feat: implementar un servicio liviano de git-lfs #9361

app/services/lfs_object_service.rb

@@ -0,0 +1,64 @@
+# frozen_string_literal: true
+
+# Representa un objeto git LFS
+class LfsObjectService
+  attr_reader :site, :blob, :usuarie
+
+  # @param :site [Site]
+  # @param :blob [ActiveStorage::Blob]
+  def initialize(site:, blob:, usuarie:)
+    @site = site
+    @blob = blob
+    @usuarie = usuarie
+  end
+
+  def process
+    # Crear el directorio
+    FileUtils.mkdir_p(File.dirname(object_path))
+
+    # Mover el archivo
+    FileUtils.mv(path, object_path) unless File.exist? object_path
+
+    # Crear el pointer
+    Site::Writer.new(site: site, file: path, content: pointer).save
+
+    # Commitear el pointer
+    site.repository.commit(file: path, usuarie: usuarie, message: File.basename(path))
+
+    # Eliminar el pointer
+    FileUtils.rm(path)
+
+    # Hacer link duro del objeto al archivo
+    FileUtils.ln(object_path, path)
+  end
+
+  # @return [String]
+  def path
+    @path ||= blob.service.path_for(blob.key)
+  end
+
+  # @return [String]
+  def digest
+    @digest ||= Digest::SHA256.file(path).hexdigest
+  end
+
+  # @return [String]
+  def object_path
+    @git_lfs_object_path ||= File.join(site.path, '.git', 'lfs', 'objects', digest[0..1], digest[2..3], digest)
+  end
+
+  # @return [Integer]
+  def size
+    @size ||= File.size(File.exist?(object_path) ? object_path : path)
+  end
+
+  # @return [String]
+  def pointer
+    @pointer ||=
+      <<~POINTER
+        version https://git-lfs.github.com/spec/v1
+        oid sha256:#{digest}
+        size #{size}
+      POINTER
+  end
+end