Patch ruby 2.0 Net::HTTP proxy code for IPv6

Ruby 2.0 changes the way proxying is implemented in Net::HTTP such that
each request will check the URI for "proxy-ness." This check will
generate a URL from the given address and port without wrapping IPv6
addresses in brackets, which triggers an error in the URI library.

Check for this case on startup and monkey patch the offending method if
necessary.

1 files changed, 34 insertions, 0 deletions

diff --git a/chef/lib/chef/monkey_patches/net_http.rb b/chef/lib/chef/monkey_patches/net_http.rb
index ad4ba957f6..083db2216b 100644
--- a/chef/lib/chef/monkey_patches/net_http.rb
+++ b/chef/lib/chef/monkey_patches/net_http.rb
@@ -20,3 +20,37 @@ module Net
     include ChefNetHTTPExceptionExtensions
   end
 end
+
+if Net::HTTP.instance_methods.map {|m| m.to_s}.include?("proxy_uri")
+  begin
+    # Ruby 2.0 changes the way proxy support is implemented in Net::HTTP.
+    # The implementation does not work correctly with IPv6 literals because it
+    # concatenates the address into a URI without adding square brackets for
+    # IPv6 addresses.
+    #
+    # If the bug is present, a call to Net::HTTP#proxy_uri when the host is an
+    # IPv6 address will fail by creating an invalid URI, like so:
+    #
+    #    ruby -r'net/http' -e 'Net::HTTP.new("::1", 80).proxy_uri'
+    #    /Users/ddeleo/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/uri/generic.rb:214:in `initialize': the scheme http does not accept registry part: ::1:80 (or bad hostname?) (URI::InvalidURIError)
+    #    	from /Users/ddeleo/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/uri/http.rb:84:in `initialize'
+    #    	from /Users/ddeleo/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/uri/common.rb:214:in `new'
+    #    	from /Users/ddeleo/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/uri/common.rb:214:in `parse'
+    #    	from /Users/ddeleo/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/uri/common.rb:747:in `parse'
+    #    	from /Users/ddeleo/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/uri/common.rb:994:in `URI'
+    #    	from /Users/ddeleo/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/net/http.rb:1027:in `proxy_uri'
+    #    	from -e:1:in `<main>'
+    #
+    # https://bugs.ruby-lang.org/issues/9129
+    Net::HTTP.new("::1", 80).proxy_uri
+  rescue URI::InvalidURIError
+    class Net::HTTP
+
+      def proxy_uri # :nodoc:
+        ipv6_safe_addr = address.to_s.include?(":") ? "[#{address}]" : address
+        @proxy_uri ||= URI("http://#{ipv6_safe_addr}:#{port}").find_proxy
+      end
+
+    end
+  end
+end