class Stripe::StripeClient::SystemProfiler

def self.uname
  if ::File.exist?("/proc/version")
    ::File.read("/proc/version").strip
  else
    case RbConfig::CONFIG["host_os"]
    when /linux|darwin|bsd|sunos|solaris|cygwin/i
      uname_from_system
    when /mswin|mingw/i
      uname_from_system_ver
    else
      "unknown platform"
    end
  end
end

def self.uname_from_system
  (`uname -a 2>/dev/null` || "").strip
rescue Errno::ENOENT
  "uname executable not found"
rescue Errno::ENOMEM # couldn't create subprocess
  "uname lookup failed"
end

def self.uname_from_system_ver
  (`ver` || "").strip
rescue Errno::ENOENT
  "ver executable not found"
rescue Errno::ENOMEM # couldn't create subprocess
  "uname lookup failed"
end

def initialize
  @uname = self.class.uname
end

def user_agent
  lang_version = "#{RUBY_VERSION} p#{RUBY_PATCHLEVEL} " \
                 "(#{RUBY_RELEASE_DATE})"
  {
    application: Stripe.app_info,
    bindings_version: Stripe::VERSION,
    lang: "ruby",
    lang_version: lang_version,
    platform: RUBY_PLATFORM,
    engine: defined?(RUBY_ENGINE) ? RUBY_ENGINE : "",
    publisher: "stripe",
    uname: @uname,
    hostname: Socket.gethostname,
  }.delete_if { |_k, v| v.nil? }
end