Email::Reply - Reply to a Message

Email-Reply documentation Contained in the Email-Reply distribution.

Index

Code Index:

NAME

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Email::Reply - Reply to a Message

SYNOPSIS

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  use Email::Reply;

  my $message = Email::Simple->new(join '', <>);
  my $from    = (Email::Address->parse($message->header('From'))[0];

  my $reply   = reply to   => $message,
                      from => '"Casey West" <casey@geeknest.com>',
                      all  => 1,
                      body => <<__RESPONSE__;
  Thanks for the message, I'll be glad to explain...
  __RESPONSE__

DESCRIPTION

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This software takes the hard out of generating replies to email messages.

Functions

reply
  my $reply   = reply to       => $message,
                      from     => '"Casey West" <casey@geeknest.com>',
                      all      => 1;
                      self     => 0,
                      attach   => 1,
                      quote    => 1,
                      top_post => 0,
                      keep_sig => 1,
                      prefix   => ': ',
                      attrib   => sprintf("From %s, typer of many words:",
                                          $from->name),
                      body     => <<__RESPONSE__;
  Thanks for the message, I'll be glad to explain the picture...
  __RESPONSE__

This function accepts a number of named parameters and returns an email message object of type Email::MIME or Email::Simple, depending on the parameters passed. Lets review those parameters now.

to - This required parameter is the email message you're replying to. It can represent a number of object types, or a string containing the message. This value is passed directly to Email::Abstract without passing go or collecting $200 so please, read up on its available plugins for what is allowed here.

from - This optional parameter specifies an email address to use indicating the sender of the reply message. It can be a string or an Email::Address object. In the absence of this parameter, the first address found in the original message's To header is used. This may not always be what you want, so this parameter comes highly recommended.

all - This optional parameter indicates weather or not you'd like to "Reply to All." If true, the reply's Cc header will be populated with all the addresses in the original's To and Cc headers. By default, the parameter is false, indicating "Reply to Sender."

self - This optional parameter decides weather or not an address matching the from address will be included in the list of all addresses. If true, your address will be preserved in that list if it is found. If false, as it is by default, your address will be removed from the list. As you might expect, this parameter is only useful if all is true.

attach - This optional parameter allows for the original message, in its entirety, to be encapsulated in a MIME part of type message/rfc822. If true, the returned object from reply will be a Email::MIME object whose second part is the encapsulated message. If false, none of this happens. By default, none of this happens.

quote - This optional parameter, which is true by default, will quote the original message for your reply. If the original message is a MIME message, the first text/plain type part will be quoted. If it's a Simple message, the body will be quoted. Well, that's only if you keep the parameter true. If you don't, none of this occurs.

top_post - This optional parameter, whose use is generally discouraged, will allow top posting when true. It will implicitly set quote to true, and put your body before the quoted text. It is false by default, and you should do your best to keep it that way.

keep_sig - This optional parameter toggles the signature stripping mechanism. True by default, the original quoted body will have its signature removed. When false, the signature is left in-tact and will be quoted accordingly. This is only useful when quote is true.

prefix - This optional parameter specifies the quoting prefix. By default, it's >, but you can change it by setting this parameter. Again, only useful when quote is true.

attrib - This optional parameter specifies the attribution line to add to the beginning of quoted text. By default, the name or email address of the original sender is used to replace %s in the string, "%s wrote:". You may change that with this parameter. No special formats, sprintf() or otherwise, are provided for your convenience. Sorry, you'll have to make due. Like prefix and keep_sig, this is only good when quote is true.

body - This requried parameter contains your prose, your manifesto, your reply. Remember to spell check!

SEE ALSO

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Email::Abstract, Email::MIME, Email::MIME::Creator, Email::Simple::Creator, Email::Address, perl.

AUTHOR

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Casey West, <casey@geeknest.com>.

COPYRIGHT

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  Copyright (c) 2004 Casey West.  All rights reserved.
  This module is free software; you can redistribute it and/or modify it
  under the same terms as Perl itself.
Email-Reply documentation Contained in the Email-Reply distribution. 
package Email::Reply;
use strict;

use Email::Abstract;
use Email::MIME;
use Email::MIME::Creator;
use Email::Simple::Creator;
use Email::Address;
use base qw[Exporter];

use vars qw[$VERSION $CLASS @EXPORT];
$VERSION = '1.202';
$CLASS   = __PACKAGE__;
@EXPORT  = qw[reply];
my $CRLF = "\x0d\x0a";

# Want to subclass and still use the functional interface?
# That's cool, just add these lines to your package:
#    use base qw[Exporter];
#    use vars qw[@EXPORT $CLASS];
#    @EXPORT = qw[reply];
#    $CLASS  = __PACKAGE__;
#    *reply  = \&Email::Reply::reply;

sub reply {
  my $reply = $CLASS->_new(@_);
  $reply->_make_headers;
  $reply->_encapsulate_message if $reply->{attach};
  $reply->_quote_body($reply->{original})
    if $reply->{quote} || $reply->{top_post};
  $reply->_post_reply if $reply->{body};
  return $reply->{message} ? $reply->_mime : $reply->_simple;
}

sub _new {
  my ($class, %args) = @_;
  my $self = {};
  $self->{original} = Email::MIME->new(Email::Abstract->as_string($args{to}));

  ($self->{from}) =
    Email::Address->parse($args{from} || $self->{original}->header('To'));

  ($self->{to}) = Email::Address->parse(
       $self->{original}->header('Reply-To')
    || $self->{original}->header('From')
    || $self->{original}->header('Return-Path')
  );

  $self->{attrib} = $args{attrib}
    || (($self->{to}->name || join($self->{to}->address, '<', '>')) . ' wrote:');

  $self->{prefix}   = $args{prefix} || '> ';
  $self->{top_post} = $args{top_post};
  $self->{quote}    = exists $args{quote} ? $args{quote} : 1;
  $self->{all}      = $args{all};
  $self->{quoted}   = '';
  $self->{body}     = $args{body};
  $self->{attach}   = $args{attach};
  $self->{keep_sig} = $args{keep_sig};

  return bless $self, $class;
}

sub _make_headers {
  my $self = shift;

  my @header = (From => $self->{from},);

  $self->{to}
    ->name((Email::Address->parse($self->{original}->header('From')))[0]->name)
    unless $self->{to}->name;
  push @header, To => $self->{to};

  my $subject = $self->{original}->header('Subject') || '';
  $subject = "Re: $subject" unless $subject =~ /\bRe:/i;
  push @header, Subject => $subject;

  my ($msg_id) = Email::Address->parse($self->{original}->header('Message-ID'));
  push @header, 'In-Reply-To' => $msg_id;

  my @refs = Email::Address->parse($self->{original}->header('References'));
  @refs = Email::Address->parse($self->{original}->header('In-Reply-To'))
    unless @refs;
  push @refs, $msg_id if $msg_id;
  push @header, References => join ' ', @refs if @refs;

  if ($self->{all}) {
    my @addrs = (
      Email::Address->parse($self->{original}->header('To')),
      Email::Address->parse($self->{original}->header('Cc')),
    );
    unless ($self->{self}) {
      @addrs = grep { $_->address ne $self->{from}->address } @addrs;
    }
    push @header, Cc => join ', ', @addrs if @addrs;
  }

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

sub _encapsulate_message {
  my $self = shift;
  $self->{message} = Email::MIME->create(
    attributes => { content_type => 'message/rfc822', },
    body       => $self->{original}->as_string,
  );
}

my $crlf = qr/\x0a\x0d|\x0d\x0a|\x0a|\x0d/;

sub _quote_body {
  my ($self, $part) = @_;
  return if length $self->{quoted};
  return map $self->_quote_body($_), $part->parts if $part->parts > 1;
  return if $part->content_type && $part->content_type !~ m[\btext/plain\b];

  my $body = $part->body;

  $body = ($self->_strip_sig($body) || $body)
    if !$self->{keep_sig} && $body =~ /$crlf--\s*$crlf/o;

  my ($end) = $body =~ /($crlf)/;
  $end ||= $CRLF;
  $body =~ s/[\r\n\s]+$//;
  $body = $self->_quote_orig_body($body);
  $body = "$self->{attrib}$end$body$end";

  $self->{crlf}   = $end;
  $self->{quoted} = $body;
}

# Yes, you are witnessing elitism.
sub _strip_sig { reverse +(split /$crlf\s*--$crlf/o, reverse(pop), 2)[1] }

sub _quote_orig_body {
  my ($self, $body) = @_;
  $body =~ s/($crlf)/$1$self->{prefix}/g;
  "$self->{prefix}$body";
}

sub _post_reply {
  my $self = shift;
  return $self->{reply_body} = $self->{body}
    unless length $self->{quoted};
  my @parts = (@{$self}{qw[quoted body]});
  @parts = reverse @parts if $self->{top_post};
  $self->{reply_body} = join $self->{crlf}, @parts;
}

sub _mime {
  my $self = shift;
  Email::MIME->create(
    header => $self->{header},
    parts =>
      [ Email::MIME->create(body => $self->{reply_body}), $self->{message}, ],
  );
}

sub _simple {
  my $self = shift;
  Email::Simple->create(
    header => $self->{header},
    body   => $self->{reply_body},
  );
}

1;

__END__