add functions, create and join room

functions/index.js

@@ -0,0 +1,98 @@
+const functions = require('firebase-functions');
+const admin = require('firebase-admin');
+const secret = require('./FirebaseSecret.json');
+const express = require('express');
+const cors = require('cors');
+
+const authenticator = (req,res,next) => {
+  if (req.method === 'OPTIONS') {
+    res.status(200).send();
+    return next();
+  }
+  
+  const token = req.headers.authorization.split(' ')[1];
+  const reqToken = token.split(':')[0];
+  const reqUid = token.split(':')[1];
+  admin.auth().verifyIdToken(reqToken).then( user => {
+    if (user.uid === reqUid) {
+      console.log('Verified Token - UID - ', reqUid);
+      if (req.method === 'POST') {
+        const bodydata = JSON.parse(req.body);
+        bodydata.uid = user.uid;
+        req.body = JSON.stringify(bodydata);
+      }
+      if (req.method === 'GET') {
+        req.body = JSON.stringify({uid: user.uid});
+      }
+      return next();
+    } else {
+      return res.status(401).send('Unauthorized');
+    }
+  }).catch(err => {
+    console.log('Failed Auth - ', req.headers.authorization, '\n', err);
+    return res.status(500).send(err);
+  });
+  return null;
+};
+
+const createRoom = async (req,res) => {
+  const bodydata = JSON.parse(req.body);
+  console.log('Requested Create - UID - ', bodydata.uid);
+  if (!bodydata.userName) res.status(400).send('Missing user name');
+  const roomId = await admin.firestore().collection('rooms').add({
+    name: bodydata.roomName,
+    createdAt: new Date().toISOString(),
+    updatedAt: new Date().toISOString(),
+  }).then(ref => ref.id)
+  .catch(err => {
+    console.error(err);
+  });
+  await admin.firestore().collection('rooms').doc(roomId).collection('messages').add({
+    uid: '<system>',
+    name: '',
+    text: `${bodydata.userName} started the party.`,
+    time: new Date().toISOString(),
+  });
+  await admin.firestore().collection('rooms').doc(roomId).collection('users').doc(bodydata.uid).set({
+    admin: true,
+    name: bodydata.userName,
+  });
+  res.status(201).send({ roomId });
+}
+
+const joinRoom = async (req, res) => {
+  const bodydata = JSON.parse(req.body);
+  console.log('Requested Create - UID - ', bodydata.uid, '\n\tRoom - ', bodydata.roomId);
+  const exists = await admin.firestore().collection('rooms').doc(bodydata.roomId).get().then(roomSnap => roomSnap.exists);
+  const userExists = await admin.firestore().collection('rooms').doc(bodydata.roomId).collection('users').doc(bodydata.uid).get().then(userSnap => userSnap.exists);
+  if (userExists) return res.status(200).send({roomId: bodydata.roomId});
+  if (exists && bodydata.roomId && bodydata.userName) {
+    await admin.firestore().collection('rooms').doc(bodydata.roomId).collection('messages').add({
+      uid: '<system>',
+      name: '',
+      text: `${bodydata.userName} joined the party.`,
+      time: new Date().toISOString(),
+    });
+    await admin.firestore().collection('rooms').doc(bodydata.roomId).collection('users').doc(bodydata.uid).set({
+      admin: false,
+      name: bodydata.userName,
+    });
+    res.status(200).send({roomId: bodydata.roomId});
+  }
+  if (!bodydata.userName) res.status(400).send('Missing user name');
+  else res.status(404).send('Party Not Found');
+}
+
+const app = express();
+app.use(cors({origin: true}));
+app.use(authenticator);
+
+admin.initializeApp({
+  credential: admin.credential.cert(secret),
+  databaseURL: "https://watch-party-crx.firebaseio.com"
+});
+
+app.post('/create', createRoom);
+app.post('/join', joinRoom);
+
+exports.widgets = functions.https.onRequest(app);