1 | ###########################################################################
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2 | #
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3 | # EmbeddedMetadataPlugin.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 EmbeddedMetadataPlugin;
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29 |
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30 | use BasePlugin;
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31 |
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32 | use Encode;
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33 | use Image::ExifTool qw(:Public);
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34 | use strict;
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35 |
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36 | no strict 'refs'; # allow filehandles to be variables and viceversa
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37 |
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38 |
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39 | sub BEGIN
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40 | {
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41 | @EmbeddedMetadataPlugin::ISA = ('BasePlugin');
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42 | binmode(STDERR, ":utf8");
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43 | }
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44 |
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45 | my $encoding_plus_auto_list =
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46 | [ { 'name' => "auto",
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47 | 'desc' => "{ReadTextFile.input_encoding.auto}" } ];
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48 | push(@{$encoding_plus_auto_list},@{$BasePlugin::encoding_list});
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49 |
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50 | my $arguments =
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51 | [ { 'name' => "metadata_field_separator",
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52 | 'desc' => "{HTMLPlugin.metadata_field_separator}",
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53 | 'type' => "string",
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54 | 'deft' => "" },
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55 | { 'name' => "input_encoding",
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56 | 'desc' => "{ReadTextFile.input_encoding}",
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57 | 'type' => "enum",
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58 | 'list' => $encoding_plus_auto_list,
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59 | 'reqd' => "no",
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60 | 'deft' => "auto" }
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61 | ];
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62 |
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63 |
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64 | my $options = { 'name' => "EmbeddedMetadataPlugin",
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65 | 'desc' => "{EmbeddedMetadataPlugin.desc}",
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66 | 'abstract' => "no",
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67 | 'inherits' => "yes",
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68 | 'args' => $arguments };
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69 |
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70 | sub new()
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71 | {
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72 | my ($class) = shift (@_);
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73 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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74 | push(@$pluginlist, $class);
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75 |
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76 | if(defined $arguments){ push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});}
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77 | if(defined $options) { push(@{$hashArgOptLists->{"OptList"}},$options)};
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78 |
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79 | my $self = new BasePlugin($pluginlist, $inputargs, $hashArgOptLists);
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80 |
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81 |
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82 | # Create a new Image::ExifTool object
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83 | my $exifTool = new Image::ExifTool;
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84 | $exifTool->Options(Duplicates => 0);
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85 | $exifTool->Options(PrintConv => 0);
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86 | $exifTool->Options(Unknown => 1);
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87 | $exifTool->Options('Verbose');
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88 | $self->{'exiftool'} = $exifTool;
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89 |
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90 |
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91 | return bless $self, $class;
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92 | }
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93 |
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94 |
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95 | # Need to think some more about this
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96 | sub get_default_process_exp()
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97 | {
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98 | return ".*";
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99 | #q^(?i)\.(wma|wmv|jpe?g|gif)$^;
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100 | }
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101 |
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102 |
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103 | # This plugin doesn't block any files
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104 | #sub get_default_block_exp()
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105 | #{
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106 | # return '';
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107 | #}
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108 |
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109 |
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110 | sub extractEmbeddedMetadata()
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111 | {
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112 | my $self = shift(@_);
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113 | my ($file, $filename, $extrametadata, $extrametakeys) = @_;
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114 |
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115 | my %exif_metadata = ();
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116 |
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117 | my $verbosity = $self->{'verbosity'};
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118 | my $outhandle = $self->{'outhandle'};
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119 |
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120 | my $metadata_count = 0;
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121 |
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122 | my $separator = $self->{'metadata_field_separator'};
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123 | if ($separator eq "") {
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124 | undef $separator;
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125 | }
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126 |
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127 | my @group_list = Image::ExifTool::GetAllGroups(0);
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128 | foreach my $group (@group_list)
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129 | {
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130 | ## print STDERR "**** group = $group\n";
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131 |
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132 | # Extract meta information from an image
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133 | $self->{'exiftool'}->Options(Group0 => [$group]);
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134 | $self->{'exiftool'}->ExtractInfo($filename);
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135 |
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136 | # Get list of tags in the order they were found in the file
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137 | my @tag_list = $self->{'exiftool'}->GetFoundTags('File');
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138 | foreach my $tag (@tag_list)
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139 | {
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140 | ### print STDERR "**** tag = $tag\n";
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141 |
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142 | # Strip any numbering suffix
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143 | $tag =~ s/^([^\s]+)\s.*$/$1/i;
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144 | my $value = $self->{'exiftool'}->GetValue($tag);
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145 | if (defined $value && $value =~ /[a-z0-9]+/i) {
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146 |
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147 | my $field = "ex.$group.$tag";
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148 |
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149 | my $encoding = $self->{'input_encoding'};
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150 | if($encoding eq "auto")
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151 | {
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152 | $encoding = "utf8"
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153 | }
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154 |
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155 |
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156 |
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157 | if (!defined $exif_metadata{$field})
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158 | {
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159 | $exif_metadata{$field} = [];
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160 | }
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161 |
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162 | $field = Encode::decode($encoding,$field);
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163 | my $metadata_done = 0;
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164 | if (ref $value eq 'SCALAR') {
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165 |
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166 | if ($$value =~ /^Binary data/) {
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167 |
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168 | $value = "($$value)";
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169 | }
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170 | else {
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171 |
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172 | my $len = length($$value);
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173 | $value = "(Binary data $len bytes)";
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174 | }
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175 | }
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176 | elsif (ref $value eq 'ARRAY') {
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177 | $metadata_done = 1;
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178 | foreach my $v (@$value) {
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179 | $v = Encode::decode($encoding,$v);
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180 | push (@{$exif_metadata{$field}}, $self->gsSafe($v));
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181 | ++$metadata_count;
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182 | }
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183 | }
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184 | else {
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185 | $value = Encode::decode($encoding,$value);
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186 | if (defined $separator) {
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187 | my @vs = split($separator, $value);
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188 | $metadata_done = 1;
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189 | foreach my $v (@vs) {
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190 | if ($v =~ /\S/) {
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191 | push (@{$exif_metadata{$field}}, $self->gsSafe($v));
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192 | ++$metadata_count;
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193 | }
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194 | }
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195 | }
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196 | }
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197 | if (!$metadata_done) {
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198 | push (@{$exif_metadata{$field}}, $self->gsSafe($value));
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199 | ++$metadata_count;
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200 | }
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201 | }
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202 | }
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203 | }
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204 |
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205 |
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206 | if ($metadata_count > 0) {
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207 | print $outhandle " Extracted $metadata_count pieces of metadata from $filename EXIF block\n";
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208 | }
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209 |
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210 | # Protect windows directory chars \
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211 | $file = &util::filename_to_regex($file);
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212 |
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213 | # Associate the metadata now
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214 |
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215 | $extrametadata->{$file} = \%exif_metadata;
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216 | push(@$extrametakeys, $file);
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217 |
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218 | }
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219 |
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220 |
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221 | sub metadata_read()
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222 | {
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223 | my $self = shift (@_);
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224 | my ($pluginfo, $base_dir, $file, $block_hash,
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225 | $extrametakeys, $extrametadata, $extrametafile,
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226 | $processor, $gli, $aux) = @_;
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227 |
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228 | my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);
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229 |
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230 | # we don't want to process directories
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231 | if (!-f $filename_full_path || !$self->can_process_this_file($filename_full_path)) {
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232 | return undef;
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233 | }
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234 | print STDERR "\n<Processing n='$file' p='EmbeddedMetadataPlugin'>\n" if ($gli);
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235 | print STDERR "EmbeddedMetadataPlugin: processing $file\n" if ($self->{'verbosity'}) > 1;
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236 |
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237 |
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238 | $self->extractEmbeddedMetadata($filename_no_path,$filename_full_path,
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239 | $extrametadata,$extrametakeys);
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240 |
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241 |
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242 | return undef;
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243 | }
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244 |
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245 |
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246 | sub process()
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247 | {
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248 | # not used
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249 | return undef;
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250 | }
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251 |
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252 | sub gsSafe()
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253 | {
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254 | my $self = shift(@_);
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255 | my ($text) = @_;
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256 | # Replace dangerous characters
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257 | $text =~ s/\(/(/g;
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258 | $text =~ s/\)/)/g;
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259 | $text =~ s/,/,/g;
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260 | $text =~ s/\</</g;
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261 | $text =~ s/\</>/g;
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262 | $text =~ s/\[/[/g;
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263 | $text =~ s/\]/]/g;
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264 | # Done
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265 | return $text;
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266 | }
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267 |
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268 | 1;
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