UA-.NETStandard/tests/Opc.Ua.Client.Tests/Session/CompositeClientIdentityProviderTests.cs

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using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using NUnit.Framework;
using Opc.Ua.Identity;
using Opc.Ua.Tests;

namespace Opc.Ua.Client.Tests.Identity
{
    [TestFixture]
    [Category("Identity")]
    public sealed class CompositeClientIdentityProviderTests
    {
        [Test]
        public async Task GetIdentityAsyncUsesRegistrationOrder()
        {
            UserTokenPolicy policy = CreatePolicy(UserTokenType.UserName);
            IdentitySelectionContext context = CreateContext(policy);
            var first = new StubProvider("first", UserTokenType.UserName, DateTime.UtcNow.AddMinutes(10));
            var second = new StubProvider("second", UserTokenType.UserName, DateTime.UtcNow.AddMinutes(5));
            var provider = new CompositeClientIdentityProvider(first, second);

            IUserIdentity identity = await provider.GetIdentityAsync(policy, context).ConfigureAwait(false);

            Assert.That(identity.DisplayName, Is.EqualTo("first"));
            Assert.That(first.GetIdentityCallCount, Is.EqualTo(1));
            Assert.That(second.GetIdentityCallCount, Is.Zero);
        }

        [Test]
        public async Task ExpiresAtAggregatesQueriedProviders()
        {
            DateTime later = DateTime.UtcNow.AddMinutes(10);
            DateTime earlier = DateTime.UtcNow.AddMinutes(5);
            var userName = new StubProvider("user", UserTokenType.UserName, later);
            var certificate = new StubProvider("cert", UserTokenType.Certificate, earlier);
            var provider = new CompositeClientIdentityProvider(userName, certificate);
            UserTokenPolicy userNamePolicy = CreatePolicy(UserTokenType.UserName);
            UserTokenPolicy certificatePolicy = CreatePolicy(UserTokenType.Certificate);

            await provider.GetIdentityAsync(userNamePolicy, CreateContext(userNamePolicy)).ConfigureAwait(false);
            Assert.That(provider.ExpiresAt, Is.EqualTo(later));

            await provider.GetIdentityAsync(certificatePolicy, CreateContext(certificatePolicy)).ConfigureAwait(false);
            Assert.That(provider.ExpiresAt, Is.EqualTo(earlier));
        }

        [Test]
        public void GetIdentityAsyncRejectsUnmatchedPolicy()
        {
            UserTokenPolicy policy = CreatePolicy(UserTokenType.Certificate);
            IdentitySelectionContext context = CreateContext(policy);
            var provider = new CompositeClientIdentityProvider(
                new StubProvider("user", UserTokenType.UserName, DateTime.MaxValue));

            ServiceResultException ex = Assert.ThrowsAsync<ServiceResultException>(
                async () => await provider.GetIdentityAsync(policy, context).ConfigureAwait(false));
            Assert.That(ex.StatusCode, Is.EqualTo(StatusCodes.BadIdentityTokenRejected));
        }

        private static UserTokenPolicy CreatePolicy(UserTokenType tokenType)
        {
            return new UserTokenPolicy
            {
                PolicyId = tokenType.ToString(),
                TokenType = tokenType,
                SecurityPolicyUri = SecurityPolicies.None
            };
        }

        private static IdentitySelectionContext CreateContext(UserTokenPolicy policy)
        {
            var endpoint = new EndpointDescription
            {
                SecurityPolicyUri = SecurityPolicies.None,
                UserIdentityTokens = [policy]
            };
            return new IdentitySelectionContext(
                endpoint,
                new[] { policy },
                ServiceMessageContext.CreateEmpty(NUnitTelemetryContext.Create()));
        }

        private sealed class StubProvider : IClientIdentityProvider
        {
            public StubProvider(string displayName, UserTokenType tokenType, DateTime expiresAt)
            {
                DisplayName = displayName;
                TokenType = tokenType;
                ExpiresAt = expiresAt;
            }

            public string DisplayName { get; }

            public UserTokenType TokenType { get; }

            public int GetIdentityCallCount { get; private set; }

            public IReadOnlyList<UserTokenType> SupportedTokenTypes => [TokenType];

            public IReadOnlyList<string> SupportedIssuedTokenProfileUris => [];

            public DateTime ExpiresAt { get; }

            public ValueTask<CanSatisfyResult> CanSatisfyAsync(
                UserTokenPolicy policy,
                IdentitySelectionContext context,
                CancellationToken ct = default)
            {
                return new ValueTask<CanSatisfyResult>(
                    policy.TokenType == TokenType
                        ? CanSatisfyResult.Yes
                        : CanSatisfyResult.No(
                            $"TokenTypeNotSupported (provider handles {TokenType}, policy is {policy.TokenType})."));
            }

            public ValueTask<IUserIdentity> GetIdentityAsync(
                UserTokenPolicy policy,
                IdentitySelectionContext context,
                CancellationToken ct = default)
            {
                GetIdentityCallCount++;
                var identity = new UserIdentity(DisplayName, "password"u8)
                {
                    PolicyId = policy.PolicyId
                };
                return new ValueTask<IUserIdentity>(identity);
            }
        }
    }
}