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#!/usr/bin/perl
#############################################################################
# This is a reference script to validate the checksum in downloadable #
# subscription. This performs the same validation as Adblock Plus when it #
# downloads the subscription. #
# #
# To validate a subscription file, run the script like this: #
# #
# perl validateChecksum.pl subscription.txt #
# #
# Note: your subscription file should be saved in UTF-8 encoding, otherwise #
# the validation result might be incorrect. #
# #
# 20100418: Stolen from ABP with minor modification for AutoProxy project #
#############################################################################
use strict;
use warnings;
use Digest::MD5 qw(md5_base64);
die "Usage: $^X $0 subscription.txt\n" unless @ARGV;
my $file = $ARGV[0];
my $data = readFile($file);
# Normalize data
$data =~ s/\r//g;
$data =~ s/\n+/\n/g;
# Extract checksum
# Remove checksum
$data =~ s/^\s*!\s*checksum[\s\-:]+([\w\+\/=]+).*\n//mi;
my $checksum = $1;
die "Error: couldn't find a checksum in the file\n" unless $checksum;
# Calculate new checksum
my $checksumExpected = md5_base64($data);
# Compare checksums
die "Error: invalid checksum\n" unless $checksum eq $checksumExpected;
sub readFile
{
my $file = shift;
open(local *FILE, "<", $file) || die "Error: could not read file '$file'";
binmode(FILE);
local $/;
my $result = <FILE>;
close(FILE);
return $result;
}