[FEAT]: Add support for Public Keys API

.gitignore

@@ -105,4 +105,7 @@ tools/*
 coverage-results/*
 
 # Rider
-**/.idea/*
+**/.idea/*
+
+# macOS
+.DS_Store

.vscode/settings.json

@@ -10,6 +10,9 @@
   "files.trimFinalNewlines": true,
   "files.insertFinalNewline": true,
   "editor.detectIndentation": false,
-  "editor.tabSize": 2,
-  "editor.insertSpaces": true
+  "editor.tabSize": 4,
+  "editor.insertSpaces": true,
+  "explorer.fileNesting.patterns": {
+    "*.cs": "I${capture}.cs",
+  },
 }

Octokit.Reactive/Clients/IObservableMetaClient.cs

@@ -10,6 +10,11 @@ namespace Octokit.Reactive
     /// </remarks>
     public interface IObservableMetaClient
     {
+        /// <summary>
+        /// Returns a client to get public keys for validating request signatures.
+        /// </summary>
+        IObservablePublicKeysClient PublicKeys { get; }
+
         /// <summary>
         /// Retrieves information about GitHub.com, the service or a GitHub Enterprise installation.
         /// </summary>

Octokit.Reactive/Clients/IObservablePublicKeysClient.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace Octokit.Reactive
+{
+    /// <summary>
+    /// A client for GitHub's meta public keys API.
+    /// </summary>
+    /// <remarks>
+    /// See the <a href="https://docs.github.com/code-security/secret-scanning/secret-scanning-partner-program#implement-signature-verification-in-your-secret-alert-service">Secret scanning documentation</a> for more details.
+    /// </remarks>
+    public interface IObservablePublicKeysClient
+    {
+        /// <summary>
+        /// Retrieves public keys for validating request signatures.
+        /// </summary>
+        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
+        /// <returns>An <see cref="MetaPublicKeys"/> containing public keys for validating request signatures.</returns>
+        IObservable<MetaPublicKeys> Get(PublicKeyType keysType);
+    }
+}

Octokit.Reactive/Clients/ObservableMetaClient.cs

@@ -18,9 +18,16 @@ public ObservableMetaClient(IGitHubClient client)
         {
             Ensure.ArgumentNotNull(client, nameof(client));
 
+            PublicKeys = new ObservablePublicKeysClient(client);
+
             _client = client.Meta;
         }
 
+        /// <summary>
+        /// Returns a client to manage get public keys for validating request signatures.
+        /// </summary>
+        public IObservablePublicKeysClient PublicKeys { get; private set; }
+
         /// <summary>
         /// Retrieves information about GitHub.com, the service or a GitHub Enterprise installation.
         /// </summary>

Octokit.Reactive/Clients/ObservablePublicKeysClient.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Reactive.Linq;
+using System.Reactive.Threading.Tasks;
+
+namespace Octokit.Reactive
+{
+    /// <summary>
+    /// A client for GitHub's public keys API.
+    /// </summary>
+    /// <remarks>
+    /// See the <a href="https://docs.github.com/code-security/secret-scanning/secret-scanning-partner-program#implement-signature-verification-in-your-secret-alert-service">Secret scanning documentation</a> for more details.
+    /// </remarks>
+    public class ObservablePublicKeysClient : IObservablePublicKeysClient
+    {
+        private readonly IPublicKeysClient _client;
+
+        public ObservablePublicKeysClient(IGitHubClient client)
+        {
+            Ensure.ArgumentNotNull(client, nameof(client));
+
+            _client = client.Meta.PublicKeys;
+        }
+
+        /// <summary>
+        /// Retrieves public keys for validating request signatures.
+        /// </summary>
+        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
+        /// <returns>An <see cref="MetaPublicKeys"/> containing public keys for validating request signatures.</returns>
+        public IObservable<MetaPublicKeys> Get(PublicKeyType keysType)
+        {
+            return _client.Get(keysType).ToObservable();
+        }
+    }
+}

Octokit.Tests.Integration/Clients/PublicKeysClientTest.cs

@@ -0,0 +1,28 @@
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Octokit.Tests.Integration.Clients
+{
+    public class PublicKeysClientTests
+    {
+        public class TheGetMethod
+        {
+            [IntegrationTest]
+            public async Task CanRetrievePublicKeys()
+            {
+                var github = Helper.GetAnonymousClient();
+
+                var result = await github.Meta.PublicKeys.Get(PublicKeyType.SecretScanning);
+
+                Assert.NotNull(result);
+                Assert.Equal(2, result.PublicKeys.Count);
+
+                Assert.NotNull(result.PublicKeys[0].KeyIdentifier);
+                Assert.NotNull(result.PublicKeys[0].Key);
+
+                Assert.NotNull(result.PublicKeys[1].KeyIdentifier);
+                Assert.NotNull(result.PublicKeys[1].Key);
+            }
+        }
+    }
+}

Octokit.Tests/Clients/PublicKeysClientTests.cs

@@ -0,0 +1,90 @@
+using System;
+using System.Threading.Tasks;
+using NSubstitute;
+using Xunit;
+
+namespace Octokit.Tests.Clients
+{
+    public class PublicKeysClientTests
+    {
+        public class TheCtor
+        {
+            [Fact]
+            public void EnsuresNonNullArguments()
+            {
+                Assert.Throws<ArgumentNullException>(() => new PublicKeysClient(null));
+            }
+        }
+
+        public class TheGetMethod
+        {
+            [Fact]
+            public async Task RequestsTheCorrectUrl()
+            {
+                var connection = Substitute.For<IApiConnection>();
+                var client = new PublicKeysClient(connection);
+
+                await client.Get(PublicKeyType.CopilotApi);
+
+                connection.Received()
+                    .Get<MetaPublicKeys>(Arg.Is<Uri>(u => u.ToString() == "meta/public_keys/copilot_api"));
+            }
+
+            [Fact]
+            public async Task RequestsCopilotApiPublicKeysEndpoint()
+            {
+                var publicKeys = new MetaPublicKeys(publicKeys: new[] {
+                    new MetaPublicKey("4fe6b016179b74078ade7581abf4e84fb398c6fae4fb973972235b84fcd70ca3", "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAELPuPiLVQbHY/clvpNnY+0BzYIXgo\nS0+XhEkTWUZEEznIVpS3rQseDTG6//gEWr4j9fY35+dGOxwOx3Z9mK3i7w==\n-----END PUBLIC KEY-----\n", true),
+                    new MetaPublicKey("df3454252d91570ae1bc597182d1183c7a8d42ff0ae96e0f2be4ba278d776546", "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEl5xbyr5bmETCJzqAvDnYl1ZKJrkf\n89Nyq5j06TTKrnHXXDw4FYNY1uF2S/w6EOaxbf9BxOidCLvjJ8ZgKzNpww==\n-----END PUBLIC KEY-----\n", false)
+                });
+
+                var apiConnection = Substitute.For<IApiConnection>();
+                apiConnection.Get<MetaPublicKeys>(Arg.Is<Uri>(u => u.ToString() == "meta/public_keys/copilot_api")).Returns(Task.FromResult(publicKeys));
+
+                var client = new PublicKeysClient(apiConnection);
+
+                var result = await client.Get(PublicKeyType.CopilotApi);
+
+                Assert.Equal(2, result.PublicKeys.Count);
+                Assert.Equal("4fe6b016179b74078ade7581abf4e84fb398c6fae4fb973972235b84fcd70ca3", result.PublicKeys[0].KeyIdentifier);
+                Assert.Equal("-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAELPuPiLVQbHY/clvpNnY+0BzYIXgo\nS0+XhEkTWUZEEznIVpS3rQseDTG6//gEWr4j9fY35+dGOxwOx3Z9mK3i7w==\n-----END PUBLIC KEY-----\n", result.PublicKeys[0].Key);
+                Assert.True(result.PublicKeys[0].IsCurrent);
+
+                Assert.Equal("df3454252d91570ae1bc597182d1183c7a8d42ff0ae96e0f2be4ba278d776546", result.PublicKeys[1].KeyIdentifier);
+                Assert.Equal("-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEl5xbyr5bmETCJzqAvDnYl1ZKJrkf\n89Nyq5j06TTKrnHXXDw4FYNY1uF2S/w6EOaxbf9BxOidCLvjJ8ZgKzNpww==\n-----END PUBLIC KEY-----\n", result.PublicKeys[1].Key);
+                Assert.False(result.PublicKeys[1].IsCurrent);
+
+                apiConnection.Received()
+                    .Get<MetaPublicKeys>(Arg.Is<Uri>(u => u.ToString() == "meta/public_keys/copilot_api"));
+            }
+
+            [Fact]
+            public async Task RequestSecretScanningPublicKeysEndpoint()
+            {
+                var publicKeys = new MetaPublicKeys(publicKeys: new[] {
+                    new MetaPublicKey("90a421169f0a406205f1563a953312f0be898d3c7b6c06b681aa86a874555f4a", "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE9MJJHnMfn2+H4xL4YaPDA4RpJqUq\nkCmRCBnYERxZanmcpzQSXs1X/AljlKkbJ8qpVIW4clayyef9gWhFbNHWAA==\n-----END PUBLIC KEY-----\n", false),
+                    new MetaPublicKey("bcb53661c06b4728e59d897fb6165d5c9cda0fd9cdf9d09ead458168deb7518c", "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEYAGMWO8XgCamYKMJS6jc/qgvSlAd\nAjPuDPRcXU22YxgBrz+zoN19MzuRyW87qEt9/AmtoNP5GrobzUvQSyJFVw==\n-----END PUBLIC KEY-----\n", true)
+                });
+
+                var apiConnection = Substitute.For<IApiConnection>();
+                apiConnection.Get<MetaPublicKeys>(Arg.Is<Uri>(u => u.ToString() == "meta/public_keys/secret_scanning")).Returns(Task.FromResult(publicKeys));
+
+                var client = new PublicKeysClient(apiConnection);
+
+                var result = await client.Get(PublicKeyType.SecretScanning);
+
+                Assert.Equal(2, result.PublicKeys.Count);
+                Assert.Equal("90a421169f0a406205f1563a953312f0be898d3c7b6c06b681aa86a874555f4a", result.PublicKeys[0].KeyIdentifier);
+                Assert.Equal("-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE9MJJHnMfn2+H4xL4YaPDA4RpJqUq\nkCmRCBnYERxZanmcpzQSXs1X/AljlKkbJ8qpVIW4clayyef9gWhFbNHWAA==\n-----END PUBLIC KEY-----\n", result.PublicKeys[0].Key);
+                Assert.False(result.PublicKeys[0].IsCurrent);
+
+                Assert.Equal("bcb53661c06b4728e59d897fb6165d5c9cda0fd9cdf9d09ead458168deb7518c", result.PublicKeys[1].KeyIdentifier);
+                Assert.Equal("-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEYAGMWO8XgCamYKMJS6jc/qgvSlAd\nAjPuDPRcXU22YxgBrz+zoN19MzuRyW87qEt9/AmtoNP5GrobzUvQSyJFVw==\n-----END PUBLIC KEY-----\n", result.PublicKeys[1].Key);
+                Assert.True(result.PublicKeys[1].IsCurrent);
+
+                apiConnection.Received()
+                    .Get<MetaPublicKeys>(Arg.Is<Uri>(u => u.ToString() == "meta/public_keys/secret_scanning"));
+            }
+        }
+    }
+}

Octokit.Tests/Models/MetaPublicKeysTests.cs

@@ -0,0 +1,44 @@
+using Octokit.Internal;
+using Xunit;
+
+namespace Octokit.Tests.Models
+{
+    public class MetaPublicKeysTests
+    {
+        [Fact]
+        public void CanBeDeserialized()
+        {
+            const string json = @"{
+  ""public_keys"": [
+    {
+      ""key_identifier"": ""90a421169f0a406205f1563a953312f0be898d3c7b6c06b681aa86a874555f4a"",
+      ""key"": ""-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE9MJJHnMfn2+H4xL4YaPDA4RpJqUq\nkCmRCBnYERxZanmcpzQSXs1X/AljlKkbJ8qpVIW4clayyef9gWhFbNHWAA==\n-----END PUBLIC KEY-----\n"",
+      ""is_current"": false
+    },
+    {
+      ""key_identifier"": ""bcb53661c06b4728e59d897fb6165d5c9cda0fd9cdf9d09ead458168deb7518c"",
+      ""key"": ""-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEYAGMWO8XgCamYKMJS6jc/qgvSlAd\nAjPuDPRcXU22YxgBrz+zoN19MzuRyW87qEt9/AmtoNP5GrobzUvQSyJFVw==\n-----END PUBLIC KEY-----\n"",
+      ""is_current"": true
+    }
+  ]
+}
+";
+            var serializer = new SimpleJsonSerializer();
+
+            var keys = serializer.Deserialize<MetaPublicKeys>(json);
+
+            Assert.NotNull(keys);
+            Assert.Equal(2, keys.PublicKeys.Count);
+
+            var key1 = keys.PublicKeys[0];
+            Assert.Equal("90a421169f0a406205f1563a953312f0be898d3c7b6c06b681aa86a874555f4a", key1.KeyIdentifier);
+            Assert.Equal("-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE9MJJHnMfn2+H4xL4YaPDA4RpJqUq\nkCmRCBnYERxZanmcpzQSXs1X/AljlKkbJ8qpVIW4clayyef9gWhFbNHWAA==\n-----END PUBLIC KEY-----\n", key1.Key);
+            Assert.False(key1.IsCurrent);
+
+            var key2 = keys.PublicKeys[1];
+            Assert.Equal("bcb53661c06b4728e59d897fb6165d5c9cda0fd9cdf9d09ead458168deb7518c", key2.KeyIdentifier);
+            Assert.Equal("-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEYAGMWO8XgCamYKMJS6jc/qgvSlAd\nAjPuDPRcXU22YxgBrz+zoN19MzuRyW87qEt9/AmtoNP5GrobzUvQSyJFVw==\n-----END PUBLIC KEY-----\n", key2.Key);
+            Assert.True(key2.IsCurrent);
+        }
+    }
+}

Octokit.Tests/Reactive/ObservablePublicKeysClientTests.cs

@@ -0,0 +1,33 @@
+using System;
+using NSubstitute;
+using Octokit.Reactive;
+using Xunit;
+
+namespace Octokit.Tests.Reactive
+{
+    public class ObservablePublicKeysClientTests
+    {
+        public class TheGetMethod
+        {
+            [Fact]
+            public void CallsIntoClient()
+            {
+                var gitHubClient = Substitute.For<IGitHubClient>();
+                var client = new ObservablePublicKeysClient(gitHubClient);
+
+                client.Get(PublicKeyType.SecretScanning);
+
+                gitHubClient.Meta.PublicKeys.Received(1).Get(PublicKeyType.SecretScanning);
+            }
+        }
+
+        public class TheCtor
+        {
+            [Fact]
+            public void EnsuresNonNullArguments()
+            {
+                Assert.Throws<ArgumentNullException>(() => new ObservablePublicKeysClient((IGitHubClient)null));
+            }
+        }
+    }
+}

Octokit/Clients/IMetaClient.cs

@@ -10,6 +10,11 @@ namespace Octokit
     /// </remarks>
     public interface IMetaClient
     {
+        /// <summary>
+        /// Returns a client to get public keys for validating request signatures.
+        /// </summary>
+        IPublicKeysClient PublicKeys { get; }
+
         /// <summary>
         /// Retrieves information about GitHub.com, the service or a GitHub Enterprise installation.
         /// </summary>

Octokit/Clients/IPublicKeysClient.cs

@@ -0,0 +1,20 @@
+using System.Threading.Tasks;
+
+namespace Octokit
+{
+    /// <summary>
+    /// A client for GitHub's meta public keys API.
+    /// </summary>
+    /// <remarks>
+    /// See the <a href="https://docs.github.com/code-security/secret-scanning/secret-scanning-partner-program#implement-signature-verification-in-your-secret-alert-service">Secret scanning documentation</a> for more details.
+    /// </remarks>
+    public interface IPublicKeysClient
+    {
+        /// <summary>
+        /// Retrieves public keys for validating request signatures.
+        /// </summary>
+        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
+        /// <returns>An <see cref="MetaPublicKeys"/> containing public keys for validating request signatures.</returns>
+        Task<MetaPublicKeys> Get(PublicKeyType keysType);
+    }
+}

Octokit/Clients/MetaClient.cs

@@ -18,8 +18,14 @@ public class MetaClient : ApiClient, IMetaClient
         public MetaClient(IApiConnection apiConnection)
             : base(apiConnection)
         {
+            PublicKeys = new PublicKeysClient(apiConnection);
         }
 
+        /// <summary>
+        /// Returns a client to manage get public keys for validating request signatures.
+        /// </summary>
+        public IPublicKeysClient PublicKeys { get; private set; }
+
         /// <summary>
         /// Retrieves information about GitHub.com, the service or a GitHub Enterprise installation.
         /// </summary>

Octokit/Clients/PublicKeysClient.cs

@@ -0,0 +1,33 @@
+using System.Threading.Tasks;
+
+namespace Octokit
+{
+    /// <summary>
+    /// A client for GitHub's public keys API.
+    /// </summary>
+    /// <remarks>
+    /// See the <a href="https://docs.github.com/code-security/secret-scanning/secret-scanning-partner-program#implement-signature-verification-in-your-secret-alert-service">Secret scanning documentation</a> for more details.
+    /// </remarks>
+    public class PublicKeysClient : ApiClient, IPublicKeysClient
+    {
+        /// <summary>
+        /// Initializes a new GitHub Meta Public Keys API client.
+        /// </summary>
+        /// <param name="apiConnection">An API connection.</param>
+        public PublicKeysClient(IApiConnection apiConnection)
+            : base(apiConnection)
+        {
+        }
+
+        /// <summary>
+        /// Retrieves public keys for validating request signatures.
+        /// </summary>
+        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
+        /// <returns>An <see cref="MetaPublicKeys"/> containing public keys for validating request signatures.</returns>
+        [ManualRoute("GET", "/meta/public_keys/{keysType}")]
+        public Task<MetaPublicKeys> Get(PublicKeyType keysType)
+        {
+            return ApiConnection.Get<MetaPublicKeys>(ApiUrls.PublicKeys(keysType));
+        }
+    }
+}