Remove unused ExtractCommitSignature RPC

This RPC was introduced in 0.70.0, but gone unused in favour of the
GetCommitSignatures RPC. Given there's no active callsight, it's being
removed in GitLab-Rails too: https://gitlab.com/gitlab-org/gitlab/merge_requests/18804

Closes: https://gitlab.com/gitlab-org/gitlab/issues/31079

6 files changed, 130 insertions, 461 deletions

diff --git a/internal/service/commit/extractsignature.go b/internal/service/commit/extractsignature.go
deleted file mode 100644
index 8cf7d6e02..000000000
--- a/internal/service/commit/extractsignature.go
+++ /dev/null
@@ -1,35 +0,0 @@
-package commit
-
-import (
-	"gitlab.com/gitlab-org/gitaly/internal/rubyserver"
-	"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
-)
-
-func (s *server) ExtractCommitSignature(request *gitalypb.ExtractCommitSignatureRequest, stream gitalypb.CommitService_ExtractCommitSignatureServer) error {
-	ctx := stream.Context()
-
-	client, err := s.ruby.CommitServiceClient(ctx)
-	if err != nil {
-		return err
-	}
-
-	clientCtx, err := rubyserver.SetHeaders(ctx, request.GetRepository())
-	if err != nil {
-		return err
-	}
-
-	rubyStream, err := client.ExtractCommitSignature(clientCtx, request)
-	if err != nil {
-		return err
-	}
-
-	return rubyserver.Proxy(func() error {
-		resp, err := rubyStream.Recv()
-		if err != nil {
-			md := rubyStream.Trailer()
-			stream.SetTrailer(md)
-			return err
-		}
-		return stream.Send(resp)
-	})
-}
diff --git a/internal/service/commit/extractsignature_test.go b/internal/service/commit/extractsignature_test.go
deleted file mode 100644
index 76d90940c..000000000
--- a/internal/service/commit/extractsignature_test.go
+++ /dev/null
@@ -1,165 +0,0 @@
-package commit
-
-import (
-	"context"
-	"io"
-	"io/ioutil"
-	"testing"
-
-	"github.com/stretchr/testify/require"
-	"gitlab.com/gitlab-org/gitaly/internal/testhelper"
-	"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
-	"google.golang.org/grpc/codes"
-)
-
-func TestExtractCommitSignatureSuccess(t *testing.T) {
-	exampleSignature, err := ioutil.ReadFile("testdata/commit-5937ac0a7beb003549fc5fd26fc247adbce4a52e-signature")
-	require.NoError(t, err)
-
-	exampleSignedText, err := ioutil.ReadFile("testdata/commit-5937ac0a7beb003549fc5fd26fc247adbce4a52e-signed-text")
-	require.NoError(t, err)
-
-	ctx, cancel := testhelper.Context()
-	defer cancel()
-
-	server, serverSocketPath := startTestServices(t)
-	defer server.Stop()
-
-	client, conn := newCommitServiceClient(t, serverSocketPath)
-	defer conn.Close()
-
-	testRepo, _, cleanupFn := testhelper.NewTestRepo(t)
-	defer cleanupFn()
-
-	testCases := []struct {
-		desc       string
-		req        *gitalypb.ExtractCommitSignatureRequest
-		signature  []byte
-		signedText []byte
-	}{
-		{
-			desc: "commit with signature",
-			req: &gitalypb.ExtractCommitSignatureRequest{
-				Repository: testRepo,
-				CommitId:   "5937ac0a7beb003549fc5fd26fc247adbce4a52e",
-			},
-			signature:  exampleSignature,
-			signedText: exampleSignedText,
-		},
-		{
-			desc: "commit without signature",
-			req: &gitalypb.ExtractCommitSignatureRequest{
-				Repository: testRepo,
-				CommitId:   "e63f41fe459e62e1228fcef60d7189127aeba95a",
-			},
-			signature:  nil,
-			signedText: nil,
-		},
-	}
-
-	for _, tc := range testCases {
-		t.Run(tc.desc, func(t *testing.T) {
-			signature, signedText, err := getSignatureAndText(ctx, client, tc.req)
-			require.NoError(t, err)
-
-			require.Equal(t, string(tc.signature), string(signature))
-			require.Equal(t, string(tc.signedText), string(signedText))
-		})
-	}
-}
-
-func getSignatureAndText(ctx context.Context, client gitalypb.CommitServiceClient, req *gitalypb.ExtractCommitSignatureRequest) ([]byte, []byte, error) {
-	stream, err := client.ExtractCommitSignature(ctx, req)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	var signature, signedText []byte
-	var resp *gitalypb.ExtractCommitSignatureResponse
-	for err == nil {
-		resp, err = stream.Recv()
-		if err != nil && err != io.EOF {
-			return nil, nil, err
-		}
-
-		signature = append(signature, resp.GetSignature()...)
-		signedText = append(signedText, resp.GetSignedText()...)
-	}
-
-	return signature, signedText, nil
-}
-
-func TestExtractCommitSignatureFail(t *testing.T) {
-	ctx, cancel := testhelper.Context()
-	defer cancel()
-
-	server, serverSocketPath := startTestServices(t)
-	defer server.Stop()
-
-	client, conn := newCommitServiceClient(t, serverSocketPath)
-	defer conn.Close()
-
-	testRepo, _, cleanupFn := testhelper.NewTestRepo(t)
-	defer cleanupFn()
-
-	testCases := []struct {
-		desc string
-		req  *gitalypb.ExtractCommitSignatureRequest
-		code codes.Code
-	}{
-		{
-			desc: "truncated commit ID",
-			req: &gitalypb.ExtractCommitSignatureRequest{
-				Repository: testRepo,
-				CommitId:   "5937ac0a7beb003549fc5fd26",
-			},
-			code: codes.InvalidArgument,
-		},
-		{
-			desc: "empty commit ID",
-			req: &gitalypb.ExtractCommitSignatureRequest{
-				Repository: testRepo,
-				CommitId:   "",
-			},
-			code: codes.InvalidArgument,
-		},
-		{
-			desc: "empty repo field",
-			req: &gitalypb.ExtractCommitSignatureRequest{
-				Repository: nil,
-				CommitId:   "e63f41fe459e62e1228fcef60d7189127aeba95a",
-			},
-			code: codes.InvalidArgument,
-		},
-		{
-			desc: "commit ID unknown",
-			req: &gitalypb.ExtractCommitSignatureRequest{
-				Repository: testRepo,
-				CommitId:   "0000000000000000000000000000000000000000",
-			},
-			code: codes.OK,
-		},
-	}
-
-	for _, tc := range testCases {
-		t.Run(tc.desc, func(t *testing.T) {
-			stream, err := client.ExtractCommitSignature(ctx, tc.req)
-			require.NoError(t, err)
-
-			var resp *gitalypb.ExtractCommitSignatureResponse
-			for err == nil {
-				resp, err = stream.Recv()
-				if resp != nil {
-					require.Empty(t, resp.Signature, "signature must be empty")
-					require.Empty(t, resp.SignedText, "signed text must be empty")
-				}
-			}
-
-			if tc.code == codes.OK {
-				require.Equal(t, io.EOF, err, "expect EOF when there is no error")
-			} else {
-				testhelper.RequireGrpcError(t, err, tc.code)
-			}
-		})
-	}
-}
diff --git a/proto/commit.proto b/proto/commit.proto
index 8eca1dd75..2f33b325f 100644
--- a/proto/commit.proto
+++ b/proto/commit.proto
@@ -123,16 +123,6 @@ service CommitService {
       target_repository_field: "1"
     };
   }
-
-  // ExtractCommitSignature returns a stream because the signed text may be
-  // arbitrarily large and signature verification is impossible without the
-  // full text.
-  rpc ExtractCommitSignature(ExtractCommitSignatureRequest) returns (stream ExtractCommitSignatureResponse) {
-    option (op_type) = {
-      op: ACCESSOR
-      target_repository_field: "1"
-    };
-  }
   rpc GetCommitSignatures(GetCommitSignaturesRequest) returns (stream GetCommitSignaturesResponse) {
     option (op_type) = {
       op: ACCESSOR
diff --git a/proto/go/gitalypb/commit.pb.go b/proto/go/gitalypb/commit.pb.go
index c83afcbf6..22f4626b2 100644
--- a/proto/go/gitalypb/commit.pb.go
+++ b/proto/go/gitalypb/commit.pb.go
@@ -2675,135 +2675,134 @@ func init() {
 func init() { proto.RegisterFile("commit.proto", fileDescriptor_db7163399a465f48) }
 
 var fileDescriptor_db7163399a465f48 = []byte{
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+	0xff, 0xff, 0x40, 0xb0, 0x08, 0x31, 0xa6, 0x1e, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -2838,10 +2837,6 @@ type CommitServiceClient interface {
 	ListCommitsByOid(ctx context.Context, in *ListCommitsByOidRequest, opts ...grpc.CallOption) (CommitService_ListCommitsByOidClient, error)
 	ListCommitsByRefName(ctx context.Context, in *ListCommitsByRefNameRequest, opts ...grpc.CallOption) (CommitService_ListCommitsByRefNameClient, error)
 	FilterShasWithSignatures(ctx context.Context, opts ...grpc.CallOption) (CommitService_FilterShasWithSignaturesClient, error)
-	// ExtractCommitSignature returns a stream because the signed text may be
-	// arbitrarily large and signature verification is impossible without the
-	// full text.
-	ExtractCommitSignature(ctx context.Context, in *ExtractCommitSignatureRequest, opts ...grpc.CallOption) (CommitService_ExtractCommitSignatureClient, error)
 	GetCommitSignatures(ctx context.Context, in *GetCommitSignaturesRequest, opts ...grpc.CallOption) (CommitService_GetCommitSignaturesClient, error)
 	GetCommitMessages(ctx context.Context, in *GetCommitMessagesRequest, opts ...grpc.CallOption) (CommitService_GetCommitMessagesClient, error)
 }
@@ -3300,40 +3295,8 @@ func (x *commitServiceFilterShasWithSignaturesClient) Recv() (*FilterShasWithSig
 	return m, nil
 }
 
-func (c *commitServiceClient) ExtractCommitSignature(ctx context.Context, in *ExtractCommitSignatureRequest, opts ...grpc.CallOption) (CommitService_ExtractCommitSignatureClient, error) {
-	stream, err := c.cc.NewStream(ctx, &_CommitService_serviceDesc.Streams[12], "/gitaly.CommitService/ExtractCommitSignature", opts...)
-	if err != nil {
-		return nil, err
-	}
-	x := &commitServiceExtractCommitSignatureClient{stream}
-	if err := x.ClientStream.SendMsg(in); err != nil {
-		return nil, err
-	}
-	if err := x.ClientStream.CloseSend(); err != nil {
-		return nil, err
-	}
-	return x, nil
-}
-
-type CommitService_ExtractCommitSignatureClient interface {
-	Recv() (*ExtractCommitSignatureResponse, error)
-	grpc.ClientStream
-}
-
-type commitServiceExtractCommitSignatureClient struct {
-	grpc.ClientStream
-}
-
-func (x *commitServiceExtractCommitSignatureClient) Recv() (*ExtractCommitSignatureResponse, error) {
-	m := new(ExtractCommitSignatureResponse)
-	if err := x.ClientStream.RecvMsg(m); err != nil {
-		return nil, err
-	}
-	return m, nil
-}
-
 func (c *commitServiceClient) GetCommitSignatures(ctx context.Context, in *GetCommitSignaturesRequest, opts ...grpc.CallOption) (CommitService_GetCommitSignaturesClient, error) {
-	stream, err := c.cc.NewStream(ctx, &_CommitService_serviceDesc.Streams[13], "/gitaly.CommitService/GetCommitSignatures", opts...)
+	stream, err := c.cc.NewStream(ctx, &_CommitService_serviceDesc.Streams[12], "/gitaly.CommitService/GetCommitSignatures", opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -3365,7 +3328,7 @@ func (x *commitServiceGetCommitSignaturesClient) Recv() (*GetCommitSignaturesRes
 }
 
 func (c *commitServiceClient) GetCommitMessages(ctx context.Context, in *GetCommitMessagesRequest, opts ...grpc.CallOption) (CommitService_GetCommitMessagesClient, error) {
-	stream, err := c.cc.NewStream(ctx, &_CommitService_serviceDesc.Streams[14], "/gitaly.CommitService/GetCommitMessages", opts...)
+	stream, err := c.cc.NewStream(ctx, &_CommitService_serviceDesc.Streams[13], "/gitaly.CommitService/GetCommitMessages", opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -3418,10 +3381,6 @@ type CommitServiceServer interface {
 	ListCommitsByOid(*ListCommitsByOidRequest, CommitService_ListCommitsByOidServer) error
 	ListCommitsByRefName(*ListCommitsByRefNameRequest, CommitService_ListCommitsByRefNameServer) error
 	FilterShasWithSignatures(CommitService_FilterShasWithSignaturesServer) error
-	// ExtractCommitSignature returns a stream because the signed text may be
-	// arbitrarily large and signature verification is impossible without the
-	// full text.
-	ExtractCommitSignature(*ExtractCommitSignatureRequest, CommitService_ExtractCommitSignatureServer) error
 	GetCommitSignatures(*GetCommitSignaturesRequest, CommitService_GetCommitSignaturesServer) error
 	GetCommitMessages(*GetCommitMessagesRequest, CommitService_GetCommitMessagesServer) error
 }
@@ -3487,9 +3446,6 @@ func (*UnimplementedCommitServiceServer) ListCommitsByRefName(req *ListCommitsBy
 func (*UnimplementedCommitServiceServer) FilterShasWithSignatures(srv CommitService_FilterShasWithSignaturesServer) error {
 	return status.Errorf(codes.Unimplemented, "method FilterShasWithSignatures not implemented")
 }
-func (*UnimplementedCommitServiceServer) ExtractCommitSignature(req *ExtractCommitSignatureRequest, srv CommitService_ExtractCommitSignatureServer) error {
-	return status.Errorf(codes.Unimplemented, "method ExtractCommitSignature not implemented")
-}
 func (*UnimplementedCommitServiceServer) GetCommitSignatures(req *GetCommitSignaturesRequest, srv CommitService_GetCommitSignaturesServer) error {
 	return status.Errorf(codes.Unimplemented, "method GetCommitSignatures not implemented")
 }
@@ -3884,27 +3840,6 @@ func (x *commitServiceFilterShasWithSignaturesServer) Recv() (*FilterShasWithSig
 	return m, nil
 }
 
-func _CommitService_ExtractCommitSignature_Handler(srv interface{}, stream grpc.ServerStream) error {
-	m := new(ExtractCommitSignatureRequest)
-	if err := stream.RecvMsg(m); err != nil {
-		return err
-	}
-	return srv.(CommitServiceServer).ExtractCommitSignature(m, &commitServiceExtractCommitSignatureServer{stream})
-}
-
-type CommitService_ExtractCommitSignatureServer interface {
-	Send(*ExtractCommitSignatureResponse) error
-	grpc.ServerStream
-}
-
-type commitServiceExtractCommitSignatureServer struct {
-	grpc.ServerStream
-}
-
-func (x *commitServiceExtractCommitSignatureServer) Send(m *ExtractCommitSignatureResponse) error {
-	return x.ServerStream.SendMsg(m)
-}
-
 func _CommitService_GetCommitSignatures_Handler(srv interface{}, stream grpc.ServerStream) error {
 	m := new(GetCommitSignaturesRequest)
 	if err := stream.RecvMsg(m); err != nil {
@@ -4043,11 +3978,6 @@ var _CommitService_serviceDesc = grpc.ServiceDesc{
 			ClientStreams: true,
 		},
 		{
-			StreamName:    "ExtractCommitSignature",
-			Handler:       _CommitService_ExtractCommitSignature_Handler,
-			ServerStreams: true,
-		},
-		{
 			StreamName:    "GetCommitSignatures",
 			Handler:       _CommitService_GetCommitSignatures_Handler,
 			ServerStreams: true,
diff --git a/ruby/lib/gitaly_server/commit_service.rb b/ruby/lib/gitaly_server/commit_service.rb
index efd89124c..6f37e1ffb 100644
--- a/ruby/lib/gitaly_server/commit_service.rb
+++ b/ruby/lib/gitaly_server/commit_service.rb
@@ -1,8 +1,5 @@
 module GitalyServer
   class CommitService < Gitaly::CommitService::Service
-    include Utils
-    include Gitlab::EncodingHelper
-
     def filter_shas_with_signatures(_session, call)
       Enumerator.new do |y|
         repository = nil
@@ -14,49 +11,5 @@ module GitalyServer
         end
       end
     end
-
-    def extract_commit_signature(request, call)
-      repository = Gitlab::Git::Repository.from_gitaly(request.repository, call)
-
-      Enumerator.new do |y|
-        each_commit_signature_chunk(repository, request.commit_id) do |signature_chunk, signed_text_chunk|
-          y.yield Gitaly::ExtractCommitSignatureResponse.new(signature: signature_chunk) if signature_chunk.present?
-
-          y.yield Gitaly::ExtractCommitSignatureResponse.new(signed_text: signed_text_chunk) if signed_text_chunk.present?
-        end
-      end
-    end
-
-    private
-
-    # yields either signature chunks or signed_text chunks to the passed block
-    def each_commit_signature_chunk(repository, commit_id)
-      raise ArgumentError.new("expected a block") unless block_given?
-
-      begin
-        signature_text, signed_text = Rugged::Commit.extract_signature(repository.rugged, commit_id)
-      rescue Rugged::InvalidError
-        raise GRPC::InvalidArgument.new("commit lookup failed for #{commit_id.inspect}")
-      rescue Rugged::OdbError
-        # The client does not care if the commit does not exist
-        return
-      end
-
-      signature_text_io = binary_stringio(signature_text)
-      loop do
-        chunk = signature_text_io.read(Gitlab.config.git.write_buffer_size)
-        break if chunk.nil?
-
-        yield chunk, nil
-      end
-
-      signed_text_io = binary_stringio(signed_text)
-      loop do
-        chunk = signed_text_io.read(Gitlab.config.git.write_buffer_size)
-        break if chunk.nil?
-
-        yield nil, chunk
-      end
-    end
   end
 end
diff --git a/ruby/proto/gitaly/commit_services_pb.rb b/ruby/proto/gitaly/commit_services_pb.rb
index a2ece6609..f6dd140b7 100644
--- a/ruby/proto/gitaly/commit_services_pb.rb
+++ b/ruby/proto/gitaly/commit_services_pb.rb
@@ -34,10 +34,6 @@ module Gitaly
       rpc :ListCommitsByOid, ListCommitsByOidRequest, stream(ListCommitsByOidResponse)
       rpc :ListCommitsByRefName, ListCommitsByRefNameRequest, stream(ListCommitsByRefNameResponse)
       rpc :FilterShasWithSignatures, stream(FilterShasWithSignaturesRequest), stream(FilterShasWithSignaturesResponse)
-      # ExtractCommitSignature returns a stream because the signed text may be
-      # arbitrarily large and signature verification is impossible without the
-      # full text.
-      rpc :ExtractCommitSignature, ExtractCommitSignatureRequest, stream(ExtractCommitSignatureResponse)
       rpc :GetCommitSignatures, GetCommitSignaturesRequest, stream(GetCommitSignaturesResponse)
       rpc :GetCommitMessages, GetCommitMessagesRequest, stream(GetCommitMessagesResponse)
     end