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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50 | 'desc' => "{MetadataBasPlug.desc}",
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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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