Version 1.0 del totem en el sistema bascula autonoma

uibuilder/.config/sioMiddleware.js-template

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+/**
+ * Template Socket.IO Connection Middleware for uibuilder.
+ * UPDATED: 2022-04-01
+ *
+ * NOTES & WARNINGS:
+ *   1) This function is only called ONCE - when a new client connects. So any authentication/security processing is limited
+ *      because you cannot use this to, for example, timeout/extend a session without further server processing of incoming messages.
+ *      However, see the sioUse.js and sioMsgOut.js middlewares for per-msg handling.
+ *   2) Failing to either return or call `next()` will mean that your clients will never connect.
+ *   3) An error in this function will probably cause Node-RED to fail to start at all.
+ *   4) You have to restart Node-RED if you change this file.
+ *   5) To use for authentication/authorisation with Express and sio connection middleware, create a common node.js module.
+ *
+ * Allows custom processing for authentication, session management, connection validation, logging, rate limiting, etc.
+ * 
+ * see also: uibRoot/.config/sioUse.js & sioMsgOut.js
+ *           https://cheatsheetseries.owasp.org/cheatsheets/HTML5_Security_Cheat_Sheet.html#websocket-implementation-hints
+ * 
+ * @param {*} socket Socket.IO socket object
+ * @param {function} next The callback to hand off to the next middleware
+ */
+function sioMw(socket, next) {
+    // Some SIO related info that might be useful in security checks
+    console.log('== [sioMiddleware.js] ====================')
+    console.log('New client connected to Namespace')
+    console.log('--socket.request.connection.remoteAddress--', socket.request.connection.remoteAddress)
+    console.log('--socket id--', socket.id)
+    // Added by uibuilder when Namespace is created by uibuilder node instance - Note also that socket.nsp.log can be used to output to the Node-RED log
+    console.log('--socket namespace metadata (server)--', {
+        name: socket.nsp.name,
+        url: socket.nsp.url,
+        nodeId: socket.nsp.nodeId,
+        useSecurity: socket.nsp.useSecurity,
+    })
+    //console.log('--socket handshake--', socket.handshake)
+    //console.log('--socket properties--', Object.keys(socket))
+    // Show the client id (set by uibuilder ExpressJS middleware)
+    console.log('--client id handshake.auth--', socket.handshake.auth.clientId)
+    console.log('--client id in custom header (polling only)--', socket.handshake.headers['x-clientid'])
+    console.log('==========================================\n ')
+
+    // Simplistic auth example
+    let auth = true
+    if (auth !== true) {
+        socket.nsp.log.error(`[uibuilder:sioMiddleware.js] - Authentication error, client disconnected - ID: ${socket.id}`)
+        return next (new Error(`[uibuilder:sioMiddleware.js] - Authentication error, client disconnected - ID: ${socket.id}` ))
+    }
+
+    return next()
+
+} // Remember to end with a `next()` statement or nothing will work.
+
+module.exports = sioMw