We are using the OAuthAuthorizationServerProvider class to do authorization in our ASP.NET Web Api app.

If the provided username and password is invalid in GrantResourceOwnerCredentials, the call

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

Produces the following Json result:

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

Is there any way to customize this error result?

I would like to make it consistent with default error message format used in other parts of the API:

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

Is this possible to achieve with the OAuthAuthorizationServerProvider?

 

2016年10月12日24分24秒

 

This is how I did it.

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);

 

2016年10月11日24分24秒

 

+1 for Dasun's answer. Here is how I extended it a bit further.

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);    }}

The .ToJsonString() is another extension method that uses the Newtonsoft.Json library.

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

Usage:

context.SetCustomError("something went wrong");

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