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package CGI::Util;
=pod
=head1 NAME
CGI::Util - various utilities
=cut
use strict;
use vars '$VERSION','@EXPORT_OK','@ISA','$EBCDIC','@A2E';
require Exporter;
@ISA = qw(Exporter);
@EXPORT_OK = qw(rearrange make_attributes unescape escape expires);
$VERSION = '1.1';
$EBCDIC = "\t" ne "\011";
if ($EBCDIC) {
@A2E = (
0, 1, 2, 3, 55, 45, 46, 47, 22, 5, 21, 11, 12, 13, 14, 15,
16, 17, 18, 19, 60, 61, 50, 38, 24, 25, 63, 39, 28, 29, 30, 31,
64, 90,127,123, 91,108, 80,125, 77, 93, 92, 78,107, 96, 75, 97,
240,241,242,243,244,245,246,247,248,249,122, 94, 76,126,110,111,
124,193,194,195,196,197,198,199,200,201,209,210,211,212,213,214,
215,216,217,226,227,228,229,230,231,232,233,173,224,189, 95,109,
121,129,130,131,132,133,134,135,136,137,145,146,147,148,149,150,
151,152,153,162,163,164,165,166,167,168,169,192, 79,208,161, 7,
32, 33, 34, 35, 36, 37, 6, 23, 40, 41, 42, 43, 44, 9, 10, 27,
48, 49, 26, 51, 52, 53, 54, 8, 56, 57, 58, 59, 4, 20, 62,255,
65,170, 74,177,159,178,106,181,187,180,154,138,176,202,175,188,
144,143,234,250,190,160,182,179,157,218,155,139,183,184,185,171,
100,101, 98,102, 99,103,158,104,116,113,114,115,120,117,118,119,
172,105,237,238,235,239,236,191,128,253,254,251,252,186,174, 89,
68, 69, 66, 70, 67, 71,156, 72, 84, 81, 82, 83, 88, 85, 86, 87,
140, 73,205,206,203,207,204,225,112,221,222,219,220,141,142,223
);
}
# Smart rearrangement of parameters to allow named parameter
# calling. We do the rearangement if:
# the first parameter begins with a -
sub rearrange {
my($order,@param) = @_;
return () unless @param;
if (ref($param[0]) eq 'HASH') {
@param = %{$param[0]};
} else {
return @param
unless (defined($param[0]) && substr($param[0],0,1) eq '-');
}
# map parameters into positional indices
my ($i,%pos);
$i = 0;
foreach (@$order) {
foreach (ref($_) eq 'ARRAY' ? @$_ : $_) { $pos{$_} = $i; }
$i++;
}
my (@result,%leftover);
$#result = $#$order; # preextend
while (@param) {
my $key = uc(shift(@param));
$key =~ s/^\-//;
if (exists $pos{$key}) {
$result[$pos{$key}] = shift(@param);
} else {
$leftover{$key} = shift(@param);
}
}
push (@result,make_attributes(\%leftover)) if %leftover;
@result;
}
sub make_attributes {
my $attr = shift;
return () unless $attr && ref($attr) && ref($attr) eq 'HASH';
my $escape = shift || 0;
my(@att);
foreach (keys %{$attr}) {
my($key) = $_;
$key=~s/^\-//; # get rid of initial - if present
$key=~tr/a-z_/A-Z-/; # parameters are upper case, use dashes
my $value = $escape ? simple_escape($attr->{$_}) : $attr->{$_};
push(@att,defined($attr->{$_}) ? qq/$key="$value"/ : qq/$key/);
}
return @att;
}
sub simple_escape {
return unless defined (my $toencode = shift);
$toencode =~ s{(.)}{
if ($1 eq '<') { '<' }
elsif ($1 eq '>') { '>' }
elsif ($1 eq '&') { '&' }
elsif ($1 eq '"') { '"' }
elsif ($1 eq "\x8b") { '‹' }
elsif ($1 eq "\x9b") { '›' }
else { $1 }
}gsex;
$toencode;
}
# unescape URL-encoded data
sub unescape {
shift() if ref($_[0]) || (defined $_[1] && $_[0] eq $CGI::DefaultClass);
my $todecode = shift;
return undef unless defined($todecode);
$todecode =~ tr/+/ /; # pluses become spaces
if ($EBCDIC) {
$todecode =~ s/%([0-9a-fA-F]{2})/chr $A2E[hex($1)]/ge;
} else {
$todecode =~ s/%([0-9a-fA-F]{2})/chr hex($1)/ge;
}
return $todecode;
}
# URL-encode data
sub escape {
shift() if ref($_[0]) || (defined $_[1] && $_[0] eq $CGI::DefaultClass);
my $toencode = shift;
return undef unless defined($toencode);
$toencode=~s/([^a-zA-Z0-9_.-])/uc sprintf("%%%02x",ord($1))/eg;
return $toencode;
}
# This internal routine creates date strings suitable for use in
# cookies and HTTP headers. (They differ, unfortunately.)
# Thanks to Mark Fisher for this.
sub expires {
my($time,$format) = @_;
$format ||= 'http';
my(@MON)=qw/Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec/;
my(@WDAY) = qw/Sun Mon Tue Wed Thu Fri Sat/;
# pass through preformatted dates for the sake of expire_calc()
$time = expire_calc($time);
return $time unless $time =~ /^\d+$/;
# make HTTP/cookie date string from GMT'ed time
# (cookies use '-' as date separator, HTTP uses ' ')
my($sc) = ' ';
$sc = '-' if $format eq "cookie";
my($sec,$min,$hour,$mday,$mon,$year,$wday) = gmtime($time);
$year += 1900;
return sprintf("%s, %02d$sc%s$sc%04d %02d:%02d:%02d GMT",
$WDAY[$wday],$mday,$MON[$mon],$year,$hour,$min,$sec);
}
# This internal routine creates an expires time exactly some number of
# hours from the current time. It incorporates modifications from
# Mark Fisher.
sub expire_calc {
my($time) = @_;
my(%mult) = ('s'=>1,
'm'=>60,
'h'=>60*60,
'd'=>60*60*24,
'M'=>60*60*24*30,
'y'=>60*60*24*365);
# format for time can be in any of the forms...
# "now" -- expire immediately
# "+180s" -- in 180 seconds
# "+2m" -- in 2 minutes
# "+12h" -- in 12 hours
# "+1d" -- in 1 day
# "+3M" -- in 3 months
# "+2y" -- in 2 years
# "-3m" -- 3 minutes ago(!)
# If you don't supply one of these forms, we assume you are
# specifying the date yourself
my($offset);
if (!$time || (lc($time) eq 'now')) {
$offset = 0;
} elsif ($time=~/^\d+/) {
return $time;
} elsif ($time=~/^([+-]?(?:\d+|\d*\.\d*))([mhdMy]?)/) {
$offset = ($mult{$2} || 1)*$1;
} else {
return $time;
}
return (time+$offset);
}
1;
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