Use correct encoding with Lfs::FileTransfromer

app/services/files/multi_service.rb

@@ -15,8 +15,9 @@ module Files
     def actions_after_lfs_transformation(transformer, actions)
       actions.map do |action|
         if action[:action] == 'create'
-          content = transformer.new_file(action[:file_path], action[:content])
-          action[:content] = content
+          result = transformer.new_file(action[:file_path], action[:content], encoding: action[:encoding])
+          action[:content] = result.content
+          action[:encoding] = result.encoding
         end
 
         action

app/services/lfs/file_transformer.rb

@@ -20,16 +20,26 @@ module Lfs
       @branch_name = branch_name
     end
 
-    def new_file(file_path, file_content)
+    def new_file(file_path, file_content, encoding: nil)
       if project.lfs_enabled? && lfs_file?(file_path)
+        file_content = Base64.decode64(file_content) if encoding == 'base64'
         lfs_pointer_file = Gitlab::Git::LfsPointerFile.new(file_content)
         lfs_object = create_lfs_object!(lfs_pointer_file, file_content)
 
         link_lfs_object!(lfs_object)
 
-        lfs_pointer_file.pointer
+        Result.new(content: lfs_pointer_file.pointer, encoding: 'text')
       else
-        file_content
+        Result.new(content: file_content, encoding: encoding)
+      end
+    end
+
+    class Result
+      attr_reader :content, :encoding
+
+      def initialize(content:, encoding:)
+        @content = content
+        @encoding = encoding
       end
     end
 

spec/services/files/multi_service_spec.rb

@@ -16,18 +16,18 @@ describe Files::MultiService do
     Gitlab::Git::Commit.last_for_path(project.repository, branch_name, original_file_path).sha
   end
 
-  let(:actions) do
-    [
-      {
-        action: action,
-        file_path: new_file_path,
-        previous_path: original_file_path,
-        content: file_content,
-        last_commit_id: original_commit_id
-      }
-    ]
+  let(:default_action) do
+    {
+      action: action,
+      file_path: new_file_path,
+      previous_path: original_file_path,
+      content: file_content,
+      last_commit_id: original_commit_id
+    }
   end
 
+  let(:actions) { [default_action] }
+
   let(:commit_params) do
     {
       commit_message: "Update File",
@@ -135,6 +135,26 @@ describe Files::MultiService do
         expect(LfsObject.last.file.read).to eq file_content
       end
 
+      context 'with base64 encoded content' do
+        let(:raw_file_content) { 'Raw content' }
+        let(:file_content) { Base64.encode64(raw_file_content) }
+        let(:actions) { [default_action.merge(encoding: 'base64')] }
+
+        it 'creates an LFS pointer' do
+          subject.execute
+
+          blob = repository.blob_at('lfs', new_file_path)
+
+          expect(blob.data).to start_with('version https://git-lfs.github.com/spec/v1')
+        end
+
+        it "creates an LfsObject with the file's content" do
+          subject.execute
+
+          expect(LfsObject.last.file.read).to eq raw_file_content
+        end
+      end
+
       it 'links the LfsObject to the project' do
         expect do
           subject.execute

spec/services/lfs/file_transformer_spec.rb

@@ -16,6 +16,18 @@ describe Lfs::FileTransformer do
 
         subject.new_file(file_path, file_content)
       end
+
+      it 'returns untransformed content' do
+        result = subject.new_file(file_path, file_content)
+
+        expect(result.content).to eq(file_content)
+      end
+
+      it 'returns untransformed encoding' do
+        result = subject.new_file(file_path, file_content, encoding: 'base64')
+
+        expect(result.encoding).to eq('base64')
+      end
     end
 
     context 'with lfs enabled' do
@@ -38,17 +50,23 @@ describe Lfs::FileTransformer do
         expect(LfsObject.last.file.read).to eq file_content
       end
 
-      it 'creates an LFS pointer' do
-        new_content = subject.new_file(file_path, file_content)
+      it 'returns an LFS pointer' do
+        result = subject.new_file(file_path, file_content)
 
-        expect(new_content).to start_with('version https://git-lfs.github.com/spec/v1')
+        expect(result.content).to start_with('version https://git-lfs.github.com/spec/v1')
+      end
+
+      it 'returns LFS pointer encoding as text' do
+        result = subject.new_file(file_path, file_content, encoding: 'base64')
+
+        expect(result.encoding).to eq('text')
       end
 
       context "when doesn't use LFS" do
         let(:file_path) { 'other.filetype' }
 
         it "doesn't create LFS pointers" do
-          new_content = subject.new_file(file_path, file_content)
+          new_content = subject.new_file(file_path, file_content).content
 
           expect(new_content).not_to start_with('version https://git-lfs.github.com/spec/v1')
           expect(new_content).to eq(file_content)