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src/StellaOps.Cli/Services/AuthorityRevocationClient.cs

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+using System;
+using System.Buffers.Text;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
+using StellaOps.Auth.Client;
+using StellaOps.Cli.Configuration;
+using StellaOps.Cli.Services.Models;
+
+namespace StellaOps.Cli.Services;
+
+internal sealed class AuthorityRevocationClient : IAuthorityRevocationClient
+{
+    private static readonly JsonSerializerOptions SerializerOptions = new(JsonSerializerDefaults.Web);
+    private static readonly TimeSpan TokenRefreshSkew = TimeSpan.FromSeconds(30);
+
+    private readonly HttpClient httpClient;
+    private readonly StellaOpsCliOptions options;
+    private readonly ILogger<AuthorityRevocationClient> logger;
+    private readonly IStellaOpsTokenClient? tokenClient;
+    private readonly object tokenSync = new();
+
+    private string? cachedAccessToken;
+    private DateTimeOffset cachedAccessTokenExpiresAt = DateTimeOffset.MinValue;
+
+    public AuthorityRevocationClient(
+        HttpClient httpClient,
+        StellaOpsCliOptions options,
+        ILogger<AuthorityRevocationClient> logger,
+        IStellaOpsTokenClient? tokenClient = null)
+    {
+        this.httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
+        this.options = options ?? throw new ArgumentNullException(nameof(options));
+        this.logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        this.tokenClient = tokenClient;
+
+        if (!string.IsNullOrWhiteSpace(options.Authority?.Url) && httpClient.BaseAddress is null && Uri.TryCreate(options.Authority.Url, UriKind.Absolute, out var authorityUri))
+        {
+            httpClient.BaseAddress = authorityUri;
+        }
+    }
+
+    public async Task<AuthorityRevocationExportResult> ExportAsync(bool verbose, CancellationToken cancellationToken)
+    {
+        EnsureAuthorityConfigured();
+
+        using var request = new HttpRequestMessage(HttpMethod.Get, "internal/revocations/export");
+        var accessToken = await AcquireAccessTokenAsync(cancellationToken).ConfigureAwait(false);
+        if (!string.IsNullOrWhiteSpace(accessToken))
+        {
+            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
+        }
+
+        using var response = await httpClient.SendAsync(request, cancellationToken).ConfigureAwait(false);
+        if (!response.IsSuccessStatusCode)
+        {
+            var body = await response.Content.ReadAsStringAsync(cancellationToken).ConfigureAwait(false);
+            var message = $"Authority export request failed with {(int)response.StatusCode} {response.ReasonPhrase}: {body}";
+            throw new InvalidOperationException(message);
+        }
+
+        var payload = await JsonSerializer.DeserializeAsync<ExportResponseDto>(
+            await response.Content.ReadAsStreamAsync(cancellationToken).ConfigureAwait(false),
+            SerializerOptions,
+            cancellationToken).ConfigureAwait(false);
+
+        if (payload is null)
+        {
+            throw new InvalidOperationException("Authority export response payload was empty.");
+        }
+
+        var bundleBytes = Convert.FromBase64String(payload.Bundle.Data);
+        var digest = payload.Digest?.Value ?? string.Empty;
+
+        if (verbose)
+        {
+            logger.LogInformation("Received revocation export sequence {Sequence} (sha256:{Digest}, signing key {KeyId}).", payload.Sequence, digest, payload.SigningKeyId ?? "<unspecified>");
+        }
+
+        return new AuthorityRevocationExportResult
+        {
+            BundleBytes = bundleBytes,
+            Signature = payload.Signature?.Value ?? string.Empty,
+            Digest = digest,
+            Sequence = payload.Sequence,
+            IssuedAt = payload.IssuedAt,
+            SigningKeyId = payload.SigningKeyId
+        };
+    }
+
+    private async Task<string?> AcquireAccessTokenAsync(CancellationToken cancellationToken)
+    {
+        if (tokenClient is null)
+        {
+            return null;
+        }
+
+        lock (tokenSync)
+        {
+            if (!string.IsNullOrEmpty(cachedAccessToken) && cachedAccessTokenExpiresAt - TokenRefreshSkew > DateTimeOffset.UtcNow)
+            {
+                return cachedAccessToken;
+            }
+        }
+
+        var scope = AuthorityTokenUtilities.ResolveScope(options);
+        var token = await RequestAccessTokenAsync(scope, cancellationToken).ConfigureAwait(false);
+
+        lock (tokenSync)
+        {
+            cachedAccessToken = token.AccessToken;
+            cachedAccessTokenExpiresAt = token.ExpiresAtUtc;
+            return cachedAccessToken;
+        }
+    }
+
+    private async Task<StellaOpsTokenResult> RequestAccessTokenAsync(string scope, CancellationToken cancellationToken)
+    {
+        if (options.Authority is null)
+        {
+            throw new InvalidOperationException("Authority credentials are not configured.");
+        }
+
+        if (!string.IsNullOrWhiteSpace(options.Authority.Username))
+        {
+            if (string.IsNullOrWhiteSpace(options.Authority.Password))
+            {
+                throw new InvalidOperationException("Authority password must be configured or run 'auth login'.");
+            }
+
+            return await tokenClient!.RequestPasswordTokenAsync(
+                options.Authority.Username,
+                options.Authority.Password!,
+                scope,
+                cancellationToken).ConfigureAwait(false);
+        }
+
+        return await tokenClient!.RequestClientCredentialsTokenAsync(scope, cancellationToken).ConfigureAwait(false);
+    }
+
+    private void EnsureAuthorityConfigured()
+    {
+        if (string.IsNullOrWhiteSpace(options.Authority?.Url))
+        {
+            throw new InvalidOperationException("Authority URL is not configured. Set STELLAOPS_AUTHORITY_URL or update stellaops.yaml.");
+        }
+
+        if (httpClient.BaseAddress is null)
+        {
+            if (!Uri.TryCreate(options.Authority.Url, UriKind.Absolute, out var baseUri))
+            {
+                throw new InvalidOperationException("Authority URL is invalid.");
+            }
+
+            httpClient.BaseAddress = baseUri;
+        }
+    }
+
+    private sealed class ExportResponseDto
+    {
+        [JsonPropertyName("schemaVersion")]
+        public string SchemaVersion { get; set; } = string.Empty;
+
+        [JsonPropertyName("bundleId")]
+        public string BundleId { get; set; } = string.Empty;
+
+        [JsonPropertyName("sequence")]
+        public long Sequence { get; set; }
+
+        [JsonPropertyName("issuedAt")]
+        public DateTimeOffset IssuedAt { get; set; }
+
+        [JsonPropertyName("signingKeyId")]
+        public string? SigningKeyId { get; set; }
+
+        [JsonPropertyName("bundle")]
+        public ExportPayloadDto Bundle { get; set; } = new();
+
+        [JsonPropertyName("signature")]
+        public ExportSignatureDto? Signature { get; set; }
+
+        [JsonPropertyName("digest")]
+        public ExportDigestDto? Digest { get; set; }
+    }
+
+    private sealed class ExportPayloadDto
+    {
+        [JsonPropertyName("data")]
+        public string Data { get; set; } = string.Empty;
+    }
+
+    private sealed class ExportSignatureDto
+    {
+        [JsonPropertyName("algorithm")]
+        public string Algorithm { get; set; } = string.Empty;
+
+        [JsonPropertyName("keyId")]
+        public string KeyId { get; set; } = string.Empty;
+
+        [JsonPropertyName("value")]
+        public string Value { get; set; } = string.Empty;
+    }
+
+    private sealed class ExportDigestDto
+    {
+        [JsonPropertyName("value")]
+        public string Value { get; set; } = string.Empty;
+    }
+}

src/StellaOps.Cli/Services/IAuthorityRevocationClient.cs

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+using System.Threading;
+using System.Threading.Tasks;
+using StellaOps.Cli.Services.Models;
+
+namespace StellaOps.Cli.Services;
+
+internal interface IAuthorityRevocationClient
+{
+    Task<AuthorityRevocationExportResult> ExportAsync(bool verbose, CancellationToken cancellationToken);
+}

src/StellaOps.Cli/Services/Models/AuthorityRevocationExportResult.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace StellaOps.Cli.Services.Models;
+
+internal sealed class AuthorityRevocationExportResult
+{
+    public required byte[] BundleBytes { get; init; }
+
+    public required string Signature { get; init; }
+
+    public required string Digest { get; init; }
+
+    public required long Sequence { get; init; }
+
+    public required DateTimeOffset IssuedAt { get; init; }
+
+    public string? SigningKeyId { get; init; }
+}