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 | |
69b45b7d |
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 | |
a6ebb4c8 |
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; |
34dcaa5d |
52 | $d->add( Data::Dumper::Dumper($collapsed) ); |
a6ebb4c8 |
53 | } |
54 | |
55 | return $d->hexdigest; |
56 | } |
57 | |
58 | sub _digest_object { |
59 | my ( $self, %options ) = @_; |
60 | my $digest_opts = $options{digest}; |
06a66732 |
61 | |
62 | $digest_opts = [ $digest_opts ] |
63 | if !ref($digest_opts) or ref($digest_opts) ne 'ARRAY'; |
64 | |
a6ebb4c8 |
65 | my ( $d, @args ) = @$digest_opts; |
98ae09f0 |
66 | |
67 | if ( ref $d ) { |
68 | if ( $d->can("clone") ) { |
a6ebb4c8 |
69 | return $d->clone; |
06a66732 |
70 | } |
71 | elsif ( $d->can("reset") ) { |
98ae09f0 |
72 | $d->reset; |
a6ebb4c8 |
73 | return $d; |
06a66732 |
74 | } |
75 | else { |
98ae09f0 |
76 | die "Can't clone or reset digest object: $d"; |
77 | } |
06a66732 |
78 | } |
79 | else { |
a6ebb4c8 |
80 | return Digest->new($d || "SHA1", @args); |
98ae09f0 |
81 | } |
98ae09f0 |
82 | } |
83 | |
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84 | 1; |
85 | |
86 | __END__ |
87 | |
88 | =pod |
89 | |
90 | =head1 NAME |
91 | |
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92 | MooseX::Storage::Base::WithChecksum |
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93 | |
94 | =head1 DESCRIPTION |
95 | |
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96 | This is an early implementation of a more secure Storage role, |
97 | which does integrity checks on the data. It is still being |
98 | developed so I recommend using it with caution. |
99 | |
100 | Any thoughts, ideas or suggestions on improving our technique |
101 | are very welcome. |
102 | |
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103 | =head1 METHODS |
104 | |
105 | =over 4 |
106 | |
107 | =item B<pack (?$salt)> |
108 | |
109 | =item B<unpack ($data, ?$salt)> |
110 | |
111 | =back |
112 | |
113 | =head2 Introspection |
114 | |
115 | =over 4 |
116 | |
117 | =item B<meta> |
118 | |
119 | =back |
120 | |
121 | =head1 BUGS |
122 | |
123 | All complex software has bugs lurking in it, and this module is no |
124 | exception. If you find a bug please either email me, or add the bug |
125 | to cpan-RT. |
126 | |
127 | =head1 AUTHOR |
128 | |
129 | Stevan Little E<lt>stevan.little@iinteractive.comE<gt> |
130 | |
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131 | Yuval Kogman |
132 | |
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133 | =head1 COPYRIGHT AND LICENSE |
134 | |
135 | Copyright 2007 by Infinity Interactive, Inc. |
136 | |
137 | L<http://www.iinteractive.com> |
138 | |
139 | This library is free software; you can redistribute it and/or modify |
140 | it under the same terms as Perl itself. |
141 | |
142 | =cut |