89 lines
2.7 KiB
Perl
89 lines
2.7 KiB
Perl
#!/usr/bin/perl
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#############################################################################
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# This is a reference script to add checksums to downloadable #
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# subscriptions. The checksum will be validated by Adblock Plus on download #
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# and checksum mismatches (broken downloads) will be rejected. #
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# #
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# To add a checksum to a subscription file, run the script like this: #
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# #
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# perl addChecksum.pl subscription.txt #
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# #
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# Note: your subscription file should be saved in UTF-8 encoding, otherwise #
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# the generated checksum might be incorrect. #
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# #
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#############################################################################
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use strict;
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use warnings;
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use Digest::MD5 qw(md5_base64);
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die "Usage: $^X $0 subscription.txt\n" unless @ARGV;
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my $file = $ARGV[0];
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my $data = readFile($file);
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# Get existing checksum.
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$data =~ /^.*#\s*checksum[\s\-:]+([\w\+\/=]+).*\n/gmi;
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my $oldchecksum = $1;
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# Remove already existing checksum
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$data =~ s/^.*#\s*checksum[\s\-:]+([\w\+\/=]+).*\n//gmi;
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# Calculate new checksum: remove all CR symbols and empty
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# lines and get an MD5 checksum of the result (base64-encoded,
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# without the trailing = characters).
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my $checksumData = $data;
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$checksumData =~ s/\r//g;
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$checksumData =~ s/\n+/\n/g;
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# Calculate new checksum
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my $checksum = md5_base64($checksumData);
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# If the old checksum matches the new one bail.
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if ($checksum eq $oldchecksum)
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{
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exit 0;
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}
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# Update the date.
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my @months = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);
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my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime();
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$year += 1900; # Year is years since 1900.
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my $todaysdate = "$mday $months[$mon] $year";
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$data =~ s/(^.*#.*Updated:\s*)(.*)\s*$/$1$todaysdate/gmi;
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# Recalculate the checksum as we've altered the date.
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$checksumData = $data;
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$checksumData =~ s/\r//g;
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$checksumData =~ s/\n+/\n/g;
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$checksum = md5_base64($checksumData);
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# Insert checksum into the file
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$data =~ s/(\r?\n)/$1# Checksum: $checksum$1/;
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writeFile($file, $data);
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sub readFile
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{
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my $file = shift;
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open(local *FILE, "<", $file) || die "Could not read file '$file'";
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binmode(FILE);
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local $/;
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my $result = <FILE>;
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close(FILE);
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return $result;
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}
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sub writeFile
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{
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my ($file, $contents) = @_;
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open(local *FILE, ">", $file) || die "Could not write file '$file'";
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binmode(FILE);
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print FILE $contents;
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close(FILE);
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}
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