How to access dbcontext & session in Custom Policy-Based Authorization

Question

Is it possible that we can access dbcontext to get my table data and session in custom Policy-Based Authorization? Anyone can help how to achieve it?

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Answer 1

Policies can use DI

So, assuming your db context is in DI you could do something like

public class CheckAuthorizeHandler : AuthorizationHandler<CheckAuthorizeRequirement>
{
    MyContext _context;

    public CheckAuthorizeHandler(MyContext context)
    {
        _context = context;
    }

    protected override Task HandleRequirementAsync(
        AuthorizationHandlerContext context, 
        MyRequirement requirement)
    {
        // Do something with _context
        // Check if the requirement is fulfilled.
        return Task.CompletedTask;
    }
}

Note that when you do this you have to make your requirement a seperate class, you can't do CheckAuthorize : AuthorizationHandler<CheckAuthorize>, IAuthorizationRequirement, so you'd have to do

public CheckAuthorizeRequirement : IAuthorizationRequirement
{
}

And finally you need to register your handler in the DI system

services.AddTransient<IAuthorizationHandler, CheckAuthorizeHandler>();