().toLocaleTimeString();
+    let fileContent = fs.readFileSync('./logs/terminal.log', 'utf-8');
+
+    console.info(`[${time}]`.gray, '[Info]'.blue, message.join(' '));
+    fileContent += [`[${time}]`.gray, '[Info]'.blue, message.join(' ')].join(' ') + '\n';
+
+    fs.writeFileSync('./logs/terminal.log', fileContent, 'utf-8');
+}
+
+/**
+ * @param {string[]} message
+ */
+export const success = (...message) => {
+    const time = new Date().toLocaleTimeString();
+    let fileContent = fs.readFileSync('./logs/terminal.log', 'utf-8');
+
+    console.info(`[${time}]`.gray, '[OK]'.green, message.join(' '));
+    fileContent += [`[${time}]`.gray, '[OK]'.green, message.join(' ')].join(' ') + '\n';
+
+    fs.writeFileSync('./logs/terminal.log', fileContent, 'utf-8');
+}
+
+/**
+ * 
+ */
+export const error = (...message) => {
+    const time = new Date().toLocaleTimeString();
+    let fileContent = fs.readFileSync('./logs/terminal.log', 'utf-8');
+
+    console.error(`[${time}]`.gray, '[Error]'.red, message.join(' '));
+    fileContent += [`[${time}]`.gray, '[Error]'.red, message.join(' ')].join(' ') + '\n'
+
+    fs.writeFileSync('./logs/terminal.log', fileContent, 'utf-8')
+}
+
+/**
+ * @param {string[]} message
+ */
+export const warn = (...message) => {
+    const time = new Date().toLocaleTimeString();
+    let fileContent = fs.readFileSync('./logs/terminal.log', 'utf-8');
+
+    console.info(`[${time}]`.gray, '[Warn]'.yellow, message.join(' '));
+    fileContent += [`[${time}]`.gray, '[Warn]'.yellow, message.join(' ')].join(' ') + '\n';
+
+    fs.writeFileSync('./logs/terminal.log', fileContent, 'utf-8');
+}