1 | ###########################################################################
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2 | #
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3 | # RecPlug.pm --
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4 | # A component of the Greenstone digital library software
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5 | # from the New Zealand Digital Library Project at the
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6 | # University of Waikato, New Zealand.
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7 | #
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8 | # Copyright (C) 1999 New Zealand Digital Library Project
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9 | #
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10 | # This program is free software; you can redistribute it and/or modify
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11 | # it under the terms of the GNU General Public License as published by
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12 | # the Free Software Foundation; either version 2 of the License, or
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13 | # (at your option) any later version.
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14 | #
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15 | # This program is distributed in the hope that it will be useful,
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16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | # GNU General Public License for more details.
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19 | #
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20 | # You should have received a copy of the GNU General Public License
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21 | # along with this program; if not, write to the Free Software
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22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | #
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24 | ###########################################################################
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25 |
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26 | # RecPlug is a plugin which recurses through directories processing
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27 | # each file it finds.
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28 |
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29 | # RecPlug has one option: use_metadata_files. When this is set, it will
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30 | # check each directory for an XML file called "metadata.xml" that specifies
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31 | # metadata for the files (and subdirectories) in the directory.
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32 | #
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33 | # Here's an example of a metadata file that uses three FileSet structures
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34 | # (ignore the # characters):
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35 |
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36 | #<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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37 | #<!DOCTYPE DirectoryMetadata SYSTEM "http://greenstone.org/dtd/DirectoryMetadata/1.0/DirectoryMetadata.dtd">
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38 | #<DirectoryMetadata>
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39 | # <FileSet>
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40 | # <FileName>nugget.*</FileName>
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41 | # <Description>
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42 | # <Metadata name="Title">Nugget Point, The Catlins</Metadata>
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43 | # <Metadata name="Place" mode="accumulate">Nugget Point</Metadata>
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44 | # </Description>
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45 | # </FileSet>
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46 | # <FileSet>
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47 | # <FileName>nugget-point-1.jpg</FileName>
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48 | # <Description>
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49 | # <Metadata name="Title">Nugget Point Lighthouse, The Catlins</Metadata>
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50 | # <Metadata name="Subject">Lighthouse</Metadata>
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51 | # </Description>
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52 | # </FileSet>
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53 | # <FileSet>
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54 | # <FileName>kaka-point-dir</FileName>
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55 | # <Description>
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56 | # <Metadata name="Title">Kaka Point, The Catlins</Metadata>
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57 | # </Description>
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58 | # </FileSet>
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59 | #</DirectoryMetadata>
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60 |
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61 | # Metadata elements are read and applied to files in the order they appear
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62 | # in the file.
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63 | #
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64 | # The FileName element describes the subfiles in the directory that the
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65 | # metadata applies to as a perl regular expression (a FileSet group may
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66 | # contain multiple FileName elements). So, <FileName>nugget.*</FileName>
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67 | # indicates that the metadata records in the following Description block
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68 | # apply to every subfile that starts with "nugget". For these files, a
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69 | # Title metadata element is set, overriding any old value that the Title
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70 | # might have had.
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71 | #
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72 | # Occasionally, we want to have multiple metadata values applied to a
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73 | # document; in this case we use the "mode=accumulate" attribute of the
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74 | # particular Metadata element. In the second metadata element of the first
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75 | # FileSet above, the "Place" metadata is accumulating, and may therefore be
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76 | # given several values. If we wanted to override these values and use a
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77 | # single metadata element again, we could set the mode attribute to
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78 | # "override" instead. Remember: every element is assumed to be in override
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79 | # mode unless you specify otherwise, so if you want to accumulate metadata
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80 | # for some field, every occurance must have "mode=accumulate" specified.
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81 | #
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82 | # The second FileSet element above applies to a specific file, called
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83 | # nugget-point-1.jpg. This element overrides the Title metadata set in the
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84 | # first FileSet, and adds a "Subject" metadata field.
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85 | #
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86 | # The third and final FileSet sets metadata for a subdirectory rather than
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87 | # a file. The metadata specified (a Title) will be passed into the
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88 | # subdirectory and applied to every file that occurs in the subdirectory
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89 | # (and to every subsubdirectory and its contents, and so on) unless the
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90 | # metadata is explictly overridden later in the import.
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91 |
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92 |
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93 |
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94 | package RecPlug;
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95 |
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96 | use BasPlug;
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97 | use plugin;
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98 | use util;
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99 |
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100 |
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101 | BEGIN {
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102 | @ISA = ('BasPlug');
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103 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/cpan");
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104 | }
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105 |
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106 | use XML::Parser;
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107 |
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108 | sub print_usage {
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109 | my ($plugin_name) = @_;
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110 |
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111 | print STDERR "
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112 | usage: plugin RecPlug [options]
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113 |
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114 | -use_metadata_files Read metadata from metadata XML files.
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115 |
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116 | "
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117 | }
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118 |
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119 | my ($self);
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120 | sub new {
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121 | my $class = shift (@_);
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122 |
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123 | # $self is global for use within subroutines called by XML::Parser
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124 | $self = new BasPlug ($class, @_);
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125 |
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126 | if (!parsargv::parse(\@_,
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127 | q^use_metadata_files^, \$self->{'use_metadata_files'},
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128 | "allow_extra_options")) {
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129 | print STDERR "\nRecPlug uses an incorrect option.\n";
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130 | print STDERR "Check your collect.cfg configuration file.\n\n";
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131 | &print_usage("RecPlug");
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132 | die "\n";
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133 | }
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134 |
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135 | if ($self->{'use_metadata_files'}) {
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136 | # create XML::Parser object for parsing metadata.xml files
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137 | my $parser = new XML::Parser('Style' => 'Stream',
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138 | 'Handlers' => {'Char' => \&Char,
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139 | 'Doctype' => \&Doctype
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140 | });
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141 | $self->{'parser'} = $parser;
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142 | $self->{'in_filename'} = 0;
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143 |
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144 | }
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145 |
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146 | return bless $self, $class;
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147 | }
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148 |
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149 | # return 1 if this class might recurse using $pluginfo
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150 | sub is_recursive {
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151 | my $self = shift (@_);
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152 |
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153 | return 1;
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154 | }
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155 |
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156 | sub get_default_block_exp {
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157 | my $self = shift (@_);
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158 |
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159 | return 'CVS';
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160 | }
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161 |
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162 | # return number of files processed, undef if can't process
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163 | # Note that $base_dir might be "" and that $file might
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164 | # include directories
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165 |
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166 | # This function passes around metadata hash structures. Metadata hash
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167 | # structures are hashes that map from a (scalar) key (the metadata element
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168 | # name) to either a scalar metadata value or a reference to an array of
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169 | # such values.
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170 |
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171 | sub read {
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172 | my $self = shift (@_);
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173 | my ($pluginfo, $base_dir, $file, $in_metadata, $processor, $maxdocs) = @_;
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174 |
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175 | my $outhandle = $self->{'outhandle'};
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176 | my $verbosity = $self->{'verbosity'};
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177 | my $read_metadata_files = $self->{'use_metadata_files'};
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178 |
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179 | # Calculate the directory name and ensure it is a directory and
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180 | # that it is not explicitly blocked.
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181 | my $dirname = $file;
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182 | $dirname = &util::filename_cat ($base_dir, $file) if $base_dir =~ /\w/;
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183 | return undef unless (-d $dirname);
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184 | return 0 if ($self->{'block_exp'} ne "" && $dirname =~ /$self->{'block_exp'}/);
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185 |
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186 | # check to make sure we're not reading the archives or index directory
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187 | my $gsdlhome = quotemeta($ENV{'GSDLHOME'});
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188 | if ($dirname =~ m/^$gsdlhome\/.*?\/import.*?\/(archives|index)$/) {
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189 | print $outhandle "RecPlug: $dirname appears to be a reference to a Greenstone collection, skipping.\n";
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190 | return 0;
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191 | }
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192 |
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193 | # check to see we haven't got a cyclic path...
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194 | if ($dirname =~ m%(/.*){,41}%) {
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195 | print $outhandle "RecPlug: $dirname is 40 directories deep, is this a recursive path? if not increase constant in RecPlug.pm.\n";
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196 | return 0;
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197 | }
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198 |
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199 | # check to see we haven't got a cyclic path...
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200 | if ($dirname =~ m%.*?import/(.+?)/import/\1.*%) {
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201 | print $outhandle "RecPlug: $dirname appears to be in a recursive loop...\n";
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202 | return 0;
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203 | }
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204 |
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205 | if (($verbosity > 2) && ((scalar keys %$in_metadata) > 0)) {
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206 | print $outhandle "RecPlug: metadata passed in: ",
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207 | join(", ", keys %$in_metadata), "\n";
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208 | }
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209 |
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210 | # Recur over directory contents.
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211 | my (@dir, $subfile);
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212 | my $count = 0;
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213 | print $outhandle "RecPlug: getting directory $dirname\n" if ($verbosity);
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214 |
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215 | # find all the files in the directory
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216 | if (!opendir (DIR, $dirname)) {
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217 | print $outhandle "RecPlug: WARNING - couldn't read directory $dirname\n";
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218 | return undef;
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219 | }
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220 | @dir = readdir (DIR);
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221 | closedir (DIR);
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222 |
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223 | # read XML metadata files (if supplied)
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224 | my $additionalmetadata = 0; # is there extra metadata available?
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225 | my %extrametadata; # maps from filespec to extra metadata keys
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226 | my @extrametakeys; # keys of %extrametadata in order read
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227 |
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228 | if ($read_metadata_files) {
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229 |
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230 | # read the directory "metadata.xml" file
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231 | my $metadatafile = &util::filename_cat ($dirname, 'metadata.xml');
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232 | if (-e $metadatafile) {
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233 | print $outhandle "RecPlug: found metadata in $metadatafile\n"
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234 | if ($verbosity);
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235 | $self->read_metadata_xml_file($metadatafile, \%extrametadata, \@extrametakeys);
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236 | $additionalmetadata = 1;
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237 | }
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238 | }
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239 |
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240 | # import each of the files in the directory
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241 | my $out_metadata;
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242 | foreach $subfile (@dir) {
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243 |
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244 | last if ($maxdocs != -1 && $count >= $maxdocs);
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245 | next if ($subfile =~ /^\.\.?$/);
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246 | next if ($read_metadata_files && $subfile =~ /metadata\.xml$/);
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247 |
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248 | # check for a symlink pointing back to a leading directory
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249 | if (-d "$dirname/$subfile" && -l "$dirname/$subfile") {
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250 | # readlink gives a "fatal error" on systems that don't implement
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251 | # symlinks. This assumes the the -l test above would fail on those.
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252 | my $linkdest=readlink "$dirname/$subfile";
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253 | if (!defined ($linkdest)) {
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254 | # system error - file not found?
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255 | warn "RecPlug: symlink problem - $!";
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256 | } else {
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257 | # see if link points to current or a parent directory
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258 | if ($linkdest =~ m@^[\./\\]+$@ ||
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259 | index($dirname, $linkdest) != -1) {
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260 | warn "RecPlug: Ignoring recursive symlink ($dirname/$subfile -> $linkdest)\n";
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261 | next;
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262 | ;
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263 | }
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264 | }
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265 | }
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266 |
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267 | print $outhandle "RecPlug: preparing metadata for $subfile\n" if ($verbosity > 2);
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268 |
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269 | # Make a copy of $in_metadata to pass to $subfile
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270 | $out_metadata = {};
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271 | &combine_metadata_structures($out_metadata, $in_metadata);
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272 |
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273 | # Next add metadata read in XML files (if it is supplied)
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274 | if ($additionalmetadata == 1) {
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275 |
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276 | my ($filespec, $mdref);
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277 | foreach $filespec (@extrametakeys) {
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278 | if ($subfile =~ /^$filespec$/) {
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279 | print $outhandle "File \"$subfile\" matches filespec \"$filespec\"\n"
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280 | if ($verbosity > 2);
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281 | $mdref = $extrametadata{$filespec};
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282 | &combine_metadata_structures($out_metadata, $mdref);
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283 | }
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284 | }
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285 | }
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286 |
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287 | # Recursively read each $subfile
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288 | print $outhandle "RecPlug recurring: $subfile\n" if ($verbosity > 2);
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289 | $count += &plugin::read ($pluginfo, $base_dir,
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290 | &util::filename_cat($file, $subfile),
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291 | $out_metadata, $processor, $maxdocs);
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292 | }
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293 | return $count;
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294 |
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295 | }
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296 |
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297 |
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298 |
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299 | # Read a manually-constructed metadata file and store the data
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300 | # it contains in the $metadataref structure.
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301 | #
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302 | # (metadataref is a reference to a hash whose keys are filenames
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303 | # and whose values are metadata hash structures.)
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304 |
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305 | sub read_metadata_xml_file {
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306 | my $self = shift(@_);
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307 | my ($filename, $metadataref, $metakeysref) = @_;
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308 | $self->{'metadataref'} = $metadataref;
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309 | $self->{'metakeysref'} = $metakeysref;
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310 |
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311 | eval {
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312 | $self->{'parser'}->parsefile($filename);
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313 | };
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314 | if ($@) {
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315 | die "RecPlug: ERROR $filename is not a well formed metadata.xml file ($@)\n";
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316 | }
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317 | }
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318 |
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319 | sub Doctype {
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320 | my ($expat, $name, $sysid, $pubid, $internal) = @_;
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321 |
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322 | # allow the short-lived and badly named "GreenstoneDirectoryMetadata" files
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323 | # to be processed as well as the "DirectoryMetadata" files which should now
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324 | # be created by import.pl
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325 | die if ($name !~ /^(Greenstone)?DirectoryMetadata$/);
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326 | }
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327 |
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328 | sub StartTag {
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329 | my ($expat, $element) = @_;
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330 |
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331 | if ($element eq "FileSet") {
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332 | $self->{'saved_targets'} = [];
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333 | $self->{'saved_metadata'} = {};
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334 | }
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335 | elsif ($element eq "FileName") {
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336 | $self->{'in_filename'} = 1;
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337 | }
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338 | elsif ($element eq "Metadata") {
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339 | $self->{'metadata_name'} = $_{'name'};
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340 | if ((defined $_{'mode'}) && ($_{'mode'} eq "accumulate")) {
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341 | $self->{'metadata_accumulate'} = 1;
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342 | } else {
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343 | $self->{'metadata_accumulate'} = 0;
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344 | }
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345 | }
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346 | }
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347 |
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348 | sub EndTag {
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349 | my ($expat, $element) = @_;
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350 |
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351 | if ($element eq "FileSet") {
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352 | push (@{$self->{'metakeysref'}}, @{$self->{'saved_targets'}});
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353 | foreach my $target (@{$self->{'saved_targets'}}) {
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354 | $self->{'metadataref'}->{$target} = $self->{'saved_metadata'};
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355 | }
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356 | }
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357 | elsif ($element eq "FileName") {
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358 | $self->{'in_filename'} = 0;
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359 | }
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360 | elsif ($element eq "Metadata") {
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361 | $self->{'metadata_name'} = "";
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362 | }
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363 |
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364 | }
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365 |
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366 | sub Text {
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367 |
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368 | if ($self->{'in_filename'}) {
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369 | # $_ == FileName content
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370 | push (@{$self->{'saved_targets'}}, $_);
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371 | }
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372 | elsif (defined ($self->{'metadata_name'}) && $self->{'metadata_name'} ne "") {
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373 | # $_ == Metadata content
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374 | my $mname = $self->{'metadata_name'};
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375 | if (defined $self->{'saved_metadata'}->{$mname}) {
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376 | if ($self->{'metadata_accumulate'}) {
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377 | # accumulate mode - add value to existing value(s)
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378 | if (ref ($self->{'saved_metadata'}->{$mname}) eq "ARRAY") {
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379 | push (@{$self->{'saved_metadata'}->{$mname}}, $_);
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380 | } else {
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381 | $self->{'saved_metadata'}->{$mname} =
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382 | [$self->{'saved_metadata'}->{$mname}, $_];
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383 | }
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384 | } else {
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385 | # override mode
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386 | $self->{'saved_metadata'}->{$mname} = $_;
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387 | }
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388 | } else {
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389 | if ($self->{'metadata_accumulate'}) {
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390 | # accumulate mode - add value into (currently empty) array
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391 | $self->{'saved_metadata'}->{$mname} = [$_];
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392 | } else {
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393 | # override mode
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394 | $self->{'saved_metadata'}->{$mname} = $_;
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395 | }
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396 | }
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397 | }
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398 | }
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399 |
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400 | # This Char function overrides the one in XML::Parser::Stream to overcome a
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401 | # problem where $expat->{Text} is treated as the return value, slowing
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402 | # things down significantly in some cases.
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403 | sub Char {
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404 | $_[0]->{'Text'} .= $_[1];
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405 | return undef;
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406 | }
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407 |
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408 | # Combine two metadata structures. Given two references to metadata
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409 | # element structures, add every field of the second ($mdref2) to the first
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410 | # ($mdref1).
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411 | #
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412 | # Afterwards $mdref1 will be updated, and $mdref2 will be unchanged.
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413 | #
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414 | # We have to be acreful about the way we merge metadata when one metadata
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415 | # structure is in "override" mode and one is in "merge" mode. In fact, we
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416 | # use the mode from the second structure, $mdref2, because it is generally
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417 | # defined later (lower in the directory structure) and is therefore more
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418 | # "local" to the document concerned.
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419 | #
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420 | # Another issue is the use of references to pass metadata around. If we
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421 | # simply copy one metadata structure reference to another, then we're
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422 | # effectively justr copyinga pointer, and changes to the new referene
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423 | # will affect the old (copied) one also. This also applies to ARRAY
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424 | # references used as metadata element values (hence the "clonedata"
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425 | # function below).
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426 |
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427 | sub combine_metadata_structures {
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428 | my ($mdref1, $mdref2) = @_;
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429 | my ($key, $value1, $value2);
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430 |
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431 | foreach $key (keys %$mdref2) {
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432 |
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433 | $value1 = $mdref1->{$key};
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434 | $value2 = $mdref2->{$key};
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435 |
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436 | # If there is no existing value for this metadata field in
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437 | # $mdref1, so we simply copy the value from $mdref2 over.
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438 | if (!defined $value1) {
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439 | $mdref1->{$key} = &clonedata($value2);
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440 | }
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441 | # Otherwise we have to add the new values to the existing ones.
|
---|
442 | # If the second structure is accumulated, then acculate all the
|
---|
443 | # values into the first structure
|
---|
444 | elsif ((ref $value2) eq "ARRAY") {
|
---|
445 | # If the first metadata element is a scalar we have to
|
---|
446 | # convert it into an array before we add anything more.
|
---|
447 | if ((ref $value1) ne 'ARRAY') {
|
---|
448 | $mdref1->{$key} = [$value1];
|
---|
449 | $value1 = $mdref1->{$key};
|
---|
450 | }
|
---|
451 | # Now add the value(s) from the second array to the first
|
---|
452 | $value2 = &clonedata($value2);
|
---|
453 | push @$value1, @$value2;
|
---|
454 | }
|
---|
455 | # Finally, If the second structure is not an array erference, we
|
---|
456 | # know it is in override mode, so override the first structure.
|
---|
457 | else {
|
---|
458 | $mdref1->{$key} = &clonedata($value2);
|
---|
459 | }
|
---|
460 | }
|
---|
461 | }
|
---|
462 |
|
---|
463 |
|
---|
464 | # Make a "cloned" copy of a metadata value.
|
---|
465 | # This is trivial for a simple scalar value,
|
---|
466 | # but not for an array reference.
|
---|
467 |
|
---|
468 | sub clonedata {
|
---|
469 | my ($value) = @_;
|
---|
470 | my $result;
|
---|
471 |
|
---|
472 | if ((ref $value) eq 'ARRAY') {
|
---|
473 | $result = [];
|
---|
474 | foreach my $item (@$value) {
|
---|
475 | push @$result, $item;
|
---|
476 | }
|
---|
477 | } else {
|
---|
478 | $result = $value;
|
---|
479 | }
|
---|
480 | return $result;
|
---|
481 | }
|
---|
482 |
|
---|
483 |
|
---|
484 | 1;
|
---|