NAME¶
AnyEvent::XMPP::Ext::VCard - VCards (XEP-0054 & XEP-0084)
SYNOPSIS¶
use AnyEvent::XMPP::Ext::VCard;
my $vcard = AnyEvent::XMPP::Ext::VCard->new;
$con->reg_cb (
stream_ready => sub { $vcard->hook_on ($con) }
);
$vcard->retrieve ($con, 'elmex@jabber.org', sub {
my ($jid, $vcard, $error) = @_;
if ($error) {
warn "couldn't get vcard for elmex@jabber.org: " . $error->string . "\n";
} else {
print "vCard nick for elmex@jabber.org: ".$vcard->{NICKNAME}."\n";
print "Avatar hash for elmex@jabber.org: ".$vcard->{_avatar_hash}."\n";
}
});
$vcard->store ($con, undef, { NICKNAME => 'net-xmpp2' }, sub {
my ($error) = @_;
if ($error) {
warn "upload failed: " . $error->string . "\n";
} else {
print "upload successful\n";
}
});
$disco->enable_feature ($vcard->disco_feature);
DESCRIPTION¶
This extension handles setting and retrieval of the VCard and the VCard based
avatars.
For example see the test suite of AnyEvent::XMPP.
METHODS¶
- new (%args)
- Creates a new vcard extension. It can take a "cache" argument,
which should be a tied hash which should be able to save the retrieved
vcards. If no "cache" is set a internal hash will be used and
the vcards will be retrieved everytime the program is restarted. The keys
will be the stringprepped bare JIDs of the people we got a vcard from and
the value will be a non-cyclic hash/array datastructure representing the
vcard.
About this datastructure see below at VCARD STRUCTURE.
If you want to support avatars correctly make sure you hook up the
connection via the "hook_on" method.
- hook_on ($con, $dont_retrieve_vcard)
- $con must be an object of the class AnyEvent::XMPP::Connection (or
derived). Once the vCard extension has been hooked up on a connection it
will add the avatar information to all outgoing presence stanzas.
IMPORTANT: You need to hook on the connection BEFORE it was
connected. The initial presence stanza needs to contain the information
that we support avatars. The vcard will automatically retrieved if the
session wasn't already started. Otherwise you will have to retrieve the
vcard manually if you hook it up after the "session_ready" event
was received. You can prevent the automatic retrieval by giving a true
value in $dont_retrieve_vcard. However, just make sure to hook up on any
connection before it is connected if you want to offer avatar support on
it.
Best is probably to do it like this:
my $vcard = AnyEvent::XMPP::Ext::VCard->new;
$con->reg_cb (
stream_ready => sub { $vcard->hook_on ($con) }
);
- my_vcard ($con)
- This method returns the vcard for the account connected by $con. This only
works if vcard was (successfully) retrieved. If the connection was hoooked
up the vcard was automatically retrieved.
Alternatively $con can also be a string reprensenting the JID of an
account.
- cache ([$newcache])
- See also "new" about the meaning of cache hashes. If no argument
is given the current cache is returned.
- store ($con, $vcard, $cb)
- This method will store your $vcard on the connected server. $cb is called
when either an error occured or the storage was successful. If an error
occured the first argument is not undefined and contains an
AnyEvent::XMPP::Error::IQ object.
$con should be a AnyEvent::XMPP::Connection or an object from some derived
class.
$vcard has a datastructure as described below in VCARD
STRUCTURE.
- retrieve ($con, $jid, $cb)
- This method will retrieve the vCard for $jid via the connection $con. If
$jid is undefined the vCard of yourself is retrieved. The callback $cb is
called when an error occured or the vcard was retrieved. The first
argument of the callback will be the JID to which the vCard belongs, the
second argument is the vCard itself (as described in VCARD
STRUCTURE below) and the thrid argument is the error, if an error
occured (undef otherwise).
VCARD STRUCTURE¶
As there are currently no nice DOM implementations in Perl and I strongly
dislike the DOM API in general this module has a simple Perl datastructure
without cycles to represent the vCard.
First an example: A fetched vCard hash may look like this:
{
'URL' => ['http://www.ta-sa.org/'],
'ORG' => [{
'ORGNAME' => 'nethype GmbH'
}],
'N' => [{
'FAMILY' => 'Redeker'
}],
'EMAIL' => ['elmex@ta-sa.org'],
'BDAY' => ['1984-06-01'],
'FN' => ['Robin'],
'ADR' => [
{
HOME => undef,
'COUNTRY' => 'Germany'
},
{
WORK => undef,
COUNTRY => 'Germany',
LOCALITY => 'Karlsruhe'
}
],
'NICKNAME' => ['elmex'],
'ROLE' => ['Programmer']
}
The keys represent the toplevel element of a vCard, the values are always array
references containig one or more values for the key. If the value is a hash
reference again it's value will not be an array reference but either undef or
plain values.
The values of the toplevel keys are all array references because fields like
"ADR" may occur multiple times.
Consult XEP-0054 for an explanation what these fields mean or contain.
There are special fields in this structure for handling avatars:
"_avatar" contains the binary data for the avatar image.
"_avatar_hash" contains the sha1 hexencoded hash of the binary image
data. "_avatar_type" contains the mime type of the avatar.
If you want to store the vcard you only have to set "_avatar" and
"_avatar_type" if you want to store an avatar.
EVENTS¶
The vcard extension will emit these events:
TODO¶
Implement caching, the cache stuff is just a storage hash at the moment. Or
maybe drop it completly and let the application handle caching.
- retrieve_vcard_error => $iq_error
- When a vCard retrieval was not successful, this event is emitted. This is
neccessary as some retrievals may happen automatically.
- vcard => $jid, $vcard
- Whenever a vCard is retrieved, either automatically or manually, this
event is emitted with the retrieved vCard.
AUTHOR¶
Robin Redeker, "<elmex at ta-sa.org>", JID: "<elmex at
jabber.org>"
COPYRIGHT & LICENSE¶
Copyright 2007, 2008 Robin Redeker, all rights reserved.
This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.