CslaPermissionsPolicyProvider.cs

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//-----------------------------------------------------------------------
// <copyright file="CslaPermissionsPolicyProvider.cs" company="Marimer LLC">
//     Copyright (c) Marimer LLC. All rights reserved.
//     Website: https://cslanet.com
// </copyright>
// <summary>CSLA permissions policy provider</summary>
//-----------------------------------------------------------------------
 
using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authorization;
using Microsoft.Extensions.Options;
 
namespace Csla.Blazor
{
  public class CslaPermissionsPolicyProvider : IAuthorizationPolicyProvider
  {
    private readonly AuthorizationOptions _options;
 
    public CslaPermissionsPolicyProvider(IOptions<AuthorizationOptions> options)
    {
      if (options == null)
      {
        throw new ArgumentNullException(nameof(options));
      }
      
      _options = options.Value;
    }
 
    public Task<AuthorizationPolicy> GetDefaultPolicyAsync() => Task.FromResult(_options.DefaultPolicy);
    public Task<AuthorizationPolicy> GetFallbackPolicyAsync() => Task.FromResult(_options.FallbackPolicy);
 
    public Task<AuthorizationPolicy> GetPolicyAsync(string policyName)
    {
      var policy = _options.GetPolicy(policyName);
      if (policy is null && CslaPolicy.TryGetPermissionRequirement(policyName, out CslaPermissionRequirement requirement))
      {
        var policyBuilder = new AuthorizationPolicyBuilder();
        policyBuilder.AddRequirements(requirement);
        policy = policyBuilder.Build();
 
        _options.AddPolicy(policyName, policy);
      }
 
      return Task.FromResult(policy);
    }
  }
}