如何自定义OAuthAuthorizationServerProvider的错误消息？

Question

我们正在使用OAuthAuthorizationServerProvider该类在我们的ASP.NET Web Api应用程序中进行授权.

如果提供的用户名和密码无效GrantResourceOwnerCredentials,则通话

context.SetError( "invalid_grant", "The user name or password is incorrect." );

产生以下Json结果:

{
    "error": "invalid_grant",
    "error_description": "The user name or password is incorrect."
}

有没有办法自定义此错误结果？
我想使其与API的其他部分中使用的默认错误消息格式一致:

{
    "message": "Some error occurred."
}

这有可能实现OAuthAuthorizationServerProvider吗？

Answer 1

这就是我做到的.

string jsonString = "{\"message\": \"Some error occurred.\"}";

// This is just a work around to overcome an unknown internal bug. 
// In future releases of Owin, you may remove this.
context.SetError(new string(' ',jsonString.Length-12)); 

context.Response.StatusCode = 400;
context.Response.Write(jsonString);

Answer 2

给Dasun的答案+1.这是我如何进一步扩展它.

public class ErrorMessage
{
    public ErrorMessage(string message)
    {
        Message = message;
    }

    public string Message { get; private set; }
}

public static class ContextHelper
{
    public static void SetCustomError(this OAuthGrantResourceOwnerCredentialsContext context, string errorMessage)
    {
        var json = new ErrorMessage(errorMessage).ToJsonString();

        context.SetError(json);
        context.Response.Write(json);
    }
}

.ToJsonString()是另一个使用Newtonsoft.Json库的扩展方法.

public static string ToJsonString(this object obj)
    {
        return JsonConvert.SerializeObject(obj);
    }

用法:

context.SetCustomError("something went wrong");