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package CPANPLUS::Module::Checksums;
use strict;
use vars qw[@ISA $VERSION];
use CPANPLUS::Error;
use CPANPLUS::Internals::Constants;
use FileHandle;
use Locale::Maketext::Simple Class => 'CPANPLUS', Style => 'gettext';
use Params::Check qw[check];
use Module::Load::Conditional qw[can_load];
$Params::Check::VERBOSE = 1;
@ISA = qw[ CPANPLUS::Module::Signature ];
$VERSION = "0.9138";
=head1 NAME
CPANPLUS::Module::Checksums - checking the checksum of a distribution
=head1 SYNOPSIS
$file = $modobj->checksums;
$bool = $mobobj->_validate_checksum;
=head1 DESCRIPTION
This is a class that provides functions for checking the checksum
of a distribution. Should not be loaded directly, but used via the
interface provided via C<CPANPLUS::Module>.
=head1 METHODS
=head2 $mod->checksums
Fetches the checksums file for this module object.
For the options it can take, see C<CPANPLUS::Module::fetch()>.
Returns the location of the checksums file on success and false
on error.
The location of the checksums file is also stored as
$mod->status->checksums
=cut
sub checksums {
my $mod = shift or return;
my $file = $mod->_get_checksums_file( @_ );
return $mod->status->checksums( $file ) if $file;
return;
}
### checks if the package checksum matches the one
### from the checksums file
sub _validate_checksum {
my $self = shift; #must be isa CPANPLUS::Module
my $conf = $self->parent->configure_object;
my %hash = @_;
my $verbose;
my $tmpl = {
verbose => { default => $conf->get_conf('verbose'),
store => \$verbose },
};
check( $tmpl, \%hash ) or return;
### if we can't check it, we must assume it's ok ###
return $self->status->checksum_ok(1)
unless can_load( modules => { 'Digest::SHA' => '0.0' } );
#class CPANPLUS::Module::Status is runtime-generated
my $file = $self->_get_checksums_file( verbose => $verbose ) or (
error(loc(q[Could not fetch '%1' file], CHECKSUMS)), return );
$self->_check_signature_for_checksum_file( file => $file ) or (
error(loc(q[Could not verify '%1' file], CHECKSUMS)), return );
#for whole CHECKSUMS file
my $href = $self->_parse_checksums_file( file => $file ) or (
error(loc(q[Could not parse '%1' file], CHECKSUMS)), return );
my $size = $href->{ $self->package }->{'size'};
### the checksums file tells us the size of the archive
### but the downloaded file is of different size
if( defined $size ) {
if( not (-s $self->status->fetch == $size) ) {
error(loc( "Archive size does not match for '%1': " .
"size is '%2' but should be '%3'",
$self->package, -s $self->status->fetch, $size));
return $self->status->checksum_ok(0);
}
} else {
msg(loc("Archive size is not known for '%1'",$self->package),$verbose);
}
my $sha = $href->{ $self->package }->{'sha256'};
unless( defined $sha ) {
msg(loc("No 'sha256' checksum known for '%1'",$self->package),$verbose);
return $self->status->checksum_ok(1);
}
$self->status->checksum_value($sha);
my $fh = FileHandle->new( $self->status->fetch ) or return;
binmode $fh;
my $ctx = Digest::SHA->new(256);
$ctx->addfile( $fh );
my $hexdigest = $ctx->hexdigest;
my $flag = $hexdigest eq $sha;
$flag
? msg(loc("Checksum matches for '%1'", $self->package),$verbose)
: error(loc("Checksum does not match for '%1': " .
"SHA256 is '%2' but should be '%3'",
$self->package, $hexdigest, $sha),$verbose);
return $self->status->checksum_ok(1) if $flag;
return $self->status->checksum_ok(0);
}
### fetches the module objects checksum file ###
sub _get_checksums_file {
my $self = shift;
my %hash = @_;
my $clone = $self->clone;
$clone->package( CHECKSUMS );
# If the user specified a fetchdir, then every CHECKSUMS file will always
# be stored there, not in an author-specific subdir. Thus, in this case,
# we need to always re-fetch the CHECKSUMS file and hence need to set the
# TTL to something small.
my $have_fetchdir =
$self->parent->configure_object->get_conf('fetchdir') ne '';
my $ttl = $have_fetchdir ? 0.001 : 3600;
my $file = $clone->fetch( ttl => $ttl, %hash ) or return;
return $file;
}
sub _parse_checksums_file {
my $self = shift;
my %hash = @_;
my $file;
my $tmpl = {
file => { required => 1, allow => FILE_READABLE, store => \$file },
};
my $args = check( $tmpl, \%hash );
my $fh = OPEN_FILE->( $file ) or return;
### loop over the header, there might be a pgp signature ###
my $signed;
while (local $_ = <$fh>) {
last if /^\$cksum = \{\s*$/; # skip till this line
my $header = PGP_HEADER; # but be tolerant of whitespace
$signed = 1 if /^${header}\s*$/;# due to crossplatform linebreaks
}
### read the filehandle, parse it rather than eval it, even though it
### *should* be valid perl code
my $dist;
my $cksum = {};
while (local $_ = <$fh>) {
if (/^\s*'([^']+)' => \{\s*$/) {
$dist = $1;
} elsif (/^\s*'([^']+)' => '?([^'\n]+)'?,?\s*$/ and defined $dist) {
$cksum->{$dist}{$1} = $2;
} elsif (/^\s*}[,;]?\s*$/) {
undef $dist;
} elsif (/^__END__\s*$/) {
last;
} else {
error( loc("Malformed %1 line: %2", CHECKSUMS, $_) );
}
}
return $cksum;
}
sub _check_signature_for_checksum_file {
my $self = shift;
my $conf = $self->parent->configure_object;
my %hash = @_;
### you don't want to check signatures,
### so let's just return true;
return 1 unless $conf->get_conf('signature');
my($force,$file,$verbose);
my $tmpl = {
file => { required => 1, allow => FILE_READABLE, store => \$file },
force => { default => $conf->get_conf('force'), store => \$force },
verbose => { default => $conf->get_conf('verbose'), store => \$verbose },
};
my $args = check( $tmpl, \%hash ) or return;
my $fh = OPEN_FILE->($file) or return;
my $signed;
while (local $_ = <$fh>) {
my $header = PGP_HEADER;
$signed = 1 if /^$header$/;
}
if ( !$signed ) {
msg(loc("No signature found in %1 file '%2'",
CHECKSUMS, $file), $verbose);
return 1 unless $force;
error( loc( "%1 file '%2' is not signed -- aborting",
CHECKSUMS, $file ) );
return;
}
if( can_load( modules => { 'Module::Signature' => '0.06' } ) ) {
# local $Module::Signature::SIGNATURE = $file;
# ... check signatures ...
}
return 1;
}
# Local variables:
# c-indentation-style: bsd
# c-basic-offset: 4
# indent-tabs-mode: nil
# End:
# vim: expandtab shiftwidth=4:
1;
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