From: gfotos@...
Date: 2015-04-02T07:31:26+00:00
Subject: [ruby-core:68722] [Ruby trunk - Bug #8612] nil in	ERB::Util.url_encode

Issue #8612 has been updated by Fotos Georgiadis.


Islam Azab wrote:
> Is this fixed in Ruby 2.0.0 ruby 2.0.0p451 (2014-02-24 revision 45167)?

As you can see it was never backported to either [1.9.3](https://github.com/ruby/ruby/blob/ruby_1_9_3/lib/cgi/util.rb#L8) nor [2.0.0](https://github.com/ruby/ruby/blob/ruby_2_0_0/lib/cgi/util.rb#L9).  The fix is part of Ruby [2.1](https://github.com/ruby/ruby/blob/ruby_2_1/lib/cgi/util.rb#L10).
 
> I am still getting the same error that is mentioned in this issue.

There is a workaround (which I briefly describe above) but I don't really remember how it works. Should have documented this better. :)

Good luck.

----------------------------------------
Bug #8612: nil in ERB::Util.url_encode
https://bugs.ruby-lang.org/issues/8612#change-52006

* Author: Fotos Georgiadis
* Status: Rejected
* Priority: Normal
* Assignee: Takeyuki FUJIOKA
* ruby -v: 1.9.3p448, 2.0.0p255
* Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN
----------------------------------------
=begin
We hit a bug while using Rails and trying to URL encode an ActiveSupport::SafeBuffer. I have managed to reproduce it using a small test case for Ruby 1.9.3 and Ruby 2.0.0 (both attached) that shows a minimum set of requirements to trigger the bug. The issue seems to be fixed in trunk (2.1) but I couldn't find the relevant commit(s).

To reproduce:
  require 'erb'

  class MyString < String
    def to_s
      self
    end

    def gsub(*args, &block)
      to_str.gsub(*args, &block)
    end
  end

  string = "\xCE\x94\xCE\xBF\xCE\xBA\xCE\xB9\xCE\xBC\xCE\xAE".force_encoding("UTF-8")

  ERB::Util.u(MyString.new(string))

Expected outcome:

The URL encoding should work and it should encode the characters properly (according to the spec).

Actual outcome:

  NoMethodError: undefined method `unpack' for nil:NilClass
    /Users/fotos/Playground/OpenSource/ruby/lib/erb.rb:952:in `block in url_encode'
    /Users/fotos/Playground/OpenSource/ruby/test/erb/test_erb.rb:71:in `gsub'
    /Users/fotos/Playground/OpenSource/ruby/test/erb/test_erb.rb:71:in `gsub'
    /Users/fotos/Playground/OpenSource/ruby/lib/erb.rb:951:in `url_encode'
    /Users/fotos/Playground/OpenSource/ruby/test/erb/test_erb.rb:491:in `test_url_encode_string_subclass'

Using

Workaround:

Yielding the match and using it instead of $& (last match) seems to work properly as demonstrated in the patch.

Thanks

PS. Some credits go out to Aggelos Orfanakos (@agorf) for triggering the bug! :-)
=end

---Files--------------------------------
ruby_1_9_3_url_encode_issue.patch (1.49 KB)
ruby_2_0_0_url_encode_issue.patch (1.49 KB)
ruby_1_9_3_cgi_escape_issue.patch (1.03 KB)
ruby_2_0_0_cgi_escape_issue.patch (1.09 KB)


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