1 files changed, 42 insertions, 0 deletions
diff --git a/app/services/lfs/file_modification_handler.rb b/app/services/lfs/file_modification_handler.rb
new file mode 100644
index 00000000000..fe9091a6e5d
--- /dev/null
+++ b/app/services/lfs/file_modification_handler.rb
@@ -0,0 +1,42 @@
+module Lfs
+  class FileModificationHandler
+    attr_reader :project, :branch_name
+
+    delegate :repository, to: :project
+
+    def initialize(project, branch_name)
+      @project = project
+      @branch_name = branch_name
+    end
+
+    def new_file(file_path, file_content)
+      if project.lfs_enabled? && lfs_file?(file_path)
+        lfs_pointer_file = Gitlab::Git::LfsPointerFile.new(file_content)
+        lfs_object = create_lfs_object!(lfs_pointer_file, file_content)
+        content = lfs_pointer_file.pointer
+
+        success = yield(content)
+
+        link_lfs_object!(lfs_object) if success
+      else
+        yield(file_content)
+      end
+    end
+
+    private
+
+    def lfs_file?(file_path)
+      repository.attributes_at(branch_name, file_path)['filter'] == 'lfs'
+    end
+
+    def create_lfs_object!(lfs_pointer_file, file_content)
+      LfsObject.find_or_create_by(oid: lfs_pointer_file.sha256, size: lfs_pointer_file.size) do |lfs_object|
+        lfs_object.file = CarrierWaveStringFile.new(file_content)
+      end
+    end
+
+    def link_lfs_object!(lfs_object)
+      project.lfs_objects << lfs_object
+    end
+  end
+end