attempt to edit firestore

firebase.json

@@ -1,16 +1,15 @@
 {
-  "hosting": {
-    "public": "build",
-    "ignore": [
-      "firebase.json",
-      "**/.*",
-      "**/node_modules/**"
-    ],
-    "rewrites": [
-      {
-        "source": "**",
-        "destination": "/index.html"
-      }
-    ]
-  }
+	"hosting": {
+		"public": "build",
+		"ignore": ["firebase.json", "**/.*", "**/node_modules/**"],
+		"rewrites": [
+			{
+				"source": "**",
+				"destination": "/index.html"
+			}
+		]
+	},
+	"firestore": {
+		"rules": "firestore.rules"
+	}
 }

firestore.rules

@@ -0,0 +1,28 @@
+rules_version = '2';
+service cloud.firestore {
+  match /databases/{database}/documents {
+
+    // by default disallow
+    match /{document=**} {
+      allow read, write: if false;
+    }
+
+    //chat
+    match /messages/{docId} {
+ 			allow read: if request.auth.uid != null;
+      allow create: if canCreateMessage();
+    }
+
+    function canCreateMessage() {
+      let isSignedIn = request.auth.uid != null;
+      let isOwner = request.auth.uid == request.resource.data.uid;
+      let isNotLong = request.resource.data.text.size() < 255;
+      let isNow = request.time == request.resource.data.createdAt;
+
+      let isNotBanned = /databases/$(database)/documents/User/$(request.auth.uid)/banned == false;
+
+      return isSignedIn && isOwner && isNotLong && isNow && isNotBanned;
+    }
+
+  }
+}