File: cert2text.rb

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#!/usr/bin/env ruby

require 'openssl'

def cert2text(cert_str)
  [
    OpenSSL::X509::Certificate,
    OpenSSL::X509::CRL,
    OpenSSL::X509::Request,
  ].each do |klass|
    begin
      puts klass.new(cert_str).to_text
      return
    rescue
    end
  end
  raise ArgumentError.new('Unknown format.')
end

if ARGV.empty?
  cert2text(STDIN.read)
else
  ARGV.each do |file|
    cert2text(File.read(file))
  end
end