Version 0.1.2

Ruby Bindings for the GNU LibIDN library, an implementation of the Stringprep, Punycode and IDNA specifications defined by the IETF Internationalized Domain Names (IDN) working group.

Included are the most important parts of the Stringprep, Punycode and IDNA APIs like performing Stringprep processings, encoding to and decoding from Punycode strings and converting entire domain names to and from the ACE encoded form.

The latest version of the LibIDN Ruby Bindings project and its documentation can always be found at

• https://github.com/deepfryed/idn-ruby

The original version can be found at,

• http://rubyforge.org/projects/idn

See the CHANGES file for detailed information on the changes of every released version.

• GNU LibIDN Library

• Rake to run the tests and generate the documentation

• RubyGems to produce a Gem package

• Ruby 1.9.1 or above. Patches welcome to make this work in 1.8.7

You need GNU LibIDN installed first.

• On MacOS you can install it with brew install libidn
• On Debian flavours of Linux apt-get install libidn11-dev

You can easily install the LibIDN Ruby Bindings by following one of the ways outlined below:

Simply invoke the standard RubyGems commands (install, update, ...), for example:

gem install --remote idn-ruby

or if the GNU LibIDN library can only be found in a non-standard location

gem install --remote idn-ruby \
  --with-idn-dir=/path/to/non/standard/location

or in an even more complex setup

gem install --remote idn-ruby -- \
  --with-idn-lib=/path/to/non/standard/location/lib \
  --with-idn-include=/path/to/non/standard/location/include

gem install idn-ruby -- --with-idn-dir=$(brew --prefix libidn)

If you are not able to or don't want to use RubyGems you can simply download the latest release and install it with the help of Rake:

tar -xvzf idn-x.x.x.tar.gz
cd idn-x.x.x

rake install

or if the GNU LibIDN library can only be found in a non-standard location

rake install IDN_DIR=/path/to/non/standard/location

You can also run the tests or generate the documentation; just call Rake with the '--tasks' parameter to get an overview of the available tasks:

rake --tasks

If you are not able to or don't want to use even Rake then you will have to do a little bit more work by yourself:

tar -xvzf idn-x.x.x.tar.gz
cd idn-x.x.x/ext

ruby extconf.rb

or if the GNU LibIDN library can only be found in a non-standard location

ruby extconf.rb \
  --with-idn-dir=/path/to/non/standard/location

or in an even more complex setup

ruby extconf.rb \
  --with-idn-lib=/path/to/non/standard/location/lib \
  --with-idn-include=/path/to/non/standard/location/include

and finally

make
sudo make install

The complete documentation is available online at

• http://rubydoc.info/github/deepfryed/idn-ruby/master/frames

require 'idn'
include IDN

puts 'Idna.toUnicode: ' + Idna.toUnicode('xn--rksmrgs-5wao1o.josefsson.org')
puts 'Punycode.decode: ' + Punycode.decode('egbpdaj6bu4bxfgehfvwxn')
puts 'Stringprep.with_profile: ' + Stringprep.with_profile('FOO', 'Nameprep')

[GNU LibIDN] An implementation of the Stringprep, Punycode and IDNA specifications defined by the IETF Internationalized Domain Names (IDN) working group, used for internationalized domain names. The package is available under the GNU Lesser General Public License.

• http://www.gnu.org/software/libidn

[RFC3454] P. Hoffman, M. Blanchet, "Preparation of Internationalized Strings ('stringprep')", IETF RFC3454, December 2002.

• http://www.ietf.org/rfc/rfc3454.txt

[RFC3490] P. Faltstrom, P. Hoffman, A. Costello, "Internationalizing Domain Names in Applications (IDNA)", IETF RFC3490, March 2003.

• http://www.ietf.org/rfc/rfc3490.txt

[RFC3491] P. Hoffman, M. Blanchet, "Nameprep: A Stringprep Profile for Internationalized Domain Names (IDN)", IETF RFC3491, March 2003.

• http://www.ietf.org/rfc/rfc3491.txt

[RFC3492] A. Costello, "Punycode: A Bootstring encoding of Unicode for Internationalized Domain Names in Applications (IDNA)", IETF RFC3492, March 2003.

• http://www.ietf.org/rfc/rfc3492.txt

If you have any questions, comments or feature requests or if you want to submit a bug report or provide a patch, then have a look at the project website at

• https://github.com/deepfryed/idn-ruby
• http://rubyforge.org/projects/idn (original)

For other information, feel free to ask on the idn-discuss at rubyforge.org mailing list.

Copyright (c) 2005-2006 Erik Abele. 2011 Bharanee Rathna. All rights reserved.

This documentation and the software itself are licensed under the Apache License, Version 2.0 (the "License").

Some portions of the software come with separate copyright notices and are subject to additional license terms. Please see the file called LICENSE for further details on these subcomponents of the software.

You may also obtain a copy of the License at

• http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

This software is OSI Certified Open Source Software. OSI Certified is a certification mark of the Open Source Initiative.