Domain Entities for Dynamic Permissions Management

DynamicPermissionManagementEntities.cs

public abstract class Entity
{
    public long Id { get; set; }

    [SuppressMessage("ReSharper", "BaseObjectGetHashCodeCallInGetHashCode")]
    [SuppressMessage("ReSharper", "NonReadonlyMemberInGetHashCode")]
    public override int GetHashCode()
    {
        if (IsTransient())
            return base.GetHashCode();

        unchecked
        {
            var hash = GetType().GetHashCode(); //todo: this.GetRealType().GetHashCode();
            return (hash * 31) ^ Id.GetHashCode();
        }
    }

    public bool IsTransient()
    {
        return Id == 0;
    }

    public override bool Equals(object obj)
    {
        if (!(obj is Entity other)) return false;

        if (ReferenceEquals(this, other)) return true;

        var typeOfThis = GetType(); //todo: this.GetRealType();
        var typeOfOther = obj.GetType(); //todo: other.GetRealType();

        if (typeOfThis != typeOfOther) return false;

        if (IsTransient() || other.IsTransient()) return false;

        return Id.Equals(other.Id);
    }

    public override string ToString()
    {
        return $"[{GetType().Name/*todo: this.GetRealType().Name*/} : {Id}]";
    }

    public static bool operator ==(Entity left, Entity right)
    {
        return Equals(left, right);
    }

    public static bool operator !=(Entity left, Entity right)
    {
        return !(left == right);
    }

}

/// <summary>
/// for TPH inheritance style
/// </summary>
public abstract class PermissionSetting : Entity
{
    /// <summary>
    /// Unique Name of the Permission
    /// </summary>
    public string Name { get; set; }
    /// <summary>
    /// Indicate This Permission Is Granted With Role/User or Not
    /// </summary>
    public bool IsGranted { get; set; }
}

public class RolePermissionSetting : PermissionSetting
{
    public Role Role { get; set; }
    public long? RoleId { get; set; }
}

public class Role : Entity
{
    public string Name { get; set; }
    public bool IsDefault { get; set; }
    public bool IsSystemEntry { get; set; }
    public byte[] RowVersion { get; set; }
    public ICollection<UserRole> Users { get; set; } = new HashSet<UserRole>();
    public ICollection<RolePermissionSetting> Permissions { get; set; } = new HashSet<RolePermissionSetting>();
}

public class UserPermissionSetting : PermissionSetting
{
    public User User { get; set; }
    public long? UserId { get; set; }
}

public class User : Entity
{
    public string FriendlyName { get; set; }
    public string UserName { get; set; }
    public string Email { get; set; }
    public byte[] PhotoFile { get; set; }
    public bool EmailConfirmed { get; set; }
    public string PasswordHash { get; set; }
    public string SecurityStamp { get; set; }
    public string PhoneNumber { get; set; }
    public bool PhoneNumberConfirmed { get; set; }
    public bool TwoFactorEnabled { get; set; }
    public DateTimeOffset? LockoutEndDateTime { get; set; }
    public bool LockoutEnabled { get; set; }
    public int AccessFailedCount { get; set; }
    public bool IsActive { get; set; } = true;
    public bool IsSystemEntry { get; set; }
    public byte[] RowVersion { get; set; }
    public ICollection<UserRole> Roles { get; set; } = new HashSet<UserRole>();
    public ICollection<UserPermissionSetting> Permissions { get; set; } = new HashSet<UserPermissionSetting>();
}

public class UserRole : Entity
{
    public Role Role { get; set; }
    public long RoleId { get; set; }
    public User User { get; set; }
    public long UserId { get; set; }
}

PermissionNames.cs

public static class PermissionNames
{
    public const string Pages = nameof(Pages);
    public const string Pages_Administration = nameof(Pages_Administration);
    public const string Pages_Administration_Roles = nameof(Pages_Administration_Roles);
    public const string Pages_Administration_Roles_Create = nameof(Pages_Administration_Roles_Create);
    public const string Pages_Administration_Roles_Edit = nameof(Pages_Administration_Roles_Create);
    public const string Pages_Administration_Roles_Delete = nameof(Pages_Administration_Roles_Create);
    public const string Pages_Administration_Users = nameof(Pages_Administration_Users);
    public const string Pages_Administration_Users_Create = nameof(Pages_Administration_Users_Create);
    public const string Pages_Administration_Users_Edit = nameof(Pages_Administration_Users_Create);
    public const string Pages_Administration_Users_Delete = nameof(Pages_Administration_Users_Create);
    //...
}