Вытащил солюшен на уровень выше, чтобы прощё было дотнетить

Infrastructure/Auth/ServiceCollectionExtensions.cs

@@ -0,0 +1,22 @@
+using System.IdentityModel.Tokens.Jwt;
+using ApplicationLayer.InfrastructureServicesInterfaces;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Infrastructure.Auth;
+
+public static class ServiceCollectionExtensions
+{
+    public static IServiceCollection AddTokenGenerator(this IServiceCollection services, TokenGeneratorOptions options)
+    {
+            services.AddSingleton<JwtSecurityTokenHandler>();
+            services.AddSingleton<ITokenGenerator, TokenGenerator>(provider =>
+            {
+                var tokenHandler = provider.GetRequiredService<JwtSecurityTokenHandler>();
+                var dateTimeProvider = provider.GetRequiredService<IDateTimeProvider>();
+
+                return new TokenGenerator(options, tokenHandler, dateTimeProvider);
+            });
+
+            return services;
+        }
+}

Infrastructure/Auth/TokenGenerator.cs

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+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using ApplicationLayer.InfrastructureServicesInterfaces;
+using ApplicationLayer.Services.AuthServices.Common;
+using Domains.Users;
+
+namespace Infrastructure.Auth;
+
+/// <inheritdoc cref="ITokenGenerator"/>
+/// <param name="options">options kind of one in authorization registration in DI methods</param>
+/// <param name="tokenHandler">token handler</param>
+/// <param name="dateTimeProvider">date time provider</param>
+public class TokenGenerator(TokenGeneratorOptions options, JwtSecurityTokenHandler tokenHandler, IDateTimeProvider dateTimeProvider)
+    : ITokenGenerator
+{
+    /// <inheritdoc cref="ITokenGenerator.CreateToken"/>
+    public AuthToken CreateToken(User user)
+    {
+        var claims = new List<Claim>
+        {
+            new(ClaimTypes.Role, user.Role.ToString()),
+            new(ClaimTypes.NameIdentifier, user.Id.ToString())
+        };
+
+        var token = new JwtSecurityToken(
+            issuer: options.Issuer,
+            audience: options.Audience,
+            expires: dateTimeProvider.Now().Add(options.ValidTime),
+            signingCredentials: options.Credentials,
+            claims: claims);
+
+        return new AuthToken { Token = tokenHandler.WriteToken(token) };
+    }
+}

Infrastructure/Auth/TokenGeneratorOptions.cs

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+using Microsoft.IdentityModel.Tokens;
+
+namespace Infrastructure.Auth;
+
+public record TokenGeneratorOptions(string Issuer, string Audience, TimeSpan ValidTime, SigningCredentials Credentials);