Commit | Line | Data |
c4a322ec |
1 | |
2 | package MooseX::Storage::Base::WithChecksum; |
3 | use Moose::Role; |
4 | |
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5 | use Digest (); |
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6 | use Data::Dumper (); |
7 | |
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8 | use MooseX::Storage::Engine; |
9 | |
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10 | our $VERSION = '0.01'; |
11 | our $AUTHORITY = 'cpan:STEVAN'; |
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12 | |
72a40e08 |
13 | our $DIGEST_MARKER = '__DIGEST__'; |
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14 | |
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15 | sub pack { |
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16 | my ($self, @args ) = @_; |
17 | |
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18 | my $e = MooseX::Storage::Engine->new( object => $self ); |
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19 | |
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20 | my $collapsed = $e->collapse_object(@args); |
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21 | |
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22 | $collapsed->{$DIGEST_MARKER} = $self->_digest_packed($collapsed, @args); |
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23 | |
24 | return $collapsed; |
25 | } |
26 | |
27 | sub unpack { |
98ae09f0 |
28 | my ($class, $data, @args) = @_; |
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29 | |
30 | # check checksum on data |
31 | |
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32 | my $old_checksum = delete $data->{$DIGEST_MARKER}; |
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33 | |
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34 | my $checksum = $class->_digest_packed($data, @args); |
35 | |
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36 | ($checksum eq $old_checksum) |
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37 | || confess "Bad Checksum got=($checksum) expected=($old_checksum)"; |
c4a322ec |
38 | |
39 | my $e = MooseX::Storage::Engine->new(class => $class); |
a6ebb4c8 |
40 | $class->new($e->expand_object($data, @args)); |
c4a322ec |
41 | } |
42 | |
98ae09f0 |
43 | |
44 | sub _digest_packed { |
45 | my ( $self, $collapsed, @args ) = @_; |
46 | |
a6ebb4c8 |
47 | my $d = $self->_digest_object(@args); |
48 | |
a6ebb4c8 |
49 | { |
06a66732 |
50 | local $Data::Dumper::Indent = 0; |
34dcaa5d |
51 | local $Data::Dumper::Sortkeys = 1; |
b7e2e91b |
52 | local $Data::Dumper::Terse = 1; |
53 | local $Data::Dumper::Useqq = 0; |
54 | local $Data::Dumper::Deparse = 0; # FIXME? |
55 | my $str = Data::Dumper::Dumper($collapsed); |
56 | $str =~ s/(?<! ['"] ) \b (\d+) \b (?! ['"] )/'$1'/gx; # canonicalize numbers to strings even if it mangles numbers inside strings |
57 | $d->add( $str ); |
a6ebb4c8 |
58 | } |
59 | |
60 | return $d->hexdigest; |
61 | } |
62 | |
63 | sub _digest_object { |
64 | my ( $self, %options ) = @_; |
65 | my $digest_opts = $options{digest}; |
06a66732 |
66 | |
67 | $digest_opts = [ $digest_opts ] |
68 | if !ref($digest_opts) or ref($digest_opts) ne 'ARRAY'; |
69 | |
a6ebb4c8 |
70 | my ( $d, @args ) = @$digest_opts; |
98ae09f0 |
71 | |
72 | if ( ref $d ) { |
73 | if ( $d->can("clone") ) { |
a6ebb4c8 |
74 | return $d->clone; |
06a66732 |
75 | } |
76 | elsif ( $d->can("reset") ) { |
98ae09f0 |
77 | $d->reset; |
a6ebb4c8 |
78 | return $d; |
06a66732 |
79 | } |
80 | else { |
98ae09f0 |
81 | die "Can't clone or reset digest object: $d"; |
82 | } |
06a66732 |
83 | } |
84 | else { |
a6ebb4c8 |
85 | return Digest->new($d || "SHA1", @args); |
98ae09f0 |
86 | } |
98ae09f0 |
87 | } |
88 | |
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89 | 1; |
90 | |
91 | __END__ |
92 | |
93 | =pod |
94 | |
95 | =head1 NAME |
96 | |
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97 | MooseX::Storage::Base::WithChecksum |
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98 | |
99 | =head1 DESCRIPTION |
100 | |
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101 | This is an early implementation of a more secure Storage role, |
102 | which does integrity checks on the data. It is still being |
103 | developed so I recommend using it with caution. |
104 | |
105 | Any thoughts, ideas or suggestions on improving our technique |
106 | are very welcome. |
107 | |
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108 | =head1 METHODS |
109 | |
110 | =over 4 |
111 | |
112 | =item B<pack (?$salt)> |
113 | |
114 | =item B<unpack ($data, ?$salt)> |
115 | |
116 | =back |
117 | |
118 | =head2 Introspection |
119 | |
120 | =over 4 |
121 | |
122 | =item B<meta> |
123 | |
124 | =back |
125 | |
126 | =head1 BUGS |
127 | |
128 | All complex software has bugs lurking in it, and this module is no |
129 | exception. If you find a bug please either email me, or add the bug |
130 | to cpan-RT. |
131 | |
132 | =head1 AUTHOR |
133 | |
134 | Stevan Little E<lt>stevan.little@iinteractive.comE<gt> |
135 | |
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136 | Yuval Kogman |
137 | |
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138 | =head1 COPYRIGHT AND LICENSE |
139 | |
140 | Copyright 2007 by Infinity Interactive, Inc. |
141 | |
142 | L<http://www.iinteractive.com> |
143 | |
144 | This library is free software; you can redistribute it and/or modify |
145 | it under the same terms as Perl itself. |
146 | |
147 | =cut |