Bug 28317: Use the default CGI::Session serializer

We remove YAML::Syck on bug 22824 and YAML on 27673, to use YAML::XS.
However we need one of them for CGI::Session::Serialize::yaml
It's preferable to change the serializer and use the default one instead
of writing one based on YAML::XS (or patch the existing ::yaml that does
not seem maintained).

There was an encoding bug reported on the default serializer (see commit
a858e8a8b8) but we fail to recreate it.

Test plan:
Create 3 libraries with branchcode=branchname: "CPL", "ÄÄÄ~ÄãÃ" and "✔️ ❤️ ★"
Use the 3 options of SessionStorage and switch from one logged in
library to another.
Confirm that everything is working correctly (ie. no ending issue in the
library name at the top-right corner)

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

C4/Auth.pm

@@ -1850,21 +1850,21 @@ sub _get_session_params {
     my $storage_method = C4::Context->preference('SessionStorage');
     if ( $storage_method eq 'mysql' ) {
         my $dbh = C4::Context->dbh;
-        return { dsn => "driver:MySQL;serializer:yaml;id:md5", dsn_args => { Handle => $dbh } };
+        return { dsn => "driver:MySQL;id:md5", dsn_args => { Handle => $dbh } };
     }
     elsif ( $storage_method eq 'Pg' ) {
         my $dbh = C4::Context->dbh;
-        return { dsn => "driver:PostgreSQL;serializer:yaml;id:md5", dsn_args => { Handle => $dbh } };
+        return { dsn => "driver:PostgreSQL;id:md5", dsn_args => { Handle => $dbh } };
     }
     elsif ( $storage_method eq 'memcached' && Koha::Caches->get_instance->memcached_cache ) {
         my $memcached = Koha::Caches->get_instance()->memcached_cache;
-        return { dsn => "driver:memcached;serializer:yaml;id:md5", dsn_args => { Memcached => $memcached } };
+        return { dsn => "driver:memcached;id:md5", dsn_args => { Memcached => $memcached } };
     }
     else {
         # catch all defaults to tmp should work on all systems
         my $dir = C4::Context::temporary_directory;
         my $instance = C4::Context->config( 'database' ); #actually for packages not exactly the instance name, but generally safer to leave it as it is
-        return { dsn => "driver:File;serializer:yaml;id:md5", dsn_args => { Directory => "$dir/cgisess_$instance" } };
+        return { dsn => "driver:File;id:md5", dsn_args => { Directory => "$dir/cgisess_$instance" } };
     }
 }
 

C4/Context.pm

@@ -745,9 +745,13 @@ set_userenv is called in Auth.pm
 #'
 sub set_userenv {
     shift @_;
-    my ($usernum, $userid, $usercnum, $userfirstname, $usersurname, $userbranch, $branchname, $userflags, $emailaddress, $shibboleth, $desk_id, $desk_name, $register_id, $register_name)=
-    map { Encode::is_utf8( $_ ) ? $_ : Encode::decode('UTF-8', $_) } # CGI::Session doesn't handle utf-8, so we decode it here
-    @_;
+    my (
+        $usernum,      $userid,     $usercnum,   $userfirstname,
+        $usersurname,  $userbranch, $branchname, $userflags,
+        $emailaddress, $shibboleth, $desk_id,    $desk_name,
+        $register_id,  $register_name
+    ) = @_;
+
     my $var=$context->{"activeuser"} || '';
     my $cell = {
         "number"     => $usernum,

C4/InstallAuth.pm

@@ -243,7 +243,7 @@ sub checkauth {
     if ( $sessionID = $query->cookie("CGISESSID") ) {
         C4::Context->_new_userenv($sessionID);
         my $session =
-          CGI::Session->new( "driver:File;serializer:yaml", $sessionID,
+          CGI::Session->new( "driver:File", $sessionID,
             { Directory => $sessdir } );
         if ( $session->param('cardnumber') ) {
             C4::Context->set_userenv(
@@ -283,7 +283,7 @@ sub checkauth {
     }
     unless ($userid) {
         my $session =
-          CGI::Session->new( "driver:File;serializer:yaml", undef, { Directory => $sessdir } );
+          CGI::Session->new( "driver:File", undef, { Directory => $sessdir } );
         $sessionID = $session->id;
         $userid    = $query->param('userid');
         C4::Context->_new_userenv($sessionID);

cpanfile

@@ -10,7 +10,6 @@ requires 'CGI::Carp', '1.29';
 requires 'CGI::Compile', '>= 0.17, != 0.24';
 requires 'CGI::Emulate::PSGI', '0.20';
 requires 'CGI::Session', '4.2';
-requires 'CGI::Session::Serialize::yaml', '4.2';
 requires 'CPAN::Meta', '2.150006';
 requires 'Cache::Memcached', '1.30';
 requires 'Cache::Memcached::Fast::Safe', '0.06';