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=head1 NAME |
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XAO::DO::Web::CgiParam - Retrieves parameter from CGI environment |
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=head1 SYNOPSIS |
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<%CgiParam param="username" default="test"%> |
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=head1 DESCRIPTION |
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Displays CGI parameter. Arguments are: |
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name => parameter name |
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default => default text |
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=cut |
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############################################################################### |
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package XAO::DO::Web::CgiParam; |
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use strict; |
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use XAO::Utils; |
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use XAO::Errors qw(XAO::DO::Web::CgiParam); |
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use base XAO::Objects->load(objname => 'Web::Page'); |
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our $VERSION='2.2'; |
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sub display ($;%) { |
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my $self=shift; |
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my $args=get_args(\@_); |
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my $name=$args->{'name'} || $args->{'param'} || |
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throw $self "- no 'param' and no 'name' given"; |
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my $text; |
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$text=$self->cgi->param($name); |
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$text=$args->{'default'} unless defined $text; |
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return unless defined $text; |
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# Preventing XSS attacks. Unless we have a 'dont_sanitize' parameter |
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# angle brackets are removed from the output. |
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# |
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if(!$args->{'dont_sanitize'}) { |
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$text=~s/[<>]/ /sg; |
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} |
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# Zero bytes trigger a strange bug in at least some combinations of |
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# Apache and XAO::Web. Repeated requests that send something like |
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# ?foo=bar%00 that use CgiParam sometimes result in Apache hanging |
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# even though processing is done. There is almost never a real need |
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# to send a zero byte as an inline CGI parameter, so filtering it |
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# out. |
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# |
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if(!$args->{'keep_zeros'}) { |
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$text=~s/\x00/ /sg; |
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} |
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# Trimming spaces |
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# |
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if(!$args->{'keep_spaces'}) { |
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$text=~s/^\s*|\s*$//sg; |
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} |
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$self->textout($text); |
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} |
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############################################################################### |
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1; |
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__END__ |