undefined method `[]=' for nil:NilClass in trailer.rb for PDF#sign

[JasonBarnabe]

require 'origami'
include Origami
input_file = 'test.pdf'
output_file = '/tmp/test_signed.pdf'
private_key = File.read('keys/server.key')
certificate = File.read('keys/server.crt')
passphrase = ''
key = OpenSSL::PKey::RSA.new private_key, passphrase
cert = OpenSSL::X509::Certificate.new(certificate)
pdf = PDF.read(input_file)
pdf.sign(cert, key,
         :method => 'adbe.pkcs7.sha1',
         :location => "Portugal",
         :contact => "myemail@email.tt",
         :reason => "Proof of Concept"
)

test.pdf

jasons-mbp:jason jason$ ruby test.rb 
[info ] ...Reading header...
[info ] ...Parsing revision 1...
[info ] ...Parsing xref table...
[warn ] Unable to parse xref table! Xrefs might be stored into an XRef stream.
[info ] ...Parsing trailer...
[info ] ...Parsing revision 2...
[info ] ...Parsing xref table...
[warn ] Unable to parse xref table! Xrefs might be stored into an XRef stream.
[info ] ...Parsing trailer...
[warn ] Found a XRefStream for this revision at 274 0 R
[warn ] This file has been linearized.
[info ] ...Propagating types...
/Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.2/lib/origami/trailer.rb:143:in `[]=': undefined method `[]=' for nil:NilClass (NoMethodError)
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.2/lib/origami/object.rb:193:in `block in define_field_methods'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.2/lib/origami/pdf.rb:1044:in `block in rebuild_dummy_xrefs'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.2/lib/origami/pdf.rb:1035:in `each'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.2/lib/origami/pdf.rb:1035:in `rebuild_dummy_xrefs'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.2/lib/origami/signature.rb:177:in `sign'
	from test.rb:11:in `<main>'

The error seems to happen because dictionary is nil and nil && Dictionary.new(dictionary) is nil, but I'm not sure if this is only happening because my document is invalid or needs to be preprocessed first...

[JasonBarnabe]

I found that I could read this document with origami by running it through gs -o output.pdf -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress input.pdf first. So not sure if this is a known "limitation" or what, but perhaps this would be a good suggestion for the readme?

[gdelugre]

This problem should now be fixed in 2.0.3.

[JasonBarnabe]

With 2.0.3 the pdf.sign call no longer fails, but if I add pdf.save(output_file) at the end of the script above, I get:

TypeError: no implicit conversion of nil into String
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/filters/predictors.rb:191:in `+'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/filters/predictors.rb:191:in `png_pre_prediction'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/filters/predictors.rb:96:in `apply_pre_prediction'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/filters/predictors.rb:65:in `pre_prediction'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/filters/flate.rb:44:in `encode'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/filters.rb:353:in `encode'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/stream.rb:481:in `encode_data'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/stream.rb:379:in `block in encode!'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/stream.rb:367:in `downto'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/stream.rb:367:in `encode!'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/stream.rb:289:in `encoded_data'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/stream.rb:392:in `to_s'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/pdf.rb:929:in `block (2 levels) in output'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/pdf.rb:854:in `each'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/pdf.rb:854:in `block in output'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/pdf.rb:819:in `each'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/pdf.rb:819:in `output'
	from /Users/jason/.rvm/gems/ruby-2.3.3/gems/origami-2.0.3/lib/origami/pdf.rb:223:in `save'
	from (irb):17
	from /Users/jason/.rvm/rubies/ruby-2.3.3/bin/irb:11:in `<main>'

[zymtx5g79k]

2.1.0 Not resolved. But it works when lazy: true

Origami::PDF.read INPUTFILE, lazy: true