| 1 | ###########################################################################
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| 2 | #
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| 3 | # EMAILPlug.pm - a plugin for parsing email files
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| 4 | #
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| 5 | # A component of the Greenstone digital library software
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| 6 | # from the New Zealand Digital Library Project at the
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| 7 | # University of Waikato, New Zealand.
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| 8 | #
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| 9 | # Copyright (C) 1999-2002 New Zealand Digital Library Project
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| 10 | #
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| 11 | # This program is free software; you can redistribute it and/or modify
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| 12 | # it under the terms of the GNU General Public License as published by
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| 13 | # the Free Software Foundation; either version 2 of the License, or
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| 14 | # (at your option) any later version.
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| 15 | #
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| 16 | # This program is distributed in the hope that it will be useful,
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| 17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | # GNU General Public License for more details.
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| 20 | #
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| 21 | # You should have received a copy of the GNU General Public License
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| 22 | # along with this program; if not, write to the Free Software
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| 23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 24 | #
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| 25 | ###########################################################################
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| 26 |
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| 27 |
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| 28 |
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| 29 | # EMAILPlug
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| 30 | #
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| 31 | # by Gordon Paynter ([email protected])
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| 32 | #
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| 33 | # Email plug reads email files. These are named with a simple
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| 34 | # number (i.e. as they appear in maildir folders) or with the
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| 35 | # extension .mbx (for mbox mail file format)
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| 36 | #
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| 37 | # Document text:
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| 38 | # The document text consists of all the text
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| 39 | # after the first blank line in the document.
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| 40 | #
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| 41 | # Metadata (not Dublin Core!):
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| 42 | # $Headers All the header content (optional, not stored by default)
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| 43 | # $Subject Subject: header
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| 44 | # $To To: header
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| 45 | # $From From: header
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| 46 | # $FromName Name of sender (where available)
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| 47 | # $FromAddr E-mail address of sender
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| 48 | # $DateText Date: header
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| 49 | # $Date Date: header in GSDL format (eg: 19990924)
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| 50 | #
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| 51 | # $Title made up of Subject, Date and Sender (for default formatting)
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| 52 | #
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| 53 | #
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| 54 | # John McPherson - June/July 2001
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| 55 | # added (basic) MIME support and quoted-printable and base64 decodings.
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| 56 | # Minor fixes for names that are actually email addresses (ie <...> was lost)
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| 57 | #
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| 58 | # See: * RFC 822 - ARPA Internet Text Messages
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| 59 | # * RFC 2045 - Multipurpose Internet Mail Extensions (MIME) -part1
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| 60 | # * RFC 2046 - MIME (part 2) Media Types (and multipart messages)
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| 61 | # * RFC 2047 - MIME (part 3) Message Header Extensions
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| 62 | # * RFC 1806 - Content Dispositions (ie inline/attachment)
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| 63 |
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| 64 | # 12/05/02 Added usage datastructure - John Thompson
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| 65 |
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| 66 | package EMAILPlug;
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| 67 |
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| 68 | use SplitPlug;
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| 69 |
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| 70 | use unicode;
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| 71 |
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| 72 | use sorttools;
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| 73 | use util;
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| 74 |
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| 75 |
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| 76 | # EMAILPlug is a sub-class of SplitPlug.
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| 77 |
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| 78 | sub BEGIN {
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| 79 | @ISA = ('SplitPlug');
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| 80 | }
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| 81 |
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| 82 | use strict;
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| 83 | no strict "refs"; # so we can use a variable as a filehandle for print $out
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| 84 |
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| 85 | my $arguments =
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| 86 | [ { 'name' => "process_exp",
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| 87 | 'desc' => "{BasPlug.process_exp}",
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| 88 | 'type' => "regexp",
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| 89 | 'reqd' => "no",
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| 90 | 'deft' => &get_default_process_exp() },
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| 91 | { 'name' => "no_attachments",
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| 92 | 'desc' => "{EMAILPlug.no_attachments}",
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| 93 | 'type' => "flag",
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| 94 | 'reqd' => "no" },
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| 95 | { 'name' => "headers",
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| 96 | 'desc' => "{EMAILPlug.headers}",
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| 97 | 'type' => "flag",
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| 98 | 'reqd' => "no" },
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| 99 | { 'name' => "split_exp",
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| 100 | 'desc' => "{EMAILPlug.split_exp}",
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| 101 | 'type' => "regexp",
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| 102 | 'reqd' => "no",
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| 103 | 'deft' => &get_default_split_exp() }
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| 104 | ];
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| 105 |
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| 106 | my $options = { 'name' => "EMAILPlug",
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| 107 | 'desc' => "{EMAILPlug.desc}",
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| 108 | 'abstract' => "no",
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| 109 | 'inherits' => "yes",
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| 110 | 'args' => $arguments };
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| 111 |
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| 112 | # Create a new EMAILPlug object with which to parse a file.
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| 113 | # Accomplished by creating a new BasPlug and using bless to
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| 114 | # turn it into an EMAILPlug.
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| 115 |
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| 116 | sub new {
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| 117 | my ($class) = @_;
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| 118 | my $self = new BasPlug ($class, @_);
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| 119 | $self->{'plugin_type'} = "EMAILPlug";
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| 120 | # 14-05-02 To allow for proper inheritance of arguments - John Thompson
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| 121 | my $option_list = $self->{'option_list'};
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| 122 | push( @{$option_list}, $options );
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| 123 |
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| 124 | if (!parsargv::parse(\@_,
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| 125 | q^split_exp/.*/^, \$self->{'split_exp'},
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| 126 | q^no_attachments^, \$self->{'ignore_attachments'},
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| 127 | q^headers^, \$self->{'header_metadata'},
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| 128 | "allow_extra_options")) {
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| 129 | print STDERR "\nIncorrect options passed to $class.";
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| 130 | print STDERR "\nCheck your collect.cfg configuration file\n";
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| 131 | $self->print_txt_usage(""); # Use default resource bundle
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| 132 | die "\n";
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| 133 | }
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| 134 | $self->{'assoc_filenames'} = {}; # to save attach names so we don't clobber
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| 135 |
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| 136 | # this might not actually be true at read-time, but after processing
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| 137 | # it should all be utf8.
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| 138 | $self->{'input_encoding'}="utf8";
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| 139 | return bless $self, $class;
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| 140 | }
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| 141 |
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| 142 | sub get_default_process_exp {
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| 143 | my $self = shift (@_);
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| 144 | # mbx/email for mailbox file format, \d+ for maildir (each message is
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| 145 | # in a separate file, with a unique number for filename)
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| 146 | # mozilla and IE will save individual mbx format files with a ".eml" ext.
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| 147 | return q@([\\/]\d+|\.(mbx|email|eml))$@;
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| 148 | }
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| 149 |
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| 150 | # This plugin splits the mbox mail files at lines starting with From<sp>
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| 151 | # It is supposed to be "\n\nFrom ", but this isn't always used.
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| 152 | sub get_default_split_exp {
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| 153 | return q^\nFrom .*\n^;
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| 154 |
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| 155 | }
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| 156 |
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| 157 |
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| 158 | # do plugin specific processing of doc_obj
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| 159 | sub process {
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| 160 |
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| 161 | my $self = shift (@_);
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| 162 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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| 163 | my $outhandle = $self->{'outhandle'};
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| 164 |
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| 165 | # Check that we're dealing with a valid mail file
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| 166 | # mbox message files start with "From "
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| 167 | # maildir messages usually start with Return-Path and Delivered-To
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| 168 | # mh is very similar to maildir
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| 169 | my $startoffile=substr($$textref,0,256);
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| 170 | if (($startoffile !~ /^(From )/) &&
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| 171 | ($startoffile !~ /^(From|To|Envelope.*|Received|Return-Path|Date|Subject|Content\-.*|MIME-Version|Forwarded):/im)) {
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| 172 | return undef;
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| 173 | }
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| 174 |
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| 175 |
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| 176 | print STDERR "<Processing n='$file' p='EMAILPlug'>\n" if ($gli);
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| 177 |
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| 178 | print $outhandle "EMAILPlug: processing $file\n"
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| 179 | if $self->{'verbosity'} > 1;
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| 180 |
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| 181 | my $cursection = $doc_obj->get_top_section();
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| 182 |
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| 183 | #
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| 184 | # Parse the document's text and extract metadata
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| 185 | #
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| 186 |
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| 187 | # Protect backslashes
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| 188 | $$textref =~ s@\\@\\\\@g;
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| 189 |
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| 190 | # Separate header from body of message
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| 191 | my $Headers = $$textref;
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| 192 | $Headers =~ s/\r?\n\r?\n(.*)$//s;
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| 193 | $$textref = $1;
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| 194 | $Headers .= "\n";
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| 195 |
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| 196 | # Unfold headers - see rfc822
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| 197 | $Headers =~ s/\r?\n[\t\ ]+/ /gs;
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| 198 | # Extract basic metadata from header
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| 199 | my @headers = ("From", "To", "Subject", "Date");
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| 200 | my %raw;
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| 201 | foreach my $name (@headers) {
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| 202 | $raw{$name} = "No $name value";
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| 203 | }
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| 204 |
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| 205 | # Get a default encoding for the header - RFC says should be ascii...
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| 206 | my $default_header_encoding="iso_8859_1";
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| 207 |
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| 208 | # We don't know what character set is the user's default...
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| 209 | # We could use textcat to guess... for now we'll look at mime content-type
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| 210 | # if ($Headers =~ /([[:^ascii:]])/) {
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| 211 | # }
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| 212 | if ($Headers =~ /^Content\-type:.*charset=\"?([a-z0-9\-_]+)/mi) {
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| 213 | $default_header_encoding=$1;
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| 214 | $default_header_encoding =~ s@\-@_@g;
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| 215 | $default_header_encoding =~ tr/A-Z/a-z/;
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| 216 | }
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| 217 |
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| 218 |
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| 219 | # Examine each line of the headers
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| 220 | my ($line, $name, $value);
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| 221 | my @parts;
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| 222 | foreach $line (split(/\n/, $Headers)) {
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| 223 |
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| 224 | # Ignore lines with no content or which begin with whitespace
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| 225 | next unless ($line =~ /:/);
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| 226 | next if ($line =~ /^\s/);
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| 227 |
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| 228 | # Find out what metadata is on this line
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| 229 | @parts = split(/:/, $line);
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| 230 | $name = shift @parts;
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| 231 | # get fieldname in canonical form - first cap, then lower case.
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| 232 | $name =~ tr/A-Z/a-z/;
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| 233 | # uppercase the first character according to the current locale
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| 234 | $name=~s/(.+)/\u$1/;
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| 235 | next unless $name;
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| 236 | next unless ($raw{$name});
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| 237 |
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| 238 | # Find the value of that metadata
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| 239 | $value = join(":", @parts);
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| 240 | $value =~ s/^\s+//;
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| 241 | $value =~ s/\s+$//;
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| 242 | # decode headers if stored using =?<charset>?[BQ]?<data>?= (rfc2047)
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| 243 | if ($value =~ /=\?.*\?[BbQq]\?.*\?=/) {
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| 244 | my $original_value=$value;
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| 245 | my $encoded=$value;
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| 246 | $value="";
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| 247 | # we should ignore spaces between consecutive encoded-texts
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| 248 | $encoded =~ s@\?=\s+=\?@\?==\?@g;
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| 249 | while ($encoded =~ s/(.*?)=\?([^\?]*)\?([bq])\?([^\?]+)\?=//i) {
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| 250 | my ($charset, $encoding, $data)=($2,$3,$4);
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| 251 | my ($decoded_data);
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| 252 | $value.="$1"; # any leading chars
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| 253 | $data=~s/^\s*//; $data=~s/\s*$//; # strip whitespace from ends
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| 254 | chomp $data;
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| 255 | $encoding =~ tr/BQ/bq/;
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| 256 | if ($encoding eq "q") { # quoted printable
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| 257 | $data =~ s/_/\ /g; # from rfc2047 (sec 4.2.2)
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| 258 | $decoded_data=qp_decode($data);
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| 259 | # qp_decode adds \n, which is default for body text
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| 260 | chomp($decoded_data);
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| 261 | } else { # base 64
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| 262 | $decoded_data=base64_decode($data);
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| 263 | }
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| 264 | $self->convert2unicode($charset, \$decoded_data);
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| 265 | $value .= $decoded_data;
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| 266 | } # end of while loop
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| 267 |
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| 268 | # get any trailing characters
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| 269 | $self->convert2unicode($default_header_encoding, \$encoded);
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| 270 | $value.=$encoded;
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| 271 |
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| 272 | if ($value =~ /^\s*$/) { # we couldn't extract anything...
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| 273 | $self->convert2unicode($default_header_encoding,
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| 274 | \$original_value);
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| 275 | $value=$original_value;
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| 276 | }
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| 277 | } # end of if =?...?=
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| 278 |
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| 279 | # In the absense of other charset information, assume the
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| 280 | # header is the default (usually "iso_8859_1") and convert to unicode.
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| 281 | else {
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| 282 | $self->convert2unicode($default_header_encoding, \$value);
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| 283 | }
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| 284 |
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| 285 | # Store the metadata
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| 286 | $value =~ s@_@\\_@g; # protect against GS macro language
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| 287 | $raw{$name} = $value;
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| 288 | }
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| 289 |
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| 290 | # Extract the name and e-mail address from the From metadata
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| 291 | my $frommeta = $raw{"From"};
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| 292 | my $fromnamemeta;
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| 293 | my $fromaddrmeta;
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| 294 |
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| 295 | $frommeta =~ s/\s*$//; # Remove trailing space, if any
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| 296 |
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| 297 | if ($frommeta =~ m/(.+)\s*<(.+)>/) {
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| 298 | $fromnamemeta=$1;
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| 299 | $fromaddrmeta=$2;
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| 300 | } elsif ($frommeta =~ m/(.+@.+)\s+\((.*)\)/) {
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| 301 | $fromnamemeta=$2;
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| 302 | $fromaddrmeta=$1;
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| 303 | }
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| 304 | if (!defined($fromaddrmeta)) {
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| 305 | $fromaddrmeta=$frommeta;
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| 306 | }
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| 307 | $fromaddrmeta=~s/<//; $fromaddrmeta=~s/>//;
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| 308 | # minor attempt to prevent spam-bots from harvesting addresses...
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| 309 | $fromaddrmeta=~s/@/@/;
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| 310 |
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| 311 | $doc_obj->add_utf8_metadata ($cursection, "FromAddr", $fromaddrmeta);
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| 312 |
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| 313 | if (defined($fromnamemeta) && $fromnamemeta) { # must be > 0 long
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| 314 | $fromnamemeta =~ s/\"//g; # remove quotes
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| 315 | $fromnamemeta =~ s/\s+$//; # remove trailing whitespace
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| 316 | }
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| 317 | else {
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| 318 | $fromnamemeta = $fromaddrmeta;
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| 319 | }
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| 320 | # if name is an address
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| 321 | $fromnamemeta =~ s/<//g; $fromnamemeta =~ s/>//g;
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| 322 | $fromnamemeta=~s/@/@\;/;
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| 323 | $doc_obj->add_utf8_metadata ($cursection, "FromName", $fromnamemeta);
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| 324 |
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| 325 | $raw{"From"}=$frommeta;
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| 326 |
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| 327 | # Process Date information
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| 328 | if ($raw{"Date"} !~ /No Date/) {
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| 329 | $raw{"DateText"} = $raw{"Date"};
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| 330 |
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| 331 | # Convert the date text to internal date format
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| 332 | $value = $raw{"Date"};
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| 333 | my ($day, $month, $year) = $value =~ /(\d?\d)\s([A-Z][a-z][a-z])\s(\d\d\d?\d?)/;
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| 334 | # make some assumptions about the year formatting...
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| 335 | # some (old) software thinks 2001 is 101, some think 2001 is 01
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| 336 | if ($year < 20) { $year += 2000; } # assume not really 1920...
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| 337 | elsif ($year < 150) { $year += 1900; } # assume not really 2150...
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| 338 | $raw{"Date"} = &sorttools::format_date($day, $month, $year);
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| 339 |
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| 340 | } else {
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| 341 | # We have not extracted a date
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| 342 | $raw{"DateText"} = "Unknown.";
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| 343 | $raw{"Date"} = "19000000";
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| 344 | }
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| 345 |
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| 346 | # Add extracted metadata to document object
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| 347 | foreach my $name (keys %raw) {
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| 348 | $value = $raw{$name};
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| 349 | if ($value) {
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| 350 | # assume subject, etc headers have no special HTML meaning.
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| 351 | $value = &text_into_html($value);
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| 352 | # escape [] so it isn't re-interpreted as metadata
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| 353 | $value =~ s/\[/[/g; $value =~ s/\]/]/g;
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| 354 | } else {
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| 355 | $value = "No $name field";
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| 356 | }
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| 357 | $doc_obj->add_utf8_metadata ($cursection, $name, $value);
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| 358 | }
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| 359 |
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| 360 | my $mimetype="text/plain";
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| 361 | my $mimeinfo="";
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| 362 | my $charset = $default_header_encoding;
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| 363 | # Do MIME and encoding stuff. Allow \s in mimeinfo in case there is
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| 364 | # more than one parameter given to Content-type.
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| 365 | # eg: Content-type: text/plain; charset="us-ascii"; format="flowed"
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| 366 | if ($Headers =~ m@^content\-type:\s*([\w\.\-/]+)\s*(\;\s*.+)?\s*$@mi)
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| 367 | {
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| 368 | $mimetype=$1;
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| 369 | $mimetype =~ tr/[A-Z]/[a-z]/;
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| 370 |
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| 371 | if ($mimetype eq "text") { # for pre-RFC2045 messages (c. 1996)
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| 372 | $mimetype = "text/plain";
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| 373 | }
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| 374 |
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| 375 | $mimeinfo=$2;
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| 376 | if (!defined $mimeinfo) {
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| 377 | $mimeinfo="";
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| 378 | } else { # strip leading and trailing stuff
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| 379 | $mimeinfo =~ s/^\;\s*//;
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| 380 | $mimeinfo =~ s/\s*$//;
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| 381 | }
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| 382 | if ($mimeinfo =~ /charset=\"([^\"]+)\"/i) {
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| 383 | $charset = $1;
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| 384 | }
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| 385 | }
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| 386 |
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| 387 | my $transfer_encoding="7bit";
|
|---|
| 388 | if ($Headers =~ /^content-transfer-encoding:\s*([^\s]+)\s*$/mi) {
|
|---|
| 389 | $transfer_encoding=$1;
|
|---|
| 390 | }
|
|---|
| 391 |
|
|---|
| 392 | if ($mimetype eq "text/html") {
|
|---|
| 393 | $$textref= $self->text_from_part("$Headers\n$$textref");
|
|---|
| 394 | } elsif ($mimetype ne "text/plain") {
|
|---|
| 395 | $self->{'doc_obj'} = $doc_obj; # in case we need to associate files...
|
|---|
| 396 | $$textref=$self->text_from_mime_message($mimetype,$mimeinfo,$$textref);
|
|---|
| 397 | } else { # mimetype eq text/plain
|
|---|
| 398 | $$textref = &text_into_html($$textref);
|
|---|
| 399 | $$textref =~ s@_@\\_@g; # protect against GS macro language
|
|---|
| 400 |
|
|---|
| 401 | if ($transfer_encoding =~ /quoted\-printable/) {
|
|---|
| 402 | $$textref=qp_decode($$textref);
|
|---|
| 403 | } elsif ($transfer_encoding =~ /base64/) {
|
|---|
| 404 | $$textref=base64_decode($$textref);
|
|---|
| 405 | }
|
|---|
| 406 | $self->convert2unicode($charset, $textref);
|
|---|
| 407 | }
|
|---|
| 408 |
|
|---|
| 409 |
|
|---|
| 410 | if ($self->{'header_metadata'} && $self->{'header_metadata'} == 1) {
|
|---|
| 411 | # Add "All headers" metadata
|
|---|
| 412 | $Headers = &text_into_html($Headers);
|
|---|
| 413 |
|
|---|
| 414 | $Headers = "No headers" unless ($Headers =~ /\w/);
|
|---|
| 415 | $Headers =~ s/@/@\;/g;
|
|---|
| 416 | # escape [] so it isn't re-interpreted as metadata
|
|---|
| 417 | $Headers =~ s/\[/[/g; $Headers =~ s/\]/]/g;
|
|---|
| 418 | $self->convert2unicode($charset, \$Headers);
|
|---|
| 419 |
|
|---|
| 420 | $Headers =~ s@_@\\_@g; # protect against GS macro language
|
|---|
| 421 | $doc_obj->add_utf8_metadata ($cursection, "Headers", $Headers);
|
|---|
| 422 | }
|
|---|
| 423 |
|
|---|
| 424 |
|
|---|
| 425 | # Add Title metadata
|
|---|
| 426 | my $Title = text_into_html($raw{'Subject'});
|
|---|
| 427 | $Title .= "<br>From: " . text_into_html($raw{'From'});
|
|---|
| 428 | $Title .= "<br>Date: " . text_into_html($raw{'DateText'});
|
|---|
| 429 | $Title =~ s/\[/[/g; $Title =~ s/\]/]/g;
|
|---|
| 430 |
|
|---|
| 431 | $doc_obj->add_utf8_metadata ($cursection, "Title", $Title);
|
|---|
| 432 |
|
|---|
| 433 |
|
|---|
| 434 | # Add text to document object
|
|---|
| 435 | $$textref = "No message" unless ($$textref =~ /\w/);
|
|---|
| 436 |
|
|---|
| 437 | $doc_obj->add_utf8_text($cursection, $$textref);
|
|---|
| 438 |
|
|---|
| 439 | return 1;
|
|---|
| 440 | }
|
|---|
| 441 |
|
|---|
| 442 |
|
|---|
| 443 | # Convert a text string into HTML.
|
|---|
| 444 | #
|
|---|
| 445 | # The HTML is going to be inserted into a GML file, so
|
|---|
| 446 | # we have to be careful not to use symbols like ">",
|
|---|
| 447 | # which ocurs frequently in email messages (and use
|
|---|
| 448 | # > instead.
|
|---|
| 449 | #
|
|---|
| 450 | # This function also turns links and email addresses into hyperlinks,
|
|---|
| 451 | # and replaces carriage returns with <BR> tags (and multiple carriage
|
|---|
| 452 | # returns with <P> tags).
|
|---|
| 453 |
|
|---|
| 454 |
|
|---|
| 455 | sub text_into_html {
|
|---|
| 456 | my ($text) = @_;
|
|---|
| 457 |
|
|---|
| 458 | # Convert problem characters into HTML symbols
|
|---|
| 459 | $text =~ s/&/&/g;
|
|---|
| 460 | $text =~ s/</</g;
|
|---|
| 461 | $text =~ s/>/>/g;
|
|---|
| 462 | $text =~ s/\"/"/g;
|
|---|
| 463 |
|
|---|
| 464 | # convert email addresses and URIs into links
|
|---|
| 465 | # don't markup email addresses for now
|
|---|
| 466 | # $text =~ s/([\w\d\.\-]+@[\w\d\.\-]+)/<a href=\"mailto:$1\">$1<\/a>/g;
|
|---|
| 467 |
|
|---|
| 468 | # try to munge email addresses a little bit...
|
|---|
| 469 | $text =~ s/@/@/;
|
|---|
| 470 | # assume hostnames are \.\w\- only, then might have a trailing '/.*'
|
|---|
| 471 | # assume URI doesn't finish with a '.'
|
|---|
| 472 | $text =~ s@((http|ftp|https)://[\w\-]+(\.[\w\-]+)*/?((&|\.)?[\w\?\=\-_/~]+)*(\#[\w\.\-_]*)?)@<a href=\"$1\">$1<\/a>@g;
|
|---|
| 473 |
|
|---|
| 474 |
|
|---|
| 475 | # Clean up whitespace and convert \n charaters to <BR> or <P>
|
|---|
| 476 | $text =~ s/ +/ /g;
|
|---|
| 477 | $text =~ s/\s*$//g;
|
|---|
| 478 | $text =~ s/^\s*//g;
|
|---|
| 479 | $text =~ s/\n/\n<br>/g;
|
|---|
| 480 | $text =~ s/<br>\s*<br>/<p>/gi;
|
|---|
| 481 |
|
|---|
| 482 | return $text;
|
|---|
| 483 | }
|
|---|
| 484 |
|
|---|
| 485 |
|
|---|
| 486 |
|
|---|
| 487 |
|
|---|
| 488 | #Process a MIME message.
|
|---|
| 489 | # the textref we are given DOES NOT include the header.
|
|---|
| 490 | sub text_from_mime_message {
|
|---|
| 491 | my $self = shift(@_);
|
|---|
| 492 | my ($mimetype,$mimeinfo,$text)=(@_);
|
|---|
| 493 | my $outhandle=$self->{'outhandle'};
|
|---|
| 494 | # Check for multiparts - $mimeinfo will be a boundary
|
|---|
| 495 | if ($mimetype =~ /multipart/) {
|
|---|
| 496 | my $boundary="";
|
|---|
| 497 | if ($mimeinfo =~ m@boundary=(\"[^\"]+\"|[^\s]+)\s*$@im) {
|
|---|
| 498 | $boundary=$1;
|
|---|
| 499 | if ($boundary =~ m@^\"@) {
|
|---|
| 500 | $boundary =~ s@^\"@@; $boundary =~ s@\"$@@;
|
|---|
| 501 | }
|
|---|
| 502 | } else {
|
|---|
| 503 | print $outhandle "EMAILPlug: (warning) couldn't parse MIME boundary\n";
|
|---|
| 504 | }
|
|---|
| 505 | # parts start with "--$boundary"
|
|---|
| 506 | # message ends with "--$boundary--"
|
|---|
| 507 | # RFC says boundary is <70 chars, [A-Za-z'()+_,-./:=?], so escape any
|
|---|
| 508 | # that perl might want to interpolate. Also allows spaces...
|
|---|
| 509 | $boundary=~s/\\/\\\\/g;
|
|---|
| 510 | $boundary=~s/([\?\+\.\(\)\:\/\'])/\\$1/g;
|
|---|
| 511 | my @message_parts = split("\r?\n\-\-$boundary", "\n$text");
|
|---|
| 512 | # remove first "part" and last "part" (final --)
|
|---|
| 513 | shift @message_parts;
|
|---|
| 514 | my $last=pop @message_parts;
|
|---|
| 515 | # if our boundaries are a bit dodgy and we only found 1 part...
|
|---|
| 516 | if (!defined($last)) {$last="";}
|
|---|
| 517 | # make sure it is only -- and whitespace
|
|---|
| 518 | if ($last !~ /^\-\-\s*$/ms) {
|
|---|
| 519 | print $outhandle "EMAILPlug: (warning) last part of MIME message isn't empty\n";
|
|---|
| 520 | }
|
|---|
| 521 | foreach my $message_part (@message_parts) {
|
|---|
| 522 | # remove the leading newline left from split.
|
|---|
| 523 | $message_part=~s/^\r?\n//;
|
|---|
| 524 | }
|
|---|
| 525 | if ($mimetype eq "multipart/alternative") {
|
|---|
| 526 | # check for an HTML version first, then TEXT, otherwise use first.
|
|---|
| 527 | my $part_text="";
|
|---|
| 528 | foreach my $message_part (@message_parts) {
|
|---|
| 529 | if ($message_part =~ m@\s*content\-type:\s*text/html@mis)
|
|---|
| 530 | {
|
|---|
| 531 | # Use the HTML version
|
|---|
| 532 | $part_text= $self->text_from_part($message_part);
|
|---|
| 533 | $mimetype="text/html";
|
|---|
| 534 | last;
|
|---|
| 535 | }
|
|---|
| 536 | }
|
|---|
| 537 | if ($part_text eq "") { # try getting a text part instead
|
|---|
| 538 | foreach my $message_part (@message_parts) {
|
|---|
| 539 | if ($message_part =~ m@^content\-type:\s*text/plain@mis)
|
|---|
| 540 | {
|
|---|
| 541 | # Use the plain version
|
|---|
| 542 | $part_text= $self->text_from_part($message_part);
|
|---|
| 543 | if ($part_text =~/[^\s]/) {
|
|---|
| 544 | $part_text = text_into_html($part_text);
|
|---|
| 545 | }
|
|---|
| 546 | $mimetype="text/plain";
|
|---|
| 547 | last;
|
|---|
| 548 | }
|
|---|
| 549 | }
|
|---|
| 550 | }
|
|---|
| 551 | if ($part_text eq "") { #use first part (no html/text part found)
|
|---|
| 552 | $part_text = $self->text_from_part(shift @message_parts);
|
|---|
| 553 | $part_text = text_into_html($part_text);
|
|---|
| 554 | }
|
|---|
| 555 | if ($part_text eq "") { # we couldn't get anything!!!
|
|---|
| 556 | # or it was an empty message...
|
|---|
| 557 | # do nothing...
|
|---|
| 558 | print $outhandle "EMAILPlug: no text - empty body?\n";
|
|---|
| 559 | } else {
|
|---|
| 560 | $text = $part_text;
|
|---|
| 561 | }
|
|---|
| 562 | } elsif ($mimetype =~ m@multipart/(mixed|digest|related|signed)@) {
|
|---|
| 563 | $text = "";
|
|---|
| 564 | # signed is for PGP/GPG messages... the last part is a hash
|
|---|
| 565 | if ($mimetype =~ m@multipart/signed@) {
|
|---|
| 566 | pop @message_parts;
|
|---|
| 567 | }
|
|---|
| 568 | my $is_first_part=1;
|
|---|
| 569 | foreach my $message_part (@message_parts) {
|
|---|
| 570 | if ($is_first_part && $text ne "") {$is_first_part=0;}
|
|---|
| 571 |
|
|---|
| 572 | if ($mimetype eq "multipart/digest") {
|
|---|
| 573 | # default type - RTFRFC!! Set if not already set
|
|---|
| 574 | $message_part =~ m@^(.*)\n\r?\n@s;
|
|---|
| 575 | my $part_header=$1;
|
|---|
| 576 | if ($part_header !~ m@^content-type@mi) {
|
|---|
| 577 | $message_part="Content-type: message/rfc822\n"
|
|---|
| 578 | . $message_part; # prepend default type
|
|---|
| 579 | }
|
|---|
| 580 | }
|
|---|
| 581 |
|
|---|
| 582 | $text .= $self->process_multipart_part($message_part,
|
|---|
| 583 | $is_first_part);
|
|---|
| 584 | } # foreach message part.
|
|---|
| 585 | } else {
|
|---|
| 586 | # we can't handle this multipart type (not mixed or alternative)
|
|---|
| 587 | # the RFC also mentions "parallel".
|
|---|
| 588 | }
|
|---|
| 589 | } # end of ($mimetype =~ multipart)
|
|---|
| 590 | elsif ($mimetype =~ m@message/rfc822@) {
|
|---|
| 591 | my $msg_header = $text;
|
|---|
| 592 | $msg_header =~ s/\r?\n\r?\n(.*)$//s;
|
|---|
| 593 | $text = $1;
|
|---|
| 594 |
|
|---|
| 595 | if ($msg_header =~ /^content\-type:\s*([\w\.\-\/]+)\s*\;?\s*(.+?)\s*$/mi)
|
|---|
| 596 | {
|
|---|
| 597 | $mimetype=$1;
|
|---|
| 598 | $mimetype =~ tr/[A-Z]/[a-z]/;
|
|---|
| 599 | $mimeinfo=$2;
|
|---|
| 600 | #if ($mimeinfo =~ /charset=\"([^\"]+)\"/) {
|
|---|
| 601 | # $charset = $1;
|
|---|
| 602 | #}
|
|---|
| 603 | my $msg_text;
|
|---|
| 604 | if ($mimetype =~ m@multipart/@) {
|
|---|
| 605 | $msg_text = text_from_mime_message($self, $mimetype, $mimeinfo,
|
|---|
| 606 | $text);
|
|---|
| 607 | } else {$msg_text=text_from_part($text);}
|
|---|
| 608 |
|
|---|
| 609 | my $brief_header=text_into_html(get_brief_headers($msg_header));
|
|---|
| 610 | $text= "\n<b><<attached message>></b><br>";
|
|---|
| 611 | $text.= "<table><tr><td width=\"5%\"> </td>\n";
|
|---|
| 612 | $text.="<td>" . $brief_header . "\n</p>" . $msg_text
|
|---|
| 613 | . "</td></tr></table>";
|
|---|
| 614 | }
|
|---|
| 615 | } else {
|
|---|
| 616 | # we don't do any processing of the content.
|
|---|
| 617 | }
|
|---|
| 618 |
|
|---|
| 619 | return $text;
|
|---|
| 620 | }
|
|---|
| 621 |
|
|---|
| 622 |
|
|---|
| 623 |
|
|---|
| 624 |
|
|---|
| 625 | sub process_multipart_part {
|
|---|
| 626 | my $self = shift;
|
|---|
| 627 | my $message_part = shift;
|
|---|
| 628 | my $is_first_part = shift;
|
|---|
| 629 |
|
|---|
| 630 | my $return_text="";
|
|---|
| 631 | my $part_header=$message_part;
|
|---|
| 632 | my $part_body;
|
|---|
| 633 | if ($message_part=~ /^\s*\n/) {
|
|---|
| 634 | # no header... use defaults
|
|---|
| 635 | $part_body=$message_part;
|
|---|
| 636 | $part_header="Content-type: text/plain; charset=us-ascii";
|
|---|
| 637 | } elsif ($part_header=~s/\r?\n\r?\n(.*)$//s) {
|
|---|
| 638 | $part_body=$1;
|
|---|
| 639 | } else {
|
|---|
| 640 | # something's gone wrong...
|
|---|
| 641 | $part_header="";
|
|---|
| 642 | $part_body=$message_part;
|
|---|
| 643 | }
|
|---|
| 644 |
|
|---|
| 645 | $part_header =~ s/\r?\n[\t\ ]+/ /gs; #unfold
|
|---|
| 646 | my $part_content_type="";
|
|---|
| 647 | my $part_content_info="";
|
|---|
| 648 |
|
|---|
| 649 | if ($part_header =~ m@^content\-type:\s*([\w\.\-/]+)\s*(\;.*)?$@mi) {
|
|---|
| 650 | $part_content_type=$1; $part_content_type =~ tr/A-Z/a-z/;
|
|---|
| 651 | $part_content_info=$2;
|
|---|
| 652 | if (!defined($part_content_info)) {
|
|---|
| 653 | $part_content_info="";
|
|---|
| 654 | } else {
|
|---|
| 655 | $part_content_info =~ s/^\;\s*//;
|
|---|
| 656 | $part_content_info =~ s/\s*$//;
|
|---|
| 657 | }
|
|---|
| 658 | }
|
|---|
| 659 | my $filename="";
|
|---|
| 660 | if ($part_header =~ m@name=\"?([^\"\n]+)\"?@mis) {
|
|---|
| 661 | $filename=$1;
|
|---|
| 662 | $filename =~ s@\r?\s*$@@; # remove trailing space, if any
|
|---|
| 663 | }
|
|---|
| 664 |
|
|---|
| 665 | # disposition - either inline or attachment.
|
|---|
| 666 | # NOT CURRENTLY USED - we display all text types instead...
|
|---|
| 667 | # $part_header =~ /^content\-disposition:\s*([\w+])/mis;
|
|---|
| 668 |
|
|---|
| 669 | # add <<attachment>> to each part except the first...
|
|---|
| 670 | if (!$is_first_part) {
|
|---|
| 671 | $return_text.="\n<p><hr><strong><<attachment>>";
|
|---|
| 672 | # add part info header
|
|---|
| 673 | my $header_text="<br>Type: $part_content_type<br>\n";
|
|---|
| 674 | if ($filename ne "") {
|
|---|
| 675 | $header_text.="Filename: $filename\n";
|
|---|
| 676 | }
|
|---|
| 677 | $header_text =~ s@_@\\_@g;
|
|---|
| 678 | $return_text.=$header_text . "</strong></p>\n<p>\n";
|
|---|
| 679 | }
|
|---|
| 680 |
|
|---|
| 681 | if ($part_content_type =~ m@text/@)
|
|---|
| 682 | {
|
|---|
| 683 | my $part_text= $self->text_from_part($message_part);
|
|---|
| 684 | if ($part_content_type !~ m@text/(ht|x)ml@) {
|
|---|
| 685 | $part_text = text_into_html($part_text);
|
|---|
| 686 | }
|
|---|
| 687 | if ($part_text eq "") {
|
|---|
| 688 | $part_text = ' ';
|
|---|
| 689 | }
|
|---|
| 690 | $return_text .= $part_text;
|
|---|
| 691 | } elsif ($part_content_type =~ m@message/rfc822@) {
|
|---|
| 692 | # This is a forwarded message
|
|---|
| 693 | my $message_part_headers=$part_body;
|
|---|
| 694 | $message_part_headers=~s/\r?\n\r?\n(.*)$//s;
|
|---|
| 695 | my $message_part_body=$1;
|
|---|
| 696 | $message_part_headers =~ s/\r?\n[\t\ ]+/ /gs; #unfold
|
|---|
| 697 |
|
|---|
| 698 | my $rfc822_formatted_body=""; # put result in here
|
|---|
| 699 | if ($message_part_headers =~
|
|---|
| 700 | /^content\-type:\s*([\w\.\-\/]+)\s*(\;.*)?$/ims)
|
|---|
| 701 | {
|
|---|
| 702 | # The message header uses MIME flags
|
|---|
| 703 | my $message_content_type=$1;
|
|---|
| 704 | my $message_content_info=$2;
|
|---|
| 705 | if (!defined($message_content_info)) {
|
|---|
| 706 | $message_content_info="";
|
|---|
| 707 | } else {
|
|---|
| 708 | $message_content_info =~ s/^\;\s*//;
|
|---|
| 709 | $message_content_info =~ s/\s*$//;
|
|---|
| 710 | }
|
|---|
| 711 | $message_content_type =~ tr/A-Z/a-z/;
|
|---|
| 712 | if ($message_content_type =~ /multipart/) {
|
|---|
| 713 | $rfc822_formatted_body=
|
|---|
| 714 | $self->text_from_mime_message($message_content_type,
|
|---|
| 715 | $message_content_info,
|
|---|
| 716 | $message_part_body);
|
|---|
| 717 | } else {
|
|---|
| 718 | $message_part_body= $self->text_from_part($part_body);
|
|---|
| 719 | $rfc822_formatted_body=text_into_html($message_part_body);
|
|---|
| 720 | }
|
|---|
| 721 | } else {
|
|---|
| 722 | # message doesn't use MIME flags
|
|---|
| 723 | $rfc822_formatted_body=text_into_html($message_part_body);
|
|---|
| 724 | $rfc822_formatted_body =~ s@_@\\_@g;
|
|---|
| 725 | }
|
|---|
| 726 | # Add the returned text to the output
|
|---|
| 727 | # don't put all the headers...
|
|---|
| 728 | # $message_part_headers =~ s/^(X\-.*|received|message\-id|return\-path):.*\n//img;
|
|---|
| 729 | my $brief_headers=get_brief_headers($message_part_headers);
|
|---|
| 730 | $return_text.=text_into_html($brief_headers);
|
|---|
| 731 | $return_text.="</p><p>\n";
|
|---|
| 732 | $return_text.=$rfc822_formatted_body;
|
|---|
| 733 | $return_text.="</p>\n";
|
|---|
| 734 | # end of message/rfc822
|
|---|
| 735 | } elsif ($part_content_type =~ /multipart/) {
|
|---|
| 736 | # recurse again
|
|---|
| 737 |
|
|---|
| 738 | my $tmptext= $self->text_from_mime_message($part_content_type,
|
|---|
| 739 | $part_content_info,
|
|---|
| 740 | $part_body);
|
|---|
| 741 | $return_text.=$tmptext;
|
|---|
| 742 | } else {
|
|---|
| 743 | # this part isn't text/* or another message...
|
|---|
| 744 | if ($is_first_part) {
|
|---|
| 745 | # this is the first part of a multipart, or only part!
|
|---|
| 746 | $return_text="\n<p><hr><strong><<attachment>>";
|
|---|
| 747 | # add part info header
|
|---|
| 748 | my $header_text="<br>Type: $part_content_type<br>\n";
|
|---|
| 749 | $header_text.="Filename: $filename</strong></p>\n<p>\n";
|
|---|
| 750 | $header_text =~ s@_@\\_@g;
|
|---|
| 751 | $return_text.=$header_text;
|
|---|
| 752 | }
|
|---|
| 753 |
|
|---|
| 754 | # save attachment by default
|
|---|
| 755 | if (!$self->{'ignore_attachments'}
|
|---|
| 756 | && $filename ne "") { # this part has a file...
|
|---|
| 757 | my $encoding="8bit";
|
|---|
| 758 | if ($part_header =~
|
|---|
| 759 | /^content-transfer-encoding:\s*(\w+)/mi ) {
|
|---|
| 760 | $encoding=$1; $encoding =~ tr/A-Z/a-z/;
|
|---|
| 761 | }
|
|---|
| 762 | my $tmpdir=$ENV{'GSDLHOME'} . "/tmp";
|
|---|
| 763 | my $save_filename=$filename;
|
|---|
| 764 |
|
|---|
| 765 | # make sure we don't clobber files with same name;
|
|---|
| 766 | # need to keep state between .mbx files
|
|---|
| 767 | my $assoc_files=$self->{'assoc_filenames'};
|
|---|
| 768 | if ($assoc_files->{$filename}) { # it's been set...
|
|---|
| 769 | $assoc_files->{$filename}++;
|
|---|
| 770 | $filename =~ m/(.+)\.(\w+)$/;
|
|---|
| 771 | my ($filestem, $ext)=($1,$2);
|
|---|
| 772 | $save_filename="${filestem}_"
|
|---|
| 773 | . $assoc_files->{$filename} . ".$ext";
|
|---|
| 774 | } else { # first file with this name
|
|---|
| 775 | $assoc_files->{$filename}=1;
|
|---|
| 776 | }
|
|---|
| 777 | open (SAVE, ">$tmpdir/$save_filename") ||
|
|---|
| 778 | warn "EMAILPlug: Can't save attachment as $tmpdir/$save_filename: $!";
|
|---|
| 779 | my $part_text = $message_part;
|
|---|
| 780 | $part_text =~ s/(.*?)\r?\n\r?\n//s; # remove header
|
|---|
| 781 | if ($encoding eq "base64") {
|
|---|
| 782 | print SAVE base64_decode($part_text);
|
|---|
| 783 | } elsif ($encoding eq "quoted-printable") {
|
|---|
| 784 | print SAVE qp_decode($part_text);
|
|---|
| 785 | } else { # 7bit, 8bit, binary, etc...
|
|---|
| 786 | print SAVE $part_text;
|
|---|
| 787 | }
|
|---|
| 788 | close SAVE;
|
|---|
| 789 | my $doc_obj=$self->{'doc_obj'};
|
|---|
| 790 | $doc_obj->associate_file("$tmpdir/$save_filename",
|
|---|
| 791 | "$save_filename",
|
|---|
| 792 | $part_content_type # mimetype
|
|---|
| 793 | );
|
|---|
| 794 | # clean up tmp area...
|
|---|
| 795 | # Can't do this as it hasn't been copied/linked yet!!!
|
|---|
| 796 | # &util::rm("$tmpdir/$save_filename");
|
|---|
| 797 | my $outhandle=$self->{'outhandle'};
|
|---|
| 798 | print $outhandle "EMAILPlug: saving attachment \"$filename\"\n"; #
|
|---|
| 799 |
|
|---|
| 800 | # be nice if "download" was a translatable macro :(
|
|---|
| 801 | $return_text .="<a href=\"_httpdocimg_/$save_filename\">download</a>";
|
|---|
| 802 | } # end of save attachment
|
|---|
| 803 | } # end of !text/message part
|
|---|
| 804 |
|
|---|
| 805 |
|
|---|
| 806 | return $return_text;
|
|---|
| 807 | }
|
|---|
| 808 |
|
|---|
| 809 |
|
|---|
| 810 | # Return only the "important" headers from a set of message headers
|
|---|
| 811 | sub get_brief_headers {
|
|---|
| 812 | my $msg_header = shift;
|
|---|
| 813 | my $brief_header = "";
|
|---|
| 814 |
|
|---|
| 815 | # Order matters!
|
|---|
| 816 | if ($msg_header =~ /^(From:.*)$/im) {$brief_header.="$1\n";}
|
|---|
| 817 | if ($msg_header =~ /^(To:.*)$/im) {$brief_header.="$1\n";}
|
|---|
| 818 | if ($msg_header =~ /^(Cc:.*)$/im) {$brief_header.="$1\n";}
|
|---|
| 819 | if ($msg_header =~ /^(Subject:.*)$/im) {$brief_header.="$1\n";}
|
|---|
| 820 | if ($msg_header =~ /^(Date:.*)$/im) {$brief_header.="$1\n";}
|
|---|
| 821 |
|
|---|
| 822 | return $brief_header;
|
|---|
| 823 | }
|
|---|
| 824 |
|
|---|
| 825 |
|
|---|
| 826 | # Process a MIME part. Return "" if we can't decode it.
|
|---|
| 827 | # should only be called for parts with type "text/*" ?
|
|---|
| 828 | sub text_from_part {
|
|---|
| 829 | my $self = shift;
|
|---|
| 830 | my $text = shift || '';
|
|---|
| 831 | my $part_header = $text;
|
|---|
| 832 |
|
|---|
| 833 | # check for empty part header (leading blank line)
|
|---|
| 834 | if ($text =~ /^\s*\r?\n/) {
|
|---|
| 835 | $part_header="Content-type: text/plain; charset=us-ascii";
|
|---|
| 836 | } else {
|
|---|
| 837 | $part_header =~ s/\r?\n\r?\n(.*)$//s;
|
|---|
| 838 | $text=$1; if (!defined($text)) {$text="";}
|
|---|
| 839 | }
|
|---|
| 840 | $part_header =~ s/\r?\n[\t ]+/ /gs; #unfold
|
|---|
| 841 | $part_header =~ /content\-type:\s*([\w\.\-\/]+).*?charset=\"?([^\;\"\s]+)\"?/is;
|
|---|
| 842 | my $type=$1;
|
|---|
| 843 | my $charset=$2;
|
|---|
| 844 | if (!defined($type)) {$type="";}
|
|---|
| 845 | if (!defined($charset)) {$charset="ascii";}
|
|---|
| 846 | my $encoding="";
|
|---|
| 847 | if ($part_header =~ /^content\-transfer\-encoding:\s*([^\s]+)/mis) {
|
|---|
| 848 | $encoding=$1; $encoding=~tr/A-Z/a-z/;
|
|---|
| 849 | }
|
|---|
| 850 | # Content-Transfer-Encoding is per-part
|
|---|
| 851 | if ($encoding ne "") {
|
|---|
| 852 | if ($encoding =~ /quoted\-printable/) {
|
|---|
| 853 | $text=qp_decode($text);
|
|---|
| 854 | } elsif ($encoding =~ /base64/) {
|
|---|
| 855 | $text=base64_decode($text);
|
|---|
| 856 | } elsif ($encoding !~ /[78]bit/) { # leave 7/8 bit as is.
|
|---|
| 857 | # rfc2045 also allows binary, which we ignore (for now).
|
|---|
| 858 | my $outhandle=$self->{'outhandle'};
|
|---|
| 859 | print $outhandle "EMAILPlug: unknown transfer encoding: $encoding\n";
|
|---|
| 860 | return "";
|
|---|
| 861 | }
|
|---|
| 862 | }
|
|---|
| 863 | if ($type eq "text/html") {
|
|---|
| 864 | # only get stuff between <body> tags, or <html> tags.
|
|---|
| 865 | $text =~ s@^.*<html[^>]*>@@is;
|
|---|
| 866 | $text =~ s@</html>.*$@@is;
|
|---|
| 867 | $text =~ s/^.*?<body[^>]*>//si;
|
|---|
| 868 | $text =~ s/<\/body>.*$//si;
|
|---|
| 869 | }
|
|---|
| 870 | elsif ($type eq "text/xml") {
|
|---|
| 871 | $text=~s/</</g;$text=~s/>/>/g;
|
|---|
| 872 | $text="<pre>\n$text\n</pre>\n";
|
|---|
| 873 | }
|
|---|
| 874 | # convert to unicode
|
|---|
| 875 | $self->convert2unicode($charset, \$text);
|
|---|
| 876 |
|
|---|
| 877 | $text =~ s@_@\\_@g; # protect against GS macro language
|
|---|
| 878 | return $text;
|
|---|
| 879 | }
|
|---|
| 880 |
|
|---|
| 881 |
|
|---|
| 882 |
|
|---|
| 883 |
|
|---|
| 884 | # decode quoted-printable text
|
|---|
| 885 | sub qp_decode {
|
|---|
| 886 | my $text=shift;
|
|---|
| 887 |
|
|---|
| 888 | # if a line ends with "=\s*", it is a soft line break, otherwise
|
|---|
| 889 | # keep in any newline characters.
|
|---|
| 890 |
|
|---|
| 891 | $text =~ s/=\s*\r?\n//mg;
|
|---|
| 892 | $text =~ s/=([0-9A-Fa-f]{2})/chr (hex "0x$1")/eg;
|
|---|
| 893 | return $text;
|
|---|
| 894 | }
|
|---|
| 895 |
|
|---|
| 896 | # decode base64 text. This is fairly slow (since it's interpreted perl rather
|
|---|
| 897 | # than compiled XS stuff like in the ::MIME modules, but this is more portable
|
|---|
| 898 | # for us at least).
|
|---|
| 899 | # see rfc2045 for description, but basically, bits 7 and 8 are set to zero;
|
|---|
| 900 | # 4 bytes of encoded text become 3 bytes of binary - remove 2 highest bits
|
|---|
| 901 | # from each encoded byte.
|
|---|
| 902 |
|
|---|
| 903 |
|
|---|
| 904 | sub base64_decode {
|
|---|
| 905 | my $enc_text = shift;
|
|---|
| 906 | # A=>0, B=>1, ..., '+'=>62, '/'=>63
|
|---|
| 907 | # also '=' is used for padding at the end, but we remove it anyway.
|
|---|
| 908 | my $mimechars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
|---|
| 909 | # map each MIME char into it's value, for more efficient lookup.
|
|---|
| 910 | my %index;
|
|---|
| 911 | map { $index{$_} = index ($mimechars, $_) } (split ('', $mimechars));
|
|---|
| 912 | # remove all non-base64 chars. eval to get variable in transliteration...
|
|---|
| 913 | # also remove '=' - we'll assume (!!) that there are no errors in the encoding
|
|---|
| 914 | eval "\$enc_text =~ tr|$mimechars||cd";
|
|---|
| 915 | my $decoded="";
|
|---|
| 916 | while (length ($enc_text)>3)
|
|---|
| 917 | {
|
|---|
| 918 | my $fourchars=substr($enc_text,0,4,"");
|
|---|
| 919 | my @chars=(split '',$fourchars);
|
|---|
| 920 | $decoded.=chr( $index{$chars[0]} << 2 | $index{$chars[1]} >> 4);
|
|---|
| 921 | $decoded.=chr( ($index{$chars[1]} & 15) << 4 | $index{$chars[2]} >> 2);
|
|---|
| 922 | $decoded.=chr( ($index{$chars[2]} & 3 ) << 6 | $index{$chars[3]});
|
|---|
| 923 | }
|
|---|
| 924 | # if there are any input chars left, there are either
|
|---|
| 925 | # 2 encoded bytes (-> 1 raw byte) left or 3 encoded (-> 2 raw) bytes left.
|
|---|
| 926 | my @chars=(split '',$enc_text);
|
|---|
| 927 | if (length($enc_text)) {
|
|---|
| 928 | $decoded.=chr($index{$chars[0]} << 2 | (int $index{$chars[1]} >> 4));
|
|---|
| 929 | }
|
|---|
| 930 | if (length($enc_text)==3) {
|
|---|
| 931 | $decoded.=chr( ($index{$chars[1]} & 15) << 4 | $index{$chars[2]} >> 2);
|
|---|
| 932 | }
|
|---|
| 933 | return $decoded;
|
|---|
| 934 | }
|
|---|
| 935 |
|
|---|
| 936 | sub convert2unicode {
|
|---|
| 937 | my $self = shift(@_);
|
|---|
| 938 | my ($charset, $textref) = @_;
|
|---|
| 939 |
|
|---|
| 940 | # first get our character encoding name in the right form.
|
|---|
| 941 | $charset = "iso_8859_1" unless defined $charset;
|
|---|
| 942 | $charset=~tr/A-Z/a-z/;
|
|---|
| 943 | $charset=~s/\-/_/g;
|
|---|
| 944 | $charset=~s/gb2312/gb/;
|
|---|
| 945 | # assumes EUC-KR, not ISO-2022 !?
|
|---|
| 946 | $charset=~s/ks_c_5601_1987/korean/;
|
|---|
| 947 |
|
|---|
| 948 | if ($charset eq "utf_8" || !$$textref) {
|
|---|
| 949 | # nothing to do!
|
|---|
| 950 | return;
|
|---|
| 951 | }
|
|---|
| 952 |
|
|---|
| 953 | # It appears that we can't always trust ascii text so we'll treat it
|
|---|
| 954 | # as iso-8859-1 (letting characters above 0x80 through without
|
|---|
| 955 | # converting them to utf-8 will result in invalid XML documents
|
|---|
| 956 | # which can't be parsed at build time).
|
|---|
| 957 | $charset = "iso_8859_1" if ($charset eq "us_ascii" || $charset eq "ascii");
|
|---|
| 958 |
|
|---|
| 959 | if ($charset eq "iso_8859_1") {
|
|---|
| 960 | # test if the mailer lied, and it has win1252 chars in it...
|
|---|
| 961 | # 1252 has characters between 0x80 and 0x9f, 8859-1 doesn't
|
|---|
| 962 | if ($$textref =~ m/[\x80-\x9f]/) {
|
|---|
| 963 | my $outhandle = $self->{'outhandle'};
|
|---|
| 964 | print $outhandle "EMAILPlug: Headers claim ISO charset but MS ";
|
|---|
| 965 | print $outhandle "codepage 1252 detected.\n";
|
|---|
| 966 | $charset = "windows_1252";
|
|---|
| 967 | }
|
|---|
| 968 | }
|
|---|
| 969 | my $utf8_text=&unicode::unicode2utf8(&unicode::convert2unicode($charset,$textref));
|
|---|
| 970 |
|
|---|
| 971 | if ($utf8_text ne "") {
|
|---|
| 972 | $$textref=$utf8_text;
|
|---|
| 973 | } else {
|
|---|
| 974 | # we didn't get any text... unsupported encoding perhaps? Or it is
|
|---|
| 975 | # empty anyway. We'll try to continue, assuming 8859-1. We could strip
|
|---|
| 976 | # characters out here if this causes problems...
|
|---|
| 977 | my $outhandle=$self->{'outhandle'};
|
|---|
| 978 | print $outhandle "EMAILPlug: falling back to iso-8859-1\n";
|
|---|
| 979 | $$textref=&unicode::unicode2utf8(&unicode::convert2unicode("iso_8859_1",$textref));
|
|---|
| 980 |
|
|---|
| 981 | }
|
|---|
| 982 | }
|
|---|
| 983 |
|
|---|
| 984 |
|
|---|
| 985 | # Perl packages have to return true if they are run.
|
|---|
| 986 | 1;
|
|---|
