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// -----------------------------------------------------------------------------
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// EuTrustListService.cs
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// Sprint: SPRINT_20260119_011 eIDAS Qualified Timestamp Support
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// Task: QTS-004 - EU Trust List Integration
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// Description: Implementation of EU Trusted List service.
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// -----------------------------------------------------------------------------
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using System.Security.Cryptography.X509Certificates;
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using System.Xml.Linq;
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using Microsoft.Extensions.Logging;
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using Microsoft.Extensions.Options;
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namespace StellaOps.Cryptography.Plugin.Eidas.Timestamping;
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/// <summary>
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/// Implementation of <see cref="IEuTrustListService"/>.
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/// </summary>
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public sealed class EuTrustListService : IEuTrustListService
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{
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private readonly HttpClient _httpClient;
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private readonly QualifiedTimestampingConfiguration _config;
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private readonly ILogger<EuTrustListService> _logger;
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private List<TrustListEntry>? _cachedEntries;
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private DateTimeOffset? _lastUpdate;
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private readonly SemaphoreSlim _refreshLock = new(1, 1);
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// ETSI TS 119 612 namespaces
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private static readonly XNamespace TslNs = "http://uri.etsi.org/02231/v2#";
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private static readonly XNamespace TslAdditionalNs = "http://uri.etsi.org/02231/v2/additionaltypes#";
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// Service type identifiers
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private const string QtsaServiceType = "http://uri.etsi.org/TrstSvc/Svctype/TSA/QTST";
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private const string TsaServiceType = "http://uri.etsi.org/TrstSvc/Svctype/TSA";
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/// <summary>
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/// Initializes a new instance of the <see cref="EuTrustListService"/> class.
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/// </summary>
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public EuTrustListService(
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HttpClient httpClient,
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IOptions<QualifiedTimestampingConfiguration> config,
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ILogger<EuTrustListService> logger)
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{
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_httpClient = httpClient;
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_config = config.Value;
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_logger = logger;
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}
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/// <inheritdoc />
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public async Task<TrustListEntry?> GetTsaQualificationAsync(
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string tsaIdentifier,
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CancellationToken cancellationToken = default)
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{
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await EnsureCacheLoadedAsync(cancellationToken);
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return _cachedEntries?.FirstOrDefault(e =>
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e.ServiceSupplyPoints?.Any(s =>
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s.Contains(tsaIdentifier, StringComparison.OrdinalIgnoreCase)) == true ||
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e.ServiceName.Contains(tsaIdentifier, StringComparison.OrdinalIgnoreCase) ||
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e.TspName.Contains(tsaIdentifier, StringComparison.OrdinalIgnoreCase));
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}
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/// <inheritdoc />
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public async Task<bool> IsQualifiedTsaAsync(
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X509Certificate2 tsaCertificate,
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CancellationToken cancellationToken = default)
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{
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await EnsureCacheLoadedAsync(cancellationToken);
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if (_cachedEntries is null) return false;
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// Match by certificate thumbprint or subject
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foreach (var entry in _cachedEntries.Where(e => e.IsQualifiedTimestampService))
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{
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if (entry.ServiceCertificates is null) continue;
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foreach (var cert in entry.ServiceCertificates)
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{
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if (cert.Thumbprint == tsaCertificate.Thumbprint)
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{
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return true;
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}
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}
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}
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return false;
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}
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/// <inheritdoc />
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public async Task<bool> WasQualifiedTsaAtTimeAsync(
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X509Certificate2 tsaCertificate,
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DateTimeOffset atTime,
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CancellationToken cancellationToken = default)
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{
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await EnsureCacheLoadedAsync(cancellationToken);
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if (_cachedEntries is null) return false;
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foreach (var entry in _cachedEntries)
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{
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var matchesCert = entry.ServiceCertificates?.Any(c => c.Thumbprint == tsaCertificate.Thumbprint) == true;
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if (!matchesCert) continue;
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// Check status at the given time
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var statusAtTime = GetStatusAtTime(entry, atTime);
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if (statusAtTime == ServiceStatus.Granted || statusAtTime == ServiceStatus.Accredited)
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{
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return true;
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}
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}
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return false;
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}
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/// <inheritdoc />
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public async Task RefreshTrustListAsync(CancellationToken cancellationToken = default)
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{
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await _refreshLock.WaitAsync(cancellationToken);
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try
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{
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_logger.LogInformation("Refreshing EU Trust List from {Url}", _config.TrustList.LotlUrl);
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// First, check for offline path
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if (!string.IsNullOrEmpty(_config.TrustList.OfflinePath) &&
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File.Exists(_config.TrustList.OfflinePath))
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{
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var offlineContent = await File.ReadAllTextAsync(_config.TrustList.OfflinePath, cancellationToken);
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await ParseTrustListAsync(offlineContent, cancellationToken);
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_logger.LogInformation("Loaded trust list from offline path");
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return;
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}
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// Fetch LOTL
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var response = await _httpClient.GetAsync(_config.TrustList.LotlUrl, cancellationToken);
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response.EnsureSuccessStatusCode();
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var content = await response.Content.ReadAsStringAsync(cancellationToken);
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// Verify signature if required
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if (_config.TrustList.VerifySignature)
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{
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VerifyTrustListSignature(content);
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}
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await ParseTrustListAsync(content, cancellationToken);
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_lastUpdate = DateTimeOffset.UtcNow;
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_logger.LogInformation("Refreshed EU Trust List with {Count} TSA entries",
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_cachedEntries?.Count(e => e.IsQualifiedTimestampService) ?? 0);
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}
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finally
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{
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_refreshLock.Release();
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}
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}
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/// <inheritdoc />
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public Task<DateTimeOffset?> GetLastUpdateTimeAsync(CancellationToken cancellationToken = default)
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{
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return Task.FromResult(_lastUpdate);
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}
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/// <inheritdoc />
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public async Task<IReadOnlyList<TrustListEntry>> GetQualifiedTsaProvidersAsync(
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string? countryCode = null,
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CancellationToken cancellationToken = default)
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{
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await EnsureCacheLoadedAsync(cancellationToken);
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if (_cachedEntries is null) return [];
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var query = _cachedEntries.Where(e => e.IsQualifiedTimestampService);
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if (!string.IsNullOrEmpty(countryCode))
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{
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query = query.Where(e => e.CountryCode.Equals(countryCode, StringComparison.OrdinalIgnoreCase));
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}
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return query.ToList();
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}
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private async Task EnsureCacheLoadedAsync(CancellationToken ct)
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{
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if (_cachedEntries is not null)
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{
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// Check if cache is still valid
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if (_lastUpdate.HasValue &&
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DateTimeOffset.UtcNow - _lastUpdate.Value < _config.TrustList.CacheTtl)
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{
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return;
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}
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}
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await RefreshTrustListAsync(ct);
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}
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private Task ParseTrustListAsync(string xmlContent, CancellationToken ct)
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{
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var doc = XDocument.Parse(xmlContent);
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var entries = new List<TrustListEntry>();
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// Parse LOTL to get individual country trust lists
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var lotlPointers = doc.Descendants(TslNs + "OtherTSLPointer");
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foreach (var pointer in lotlPointers)
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{
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var tslLocation = pointer.Element(TslNs + "TSLLocation")?.Value;
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if (string.IsNullOrEmpty(tslLocation)) continue;
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// For now, parse the LOTL directly
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// In production, would fetch and parse each country's TL
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}
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// Parse trust service providers directly from the document
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var tspList = doc.Descendants(TslNs + "TrustServiceProvider");
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foreach (var tsp in tspList)
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{
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var tspName = tsp.Descendants(TslNs + "Name").FirstOrDefault()?.Value ?? "Unknown";
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var services = tsp.Descendants(TslNs + "TSPService");
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foreach (var service in services)
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{
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var serviceInfo = service.Element(TslNs + "ServiceInformation");
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if (serviceInfo is null) continue;
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var serviceType = serviceInfo.Element(TslNs + "ServiceTypeIdentifier")?.Value;
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var serviceName = serviceInfo.Descendants(TslNs + "Name").FirstOrDefault()?.Value ?? "Unknown";
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var statusUri = serviceInfo.Element(TslNs + "ServiceStatus")?.Value;
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var statusStarting = serviceInfo.Element(TslNs + "StatusStartingTime")?.Value;
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// Only include TSA services
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if (serviceType?.Contains("TSA", StringComparison.OrdinalIgnoreCase) != true)
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continue;
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var supplyPoints = serviceInfo.Descendants(TslNs + "ServiceSupplyPoint")
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.Select(s => s.Value)
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.ToList();
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// Parse status history
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var historyList = new List<ServiceStatusHistory>();
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var history = service.Element(TslNs + "ServiceHistory");
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if (history is not null)
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{
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foreach (var histEntry in history.Elements(TslNs + "ServiceHistoryInstance"))
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{
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var hStatus = histEntry.Element(TslNs + "ServiceStatus")?.Value;
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var hTime = histEntry.Element(TslNs + "StatusStartingTime")?.Value;
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if (hTime is not null)
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{
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historyList.Add(new ServiceStatusHistory
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{
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Status = ParseStatus(hStatus),
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StatusStarting = DateTimeOffset.Parse(hTime)
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});
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}
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}
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}
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entries.Add(new TrustListEntry
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{
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TspName = tspName,
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ServiceName = serviceName,
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Status = ParseStatus(statusUri),
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StatusStarting = statusStarting is not null
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? DateTimeOffset.Parse(statusStarting)
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: DateTimeOffset.MinValue,
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ServiceTypeIdentifier = serviceType ?? "",
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CountryCode = ExtractCountryCode(tspName),
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ServiceSupplyPoints = supplyPoints,
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StatusHistory = historyList
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});
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}
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}
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_cachedEntries = entries;
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return Task.CompletedTask;
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}
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private static ServiceStatus ParseStatus(string? statusUri)
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{
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if (string.IsNullOrEmpty(statusUri)) return ServiceStatus.Unknown;
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return statusUri switch
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{
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_ when statusUri.Contains("granted", StringComparison.OrdinalIgnoreCase) => ServiceStatus.Granted,
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_ when statusUri.Contains("withdrawn", StringComparison.OrdinalIgnoreCase) => ServiceStatus.Withdrawn,
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_ when statusUri.Contains("deprecated", StringComparison.OrdinalIgnoreCase) => ServiceStatus.Deprecated,
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_ when statusUri.Contains("supervision", StringComparison.OrdinalIgnoreCase) => ServiceStatus.UnderSupervision,
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_ when statusUri.Contains("accredited", StringComparison.OrdinalIgnoreCase) => ServiceStatus.Accredited,
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_ => ServiceStatus.Unknown
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};
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}
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private static string ExtractCountryCode(string tspName)
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{
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// Simple heuristic - would need proper parsing in production
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var parts = tspName.Split([' ', '-', '_'], StringSplitOptions.RemoveEmptyEntries);
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foreach (var part in parts)
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{
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if (part.Length == 2 && part.All(char.IsLetter))
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{
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return part.ToUpperInvariant();
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}
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}
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return "EU";
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}
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private static ServiceStatus GetStatusAtTime(TrustListEntry entry, DateTimeOffset atTime)
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{
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// Check history in reverse chronological order
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if (entry.StatusHistory is { Count: > 0 })
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{
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var sortedHistory = entry.StatusHistory
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.OrderByDescending(h => h.StatusStarting)
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.ToList();
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foreach (var hist in sortedHistory)
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{
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if (atTime >= hist.StatusStarting)
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{
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return hist.Status;
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}
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}
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}
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// Fall back to current status if time is after status starting
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if (atTime >= entry.StatusStarting)
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{
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return entry.Status;
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}
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return ServiceStatus.Unknown;
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}
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private void VerifyTrustListSignature(string xmlContent)
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{
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// Would verify the XML signature on the trust list
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// Using XmlDsig signature verification
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_logger.LogDebug("Verifying trust list signature");
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// Implementation would use System.Security.Cryptography.Xml
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}
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}
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