public async Task <string> UpdateGroup(ChatGroup chatGroup, string userId)
{
ChatGroup oldGroup = chatGroupList.GetGroupByGroupId(chatGroup.GroupId);
if (oldGroup != null)
{
if (oldGroup.HasId(userId))
{
//check creator id
if (chatGroup.CreatorId != oldGroup.CreatorId && userId != oldGroup.CreatorId)
{
return("You can't change creator id");
}
//check group name
if (chatGroup.GroupName != oldGroup.GroupName && userId != oldGroup.CreatorId)
{
return("You can't change group name");
}
oldGroup.CreatorId = chatGroup.CreatorId;
oldGroup.GroupName = chatGroup.GroupName;
await cloudDatabase.UpdateChatGroup(oldGroup);
await UpdateChatGroup(oldGroup);
return(null);
}
else
{
return("You are not a member in this chat group.");
}
}
else
{
return("Wrong group.");
}
}
public ChatGroup GetGroupByGroupId(string groupId)
{
return(chatGroupList.GetGroupByGroupId(groupId).Copy());
}