Primer commit de los tres flujos: Raspipeso, Servidor y Gestor de semaforos

2026-01-28 22:11:54 +01:00
parent 62d340d7e7
commit 57983096b1
72 changed files with 18931 additions and 2 deletions
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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
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+/**
+ * Template Socket.IO outbound per-msg middleware for uibuilder. Fn will be called for EVERY outbound msg from Node-RED/uibuilder to a client.
+ * UPDATED: 2022-04-01
+ *
+ * NOTES & WARNINGS:
+ *   1) This function is called whenever any instance of uibuilder sends a msg to any client.
+ *   2) You have to restart Node-RED if you change this file.
+ *   3) You can use this to make changes to the msg before it is sent.
+ *
+ * Allows you to process outgoing data to clients. Use it to add security/user data or anything else.
+ * 
+ * @param {object} msg The msg being seny by uibuilder to a client
+ * @param {string} url The uibuilder instance url
+ * @param {string} channel The socket.io channel being used
+ */
+ function sioMsgOutMw( msg, url, channel ) {
+
+    console.log('[uibuilder:Socket.IO:sioMsgOut.js] msg from server: ', msg, url, channel)
+
+}
+
+module.exports = sioMsgOutMw
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+/**
+ * Template Socket.IO `use` middleware for uibuilder. Fn will be called for EVERY inbound msg from a client to Node-RED/uibuilder.
+ * UPDATED: 2022-04-01
+ *
+ * NOTES & WARNINGS:
+ *   1) This function is called when a client sends a "packet" of data to the server.
+ *   2) Failing to either return or call `next()` will mean that your clients will never be able to get responses.
+ *   3) You can amend the incoming msg in this middleware.
+ *   4) An error in this function will probably cause Node-RED to fail to start at all.
+ *   5) You have to restart Node-RED if you change this file.
+ *   6) If you call `next( new Error('blah') )` The error is sent back to the client and further proessing of the incoming msg stops.
+ *   7) To use for authentication/authorisation with Express and sio connection middleware, create a common node.js module.
+ *
+ * Allows you to process incoming data from clients.
+ * 
+ * see: https://socket.io/docs/v4/server-api/#socketusefn
+ * see also: uibRoot/.config/sioMiddleware.js & sioMsgOut.js
+ *           and https://cheatsheetseries.owasp.org/cheatsheets/HTML5_Security_Cheat_Sheet.html#websocket-implementation-hints
+ * 
+ * @param {[string,Array<Object>]} data The channel name (strictly the event name) and args send by a client (Socket.IO calls it a "packet"). data[0] is the channel/event name, data[args][0] is the actual msg
+ * @param {function} next The callback to hand off to the next middleware
+ */
+function sioUseMw([ channel, ...args ], next) {
+
+    const msg = args[0]
+
+    console.log('[uibuilder:Socket.IO:sioUse.js] msg from client: ', 'Channel Name:', channel, ' Msg:', msg)
+
+    // Simplistic error example - looking for specific property on the inbound msg
+    if ( msg.i_am_an_error ) {
+        // The error is sent back to the client and further processing of the msg stops
+        next(new Error('Oops! Some kind of error happened'))
+        return
+    }
+
+    // You can amend the incoming msg
+    msg._test = 'added by sioUse.js middleware'
+    
+    next()
+
+} // Do not forget to end with a call to `next()` or clients will not be able to connect
+
+module.exports = sioUseMw
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+/**
+ * Template ExpressJS Middleware for uibuilder.
+ * UPDATED: 2022-04-01
+ *
+ * NOTES & WARNINGS:
+ *   1) This function is called EVERY TIME any web call is made to the URL defined by your uib instance.
+ *      So it should be kept short and efficient.
+ *   2) Failing to either return or call `next()` will cause an ExpressJS error.
+ *   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 sio connection middleware, create a common node.js module.
+ *
+ * Allows custom processing for authentication, session management, custom logging, etc.
+ * 
+ * @param {object} req The ExpressJS request object
+ * @param {object} res The ExpressJS result object
+ * @param {function} next The callback to hand off to the next middleware
+ */
+ function uibMw(req,res,next) {
+
+    console.log('[uibuilder:uibMiddleware.js] Custom ExpressJS middleware called.')
+    next()
+
+} // Do not forget to end with a call to `next()`
+
+module.exports = uibMw