NAME

       Domain::PublicSuffix - Parse a domain down to root

SYNOPSIS

        use Domain::PublicSuffix;

        my $suffix = Domain::PublicSuffix->new({
          'data_file' => '/tmp/effective_tld_names.dat'
        });
        my $root = $suffix->get_root_domain('www.google.com');
        # $root now contains "google.com"

        $root = $suffix->get_root_domain('www.google.co.uk');
        # $root now contains google.co.uk

        my $tld = $suffix->tld();
        # $tld now contains co.uk

DESCRIPTION

       This module utilizes the "effective_tld_names.dat" provided by Mozilla as a way to
       effectively reduce a fully qualified domain name down to the absolute root.  The Mozilla
       PublicSuffix file is an open source, fully documented format that shows absolute root
       TLDs, primarily for Mozilla's browser products to be able to determine how far a cookie's
       security boundaries go.

       This module will attempt to search etc directories in /usr/share/publicsuffix, /usr,
       /usr/local, and /opt/local for the effective_tld_names.dat file. If a file is not found, a
       default file is loaded from Domain::PublicSuffix::Default, which is current at the time of
       the module's release. You can override the data file path by giving the new() method a
       'data_file' argument.

       When creating a new PublicSuffix object, the module will load the data file as specified,
       and use the internal structure to parse each domain sent to the get_root_domain method. To
       re-parse the file, you must destroy and create a new object, or execute the
       _parse_data_file method directly, though that is not recommended.

PUBLIC ACCESSORS

       error()
           On unsuccessful parse, contains a human-readable error string.

       suffix()
           Returns the effective tld of the last parsed domain. For the domain 'google.co.uk',
           this would return 'co.uk'.

       tld()
           Returns the true DNS tld of the last parsed domain. For the domain 'google.co.uk',
           this would return 'uk'.

PUBLIC METHODS

       new(\%arguments)
           Instantiate a PublicSuffix object. It is best to instantiate an object and continue
           calling get_root_domain instead of continually recreating the object, as the data file
           is read and parsed on instantiation.

           Can take a hashref of arguments:

           data_file
               A fully qualified path, to override the effective_tld_names.dat file.

           use_default
               Use the provided publicsuffix file, do not search for any other files.

           domain_allow_underscore
               A flag to indicate that underscores should be allowed in hostnames (contra to the
               RFCs). Default: undef.

           allow_unlisted_tld
               A flag to indicate that unlisted TLDs should be passed through. This follows the
               spec as listed on publicsuffix.org, but is not how this module works by default,
               or before 0.16. Default: undef

       get_root_domain( $domain )
           Given a fully qualified domain name, return the parsed root domain name.  Returns
           undefined if an error occurs parsing the given domain, and fills the error accessor
           with a human-readable error string.

SEE ALSO

       •   GitHub

           <http://www.github.com/nmelnick/Domain-PublicSuffix>

       •   Current List:

           <http://mxr.mozilla.org/mozilla-central/source/netwerk/dns/effective_tld_names.dat?raw=1>
           [mxr.mozilla.org]

       •   Mozilla Documentation:

           <http://wiki.mozilla.org/Gecko:TLD_Service>

       •   Public Info Site:

           <http://publicsuffix.org/>

BUGS

       Please report any bugs or feature requests to "bug-domain-publicsuffix at rt.cpan.org", or
       through the web interface at
       <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Domain-PublicSuffix>.  I will be notified,
       and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

       You can find documentation for this module with the perldoc command.

         perldoc Domain::PublicSuffix

       You can also look for information at:

       •   RT: CPAN's request tracker

           <http://rt.cpan.org/NoAuth/Bugs.html?Dist=Domain-PublicSuffix>

       •   AnnoCPAN: Annotated CPAN documentation

           <http://annocpan.org/dist/Domain-PublicSuffix>

       •   CPAN Ratings

           <http://cpanratings.perl.org/d/Domain-PublicSuffix>

       •   Search CPAN

           <http://search.cpan.org/dist/Domain-PublicSuffix>

CONTRIBUTORS

       dkg: Daniel Kahn Gillmor

       gavinc: Gavin Carr

       jwieland: Jason Wieland

COPYRIGHT & LICENSE

       Copyright 2008-16 Nicholas Melnick, "nick at abstractwankery.com".

       This program is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.