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#=====================================================================
# LX-Office ERP
# Copyright (C) 2004
# Based on SQL-Ledger Version 2.1.9
# Web http://www.lx-office.org
#
#=====================================================================
#
# 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., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1335, USA.
#======================================================================

package Mailer;

use IO::Socket::INET;
use IO::Socket::SSL;
use Email::Address;
use Email::MIME::Creator;
use Encode;
use File::MimeInfo::Magic;
use File::Slurp;
use List::UtilsBy qw(bundle_by);
use List::Util qw(sum);

use SL::Common;
use SL::DB::EmailJournal;
use SL::DB::EmailJournalAttachment;
use SL::DB::Employee;
use SL::Locale::String qw(t8);
use SL::Template;
use SL::Version;
use SL::IMAPClient;

use strict;

my $num_sent = 0;

my %mail_delivery_modules = (
sendmail => 'SL::Mailer::Sendmail',
smtp => 'SL::Mailer::SMTP',
);

my %type_to_table = (
sales_quotation => 'oe',
request_quotation => 'oe',
sales_order => 'oe',
purchase_order => 'oe',
invoice => 'ar',
credit_note => 'ar',
purchase_invoice => 'ap',
letter => 'letter',
purchase_delivery_order => 'delivery_orders',
sales_delivery_order => 'delivery_orders',
dunning => 'dunning',
);
my %type_to_email = (
sales_quotation => sub { $::instance_conf->get_email_sender_sales_quotation },
request_quotation => sub { $::instance_conf->get_email_sender_request_quotation },
sales_order => sub { $::instance_conf->get_email_sender_sales_order },
purchase_order => sub { $::instance_conf->get_email_sender_purchase_order },
invoice => sub { $::instance_conf->get_email_sender_invoice },
credit_note => sub { $::instance_conf->get_email_sender_invoice },
purchase_invoice => sub { $::instance_conf->get_email_sender_purchase_invoice },
letter => sub { $::instance_conf->get_email_sender_letter },
purchase_delivery_order => sub { $::instance_conf->get_email_sender_purchase_delivery_order },
sales_delivery_order => sub { $::instance_conf->get_email_sender_sales_delivery_order },
dunning => sub { $::instance_conf->get_email_sender_dunning },
);


sub new {
my ($type, %params) = @_;
my $self = { %params };

bless $self, $type;
}

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

my %params = (
mailer => $self,
form => $::form,
myconfig => \%::myconfig,
);

my $module = $mail_delivery_modules{ $::lx_office_conf{mail_delivery}->{method} };
eval "require $module" or return undef;

return $module->new(%params);
}

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

foreach my $item (qw(to cc bcc)) {
next unless $self->{$item};

$self->{$item} =~ s/\&lt;/</g;
$self->{$item} =~ s/\$<\$/</g;
$self->{$item} =~ s/\&gt;/>/g;
$self->{$item} =~ s/\$>\$/>/g;
}
}

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

$num_sent += 1;
my $domain = $self->{from};
$domain =~ s/.*\@//;
$domain =~ s/>.*//;

return "kivitendo-" . SL::Version->get_version . "-" . time() . "-${$}-${num_sent}\@$domain";
}

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

# $self->{addresses} collects the recipients for use in e.g. the
# SMTP 'RCPT TO:' envelope command. $self->{headers} collects the
# headers that make up the actual email. 'BCC' should not be
# included there for certain transportation methods (SMTP).

$self->{addresses} = {};

foreach my $item (qw(from to cc bcc)) {
$self->{addresses}->{$item} = [];
next if !$self->{$item};

my @header_addresses;
my @addresses = Email::Address->parse($self->{$item});

# if either no address was parsed or
# there are more than 3 characters per parsed email extra, assume the the user has entered bunk
if (!@addresses) {
die t8('"#1" seems to be a faulty list of email addresses. No addresses could be extracted.',
$self->{$item},
);
} elsif ((length($self->{$item}) - sum map { length $_->original } @addresses) / @addresses > 3) {
die t8('"#1" seems to be a faulty list of email addresses. After extracing addresses (#2) too many characters are left.',
$self->{$item}, join ', ', map { $_->original } @addresses,
);
}

foreach my $addr_obj (@addresses) {
push @{ $self->{addresses}->{$item} }, $addr_obj->address;
next if $self->{driver}->keep_from_header($item);

my $phrase = $addr_obj->phrase();
if ($phrase) {
$phrase =~ s/^\"//;
$phrase =~ s/\"$//;
$addr_obj->phrase($phrase);
}

push @header_addresses, $addr_obj->format;
}

push @{ $self->{headers} }, ( ucfirst($item) => join(', ', @header_addresses) ) if @header_addresses;
}
}

sub _create_attachment_part {
my ($self, $attachment) = @_;

my %attributes = (
disposition => 'attachment',
encoding => 'base64',
);

my $attachment_content;
my $file_id = 0;
my $email_journal = $::instance_conf->get_email_journal;

if (ref($attachment) eq "HASH") {
$attributes{filename} = $attachment->{name};
$file_id = $attachment->{id} || '0';
$attributes{content_type} = $attachment->{type} || 'application/pdf';
$attachment_content = $attachment->{content};
$attachment_content = eval { read_file($attachment->{path}) } if !$attachment_content;

} else {
$attributes{filename} = $attachment;
$attributes{filename} =~ s:.*\Q$self->{fileid}\E:: if $self->{fileid};
$attributes{filename} =~ s:.*/::g;

my $application = ($attachment =~ /(^\w+$)|\.(html|text|txt|sql)$/) ? 'text' : 'application';
$attributes{content_type} = File::MimeInfo::Magic::magic($attachment);
$attributes{content_type} ||= "${application}/$self->{format}" if $self->{format};
$attributes{content_type} ||= 'application/octet-stream';
$attachment_content = eval { read_file($attachment) };
}

return undef if $email_journal > 1 && !defined $attachment_content;

$attachment_content ||= ' ';
$attributes{charset} = $self->{charset} if $self->{charset} && ($attributes{content_type} =~ m{^text/});

my $ent;
if ( $attributes{content_type} eq 'message/rfc822' ) {
$ent = Email::MIME->new($attachment_content);
} else {
$ent = Email::MIME->create(
attributes => \%attributes,
body => $attachment_content,
);
}

# Due to a bug in Email::MIME it's not enough to hand over the encoded file name in the "attributes" hash in the
# "create" call. Email::MIME iterates over the keys in the hash, and depending on which key it has already seen during
# the iteration it might revert the encoding. As Perl's hash key order is randomized for each Perl run, this means
# that the file name stays unencoded sometimes.
# Setting the header manually after the "create" call circumvents this problem.
$ent->header_set('Content-disposition' => 'attachment; filename="' . encode('MIME-Q', $attributes{filename}) . '"');

push @{ $self->{mail_attachments}} , SL::DB::EmailJournalAttachment->new(
name => $attributes{filename},
mime_type => $attributes{content_type},
content => ( $email_journal > 1 ? $attachment_content : ' '),
file_id => $file_id,
);

return $ent;
}

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

my @parts;

if ($self->{message}) {
push @parts, Email::MIME->create(
attributes => {
content_type => $self->{content_type},
charset => $self->{charset},
encoding => 'quoted-printable',
},
body_str => $self->{message},
);

push @{ $self->{headers} }, (
'Content-Type' => qq|$self->{content_type}; charset="$self->{charset}"|,
);
}

push @parts, grep { $_ } map { $self->_create_attachment_part($_) } @{ $self->{attachments} || [] };

return Email::MIME->create(
header_str => $self->{headers},
parts => \@parts,
);
}

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

# Create driver for delivery method (sendmail/SMTP)
$self->{driver} = eval { $self->_create_driver };
if (!$self->{driver}) {
my $error = $@;
$self->_store_in_journal('send_failed', 'driver could not be created; check your configuration & log files');
$::lxdebug->message(LXDebug::WARN(), "Mailer error during 'send': $error");

return $error;
}
$self->_default_from; # set from for records if configured in client config
# Set defaults & headers
$self->{charset} = 'UTF-8';
$self->{content_type} ||= "text/plain";
$self->{headers} ||= [];
push @{ $self->{headers} }, (
Subject => $self->{subject},
'Message-ID' => '<' . $self->_create_message_id . '>',
'X-Mailer' => "kivitendo " . SL::Version->get_version,
);
$self->{mail_attachments} = [];

my $email_as_string;
my $error;
my $ok = eval {
# Clean up To/Cc/Bcc address fields
$self->_cleanup_addresses;
$self->_create_address_headers;

my $email = $self->_create_message;

my $from_obj = (Email::Address->parse($self->{from}))[0];

$self->{driver}->start_mail(from => $from_obj->address, to => [ $self->_all_recipients ]);
$self->{driver}->print($email->as_string);
$self->{driver}->send;

$email_as_string = $email->as_string;
1;
};

$error = $@ if !$ok;

# TODO: Error is not for sending emial
# in SL::Form->send_email error is treated as error for sending email
if ($ok) {
eval {$self->_store_in_imap_sent_folder($email_as_string); 1} or do {
$ok = 0;
$error = $@;
};
}

# create journal and link to record
$self->{journalentry} = $self->_store_in_journal;
$self->_create_record_link if $self->{journalentry};

return $ok ? '' : ($error || "undefined error");
}

sub _all_recipients {
my ($self) = @_;
$self->{addresses} ||= {};
return map { @{ $self->{addresses}->{$_} || [] } } qw(to cc bcc);
}

sub _get_header_string {
my ($self) = @_;
my $header_string =
join "\r\n",
(bundle_by { join(': ', @_) } 2, @{ $self->{headers} || [] });
return $header_string;
}

sub _store_in_imap_sent_folder {
my ($self, $email_as_string) = @_;

my $from_email = $self->{from};
my $user_email = $::myconfig{email};
my $imap_config =
$::lx_office_conf{"sent_emails_in_imap/email/$from_email"}
|| $::lx_office_conf{"sent_emails_in_imap/email/$user_email"}
|| $::lx_office_conf{sent_emails_in_imap}
|| {};
return unless ($imap_config->{enabled});

my $folder = delete $imap_config->{folder};
my $imap_client = SL::IMAPClient->new(%$imap_config);
$imap_client->store_email_in_email_folder(
email_as_string => $email_as_string,
folder => $folder ||'Sent/Kivitendo',
);

return 1;
}

sub _store_in_journal {
my ($self, $status, $extended_status) = @_;

my $journal_enable = $::instance_conf->get_email_journal;

return if $journal_enable == 0;

$status //= $self->{driver}->status if $self->{driver};
$status //= 'send_failed';
$extended_status //= $self->{driver}->extended_status if $self->{driver};
$extended_status //= 'unknown error';

my $headers = $self->_get_header_string;

my $jentry = SL::DB::EmailJournal->new(
sender => SL::DB::Manager::Employee->current,
from => $self->{from} // '',
recipients => join(', ', $self->_all_recipients),
subject => $self->{subject} // '',
headers => $headers,
body => $self->{message} // '',
sent_on => DateTime->now_local,
attachments => \@{ $self->{mail_attachments} },
status => $status,
extended_status => $extended_status,
)->save;
return $jentry->id;
}


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

# check for custom/overloaded types and ids (form != controller)
my $record_type = $self->{record_type} || $::form->{type} || '';
my $record_id = $self->{record_id} || $::form->{id};

# you may send mails for unsaved objects (no record_id => unlinkable case)
if ($self->{journalentry} && $record_id && exists($type_to_table{$record_type})) {
RecordLinks->create_links(
mode => 'ids',
from_table => $type_to_table{$record_type},
from_ids => $record_id,
to_table => 'email_journal',
to_id => $self->{journalentry},
);
}
}


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

my $record_type = $self->{record_type} || $::form->{type} || $self->{driver}{form}{formname} || '';
my $record_email = exists $type_to_email{$record_type} ? $type_to_email{$record_type}->() : undef;
$self->{from} = $record_email if $record_email;
}

1;


__END__

=pod

=encoding utf8

=head1 NAME

SL::Mailer - Base class for sending mails from kivitendo

=head1 SYNOPSIS

package SL::BackgroundJob::CreatePeriodicInvoices;

use SL::Mailer;

my $mail = Mailer->new;
$mail->{from} = $config{periodic_invoices}->{email_from};
$mail->{to} = $email;
$mail->{subject} = $config{periodic_invoices}->{email_subject};
$mail->{content_type} = $filename =~ m/.html$/ ? 'text/html' : 'text/plain';
$mail->{message} = $output;

$mail->send;

=head1 OVERVIEW

Mail can be sent from kivitendo via the sendmail command or the smtp protocol.


=head1 INTERNAL DATA TYPES


=over 2

=item C<%mail_delivery_modules>

Currently two modules are supported: smtp or sendmail.

=item C<%type_to_table>

Due to the lack of a single global mapping for $form->{type},
type is mapped to the corresponding database table. All types which
implement a mail action are currently mapped and should be mapped.
Type is either the value of the old form or the newer controller
based object type.

=back

=head1 FUNCTIONS

=over 4

=item C<new>

=item C<_create_driver>

=item C<_cleanup_addresses>

=item C<_create_address_headers>

=item C<_create_message_id>

=item C<_create_attachment_part>

=item C<_create_message>

=item C<send>

If a mail was sent successfully the internal function _store_in_journal
is called if email journaling is enabled. If _store_in_journal was executed
successfully and the calling form is already persistent (database id) a
record_link will be created.

=item C<_all_recipients>

=item C<_store_in_journal>

=item C<_create_record_link $self->{journalentry}, $::form->{id}, $self->{record_id}>


If $self->{journalentry} and either $self->{record_id} or $::form->{id} (checked in
this order) exist a record link from record to email journal is created.
It is possible to provide an array reference with more than one id in
$self->{record_id} or $::form->{id}. In this case all records are linked to
the mail.
Will fail silently if record_link creation wasn't successful (same behaviour as
_store_in_journal).

=item C<validate>

=back

=head1 BUGS

Nothing here yet.

=head1 AUTHOR

=cut
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