Current File : //data/old/usr/share/perl5/vendor_perl/Net/FTPServer/DBeg1/DirHandle.pm
# -*- perl -*-
# Net::FTPServer A Perl FTP Server
# Copyright (C) 2000 Bibliotech Ltd., Unit 2-3, 50 Carnwath Road,
# London, SW6 3EG, United Kingdom.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
=pod
=head1 NAME
Net::FTPServer::DBeg1::DirHandle - The example DB FTP server personality
=head1 SYNOPSIS
use Net::FTPServer::DBeg1::DirHandle;
=head1 METHODS
=cut
package Net::FTPServer::DBeg1::DirHandle;
use strict;
use vars qw($VERSION);
( $VERSION ) = '$Revision: 1.1 $ ' =~ /\$Revision:\s+([^\s]+)/;
use DBI;
use Carp qw(confess croak);
use Net::FTPServer::DirHandle;
use Net::FTPServer::DBeg1::IOBlob;
use vars qw(@ISA);
@ISA = qw(Net::FTPServer::DirHandle);
# Cached statement handles.
use vars qw($sth1 $sth2 $sth3 $sth4 $sth5 $sth6 $sth7 $sth8 $sth9 $sth10 $sth11 $sth12 $sth13 $sth14 $sth15 $sth16 $sth17 $sth18 $sth19 $sth20);
# Return a new directory handle.
sub new
{
my $class = shift;
my $ftps = shift; # FTP server object.
my $pathname = shift || "/"; # (only used in internal calls)
my $dir_id = shift; # (only used in internal calls)
# Create object.
my $self = Net::FTPServer::DirHandle->new ($ftps, $pathname);
bless $self, $class;
if ($dir_id)
{
$self->{fs_dir_id} = $dir_id;
}
else
{
# Find the root directory ID.
my $sql = "select id from directories where parent_id is null";
$sth6 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth6->execute;
my $row = $sth6->fetch
or die "no root directory in database (has the database been populated?): $!";
$self->{fs_dir_id} = $row->[0];
}
return $self;
}
# Return a subdirectory handle or a file handle within this directory.
sub get
{
my $self = shift;
my $filename = shift;
# None of these cases should ever happen.
confess "no filename" unless defined($filename) && length($filename);
confess "slash filename" if $filename =~ /\//;
confess ".. filename" if $filename eq "..";
confess ". filename" if $filename eq ".";
# Search for the file first, since files are more common than dirs.
my $sql = "select id, content from files where dir_id = ? and name = ?";
$sth1 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth1->execute (int ($self->{fs_dir_id}), $filename);
my $row = $sth1->fetch;
if ($row)
{
# Found a file.
return new Net::FTPServer::DBeg1::FileHandle ($self->{ftps},
$self->pathname . $filename,
$self->{fs_dir_id},
$row->[0], $row->[1],
$row->[2]);
}
# Search for a directory.
$sql = "select id from directories where parent_id = ? and name = ?";
$sth2 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth2->execute (int ($self->{fs_dir_id}), $filename);
$row = $sth2->fetch;
if ($row)
{
# Found a directory.
return new Net::FTPServer::DBeg1::DirHandle ($self->{ftps},
$self->pathname . $filename . "/",
$row->[0]);
}
# Not found.
return undef;
}
# Get parent of current directory.
sub parent
{
my $self = shift;
return $self if $self->is_root;
# Get a new directory handle.
my $dirh = $self->SUPER::parent;
# Find directory ID of the parent directory.
my $sql = "select parent_id from directories where id = ?";
$sth3 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth3->execute (int ($self->{fs_dir_id}));
my $row = $sth3->fetch
or die "directory ID ", $self->{fs_dir_id}, " missing";
$dirh->{fs_dir_id} = $row->[0];
return bless $dirh, ref $self;
}
sub list
{
my $self = shift;
my $wildcard = shift;
# Convert wildcard into a SQL LIKE pattern.
if ($wildcard)
{
if ($wildcard ne "*")
{
$wildcard = $self->{ftps}->wildcard_to_sql_like ($wildcard);
}
else
{
# If wildcard is "*" then it defaults to undefined (for speed).
$wildcard = undef;
}
}
# Get subdirectories.
my ($sql, $sth);
if ($wildcard)
{
$sql = "select id, name from directories
where parent_id = ? and name like ?";
$sth15 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth15->execute (int ($self->{fs_dir_id}), $wildcard);
$sth = $sth15;
}
else
{
$sql = "select id, name from directories where parent_id = ?";
$sth4 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth4->execute (int ($self->{fs_dir_id}));
$sth = $sth4;
}
my @result = ();
my $username = substr $self->{ftps}{user}, 0, 8;
while (my $row = $sth->fetch)
{
my $dirh
= new Net::FTPServer::DBeg1::DirHandle ($self->{ftps},
$self->pathname . $row->[1] . "/",
$row->[0]);
push @result, [ $row->[1], $dirh ];
}
# Get files.
if ($wildcard)
{
$sql = "select id, name, content from files
where dir_id = ? and name like ?";
$sth16 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth16->execute (int ($self->{fs_dir_id}), $wildcard);
$sth = $sth16;
}
else
{
$sql = "select id, name, content from files where dir_id = ?";
$sth5 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth5->execute (int ($self->{fs_dir_id}));
$sth = $sth5;
}
while (my $row = $sth->fetch)
{
my $fileh
= new Net::FTPServer::DBeg1::FileHandle ($self->{ftps},
$self->pathname . $row->[1],
$self->{fs_dir_id},
$row->[0],
$row->[2]);
push @result, [ $row->[1], $fileh ];
}
return \@result;
}
sub list_status
{
my $self = shift;
my $wildcard = shift;
# Convert wildcard into a SQL LIKE pattern.
if ($wildcard)
{
if ($wildcard ne "*")
{
$wildcard = $self->{ftps}->wildcard_to_sql_like ($wildcard);
}
else
{
# If wildcard is "*" then it defaults to undefined (for speed).
$wildcard = undef;
}
}
# Get subdirectories.
my ($sql, $sth);
if ($wildcard)
{
$sql = "select id, name from directories
where parent_id = ? and name like ?";
$sth18 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth18->execute (int ($self->{fs_dir_id}), $wildcard);
$sth = $sth18;
}
else
{
$sql = "select id, name from directories where parent_id = ?";
$sth17 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth17->execute (int ($self->{fs_dir_id}));
$sth = $sth17;
}
my @result = ();
my $username = substr $self->{ftps}{user}, 0, 8;
while (my $row = $sth->fetch)
{
my $dirh
= new Net::FTPServer::DBeg1::DirHandle ($self->{ftps},
$self->pathname . $row->[1] . "/",
$row->[0]);
my @status = $dirh->status;
push @result, [ $row->[1], $dirh, \@status ];
}
# Get files.
if ($wildcard)
{
$sql = "select id, name, content from files
where dir_id = ? and name like ?";
$sth20 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth20->execute (int ($self->{fs_dir_id}), $wildcard);
$sth = $sth20;
}
else
{
$sql = "select id, name, content from files where dir_id = ?";
$sth19 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth19->execute (int ($self->{fs_dir_id}));
$sth = $sth19;
}
while (my $row = $sth->fetch)
{
my $fileh
= new Net::FTPServer::DBeg1::FileHandle ($self->{ftps},
$self->pathname . $row->[1],
$self->{fs_dir_id},
$row->[0],
$row->[2]);
my @status = $fileh->status;
push @result, [ $row->[1], $fileh, \@status ];
}
return \@result;
}
# Return the status of this directory.
sub status
{
my $self = shift;
my $username = substr $self->{ftps}{user}, 0, 8;
return ( 'd', 0755, 1, $username, "users", 1024, 0 );
}
# Move a directory to elsewhere.
sub move
{
my $self = shift;
my $dirh = shift;
my $filename = shift;
# You can't move the root directory. That would be bad :-)
return -1 if $self->is_root;
my $sql = "update directories set parent_id = ?, name = ? where id = ?";
$sth12 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth12->execute (int ($dirh->{fs_dir_id}), $filename,
int ($self->{fs_dir_id}));
return 0;
}
# We should only be able to delete a directory if the directory
# is empty. Postgres >= 6.5 can check this using referential
# constraints. However, I'm using Postgres 6.4, so instead I have
# to check the constraints by hand before allowing the delete.
sub delete
{
my $self = shift;
# Check referential constraints.
my $sql = "select count(id) from files where dir_id = ?";
$sth7 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth7->execute (int ($self->{fs_dir_id}));
my $row = $sth7->fetch or die "no rows returned from count";
my $nr_files = $row->[0];
$sql = "select count(id) from directories where parent_id = ?";
$sth8 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth8->execute (int ($self->{fs_dir_id}));
$row = $sth8->fetch or die "no rows returned from count";
my $nr_dirs = $row->[0];
return -1 if $nr_files > 0 || $nr_dirs > 0;
# Delete the directory.
$sql = "delete from directories where id = ?";
$sth9 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth9->execute (int ($self->{fs_dir_id}));
return 0;
}
# Create a subdirectory.
sub mkdir
{
my $self = shift;
my $dirname = shift;
my $sql = "insert into directories (parent_id, name)
values (?, ?)";
$sth10 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth10->execute (int ($self->{fs_dir_id}), $dirname);
return 0;
}
# Open or create a file in this directory.
sub open
{
my $self = shift;
my $filename = shift;
my $mode = shift;
if ($mode eq "r") # Open an existing file for reading.
{
my $sql = "select content from files where dir_id = ? and name = ?";
$sth11 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth11->execute (int ($self->{fs_dir_id}), $filename);
my $row = $sth11->fetch or return undef;
return new Net::FTPServer::DBeg1::IOBlob ('r', $self->{ftps}{fs_dbh}, $row->[0]);
}
elsif ($mode eq "w") # Create/overwrite the file.
{
my $dbh = $self->{ftps}{fs_dbh};
my $blob_id = $dbh->func ($dbh->{pg_INV_WRITE}|$dbh->{pg_INV_READ},
'lo_creat');
# Insert it into the database.
my $sql = "insert into files (name, dir_id, content) values (?, ?, ?)";
$sth14 ||= $dbh->prepare ($sql);
$sth14->execute ($filename, int ($self->{fs_dir_id}), $blob_id);
return new Net::FTPServer::DBeg1::IOBlob ('w', $self->{ftps}{fs_dbh}, $blob_id);
}
elsif ($mode eq "a") # Append to the file.
{
my $sql = "select content from files where dir_id = ? and name = ?";
$sth13 ||= $self->{ftps}{fs_dbh}->prepare ($sql);
$sth13->execute (int ($self->{fs_dir_id}), $filename);
my $row = $sth13->fetch or return undef;
return new Net::FTPServer::DBeg1::IOBlob ('w', $self->{ftps}{fs_dbh}, $row->[0]);
}
else
{
croak "unknown file mode: $mode; use 'r', 'w' or 'a' instead";
}
}
1 # So that the require or use succeeds.
__END__
=head1 AUTHORS
Richard Jones (rich@annexia.org).
=head1 COPYRIGHT
Copyright (C) 2000 Biblio@Tech Ltd., Unit 2-3, 50 Carnwath Road,
London, SW6 3EG, UK
=head1 SEE ALSO
C<Net::FTPServer(3)>, C<perl(1)>
=cut
Mini Shell