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.\" ========================================================================
.\"
.IX Title "WWW::Facebook::API::Canvas 3pm"
.TH WWW::Facebook::API::Canvas 3pm "2010-03-13" "perl v5.10.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
WWW::Facebook::API::Canvas \- Facebook Canvas
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use WWW::Facebook::API;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Methods for using the canvas with WWW::Facebook::API
.PP
The \f(CW$q\fR parameter should implement the param and cookie methods (for example a \s-1CGI\s0 or Apache::Request object).
.SH "SUBROUTINES/METHODS"
.IX Header "SUBROUTINES/METHODS"
.IP "base" 4
.IX Item "base"
Returns the WWW::Facebook::API base object.
.IP "new" 4
.IX Item "new"
Constructor.
.ie n .IP "get_user( $q )" 4
.el .IP "get_user( \f(CW$q\fR )" 4
.IX Item "get_user( $q )"
Return the \s-1UID\s0 of the canvas user or "" if it does not exist (See
\&\s-1DESCRIPTION\s0):
.Sp
.Vb 1
\&    $response = $client\->canvas\->get_user( $q )
.Ve
.Sp
If \f(CW$q\fR is not passed in, the value returned by \f(CW\*(C`$client\->base\->query()\*(C'\fR is
used.
.ie n .IP "get_fb_params( $q )" 4
.el .IP "get_fb_params( \f(CW$q\fR )" 4
.IX Item "get_fb_params( $q )"
Return a hash reference to the signed parameters sent via Facebook (See
\&\s-1DESCRIPTION\s0):
.Sp
.Vb 1
\&    $response = $client\->canvas\->get_fb_params( $q )
.Ve
.Sp
If \f(CW$q\fR is not passed in, the value returned by \f(CW\*(C`$client\->base\->query()\*(C'\fR is
used.
.ie n .IP "get_non_fb_params( $q )" 4
.el .IP "get_non_fb_params( \f(CW$q\fR )" 4
.IX Item "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 \s-1POST\s0 request to
Facebook and you want to use the data you POSTed:
.Sp
.Vb 1
\&    $non_fb_params = $client\->canvas\->get_non_fb_params( $q )
.Ve
.Sp
If \f(CW$q\fR is not passed in, the value returned by \f(CW\*(C`$client\->base\->query()\*(C'\fR is
used.
.ie n .IP "in_fb_canvas( $q )" 4
.el .IP "in_fb_canvas( \f(CW$q\fR )" 4
.IX Item "in_fb_canvas( $q )"
Return true if inside a canvas (See \s-1DESCRIPTION\s0):
.Sp
.Vb 1
\&    $response = $client\->canvas\->in_fb_canvas( $q )
.Ve
.Sp
If \f(CW$q\fR is not passed in, the value returned by \f(CW\*(C`$self\->base\->query()\*(C'\fR is
used.
.ie n .IP "in_frame( $q )" 4
.el .IP "in_frame( \f(CW$q\fR )" 4
.IX Item "in_frame( $q )"
Return true if inside an iframe or canvas (See \s-1DESCRIPTION\s0):
.Sp
.Vb 1
\&    $response = $client\->canvas\->in_frame( $q )
.Ve
.Sp
If \f(CW$q\fR is not passed in, the value returned by \f(CW\*(C`$self\->base\->query()\*(C'\fR is
used.
.ie n .IP "validate_sig( $q )" 4
.el .IP "validate_sig( \f(CW$q\fR )" 4
.IX Item "validate_sig( $q )"
Return a hash reference containing the fb_sig_* params (with \f(CW\*(C`fb_sig_\*(C'\fR
stripped) if the signature of the \f(CW$q\fR object is valid for this application (See
\&\s-1DESCRIPTION\s0):
.Sp
.Vb 2
\&    $fb_params = $client\->canvas\->validate_sig( $q )
\&    # $fb_params doesn\*(Aqt contain a sig key
.Ve
.Sp
If \f(CW$q\fR is not passed in, the value returned by \f(CW\*(C`$self\->base\->query()\*(C'\fR is
used.
.SH "DIAGNOSTICS"
.IX Header "DIAGNOSTICS"
.ie n .IP "Multiple values for %s. Are you using \s-1POST\s0 for forms?" 4
.el .IP "Multiple values for \f(CW%s\fR. Are you using \s-1POST\s0 for forms?" 4
.IX Item "Multiple values for %s. Are you using POST for forms?"
Your forms are most likely using \s-1GET\s0 rather than \s-1POST\s0 to the Facebook URLs.
Change your forms to using \s-1POST\s0 and the problem should be resolved. (See
RT#31620 and RT#31944 for more information).
.SH "CONFIGURATION AND ENVIRONMENT"
.IX Header "CONFIGURATION AND ENVIRONMENT"
WWW::Facebook::API::Canvas requires no configuration files or environment
variables.
.SH "DEPENDENCIES"
.IX Header "DEPENDENCIES"
See WWW::Facebook::API
.SH "INCOMPATIBILITIES"
.IX Header "INCOMPATIBILITIES"
None reported.
.SH "BUGS AND LIMITATIONS"
.IX Header "BUGS AND LIMITATIONS"
No bugs have been reported.
.PP
Please report any bugs or feature requests to
\&\f(CW\*(C`bug\-www\-facebook\-api@rt.cpan.org\*(C'\fR, or through the web interface at
<http://rt.cpan.org>.
.SH "AUTHORS"
.IX Header "AUTHORS"
David Leadbeater  \f(CW\*(C`http://dgl.cx\*(C'\fR
.PP
David Romano  \f(CW\*(C`<unobe@cpan.org>\*(C'\fR
.SH "LICENSE AND COPYRIGHT"
.IX Header "LICENSE AND COPYRIGHT"
Copyright (c) 2007, David Leadbeater \f(CW\*(C`http://dgl.cx\*(C'\fR.
Certain parts copyright (c) 2007\-2010, David Romano \f(CW\*(C`<unobe@cpan.org>\*(C'\fR. All rights reserved.
.PP
This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself. See perlartistic.
.SH "DISCLAIMER OF WARRANTY"
.IX Header "DISCLAIMER OF WARRANTY"
\&\s-1BECAUSE\s0 \s-1THIS\s0 \s-1SOFTWARE\s0 \s-1IS\s0 \s-1LICENSED\s0 \s-1FREE\s0 \s-1OF\s0 \s-1CHARGE\s0, \s-1THERE\s0 \s-1IS\s0 \s-1NO\s0 \s-1WARRANTY\s0
\&\s-1FOR\s0 \s-1THE\s0 \s-1SOFTWARE\s0, \s-1TO\s0 \s-1THE\s0 \s-1EXTENT\s0 \s-1PERMITTED\s0 \s-1BY\s0 \s-1APPLICABLE\s0 \s-1LAW\s0. \s-1EXCEPT\s0 \s-1WHEN\s0
\&\s-1OTHERWISE\s0 \s-1STATED\s0 \s-1IN\s0 \s-1WRITING\s0 \s-1THE\s0 \s-1COPYRIGHT\s0 \s-1HOLDERS\s0 \s-1AND/OR\s0 \s-1OTHER\s0 \s-1PARTIES\s0
\&\s-1PROVIDE\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \*(L"\s-1AS\s0 \s-1IS\s0\*(R" \s-1WITHOUT\s0 \s-1WARRANTY\s0 \s-1OF\s0 \s-1ANY\s0 \s-1KIND\s0, \s-1EITHER\s0
\&\s-1EXPRESSED\s0 \s-1OR\s0 \s-1IMPLIED\s0, \s-1INCLUDING\s0, \s-1BUT\s0 \s-1NOT\s0 \s-1LIMITED\s0 \s-1TO\s0, \s-1THE\s0 \s-1IMPLIED\s0
\&\s-1WARRANTIES\s0 \s-1OF\s0 \s-1MERCHANTABILITY\s0 \s-1AND\s0 \s-1FITNESS\s0 \s-1FOR\s0 A \s-1PARTICULAR\s0 \s-1PURPOSE\s0. \s-1THE\s0
\&\s-1ENTIRE\s0 \s-1RISK\s0 \s-1AS\s0 \s-1TO\s0 \s-1THE\s0 \s-1QUALITY\s0 \s-1AND\s0 \s-1PERFORMANCE\s0 \s-1OF\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1IS\s0 \s-1WITH\s0
\&\s-1YOU\s0. \s-1SHOULD\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1PROVE\s0 \s-1DEFECTIVE\s0, \s-1YOU\s0 \s-1ASSUME\s0 \s-1THE\s0 \s-1COST\s0 \s-1OF\s0 \s-1ALL\s0
\&\s-1NECESSARY\s0 \s-1SERVICING\s0, \s-1REPAIR\s0, \s-1OR\s0 \s-1CORRECTION\s0.
.PP
\&\s-1IN\s0 \s-1NO\s0 \s-1EVENT\s0 \s-1UNLESS\s0 \s-1REQUIRED\s0 \s-1BY\s0 \s-1APPLICABLE\s0 \s-1LAW\s0 \s-1OR\s0 \s-1AGREED\s0 \s-1TO\s0 \s-1IN\s0 \s-1WRITING\s0
\&\s-1WILL\s0 \s-1ANY\s0 \s-1COPYRIGHT\s0 \s-1HOLDER\s0, \s-1OR\s0 \s-1ANY\s0 \s-1OTHER\s0 \s-1PARTY\s0 \s-1WHO\s0 \s-1MAY\s0 \s-1MODIFY\s0 \s-1AND/OR\s0
\&\s-1REDISTRIBUTE\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1AS\s0 \s-1PERMITTED\s0 \s-1BY\s0 \s-1THE\s0 \s-1ABOVE\s0 \s-1LICENSE\s0, \s-1BE\s0
\&\s-1LIABLE\s0 \s-1TO\s0 \s-1YOU\s0 \s-1FOR\s0 \s-1DAMAGES\s0, \s-1INCLUDING\s0 \s-1ANY\s0 \s-1GENERAL\s0, \s-1SPECIAL\s0, \s-1INCIDENTAL\s0,
\&\s-1OR\s0 \s-1CONSEQUENTIAL\s0 \s-1DAMAGES\s0 \s-1ARISING\s0 \s-1OUT\s0 \s-1OF\s0 \s-1THE\s0 \s-1USE\s0 \s-1OR\s0 \s-1INABILITY\s0 \s-1TO\s0 \s-1USE\s0
\&\s-1THE\s0 \s-1SOFTWARE\s0 (\s-1INCLUDING\s0 \s-1BUT\s0 \s-1NOT\s0 \s-1LIMITED\s0 \s-1TO\s0 \s-1LOSS\s0 \s-1OF\s0 \s-1DATA\s0 \s-1OR\s0 \s-1DATA\s0 \s-1BEING\s0
\&\s-1RENDERED\s0 \s-1INACCURATE\s0 \s-1OR\s0 \s-1LOSSES\s0 \s-1SUSTAINED\s0 \s-1BY\s0 \s-1YOU\s0 \s-1OR\s0 \s-1THIRD\s0 \s-1PARTIES\s0 \s-1OR\s0 A
\&\s-1FAILURE\s0 \s-1OF\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1TO\s0 \s-1OPERATE\s0 \s-1WITH\s0 \s-1ANY\s0 \s-1OTHER\s0 \s-1SOFTWARE\s0), \s-1EVEN\s0 \s-1IF\s0
\&\s-1SUCH\s0 \s-1HOLDER\s0 \s-1OR\s0 \s-1OTHER\s0 \s-1PARTY\s0 \s-1HAS\s0 \s-1BEEN\s0 \s-1ADVISED\s0 \s-1OF\s0 \s-1THE\s0 \s-1POSSIBILITY\s0 \s-1OF\s0
\&\s-1SUCH\s0 \s-1DAMAGES\s0.