libemail-mime-perl 1.925-1 / usr / share / perl5 / Email / MIME.pm

use 5.008001;
use strict;
use warnings;

package Email::MIME;
{
  $Email::MIME::VERSION = '1.925';
}
use Email::Simple 2.102; # crlf handling
use parent qw(Email::Simple);
# ABSTRACT: easy MIME message handling

use Carp ();
use Email::MessageID;
use Email::MIME::Creator;
use Email::MIME::ContentType 1.016; # type/subtype, not discrete/composite
use Email::MIME::Encode;
use Email::MIME::Encodings 1.314;
use Email::MIME::Header;
use Email::MIME::Modifier;
use Encode 1.9801 ();
use Scalar::Util qw(reftype);


our $CREATOR = 'Email::MIME::Creator';

my $NO_ENCODE_RE = qr/
  \A
  (?:7bit|8bit|binary)\s*(?:;|$)
/ix;

sub new {
  my $self = shift->SUPER::new(@_);
  $self->{ct} = parse_content_type($self->content_type);
  $self->parts;
  return $self;
}


sub create {
  my ($class, %args) = @_;

  my $header = '';
  my %headers;
  if (exists $args{header}) {
    my @headers = @{ $args{header} };
    pop @headers if @headers % 2 == 1;
    while (my ($key, $value) = splice @headers, 0, 2) {
      $headers{$key} = 1;
      $CREATOR->_add_to_header(\$header, $key, $value);
    }
  }

  if (exists $args{header_str}) {
    my @headers = @{ $args{header_str} };
    pop @headers if @headers % 2 == 1;
    while (my ($key, $value) = splice @headers, 0, 2) {
      $headers{$key} = 1;

      $value = Email::MIME::Encode::maybe_mime_encode_header(
          $key, $value, 'UTF-8'
      );
      $CREATOR->_add_to_header(\$header, $key, $value);
    }
  }

  $CREATOR->_add_to_header(\$header, Date => $CREATOR->_date_header)
    unless exists $headers{Date};
  $CREATOR->_add_to_header(\$header, 'MIME-Version' => '1.0',);

  my %attrs = $args{attributes} ? %{ $args{attributes} } : ();

  # XXX: This is awful... but if we don't do this, then Email::MIME->new will
  # end up calling parse_content_type($self->content_type) which will mean
  # parse_content_type(undef) which, for some reason, returns the default.
  # It's really sort of mind-boggling.  Anyway, the default ends up being
  # q{text/plain; charset="us-ascii"} so that if content_type is in the
  # attributes, but not charset, then charset isn't changedand you up with
  # something that's q{image/jpeg; charset="us-ascii"} and you look like a
  # moron. -- rjbs, 2009-01-20
  if (
    grep { exists $attrs{$_} } qw(content_type charset name format boundary)
  ) {
    $CREATOR->_add_to_header(\$header, 'Content-Type' => 'text/plain',);
  }

  my $email = $class->new($header);

  foreach (qw(
    content_type charset name format boundary
    encoding
    disposition filename
  )) {
    my $set = "$_\_set";
    $email->$set($attrs{$_}) if exists $attrs{$_};
  }

  my $body_args = grep { defined $args{$_} } qw(parts body body_str);
  Carp::confess("only one of parts, body, or body_str may be given")
    if $body_args > 1;

  if ($args{parts} && @{ $args{parts} }) {
    foreach my $part (@{ $args{parts} }) {
      $part = $CREATOR->_construct_part($part)
        unless ref($part);
    }
    $email->parts_set($args{parts});
  } elsif (defined $args{body}) {
    $email->body_set($args{body});
  } elsif (defined $args{body_str}) {
    Carp::confess("body_str was given, but no charset is defined")
      unless my $charset = $attrs{charset};

    Carp::confess("body_str was given, but no encoding is defined")
      unless $attrs{encoding};

    my $body_octets = Encode::encode($attrs{charset}, $args{body_str}, 1);
    $email->body_set($body_octets);
  }

  $email;
}

sub as_string {
  my $self = shift;
  return $self->__head->as_string
    . ($self->{mycrlf} || "\n")  # XXX: replace with ->crlf
    . $self->body_raw;
}

sub parts {
  my $self = shift;

  $self->fill_parts unless $self->{parts};

  my @parts = @{ $self->{parts} };
  @parts = $self unless @parts;
  return @parts;
}

sub subparts {
  my ($self) = @_;

  $self->fill_parts unless $self->{parts};
  my @parts = @{ $self->{parts} };
  return @parts;
}

sub fill_parts {
  my $self = shift;

  if (
    $self->{ct}{type} eq "multipart"
    or $self->{ct}{type} eq "message"
  ) {
    $self->parts_multipart;
  } else {
    $self->parts_single_part;
  }

  return $self;
}

sub body {
  my $self = shift;
  my $body = $self->SUPER::body;
  my $cte  = $self->header("Content-Transfer-Encoding") || '';

  $cte =~ s/\A\s+//;
  $cte =~ s/\s+\z//;
  $cte =~ s/;.+//; # For S/MIME, etc.

  return $body unless $cte;

  if (!$self->force_decode_hook and $cte =~ $NO_ENCODE_RE) {
    return $body;
  }

  $body = $self->decode_hook($body) if $self->can("decode_hook");

  $body = Email::MIME::Encodings::decode($cte, $body, '7bit');
  return $body;
}

sub parts_single_part {
  my $self = shift;
  $self->{parts} = [];
  return $self;
}

sub body_raw {
  return $_[0]->{body_raw} || $_[0]->SUPER::body;
}

sub body_str {
  my ($self) = @_;
  my $encoding = $self->{ct}{attributes}{charset};

  unless ($encoding) {
    if ($self->{ct}{type} eq 'text'
      and
      ($self->{ct}{subtype} eq 'plain' or $self->{ct}{subtype} eq 'html')
    ) {

      # assume that plaintext or html without ANY charset is us-ascii
      return $self->body;
    }

    Carp::confess("can't get body as a string for " . $self->content_type);
  }

  my $str = Encode::decode($encoding, $self->body, 1);
  return $str;
}

sub parts_multipart {
  my $self     = shift;
  my $boundary = $self->{ct}->{attributes}->{boundary};

  # Take a message, join all its lines together.  Now try to Email::MIME->new
  # it with 1.861 or earlier.  Death!  It tries to recurse endlessly on the
  # body, because every time it splits on boundary it gets itself. Obviously
  # that means it's a bogus message, but a mangled result (or exception) is
  # better than endless recursion. -- rjbs, 2008-01-07
  return $self->parts_single_part
    unless $boundary and $self->body_raw =~ /^--\Q$boundary\E\s*$/sm;

  $self->{body_raw} = $self->SUPER::body;

  # rfc1521 7.2.1
  my ($body, $epilogue) = split /^--\Q$boundary\E--\s*$/sm, $self->body_raw, 2;

  my @bits = split /^--\Q$boundary\E\s*$/sm, ($body || '');

  $self->SUPER::body_set(undef);

  # If there are no headers in the potential MIME part, it's just part of the
  # body.  This is a horrible hack, although it's debateable whether it was
  # better or worse when it was $self->{body} = shift @bits ... -- rjbs,
  # 2006-11-27
  $self->SUPER::body_set(shift @bits) if ($bits[0] || '') !~ /.*:.*/;

  my $bits = @bits;

  my @parts;
  for my $bit (@bits) {
    $bit =~ s/\A[\n\r]+//smg;
    $bit =~ s/$self->{mycrlf}\Z//smg;
    my $email = (ref $self)->new($bit);
    push @parts, $email;
  }

  $self->{parts} = \@parts;

  return @{ $self->{parts} };
}

sub force_decode_hook { 0 }
sub decode_hook       { return $_[1] }
sub content_type      { scalar shift->header("Content-type"); }

sub debug_structure {
  my ($self, $level) = @_;
  $level ||= 0;
  my $rv = " " x (5 * $level);
  $rv .= "+ " . ($self->content_type || '') . "\n";
  my @parts = $self->parts;
  if (@parts > 1) { $rv .= $_->debug_structure($level + 1) for @parts; }
  return $rv;
}

my %gcache;

sub filename {
  my ($self, $force) = @_;
  return $gcache{$self} if exists $gcache{$self};

  my $dis = $self->header("Content-Disposition") || '';
  my $attrs
    = $dis =~ s/^.*?;//
    ? Email::MIME::ContentType::_parse_attributes($dis)
    : {};
  my $name = $attrs->{filename}
    || $self->{ct}{attributes}{name};
  return $name if $name or !$force;
  return $gcache{$self} = $self->invent_filename(
    $self->{ct}->{type} . "/" . $self->{ct}->{subtype});
}

my $gname = 0;

sub invent_filename {
  my ($self, $ct) = @_;
  require MIME::Types;
  my $type = MIME::Types->new->type($ct);
  my $ext = $type && (($type->extensions)[0]);
  $ext ||= "dat";
  return "attachment-$$-" . $gname++ . ".$ext";
}

sub default_header_class { 'Email::MIME::Header' }

sub header_str_set {
  my $self = shift;
  $self->header_obj->header_str_set(@_);
}


sub content_type_set {
  my ($self, $ct) = @_;
  my $ct_header = parse_content_type($self->header('Content-Type'));
  @{$ct_header}{qw[type subtype]} = split m[/], $ct;
  $self->_compose_content_type($ct_header);
  $self->_reset_cids;
  return $ct;
}


BEGIN {
  foreach my $attr (qw[charset name format]) {
    my $code = sub {
      my ($self, $value) = @_;
      my $ct_header = parse_content_type($self->header('Content-Type'));
      if ($value) {
        $ct_header->{attributes}->{$attr} = $value;
      } else {
        delete $ct_header->{attributes}->{$attr};
      }
      $self->_compose_content_type($ct_header);
      return $value;
    };

    no strict 'refs';  ## no critic strict
    *{"$attr\_set"} = $code;
  }
}

sub boundary_set {
  my ($self, $value) = @_;
  my $ct_header = parse_content_type($self->header('Content-Type'));

  if ($value) {
    $ct_header->{attributes}->{boundary} = $value;
  } else {
    delete $ct_header->{attributes}->{boundary};
  }
  $self->_compose_content_type($ct_header);

  $self->parts_set([ $self->parts ]) if $self->parts > 1;
}


sub encoding_set {
  my ($self, $enc) = @_;
  $enc ||= '7bit';
  my $body = $self->body;
  $self->header_set('Content-Transfer-Encoding' => $enc);
  $self->body_set($body);
}


sub body_set {
  my ($self, $body) = @_;
  my $body_ref;

  if (ref $body) {
    Carp::croak("provided body reference is not a scalar reference")
      unless reftype($body) eq 'SCALAR';
    $body_ref = $body;
    $body     = $$body_ref;
  } else {
    $body_ref = \$body;
  }
  my $enc = $self->header('Content-Transfer-Encoding');

  # XXX: This is a disgusting hack and needs to be fixed, probably by a
  # clearer definition and reengineering of Simple construction.  The bug
  # this fixes is an indirect result of the previous behavior in which all
  # Simple subclasses were free to alter the guts of the Email::Simple
  # object. -- rjbs, 2007-07-16
  unless (((caller(1))[3] || '') eq 'Email::Simple::new') {
    $body = Email::MIME::Encodings::encode($enc, $body)
      unless !$enc || $enc =~ $NO_ENCODE_RE;
  }

  $self->{body_raw} = $body;
  $self->SUPER::body_set($body_ref);
}


sub body_str_set {
  my ($self, $body_str) = @_;

  my $ct = parse_content_type($self->content_type);
  Carp::confess("body_str was given, but no charset is defined")
    unless my $charset = $ct->{attributes}{charset};

  my $body_octets = Encode::encode($charset, $body_str, 1);
  $self->body_set($body_octets);
}


sub disposition_set {
  my ($self, $dis) = @_;
  $dis ||= 'inline';
  my $dis_header = $self->header('Content-Disposition');
  $dis_header
    ? ($dis_header =~ s/^([^;]+)/$dis/)
    : ($dis_header = $dis);
  $self->header_set('Content-Disposition' => $dis_header);
}


sub filename_set {
  my ($self, $filename) = @_;
  my $dis_header = $self->header('Content-Disposition');
  my ($disposition, $attrs);
  if ($dis_header) {
    ($disposition) = ($dis_header =~ /^([^;]+)/);
    $dis_header =~ s/^$disposition(?:;\s*)?//;
    $attrs = Email::MIME::ContentType::_parse_attributes($dis_header) || {};
  }
  $filename ? $attrs->{filename} = $filename : delete $attrs->{filename};
  $disposition ||= 'inline';

  my $dis = $disposition;
  while (my ($attr, $val) = each %{$attrs}) {
    $dis .= qq[; $attr="$val"];
  }

  $self->header_set('Content-Disposition' => $dis);
}


sub parts_set {
  my ($self, $parts) = @_;
  my $body = q{};

  my $ct_header = parse_content_type($self->header('Content-Type'));

  if (@{$parts} > 1 or $ct_header->{type} eq 'multipart') {

    # setup multipart
    $ct_header->{attributes}->{boundary} ||= Email::MessageID->new->user;
    my $bound = $ct_header->{attributes}->{boundary};
    foreach my $part (@{$parts}) {
      $body .= "$self->{mycrlf}--$bound$self->{mycrlf}";
      $body .= $part->as_string;
    }
    $body .= "$self->{mycrlf}--$bound--$self->{mycrlf}";
    @{$ct_header}{qw[type subtype]} = qw[multipart mixed]
      unless grep { $ct_header->{type} eq $_ } qw[multipart message];
  } elsif (@$parts == 1) {  # setup singlepart
    $body .= $parts->[0]->body;
    @{$ct_header}{qw[type subtype]}
      = @{ parse_content_type($parts->[0]->header('Content-Type')) }
      {qw[type subtype]};
    $self->encoding_set($parts->[0]->header('Content-Transfer-Encoding'));
    delete $ct_header->{attributes}->{boundary};
  }

  $self->_compose_content_type($ct_header);
  $self->body_set($body);
  $self->fill_parts;
  $self->_reset_cids;
}


sub parts_add {
  my ($self, $parts) = @_;
  $self->parts_set([ $self->parts, @{$parts}, ]);
}


sub walk_parts {
  my ($self, $callback) = @_;

  my %changed;

  my $walk;
  $walk = sub {
    my ($part) = @_;
    $callback->($part);

    if (my @orig_subparts = $part->subparts) {
      my @subparts = map {; $walk->($_) } @orig_subparts;
      my $differ
        =  (@subparts != @orig_subparts)
        || (grep { $subparts[$_] != $orig_subparts[$_] } (0 .. $#subparts))
        || (grep { $changed{ 0+$subparts[$_] } } (0 .. $#subparts));

      if ($differ) {
        $part->parts_set(\@subparts);
        $changed{ 0+$part }++;
      }
    }

    return $part;
  };

  my $rv = $walk->($self);

  undef $walk;

  return $rv;
}

sub _compose_content_type {
  my ($self, $ct_header) = @_;
  my $ct = join q{/}, @{$ct_header}{qw[type subtype]};
  for my $attr (sort keys %{ $ct_header->{attributes} }) {
    $ct .= qq[; $attr="$ct_header->{attributes}{$attr}"];
  }
  $self->header_set('Content-Type' => $ct);
  $self->{ct} = $ct_header;
}

sub _get_cid {
  Email::MessageID->new->address;
}

sub _reset_cids {
  my ($self) = @_;

  my $ct_header = parse_content_type($self->header('Content-Type'));

  if ($self->parts > 1) {
    if ($ct_header->{subtype} eq 'alternative') {
      my %cids;
      for my $part ($self->parts) {
        my $cid
          = defined $part->header('Content-ID')
          ? $part->header('Content-ID')
          : q{};
        $cids{$cid}++;
      }
      return if keys(%cids) == 1;

      my $cid = $self->_get_cid;
      $_->header_set('Content-ID' => "<$cid>") for $self->parts;
    } else {
      foreach ($self->parts) {
        my $cid = $self->_get_cid;
        $_->header_set('Content-ID' => "<$cid>")
          unless $_->header('Content-ID');
      }
    }
  }
}

1;

__END__

=pod

=head1 NAME

Email::MIME - easy MIME message handling

=head1 VERSION

version 1.925

=head1 SYNOPSIS

B<Wait!>  Before you read this, maybe you just need L<Email::Stuffer>, which is
a much easier-to-use tool for building simple email messages that might have
attachments or both plain text and HTML.  If that doesn't do it for you, then
by all means keep reading.

  use Email::MIME;
  my $parsed = Email::MIME->new($message);

  my @parts = $parsed->parts; # These will be Email::MIME objects, too.
  my $decoded = $parsed->body;
  my $non_decoded = $parsed->body_raw;

  my $content_type = $parsed->content_type;

...or...

  use Email::MIME::Creator;
  use IO::All;

  # multipart message
  my @parts = (
      Email::MIME->create(
          attributes => {
              filename     => "report.pdf",
              content_type => "application/pdf",
              encoding     => "quoted-printable",
              name         => "2004-financials.pdf",
          },
          body => io( "2004-financials.pdf" )->all,
      ),
      Email::MIME->create(
          attributes => {
              content_type => "text/plain",
              disposition  => "attachment",
              charset      => "US-ASCII",
          },
          body_str => "Hello there!",
      ),
  );

  my $email = Email::MIME->create(
      header_str => [ From => 'casey@geeknest.com' ],
      parts      => [ @parts ],
  );

  # nesting parts
  $email->parts_set(
      [
        $email->parts,
        Email::MIME->create( parts => [ @parts ] ),
      ],
  );
  
  # standard modifications
  $email->header_str_set( 'X-PoweredBy' => 'RT v3.0'      );
  $email->header_str_set( To            => rcpts()        );
  $email->header_str_set( Cc            => aux_rcpts()    );
  $email->header_str_set( Bcc           => sekrit_rcpts() );

  # more advanced
  $_->encoding_set( 'base64' ) for $email->parts;
  
  # Quick multipart creation
  my $quicky = Email::MIME->create(
      header_str => [
          From => 'my@address',
          To   => 'your@address',
      ],
      parts => [
          q[This is part one],
          q[This is part two],
          q[These could be binary too],
      ],
  );
  
  print $email->as_string;

=head1 DESCRIPTION

This is an extension of the L<Email::Simple> module, to handle MIME
encoded messages. It takes a message as a string, splits it up into its
constituent parts, and allows you access to various parts of the
message. Headers are decoded from MIME encoding.

=head1 METHODS

=head2 create

  my $single = Email::MIME->create(
    header_str => [ ... ],
    body_str   => '...',
    attributes => { ... },
  );

  my $multi = Email::MIME->create(
    header_str => [ ... ],
    parts      => [ ... ],
    attributes => { ... },
  );

This method creates a new MIME part. The C<header_str> parameter is a list of
headers pairs to include in the message. The value for each pair is expected to
be a text string that will be MIME-encoded as needed.  A similar C<header>
parameter can be provided in addition to or instead of C<header_str>.  Its
values will be used verbatim.

C<attributes> is a hash of MIME attributes to assign to the part, and may
override portions of the header set in the C<header> parameter.

The C<parts> parameter is a list reference containing C<Email::MIME>
objects. Elements of the C<parts> list can also be a non-reference
string of data. In that case, an C<Email::MIME> object will be created
for you. Simple checks will determine if the part is binary or not, and
all parts created in this fashion are encoded with C<base64>, just in case.

If C<body> is given instead of C<parts>, it specifies the body to be used for a
flat (subpart-less) MIME message.  It is assumed to be a sequence of octets.

If C<body_str> is given instead of C<body> or C<parts>, it is assumed to be a
character string to be used as the body.  If you provide a C<body_str>
parameter, you B<must> provide C<charset> and C<encoding> attributes.

Back to C<attributes>. The hash keys correspond directly to methods or
modifying a message from C<Email::MIME::Modifier>. The allowed keys are:
content_type, charset, name, format, boundary, encoding, disposition,
and filename. They will be mapped to C<"$attr\_set"> for message
modification.

=head2 content_type_set

  $email->content_type_set( 'text/html' );

Change the content type. All C<Content-Type> header attributes
will remain intact.

=head2 charset_set

=head2 name_set

=head2 format_set

=head2 boundary_set

  $email->charset_set( 'UTF-8' );
  $email->name_set( 'some_filename.txt' );
  $email->format_set( 'flowed' );
  $email->boundary_set( undef ); # remove the boundary

These four methods modify common C<Content-Type> attributes. If set to
C<undef>, the attribute is removed. All other C<Content-Type> header
information is preserved when modifying an attribute.

=head2 encoding_set

  $email->encoding_set( 'base64' );
  $email->encoding_set( 'quoted-printable' );
  $email->encoding_set( '8bit' );

Convert the message body and alter the C<Content-Transfer-Encoding>
header using this method. Your message body, the output of the C<body()>
method, will remain the same. The raw body, output with the C<body_raw()>
method, will be changed to reflect the new encoding.

=head2 body_set

  $email->body_set( $unencoded_body_string );

This method will encode the new body you send using the encoding
specified in the C<Content-Transfer-Encoding> header, then set
the body to the new encoded body.

This method overrides the default C<body_set()> method.

=head2 body_str_set

  $email->body_str_set($unicode_str);

This method behaves like C<body_set>, but assumes that the given value is a
Unicode string that should be encoded into the message's charset
before being set.

The charset must already be set, either manually (via the C<attributes>
argument to C<create> or C<charset_set>) or through the C<Content-Type> of a
parsed message.  If the charset can't be determined, an exception is thrown.

=head2 disposition_set

  $email->disposition_set( 'attachment' );

Alter the C<Content-Disposition> of a message. All header attributes
will remain intact.

=head2 filename_set

  $email->filename_set( 'boo.pdf' );

Sets the filename attribute in the C<Content-Disposition> header. All other
header information is preserved when setting this attribute.

=head2 parts_set

  $email->parts_set( \@new_parts );

Replaces the parts for an object. Accepts a reference to a list of
C<Email::MIME> objects, representing the new parts. If this message was
originally a single part, the C<Content-Type> header will be changed to
C<multipart/mixed>, and given a new boundary attribute.

=head2 parts_add

  $email->parts_add( \@more_parts );

Adds MIME parts onto the current MIME part. This is a simple extension
of C<parts_set> to make our lives easier. It accepts an array reference
of additional parts.

=head2 walk_parts

  $email->walk_parts(sub {
      my ($part) = @_;
      return if $part->subparts; # multipart
      
      if ( $part->content_type =~ m[text/html]i ) {
          my $body = $part->body;
          $body =~ s/<link [^>]+>//; # simple filter example
          $part->body_set( $body );
      }
  });

Walks through all the MIME parts in a message and applies a callback to
each. Accepts a code reference as its only argument. The code reference
will be passed a single argument, the current MIME part within the
top-level MIME object. All changes will be applied in place.

=head2 header_str_set

  $email->header_str_set($header_name => @value_strings);

This behaves like C<header_set>, but expects Unicode (character) strings as the
values to set, rather than pre-encoded byte strings.  It will encode them as
MIME encoded-words if they contain any control or 8-bit characters.

=head2 parts

This returns a list of C<Email::MIME> objects reflecting the parts of the
message. If it's a single-part message, you get the original object back.

In scalar context, this method returns the number of parts.

This is a stupid method.  Don't use it.

=head2 subparts

This returns a list of C<Email::MIME> objects reflecting the parts of the
message.  If it's a single-part message, this method returns an empty list.

In scalar context, this method returns the number of subparts.

=head2 body

This decodes and returns the body of the object I<as a byte string>. For
top-level objects in multi-part messages, this is highly likely to be something
like "This is a multi-part message in MIME format."

=head2 body_str

This decodes both the Content-Transfer-Encoding layer of the body (like the
C<body> method) as well as the charset encoding of the body (unlike the C<body>
method), returning a Unicode string.

If the charset is known, it is used.  If there is no charset but the content
type is either C<text/plain> or C<text/html>, us-ascii is assumed.  Otherwise,
an exception is thrown.

=head2 body_raw

This returns the body of the object, but doesn't decode the transfer encoding.

=head2 decode_hook

This method is called before the L<Email::MIME::Encodings> C<decode> method, to
decode the body of non-binary messages (or binary messages, if the
C<force_decode_hook> method returns true).  By default, this method does
nothing, but subclasses may define behavior.

This method could be used to implement the decryption of content in secure
email, for example.

=head2 content_type

This is a shortcut for access to the content type header.

=head2 filename

This provides the suggested filename for the attachment part. Normally
it will return the filename from the headers, but if C<filename> is
passed a true parameter, it will generate an appropriate "stable"
filename if one is not found in the MIME headers.

=head2 invent_filename

  my $filename = Email::MIME->invent_filename($content_type);

This routine is used by C<filename> to generate filenames for attached files.
It will attempt to choose a reasonable extension, falling back to F<dat>.

=head2 debug_structure

  my $description = $email->debug_structure;

This method returns a string that describes the structure of the MIME entity.
For example:

  + multipart/alternative; boundary="=_NextPart_2"; charset="BIG-5"
    + text/plain
    + text/html

=head1 METHODS

Please see L<Email::Simple> for the base set of methods. It won't take
very long. Added to that, you have:

=head1 TODO

All of the Email::MIME-specific guts should move to a single entry on the
object's guts.  This will require changes to both Email::MIME and
L<Email::MIME::Modifier>, sadly.

=head1 SEE ALSO

L<Email::Simple>, L<Email::MIME::Modifier>, L<Email::MIME::Creator>.

=head1 THANKS

This module was generously sponsored by Best Practical
(http://www.bestpractical.com/), Pete Sergeant, and Pobox.com.

=head1 AUTHORS

=over 4

=item *

Ricardo SIGNES <rjbs@cpan.org>

=item *

Casey West <casey@geeknest.com>

=item *

Simon Cozens <simon@cpan.org>

=back

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2004 by Simon Cozens and Casey West.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut