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Bug 34000: Prevent re-issuance of auto-generated cardnumbers 

When autoMemberNum is enabled, Koha picks the next cardnumber as
MAX(numeric cardnumber in borrowers) + 1. If patron A's auto-generated
cardnumber is later changed (e.g. they get a physical card) or the
patron is deleted, the original number becomes "free" and the next
self-registrant is assigned it -- inheriting anything third-party
services (OverDrive, Hoopla, unauthenticated self-check) have keyed on
the cardnumber.

This patch makes Koha::Patron::fixup_cardnumber use a monotonic counter
(the autoMemberNumValue syspref) so that once a number has been
auto-generated for any patron, it is never auto-generated again.

The syspref row is locked with SELECT ... FOR UPDATE inside the
existing txn_do, which serialises concurrent callers via InnoDB
row-level locking and addresses the race condition raised against
earlier revisions of this patch.

The formula is: next = MAX(counter, db_max) + 1. When the counter is 0
(pre-upgrade or missing syspref), this degrades gracefully to
db_max + 1 -- the legacy behaviour -- so no feature toggle is needed.
The counter is only bumped when Koha actually auto-generates a
cardnumber; plugin- or caller-supplied values do not touch it.

Test plan:
1. Enable autoMemberNum.
2. Self-register patron A via OPAC, note cardnumber N.
3. Edit patron A in the staff interface, change cardnumber to
   something non-numeric like "MANUAL-XYZ".
4. Self-register patron B.
5. Confirm B gets N+1, NOT N.
6. Delete patron A.
7. Self-register patron C.
8. Confirm C gets N+2, NOT A's original number.
9. Install a plugin implementing the patron_barcode_transform hook;
   confirm it still runs and its value is honoured (counter is not
   bumped when the plugin supplies a cardnumber).

Signed-off-by: Andrew Fuerste Henry <andrew@bywatersolutions.com>
Signed-off-by: Jacob O'Mara <Jacob.omara@openfifth.co.uk>
(cherry picked from commit ccfbb35de5)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
This commit is contained in:
Martin Renvoize 2026-04-21 10:57:16 +01:00 committed by Lucas Gass
parent b55535e770
commit f1a8e146ac
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1 changed files with 33 additions and 11 deletions
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44
Koha/Patron.pm
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@ -121,24 +121,46 @@ sub new {
=head3 fixup_cardnumber
Autogenerate next cardnumber from highest value found in database
Autogenerate next cardnumber from highest value found in database.
Uses the C<autoMemberNumValue> system preference as a monotonic floor so a
cardnumber is never re-issued after the original holder's cardnumber has been
changed or their account deleted. The syspref row is selected C<FOR UPDATE>
inside the enclosing transaction so that concurrent C<store()> callers are
serialised.
=cut
sub fixup_cardnumber {
my ($self) = @_;
my $max = $self->cardnumber;
Koha::Plugins->call( 'patron_barcode_transform', \$max );
my $next = $self->cardnumber;
Koha::Plugins->call( 'patron_barcode_transform', \$next );
$max ||= Koha::Patrons->search(
{ cardnumber => { -regexp => '^-?[0-9]+$' } },
{
select => \'CAST(cardnumber AS SIGNED)',
as => ['cast_cardnumber']
}
)->_resultset->get_column('cast_cardnumber')->max;
$self->cardnumber( ( $max || 0 ) + 1 );
# Only auto-generate when no cardnumber has been supplied (directly or by a plugin).
unless ($next) {
my $schema = $self->_result->result_source->schema;
my $pref_rs = $schema->resultset('Systempreference')->search(
{ variable => 'autoMemberNumValue' },
{ for => 'update' },
);
my $pref = $pref_rs->first;
my $counter = ( $pref && $pref->value ) || 0;
my $db_max = Koha::Patrons->search(
{ cardnumber => { -regexp => '^-?[0-9]+$' } },
{
select => \'CAST(cardnumber AS SIGNED)',
as => ['cast_cardnumber'],
}
)->_resultset->get_column('cast_cardnumber')->max
|| 0;
$next = ( $counter > $db_max ? $counter : $db_max ) + 1;
$pref->update( { value => $next } ) if $pref;
}
$self->cardnumber($next);
}
=head3 trim_whitespace