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# 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.
#
# The `repository` passed to the initializer can be a Repository or
# class that inherits from Repository.
#
# The `repository_type` property will be one of the types named in
# `Gitlab::GlRepository.types`, and is recorded on the `LfsObjectsProject`
# in order to identify the repository location of the blob.
#
# 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, repository, @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, :repository, :repository_type, :branch_name
def initialize(project, repository, branch_name)
@project = project
@repository = repository
@repository_type = repository.repo_type.name
@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 ||= repository.attributes_at(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)
LfsObjectsProject.safe_find_or_create_by!(
project: project,
lfs_object: lfs_object,
repository_type: repository_type
)
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
|
