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# frozen_string_literal: true
module Packages
module Nuget
class ExtractMetadataFileService
ExtractionError = Class.new(StandardError)
MAX_FILE_SIZE = 4.megabytes.freeze
def initialize(package_file)
@package_file = package_file
end
def execute
raise ExtractionError, 'invalid package file' unless valid_package_file?
ServiceResponse.success(payload: nuspec_file_content)
end
private
attr_reader :package_file
def valid_package_file?
package_file &&
package_file.package&.nuget? &&
package_file.file.size > 0 # rubocop:disable Style/ZeroLengthPredicate
end
def nuspec_file_content
with_zip_file do |zip_file|
entry = zip_file.glob('*.nuspec').first
raise ExtractionError, 'nuspec file not found' unless entry
raise ExtractionError, 'nuspec file too big' if MAX_FILE_SIZE < entry.size
Tempfile.open("nuget_extraction_package_file_#{package_file.id}") do |file|
entry.extract(file.path) { true } # allow #extract to overwrite the file
file.unlink
file.read
end
rescue Zip::EntrySizeError => e
raise ExtractionError, "nuspec file has the wrong entry size: #{e.message}"
end
end
def with_zip_file
package_file.file.use_open_file do |open_file|
zip_file = Zip::File.new(open_file, false, true) # rubocop:disable Performance/Rubyzip
yield(zip_file)
end
end
end
end
end
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