laatzen/LaaProductionWeb/LaaProductionWeb.Blazor/Components/Identity/Services/IdentityService.cs

namespace LaaProductionWeb.Blazor.Components.Identity.Services
{
    using Microsoft.AspNetCore.Components.Server.ProtectedBrowserStorage;
    using Microsoft.Extensions.Logging;

    using System;
    using System.Linq;
    using System.Security.Claims;
    using System.Threading.Tasks;

    public class IdentityService(ProtectedLocalStorage protectedLocalStorage, IdentityJwtService jwtService, ILogger<IdentityService> logger)
    {
        private readonly ProtectedLocalStorage protectedLocalStorage = protectedLocalStorage;
        private readonly IdentityJwtService jwtService = jwtService;
        private readonly ILogger<IdentityService> logger = logger;

        public async Task<ClaimsPrincipal> GetClaimsPrincipalAsync()
        {
            var claimsIdentity = new ClaimsIdentity();

            try
            {
                var tokenResult = await this.protectedLocalStorage
                    .GetAsync<string>(typeof(Program).Namespace, "JWT");
                var token = tokenResult.Success ? tokenResult.Value : default;
                var claims = this.jwtService.GetClaims(token);

                if (claims.Any())
                {
                    claimsIdentity = new ClaimsIdentity(
                          claims: claims
                        , authenticationType: ClaimTypes.NameIdentifier
                        , nameType: ClaimTypes.Name
                        , roleType: ClaimTypes.Role);
                }
            }
            catch (Exception e)
            {
                this.logger.LogError(e, e.Message);
            }

            return new ClaimsPrincipal(claimsIdentity); 
        }
    }
}