Identity: IdentityOptions should be inside an IOptionsSnapshot

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Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

If the user changes at runtime the IdentityOptions the changes are not reflected.

Expected Behavior

Changed IdentityOptions should be reflected.

Steps To Reproduce

1. Create a simple project dotnet new mvc --auth Individual.
2. At Program.cs

builder.Services.AddOptions<IdentityOptions>().BindConfiguration("Identity");

2. Create a User
3. Change the PasswordOptions. at appsettings.json or another configuration source.
4. Try to create another User with the changed options, they are not reflected until another restart.

Exceptions (if any)

No response

.NET Version

8.0.204

Anything else?

The cause is this constructor, it should be IOptionsSnapshot

aspnetcore/src/Identity/Extensions.Core/src/UserManager.cs

Line 70 in b83e1e1

IOptions<IdentityOptions> optionsAccessor,

[gumbarros]

Workaround if anyone needs, just inherit UserManager:

public class WebPortalUserManager<T>(
    IUserStore<T> store,
    IOptionsSnapshot<IdentityOptions> optionsAccessor,
    IPasswordHasher<T> passwordHasher,
    IEnumerable<IUserValidator<T>> userValidators,
    IEnumerable<IPasswordValidator<T>> passwordValidators,
    ILookupNormalizer keyNormalizer,
    IdentityErrorDescriber errors,
    IServiceProvider services,
    ILogger<UserManager<T>> logger)
    : UserManager<T>(store, optionsAccessor, passwordHasher, userValidators, passwordValidators, keyNormalizer, errors,
        services, logger)
    where T : class;
    

At Program.cs

builder.Services
    .AddIdentity<WebPortalIdentityUser, IdentityRole>()
    .AddEntityFrameworkStores<WebIdentityDbContext>()
    .AddErrorDescriber<IdentityPortugueseErrorDescriber>()
    .AddDefaultTokenProviders()
    .AddSignInManager<SignInManager<WebPortalIdentityUser>>() 
    .AddUserManager<WebPortalUserManager<WebPortalIdentityUser>>() //This will do the job.
    .AddUserStore<UserStore<WebPortalIdentityUser, IdentityRole, WebIdentityDbContext, string>>() 
    .AddRoleStore<RoleStore<IdentityRole, WebIdentityDbContext, string>>();