gfwlist/addChecksum.pl

74 lines
2.3 KiB
Perl
Raw Normal View History

2009-03-11 08:36:57 +00:00
#!/usr/bin/perl
#############################################################################
# This is a reference script to add checksums to downloadable #
# subscriptions. The checksum will be validated by AutoProxy on download #
# and checksum mismatches (broken downloads) will be rejected. #
# #
# To add a checksum to a subscription file, run the script like this: #
# #
# perl addChecksum.pl subscription.txt #
# #
# Note: your subscription file should be saved in UTF-8 encoding, otherwise #
# the generated checksum might be incorrect. #
# #
#############################################################################
use strict;
use warnings;
use Digest::MD5 qw(md5_base64);
use File::stat;
use POSIX qw(locale_h);
use POSIX qw(strftime);
2009-03-11 08:36:57 +00:00
die "Usage: $^X $0 subscription.txt\n" unless @ARGV;
my $file = $ARGV[0];
my $data = readFile($file);
# Remove already existing checksum
$data =~ s/^.*!\s*checksum[\s\-:]+([\w\+\/=]+).*\n//gmi;
# Update timestamp
setlocale(LC_TIME, "C");
my $timestamp = strftime("%a, %d %b %Y %H:%M:%S %z", localtime(stat($file)->mtime));
$data =~ s/^!\s*Last Modified:.*$/! Last Modified: $timestamp/mi;
2009-03-11 08:36:57 +00:00
# Calculate new checksum: remove all CR symbols and empty
# lines and get an MD5 checksum of the result (base64-encoded,
# without the trailing = characters).
my $checksumData = $data;
$checksumData =~ s/\r//g;
$checksumData =~ s/\n+/\n/g;
# Calculate new checksum
my $checksum = md5_base64($checksumData);
# Insert checksum into the file
$data =~ s/(\r?\n)/$1! Checksum: $checksum$1/;
writeFile($file, $data);
sub readFile
{
my $file = shift;
open(local *FILE, "<", $file) || die "Could not read file '$file'";
binmode(FILE);
local $/;
my $result = <FILE>;
close(FILE);
return $result;
}
sub writeFile
{
my ($file, $contents) = @_;
open(local *FILE, ">", $file) || die "Could not write file '$file'";
binmode(FILE);
print FILE $contents;
close(FILE);
}