[18516] | 1 | ###########################################################################
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| 2 | #
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| 3 | # MetadataEXIFPlugin.pm -- A plugin for EXIF
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| 4 | #
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| 5 | # A component of the Greenstone digital library software
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| 6 | # from the New Zealand Digital Library Project at the
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| 7 | # University of Waikato, New Zealand.
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| 8 | #
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| 9 | # Copyright 2007 New Zealand Digital Library Project
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| 10 | #
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| 11 | # This program is free software; you can redistribute it and/or modify
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| 12 | # it under the terms of the GNU General Public License as published by
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| 13 | # the Free Software Foundation; either version 2 of the License, or
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| 14 | # (at your option) any later version.
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| 15 | #
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| 16 | # This program is distributed in the hope that it will be useful,
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| 17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | # GNU General Public License for more details.
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| 20 | #
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| 21 | # You should have received a copy of the GNU General Public License
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| 22 | # along with this program; if not, write to the Free Software
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| 23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 24 | #
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| 25 | ###########################################################################
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| 26 |
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| 27 |
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| 28 | package MetadataEXIFPlugin;
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| 29 |
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| 30 | use BasePlugin;
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| 31 |
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| 32 | use Image::ExifTool qw(:Public);
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| 33 | use strict;
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| 34 |
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| 35 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 36 |
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| 37 |
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| 38 | sub BEGIN
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| 39 | {
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| 40 | @MetadataEXIFPlugin::ISA = ('BasePlugin');
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| 41 | }
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| 42 |
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| 43 |
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| 44 |
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| 45 | my $arguments =
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| 46 | [ ];
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| 47 |
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| 48 |
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| 49 | my $options = { 'name' => "MetadataEXIFPlugin",
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[19215] | 50 | 'desc' => "{MetadataEXIFPlugin.desc}",
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[18516] | 51 | 'abstract' => "no",
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| 52 | 'inherits' => "yes",
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| 53 | 'args' => $arguments };
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| 54 |
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| 55 | sub new()
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| 56 | {
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| 57 | my ($class) = shift (@_);
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| 58 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 59 | push(@$pluginlist, $class);
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| 60 |
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| 61 | if(defined $arguments){ push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});}
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| 62 | if(defined $options) { push(@{$hashArgOptLists->{"OptList"}},$options)};
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| 63 |
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| 64 | my $self = new BasePlugin($pluginlist, $inputargs, $hashArgOptLists);
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| 65 |
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| 66 |
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| 67 | # Create a new Image::ExifTool object
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| 68 | my $exifTool = new Image::ExifTool;
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| 69 | $exifTool->Options(Duplicates => 0);
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| 70 | $exifTool->Options(PrintConv => 0);
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| 71 | $exifTool->Options(Unknown => 1);
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| 72 | $exifTool->Options('Verbose');
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| 73 | $self->{'exiftool'} = $exifTool;
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| 74 |
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| 75 |
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| 76 | return bless $self, $class;
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| 77 | }
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| 78 |
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| 79 |
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| 80 | # Need to think some more about this
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| 81 | sub get_default_process_exp()
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| 82 | {
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| 83 | return q^(?i)\.(wma|wmv|jpe?g|gif)$^;
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| 84 | }
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| 85 |
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| 86 |
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| 87 | # This plugin doesn't block any files
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| 88 | sub get_default_block_exp()
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| 89 | {
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| 90 | return '';
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| 91 | }
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| 92 |
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| 93 |
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| 94 | sub extractEmbeddedMetadata()
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| 95 | {
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| 96 | my $self = shift(@_);
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| 97 | my ($file, $filename, $extrametadata, $extrametakeys) = @_;
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| 98 |
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| 99 | my %exif_metadata = ();
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| 100 |
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| 101 | my $verbosity = $self->{'verbosity'};
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| 102 | my $outhandle = $self->{'outhandle'};
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| 103 |
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| 104 | my $metadata_count = 0;
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| 105 |
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| 106 | my @group_list = Image::ExifTool::GetAllGroups(0);
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| 107 | foreach my $group (@group_list)
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| 108 | {
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| 109 | ## print STDERR "**** group = $group\n";
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| 110 |
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| 111 | # Extract meta information from an image
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| 112 | $self->{'exiftool'}->Options(Group0 => [$group]);
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| 113 | $self->{'exiftool'}->ExtractInfo($filename);
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| 114 |
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| 115 | # Get list of tags in the order they were found in the file
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| 116 | my @tag_list = $self->{'exiftool'}->GetFoundTags('File');
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| 117 | foreach my $tag (@tag_list)
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| 118 | {
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| 119 | ### print STDERR "**** tag = $tag\n";
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| 120 |
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| 121 | # Strip any numbering suffix
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| 122 | $tag =~ s/^([^\s]+)\s.*$/$1/i;
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| 123 | my $value = $self->{'exiftool'}->GetValue($tag);
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| 124 | if (defined $value && $value =~ /[a-z0-9]+/i)
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| 125 | {
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| 126 | if (ref $value eq 'SCALAR')
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| 127 | {
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| 128 | if ($$value =~ /^Binary data/)
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| 129 | {
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| 130 | $value = "($$value)";
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| 131 | }
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| 132 | else
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| 133 | {
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| 134 | my $len = length($$value);
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| 135 | $value = "(Binary data $len bytes)";
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| 136 | }
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| 137 | }
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| 138 |
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| 139 | my $field = "$group.$tag";
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| 140 |
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| 141 | if (!defined $exif_metadata{$field})
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| 142 | {
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| 143 | $exif_metadata{$field} = [];
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| 144 | }
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| 145 | push (@{$exif_metadata{$field}}, $self->gsSafe($value));
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| 146 | ## print STDERR "**** adding $field: $value\n";
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| 147 |
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| 148 | ++$metadata_count;
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| 149 | }
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| 150 | }
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| 151 | }
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| 152 |
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| 153 |
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| 154 | if ($metadata_count > 0) {
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| 155 | print $outhandle " Extracted $metadata_count pieces of metadata from $filename EXIF block\n";
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| 156 | }
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| 157 |
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| 158 | # Associate the metadata now
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| 159 | ## print STDERR "**** file = $file\n";
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| 160 |
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| 161 | $extrametadata->{$file} = \%exif_metadata;
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| 162 | push(@$extrametakeys, $file);
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| 163 |
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| 164 | }
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| 165 |
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| 166 |
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| 167 | sub metadata_read()
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| 168 | {
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| 169 | my $self = shift (@_);
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| 170 | my ($pluginfo, $base_dir, $file, $block_hash, $extrametakeys, $extrametadata, $processor, $maxdocs, $gli) = @_;
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| 171 |
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| 172 |
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| 173 |
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| 174 | # See if we are looking at a PDF file... which may contain EXIF
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| 175 | my $filename = &util::filename_cat($base_dir, $file);
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| 176 | # if ($filename !~ /\.pdf$/i || !-f $filename)
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| 177 | # {
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| 178 | # return undef;
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| 179 | # }
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| 180 |
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| 181 | print STDERR "\n<Processing n='$file' p='MetadataEXIFPlugin'>\n" if ($gli);
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| 182 | print STDERR "MetadataEXIFPlugin: processing $file\n" if ($self->{'verbosity'}) > 1;
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| 183 |
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| 184 |
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| 185 | $self->extractEmbeddedMetadata($file,$filename,
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| 186 | $extrametadata,$extrametakeys);
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| 187 |
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| 188 |
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| 189 | return undef;
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| 190 | }
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| 191 |
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| 192 |
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| 193 | sub process()
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| 194 | {
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| 195 | # not used
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| 196 | return undef;
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| 197 | }
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| 198 |
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| 199 | sub gsSafe()
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| 200 | {
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| 201 | my $self = shift(@_);
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| 202 | my ($text) = @_;
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| 203 | # Replace dangerous characters
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| 204 | $text =~ s/\(/(/g;
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| 205 | $text =~ s/\)/)/g;
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| 206 | $text =~ s/,/,/g;
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| 207 | $text =~ s/\</</g;
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| 208 | $text =~ s/\</>/g;
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| 209 | $text =~ s/\[/[/g;
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| 210 | $text =~ s/\]/]/g;
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| 211 | # Done
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| 212 | return $text;
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| 213 | }
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| 214 |
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| 215 | 1;
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