git commit -m "Initial commit for meeting status indicator"

Author: AlabasterAxe

.gitignore

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+blog_post/

.vscode/arduino.json

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+{
+    "port": "COM3",
+    "board": "adafruit:nrf52:cplaynrf52840",
+    "configuration": "softdevice=s140v6,debug=l1",
+    "sketch": "arduino\\Blink\\Blink.ino"
+}

.vscode/c_cpp_properties.json

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+{
+    "configurations": [
+        {
+            "name": "Win32",
+            "includePath": [
+                "C:\\Users\\matth\\AppData\\Local\\Arduino15\\packages\\adafruit\\tools\\**",
+                "C:\\Users\\matth\\AppData\\Local\\Arduino15\\packages\\adafruit\\hardware\\nrf52\\0.19.0\\**"
+            ],
+            "forcedInclude": [],
+            "intelliSenseMode": "msvc-x64",
+            "compilerPath": "C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.24.28314/bin/Hostx64/x64/cl.exe",
+            "cStandard": "c11",
+            "cppStandard": "c++17"
+        }
+    ],
+    "version": 4
+}

arduino/Blink/Blink.ino

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+/*
+ */
+
+#include <Adafruit_NeoPixel.h>
+
+#define PIN 8
+#define NUMPIXELS 10
+#define DELAYVAL 100  // Time (in milliseconds) to pause between pixels
+
+Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
+
+char receivedChar;
+boolean newData = false;
+uint32_t available = pixels.Color(0, 50, 0);
+uint32_t busy = pixels.Color(50, 0, 0);
+
+// the setup function runs once when you press reset or power the board
+void setup() {
+  // initialize digital pin LED_BUILTIN as an output.
+  Serial.begin(9600);
+  Serial.println("<Arduino is ready>");
+  pixels.begin();  // INITIALIZE NeoPixel strip object (REQUIRED)
+}
+
+void loop() {
+  recvOneChar();
+  showNewData();
+}
+
+void recvOneChar() {
+  if (Serial.available() > 0) {
+    receivedChar = Serial.read();
+    newData = true;
+  }
+}
+
+void showNewData() {
+  if (newData == true) {
+    pixels.clear();  // Set all pixel colors to 'off'
+    Serial.print("This just in ... ");
+    Serial.println(receivedChar);
+
+    bool shouldUpdate = false;
+    uint32_t newColor;
+
+    if (receivedChar == 'n') {
+      digitalWrite(LED_BUILTIN, HIGH);
+      newColor = busy;
+      shouldUpdate = true;
+    } else if (receivedChar == 'f') {
+      digitalWrite(LED_BUILTIN, LOW);
+      newColor = available;
+      shouldUpdate = true;
+    }
+    newData = false;
+    if (shouldUpdate) {
+      for (int i = 0; i < NUMPIXELS; i++) {  // For each pixel...
+
+        // pixels.Color() takes RGB values, from 0,0,0 up to 255,255,255
+        // Here we're using a moderately bright green color:
+        pixels.setPixelColor(i, newColor);
+
+        pixels.show();  // Send the updated pixel colors to the hardware.
+
+        delay(DELAYVAL);  // Pause before next pass through loop
+      }
+    }
+  }
+}

arduino/Blink/code.py

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+'use strict';
+
+const HANGOUTS_PREFIX = "https://hangouts.google.com/call/";
+const DEFAULT_SIGN_ENDPOINT = "http://192.168.1.22:5000";
+
+function handleRemovedTab(tabId, existingHangouts, signEndpoint) {
+  const tabIdx = existingHangouts.indexOf(tabId);
+  if (tabIdx >= 0) {
+    existingHangouts.splice(tabIdx)
+    if (existingHangouts.length === 0) {
+      fetch(signEndpoint + "/off", {
+        mode: "no-cors"
+      });
+    }
+  }
+}
+
+  chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
+    if (changeInfo.url) {
+      chrome.storage.local.get(null, (value) => {
+        const existingHangouts = value ? value.hangouts || [] : [];
+        const signEndpoint = value ? value.endpoint || DEFAULT_SIGN_ENDPOINT : DEFAULT_SIGN_ENDPOINT;
+        if (changeInfo.url.startsWith(HANGOUTS_PREFIX)) {
+          if (existingHangouts.length === 0) {
+            fetch(signEndpoint + "/on", {
+              mode: "no-cors"
+            });
+          }
+          existingHangouts.push(tabId);
+        } else {
+          handleRemovedTab(tabId, existingHangouts, signEndpoint);
+        }
+        chrome.storage.local.set({hangouts: Array.from(new Set(existingHangouts))});
+      });
+    }
+  });
+
+  chrome.tabs.onRemoved.addListener((tabId) => {
+    chrome.storage.local.get(null, (value) => {
+      const existingHangouts = value ? value.hangouts || [] : [];
+        const signEndpoint = value ? value.endpoint || DEFAULT_SIGN_ENDPOINT : DEFAULT_SIGN_ENDPOINT;
+      handleRemovedTab(tabId, existingHangouts, signEndpoint);
+      chrome.storage.local.set({hangouts: existingHangouts});
+    });
+  });

chrome_extension/background.js

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+{
+  "name": "Meeting Status Notifier",
+  "version": "1.0",
+  "description": "notify people of the meeting status",
+  "permissions": ["tabs", "storage"],
+  "background" : {
+    "scripts": ["background.js"],
+    "persistent": false
+  },
+  "browser_action": {
+    "default_popup": "popup.html"
+  },
+  "manifest_version": 2
+}

chrome_extension/manifest.json

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+  <!DOCTYPE html>
+  <html>
+    <head>
+    </head>
+    <body>
+      <input type="text" id="endpoint">
+      <button id="setEndpoint">Set Endpoint</button>
+      <script src="popup.js"></script>
+    </body>
+  </html>

chrome_extension/popup.html

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+let setEndpoint = document.getElementById('setEndpoint');
+let endpointElement = document.getElementById('endpoint');
+
+setEndpoint.onclick = () => {
+  let endpoint = endpointElement.value;
+  chrome.storage.local.set({endpoint: endpoint});
+};
+
+chrome.storage.local.get(null, (data)=>{
+  if (data && data.endpoint) {
+    endpointElement.innerText = data.endpoint;
+  }
+})