gitlab-org--gitlab-foss/app/services/lfs/file_transformer.rb
2019-05-06 12:51:49 +00:00

77 lines
2.4 KiB
Ruby

# frozen_string_literal: true
module Lfs
# Usage: Calling `new_file` check to see if a file should be in LFS and
# return a transformed result with `content` and `encoding` to commit.
#
# For LFS an LfsObject linked to the project is stored and an LFS
# pointer returned. If the file isn't in LFS the untransformed content
# is returned to save in the commit.
#
# transformer = Lfs::FileTransformer.new(project, @branch_name)
# content_or_lfs_pointer = transformer.new_file(file_path, content).content
# create_transformed_commit(content_or_lfs_pointer)
#
class FileTransformer
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, encoding: nil)
if project.lfs_enabled? && lfs_file?(file_path)
file_content = parse_file_content(file_content, encoding: encoding)
lfs_pointer_file = Gitlab::Git::LfsPointerFile.new(file_content)
lfs_object = create_lfs_object!(lfs_pointer_file, file_content)
link_lfs_object!(lfs_object)
Result.new(content: lfs_pointer_file.pointer, encoding: 'text')
else
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
private
def lfs_file?(file_path)
cached_attributes.attributes(file_path)['filter'] == 'lfs'
end
def cached_attributes
@cached_attributes ||= Gitlab::Git::AttributesAtRefParser.new(repository, branch_name)
end
# rubocop: disable CodeReuse/ActiveRecord
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
# rubocop: enable CodeReuse/ActiveRecord
def link_lfs_object!(lfs_object)
project.lfs_objects << lfs_object
end
def parse_file_content(file_content, encoding: nil)
return file_content.read if file_content.respond_to?(:read)
return Base64.decode64(file_content) if encoding == 'base64'
file_content
end
end
end