New method on RepositoryCommits client - Get the sha1 of a commit reference

Octokit.Reactive/Clients/IObservableRepositoryCommitsClients.cs

@@ -43,5 +43,14 @@ public interface IObservableRepositoryCommitsClient
         /// <param name="request">Used to filter list of commits returned</param>
         /// <returns></returns>
         IObservable<GitHubCommit> GetAll(string owner, string name, CommitRequest request);
+
+        /// <summary>
+        /// Get the SHA-1 of a commit reference
+        /// </summary>
+        /// <param name="owner">The owner of the repository</param>
+        /// <param name="name">The name of the repository</param>
+        /// <param name="reference">The repository reference</param>
+        /// <returns></returns>
+        IObservable<string> GetSha1(string owner, string name, string reference);
     }
 }

Octokit.Reactive/Clients/ObservableRepositoryCommitsClients.cs

@@ -73,5 +73,21 @@ public IObservable<GitHubCommit> GetAll(string owner, string name, CommitRequest
             return _connection.GetAndFlattenAllPages<GitHubCommit>(ApiUrls.RepositoryCommits(owner, name),
                 request.ToParametersDictionary());
         }
+
+        /// <summary>
+        /// Get the SHA-1 of a commit reference
+        /// </summary>
+        /// <param name="owner">The owner of the repository</param>
+        /// <param name="name">The name of the repository</param>
+        /// <param name="reference">The repository reference</param>
+        /// <returns></returns>
+        public IObservable<string> GetSha1(string owner, string name, string reference)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
+            Ensure.ArgumentNotNullOrEmptyString(name, "name");
+            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");
+
+            return _commit.GetSha1(owner, name, reference).ToObservable();
+        }
     }
 }

Octokit.Tests.Integration/Clients/RepositoryCommitsClientTests.cs

@@ -87,6 +87,14 @@ public async Task CanGetCommitWithRenamedFiles()
                 .Where(file => file.Status == "renamed")
                 .All(file => string.IsNullOrEmpty(file.PreviousFileName) == false));
         }
+
+        [IntegrationTest]
+        public async Task CanGetSha1()
+        {
+            var sha1 = await _fixture.GetSha1("octokit", "octokit.net", "master");
+
+            Assert.NotNull(sha1);
+        }
     }
 
     public class TestsWithNewRepository : IDisposable
@@ -158,7 +166,17 @@ public async Task CanCompareUsingSha()
             Assert.Equal(0, result.BehindBy);
         }
 
-        async Task CreateTheWorld()
+        [IntegrationTest]
+        public async Task GetSha1FromRepository()
+        {
+            var reference = await CreateTheWorld();
+
+            var sha1 = await _fixture.GetSha1(Helper.UserName, _context.RepositoryName, "master");
+
+            Assert.Equal(reference.Object.Sha, sha1);
+        }
+
+        async Task<Reference> CreateTheWorld()
         {
             var master = await _github.Git.Reference.Get(Helper.UserName, _context.RepositoryName, "heads/master");
 
@@ -174,7 +192,7 @@ async Task CreateTheWorld()
             var newFeature = await CreateCommit("this is the commit to merge into the pull request", featureBranchTree.Sha, newMaster.Sha);
 
             // create branch
-            await _github.Git.Reference.Create(Helper.UserName, _context.RepositoryName, new NewReference("refs/heads/my-branch", newFeature.Sha));
+            return await _github.Git.Reference.Create(Helper.UserName, _context.RepositoryName, new NewReference("refs/heads/my-branch", newFeature.Sha));
         }
 
         async Task<TreeResponse> CreateTree(IDictionary<string, string> treeContents)

Octokit.Tests/Clients/RepositoriesClientTests.cs

@@ -790,5 +790,40 @@ public async Task EnsuresNonNullArguments()
                 await Assert.ThrowsAsync<ArgumentException>(() => client.EditBranch("owner", "repo", "", update));
             }
         }
+
+        public class TheSha1Method
+        {
+            [Fact]
+            public void EnsuresNonNullArguments()
+            {
+                var client = new RepositoryCommitsClient(Substitute.For<IApiConnection>());
+
+                Assert.ThrowsAsync<ArgumentException>(() => client.GetSha1("", "name", "reference"));
+                Assert.ThrowsAsync<ArgumentException>(() => client.GetSha1("owner", "", "reference"));
+                Assert.ThrowsAsync<ArgumentException>(() => client.GetSha1("owner", "name", ""));
+            }
+
+            [Fact]
+            public async Task EnsuresNonEmptyArguments()
+            {
+                var client = new RepositoryCommitsClient(Substitute.For<IApiConnection>());
+
+                await Assert.ThrowsAsync<ArgumentNullException>(() => client.GetSha1(null, "name", "reference"));
+                await Assert.ThrowsAsync<ArgumentNullException>(() => client.GetSha1("owner", null, "reference"));
+                await Assert.ThrowsAsync<ArgumentNullException>(() => client.GetSha1("owner", "name", null));
+            }
+
+            [Fact]
+            public void GetsCorrectUrl()
+            {
+                var connection = Substitute.For<IApiConnection>();
+                var client = new RepositoryCommitsClient(connection);
+
+                client.GetSha1("owner", "name", "reference");
+
+                connection.Received()
+                    .Get<string>(Arg.Is<Uri>(u => u.ToString() == "repos/owner/name/commits/reference"), null, AcceptHeaders.CommitReferenceSha1Preview);
+            }
+        }
     }
 }

Octokit/Clients/IRepositoryCommitsClient.cs

@@ -50,5 +50,14 @@ public interface IRepositoryCommitsClient
         /// <param name="request">Used to filter list of commits returned</param>
         /// <returns></returns>
         Task<IReadOnlyList<GitHubCommit>> GetAll(string owner, string name, CommitRequest request);
+
+        /// <summary>
+        /// Get the SHA-1 of a commit reference
+        /// </summary>
+        /// <param name="owner">The owner of the repository</param>
+        /// <param name="name">The name of the repository</param>
+        /// <param name="reference">The repository reference</param>
+        /// <returns></returns>
+        Task<string> GetSha1(string owner, string name, string reference);
     }
 }

Octokit/Clients/RepositoryCommitsClient.cs

@@ -79,5 +79,21 @@ public Task<IReadOnlyList<GitHubCommit>> GetAll(string owner, string name, Commi
             return _apiConnection.GetAll<GitHubCommit>(ApiUrls.RepositoryCommits(owner, name),
                 request.ToParametersDictionary());
         }
+
+        /// <summary>
+        /// Get the SHA-1 of a commit reference
+        /// </summary>
+        /// <param name="owner">The owner of the repository</param>
+        /// <param name="name">The name of the repository</param>
+        /// <param name="reference">The repository reference</param>
+        /// <returns></returns>
+        public Task<string> GetSha1(string owner, string name, string reference)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
+            Ensure.ArgumentNotNullOrEmptyString(name, "name");
+            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");
+
+            return _apiConnection.Get<string>(ApiUrls.RepositoryCommit(owner, name, reference), null, AcceptHeaders.CommitReferenceSha1Preview);
+        }
     }
 }

Octokit/Helpers/AcceptHeaders.cs

@@ -13,5 +13,7 @@ public static class AcceptHeaders
         public const string ProtectedBranchesApiPreview = "application/vnd.github.loki-preview+json";
 
         public const string StarCreationTimestamps = "application/vnd.github.v3.star+json";
+
+        public const string CommitReferenceSha1Preview = "application/vnd.github.chitauri-preview+sha";
     }
 }