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.gitignore

@@ -0,0 +1,3 @@
+node_modules/
+.cache/
+dist/

api/index.js

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+const {Server} = require('ws')
+
+const wss = new Server({port: 3714})
+
+const channels = {}
+const channelUsers = {}
+
+wss.on('connection', (ws, request) => {
+  let channel
+
+  const handlers = {
+    channel (next) {
+      channel = next
+      channels[channel] = channels[channel] || {}
+      channelUsers[channel] = channelUsers[channel] || []
+      channelUsers[channel].push(ws)
+      ws.send(JSON.stringify({
+        type: 'positions',
+        positions: channels[channel]
+      }))
+    },
+    position (id, x, y, z) {
+      channels[channel][id] = {x, y, z}
+      channelUsers[channel].forEach(user => {
+        user.send(JSON.stringify({
+          type: 'position',
+          position: [id, x, y, z]
+        }))
+      })
+    }
+  }
+
+  ws.on('message', message => {
+    const [type, ...data] = JSON.parse(message)
+    handlers[type](...data)
+  })
+})