opac/unapi

   1 #!/usr/bin/perl
   2
   3 # Copyright 2008-2009 LibLime
   4 #
   5 # This file is part of Koha.
   6 #
   7 # Koha is free software; you can redistribute it and/or modify it
   8 # under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # Koha is distributed in the hope that it will be useful, but
  13 # WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with Koha; if not, see <http://www.gnu.org/licenses>.
  19
  20 use strict;
  21 use warnings;
  22
  23 =head1 NAME
  24
  25 unapi - implement unAPI for the OPAC
  26
  27 =head1 SYNOPSIS
  28
  29 Retrieve http://library.example.org/cgi-bin/koha/unapi?id=koha:biblionumber:123&format=oai_dc
  30
  31 =head1 DESCRIPTION
  32
  33 Implements unAPI <http://unapi.info>, a small HTTP API for retrieving structured
  34 content from a web application.  The primary application of unAPI in Koha is to
  35 allow tools such as Zotero to identify and grab bibliographic record metadata in
  36 an XML format such as OAI DC, RSS2, MARCXML, or MODS.
  37
  38 =cut
  39
  40 use CGI qw ( -utf8 );
  41 use C4::Context;
  42 use C4::Biblio;
  43 use XML::LibXML;
  44 use XML::LibXSLT;
  45
  46 my $cgi = CGI->new();
  47 binmode(STDOUT, ":encoding(UTF-8)"); #output as utf8
  48
  49 =head1 VARIABLES
  50
  51 =head2 $format_to_stylesheet_map
  52
  53 This hashref of hashrefs maps from a MARC flavour and unAPI format
  54 to the stylesheet that should be used to transform the bib MARCXML
  55 to the desired output format.  As new MARC XSLT stylesheets are added,
  56 (particularly for UNIMARC), this map should be updated.  Of course,
  57 if/when we add support for emitting a format that is not genreated
  58 by a stylesheet, the structure of this variable will have to be changed.
  59 At present, this doubles as the list of output formats supported by
  60 this unAPI implementation.
  61
  62 =cut
  63
  64 my $format_to_stylesheet_map = {
  65     'MARC21' => {
  66         'marcxml'      => 'identity.xsl',
  67         'marcxml-full' => 'identity.xsl',
  68         'mods'         => 'MARC21slim2MODS.xsl',
  69         'mods-full'    => 'MARC21slim2MODS.xsl',
  70         'mods3'        => 'MARC21slim2MODS3-1.xsl',
  71         'mods3-full'   => 'MARC21slim2MODS3-1.xsl',
  72         'oai_dc'       => 'MARC21slim2OAIDC.xsl',
  73         'rdfdc',       => 'MARC21slim2RDFDC.xsl',
  74         'rss2'         => 'MARC21slim2RSS2.xsl',
  75         'rss2-full'    => 'MARC21slim2RSS2.xsl',
  76         'srw_dc'       => 'MARC21slim2SRWDC.xsl',
  77     },
  78     'NORMARC' => {
  79         'marcxml'      => 'identity.xsl',
  80         'marcxml-full' => 'identity.xsl',
  81         'mods'         => 'MARC21slim2MODS.xsl',
  82         'mods-full'    => 'MARC21slim2MODS.xsl',
  83         'mods3'        => 'MARC21slim2MODS3-1.xsl',
  84         'mods3-full'   => 'MARC21slim2MODS3-1.xsl',
  85         'oai_dc'       => 'MARC21slim2OAIDC.xsl',
  86         'rdfdc',       => 'MARC21slim2RDFDC.xsl',
  87         'rss2'         => 'MARC21slim2RSS2.xsl',
  88         'rss2-full'    => 'MARC21slim2RSS2.xsl',
  89         'srw_dc'       => 'MARC21slim2SRWDC.xsl',
  90     },
  91     'UNIMARC' => {
  92         'marcxml'      => 'identity.xsl',
  93         'marcxml-full' => 'identity.xsl',
  94         'oai_dc'       => 'UNIMARCslim2OAIDC.xsl',
  95     },
  96 };
  97
  98 =head2 $format_info
  99
 100 This hashref maps from unAPI output formats to the <format> elements
 101 used to describe them in an unAPI format request.
 102
 103 =cut
 104
 105 my $format_info = {
 106     'marcxml' => q(<format name="marcxml" type="application/xml" namespace_uri="http://www.loc.gov/MARC21/slim" docs="http://www.loc.gov/marcxml/" schema_location="http://www.loc.gov/standards/marcxml/schema/MARC21slim.xsd"/>),
 107     'marcxml-full' => q(<format name="marcxml-full" type="application/xml" namespace_uri="http://www.loc.gov/MARC21/slim" docs="http://www.loc.gov/marcxml/" schema_location="http://www.loc.gov/standards/marcxml/schema/MARC21slim.xsd"/>),
 108     'mods' => q(<format name="mods" type="application/xml" namespace_uri="http://www.loc.gov/mods/" docs="http://www.loc.gov/mods/" schema_location="http://www.loc.gov/standards/mods/mods.xsd"/>),
 109     'mods-full' => q(<format name="mods-full" type="application/xml" namespace_uri="http://www.loc.gov/mods/" docs="http://www.loc.gov/mods/" schema_location="http://www.loc.gov/standards/mods/mods.xsd"/>),
 110     'mods3' => q(<format name="mods3" type="application/xml" namespace_uri="http://www.loc.gov/mods/v3" docs="http://www.loc.gov/mods/" schema_location="http://www.loc.gov/standards/mods/v3/mods-3-1.xsd"/>),
 111     'mods3-full' => q(<format name="mods3-full" type="application/xml" namespace_uri="http://www.loc.gov/mods/v3" docs="http://www.loc.gov/mods/" schema_location="http://www.loc.gov/standards/mods/v3/mods-3-1.xsd"/>),
 112     'oai_dc' => q(<format name="oai_dc" type="application/xml" namespace_uri="http://www.openarchives.org/OAI/2.0/oai_dc/" schema_location="http://www.openarchives.org/OAI/2.0/oai_dc.xsd"/>),
 113     'rdfdc' => q(<format name="rdfdc" type="application/xml" namespace_uri="http://purl.org/dc/elements/1.1/" schema_location="http://purl.org/dc/elements/1.1/"/>),
 114     'rss2' => q(<format name="rss2" type="application/xml"/>),
 115     'rss2-full' => q(<format name="rss2-full" type="application/xml"/>),
 116     'srw_dc' => q(<format name="srw_dc" type="application/xml" namespace_uri="info:srw/schema/1/dc-schema" schema_location="http://www.loc.gov/z3950/agency/zing/srw/dc-schema.xsd"/>),
 117 };
 118
 119 my $id     = $cgi->param('id');
 120 my $format = $cgi->param('format');
 121
 122 if (not defined $format) {
 123     emit_formats($id, $format_to_stylesheet_map, $format_info, $cgi);
 124 } elsif ($id) {
 125
 126     # koha:biblionumber:0152018484
 127     if ($id =~ /koha:biblionumber:(\d+)/) {
 128         my $biblionumber = $1;
 129
 130         my $content;
 131         eval {
 132             my $marcxml = GetXmlBiblio($biblionumber);
 133             unless (defined $marcxml) {
 134                 # no bib, so 404
 135                 print $cgi->header( -status => '404 record not found');
 136                 exit 0;
 137             }
 138
 139             my $transformer = get_transformer($format, $format_to_stylesheet_map, $format_info);
 140             unless (defined $transformer) {
 141                 print $cgi->header( -status => '406 invalid format requested' );
 142                 exit 0;
 143             }
 144             my $parser = XML::LibXML->new();
 145             my $record_dom = $parser->parse_string( $marcxml );
 146             $record_dom = $transformer->transform( $record_dom );
 147             $content = $record_dom->toString();
 148         };
 149         if ($@) {
 150             print $cgi->header( -status => '500 internal error ' . $@->code() . ": " . $@->message() );
 151             exit 0;
 152         }
 153
 154         print $cgi->header( -type =>'application/xml' );
 155         print $content;
 156     } else {
 157         # ID is obviously wrong, so 404
 158         print $cgi->header( -status => '404 record not found');
 159         exit 0;
 160     }
 161 } else {
 162     # supplied a format but no id - caller is doing it wrong
 163     print $cgi->header( -status => '400 bad request - if you specify format, must specify id');
 164     exit 0;
 165 }
 166
 167 exit 0;
 168
 169 sub emit_formats {
 170     my ($id, $format_to_stylesheet_map, $format_info, $cgi) = @_;
 171
 172     if (defined $id) {
 173         print $cgi->header( -type =>'application/xml', -status => '300 multiple choices' );
 174     } else {
 175         print $cgi->header( -type =>'application/xml' );
 176     }
 177
 178     print "<?xml version='1.0' encoding='utf-8'  ?>\n";
 179     if (defined $id) {
 180         print qq(<formats id="$id">\n);
 181     } else {
 182         print "<formats>\n";
 183     }
 184
 185     my $marcflavour = uc(C4::Context->preference('marcflavour'));
 186     foreach my $format (sort keys %{ $format_to_stylesheet_map->{$marcflavour} }) {
 187         print $format_info->{$format}, "\n";
 188     }
 189     print "</formats>\n";
 190     return;
 191 }
 192
 193
 194 sub get_transformer {
 195     my ($format, $format_to_stylesheet_map, $format_info) = @_;
 196     $format = lc $format;
 197
 198     my $marcflavour = uc(C4::Context->preference('marcflavour'));
 199     return unless $format_to_stylesheet_map->{$marcflavour}->{$format};
 200
 201     my $xslt_file = C4::Context->config('intrahtdocs') .
 202                     "/prog/en/xslt/" .
 203                     $format_to_stylesheet_map->{$marcflavour}->{$format};
 204
 205     my $parser = XML::LibXML->new();
 206     my $xslt = XML::LibXSLT->new();
 207     my $style_doc = $parser->parse_file( $xslt_file );
 208     my $stylesheet = $xslt->parse_stylesheet( $style_doc );
 209
 210     return $stylesheet;
 211 }
 212
 213 =head1 AUTHOR
 214
 215 Koha Development Team <http://koha-community.org/>
 216
 217 Originally written by Joshua Ferraro <jmf@liblime.com>
 218
 219 Improved by Galen Charlton <galen.charlton@liblime.com>
 220
 221 =cut