add following function

functions/follow.js

@@ -0,0 +1,50 @@
+const defaultApp = require('./defaultApp')
+const db = defaultApp.app.firestore();
+const app = (data, context) => {
+  //Adding or removing follow
+  console.log(data)
+  const docRef = db.collection('users').doc(data.username)
+  const checkToken = defaultApp.app.auth().verifyIdToken(data.token)
+  .then((decodedToken) => {
+    const uid = decodedToken.uid;
+    if(uid === data.uid) {
+      return true
+    } else {
+      return false;
+    }
+  }).catch(err => console.log(err))
+  if(checkToken) {
+    if(data.action === "unfollow") {
+      //removing follow
+      return docRef.get().then(res => res.data()).then(res => {
+        const filtered = res.following.filter(obj => {
+          return obj.username !== data.usernameToFollow
+        })
+        const following = res.following !== undefined ? filtered : []
+        return docRef.update({following: following})
+      }).catch(err => console.log(err))
+    } else if(data.action === "follow") {
+      //adding a follow
+      const user = [
+        { 
+          timestamp: Date.now(),
+          id: data.id,
+          username: data.usernameToFollow,
+          platform: data.platform,
+        }
+      ]
+      return docRef.get().then(res => res.data()).then(res => {
+        const find = res.following.find(obj => obj.username === data.usernameToFollow)
+        if(find) {
+          return void 0
+        }
+        const following = res.following !== undefined ? user.concat(res.following) : vote
+        return docRef.update({following: following})
+      }).catch(err => console.log(err))
+    }  
+  }
+
+};
+module.exports = {
+  app
+}

functions/index.js

@@ -8,11 +8,15 @@ const createProfileSteem = require('./createProfileSteem')
 const saveComment = require('./saveComment')
 const editTheme = require('./editTheme')
 const upvotePost = require('./upvotePost')
+const follow = require('./follow')
+const upvoteSteemPost = require('./upvoteSteemPost')
 
 exports.reciveToken = functions.https.onRequest(reciveToken.app);
 exports.deletePost = functions.https.onRequest(deletePost.app);
 exports.createProfile = functions.https.onCall(createProfile.app);
 exports.createProfileSteem = functions.https.onCall(createProfileSteem.app);
 exports.saveComment = functions.https.onCall(saveComment.app)
 exports.editTheme = functions.https.onCall(editTheme.app)
-exports.upvotePost = functions.https.onCall(upvotePost.app)
+exports.upvotePost = functions.https.onCall(upvotePost.app)
+exports.follow = functions.https.onCall(follow.app)
+exports.upvoteSteemPost = functions.https.onCall(upvoteSteemPost.app)