56 lines
1.8 KiB
Perl
Executable File
56 lines
1.8 KiB
Perl
Executable File
#!/usr/bin/perl
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#############################################################################
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# This is a reference script to validate the checksum in downloadable #
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# subscription. This performs the same validation as Adblock Plus when it #
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# downloads the subscription. #
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# #
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# To validate a subscription file, run the script like this: #
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# #
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# perl validateChecksum.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 validation result might be incorrect. #
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# #
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# 20100418: Stolen from ABP with minor modification for AutoProxy project #
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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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# Normalize data
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$data =~ s/\r//g;
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$data =~ s/\n+/\n/g;
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# Extract checksum
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# Remove checksum
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$data =~ s/^\s*!\s*checksum[\s\-:]+([\w\+\/=]+).*\n//mi;
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my $checksum = $1;
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die "Error: couldn't find a checksum in the file\n" unless $checksum;
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# Calculate new checksum
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my $checksumExpected = md5_base64($data);
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# Compare checksums
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die "Error: invalid checksum\n" unless $checksum eq $checksumExpected;
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sub readFile
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{
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my $file = shift;
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open(local *FILE, "<", $file) || die "Error: could not read file '$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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