#!/usr/bin/perl -Tw
use strict;
use Storable qw/lock_store lock_retrieve/;
use CGI qw/:standard/;
#########################
# Begin Config
# File to store 'rotate' data in.
# CGI instance must have read/write access
my $data_file = '/var/www/images.dat';
# Image to show if there's an error
# ie: "Error", "404 Not Found" image
my $err_img = '/var/www/images/err.jpg';
# Catagories for 'rotate' and 'random'
# Keys are the catagory names to pass as 'c' argument,
# arrays are the directories for that catagory.
my $cat = {
'banners' =>
['/home/user/imgs/banners', '/home/user/imgs/banners2'],
'logos' =>
['/home/user/imgs/logos', '/home/user/imgs/logos2']
};
#########################
# End Config
# Automatically generate an 'all' catagory
@{$cat->{'all'}} = map{@{$cat->{$_}}}keys %{$cat};
# Rotate the image number for a catagory
sub rotate_img {
my $q = shift;
my @imgs = get_imgs(@{$cat->{$q}});
my $data = -e $data_file ? lock_retrieve($data_file) : {};
$data->{$q} = 0 if $data->{$q}++ == $#imgs;
lock_store $data, $data_file;
return $imgs[$data->{$q}];
}
# Get list of images from directories
sub get_imgs {
sort grep {-f && /(?:\.gif|jpe?g|png)$/i }
map{ glob("$_/*") } @_
}
# Output an image to the browser
sub show_img {
my $img = shift;
my ($mime) = $img =~ /\.(gif|jpe?g|png)$/;
$mime = 'jpeg' if $mime eq 'jpg';
open my $fh, '<', $img
or die "Could not open $img for read: $!";
binmode $fh;
my $img_data = do { local $/; <$fh> };
close $fh;
print header('image/' . $mime), $img_data;
exit;
}
my $m = param('m') || ''; # Mode
my $c = param('c') || ''; # Catagory
# Rotated image
if ($m eq 'rotate') {
show_img( $cat->{$c} ? rotate_img($c) : $err_img );
}
# Random image
elsif ($m eq 'random') {
show_img($err_img) unless $cat->{$c};
my @imgs = get_imgs(@{$cat->{$c}});
show_img($imgs[rand @imgs]);
}
# Specific Image
elsif ($m eq 'image') {
($m,$c) = split(/\//, $c, 2);
show_img($err_img) unless
$cat->{$m} && $c;
for ( get_imgs(@{$cat->{$m}}) ) {
show_img($_) if m#/\Q$c\E\.(?:gif|jpe?g|png)$#;
}
show_img($err_img);
}
# Invalid Call
else {
show_img($err_img);
}
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