firestore-rules.txt

service cloud.firestore {
  match /databases/{database}/documents {
    match /rooms/{roomID} {
    	allow get;
    	allow list: if resource.data.public ||
      	resource.data.owner == request.auth.uid;
      allow create: if request.auth != null &&
      	request.resource.data.owner == request.auth.uid &&
        request.resource.data.title is string &&
        request.resource.data.title.size() > 1 &&
        request.resource.data.title.size() < 64 &&
        request.resource.data.public is bool &&
        request.resource.data.usersOnline is number &&
        !exists(/databases/$(database)/documents/rooms/$(roomID));
      allow update: if request.auth != null &&
        request.resource.data.title is string &&
        request.resource.data.title.size() > 1 &&
        request.resource.data.title.size() < 64 &&
        request.resource.data.public is bool &&
        resource.data.owner == request.auth.uid &&
        request.resource.data.owner == resource.data.owner; // Can't change owner
      allow delete: if request.auth != null &&
      	resource.data.owner == request.auth.uid;
    }
    match /user_settings/{userID} {
    	function isValidRoomId(index) {
      	return request.resource.data.roomHistory[index].id is string &&
          request.resource.data.roomHistory[index].id.size() < 33 &&
          request.resource.data.roomHistory[index].title is string &&
          request.resource.data.roomHistory[index].title.size() < 65;
      }
    	function isValidHistory() {
      	return request.resource.data.roomHistory is list &&
          request.resource.data.roomHistory.size() < 5 &&
          request.resource.data.roomHistory.size() < 1 ||
          (
          	request.resource.data.roomHistory.size() == 1 &&
            isValidRoomId(0)
          ) ||
          (
          	request.resource.data.roomHistory.size() == 2 &&
            isValidRoomId(0) &&
            isValidRoomId(1)
          ) ||
          (
          	request.resource.data.roomHistory.size() == 3 &&
            isValidRoomId(0) &&
            isValidRoomId(1) &&
            isValidRoomId(2)
          ) ||
          (
          	request.resource.data.roomHistory.size() == 4 &&
            isValidRoomId(0) &&
            isValidRoomId(1) &&
            isValidRoomId(2) &&
            isValidRoomId(3)
          );
      }
      allow create: if request.auth != null &&
        request.auth.uid == userID && 
        request.resource.data.darkMode is bool &&
        isValidHistory() &&
        request.resource.data.version is string &&
        request.resource.data.version.size() < 6;
      allow update: if request.auth != null &&
      	request.auth.uid == userID &&
        request.resource.data.darkMode is bool &&
        isValidHistory() &&
        request.resource.data.version is string &&
        request.resource.data.version.size() < 6;
      allow read: if request.auth != null &&
      	request.auth.uid == userID;
    }
  }
}