Merge branch 'sh-fix-utf-8-encoding-resolve-conflicts' into 'master'

Fix UTF-8 conversion issues when resolving conflicts

Closes #63062

See merge request gitlab-org/gitlab-ce!29453

changelogs/unreleased/sh-fix-utf-8-encoding-resolve-conflicts.yml

+---
+title: Fix UTF-8 conversion issues when resolving conflicts
+merge_request: 29453
+author:
+type: fixed

lib/gitlab/gitaly_client/conflicts_service.rb

@@ -65,9 +65,9 @@ module Gitlab
           our_commit_oid: @our_commit_oid,
           target_repository: target_repository.gitaly_repository,
           their_commit_oid: @their_commit_oid,
-          source_branch: source_branch,
-          target_branch: target_branch,
-          commit_message: resolution.commit_message,
+          source_branch: encode_binary(source_branch),
+          target_branch: encode_binary(target_branch),
+          commit_message: encode_binary(resolution.commit_message),
           user: Gitlab::Git::User.from_gitlab(resolution.user).to_gitaly
         )
       end

spec/lib/gitlab/gitaly_client/conflicts_service_spec.rb

@@ -35,7 +35,7 @@ describe Gitlab::GitalyClient::ConflictsService do
     end
     let(:source_branch) { 'master' }
     let(:target_branch) { 'feature' }
-    let(:commit_message) { 'Solving conflicts' }
+    let(:commit_message) { 'Solving conflicts\n\nTést' }
     let(:resolution) do
       Gitlab::Git::Conflict::Resolution.new(user, files, commit_message)
     end
@@ -51,6 +51,25 @@ describe Gitlab::GitalyClient::ConflictsService do
       subject
     end
+    context 'with branches with UTF-8 characters' do
+      let(:source_branch) { 'testòbranch' }
+      let(:target_branch) { 'ábranch' }
+
+      it 'handles commit messages with UTF-8 characters' do
+        allow(::Gitlab::GitalyClient).to receive(:call).and_call_original
+        expect(::Gitlab::GitalyClient).to receive(:call).with(anything, :conflicts_service, :resolve_conflicts, any_args) do |*args|
+          # Force the generation of request messages by iterating through the enumerator
+          message = args[3].to_a.first
+          params = [message.header.commit_message, message.header.source_branch, message.header.target_branch]
+          expect(params.map(&:encoding).uniq).to eq([Encoding::ASCII_8BIT])
+
+          double(resolution_error: nil)
+        end
+
+        subject
+      end
+    end
+
     it 'raises a relevant exception if resolution_error is present' do
       expect_any_instance_of(Gitaly::ConflictsService::Stub).to receive(:resolve_conflicts)
         .with(kind_of(Enumerator), kind_of(Hash)).and_return(double(resolution_error: "something happened"))