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# frozen_string_literal: true
require 'spec_helper'
require 'tempfile'
describe Prawn::Document::Security do
describe 'Password padding' do
include described_class
it 'truncates long passwords' do
pw = 'Long long string' * 30
padded = pad_password(pw)
expect(padded.length).to eq(32)
expect(padded).to eq(pw[0, 32])
end
it 'pads short passwords' do
pw = 'abcd'
padded = pad_password(pw)
expect(padded.length).to eq(32)
expect(padded).to eq(
pw + Prawn::Document::Security::PASSWORD_PADDING[0, 28]
)
end
it 'fullies pad null passwords' do
pw = ''
padded = pad_password(pw)
expect(padded.length).to eq(32)
expect(padded).to eq(Prawn::Document::Security::PASSWORD_PADDING)
end
end
describe 'Setting permissions' do
def doc_with_permissions(permissions)
pdf = Prawn::Document.new
# Make things easier to test
pdf.singleton_class.send :public, :permissions_value
# class << pdf
# public :permissions_value
# end
pdf.encrypt_document(permissions: permissions)
pdf
end
it 'defaults to full permissions' do
expect(doc_with_permissions({}).permissions_value).to eq(0xFFFFFFFF)
expect(doc_with_permissions(
print_document: true,
modify_contents: true,
copy_contents: true,
modify_annotations: true
).permissions_value)
.to eq(0xFFFFFFFF)
end
it 'clears the appropriate bits for each permission flag' do
expect(doc_with_permissions(print_document: false).permissions_value)
.to eq(0b1111_1111_1111_1111_1111_1111_1111_1011)
expect(doc_with_permissions(modify_contents: false).permissions_value)
.to eq(0b1111_1111_1111_1111_1111_1111_1111_0111)
expect(doc_with_permissions(copy_contents: false).permissions_value)
.to eq(0b1111_1111_1111_1111_1111_1111_1110_1111)
expect(doc_with_permissions(modify_annotations: false).permissions_value)
.to eq(0b1111_1111_1111_1111_1111_1111_1101_1111)
end
it 'raise_errors ArgumentError if invalid option is provided' do
expect do
doc_with_permissions(modify_document: false)
end.to raise_error(ArgumentError)
end
end
describe 'Encryption keys' do
# Since PDF::Reader doesn't read encrypted PDF files, we just take the
# roundabout method of verifying each step of the encryption. This works
# fine because the encryption method is deterministic.
let(:pdf) do
Prawn::Document.new do |pdf|
class << pdf
public :owner_password_hash, :user_password_hash, :user_encryption_key
end
pdf.encrypt_document(
user_password: 'foo',
owner_password: 'bar',
permissions: { print_document: false }
)
end
end
it 'calculates the correct owner hash' do
expect(pdf.owner_password_hash.unpack1('H*'))
.to match(/^61CA855012/i)
end
it 'calculates the correct user hash' do
expect(pdf.user_password_hash.unpack1('H*'))
.to match(/^6BC8C51031/i)
end
it 'calculates the correct user_encryption_key' do
expect(pdf.user_encryption_key.unpack1('H*').upcase)
.to eq('B100AB6429')
end
end
describe 'encrypted_pdf_object' do
it 'delegates to PdfObject for simple types' do
expect(PDF::Core.encrypted_pdf_object(true, nil, nil, nil)).to eq('true')
expect(PDF::Core.encrypted_pdf_object(42, nil, nil, nil)).to eq('42')
end
it 'encrypts strings properly' do
expect(PDF::Core.encrypted_pdf_object('foo', '12345', 123, 0))
.to eq('<4ad6e3>')
end
it 'encrypts literal strings properly' do
expect(PDF::Core.encrypted_pdf_object(
PDF::Core::LiteralString.new('foo'), '12345', 123, 0
)).to eq(bin_string("(J\xD6\xE3)"))
expect(PDF::Core.encrypted_pdf_object(
PDF::Core::LiteralString.new('lhfbqg3do5u0satu3fjf'), nil, 123, 0
)).to eq(bin_string(
"(\xF1\x8B\\(\b\xBB\xE18S\x130~4*#\\(%\x87\xE7\x8E\\\n)"
))
end
it 'encrypts time properly' do
expect(PDF::Core.encrypted_pdf_object(
Time.utc(2050, 0o4, 26, 10, 17, 10), '12345', 123, 0
)).to eq(bin_string(
"(h\x83\xBE\xDC\xEC\x99\x0F\xD7\\)%\x13\xD4$\xB8\xF0\x16\xB8\x80\xC5"\
"\xE91+\xCF)"
))
end
it 'properlies handle compound types' do
expect(PDF::Core.encrypted_pdf_object({ Bar: 'foo' }, '12345', 123, 0))
.to eq(
"<< /Bar <4ad6e3>\n>>"
)
expect(PDF::Core.encrypted_pdf_object(%w[foo bar], '12345', 123, 0))
.to eq('[<4ad6e3> <4ed8fe>]')
end
end
describe 'Reference#encrypted_object' do
it 'encrypts references properly' do
ref = PDF::Core::Reference.new(1, ['foo'])
expect(ref.encrypted_object(nil)).to eq("1 0 obj\n[<4fca3f>]\nendobj\n")
end
it 'encrypts references with streams properly' do
ref = PDF::Core::Reference.new(1, {})
ref << 'foo'
result = bin_string(
"1 0 obj\n<< /Length 3\n>>\nstream\nO\xCA?\nendstream\nendobj\n"
)
expect(ref.encrypted_object(nil)).to eq(result)
end
end
describe 'String#encrypted_object' do
it 'encrypts stream properly' do
stream = PDF::Core::Stream.new
stream << 'foo'
result = bin_string("stream\nO\xCA?\nendstream\n")
expect(stream.encrypted_object(nil, 1, 0)).to eq(result)
end
end
end
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