Bug 37206: Removing an item from a label batch should be a CSRF-protected POST operation

This patch updates the label batch edit template so that removing a
single or multiple items from a batch is a CSRF-protected POST
operation.

The patch also removes the existing "if ($op eq 'cud-delete') {" section
of label-edit-batch.pl because it was unused.

To test, apply the patch and go to Cataloging -> Labels.

- Create a label batch and add multiple items to it.
- From the list of label batches, click "Edit" on the batch you created.
- Click the "Delete" button for one of the items in the batch.
  - If you confirm, the item should be deleted.
- In the "Select" column, check multiple checkboxes.
- Click the "Remove selected items" button in the toolbar.
  - Verify that confirming this operation results in the items being
    deleted from the batch.

Sponsored-by: Athens County Public Libraries
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>

koha-tmpl/intranet-tmpl/prog/en/modules/labels/label-edit-batch.tt

@@ -166,8 +166,9 @@
                                                         <tr>
                                                             [% FOREACH text_field IN table_loo.text_fields %]
                                                                 [% IF ( text_field.select_field ) %]
-                                                                    <td>
-                                                                        <a class="btn btn-default btn-xs delete" href="/cgi-bin/koha/labels/label-edit-batch.pl?op=remove&amp;batch_id=[% batch_id |url %]&amp;label_id=[% text_field.field_value |url %]"><i class="fa fa-trash-can"></i> Delete</a>
+                                                                    <td class="actions">
+                                                                        <a class="btn btn-default btn-xs submit-form-link" id="deletebatch" href="#" data-op="cud-delete" data-batch_id="[% batch_id | html %]" data-label_id="[% text_field.field_value | html %]" data-method="post" data-action="/cgi-bin/koha/labels/label-edit-batch.pl" data-confirmation-msg="Are you sure you want to delete this?"><i class="fa fa-trash-can"></i> Delete</a>
+
                                                                         <a class="btn btn-default btn-xs export" href="#" data-batch-id="[% batch_id | html %]" data-label-id="[% text_field.field_value | html %]"><i class="fa-solid fa-share-from-square"></i> Export</a>
                                                                     </td>
                                                                     <td><input type="checkbox" name="action" value="[% text_field.field_value | html %]"></td>
@@ -205,6 +206,11 @@
         </div> <!-- /.col-sm-2.col-sm-pull-10 -->
      </div> <!-- /.row -->
 
+    <form action="/cgi-bin/koha/labels/label-edit-batch.pl" id="batch_remove_form" method="post">
+        [% INCLUDE 'csrf-token.inc' %]
+        <input type="hidden" name="op" value="cud-delete" />
+        <input type="hidden" name="batch_id" value="[% batch_id | html %]" />
+    </form>
 [% MACRO jsinclude BLOCK %]
     [% INCLUDE 'greybox.inc' %]
     [% INCLUDE 'datatables.inc' %]
@@ -222,17 +228,18 @@
                 return true;    // ok
             }
         }
+
         function Remove() {
+            const batch_remove_form = $("#batch_remove_form");
             items = new Array;
             item_num = new Array;
             if(document.items.action.length > 0) {
                 for (var i=0; i < document.items.action.length; i++) {
                     if (document.items.action[i].checked) {
-                        items.push("label_id=" +  document.items.action[i].value);
-                        item_num.push(i+1);
+                        items.push( document.items.action[i].value );
+                        item_num.push( i + 1 );
                     }
                 }
-                getstr = items.join("&");
                 item_msg = item_num.join(", ");
                 var msg = _("Are you sure you want to remove label number(s): %s from this batch?").format(item_msg);
             } else if (document.items.action.checked) {
@@ -242,13 +249,16 @@
                 alert(_("Please select at least one label to delete."));
                 return;     // no item selected
             }
-            var answer = confirm(msg);
-            if (answer) {
-                window.location = "/cgi-bin/koha/labels/label-edit-batch.pl?op=remove&amp;batch_id=[% batch_id | html %]&amp;" + getstr;
+            if ( confirm( msg ) ) {
+                items.forEach(( label_id ) => {
+                    batch_remove_form.append('<input type="hidden" name="label_id" value="' + label_id + '" />');
+                });
+                batch_remove_form.submit();
             } else {
                 return; // abort delete
             }
         }
+
         function Add() {
             var number_list = document.getElementById("number_list");
             if (number_list.value == '') {

labels/label-edit-batch.pl

@@ -67,7 +67,7 @@ $number_list = $cgi->param('number_list') if $cgi->param('number_list');
 
 my $branch_code = C4::Context->userenv->{'branch'};
 
-if ($op eq 'remove') {
+if ($op eq 'cud-delete') {
     $batch = C4::Labels::Batch->retrieve(batch_id => $batch_id);
     foreach my $label_id (@label_ids) {
     $err = $batch->remove_item($label_id);
@@ -77,10 +77,6 @@ if ($op eq 'remove') {
 #    print $cgi->redirect("label-edit-batch.pl?op=edit&batch_id=$batch_id");
 #    exit;
 }
-elsif ($op eq 'cud-delete') {
-    $err = C4::Labels::Batch::delete(batch_id => $batch_id, branch_code => $branch_code);
-    $errtype = 'BATCH_NOT_DELETED' if $err;
-}
 elsif ($op eq 'cud-add') {
     if ($number_list) {
         my @numbers_list = split /\n/, $number_list; # Entries are effectively passed in as a <cr> separated list