NAME

       WWW::Facebook::API::Canvas - Facebook Canvas

SYNOPSIS

           use WWW::Facebook::API;

DESCRIPTION

       Methods for using the canvas with WWW::Facebook::API

       The $q parameter should implement the param and cookie methods (for example a CGI or Apache::Request
       object).

SUBROUTINES/METHODS

       base
           Returns the WWW::Facebook::API base object.

       new Constructor.

       get_user( $q )
           Return the UID of the canvas user or "" if it does not exist (See DESCRIPTION):

               $response = $client->canvas->get_user( $q )

           If $q is not passed in, the value returned by "$client->base->query()" is used.

       get_fb_params( $q )
           Return a hash reference to the signed parameters sent via Facebook (See DESCRIPTION):

               $response = $client->canvas->get_fb_params( $q )

           If $q is not passed in, the value returned by "$client->base->query()" is used.

       get_non_fb_params( $q )
           Return  a  hash reference to the parameters that are not part of the signed facebook parameters. This
           is useful if your app send a POST request to Facebook and you want to use the data you POSTed:

               $non_fb_params = $client->canvas->get_non_fb_params( $q )

           If $q is not passed in, the value returned by "$client->base->query()" is used.

       in_fb_canvas( $q )
           Return true if inside a canvas (See DESCRIPTION):

               $response = $client->canvas->in_fb_canvas( $q )

           If $q is not passed in, the value returned by "$self->base->query()" is used.

       in_frame( $q )
           Return true if inside an iframe or canvas (See DESCRIPTION):

               $response = $client->canvas->in_frame( $q )

           If $q is not passed in, the value returned by "$self->base->query()" is used.

       validate_sig( $q )
           Return a hash reference containing the fb_sig_* params (with "fb_sig_" stripped) if the signature  of
           the $q object is valid for this application (See DESCRIPTION):

               $fb_params = $client->canvas->validate_sig( $q )
               # $fb_params doesn't contain a sig key

           If $q is not passed in, the value returned by "$self->base->query()" is used.

DIAGNOSTICS

       Multiple values for %s. Are you using POST for forms?
           Your  forms  are  most  likely using GET rather than POST to the Facebook URLs.  Change your forms to
           using POST and the problem should be resolved. (See RT#31620 and RT#31944 for more information).

CONFIGURATION AND ENVIRONMENT

       WWW::Facebook::API::Canvas requires no configuration files or environment variables.

DEPENDENCIES

       See WWW::Facebook::API

INCOMPATIBILITIES

       None reported.

BUGS AND LIMITATIONS

       No bugs have been reported.

       Please report any bugs or feature requests to  "bug-www-facebook-api@rt.cpan.org",  or  through  the  web
       interface at <http://rt.cpan.org>.

AUTHORS

       David Leadbeater  "http://dgl.cx"

       David Romano  "<unobe@cpan.org>"

LICENSE AND COPYRIGHT

       Copyright  (c)  2007,  David  Leadbeater  "http://dgl.cx".   Certain parts copyright (c) 2007-2010, David
       Romano "<unobe@cpan.org>". All rights reserved.

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

DISCLAIMER OF WARRANTY

       BECAUSE  THIS  SOFTWARE  IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT
       PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS  AND/OR  OTHER
       PARTIES  PROVIDE  THE  SOFTWARE  "AS  IS"  WITHOUT  WARRANTY  OF  ANY  KIND, EITHER EXPRESSED OR IMPLIED,
       INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND  FITNESS  FOR  A  PARTICULAR
       PURPOSE.  THE  ENTIRE  RISK  AS  TO  THE  QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE
       SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.

       IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER,  OR  ANY
       OTHER  PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENSE, BE LIABLE
       TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING  OUT  OF
       THE  USE  OR  INABILITY  TO  USE  THE  SOFTWARE  (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
       RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE  TO  OPERATE
       WITH  ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
       DAMAGES.

perl v5.34.0                                       2022-06-28                    WWW::Facebook::API::Canvas(3pm)