# Mail::Internet.pm
#
# Copyright (c) 1995-8 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 Mail::Internet;
use strict;

require 5.002;

use Carp;
use AutoLoader;
use Mail::Header;
use vars qw($VERSION);

BEGIN {
    $VERSION = "1.33";
    *AUTOLOAD = \&AutoLoader::AUTOLOAD;

    unless(defined &UNIVERSAL::isa) {
	*UNIVERSAL::isa = sub {
	    my($obj,$type) = @_;
	    my $pkg = ref($obj) || $obj;
	    my @pkg = ($pkg);
	    my %done;
	    while(@pkg) {
        	$pkg = shift @pkg;
		return 1 if $pkg eq $type;
        	next if exists $done{$pkg};
        	$done{$pkg} = 1;

		no strict 'refs';

        	unshift @pkg,@{$pkg . "::ISA"}
        	    if(@{$pkg . "::ISA"});
	    }
	    undef;
	}
    }
}


sub new
{
 my $self = shift;
 my $type = ref($self) || $self;
 my $arg = @_ % 2 ? shift : undef;
 my %arg = @_;

 my $me = bless {}, $type;

 $me->{'mail_inet_head'} = $arg{Header} if exists $arg{Header};
 $me->{'mail_inet_body'} = $arg{Body} if exists $arg{Body};

 $me->head->fold_length(delete $arg{FoldLength} || 79); # Default fold length
 $me->head->mail_from($arg{MailFrom}) if exists $arg{MailFrom};
 $me->head->modify(exists $arg{Modify} ? $arg{Modify} : 1);

 if(defined $arg)
  {
   if(ref($arg) eq 'ARRAY')
    {
     $me->header($arg) unless exists $arg{Header};
     $me->body($arg) unless exists $arg{Body};
    }
   elsif(defined fileno($arg))
    {
     $me->read_header($arg) unless exists $arg{Header};
     $me->read_body($arg) unless exists $arg{Body};
    }
  }

 return $me;
}

sub read
{
 my $me = shift;

 $me->read_header(@_);
 $me->read_body(@_);
}

sub read_body
{
 my($me,$fd) = @_;

 $me->body( [ <$fd> ] );
}


sub extract
{
 my $me = shift;
 my $arg = shift;

 $me->head->extract($arg);
 $me->body($arg);
}


sub body
{
 my $me = shift;
 my $body = $me->{'mail_inet_body'} ||= [];

 if(@_)
  {
   my $new = shift;
   $me->{'mail_inet_body'} = ref($new) eq 'ARRAY' ? $new : [ $new ];
  }

 return $body;
}

sub header { shift->head->header(@_) }
sub fold { shift->head->fold(@_) }
sub fold_length { shift->head->fold_length(@_) }
sub combine { shift->head->combine(@_) }
sub print_header { shift->{'mail_inet_head'}->print(@_) }
sub head { shift->{'mail_inet_head'} ||= new Mail::Header }

sub read_header
{
 my $me = shift;
 my $head = $me->head;
 $head->read(@_);
 $head->header();
}

sub clean_header
{
 carp "clean_header depreciated, use ->header" if $^W;
 shift->header();
}

sub tidy_headers
{
 carp "tidy_headers no longer required" if $^W;
}


sub add
{
 my $me = shift;
 my $head = $me->head;
 my $ret;
 while(@_)
  {
   my ($tag,$line) = splice(@_,0,2);

   $ret = $head->add($tag,$line,-1) or
	return undef;
  }

 $ret;
}

sub replace
{
 my $me = shift;
 my $head = $me->head;
 my $ret;

 while(@_)
  {
   my ($tag,$line) = splice(@_,0,2);

   $ret = $head->replace($tag,$line,0) or
	return undef;
  }

 $ret;
}

sub get
{
 my $me = shift;
 my $head = $me->head;
 my @ret = ();
 my $tag;

 foreach $tag (@_)
  {
   last
	if push(@ret, $head->get($tag)) && !wantarray;
  }

 wantarray ? @ret : shift @ret;
}

sub delete
{
 my $me = shift;
 my $head = $me->head;
 my @ret = ();
 my $tag;

 foreach $tag (@_)
  {
   push(@ret, $head->delete($tag));
  }

 @ret;
}

sub dup
{
 my $me = shift;
 my $type = ref($me);
 my $dup = $type->new;

 $dup->{'mail_inet_body'} = [@{$me->body}]
	if exists $me->{'mail_inet_body'};

 $dup->{'mail_inet_head'} = $me->{'mail_inet_head'}->dup
	if exists $me->{'mail_inet_head'};

 $dup;
}

sub empty
{
 my $me = shift;

 %{*$me} = ();

 1;
}

sub print_body
{
 my $me = shift;
 my $fd = shift || \*STDOUT;
 my $ln;

 foreach $ln (@{$me->body})
  {
   print $fd $ln or
	return 0;
  }

 1;
}

sub print
{
 my $me = shift;
 my $fd = shift || \*STDOUT;

 $me->print_header($fd)
    and print $fd "\n"
    and $me->print_body($fd);
}

sub as_string
{
 my $me = shift;

 $me->head->as_string . "\n" . join '', @{ $me->body };
}

sub as_mbox_string
{
 my $me = shift->dup;
 my $escaped = shift;

 $me->head->delete('Content-Length');
 $me->escape_from unless $escaped;
 $me->as_string . "\n";
}

sub remove_sig
{
 my $me = shift;
 my $nlines = shift || 10;

 my $body = $me->body;
 my($line,$i);

 $line = scalar(@{$body});
 return unless($line);

 while($i++ < $nlines && $line--)
  {
   if($body->[$line] =~ /\A--\040?[\r\n]+/)
    {
     splice(@{$body},$line,$i);
     last;
    }
  }
}

sub tidy_body
{
 my $me = shift;

 my $body = $me->body;
 my $line;

 if(scalar(@{$body}))
  {
   shift @$body
        while(scalar(@{$body}) && $body->[0] =~ /\A\s*\Z/);
   pop @$body
        while(scalar(@{$body}) && $body->[-1] =~ /\A\s*\Z/);
  }

 return $body;
}

sub DESTROY {}

# Auto loaded methods go after __END__
__END__

sub reply;


use Mail::Address;

 sub reply
{
 my $me = shift;
 my %arg = @_;
 my $pkg = ref $me;
 my @reply = ();

 local *MAILHDR;
 if(open(MAILHDR,"$ENV{HOME}/.mailhdr")) 
  {
   # User has defined a mail header template
   @reply = <MAILHDR>;
   close(MAILHDR);
  }

 my $reply = $pkg->new(\@reply);

 my($to,$cc,$name,$body,$id);

 # The Subject line

 my $subject = $me->get('Subject') || "";

 $subject = "Re: " . $subject if($subject =~ /\S+/ && $subject !~ /Re:/i);

 $reply->replace('Subject',$subject);

 # Locate who we are sending to
 $to = $me->get('Reply-To')
       || $me->get('From')
       || $me->get('Return-Path')
       || "";

 # Mail::Address->parse returns a list of refs to a 2 element array
 my $sender = (Mail::Address->parse($to))[0];

 $name = $sender->name;
 $id = $sender->address;

 unless(defined $name)
  {
   my $fr = $me->get('From');

   $fr = (Mail::Address->parse($fr))[0] if(defined $fr);
   $name = $fr->name if(defined $fr);
  }

 my $indent = $arg{Indent} || ">";

 if($indent =~ /%/) 
  {
   my %hash = ( '%' => '%');
   my @name = grep(do { length > 0 }, split(/[\n\s]+/,$name || ""));
   my @tmp;

   @name = "" unless(@name);

   $hash{f} = $name[0];
   $hash{F} = $#name ? substr($hash{f},0,1) : $hash{f};

   $hash{l} = $#name ? $name[$#name] : "";
   $hash{L} = substr($hash{l},0,1) || "";

   $hash{n} = $name || "";
   $hash{I} = join("",grep($_ = substr($_,0,1), @tmp = @name));

   $indent =~ s/%(.)/defined $hash{$1} ? $hash{$1} : $1/eg;
  }

 $reply->replace('To', $id);

 # Find addresses not to include
 my %nocc = ();
 my $mailaddresses = $ENV{MAILADDRESSES} || "";
 my $addr;

 $nocc{lc $id} = 1;

 foreach $addr (Mail::Address->parse($reply->get('Bcc'),$mailaddresses)) 
  {
   my $lc = lc $addr->address;
   $nocc{$lc} = 1;
  }

 if($arg{ReplyAll} || 0)
  {
   # Who shall we copy this to
   my %cc = ();

   foreach $addr (Mail::Address->parse($me->get('To'),$me->get('Cc'))) 
    {
     my $lc = lc $addr->address;
     $cc{$lc} = $addr->format unless(defined $nocc{$lc});
    }
   $cc = join(', ',values %cc);

   $reply->replace('Cc', $cc);
  }

 # References
 my $refs = $me->get('References') || "";
 my $mid = $me->get('Message-Id');

 $refs .= " " . $mid if(defined $mid);
 $reply->replace('References',$refs);

 # In-Reply-To
 my $date = $me->get('Date');
 my $inreply = "";

 if(defined $mid)
  {
   $inreply  = $mid;
   $inreply .= " from " . $name if(defined $name);
   $inreply .= " on " . $date if(defined $date);
  }
 elsif(defined $name)
  {
   $inreply = $name . "'s message";
   $inreply .= "of " . $date if(defined $date);
  }

 $reply->replace('In-Reply-To', $inreply);

 # Quote the body
 $body  = $reply->body;

 @$body = @{$me->body};		# copy body
 $reply->remove_sig;		# remove signature, if any
 $reply->tidy_body;		# tidy up
 map { s/\A/$indent/ } @$body;	# indent

 # Add references
 unshift @{$body}, (defined $name ? $name . " " : "") . "<$id> writes:\n";

 if(defined $arg{Keep} && 'ARRAY' eq ref($arg{Keep})) 
  {
   # Copy lines from the original
   my $keep;

   foreach $keep (@{$arg{Keep}}) 
    {
     my $ln = $me->get($keep);
     $reply->replace($keep,$ln) if(defined $ln);
    }
  }

 if(defined $arg{Exclude} && 'ARRAY' eq ref($arg{Exclude}))
  {
   # Exclude lines
   $reply->delete(@{$arg{Exclude}});
  }

 # remove empty header lins
 $reply->head->cleanup;

 $reply;
}

sub add_signature
{
 my $me = shift;
 carp "add_signature depriciated, use ->sign" if $^W;
 $me->sign(File => shift || "$ENV{HOME}/.signature");
}

sub sign
{
 my $me = shift;
 my %arg = @_;
 my $sig;
 my @sig;

 if($sig = delete $arg{File})
  {
   local *SIG;

   if(open(SIG,$sig))
    {
     local $_;
     while(<SIG>) { last unless /\A(--)?\s*\Z/; }

     @sig = ($_,<SIG>,"\n");

     close(SIG);
    }
  }
 elsif($sig = delete $arg{Signature})
  {
   @sig = ref($sig) ? @$sig : split(/\n/, $sig);
  }

 if(@sig)
  {
   $me->remove_sig;
   map(s/\n?\Z/\n/,@sig);
   push(@{$me->body}, "-- \n",@sig);
  }
}

sub _prephdr {

    use Mail::Util;

    my $hdr = shift;

    $hdr->delete('From '); # Just in case :-)

    # An original message should not have any Received lines

    $hdr->delete('Received');

    $hdr->replace('X-Mailer', "Perl5 Mail::Internet v" . $Mail::Internet::VERSION);

    my $name = eval { local $SIG{__DIE__}; (getpwuid($>))[6] } || $ENV{NAME} || "";

    while($name =~ s/\([^\(\)]*\)//) { 1; }

    if($name =~ /[^\w\s]/) {
	$name =~ s/"/\"/g;
	$name = '"' . $name . '"';
    }

    my $from = sprintf "%s <%s>", $name, Mail::Util::mailaddress();
    $from =~ s/\s{2,}/ /g;

    my $tag;

    foreach $tag (qw(From Sender)) {
	$hdr->add($tag,$from)
	    unless($hdr->get($tag));
    }
}

sub smtpsend;

use Carp;
use Mail::Util qw(mailaddress);
use Mail::Address;
use Net::Domain qw(hostname);
use Net::SMTP;
use strict;

 sub smtpsend 
{
    my $src  = shift;
    my %opt = @_;
    my $host = $opt{Host};
    my $noquit = 0;
    my $smtp;
    my @hello = defined $opt{Hello} ? (Hello => $opt{Hello}) : ();

    push(@hello, 'Port', $opt{'Port'})
	if exists $opt{'Port'};

    push(@hello, 'Debug', $opt{'Debug'})
	if exists $opt{'Debug'};

    unless(defined($host)) {
	local $SIG{__DIE__};
	my @hosts = qw(mailhost localhost);
	unshift(@hosts, split(/:/, $ENV{SMTPHOSTS})) if(defined $ENV{SMTPHOSTS});

	foreach $host (@hosts) {
	    $smtp = eval { Net::SMTP->new($host, @hello) };
	    last if(defined $smtp);
	}
    }
    elsif(ref($host) && UNIVERSAL::isa($host,'Net::SMTP')) {
	$smtp = $host;
	$noquit = 1;
    }
    else {
	local $SIG{__DIE__};
	$smtp = eval { Net::SMTP->new($host, @hello) };
    }

    return ()
	unless(defined $smtp);

    my $hdr = $src->head->dup;

    _prephdr($hdr);

    # Who is it to

    my @rcpt = map { ref($_) ? @$_ : $_ } grep { defined } @opt{'To','Cc','Bcc'};
    @rcpt = map { $hdr->get($_) } qw(To Cc Bcc)
	unless @rcpt;
    my @addr = map($_->address, Mail::Address->parse(@rcpt));

    return ()
	unless(@addr);

    $hdr->delete('Bcc'); # Remove blind Cc's

    # Send it

    my $ok = $smtp->mail( mailaddress() ) &&
		$smtp->to(@addr) &&
		$smtp->data(join("", @{$hdr->header},"\n",@{$src->body}));

    $smtp->quit
	unless $noquit;

    $ok ? @addr : ();
}

sub send;

use Mail::Mailer;
use strict;

 sub send 
{
    my ($src, $type, @args) = @_;

    my $hdr = $src->head->dup;

    _prephdr($hdr);

    my $headers = $hdr->header_hashref;

    # Actually send it
    my $mailer = Mail::Mailer->new($type, @args);
    $mailer->open($headers);
    $src->print_body($mailer);
    $mailer->close();
}

sub nntppost;

use Mail::Util qw(mailaddress);
use Net::NNTP;
use strict;

 sub nntppost
{
    my $mail = shift;
    my %opt = @_;

    my $groups = $mail->get('Newsgroups') || "";
    my @groups = split(/[\s,]+/,$groups);

    return ()
	unless @groups;

    my $hdr = $mail->head->dup;

    _prephdr($hdr);

    # Remove these incase the NNTP host decides to mail as well as me
    $hdr->delete(qw(To Cc Bcc)); 

    my $news;
    my $noquit = 0;
    my $host = $opt{Host};

    if(ref($host) && UNIVERSAL::isa($host,'Net::NNTP')) {
	$news = $host;
	$noquit = 1;
    }
    else {
	my @opt = ();

	push(@opt, $opt{'Host'});

	push(@opt, 'Port', $opt{'Port'})
	    if exists $opt{'Port'};

	push(@opt, 'Debug', $opt{'Debug'})
	    if exists $opt{'Debug'};

	$news = new Net::NNTP(@opt)
	    or return ();
    }

    $news->post(@{$hdr->header},"\n",@{$mail->body});

    my $code = $news->code;

    $news->quit
	unless $noquit;

    return 240 == $code ? @groups : ();
}

sub escape_from
{
 my $me = shift;

 my $body = $me->body;
 local $_;

 scalar grep { s/\A(>*From) />$1 /o } @$body;
}

sub unescape_from
{
 my $me = shift;

 my $body = $me->body;
 local $_;

 scalar grep { s/\A>(>*From) /$1 /o } @$body;
}

1; # keep require happy



=head1 NAME

Mail::Internet - manipulate Internet format (RFC 822) mail messages

=head1 SYNOPSIS

    use Mail::Internet;

=head1 DESCRIPTION

This package provides a class object which can be used for reading, creating,
manipulating and writing a message with RFC822 compliant headers.

=head1 CONSTRUCTOR

=over 4

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

C<ARG> is optiona and may be either a file descriptor (reference to a GLOB)
or a reference to an array. If given the new object will be
initialized with headers and body either from the array of read from 
the file descriptor.

C<OPTIONS> is a list of options given in the form of key-value
pairs, just like a hash table. Valid options are

=over 8

=item B<Header>

The value of this option should be a C<Mail::Header> object. If given then
C<Mail::Internet> will not attempt to read a mail header from C<ARG>, if
it was specified.

=item B<Body>

The value of this option should be a reference to an array which contains
the lines for the body of the message. Each line should be terminated with
C<\n> (LF). If Body is given then C<Mail::Internet> will not attempt to
read the body from C<ARG> (even if it is specified).

=back

The Mail::Header options C<Modify>, C<MailFrom> and C<FoldLength> may
also be given.

=back

=head1 METHODS

=over 4

=item body ()

Returns the body of the message. This is a reference to an array.
Each entry in the array represents a single line in the message.

=item print_header ( [ FILEHANDLE ] )

=item print_body ( [ FILEHANDLE ] )

=item print ( [ FILEHANDLE ] )

Print the header, body or whole message to file descriptor I<FILEHANDLE>.
I<$fd> should be a reference to a GLOB. If I<FILEHANDLE> is not given the
output will be sent to STDOUT.

    $mail->print( \*STDOUT );  # Print message to STDOUT

=item as_string ()

Returns the message as a single string.

=item as_mbox_string ( [ ALREADY_ESCAPED ] )

Returns the message as a string in mbox format.  C<ALREADY_ESCAPED>, if
given and true, indicates that ->escape_from has already been called on
this object.

=item head ()

Returns the C<Mail::Header> object which holds the headers for the current
message

=back

=head1 UTILITY METHODS

The following methods are more a utility type than a manipulation
type of method.

=over 4

=item remove_sig ( [ NLINES ] )

Attempts to remove a users signature from the body of a message. It does this 
by looking for a line equal to C<'-- '> within the last C<NLINES> of the
message. If found then that line and all lines after it will be removed. If
C<NLINES> is not given a default value of 10 will be used. This would be of
most use in auto-reply scripts.

=item tidy_body ()

Removes all leading and trailing lines from the body that only contain
white spaces.

=item reply ()

Create a new object with header initialised for a reply to the current 
object. And the body will be a copy of the current message indented.

=item add_signature ( [ FILE ] )

Append a signature to the message. C<FILE> is a file which contains
the signature, if not given then the file "$ENV{HOME}/.signature"
will be checked for.

=item send ( [ type [ args.. ]] )

Send a Mail::Internet message using Mail::Mailer.  Type and args are
passed on to C<Mail::Mailer>

=item smtpsend ( [ OPTIONS ] )

Send a Mail::Internet message via SMTP, requires Net::SMTP

The return value will be a list of email addresses that the message was sent
to. If the message was not sent the list will be empty.

Options are passed as key-value pairs. Current options are

=over 4

=item Host

Name of the SMTP server to connect to, or a Net::SMTP object to use

If C<Host> is not given then the SMTP host is found by attempting
connections first to hosts specified in C<$ENV{SMTPHOSTS}>, a colon
separated list, then C<mailhost> and C<localhost>.

=item To

=item Cc

=item Bcc

Send the email to the given addresses, each can be either a string or
a reference to a list of email addresses. If none of C<To>, <Cc> or C<Bcc>
are given then the addresses are extracted from the message being sent.

=item Hello

Send a HELO (or EHLO) command to the server with the given name.

=item Port

Port number to connect to on remote host

=item Debug

Debug value to pass to Net::SMPT, see <Net::SMTP>

=back

=item nntppost ( [ OPTIONS ] )

Post an article via NNTP, requires Net::NNTP.

Options are passed as key-value pairs. Current options are

=over 4

=item Host

Name of NNTP server to connect to, or a Net::NNTP object to use.

=item Port

Port number to connect to on remote host

=item Debug

Debug value to pass to Net::NNTP, see <Net::NNTP>

=back

=item escape_from ()

It can cause problems with some applications if a message contains a line
starting with C<`From '>, in particular when attempting to split a folder.
This method inserts a leading C<`>'> on anyline that matches the regular
expression C</^>*From/>

=item unescape_from ()

This method will remove the escaping added by escape_from

=back

=head1 SEE ALSO

L<Mail::Header>
L<Mail::Address>

=head1 AUTHOR

Graham Barr <gbarr@pobox.com>

=head1 COPYRIGHT

Copyright (c) 1995-7 Graham Barr. All rights reserved. This program is free
software; you can redistribute it and/or modify it under the same terms
as Perl itself.

=cut