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# frozen_string_literal: true
module Gitlab
module Ci
class DecompressedGzipSizeValidator
DEFAULT_MAX_BYTES = 4.gigabytes.freeze
TIMEOUT_LIMIT = 210.seconds
ServiceError = Class.new(StandardError)
def initialize(archive_path:, max_bytes: DEFAULT_MAX_BYTES)
@archive_path = archive_path
@max_bytes = max_bytes
end
def valid?
validate
end
private
def validate
pgrps = nil
valid_archive = true
validate_archive_path
Timeout.timeout(TIMEOUT_LIMIT) do
stderr_r, stderr_w = IO.pipe
stdout, wait_threads = Open3.pipeline_r(*command, pgroup: true, err: stderr_w)
# When validation is performed on a small archive (e.g. 100 bytes)
# `wait_thr` finishes before we can get process group id. Do not
# raise exception in this scenario.
pgrps = wait_threads.map do |wait_thr|
Process.getpgid(wait_thr[:pid])
rescue Errno::ESRCH
nil
end
pgrps.compact!
status = wait_threads.last.value
if status.success?
result = stdout.readline
valid_archive = false if result.to_i > max_bytes
else
valid_archive = false
end
ensure
stdout.close
stderr_w.close
stderr_r.close
end
valid_archive
rescue StandardError
pgrps.each { |pgrp| Process.kill(-1, pgrp) } if pgrps
false
end
def validate_archive_path
Gitlab::Utils.check_path_traversal!(archive_path)
raise(ServiceError, 'Archive path is a symlink') if File.lstat(archive_path).symlink?
raise(ServiceError, 'Archive path is not a file') unless File.file?(archive_path)
end
def command
[['gzip', '-dc', archive_path], ['wc', '-c']]
end
attr_reader :archive_path, :max_bytes
end
end
end
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