How to check if the called action has a specific attribute in ASP.Net Core? [closed]

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I am trying to build my custom authorization middle ware in ASP.Net Core. Which checks if the called action (method in controller class) is tagged by [Authorize] attribute. I still do not have good ideas how can I implement that.

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    app.Use((context, next) =>
    {
        // if (THE CALLED ACTION HAS [Authorize] attribute)
        //     DO SOMETHING...
        return next();
    });

    app.UseMvcWithDefaultRoute();     
}

Could some one give me any hint to implement the commented condition?

That early in pipeline the action has not been determined as yet so there is not even an action to check for attributes. — Nkosi
– Nkosi, Commented Nov 7, 2017 at 2:06
@Nkosi, ok so is it some how possible to get that working by implementing my own middle ware? — Mohammed Noureldin
– Mohammed Noureldin, Commented Nov 7, 2017 at 2:07
I would suggest reading up here learn.microsoft.com/en-us/aspnet/core/fundamentals/… — Nkosi
– Nkosi, Commented Nov 7, 2017 at 2:09
@Nkosi, actually I have just finished reading it before asking, but I still have not got it yet, sorry. Could you give any related hint? So how does MVC with its build in identity knows that something is tagged with [Authorize] attribute, when it is called before using MVC? I appreciate any hint which helps me to implement that. — Mohammed Noureldin
– Mohammed Noureldin, Commented Nov 7, 2017 at 2:16

Set · Accepted Answer · 2017-11-07 07:08:19Z

1

In general, if you need to check whether the action has an attribute, you need to use the action filter, not middleware.

Why? Cause action methods are part of MVC middleware and so action filters are. While standard middlewares don't know about MVC concept.

answered Nov 7, 2017 at 7:08

Set

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3 Comments

Mohammed Noureldin Over a year ago

How to check if the current called action has XZY attribute inside using the filter? Could you post some lines code please?

Set Over a year ago

@MohammedNoureldin look into SO Checking for an attribute in an action filter

Mohammed Noureldin Over a year ago

Ah perfect! Thank you!

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