Bug 41060: Add a cataloguing plugin to check ISSN

Test plan:
- without patch login to Koha
- edit a biblio and put a wrong ISSN in 022a (011a for unimarc).
- leave the input field (looses focus), no warning
- apply patch and do "reset_all" to make a full re-install.
- edit the biblio again and put an invalid ISSN in 022a (011a for unimarc).
- when you leave the input field you should have a warning saying
  "invalid ISSN".
- the input field should turn yellow
- you can still save the biblio with a wrong issn, it is just a warning.
- if you apply the patch on an existing install, you must manually link
  the value builder to your existing frameworks to get it working.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: David Nind <david@davidnind.com>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

cataloguing/value_builder/validate_issn.pl

@@ -0,0 +1,68 @@
+#!/usr/bin/perl
+
+# Copyright 2025 BibLibre SARL
+#
+# This file is part of Koha.
+#
+# Koha is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# Koha is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Koha; if not, see <https://www.gnu.org/licenses>.
+
+use Modern::Perl;
+use CGI qw ( -utf8 );
+
+use C4::Auth       qw( get_template_and_user );
+use C4::Output     qw( output_html_with_http_headers );
+use Business::ISSN qw( is_valid_checksum );
+
+my $builder = sub {
+    my $params = shift;
+    my $id     = $params->{id};
+
+    return qq|
+<script>
+function Blur$id(event) {
+    field = \$('#'+event.data.id);
+    issn = field.val();
+    var url = '../cataloguing/plugin_launcher.pl?plugin_name=validate_issn.pl&issn=' + issn;
+    var req = \$.get(url);
+    req.done(function(resp){
+        if ( resp != 1 ) {
+           field.addClass("subfield_not_filled");
+           alert("Invalid ISSN : " + issn);
+           return;
+        }
+        field.removeClass("subfield_not_filled");
+    });
+}
+</script>|;
+};
+
+my $launcher = sub {
+    my $params = shift;
+    my $cgi    = $params->{cgi};
+    my $issn   = $cgi->param('issn');
+
+    my ( $template, $loggedinuser, $cookie ) = get_template_and_user(
+        {
+            template_name => "cataloguing/value_builder/ajax.tt",
+            query         => $cgi,
+            type          => "intranet",
+            flagsrequired => { editcatalogue => '*' },
+        }
+    );
+    my $is_valid = is_valid_checksum($issn);
+    $template->param( return => $is_valid );
+    output_html_with_http_headers $cgi, $cookie, $template->output;
+};
+
+return { builder => $builder, launcher => $launcher };

installer/data/mysql/en/marcflavour/marc21/mandatory/marc21_framework_DEFAULT.yml

@@ -4790,7 +4790,7 @@ tables:
           tab: 0
           authorised_value: ""
           authtypecode: ""
-          value_builder: ""
+          value_builder: validate_issn.pl
           isurl: 0
           hidden: 0
           frameworkcode: ""

installer/data/mysql/en/marcflavour/unimarc/mandatory/unimarc_framework_DEFAULT.yml

@@ -3230,7 +3230,7 @@ tables:
           tab: 0
           authorised_value:
           authtypecode: ""
-          value_builder: ""
+          value_builder: validate_issn.pl
           isurl: 0
           hidden: 0
           frameworkcode: ""