1 | ###########################################################################
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2 | #
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3 | # OAIPlug.pm -- basic Open Archives Initiative (OAI) plugin
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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 (C) 1999 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 | package OAIPlugin;
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28 |
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29 | use unicode;
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30 | use util;
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31 |
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32 | use strict;
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33 | no strict 'refs'; # allow filehandles to be variables and viceversa
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34 |
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35 | use ReadXMLFile;
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36 | use ReadTextFile; # needed for subroutine textcat_get_language_encoding
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37 | use metadatautil;
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38 | use MetadataRead;
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39 |
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40 | # methods with identical signatures take precedence in the order given in the ISA list.
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41 | sub BEGIN {
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42 | @OAIPlugin::ISA = ('MetadataRead', 'ReadXMLFile', 'ReadTextFile');
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43 | }
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44 |
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45 | my $set_list =
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46 | [ { 'name' => "auto",
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47 | 'desc' => "{OAIPlugin.metadata_set.auto}" },
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48 | { 'name' => "dc",
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49 | 'desc' => "{OAIPlugin.metadata_set.dc}" }
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50 | ];
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51 |
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52 | my $arguments =
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53 | [ { 'name' => "process_exp",
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54 | 'desc' => "{BasePlugin.process_exp}",
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55 | 'type' => "regexp",
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56 | 'reqd' => "no",
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57 | 'deft' => &get_default_process_exp() },
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58 | { 'name' => "metadata_set",
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59 | 'desc' => "{OAIPlugin.metadata_set}",
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60 | 'type' => "enumstring",
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61 | 'reqd' => "no",
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62 | 'list' => $set_list,
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63 | 'deft' => "dc" },
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64 | { 'name' => "document_field",
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65 | 'desc' => "{OAIPlugin.document_field}",
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66 | 'type' => "metadata",
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67 | 'reqd' => "no",
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68 | 'deft' => "gi.Sourcedoc" }
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69 | ];
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70 |
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71 | my $options = { 'name' => "OAIPlugin",
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72 | 'desc' => "{OAIPlugin.desc}",
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73 | 'abstract' => "no",
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74 | 'inherits' => "yes",
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75 | 'explodes' => "yes",
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76 | 'args' => $arguments };
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77 |
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78 |
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79 | sub new {
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80 | my ($class) = shift (@_);
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81 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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82 | push(@$pluginlist, $class);
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83 |
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84 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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85 | push(@{$hashArgOptLists->{"OptList"}},$options);
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86 |
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87 | new ReadTextFile($pluginlist, $inputargs, $hashArgOptLists,1);
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88 | my $self = new ReadXMLFile($pluginlist, $inputargs, $hashArgOptLists);
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89 |
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90 | if ($self->{'info_only'}) {
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91 | # don't worry about modifying options
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92 | return bless $self, $class;
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93 | }
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94 | # trim any ex. from document field iff it's the only metadata namespace prefix
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95 | $self->{'document_field'} =~ s/^ex\.([^.]+)$/$1/;
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96 | return bless $self, $class;
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97 | }
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98 |
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99 | sub get_default_process_exp {
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100 | my $self = shift (@_);
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101 |
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102 | return q^(?i)(\.oai)$^;
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103 | }
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104 |
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105 | sub get_doctype {
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106 | my $self = shift(@_);
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107 |
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108 | return "OAI-PMH";
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109 | }
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110 |
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111 | sub xml_start_document {
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112 | my $self = shift (@_);
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113 | $self->{'in_metadata_node'} = 0;
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114 | $self->{'rawxml'} = "";
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115 | $self->{'saved_metadata'} = {};
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116 | }
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117 |
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118 | sub xml_end_document {
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119 | }
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120 |
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121 | sub xml_doctype {
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122 | my $self = shift(@_);
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123 |
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124 | my ($expat, $name, $sysid, $pubid, $internal) = @_;
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125 |
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126 | ##die "" if ($name !~ /^OAI-PMH$/);
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127 |
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128 | my $outhandle = $self->{'outhandle'};
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129 | print $outhandle "OAIPlugin: processing $self->{'file'}\n" if $self->{'verbosity'} > 1;
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130 | print STDERR "<Processing n='$self->{'file'}' p='OAIPlugin'>\n" if $self->{'gli'};
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131 |
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132 | }
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133 |
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134 |
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135 | sub xml_start_tag {
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136 | my $self = shift(@_);
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137 | my ($expat,$element) = @_;
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138 |
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139 | my %attr_hash = %_;
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140 |
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141 | my $attr = "";
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142 | map { $attr .= " $_=$attr_hash{$_}"; } keys %attr_hash;
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143 |
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144 | $self->{'rawxml'} .= "<$element$attr>";
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145 |
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146 | if ($element eq "metadata") {
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147 | $self->{'in_metadata_node'} = 1;
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148 | $self->{'metadata_xml'} = "";
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149 | }
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150 |
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151 | if ($self->{'in_metadata_node'}) {
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152 | $self->{'metadata_xml'} .= "<$element$attr>";
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153 | }
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154 | }
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155 |
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156 | sub xml_end_tag {
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157 | my $self = shift(@_);
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158 | my ($expat, $element) = @_;
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159 |
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160 | $self->{'rawxml'} .= "</$element>";
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161 |
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162 | if ($self->{'in_metadata_node'}) {
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163 | $self->{'metadata_xml'} .= "</$element>";
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164 | }
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165 |
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166 | if ($element eq "metadata") {
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167 | my $textref = \$self->{'metadata_xml'};
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168 | #my $metadata = $self->{'metadata'};
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169 | my $metadata = $self->{'saved_metadata'};
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170 | $self->extract_oai_metadata($textref,$metadata);
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171 |
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172 | $self->{'in_metadata_node'} = 0;
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173 | }
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174 |
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175 |
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176 | }
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177 |
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178 | sub xml_text {
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179 | my $self = shift(@_);
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180 | my ($expat) = @_;
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181 |
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182 | $self->{'rawxml'} .= $_;
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183 |
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184 | if ($self->{'in_metadata_node'}) {
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185 | $self->{'metadata_xml'} .= $_;
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186 | }
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187 | }
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188 |
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189 |
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190 | sub metadata_read {
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191 | my $self = shift (@_);
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192 |
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193 | my ($pluginfo, $base_dir, $file, $block_hash,
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194 | $extrametakeys, $extrametadata, $extrametafile,
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195 | $processor, $gli, $aux) = @_;
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196 |
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197 | # can we process this file??
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198 | my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);
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199 | return undef unless $self->can_process_this_file_for_metadata($filename_full_path);
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200 |
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201 | if (!$self->parse_file($filename_full_path, $file, $gli)) {
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202 | $self->{'saved_metadata'} = undef;
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203 | return undef;
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204 | }
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205 |
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206 | my $new_metadata = $self->{'saved_metadata'};
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207 | $self->{'saved_metadata'} = undef;
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208 |
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209 | # add the pretty metadata table as metadata
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210 | my $ppmd_table = $self->{'ppmd_table'};
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211 | $new_metadata->{'prettymd'} = $ppmd_table;
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212 | $self->{'ppmd_table'} = undef;
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213 |
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214 | my $document_metadata_field = $self->{'document_field'};
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215 | my $url_array = $new_metadata->{$document_metadata_field};
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216 | if (!defined $url_array) {
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217 | # try ex.
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218 | $url_array = $new_metadata->{"ex.$document_metadata_field"};
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219 | }
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220 | my $num_urls = (defined $url_array) ? scalar(@$url_array) : 0;
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221 | ##print STDERR "$num_urls urls for $file\n";
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222 | my $srcdoc_exists = 0;
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223 | my $srcdoc_pos = 0;
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224 | my $filename_dir = &util::filename_head($filename_full_path);
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225 |
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226 | # filenames in extrametadata must be relative to current dir, as
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227 | # DirectoryPlugin adds path info on itself
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228 | my ($filename_for_metadata) = $file =~ /([^\\\/]+)$/; # this assumes there will only be one record per oai file - is this always the case??
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229 | for (my $i=0; $i<$num_urls; $i++) {
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230 |
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231 | if ($url_array->[$i] !~ m/^(https?|ftp):/) {
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232 |
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233 | my $src_filename = &util::filename_cat($filename_dir, $url_array->[$i]);
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234 | if (-e $src_filename) {
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235 | $srcdoc_pos = $i;
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236 | $srcdoc_exists = 1;
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237 | # get the slashes the right way, use filename_cat
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238 | $filename_for_metadata = &util::filename_cat($url_array->[$i]);
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239 | last;
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240 | }
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241 | }
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242 | }
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243 |
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244 | if ($srcdoc_exists) {
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245 | $self->{'oai-files'}->{$file}->{'srcdoc_exists'} = 1;
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246 | }
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247 | else {
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248 | # save the rawxml for the source document
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249 | $self->{'oai-files'}->{$file}->{'srcdoc_exists'} = 0;
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250 | $self->{'oai-files'}->{$file}->{'rawxml'} = $self->{'rawxml'};
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251 | $self->{'rawxml'} = "";
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252 | }
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253 |
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254 | # return all the metadata we have extracted to the caller.
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255 | # Directory plug will pass it back in at read time, so we don't need to extract it again.
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256 | # extrametadata keys should be regular expressions
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257 | $filename_for_metadata = &util::filename_to_regex($filename_for_metadata);
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258 | $extrametadata->{$filename_for_metadata} = $new_metadata;
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259 | push(@$extrametakeys, $filename_for_metadata);
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260 | if ($srcdoc_exists) {
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261 | if (!defined $extrametafile->{$filename_for_metadata}) {
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262 | $extrametafile->{$filename_for_metadata} = {};
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263 | }
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264 | #maps the file to full path
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265 | $extrametafile->{$filename_for_metadata}->{$file} = $filename_full_path;
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266 | }
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267 | return 1;
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268 |
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269 | }
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270 |
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271 |
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272 | sub read {
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273 | my $self = shift (@_);
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274 |
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275 | my ($pluginfo, $base_dir, $file, $block_hash, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
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276 |
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277 | if (!defined $self->{'oai-files'}->{$file}) {
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278 | return undef;
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279 | }
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280 |
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281 | my $srcdoc_exists = $self->{'oai-files'}->{$file}->{'srcdoc_exists'};
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282 | if ($srcdoc_exists) {
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283 | # do nothing more - all the metadata has been extracted and associated with the srcdoc
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284 | # no more need to access details of this $file => tidy up as you go
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285 | delete $self->{'oai-files'}->{$file};
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286 | return 0; # not processed here, but don't pass on to rest of plugins
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287 | }
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288 |
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289 | my $filename = $file;
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290 | $filename = &util::filename_cat ($base_dir, $file) if $base_dir =~ /\w/;
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291 |
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292 | # Do encoding stuff on metadata
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293 | my ($language, $encoding) = $self->textcat_get_language_encoding ($filename);
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294 |
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295 | # create a new document
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296 | my $doc_obj = new doc ($filename, "indexed_doc", $self->{'file_rename_method'});
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297 | my $top_section = $doc_obj->get_top_section;
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298 | my $plugin_type = $self->{'plugin_type'};
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299 |
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300 | my ($filemeta) = $file =~ /([^\\\/]+)$/;
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301 | my $plugin_filename_encoding = $self->{'filename_encoding'};
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302 | my $filename_encoding = $self->deduce_filename_encoding($file,$metadata,$plugin_filename_encoding);
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303 | $self->set_Source_metadata($doc_obj, $filename, $filename_encoding);
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304 |
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305 | $doc_obj->add_utf8_metadata($top_section, "Language", $language);
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306 | $doc_obj->add_utf8_metadata($top_section, "Encoding", $encoding);
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307 | $doc_obj->add_utf8_metadata($top_section, "Plugin", $plugin_type);
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308 | $doc_obj->add_metadata($top_section, "FileFormat", "OAI");
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309 | $doc_obj->add_metadata($top_section, "FileSize", (-s $filename));
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310 |
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311 | # include any metadata passed in from previous plugins
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312 | # note that this metadata is associated with the top level section
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313 | # this will include all the metadata from the oai file that we extracted
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314 | # during metadata_read
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315 | $self->extra_metadata ($doc_obj, $doc_obj->get_top_section(), $metadata);
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316 |
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317 | # do plugin specific processing of doc_obj
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318 | my $text = $self->{'oai-files'}->{$file}->{'rawxml'};
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319 | delete $self->{'oai-files'}->{$file};
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320 |
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321 | unless (defined ($self->process(\$text, $pluginfo, $base_dir, $file, $metadata, $doc_obj))) {
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322 | print STDERR "<ProcessingError n='$file'>\n" if ($gli);
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323 | return -1;
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324 | }
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325 |
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326 | # do any automatic metadata extraction
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327 | $self->auto_extract_metadata ($doc_obj);
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328 |
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329 | # add an OID
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330 | $self->add_OID($doc_obj);
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331 |
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332 | # process the document
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333 | $processor->process($doc_obj);
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334 |
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335 | $self->{'num_processed'} ++;
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336 |
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337 | return 1; # processed the file
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338 | }
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339 |
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340 |
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341 | # do plugin specific processing of doc_obj
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342 | sub process {
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343 | my $self = shift (@_);
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344 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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345 | my $outhandle = $self->{'outhandle'};
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346 |
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347 | print STDERR "<Processing n='$file' p='OAIPlugin'>\n" if ($gli);
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348 | print $outhandle "OAIPlugin: processing $file\n"
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349 | if $self->{'verbosity'} > 1;
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350 |
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351 | my $cursection = $doc_obj->get_top_section();
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352 |
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353 | ## $self->extract_metadata ($textref, $metadata, $doc_obj, $cursection);
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354 |
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355 | # add text to document object
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356 |
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357 | # $$textref =~ s/<(.*?)>/$1 /g;
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358 | $$textref =~ s/</</g;
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359 | $$textref =~ s/>/>/g;
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360 | $$textref =~ s/\[/[/g;
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361 | $$textref =~ s/\]/]/g;
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362 |
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363 | $doc_obj->add_utf8_text($cursection, $$textref);
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364 |
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365 | return 1;
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366 | }
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367 |
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368 |
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369 | # Improvement is to merge this with newer version in MetadataPass
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370 |
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371 | sub open_prettyprint_metadata_table
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372 | {
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373 | my $self = shift(@_);
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374 |
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375 | my $att = "width=100% cellspacing=2";
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376 | my $style = "style=\'border-bottom: 4px solid #000080\'";
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377 |
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378 | $self->{'ppmd_table'} = "\n<table $att $style>";
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379 | }
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380 |
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381 | sub add_prettyprint_metadata_line
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382 | {
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383 | my $self = shift(@_);
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384 | my ($metaname, $metavalue_utf8) = @_;
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385 |
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386 | $metavalue_utf8 = &util::hyperlink_text($metavalue_utf8);
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387 |
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388 | $self->{'ppmd_table'} .= " <tr bgcolor=#b5d3cd>\n";
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389 | $self->{'ppmd_table'} .= " <td width=30%>\n";
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390 | $self->{'ppmd_table'} .= " $metaname\n";
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391 | $self->{'ppmd_table'} .= " </td>\n";
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392 | $self->{'ppmd_table'} .= " <td>\n";
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393 | $self->{'ppmd_table'} .= " $metavalue_utf8\n";
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394 | $self->{'ppmd_table'} .= " </td>\n";
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395 | $self->{'ppmd_table'} .= " </tr>\n";
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396 |
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397 | }
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398 |
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399 | sub close_prettyprint_metadata_table
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400 | {
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401 | my $self = shift(@_);
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402 |
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403 | $self->{'ppmd_table'} .= "</table>\n";
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404 | }
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405 |
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406 | my $qualified_dc_mapping = {
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407 | "alternative" => "dc.title",
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408 | "tableOfContents" => "dc.description",
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409 | "abstract" => "dc.description",
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410 | "created" => "dc.date",
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411 | "valid" => "dc.date",
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412 | "available" => "dc.date",
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413 | "issued" => "dc.date",
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414 | "modified" => "dc.date",
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415 | "dateAccepted" => "dc.date",
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416 | "dateCopyrighted" => "dc.date",
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417 | "dateSubmitted" => "dc.date",
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418 | "extent" => "dc.format",
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419 | "medium" => "dc.format",
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420 | "isVersionOf" => "dc.relation",
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421 | "hasVersion" => "dc.relation",
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422 | "isReplacedBy" => "dc.relation",
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423 | "replaces" => "dc.relation",
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424 | "isRequiredBy" => "dc.relation",
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425 | "requires" => "dc.relation",
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426 | "isPartOf" => "dc.relation",
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427 | "hasPart" => "dc.relation",
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428 | "isReferencedBy" => "dc.relation",
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429 | "references" => "dc.relation",
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430 | "isFormatOf" => "dc.relation",
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431 | "hasFormat" => "dc.relation",
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432 | "conformsTo" => "dc.relation",
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433 | "spatial" => "dc.coverage",
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434 | "temporal" => "dc.coverage",
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435 | # these are now top level elements in our qualified dc metadata set
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436 | # "audience" => "dc.any",
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437 | # "accrualMethod" => "dc.any",
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438 | # "accrualPeriodicity" => "dc.any",
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439 | # "accrualPolicy" => "dc.any",
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440 | # "instructionalMethod" => "dc.any",
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441 | # "provenance" => "dc.any",
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442 | # "rightsHolder" => "dc.any",
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443 | "mediator" => "dc.audience",
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444 | "educationLevel" => "dc.audience",
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445 | "accessRights" => "dc.rights",
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446 | "license" => "dc.rights",
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447 | "bibliographicCitation" => "dc.identifier"
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448 | };
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449 |
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450 | sub remap_dc_metadata
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451 | {
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452 | my $self = shift(@_);
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453 |
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454 | my ($metaname) = @_;
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455 |
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456 | my ($prefix,$name) = ($metaname =~ m/^(.*?)\.(.*?)$/);
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457 |
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458 | if (defined $qualified_dc_mapping->{$name}) {
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459 |
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460 | return $qualified_dc_mapping->{$name}."^".$name;
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461 | }
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462 |
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463 |
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464 | return $metaname; # didn't get a match, return param passed in unchanged
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465 | }
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466 |
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467 |
|
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468 | sub extract_oai_metadata {
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469 | my $self = shift (@_);
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470 | my ($textref, $metadata) = @_;
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471 | my $outhandle = $self->{'outhandle'};
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472 |
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473 | $self->open_prettyprint_metadata_table();
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474 |
|
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475 | if ($$textref =~ m/<metadata\s*>(.*?)<\/metadata\s*>/s)
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476 | {
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477 | my $metadata_text = $1;
|
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478 |
|
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479 | # locate and remove outermost tag (ignoring any attribute information in top-level tag)
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480 | my ($outer_tagname,$inner_metadata_text) = ($metadata_text =~ m/<([^ >]+).*?>(.*?)<\/\1>/s);
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481 | # split tag into namespace and tag name
|
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482 | my($namespace,$top_level_prefix) = ($outer_tagname =~ m/^(.*?):(.*?)$/);
|
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483 | # sometimes, the dc namespace is not specified as the prefix in each element (like <dc:title>)
|
---|
484 | # but is rather defined in the wrapper element containing the various dc meta elements,
|
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485 | # like <dc><title></title><creator></creator></dc>.
|
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486 | # In such a case, we use this wrapper element as the top_level_prefix
|
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487 |
|
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488 | # if there was no prefix, then the tag itself becomes the top_level_prefix
|
---|
489 | if(!defined $top_level_prefix && defined $outer_tagname) {
|
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490 | $top_level_prefix = $outer_tagname;
|
---|
491 | }
|
---|
492 |
|
---|
493 | #process each element one by one
|
---|
494 | while ($inner_metadata_text =~ m/<([^ >]+).*?>(.*?)<\/\1>(.*)/s)
|
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495 | {
|
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496 |
|
---|
497 | my $metaname = $1;
|
---|
498 | my $metavalue = $2;
|
---|
499 | $inner_metadata_text = $3;
|
---|
500 |
|
---|
501 | # greenstone uses . for namespace, while oai uses :
|
---|
502 | $metaname =~ s/:/\./;
|
---|
503 | # if there is no namespace, then we use the outer tag name or
|
---|
504 | # namespace for this element
|
---|
505 | if ($metaname !~ m/\./)
|
---|
506 | {
|
---|
507 | $metaname = "$top_level_prefix.$metaname";
|
---|
508 | }
|
---|
509 |
|
---|
510 | # if metadata set is auto, leave as is, otherwise convert to
|
---|
511 | # specified namespace
|
---|
512 | if ($self->{'metadata_set'} ne "auto") {
|
---|
513 | if ($metaname !~ /^gi\./) { # hack to not overwrite gi metadata
|
---|
514 | $metaname =~ s/^([^\.]*)\./$self->{'metadata_set'}\./;
|
---|
515 | if ($self->{'metadata_set'} eq "dc") {
|
---|
516 | # convert qualified dc terms to gs version, e.g.
|
---|
517 | # spatial becomes coverage^spatial
|
---|
518 | $metaname = $self->remap_dc_metadata($metaname);
|
---|
519 | }
|
---|
520 | }
|
---|
521 | }
|
---|
522 |
|
---|
523 | # uppercase the first char of the name
|
---|
524 | $metaname =~ s/\.(.)/\.\u$1/;
|
---|
525 | $metavalue =~ s/\[/[/g;
|
---|
526 | $metavalue =~ s/\]/]/g;
|
---|
527 |
|
---|
528 | # so that GLI can see this metadata, store here as ex.dc.Title etc
|
---|
529 | my $ex_metaname = $metaname;
|
---|
530 | $ex_metaname =~ s/^ex\.//; # remove any pre-existing ex. prefix
|
---|
531 | $ex_metaname = "ex.$ex_metaname"; # at last can prefix ex.
|
---|
532 |
|
---|
533 | if (defined $metadata->{$ex_metaname})
|
---|
534 | {
|
---|
535 | push(@{$metadata->{$ex_metaname}},$metavalue);
|
---|
536 |
|
---|
537 | }
|
---|
538 | else
|
---|
539 | {
|
---|
540 | $metadata->{$ex_metaname} = [ $metavalue ];
|
---|
541 | }
|
---|
542 |
|
---|
543 | # but don't add ex to the pretty print line
|
---|
544 | $self->add_prettyprint_metadata_line($metaname, $metavalue);
|
---|
545 |
|
---|
546 | }
|
---|
547 | }
|
---|
548 |
|
---|
549 | $self->close_prettyprint_metadata_table();
|
---|
550 | }
|
---|
551 |
|
---|
552 | ## we know from the file extension, so doesn't need to check the doctype
|
---|
553 | sub check_doctype {
|
---|
554 |
|
---|
555 | return 1;
|
---|
556 | }
|
---|
557 |
|
---|
558 | 1;
|
---|