3 use strict; # always use
6 use Digest::MD5 qw(md5_base64);
7 use POSIX qw(ceil floor);
8 use Date::Calc qw(Today_and_Now Delta_YMDHMS);
14 # Copyright 2007 Paul POULAIN
16 # This file is part of Koha
18 # Koha is free software; you can redistribute it and/or modify it under the
19 # terms of the GNU General Public License as published by the Free Software
20 # Foundation; either version 2 of the License, or (at your option) any later
23 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
24 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
25 # A PARTICULAR PURPOSE. See the GNU General Public License for more details.
27 # You should have received a copy of the GNU General Public License along with
28 # Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
29 # Suite 330, Boston, MA 02111-1307 USA
33 opac-search.pl : script to have RSS feeds automatically on each OPAC search
37 on each query (on OPAC), a link to this script is automatically added. The user can save it's queries as RSS feeds.
42 - build the RDF file from the query
43 - save the RDF file in a opac/rss directory for caching : the RDF is calculated only once every 30mn, and the cache file name is calculated by a md5_base64 of the query (each user registering the same query will use the same cache : speed improvement)
44 - let the user specify it's query (q parameter : opac-rss.pl?q=ti:hugo)
45 - let the user specify the number of results returned (by default 20, but there are no limits : opac-rss.pl?q=ti:hugo&size=9999)
47 This script auto calculates the website URL
53 - Koha: $query as RSS title
55 - LibraryName systempreference as RDF description and creator
56 - copyright currentyear
57 - biblio title as RSS "title" and biblio author as RSS description
61 # create a new CGI object
62 # not sure undef_params option is working, need to test
63 use CGI qw('-no_undef_params');
67 my $query = $cgi->param('q');
70 # the number of lines to retrieve
71 my $size=$cgi->param('size') || 50;
73 # the filename of the cached rdf file.
74 my $filename = md5_base64($query);
75 my $rss = new XML::RSS (version => '1.0');
78 my $url = $cgi->url();
79 $url =~ s/opac-rss\.pl.*//;
80 $url =~ /(http:\/\/.*?)\//;
83 my $RDF_update_needed=1;
84 my ($year,$month,$day, $hour,$min,$sec) = Today_and_Now();
86 if (-e "rss/$filename") {
87 $rss->parsefile("rss/$filename");
88 # check if we have to rebuild the RSS feed (once every 30mn), or just return the actual rdf
89 my $rdf_stamp = $rss->{'channel'}->{'dc'}->{'date'};
90 $rdf_stamp =~ /(.*)-(.*)-(.*):(.*):(.*):(.*)/;
91 my ($stamp_year,$stamp_month,$stamp_day,$stamp_hour,$stamp_min,$stamp_sec) = ($1,$2,$3,$4,$5,$6);
92 # if more than 30 mn since the last RDF update, rebuild the RDF. Otherwise, just return it
93 unless (($year-$stamp_year >0) or ($month-$stamp_month >0) or ($day-$stamp_day >0) or ($hour-$stamp_hour >0) or ($min-$stamp_min >30)) {
94 $RDF_update_needed =0;
98 if ($RDF_update_needed) {
99 # warn "RDF update in progress";
101 title => "Koha : $query",
102 description => C4::Context->preference("LibraryName"),
105 date => "$year-$month-$day:$hour:$min:$sec",
107 creator => C4::Context->preference("LibraryName"),
108 rights => "Copyright $year" ,
109 language => C4::Context->preference("opaclanguages"),
113 my $total; # the total results for the whole set
114 my ($error, $marcresults) = SimpleSearch($query);
116 my $hits = scalar @$marcresults;
117 $hits=$size if $hits > $size;
119 for(my $i=0;$i<$hits;$i++) {
121 my $marcrecord = MARC::File::USMARC::decode($marcresults->[$i]);
122 my $biblio = TransformMarcToKoha(C4::Context->dbh,$marcrecord,'');
123 # check if the entry is already in the feed. Otherwise, pop the $line th line and add this new one.
124 my $already_in_feed=0;
125 foreach (@{$rss->{'items'}}) {
126 if ($_->{'link'} =~ /biblionumber=$biblio->{'biblionumber'}/) {
130 unless ($already_in_feed) {
131 pop(@{$rss->{'items'}}) if (@{$rss->{'items'}} >= $size);
132 $rss->add_item(title => $biblio->{'title'},
133 description => $biblio->{'author'},
134 link => "$url/opac-detail.pl?biblionumber=".$biblio->{'biblionumber'},
140 $rss->save("rss/$filename");
142 # warn "RDF CACHE used"
144 print $cgi->header(-type => "application/rss+xml");
145 print $rss->as_string;