Added developer motivator sample

developer-motivator/README.md

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+# Send Firebase Cloud Messaging each time a new user open your app the first time or remove your app from his device.
+
+This sample demonstrates how to send a Firebase Cloud Messaging (FCM) notification from a Analytics triggered Function.
+
+
+## Functions Code
+
+See file [functions/index.js](functions/index.js) for the code.
+
+Sending the notification is done using the [Firebase Admin SDK](https://www.npmjs.com/package/firebase-admin).
+
+The dependencies are listed in [functions/package.json](functions/package.json).
+
+
+## Trigger rules
+
+The functions triggers every time a new user open your app the first time or remove your app from his device.

developer-motivator/database.rules.json

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+{
+  "rules": {
+    ".read": "auth != null",
+    ".write": "auth != null"
+  }
+}

developer-motivator/firebase.json

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+{
+  "database": {
+    "rules": "database.rules.json"
+  },
+  "hosting": {
+    "public": "public"
+  }
+}

developer-motivator/functions/index.js

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+'use strict';
+const admin = require('firebase-admin');
+const functions = require('firebase-functions');
+admin.initializeApp(functions.config().firebase);
+
+exports.appinstalled = functions.analytics.event('first_open').onLog(event => {
+    const payload = {
+      notification: {
+        title: 'new ' + event.data.user.deviceInfo.mobileModelName + ' from ' + event.data.user.geoInfo.city + ', ' + event.data.user.geoInfo.country,
+        body: 'new ' + event.data.user.deviceInfo.mobileModelName + ' from ' + event.data.user.geoInfo.city + ', ' + event.data.user.geoInfo.country
+      }
+    };
+
+     admin.messaging().sendToDevice("put_your_developer_device_token_here", payload).then(response => {
+      const tokensToRemove = [];
+      response.results.forEach((result, index) => {
+        const error = result.error;
+        if (error) {
+          console.error('Failure sending notification to', tokens[index], error);
+          if (error.code === 'messaging/invalid-registration-token' ||
+              error.code === 'messaging/registration-token-not-registered') {
+            tokensToRemove.push(tokensSnapshot.ref.child(tokens[index]).remove());
+          }
+        }
+      });
+    });
+});
+
+exports.appremoved = functions.analytics.event('app_remove').onLog(event => {
+    const payload = {
+      notification: {
+        title: 'lost ' + event.data.user.deviceInfo.mobileModelName + ' from ' + event.data.user.geoInfo.city + ', ' + event.data.user.geoInfo.country,
+        body: 'lost ' + event.data.user.deviceInfo.mobileModelName + ' from ' + event.data.user.geoInfo.city + ', ' + event.data.user.geoInfo.country
+      }
+    };
+
+     admin.messaging().sendToDevice("put_your_developer_device_token_here", payload).then(response => {
+      const tokensToRemove = [];
+      response.results.forEach((result, index) => {
+        const error = result.error;
+        if (error) {
+          console.error('Failure sending notification to', tokens[index], error);
+          if (error.code === 'messaging/invalid-registration-token' ||
+              error.code === 'messaging/registration-token-not-registered') {
+            tokensToRemove.push(tokensSnapshot.ref.child(tokens[index]).remove());
+          }
+        }
+      });
+    });
+
+});
+

developer-motivator/functions/package.json

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+{
+  "name": "developer-motivator-functions",
+  "description": "A simple developer motivator using Cloud Function and firebase analytics",
+  "dependencies": {
+    "firebase-admin": "^4.1.2",
+    "firebase-functions": "^0.5.1"
+  }
+}