/// <summary>
/// Authenticates and returns user info.
/// </summary>
/// <returns>
/// The user info, including username and token.
/// </returns>
/// <exception cref="System.InvalidOperationException">
/// Username is empty
/// or
/// Password is empty
/// </exception>
public override async Task<UserInfo> Authenticate()
{
if (string.IsNullOrWhiteSpace(Username))
{
throw new InvalidOperationException("Username is empty");
}
if (string.IsNullOrEmpty(Password))
{
throw new InvalidOperationException("Password is empty");
}
var uriBuilder = new UriBuilder("https://www.douban.com/service/auth2/token");
uriBuilder.AppendAuthenticationCommonFields(ServerConnection);
uriBuilder.AppendQuery(StringTable.GrantType, StringTable.Password);
uriBuilder.AppendQuery(StringTable.Username, Username);
uriBuilder.AppendQuery(StringTable.Password, Password);
var data = uriBuilder.RemoveQuery();
var jsonContent = await ServerConnection.Post(uriBuilder.Uri, data);
return ParseLogOnResult(jsonContent);
}
