# Net::POP3.pm

#

# Copyright (c) 1995-1997 Graham Barr <gbarr@pobox.com>. All rights reserved.

# This program is free software; you can redistribute it and/or

# modify it under the same terms as Perl itself.

package Net::POP3;

use strict;

use IO::Socket;

use vars qw(@ISA $VERSION $debug);

use Net::Cmd;

use Carp;

use Net::Config;

$VERSION = "2.24"; # $Id: //depot/libnet/Net/POP3.pm#24 $

@ISA = qw(Net::Cmd IO::Socket::INET);

sub new

{

 my $self = shift;

 my $type = ref($self) || $self;

 my $host = shift if @_ % 2;

 my %arg  = @_; 

 my $hosts = defined $host ? [ $host ] : $NetConfig{pop3_hosts};

 my $obj;

 my @localport = exists $arg{ResvPort} ? ( LocalPort => $arg{ResvPort} ): ();

 my $h;

 foreach $h (@{$hosts})

  {

   $obj = $type->SUPER::new(PeerAddr => ($host = $h), 

			    PeerPort => $arg{Port} || 'pop3(110)',

			    Proto    => 'tcp',

			    @localport,

			    Timeout  => defined $arg{Timeout}

						? $arg{Timeout}

						: 120

			   ) and last;

  }

 return undef

	unless defined $obj;

 ${*$obj}{'net_pop3_host'} = $host;

 $obj->autoflush(1);

 $obj->debug(exists $arg{Debug} ? $arg{Debug} : undef);

 unless ($obj->response() == CMD_OK)

  {

   $obj->close();

   return undef;

  }

 ${*$obj}{'net_pop3_banner'} = $obj->message;

 $obj;

}

##

## We don't want people sending me their passwords when they report problems

## now do we :-)

##

sub debug_text { $_[2] =~ /^(pass|rpop)/i ? "$1 ....\n" : $_[2]; }

sub login

{

 @_ >= 1 && @_ <= 3 or croak 'usage: $pop3->login( USER, PASS )';

 my($me,$user,$pass) = @_;

 if (@_ <= 2) {

   ($user, $pass) = $me->_lookup_credentials($user);

 }

 $me->user($user) and

    $me->pass($pass);

}

sub apop

{

 @_ >= 1 && @_ <= 3 or croak 'usage: $pop3->apop( USER, PASS )';

 my($me,$user,$pass) = @_;

 my $banner;

 my $md;

 if (eval { local $SIG{__DIE__}; require Digest::MD5 }) {

   $md = Digest::MD5->new();

 } elsif (eval { local $SIG{__DIE__}; require MD5 }) {

   $md = MD5->new();

 } else {

   carp "You need to install Digest::MD5 or MD5 to use the APOP command";

   return undef;

 }

 return undef

   unless ( $banner = (${*$me}{'net_pop3_banner'} =~ /(<.*>)/)[0] );

 if (@_ <= 2) {

   ($user, $pass) = $me->_lookup_credentials($user);

 }

 $md->add($banner,$pass);

 return undef

    unless($me->_APOP($user,$md->hexdigest));

 $me->_get_mailbox_count();

}

sub user

{

 @_ == 2 or croak 'usage: $pop3->user( USER )';

 $_[0]->_USER($_[1]) ? 1 : undef;

}

sub pass

{

 @_ == 2 or croak 'usage: $pop3->pass( PASS )';

 my($me,$pass) = @_;

 return undef

   unless($me->_PASS($pass));

 $me->_get_mailbox_count();

}

sub reset

{

 @_ == 1 or croak 'usage: $obj->reset()';

 my $me = shift;

 return 0 

   unless($me->_RSET);

 if(defined ${*$me}{'net_pop3_mail'})

  {

   local $_;

   foreach (@{${*$me}{'net_pop3_mail'}})

    {

     delete $_->{'net_pop3_deleted'};

    }

  }

}

sub last

{

 @_ == 1 or croak 'usage: $obj->last()';

 return undef

    unless $_[0]->_LAST && $_[0]->message =~ /(\d+)/;

 return $1;

}

sub top

{

 @_ == 2 || @_ == 3 or croak 'usage: $pop3->top( MSGNUM [, NUMLINES ])';

 my $me = shift;

 return undef

    unless $me->_TOP($_[0], $_[1] || 0);

 $me->read_until_dot;

}

sub popstat

{

 @_ == 1 or croak 'usage: $pop3->popstat()';

 my $me = shift;

 return ()

    unless $me->_STAT && $me->message =~ /(\d+)\D+(\d+)/;

 ($1 || 0, $2 || 0);

}

sub list

{

 @_ == 1 || @_ == 2 or croak 'usage: $pop3->list( [ MSGNUM ] )';

 my $me = shift;

 return undef

    unless $me->_LIST(@_);

 if(@_)

  {

   $me->message =~ /\d+\D+(\d+)/;

   return $1 || undef;

  }

 my $info = $me->read_until_dot

	or return undef;

 my %hash = map { (/(\d+)\D+(\d+)/) } @$info;

 return \%hash;

}

sub get

{

 @_ == 2 or @_ == 3 or croak 'usage: $pop3->get( MSGNUM [, FH ])';

 my $me = shift;

 return undef

    unless $me->_RETR(shift);

 $me->read_until_dot(@_);

}

sub getfh

{

 @_ == 2 or croak 'usage: $pop3->getfh( MSGNUM )';

 my $me = shift;

 return unless $me->_RETR(shift);

 return        $me->tied_fh;

}

sub delete

{

 @_ == 2 or croak 'usage: $pop3->delete( MSGNUM )';

 $_[0]->_DELE($_[1]);

}

sub uidl

{

 @_ == 1 || @_ == 2 or croak 'usage: $pop3->uidl( [ MSGNUM ] )';

 my $me = shift;

 my $uidl;

 $me->_UIDL(@_) or

    return undef;

 if(@_)

  {

   $uidl = ($me->message =~ /\d+\s+([\041-\176]+)/)[0];

  }

 else

  {

   my $ref = $me->read_until_dot

	or return undef;

   my $ln;

   $uidl = {};

   foreach $ln (@$ref) {

     my($msg,$uid) = $ln =~ /^\s*(\d+)\s+([\041-\176]+)/;

     $uidl->{$msg} = $uid;

   }

  }

 return $uidl;

}

sub ping

{

 @_ == 2 or croak 'usage: $pop3->ping( USER )';

 my $me = shift;

 return () unless $me->_PING(@_) && $me->message =~ /(\d+)\D+(\d+)/;

 ($1 || 0, $2 || 0);

}

sub _lookup_credentials

{

  my ($me, $user) = @_;

  require Net::Netrc;

  $user ||= eval { local $SIG{__DIE__}; (getpwuid($>))[0] } ||

    $ENV{NAME} || $ENV{USER} || $ENV{LOGNAME};

  my $m = Net::Netrc->lookup(${*$me}{'net_pop3_host'},$user);

  $m ||= Net::Netrc->lookup(${*$me}{'net_pop3_host'});

  my $pass = $m ? $m->password || ""

                : "";

  ($user, $pass);

}

sub _get_mailbox_count

{

  my ($me) = @_;

  my $ret = ${*$me}{'net_pop3_count'} = ($me->message =~ /(\d+)\s+message/io)

	  ? $1 : ($me->popstat)[0];

  $ret ? $ret : "0E0";

}

sub _STAT { shift->command('STAT')->response() == CMD_OK }

sub _LIST { shift->command('LIST',@_)->response() == CMD_OK }

sub _RETR { shift->command('RETR',$_[0])->response() == CMD_OK }

sub _DELE { shift->command('DELE',$_[0])->response() == CMD_OK }

sub _NOOP { shift->command('NOOP')->response() == CMD_OK }

sub _RSET { shift->command('RSET')->response() == CMD_OK }

sub _QUIT { shift->command('QUIT')->response() == CMD_OK }

sub _TOP  { shift->command('TOP', @_)->response() == CMD_OK }

sub _UIDL { shift->command('UIDL',@_)->response() == CMD_OK }

sub _USER { shift->command('USER',$_[0])->response() == CMD_OK }

sub _PASS { shift->command('PASS',$_[0])->response() == CMD_OK }

sub _APOP { shift->command('APOP',@_)->response() == CMD_OK }

sub _PING { shift->command('PING',$_[0])->response() == CMD_OK }

sub _RPOP { shift->command('RPOP',$_[0])->response() == CMD_OK }

sub _LAST { shift->command('LAST')->response() == CMD_OK }

sub quit

{

 my $me = shift;

 $me->_QUIT;

 $me->close;

}

sub DESTROY

{

 my $me = shift;

 if(defined fileno($me))

  {

   $me->reset;

   $me->quit;

  }

}

##

## POP3 has weird responses, so we emulate them to look the same :-)

##

sub response

{

 my $cmd = shift;

 my $str = $cmd->getline() || return undef;

 my $code = "500";

 $cmd->debug_print(0,$str)

   if ($cmd->debug);

 if($str =~ s/^\+OK\s*//io)

  {

   $code = "200"

  }

 else

  {

   $str =~ s/^-ERR\s*//io;

  }

 ${*$cmd}{'net_cmd_resp'} = [ $str ];

 ${*$cmd}{'net_cmd_code'} = $code;

 substr($code,0,1);

}

1;

__END__

=head1 NAME

Net::POP3 - Post Office Protocol 3 Client class (RFC1939)

=head1 SYNOPSIS

    use Net::POP3;

    # Constructors

    $pop = Net::POP3->new('pop3host');

    $pop = Net::POP3->new('pop3host', Timeout => 60);

    if ($pop->login($username, $password) > 0) {

      my $msgnums = $pop->list; # hashref of msgnum => size

      foreach my $msgnum (keys %$msgnums) {

        my $msg = $pop->get($msgnum);

        print @$msg;

        $pop->delete($msgnum);

      }

    }

    $pop->quit;

=head1 DESCRIPTION

This module implements a client interface to the POP3 protocol, enabling

a perl5 application to talk to POP3 servers. This documentation assumes

that you are familiar with the POP3 protocol described in RFC1939.

A new Net::POP3 object must be created with the I<new> method. Once

this has been done, all POP3 commands are accessed via method calls

on the object.

=head1 CONSTRUCTOR

=over 4

=item new ( [ HOST, ] [ OPTIONS ] )

This is the constructor for a new Net::POP3 object. C<HOST> is the

name of the remote host to which a POP3 connection is required.

If C<HOST> is not given, then the C<POP3_Host> specified in C<Net::Config>

will be used.

C<OPTIONS> are passed in a hash like fashion, using key and value pairs.

Possible options are:

B<ResvPort> - If given then the socket for the C<Net::POP3> object

will be bound to the local port given using C<bind> when the socket is

created.

B<Timeout> - Maximum time, in seconds, to wait for a response from the

POP3 server (default: 120)

B<Debug> - Enable debugging information

=back

=head1 METHODS

Unless otherwise stated all methods return either a I<true> or I<false>

value, with I<true> meaning that the operation was a success. When a method

states that it returns a value, failure will be returned as I<undef> or an

empty list.

=over 4

=item user ( USER )

Send the USER command.

=item pass ( PASS )

Send the PASS command. Returns the number of messages in the mailbox.

=item login ( [ USER [, PASS ]] )

Send both the USER and PASS commands. If C<PASS> is not given the

C<Net::POP3> uses C<Net::Netrc> to lookup the password using the host

and username. If the username is not specified then the current user name

will be used.

Returns the number of messages in the mailbox. However if there are no

messages on the server the string C<"0E0"> will be returned. This is

will give a true value in a boolean context, but zero in a numeric context.

If there was an error authenticating the user then I<undef> will be returned.

=item apop ( [ USER [, PASS ]] )

Authenticate with the server identifying as C<USER> with password C<PASS>.

Similar to L</login>, but the password is not sent in clear text.

To use this method you must have the Digest::MD5 or the MD5 module installed,

otherwise this method will return I<undef>.

=item top ( MSGNUM [, NUMLINES ] )

Get the header and the first C<NUMLINES> of the body for the message

C<MSGNUM>. Returns a reference to an array which contains the lines of text

read from the server.

=item list ( [ MSGNUM ] )

If called with an argument the C<list> returns the size of the message

in octets.

If called without arguments a reference to a hash is returned. The

keys will be the C<MSGNUM>'s of all undeleted messages and the values will

be their size in octets.

=item get ( MSGNUM [, FH ] )

Get the message C<MSGNUM> from the remote mailbox. If C<FH> is not given

then get returns a reference to an array which contains the lines of

text read from the server. If C<FH> is given then the lines returned

from the server are printed to the filehandle C<FH>.

=item getfh ( MSGNUM )

As per get(), but returns a tied filehandle.  Reading from this

filehandle returns the requested message.  The filehandle will return

EOF at the end of the message and should not be reused.

=item last ()

Returns the highest C<MSGNUM> of all the messages accessed.

=item popstat ()

Returns a list of two elements. These are the number of undeleted

elements and the size of the mbox in octets.

=item ping ( USER )

Returns a list of two elements. These are the number of new messages

and the total number of messages for C<USER>.

=item uidl ( [ MSGNUM ] )

Returns a unique identifier for C<MSGNUM> if given. If C<MSGNUM> is not

given C<uidl> returns a reference to a hash where the keys are the

message numbers and the values are the unique identifiers.

=item delete ( MSGNUM )

Mark message C<MSGNUM> to be deleted from the remote mailbox. All messages

that are marked to be deleted will be removed from the remote mailbox

when the server connection closed.

=item reset ()

Reset the status of the remote POP3 server. This includes reseting the

status of all messages to not be deleted.

=item quit ()

Quit and close the connection to the remote POP3 server. Any messages marked

as deleted will be deleted from the remote mailbox.

=back

=head1 NOTES

If a C<Net::POP3> object goes out of scope before C<quit> method is called