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lib/Apache2/ASP/SessionStateManager.pm  view on Meta::CPAN

package Apache2::ASP::SessionStateManager;

use strict;
use warnings 'all';
use base 'Ima::DBI';
use Digest::MD5 'md5_hex';
use Storable qw( freeze thaw );
use HTTP::Date qw( time2iso str2time );
use Scalar::Util 'weaken';


#==============================================================================
sub new
{
  my ($class, %args) = @_;
  
  my $s = bless {}, $class;
  my $conn = $s->context->config->data_connections->session;
  
  local $^W = 0;
  __PACKAGE__->set_db('Main',
    $conn->dsn,
    $conn->username,
    $conn->password
  );
  
  # Prepare our Session:
  if( my $id = $s->parse_session_id() )
  {
    if( $s->verify_session_id( $id ) )
    {
      $s->{SessionID} = $id;
      return $s->retrieve( $id );
    }
    else
    {
      $s->{SessionID} = $s->new_session_id();
      $s->write_session_cookie();
      return $s->create( $s->{SessionID} );
    }# end if()
  }
  else
  {
    $s->{SessionID} = $s->new_session_id();
    $s->write_session_cookie();
    return $s->create( $s->{SessionID} );
  }# end if()
}# end new()


#==============================================================================
sub context
{
  $Apache2::ASP::HTTPContext::ClassName->current;
}# end context()


#==============================================================================
sub parse_session_id
{
  my ($s) = @_;
  
  my $cookiename = $s->context->config->data_connections->session->cookie_name;

  no warnings 'uninitialized';
  if( my ($id) = $ENV{HTTP_COOKIE} =~ m/$cookiename\=([a-f0-9]+)/ )
  {
    return $id;
  }

lib/Apache2/ASP/SessionStateManager.pm  view on Meta::CPAN

    VALUES (
      ?, ?, ?, ?
    )

  my $now = time2iso();
  
  no warnings 'uninitialized';
  $s->{__signature} = md5_hex(
    join ":", 
      map { "$_:$s->{$_}" }
        grep { $_ ne '__signature' } sort keys(%$s)
  );
  
  my %clone = %$s;
  
  $sth->execute(
    $id,
    freeze( \%clone ),
    $now,
    $now,
  );
  $sth->finish();
  
  return $s->retrieve( $id );
}# end create()


#==============================================================================
sub retrieve
{
  my ($s, $id) = @_;
  
  local $s->db_Main->{AutoCommit} = 1;
  my $sth = $s->db_Main->prepare_cached(<<"");
    SELECT session_data, modified_on
    FROM asp_sessions
    WHERE session_id = ?

  my $now = time2iso();
  $sth->execute( $id );
  my ($data, $modified_on) = $sth->fetchrow;
  $data = thaw($data) || { SessionID => $id };
  $sth->finish();

  my $seconds_since_last_modified = time() - str2time($modified_on);
  my $timeout_seconds = $s->context->config->data_connections->session->session_timeout * 60;
  if( $seconds_since_last_modified >= 1 && $seconds_since_last_modified < $timeout_seconds )
  {
    local $s->db_Main->{AutoCommit} = 1;
    my $sth = $s->db_Main->prepare_cached(<<"");
    UPDATE asp_sessions SET
      modified_on = ?
    WHERE session_id = ?

    $sth->execute( time2iso(), $id );
    $sth->finish();
  }# end if()
  
  undef(%$s);
  $s = bless $data, ref($s);
  weaken($s);
  
  no warnings 'uninitialized';
  
  my @keys = sort keys(%$s);
  
  my $sig = md5_hex(
    join ":",
      map { "$_:$s->{$_}" } 
        grep { $_ ne '__signature' } @keys
  );
  
  $s->{__signature} = $sig;
  
  return $s;
}# end retrieve()


#==============================================================================
sub save
{
  my ($s) = @_;
  
  no warnings 'uninitialized';
  return if $s->{__signature} eq md5_hex(
    join ":", map { "$_:$s->{$_}" }
                grep { $_ ne '__signature' } sort keys(%$s)
  );
  $s->{__signature} = md5_hex(
    join ":",
      map { "$_:$s->{$_}" } 
        grep { $_ ne '__signature' } sort keys(%$s)
  );
  
  local $s->db_Main->{AutoCommit} = 1;
  my $sth = $s->db_Main->prepare_cached(<<"");
    UPDATE asp_sessions SET
      session_data = ?,
      modified_on = ?
    WHERE session_id = ?

  my %clone = %$s;
  my $data = freeze( \%clone );
  $sth->execute( $data, time2iso(), $s->{SessionID} );
  $sth->finish();
  
  1;
}# end save()


#=========================================================================
sub reset
{
  my ($s) = @_;
  
  # Remove everything *but* our important parts:
  my %saves = map { $_ => 1 } qw/ SessionID /;
  delete( $s->{$_} ) foreach grep { ! $saves{$_} } keys(%$s);
  $s->save;
}# end reset()