async Task <User> FindUserAsync()
{
string key = null;
string email = null;
string vanityName = null;
if (userKeyRegex.IsMatch(UserIdentifier))
{
key = UserIdentifier;
}
else if (UserIdentifier.IndexOf('@') > 0)
{
email = UserIdentifier;
}
else
{
vanityName = UserIdentifier;
}
User user = null;
if (key != null)
{
user = await api.GetObjectAsync <User> (key);
if (user == null)
{
vanityName = key;
}
}
if (user == null)
{
user = await api.FindUserAsync(email, vanityName);
if (user == null)
{
throw new UserNotFoundException(UserIdentifier);
}
}
if (user.IsProtected)
{
throw new UserIsProtectedException(user);
}
return(user);
}