/usr/lib/x86_64-linux-gnu/perl5/5.22/Embperl/Session.pm is in libembperl-perl 2.5.0-6.
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#
# HTML::Embperl::Session
# A bridge between Apache::Session and Embperl's %udat hash
# Copyright(c) 1999 Gerald Richter (richter@ecos.de)
# Copyright(c) 1998, 1999 Jeffrey William Baker (jeffrey@kathyandjeffrey.net)
# Distribute under the Artistic License
#
#############################################################################
=head1 NAME
HTML::Embperl::Session - adaptation of Apache::Session to work with HTML::Embperl
=head1 DESCRIPTION
An adaptation of Apache::Session to work with HTML::Embperl
=head1 SYNOPSIS
=head2 Addtional Attributes for TIE
=over 4
=item lazy
By Specifyng this attribute, you tell Apache::Session to not do any
access to the object store, until the first read or write access to
the tied hash. Otherwise the B<tie> function will make sure the hash
exist or creates a new one.
=item create_unknown
Setting this to one causes Apache::Session to create a new session
with the given id (or a new id, depending on C<recreate_id>)
when the specified session id does not exists. Otherwise it will die.
=item recreate_id
Setting this to one causes Apache::Session to create a new session id
when the specified session id does not exists.
=item object_store
Specify the class for the object store. (The Apache::Session:: prefix is
optional) Only for Apache::Session 1.00.
=item lock_manager
Specify the class for the lock manager. (The Apache::Session:: prefix is
optional) Only for Apache::Session 1.00.
=item Store
Specify the class for the object store. (The Apache::Session::Store prefix is
optional) Only for Apache::Session 1.5x.
=item Lock
Specify the class for the lock manager. (The Apache::Session::Lock prefix is
optional) Only for Apache::Session 1.5x.
=item Generate
Specify the class for the id generator. (The Apache::Session::Generate prefix is
optional) Only for Apache::Session 1.5x.
=item Serialize
Specify the class for the data serializer. (The Apache::Session::Serialize prefix is
optional) Only for Apache::Session 1.5x.
=back
Example using attrubtes to specfiy store and object classes instead of
a derived class:
use HTML::Embperl::Session;
tie %session, 'HTML::Embperl::Session', undef,
{
object_store => 'DBIStore',
lock_manager => 'SysVSemaphoreLocker',
DataSource => 'dbi:Oracle:db'
};
NOTE: HTML::Embperl::Session will require the nessecary additional perl modules for you.
=head2 Addtional Methods
=over 4
=item setid
Set the session id for futher accesses.
=item getid
Get the session id. The difference to using $session{_session_id} is,
that in lazy mode, getid will B<not> create a new session id, if it
doesn't exists.
=item cleanup
Writes any pending data, releases all locks and deletes all data from memory.
=back
=head1 AUTHORS
Gerald Richter <richter at embperl dot org> is the current maintainer.
This class was written by Jeffrey Baker (jeffrey@kathyandjeffrey.net)
but it is taken wholesale from a patch that Gerald Richter
(richter@ecos.de) sent me against Apache::Session.
=cut
package HTML::Embperl::Session;
use strict;
use vars qw(@ISA $VERSION);
$VERSION = '2.0.0';
@ISA = qw(Apache::Session);
use Apache::Session;
use constant NEW => Apache::Session::NEW () ;
use constant MODIFIED => Apache::Session::MODIFIED () ;
use constant DELETED => Apache::Session::DELETED () ;
use constant SYNCED => Apache::Session::SYNCED () ;
sub TIEHASH {
my $class = shift;
my $session_id = shift;
my $args = shift || {};
if(ref $args ne "HASH")
{
die "Additional arguments should be in the form of a hash reference";
}
#Set-up the data structure and make it an object
#of our class
#$args -> {IDLength} ||= 32 ;
my $self =
{
args => $args,
data => { _session_id => $session_id },
initial_session_id => $session_id,
lock => 0,
lock_manager => undef,
object_store => undef,
status => 0,
serialized => undef,
};
bless $self, $class;
$self -> require_modules ($args) ;
$self -> init if (!$args -> {'lazy'}) ;
return $self ;
}
sub require_modules
{
my $self = shift ;
my $args = shift ;
# check object_store and lock_manager classes (Apache::Session 1.00)
if ($args -> {'object_store'})
{
$args -> {'object_store'} = "Apache::Session::$args->{'object_store'}" if (!($args -> {'object_store'} =~ /::/)) ;
eval "require $args->{'object_store'}" ;
die "Cannot require $args->{'object_store'}" if ($@) ;
}
if ($args -> {'lock_manager'})
{
$args -> {'lock_manager'} = "Apache::Session::$args->{'lock_manager'}" if (!($args -> {'lock_manager'} =~ /::/)) ;
eval "require $args->{'lock_manager'}" ;
die "Cannot require $args->{'lock_manager'}" if ($@) ;
}
# check Store, Lock, Generate, Serialize classes (Apache::Session 1.5x)
if ($args -> {'Store'})
{
$args -> {'Store'} = "Apache::Session::Store::$args->{'Store'}" if (!($args -> {'Store'} =~ /::/)) ;
eval "require $args->{'Store'}" ;
die "Cannot require $args->{'Store'}" if ($@) ;
}
if ($args -> {'Lock'})
{
$args -> {'Lock'} = "Apache::Session::Lock::$args->{'Lock'}" if (!($args -> {'Lock'} =~ /::/)) ;
eval "require $args->{'Lock'}" ;
die "Cannot require $args->{'Lock'}" if ($@) ;
}
if ($args -> {'Generate'})
{
$args -> {'Generate'} = "Apache::Session::Generate::$args->{'Generate'}" if (!($args -> {'Generate'} =~ /::/)) ;
eval "require $args->{'Generate'}" ;
die "Cannot require $args->{'Generate'}" if ($@) ;
}
if ($args -> {'Serialize'})
{
$args -> {'Serialize'} = "Apache::Session::Serialize::$args->{'Serialize'}" if (!($args -> {'Serialize'} =~ /::/)) ;
eval "require $args->{'Serialize'}" ;
die "Cannot require $args->{'Serialize'}" if ($@) ;
}
}
sub init
{
my $self = shift ;
#If a session ID was passed in, this is an old hash.
#If not, it is a fresh one.
my $session_id = $self->{data}->{_session_id} ;
if (!$session_id && $self -> {idfrom})
{
$session_id = $self->{data}->{_session_id} = &{$self->{generate}}($self, $self -> {idfrom}) ;
}
$self->{initial_session_id} ||= $session_id ;
$self->populate;
if (defined $session_id && $session_id)
{
#check the session ID for remote exploitation attempts
#this will die() on suspicious session IDs.
eval { &{$self->{validate}}($self); } ;
if (!$@)
{ # session id is ok
if (exists $self -> {'args'}->{Transaction} && $self -> {'args'}->{Transaction})
{
$self->acquire_write_lock;
}
$self->{status} &= ($self->{status} ^ NEW);
if ($self -> {'args'}{'create_unknown'})
{
eval { $self -> restore } ;
#warn "Try to load session: $@" if ($@) ;
$@ = "" ;
$session_id = $self->{data}->{_session_id} ;
}
else
{
$self->restore;
}
}
}
$@ = '' ;
if (!($self->{status} & SYNCED))
{
$self->{status} |= NEW();
if (!$self->{data}->{_session_id} || $self -> {'args'}{'recreate_id'})
{
if (exists ($self->{generate}))
{ # Apache::Session >= 1.50
$self->{data}->{_session_id} = &{$self->{generate}}($self) ;
}
else
{
$self->{data}->{_session_id} = $self -> generate_id() ;
}
}
$self->save;
}
#warn "Session INIT $self->{initial_session_id};$self->{data}->{_session_id};" ;
return $self;
}
sub FETCH {
my $self = shift;
my $key = shift;
$self -> init if (!$self -> {'status'}) ;
return $self->{data}->{$key};
}
sub STORE {
my $self = shift;
my $key = shift;
my $value = shift;
$self -> init if (!$self -> {'status'}) ;
$self->{data}->{$key} = $value;
$self->{status} |= MODIFIED;
return $self->{data}->{$key};
}
sub DELETE {
my $self = shift;
my $key = shift;
$self -> init if (!$self -> {'status'}) ;
$self->{status} |= MODIFIED;
delete $self->{data}->{$key};
}
sub CLEAR {
my $self = shift;
$self -> init if (!$self -> {'status'}) ;
$self->{status} |= MODIFIED;
$self->{data} = {};
}
sub EXISTS {
my $self = shift;
my $key = shift;
$self -> init if (!$self -> {'status'}) ;
return exists $self->{data}->{$key};
}
sub FIRSTKEY {
my $self = shift;
$self -> init if (!$self -> {'status'}) ;
my $reset = keys %{$self->{data}};
return each %{$self->{data}};
}
sub NEXTKEY {
my $self = shift;
$self -> init if (!$self -> {'status'}) ;
return each %{$self->{data}};
}
sub DESTROY {
my $self = shift;
return if (!$self -> {'status'}) ;
$self->save;
$self->release_all_locks;
}
sub cleanup
{
my $self = shift;
$self->{initial_session_id} = undef ;
if (!$self -> {'status'})
{
$self->{data} = {} ;
$self->{serialized} = undef ;
return ;
}
$self->save;
{
local $SIG{__WARN__} = 'IGNORE' ;
local $SIG{__DIE__} = 'IGNORE' ;
eval { $self -> {object_store} -> close } ; # Try to close file storage
$@ = "" ;
}
$self->release_all_locks;
$self->{'status'} = 0 ;
$self->{data} = {} ;
$self->{serialized} = undef ;
}
sub setid {
my $self = shift;
$self->{'status'} = 0 ;
$self->{data}->{_session_id} = $self->{initial_session_id} = shift ;
}
sub setidfrom {
my $self = shift;
$self->{'status'} = 0 ;
$self->{data}->{_session_id} = $self->{initial_session_id} = undef ;
$self->{idfrom} = shift ;
}
sub getid {
my $self = shift;
return $self->{data}->{_session_id} || $self->{'ID'} ;
}
sub getids {
my $self = shift;
return ($self->{initial_session_id}, $self->{data}->{_session_id} || $self->{'ID'}, $self->{status} & MODIFIED) ;
}
sub delete {
my $self = shift;
return if ($self->{status} & NEW);
$self->{initial_session_id} = "!DELETE" ;
$self -> init if (!$self -> {'status'}) ;
$self->{status} |= DELETED;
$self->save;
$self->{data} = {} ; # Throw away the data
}
#
# For Apache::Session 1.00
#
sub get_object_store {
my $self = shift;
return new {$self -> {'args'}{'object_store'}} $self;
}
sub get_lock_manager {
my $self = shift;
return new {$self -> {'args'}{'lock_manager'}} $self;
}
#
# Default validate for Apache::Session < 1.53
#
sub validate {
#This routine checks to ensure that the session ID is in the form
#we expect. This must be called before we start diddling around
#in the database or the disk.
my $session = shift;
if ($session->{data}->{_session_id} !~ /^[a-fA-F0-9]+$/) {
die;
}
}
#
# For Apache::Session >= 1.50
#
sub populate
{
my $self = shift;
my $store = $self->{args}->{Store};
my $lock = $self->{args}->{Lock};
my $gen = $self->{args}->{Generate};
my $ser = $self->{args}->{Serialize};
$self->{object_store} = new $store $self if ($store) ;
$self->{lock_manager} = new $lock $self if ($lock);
$self->{generate} = \&{$gen . '::generate'} if ($gen);
$self->{'validate'} = \&{$gen . '::validate'} if ($gen && defined (&{$gen . '::validate'}));
$self->{serialize} = \&{$ser . '::serialize'} if ($ser);
$self->{unserialize} = \&{$ser . '::unserialize'} if ($ser) ;
if (!defined ($self->{'validate'}))
{
$self->{'validate'} = \&validate ;
}
return $self;
}
1 ;
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