Implement RepositoryExistsException

This exception is thrown when we try to create a repository but it
already exists on the server.

Octokit.Tests.Integration/Clients/RepositoriesClientTests.cs

@@ -5,6 +5,7 @@ using System.Threading.Tasks;
 using Octokit;
 using Octokit.Tests.Integration;
 using Xunit;
+using Octokit.Tests.Helpers;
 
 public class RepositoriesClientTests
 {
@@ -260,6 +261,32 @@ public class RepositoriesClientTests
                 Helper.DeleteRepo(createdRepository);
             }
         }
+
+        [IntegrationTest]
+        public async Task ThrowsRepositoryExistsExceptionForExistingRepository()
+        {
+            var github = new GitHubClient(new ProductHeaderValue("OctokitTests"))
+            {
+                Credentials = Helper.Credentials
+            };
+            var repoName = Helper.MakeNameWithTimestamp("existing-repo");
+            var repository = new NewRepository { Name = repoName };
+            var createdRepository = await github.Repository.Create(repository);
+
+            try
+            {
+                var thrown = await AssertEx.Throws<RepositoryExistsException>(
+                    async () => await github.Repository.Create(repository));
+                Assert.NotNull(thrown);
+                Assert.Equal(repoName, thrown.RepositoryName);
+                Assert.Equal(Helper.Credentials.Login, thrown.Owner);
+                Assert.False(thrown.OwnerIsOrganization);
+            }
+            finally
+            {
+                Helper.DeleteRepo(createdRepository);
+            }
+        }
     }
 
     public class TheCreateMethodForOrganization

Octokit.Tests/Clients/RepositoriesClientTests.cs

@@ -1,8 +1,10 @@
 using System;
 using System.Collections.Generic;
+using System.Net;
 using System.Text;
 using System.Threading.Tasks;
 using NSubstitute;
+using Octokit;
 using Octokit.Tests.Helpers;
 using Xunit;
 
@@ -54,7 +56,32 @@ namespace Octokit.Tests.Clients
 
                 client.Create(newRepository);
 
-                connection.Received().Post<Repository>(Arg.Any<Uri>(), newRepository);
+                connection.Received().Post<Repository>(Args.Uri, newRepository);
+            }
+
+            [Fact]
+            public async Task ThrowsRepositoryExistsExceptionWhenRepositoryExistsForCurrentUser()
+            {
+                var newRepository = new NewRepository { Name = "aName" };
+                var response = Substitute.For<IResponse>();
+                response.StatusCode.Returns((HttpStatusCode)422);
+                response.Body.Returns(@"{""message"":""Validation Failed"",""documentation_url"":"
+                    + @"""http://developer.github.com/v3/repos/#create"",""errors"":[{""resource"":""Repository"","
+                    + @"""code"":""custom"",""field"":""name"",""message"":""name already exists on this account""}]}");
+                var credentials = new Credentials("haacked", "pwd");
+                var connection = Substitute.For<IApiConnection>();
+                connection.Connection.BaseAddress.Returns(GitHubClient.GitHubApiUrl);
+                connection.Connection.Credentials.Returns(credentials);
+                connection.Post<Repository>(Args.Uri, newRepository)
+                    .Returns<Task<Repository>>(_ => { throw new ApiValidationException(response); });
+                var client = new RepositoriesClient(connection);
+
+                var exception = await AssertEx.Throws<RepositoryExistsException>(async () => await client.Create(newRepository));
+
+                Assert.False(exception.OwnerIsOrganization);
+                Assert.Equal("haacked", exception.Owner);
+                Assert.Equal("aName", exception.RepositoryName);
+                Assert.Equal(new Uri("https://github.com/haacked/aName"), exception.ExistingRepositoryWebUrl);
             }
         }
 
@@ -92,7 +119,75 @@ namespace Octokit.Tests.Clients
 
                 await client.Create("aLogin", newRepository);
 
-                connection.Received().Post<Repository>(Arg.Any<Uri>(), newRepository);
+                connection.Received().Post<Repository>(Args.Uri, newRepository);
+            }
+
+            [Fact]
+            public async Task ThrowsRepositoryExistsExceptionWhenRepositoryExistsForSpecifiedOrg()
+            {
+                var newRepository = new NewRepository { Name = "aName" };
+                var response = Substitute.For<IResponse>();
+                response.StatusCode.Returns((HttpStatusCode)422);
+                response.Body.Returns(@"{""message"":""Validation Failed"",""documentation_url"":"
+                    + @"""http://developer.github.com/v3/repos/#create"",""errors"":[{""resource"":""Repository"","
+                    + @"""code"":""custom"",""field"":""name"",""message"":""name already exists on this account""}]}");
+                var connection = Substitute.For<IApiConnection>();
+                connection.Connection.BaseAddress.Returns(GitHubClient.GitHubApiUrl);
+                connection.Post<Repository>(Args.Uri, newRepository)
+                    .Returns<Task<Repository>>(_ => { throw new ApiValidationException(response); });
+                var client = new RepositoriesClient(connection);
+
+                var exception = await AssertEx.Throws<RepositoryExistsException>(
+                    async () => await client.Create("illuminati", newRepository));
+
+                Assert.True(exception.OwnerIsOrganization);
+                Assert.Equal("illuminati", exception.Owner);
+                Assert.Equal("aName", exception.RepositoryName);
+                Assert.Equal(new Uri("https://github.com/illuminati/aName"), exception.ExistingRepositoryWebUrl);
+                Assert.Equal("There is already a repository named 'aName' in the organization 'illuminati'",
+                    exception.Message);
+            }
+
+            [Fact]
+            public async Task ThrowsValidationException()
+            {
+                var newRepository = new NewRepository { Name = "aName" };
+                var response = Substitute.For<IResponse>();
+                response.StatusCode.Returns((HttpStatusCode)422);
+                response.Body.Returns(@"{""message"":""Validation Failed"",""documentation_url"":"
+                    + @"""http://developer.github.com/v3/repos/#create"",""errors"":[]}");
+                var connection = Substitute.For<IApiConnection>();
+                connection.Connection.BaseAddress.Returns(GitHubClient.GitHubApiUrl);
+                connection.Post<Repository>(Args.Uri, newRepository)
+                    .Returns<Task<Repository>>(_ => { throw new ApiValidationException(response); });
+                var client = new RepositoriesClient(connection);
+
+                var exception = await AssertEx.Throws<ApiValidationException>(
+                    async () => await client.Create("illuminati", newRepository));
+
+                Assert.Null(exception as RepositoryExistsException);
+            }
+
+            [Fact]
+            public async Task ThrowsRepositoryExistsExceptionForEnterpriseInstance()
+            {
+                var newRepository = new NewRepository { Name = "aName" };
+                var response = Substitute.For<IResponse>();
+                response.StatusCode.Returns((HttpStatusCode)422);
+                response.Body.Returns(@"{""message"":""Validation Failed"",""documentation_url"":"
+                    + @"""http://developer.github.com/v3/repos/#create"",""errors"":[{""resource"":""Repository"","
+                    + @"""code"":""custom"",""field"":""name"",""message"":""name already exists on this account""}]}");
+                var connection = Substitute.For<IApiConnection>();
+                connection.Connection.BaseAddress.Returns(new Uri("https://example.com"));
+                connection.Post<Repository>(Args.Uri, newRepository)
+                    .Returns<Task<Repository>>(_ => { throw new ApiValidationException(response); });
+                var client = new RepositoriesClient(connection);
+
+                var exception = await AssertEx.Throws<RepositoryExistsException>(
+                    async () => await client.Create("illuminati", newRepository));
+
+                Assert.Equal("aName", exception.RepositoryName);
+                Assert.Equal(new Uri("https://example.com/illuminati/aName"), exception.ExistingRepositoryWebUrl);
             }
         }
 

Octokit/Clients/RepositoriesClient.cs

@@ -42,7 +42,7 @@ namespace Octokit
             if (string.IsNullOrEmpty(newRepository.Name))
                 throw new ArgumentException("The new repository's name must not be null.");
 
-            return ApiConnection.Post<Repository>(ApiUrls.Repositories(), newRepository);
+            return Create(ApiUrls.Repositories(), null, newRepository);
         }
 
         /// <summary>
@@ -62,7 +62,35 @@ namespace Octokit
             if (string.IsNullOrEmpty(newRepository.Name))
                 throw new ArgumentException("The new repository's name must not be null.");
 
-            return ApiConnection.Post<Repository>(ApiUrls.OrganizationRepositories(organizationLogin), newRepository);
+            return Create(ApiUrls.OrganizationRepositories(organizationLogin), organizationLogin, newRepository);
+        }
+
+        async Task<Repository> Create(Uri url, string organizationLogin, NewRepository newRepository)
+        {
+            try
+            {
+                return await ApiConnection.Post<Repository>(url, newRepository);
+            }
+            catch (ApiValidationException e)
+            {
+                if (String.Equals(
+                    "name already exists on this account",
+                    e.ApiError.FirstErrorMessageSafe(),
+                    StringComparison.OrdinalIgnoreCase))
+                {
+                    string owner = organizationLogin ?? Connection.Credentials.Login;
+
+                    var baseAddress = Connection.BaseAddress.Host != GitHubClient.GitHubApiUrl.Host
+                        ? Connection.BaseAddress
+                        : new Uri("https://github.com/");
+                    throw new RepositoryExistsException(
+                        owner,
+                        newRepository.Name,
+                        organizationLogin != null,
+                        baseAddress, e);
+                }
+                throw;
+            }
         }
 
         /// <summary>

Octokit/Exceptions/ApiException.cs

@@ -44,6 +44,13 @@ namespace Octokit
             ApiError = GetApiErrorFromExceptionMessage(response);
         }
 
+        protected ApiException(ApiException innerException)
+        {
+            Ensure.ArgumentNotNull(innerException, "innerException");
+            StatusCode = innerException.StatusCode;
+            ApiError = innerException.ApiError;
+        }
+
         public override string Message
         {
             get { return ApiErrorMessageSafe ?? "An error occurred with this API request"; }

Octokit/Exceptions/ApiValidationException.cs

@@ -33,6 +33,10 @@ namespace Octokit
                 "ApiValidationException created with wrong status code");
         }
 
+        protected ApiValidationException(ApiValidationException innerException) : base(innerException)
+        {
+        }
+
         public override string Message
         {
             get { return ApiErrorMessageSafe ?? "Validation Failed"; }

Octokit/Exceptions/RepositoryExistsException.cs

@@ -0,0 +1,112 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Globalization;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Octokit
+{
+    /// <summary>
+    /// Exception thrown when creating a repository, but it already exists on the server.
+    /// </summary>
+#if !NETFX_CORE
+    [Serializable]
+#endif
+    [SuppressMessage("Microsoft.Design", "CA1032:ImplementStandardExceptionConstructors",
+        Justification = "These exceptions are specific to the GitHub API and not general purpose exceptions")]
+    public class RepositoryExistsException : ApiValidationException
+    {
+        string _message;
+
+        /// <summary>
+        /// Constructs an instance of RepositoryExistsException.
+        /// </summary>
+        /// <param name="owner">The login of the owner of the existing repository</param>
+        /// <param name="name">The name of the existing repository</param>
+        /// <param name="ownerIsOrganization">True if the owner is an organization</param>
+        /// <param name="baseAddress">The base address of the repository.</param>
+        /// <param name="innerException">The inner validation exception.</param>
+        public RepositoryExistsException(
+            string owner,
+            string name,
+            bool ownerIsOrganization,
+            Uri baseAddress,
+            ApiValidationException innerException)
+            : base(innerException)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
+            Ensure.ArgumentNotNullOrEmptyString(name, "repositoryName");
+            Ensure.ArgumentNotNull(baseAddress, "baseAddress");
+
+            Owner = owner;
+            RepositoryName = name;
+            OwnerIsOrganization = ownerIsOrganization;
+            var webBaseAddress = baseAddress.Host != GitHubClient.GitHubApiUrl.Host
+                        ? baseAddress
+                        : GitHubClient.GitHubDotComUrl;
+            ExistingRepositoryWebUrl = new Uri(webBaseAddress, new Uri(owner + "/" + name, UriKind.Relative));
+            string messageFormat = ownerIsOrganization 
+                ? "There is already a repository named '{0}' in the organization '{1}'"
+                : "There is already a repository named '{0}' for the owner '{1}'.";
+
+            _message = String.Format(CultureInfo.InvariantCulture, messageFormat, name, owner);
+        }
+
+        /// <summary>
+        /// The Name of the repository that already exists.
+        /// </summary>
+        public string RepositoryName { get; private set; }
+
+        /// <summary>
+        /// The URL to the existing repository's web page on github.com (or enterprise instance).
+        /// </summary>
+        public Uri ExistingRepositoryWebUrl { get; set; }
+
+        /// <summary>
+        /// A useful default error message.
+        /// </summary>
+        public override string Message
+        {
+            get
+            {
+                return _message;
+            }
+        }
+
+        /// <summary>
+        /// The login of the owner of the repository.
+        /// </summary>
+        public string Owner { get; private set; }
+
+        /// <summary>
+        /// True if the owner is an organization and not the user.
+        /// </summary>
+        public bool OwnerIsOrganization { get; private set; }
+
+#if !NETFX_CORE
+        protected RepositoryExistsException(SerializationInfo info, StreamingContext context)
+            : base(info, context)
+        {
+            if (info == null) return;
+            _message = info.GetString("Message"); 
+            RepositoryName = info.GetString("RepositoryName");
+            Owner = info.GetString("Owner");
+            OwnerIsOrganization = info.GetBoolean("OwnerIsOrganization"); 
+            ExistingRepositoryWebUrl = (Uri)(info.GetValue("ExistingRepositoryWebUrl", typeof(Uri)));
+        }
+
+        public override void GetObjectData(SerializationInfo info, StreamingContext context)
+        {
+            base.GetObjectData(info, context);
+            info.AddValue("Message", Message);
+            info.AddValue("RepositoryName", RepositoryName);
+            info.AddValue("Owner", Owner);
+            info.AddValue("OwnerIsOrganization", OwnerIsOrganization);
+            info.AddValue("ExistingRepositoryWebUrl", ExistingRepositoryWebUrl);
+        }
+#endif
+    }
+}

Octokit/GitHubClient.cs

@@ -10,6 +10,7 @@ namespace Octokit
     public class GitHubClient : IGitHubClient
     {
         public static readonly Uri GitHubApiUrl = new Uri("https://api.github.com/");
+        internal static readonly Uri GitHubDotComUrl = new Uri("https://github.com/");
 
         /// <summary>
         /// Create a new instance of the GitHub API v3 client pointing to 

Octokit/Helpers/ApiErrorExtensions.cs

@@ -0,0 +1,16 @@
+using System.Linq;
+
+namespace Octokit
+{
+    internal static class ApiErrorExtensions
+    {
+        public static string FirstErrorMessageSafe(this ApiError apiError)
+        {
+            if (apiError == null) return null;
+            if (apiError.Errors == null) return null;
+            var firstError = apiError.Errors.FirstOrDefault();
+            if (firstError == null) return null;
+            return firstError.Message;
+        }
+    }
+}

Octokit/Octokit-Mono.csproj

@@ -290,6 +290,8 @@
     <Compile Include="Models\Response\CommitActivity.cs" />
     <Compile Include="Helpers\UnixTimeStampExtensions.cs" />
     <Compile Include="Models\Response\PullRequestCommit.cs" />
+    <Compile Include="Exceptions\RepositoryExistsException.cs" />
+    <Compile Include="Helpers\ApiErrorExtensions.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
 </Project>

Octokit/Octokit-MonoAndroid.csproj

@@ -301,6 +301,8 @@
     <Compile Include="Models\Response\CommitActivity.cs" />
     <Compile Include="Helpers\UnixTimeStampExtensions.cs" />
     <Compile Include="Models\Response\PullRequestCommit.cs" />
+    <Compile Include="Exceptions\RepositoryExistsException.cs" />
+    <Compile Include="Helpers\ApiErrorExtensions.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Novell\Novell.MonoDroid.CSharp.targets" />
 </Project>

Octokit/Octokit-Monotouch.csproj

@@ -296,6 +296,8 @@
     <Compile Include="Models\Response\CommitActivity.cs" />
     <Compile Include="Helpers\UnixTimeStampExtensions.cs" />
     <Compile Include="Models\Response\PullRequestCommit.cs" />
+    <Compile Include="Exceptions\RepositoryExistsException.cs" />
+    <Compile Include="Helpers\ApiErrorExtensions.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
 </Project>

Octokit/Octokit-netcore45.csproj

@@ -288,6 +288,8 @@
     <Compile Include="Models\Response\CommitActivity.cs" />
     <Compile Include="Helpers\UnixTimeStampExtensions.cs" />
     <Compile Include="Models\Response\PullRequestCommit.cs" />
+    <Compile Include="Exceptions\RepositoryExistsException.cs" />
+    <Compile Include="Helpers\ApiErrorExtensions.cs" />
   </ItemGroup>
   <ItemGroup>
     <CodeAnalysisDictionary Include="..\CustomDictionary.xml">

Octokit/Octokit.csproj

@@ -66,6 +66,8 @@
       <Link>Properties\SolutionInfo.cs</Link>
     </Compile>
     <Compile Include="Clients\ActivitiesClient.cs" />
+    <Compile Include="Exceptions\RepositoryExistsException.cs" />
+    <Compile Include="Helpers\ApiErrorExtensions.cs" />
     <Compile Include="Models\Response\DeploymentStatus.cs" />
     <Compile Include="Clients\DeploymentStatusClient.cs" />
     <Compile Include="Clients\IDeploymentStatusClient.cs" />