debian-mirror-gitlab/app/services/bulk_imports/file_decompression_service.rb
2022-07-16 19:58:13 +02:00

67 lines
1.9 KiB
Ruby

# frozen_string_literal: true
# File Decompression Service allows gzipped files decompression into tmp directory.
#
# @param tmpdir [String] Temp directory to store downloaded file to. Must be located under `Dir.tmpdir`.
# @param filename [String] Name of the file to decompress.
module BulkImports
class FileDecompressionService
include Gitlab::ImportExport::CommandLineUtil
ServiceError = Class.new(StandardError)
def initialize(tmpdir:, filename:)
@tmpdir = tmpdir
@filename = filename
@filepath = File.join(@tmpdir, @filename)
@decompressed_filename = File.basename(@filename, '.gz')
@decompressed_filepath = File.join(@tmpdir, @decompressed_filename)
end
def execute
validate_tmpdir
validate_filepath
validate_decompressed_file_size if Feature.enabled?(:validate_import_decompressed_archive_size)
validate_symlink(filepath)
decompress_file
validate_symlink(decompressed_filepath)
filepath
rescue StandardError => e
File.delete(filepath) if File.exist?(filepath)
File.delete(decompressed_filepath) if File.exist?(decompressed_filepath)
raise e
end
private
attr_reader :tmpdir, :filename, :filepath, :decompressed_filename, :decompressed_filepath
def validate_filepath
Gitlab::Utils.check_path_traversal!(filepath)
end
def validate_tmpdir
Gitlab::Utils.check_allowed_absolute_path!(tmpdir, [Dir.tmpdir])
end
def validate_decompressed_file_size
raise(ServiceError, 'File decompression error') unless size_validator.valid?
end
def validate_symlink(filepath)
raise(ServiceError, 'Invalid file') if File.lstat(filepath).symlink?
end
def decompress_file
gunzip(dir: tmpdir, filename: filename)
end
def size_validator
@size_validator ||= Gitlab::ImportExport::DecompressedArchiveSizeValidator.new(archive_path: filepath)
end
end
end