WWW::Finger::Webfinger(3) WWW::Finger module for Webfinger

DESCRIPTION

Webfinger is currently a very unstable specification, with implementation details changing all the time. Given this instability, it seems prudent to describe the protocol, as implemented by this package.

Given an e-mail-like identifier, the package will prepend ``acct:'' to it, assuming that the identifier doesn't already have a URI scheme. This identifier will now be called [ident].

The package looks up the host-meta file associated with the host for [ident]. It is assumed to be formatted according to the draft-hammer-hostmeta-05 Internet Draft http://tools.ietf.org/html/draft-hammer-hostmeta-05 <http://tools.ietf.org/html/draft-hammer-hostmeta-05> and XRD Working Draft 10 <http://www.oasis-open.org/committees/download.php/35274/xrd-1.0-wd10.html>. Both these drafts are dated 19 November 2009.

A link template will be extracted from the host-meta for the host using either of the following two relationships: <http://lrdd.net/rel/descriptor>, <http://www.iana.org/assignments/relation/lrdd>. (Neither is prioritised, so if both exist and have different templates, hilarity will ensue.)

The token ``{uri}'' in the link template will be replaced with the URL-encoded version of [ident] to create an account descriptor URI.

The account descriptor URI is fetched via HTTP GET with an Accept header asking for RDF/XML, Turtle, RDF/JSON or XRD. The result is parsed for account description data if it has status code 200 (OK).

The following relationships/properties are understood in the account description:

As well as the standard WWW::Finger methods, WWW::Finger::Webfinger provides this additional method:

"get($p1, $p2, ...)"
$p1, $p2 and are RDF predicate URIs, XRD [email protected] values, or XRD [email protected] values

  # Returns phone numbers...
  $finger->get('http://xmlns.com/foaf/0.1/phone',
               'http://rdf.data-vocabulary.org/#tel');
  
  # Salmon-style magic keys
  $finger->get('magic-public-key');

AUTHOR

Toby Inkster, <[email protected]>

COPYRIGHT AND LICENCE

Copyright (C) 2009-2012 by Toby Inkster

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

DISCLAIMER OF WARRANTIES

THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.