pdfdecrypt

#!/usr/bin/env ruby

=begin

= Info
    Decrypts a PDF document.

= License
    Copyright (C) 2016  Guillaume Delugré.

    Origami is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Origami is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with Origami.  If not, see <http://www.gnu.org/licenses/>.

=end

begin
    require 'origami'
rescue LoadError
    $: << File.join(__dir__, '../lib')
    require 'origami'
end
include Origami

require 'optparse'

class OptParser
    BANNER = <<USAGE
Usage: #{$0} [<PDF-file>] [-p <password>] [-o <output-file>]
Decrypts a PDF document. Supports RC4 40 to 128 bits, AES128, AES256.
Bug reports or feature requests at: http://github.com/gdelugre/origami

Options:
USAGE

    def self.parser(options)
        OptionParser.new do |opts|
            opts.banner = BANNER

            opts.on("-o", "--output FILE", "Output PDF file (stdout by default)") do |o|
                options[:output] = o
            end

            opts.on("-p", "--password PASSWORD", "Password of the document") do |p|
                options[:password] = p
            end

            opts.on_tail("-h", "--help", "Show this message") do
                puts opts
                exit
            end
        end
    end

    def self.parse(args)
        options =
        {
          output: STDOUT,
          password: ''
        }

        self.parser(options).parse!(args)

        options
    end
end

begin
    @options = OptParser.parse(ARGV)

    target = (ARGV.empty?) ? STDIN : ARGV.shift
    params =
    {
        verbosity: Parser::VERBOSE_QUIET,
        password: @options[:password]
    }

    PDF.read(target, params).save(@options[:output], decrypt: true, noindent: true)

rescue
    abort "#{$!.class}: #{$!.message}"
end