| 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 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:
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| 42 | # $Headers All the header content
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| 43 | # $Subject Subject: header
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| 44 | # $To To: header
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| 45 | # $From From: header - this will be stored as Creator
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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 | #
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| 52 | # John McPherson - June/July 2001
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| 53 | # added (basic) MIME support and quoted-printable and base64 decodings.
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| 54 | # Minor fixes for names that are actually email addresses (ie <...> was lost)
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| 55 | #
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| 56 | # See: * RFC 822 - ARPA Internet Text Messages
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| 57 | # * RFC 2045 - Multipurpose Internet Mail Extensions (MIME) -part1
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| 58 | # * RFC 2046 - MIME (part 2) Media Types (and multipart messages)
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| 59 | # * RFC 1806 - Content Dispositions (ie inline/attachment)
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| 60 | package EMAILPlug;
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| 61 |
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| 62 | use SplitPlug;
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| 63 |
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| 64 | use sorttools;
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| 65 | use util;
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| 66 |
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| 67 |
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| 68 | # EMAILPlug is a sub-class of SplitPlug.
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| 69 |
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| 70 | sub BEGIN {
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| 71 | @ISA = ('SplitPlug');
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| 72 | }
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| 73 |
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| 74 | # Create a new EMAILPlug object with which to parse a file.
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| 75 | # Accomplished by creating a new BasPlug and using bless to
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| 76 | # turn it into an EMAILPlug.
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| 77 |
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| 78 | sub new {
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| 79 | my ($class) = @_;
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| 80 | my $self = new BasPlug ("EMAILPlug", @_);
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| 81 | # make sure we don't run textcat (defaults to "auto");
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| 82 | $self->{'input_encoding'}="ascii";
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| 83 | return bless $self, $class;
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| 84 | }
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| 85 |
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| 86 | sub get_default_process_exp {
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| 87 | my $self = shift (@_);
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| 88 | # mbx/email for mailbox file format, \d+ for maildir (each message is
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| 89 | # in a separate file, with a unique number for filename)
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| 90 | return q@([\\/]\d+|\.(mbx|email))$@;
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| 91 | }
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| 92 |
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| 93 | # This plugin splits the mbox mail files at lines starting with From<sp>
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| 94 | sub get_default_split_exp {
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| 95 | return q^\nFrom .*\n^;
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| 96 | }
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| 97 |
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| 98 |
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| 99 | # do plugin specific processing of doc_obj
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| 100 | sub process {
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| 101 |
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| 102 | my $self = shift (@_);
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| 103 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj) = @_;
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| 104 | my $outhandle = $self->{'outhandle'};
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| 105 |
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| 106 | # Check that we're dealing with a valid mail file
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| 107 | return undef unless (($$textref =~ /From:/m) || ($$textref =~ /To:/m));
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| 108 |
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| 109 | # slightly more strict validity check, to prevent us from matching
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| 110 | # .so.x files ...
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| 111 | return undef unless (($$textref =~ /^From /) ||
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| 112 | ($$textref =~ /^[-A-Za-z]{2,100}:/m));
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| 113 |
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| 114 | print $outhandle "EMAILPlug: processing $file\n"
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| 115 | if $self->{'verbosity'} > 1;
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| 116 |
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| 117 | my $cursection = $doc_obj->get_top_section();
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| 118 |
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| 119 | #
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| 120 | # Parse the document's text and extract metadata
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| 121 | #
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| 122 |
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| 123 | # Separate header from body of message
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| 124 | my $Headers = $$textref;
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| 125 | $Headers =~ s/\r?\n\r?\n(.*)$//s;
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| 126 | $$textref = $1;
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| 127 |
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| 128 | # Unfold headers - see rfc822
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| 129 | $Headers =~ s/\r?\n[\t\ ]+/ /gs;
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| 130 | # Extract basic metadata from header
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| 131 | my @headers = ("From", "To", "Subject", "Date");
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| 132 | my %raw;
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| 133 | foreach my $name (@headers) {
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| 134 | $raw{$name} = "No $name value";
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| 135 | }
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| 136 |
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| 137 | # Examine each line of the headers
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| 138 | my ($line, $name, $value);
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| 139 | my @parts;
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| 140 | foreach $line (split(/\n/, $Headers)) {
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| 141 |
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| 142 | # Ignore lines with no content or which begin with whitespace
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| 143 | next unless ($line =~ /:/);
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| 144 | next if ($line =~ /^\s/);
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| 145 |
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| 146 | # Find out what metadata is on this line
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| 147 | @parts = split(/:/, $line);
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| 148 | $name = shift @parts;
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| 149 | # uppercase the first character according to the current locale
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| 150 | $name=~s/(.+)/\u$1/;
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| 151 | next unless $name;
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| 152 | next unless ($raw{$name});
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| 153 |
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| 154 | # Find the value of that metadata
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| 155 | $value = join(":", @parts);
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| 156 | $value =~ s/^\s+//;
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| 157 | $value =~ s/\s+$//;
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| 158 |
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| 159 | # Store the metadata
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| 160 | $raw{$name} = $value;
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| 161 | }
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| 162 |
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| 163 | # Extract the name and e-mail address from the From metadata
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| 164 | $frommeta = $raw{"From"};
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| 165 | $frommeta =~ m/(.*)<(.*)>/;
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| 166 | my $fromnamemeta=$1;
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| 167 | my $fromaddrmeta=$2;
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| 168 | if (!defined($fromaddrmeta)) {
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| 169 | $fromaddrmeta=$frommeta;
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| 170 | }
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| 171 | $doc_obj->add_utf8_metadata ($cursection, "FromAddr", $fromaddrmeta);
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| 172 |
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| 173 | if (defined($fromnameneta)) {
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| 174 | $fromnamemeta =~ s/\"//g;
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| 175 | $fromnamemeta =~ s/(.*) /$1/; # Remove trailing space
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| 176 | }
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| 177 | else {
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| 178 | $fromnamemeta = $fromaddrmeta;
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| 179 | }
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| 180 | # if name is an address
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| 181 | $fromnamemeta =~ s/<//g; $fromnamemeta =~ s/>//g;
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| 182 | $doc_obj->add_utf8_metadata ($cursection, "FromName", $fromnamemeta);
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| 183 |
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| 184 | # Escape < and > in the whole From field;
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| 185 | $frommeta =~ s/</</g; $frommeta =~ s/>/>/g;
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| 186 | $raw{"From"}=$frommeta;
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| 187 |
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| 188 | # Process Date information
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| 189 | if ($raw{"Date"} !~ /No Date/) {
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| 190 | $raw{"DateText"} = $raw{"Date"};
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| 191 |
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| 192 | # Convert the date text to internal date format
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| 193 | $value = $raw{"Date"};
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| 194 | my ($day, $month, $year) = $value =~ /(\d?\d)\s([A-Z][a-z][a-z])\s(\d\d\d?\d?)/;
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| 195 | if ($year < 100) { $year += 1900; }
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| 196 | $raw{"Date"} = &sorttools::format_date($day, $month, $year);
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| 197 |
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| 198 | } else {
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| 199 | # We have not extracted a date
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| 200 | $raw{"DateText"} = "Unknown.";
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| 201 | $raw{"Date"} = "19000000";
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| 202 | }
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| 203 |
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| 204 |
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| 205 | # Add extracted metadata to document object
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| 206 | foreach my $name (keys %raw) {
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| 207 | $value = $raw{$name};
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| 208 | if ($value) {
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| 209 | $value = &text_into_html($value);
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| 210 | } else {
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| 211 | $value = "No $name field";
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| 212 | }
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| 213 | $doc_obj->add_utf8_metadata ($cursection, $name, $value);
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| 214 | }
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| 215 |
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| 216 | my $mimetype="text/plain";
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| 217 | my $mimeinfo="";
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| 218 | # Do MIME and encoding stuff
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| 219 | if ($Headers =~ /^content\-type:\s*([\w\/\-]+)\s*\;?\s*([^\s]+)\s*$/mi)
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| 220 | {
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| 221 | $mimetype=$1;
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| 222 | $mimetype =~ tr/[A-Z]/[a-z]/;
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| 223 | $mimeinfo=$2;
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| 224 | }
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| 225 |
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| 226 | if ($mimetype ne "text/plain") {
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| 227 | $$textref=text_from_mime_message($mimetype,$mimeinfo,$$textref);
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| 228 | } # end of not text/plain
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| 229 |
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| 230 |
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| 231 | # Add "All headers" metadata
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| 232 | $Headers = &text_into_html($Headers);
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| 233 | $Headers = "No headers" unless ($Headers =~ /\w/);
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| 234 | $doc_obj->add_utf8_metadata ($cursection, "Headers", $Headers);
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| 235 |
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| 236 | # Add text to document object
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| 237 | if ($mimetype eq "text/plain") {
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| 238 | $$textref = &text_into_html($$textref);
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| 239 | }
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| 240 | $$textref = "No message" unless ($$textref =~ /\w/);
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| 241 | $doc_obj->add_utf8_text($cursection, $$textref);
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| 242 |
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| 243 | return 1;
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| 244 | }
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| 245 |
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| 246 |
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| 247 | # Convert a text string into HTML.
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| 248 | #
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| 249 | # The HTML is going to be inserted into a GML file, so
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| 250 | # we have to be careful not to use symbols like ">",
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| 251 | # which ocurs frequently in email messages (and use
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| 252 | # > instead.
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| 253 | #
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| 254 | # This function also turns links and email addresses into hyperlinks,
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| 255 | # and replaces carriage returns with <BR> tags (and multiple carriage
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| 256 | # returns with <P> tags).
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| 257 |
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| 258 |
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| 259 | sub text_into_html {
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| 260 | my ($text) = @_;
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| 261 |
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| 262 | # Convert problem characters into HTML symbols
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| 263 | $text =~ s/&/&/go;
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| 264 | $text =~ s/</</go;
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| 265 | $text =~ s/>/>/go;
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| 266 | $text =~ s/\"/"/go;
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| 267 |
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| 268 | # convert email addresses and URIs into links
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| 269 | # don't markup email addresses for now
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| 270 | # $text =~ s/([\w\d\.\-]+@[\w\d\.\-]+)/<a href=\"mailto:$1\">$1<\/a>/g;
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| 271 |
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| 272 | # assume hostnames are \.\w\d\- only, then might have a trailing '/.*'
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| 273 | # URI can't finish with a '.'
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| 274 | $text =~ s/((http|ftp|https):\/\/[\w\d\-]+(\.[\w\d\-]+)*\/?((&|\.)?[\w\d\?\=\-_\/~]+)*)/<a href=\"$1\">$1<\/a>/g;
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| 275 |
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| 276 |
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| 277 | # Clean up whitespace and convert \n charaters to <BR> or <P>
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| 278 | $text =~ s/ +/ /go;
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| 279 | $text =~ s/\s*$//o;
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| 280 | $text =~ s/^\s*//o;
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| 281 | $text =~ s/\n/\n<BR>/go;
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| 282 | $text =~ s/<BR>\s*<BR>/<P>/go;
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| 283 |
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| 284 | return $text;
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| 285 | }
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| 286 |
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| 287 |
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| 288 |
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| 289 |
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| 290 | #Process a MIME message.
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| 291 | # the textref we are given DOES NOT include the header.
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| 292 | sub text_from_mime_message {
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| 293 | my ($mimetype,$mimeinfo,$text)=(@_);
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| 294 |
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| 295 | # Check for multiparts - $mimeinfo will be a boundary
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| 296 | if ($mimetype =~ /multipart/) {
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| 297 | $boundary="";
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| 298 | if ($mimeinfo =~ /boundary="?([^\s]+?)"?\s*$/im) {
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| 299 | $boundary=$1;
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| 300 | }
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| 301 | # parts start with "--$boundary"
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| 302 | # message ends with "--$boundary--"
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| 303 | # RFC says boundary is <70 chars, [A-Za-z'()+_,-./:=?], so escape any
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| 304 | # that perl might want to interpolate.
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| 305 |
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| 306 | $boundary=~s/\\/\\\\/g;
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| 307 | $boundary=~s/([\?\+\.\(\)\:\/\'])/\\$1/g;
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| 308 | my @message_parts = split("\r?\n\-\-$boundary", $text);
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| 309 | # remove first "part" and last "part" (final --)
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| 310 | shift @message_parts;
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| 311 | my $last=pop @message_parts;
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| 312 | # make sure it is only -- and whitespace
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| 313 | if ($last !~ /^\-\-\s*$/ms) {
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| 314 | print $outhandle "EMAILPlug: (warning) last part of MIME message isn't empty\n";
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| 315 | }
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| 316 | foreach my $message_part (@message_parts) {
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| 317 | # remove the leading newline left from split.
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| 318 | $message_part=~s/^\r?\n//;
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| 319 | }
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| 320 | if ($mimetype eq "multipart/alternative") {
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| 321 | # check for an HTML version first, then TEXT, otherwise use first.
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| 322 | my $part_text="";
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| 323 | foreach my $message_part (@message_parts) {
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| 324 | if ($message_part =~ m@\s*content\-type:\s*text/html@mis)
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| 325 | {
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| 326 | # Use the HTML version
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| 327 | $part_text=text_from_part($message_part);
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| 328 | $mimetype="text/html";
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| 329 | last;
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| 330 | }
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| 331 | }
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| 332 | if ($part_text eq "") { # try getting a text part instead
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| 333 | foreach my $message_part (@message_parts) {
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| 334 | if ($message_part =~ m@^content\-type:\s*text/plain@mis)
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| 335 | {
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| 336 | # Use the plain version
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| 337 | $part_text=text_from_part($message_part);
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| 338 | $mimetype="text/plain";
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| 339 | last;
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| 340 | }
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| 341 | }
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| 342 | }
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| 343 | if ($part_text eq "") { # use first part
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| 344 | $part_text=text_from_part(shift @message_parts);
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| 345 | }
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| 346 | if ($part_text eq "") { # we couldn't get anything!!!
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| 347 | # or it was an empty message...
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| 348 | # do nothing...
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| 349 | print $outhandle "EMAILPlug: no text - empty body?\n";
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| 350 | } else {
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| 351 | $text=$part_text;
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| 352 | }
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| 353 | } elsif ($mimetype eq "multipart/mixed" ||
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| 354 | $mimetype eq "multipart/digest") {
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| 355 | $text="";
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| 356 | foreach my $message_part (@message_parts) {
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| 357 | my $part_header=$message_part;
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| 358 | $part_header=~s/\r?\n\r?\n(.*)$//sg;
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| 359 | my $part_body=$1;
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| 360 | $part_header =~ s/\r?\n[\t\ ]+/ /gs; #unfold
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| 361 | my $part_content_type="";
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| 362 | my $part_content_info="";
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| 363 | if ($mimetype eq "multipart/digest") {
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| 364 | # default type - RTFRFC!!
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| 365 | $part_content_type="message/rfc822";
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| 366 | }
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| 367 | if ($part_header =~ m@^content\-type:\s*([\w+/\-]+)\s*\;?\s*([^\s]+)@mi) {
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| 368 | $part_content_type=$1; $part_content_type =~ tr/A-Z/a-z/;
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| 369 | $part_content_info=$2;
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| 370 | }
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| 371 | my $filename="";
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| 372 | if ($part_header =~ m@name=\"?([\w\.\-\\/]+)\"?@mis) {
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| 373 | $filename=$1;
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| 374 | }
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| 375 |
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| 376 | # disposition - either inline or attachment.
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| 377 | # NOT CURRENTLY USED - we display all text types instead...
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| 378 | # $part_header =~ /^content\-disposition:\s*([\w+])/mis;
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| 379 |
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| 380 | # add <<attachment>> to each part except the first...
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| 381 | if ($text ne "") {
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| 382 | $text.="<p><hr><strong><<attachment>></>";
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| 383 | # add part info header
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| 384 | $text.="<br>Type: $part_content_type<br>\n";
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| 385 | if ($filename ne "") {
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| 386 | $text.="Filename: $filename\n";
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| 387 | }
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| 388 | $text.="</strong></p>\n";
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| 389 | }
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| 390 |
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| 391 | if ($part_content_type =~ m@text/@)
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| 392 | {
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| 393 | my $part_text=text_from_part($message_part);
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| 394 | if ($part_content_type !~ m@text/(ht|x)ml@) {
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| 395 | $part_text=text_into_html($part_text);
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| 396 | }
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| 397 | if ($part_text eq "") {
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| 398 | $part_text='<<empty message>>';
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| 399 | }
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| 400 | $text.=$part_text;
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| 401 | } elsif ($part_content_type =~ m@message/rfc822@) {
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| 402 | # This is a forwarded message
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| 403 | my $message_part_headers=$part_body;
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| 404 | $message_part_headers =~ s/\r?\n[\t\ ]+/ /gs; #unfold
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| 405 | $message_part_headers=~s/\r?\n\r?\n(.*)$//s;
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| 406 | my $message_part_body=$1;
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| 407 |
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| 408 | my $rfc822_formatted_body=""; # put result in here
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| 409 | if ($message_part_headers =~
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| 410 | /^content\-type:\s*([\w\/\-]+)\s*\;?\s*?([^\s]+)?\s*$/ims)
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| 411 | {
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| 412 | # The message header uses MIME flags
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| 413 | my $message_content_type=$1;
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| 414 | my $message_content_info=$2;
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| 415 | if (!defined($message_content_info)) {
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| 416 | $message_content_info="";
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| 417 | }
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| 418 | $message_content_type =~ tr/A-Z/a-z/;
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| 419 | if ($message_content_type =~ /multipart/) {
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| 420 | $rfc822_formatted_body=
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| 421 | text_from_mime_message($message_content_type,
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| 422 | $message_content_info,
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| 423 | $message_part_body);
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| 424 | } else {
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| 425 | $message_part_body=text_from_part($part_body);
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| 426 | $rfc822_formatted_body=text_into_html($message_part_body);
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| 427 | }
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| 428 | } else {
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| 429 | # message doesn't use MIME flags
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| 430 | $rfc822_formatted_body=text_into_html($message_part_body);
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| 431 | }
|
|---|
| 432 | # Add the returned text to the output
|
|---|
| 433 | # don't put all the headers...
|
|---|
| 434 | $message_part_headers =~ s/^(X\-.*|received|message\-id|return\-path):.*\n//img;
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| 435 | $text.=text_into_html($message_part_headers);
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| 436 | $text.="<p>\n";
|
|---|
| 437 | $text.=$rfc822_formatted_body;
|
|---|
| 438 | # end of message/rfc822
|
|---|
| 439 | } elsif ($part_content_type =~ /multipart/) {
|
|---|
| 440 | # recurse again
|
|---|
| 441 | $tmptext=text_from_mime_message($part_content_type,
|
|---|
| 442 | $part_content_info,
|
|---|
| 443 | $part_body);
|
|---|
| 444 | $text.=$tmptext;
|
|---|
| 445 | } elsif ($text eq "") {
|
|---|
| 446 | # we can't do anything with this part, but if it's the first
|
|---|
| 447 | # part then make sure it is mentioned..
|
|---|
| 448 |
|
|---|
| 449 | $text.="<p><hr><strong><<attachment>></>";
|
|---|
| 450 | # add part info header
|
|---|
| 451 | $text.="<br>Type: $part_content_type<br>\n";
|
|---|
| 452 | if ($filename ne "") {
|
|---|
| 453 | $text.="Filename: $filename\n";
|
|---|
| 454 | }
|
|---|
| 455 | $text.="</strong></p>\n";
|
|---|
| 456 | }
|
|---|
| 457 | } # foreach message part.
|
|---|
| 458 | } else {
|
|---|
| 459 | # we can't handle this multipart type (not mixed or alternative)
|
|---|
| 460 | # the RFC also mentions "parallel".
|
|---|
| 461 | }
|
|---|
| 462 | } # end of multipart
|
|---|
| 463 | return $text;
|
|---|
| 464 | }
|
|---|
| 465 |
|
|---|
| 466 |
|
|---|
| 467 |
|
|---|
| 468 |
|
|---|
| 469 |
|
|---|
| 470 |
|
|---|
| 471 | # Process a MIME part. Return "" if we can't decode it.
|
|---|
| 472 | sub text_from_part {
|
|---|
| 473 | my $text=shift;
|
|---|
| 474 | my $part_header=$text;
|
|---|
| 475 | $part_header =~ s/\r?\n\r?\n(.*)$//s;
|
|---|
| 476 | $text=$1;
|
|---|
| 477 | $part_header =~ s/\r?\n[\t ]+/ /gs; #unfold
|
|---|
| 478 | $part_header =~ /content\-type:\s*([\w\/]+)/is;
|
|---|
| 479 | my $type=$1;
|
|---|
| 480 | my $encoding="";
|
|---|
| 481 | if ($part_header =~ /^content\-transfer\-encoding:\s*([^s]+)/mis) {
|
|---|
| 482 | $encoding=$1; $encoding=~tr/A-Z/a-z/;
|
|---|
| 483 | }
|
|---|
| 484 | # Content-Transfer-Encoding is per-part
|
|---|
| 485 | if ($encoding ne "") {
|
|---|
| 486 | if ($encoding =~ /quoted\-printable/) {
|
|---|
| 487 | $text=qp_decode($text);
|
|---|
| 488 | } elsif ($encoding =~ /base64/) {
|
|---|
| 489 | $text=base64_decode($text);
|
|---|
| 490 | } elsif ($encoding !~ /[78]bit/) { # leave 7/8 bit as is.
|
|---|
| 491 | # rfc2045 also allows binary, which we ignore (for now).
|
|---|
| 492 | # maybe this shouldn't go to stderr, but anyway...
|
|---|
| 493 | print STDERR "EMAILPlug: unknown encoding: $encoding\n";
|
|---|
| 494 | return "";
|
|---|
| 495 | }
|
|---|
| 496 | }
|
|---|
| 497 |
|
|---|
| 498 | if ($type eq "text/html") {
|
|---|
| 499 | # only get stuff between <body> tags, or <html> tags.
|
|---|
| 500 | $text =~ s/^.*?<(html|HTML)[^>]*>//s;
|
|---|
| 501 | $text =~ s/<\/(html|HTML)>.*$//s;
|
|---|
| 502 |
|
|---|
| 503 | $text =~ s/^.*?<(body|BODY)[^>]*>//s;
|
|---|
| 504 | $text =~ s/<\/(body|BODY)>.*$//s;
|
|---|
| 505 | }
|
|---|
| 506 | elsif ($type eq "text/xml") {
|
|---|
| 507 | $text=~s/</</g;$text=~s/>/>/g;
|
|---|
| 508 | $text="<pre>\n$text\n</pre>\n";
|
|---|
| 509 | }
|
|---|
| 510 | return $text;
|
|---|
| 511 | }
|
|---|
| 512 |
|
|---|
| 513 |
|
|---|
| 514 | # decode quoted-printable text
|
|---|
| 515 | sub qp_decode {
|
|---|
| 516 | my $text=shift;
|
|---|
| 517 |
|
|---|
| 518 | my @lines=split('\n', $text);
|
|---|
| 519 |
|
|---|
| 520 | # if a line ends with "=\s*", it is a soft line break, otherwise
|
|---|
| 521 | # keep in any newline characters.
|
|---|
| 522 | foreach my $line (@lines) {
|
|---|
| 523 | if ($line =~ s/=\s*$//) {}
|
|---|
| 524 | else {$line.="\n";}
|
|---|
| 525 |
|
|---|
| 526 | if ($line =~ /=[0-9A-Fa-f]{2}/) { # it contains an escaped char
|
|---|
| 527 | my @hexcode_segments=split('=',$line);
|
|---|
| 528 | shift @hexcode_segments;
|
|---|
| 529 | my @hexcodes;
|
|---|
| 530 | foreach my $hexcode (@hexcode_segments) {
|
|---|
| 531 | $hexcode =~ s/^(..).*$/$1/; # only need first 2 chars
|
|---|
| 532 | chomp($hexcode); # just in case...
|
|---|
| 533 | my $char=chr (hex "0x$hexcode");
|
|---|
| 534 | $line =~ s/=$hexcode/$char/g;
|
|---|
| 535 | }
|
|---|
| 536 | }
|
|---|
| 537 | }
|
|---|
| 538 | $text= join('', @lines);
|
|---|
| 539 | return $text;
|
|---|
| 540 | }
|
|---|
| 541 |
|
|---|
| 542 | # decode base64 text. This is fairly slow (since it's interpreted perl rather
|
|---|
| 543 | # than compiled XS stuff like in the ::MIME modules, but this is more portable
|
|---|
| 544 | # for us at least).
|
|---|
| 545 | # see rfc2045 for description, but basically, bits 7 and 8 are set to zero;
|
|---|
| 546 | # 4 bytes of encoded text become 3 bytes of binary - remove 2 highest bits
|
|---|
| 547 | # from each byte.
|
|---|
| 548 |
|
|---|
| 549 |
|
|---|
| 550 | sub base64_decode {
|
|---|
| 551 | my $enc_text = shift;
|
|---|
| 552 | # A=>0, B=>1, ..., '+'=>62, '/'=>63
|
|---|
| 553 | # also '=' is used for padding at the end, but we remove it anyway.
|
|---|
| 554 | my $mimechars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
|---|
| 555 | # map each MIME char into it's value, for more efficient lookup.
|
|---|
| 556 | my %index;
|
|---|
| 557 | map { $index{$_} = index ($mimechars, $_) } (split ('', $mimechars));
|
|---|
| 558 | # remove all non-base64 chars. eval to get variable in transliteration...
|
|---|
| 559 | # also remove '=' - we'll assume (!!) that there are no errors in the encoding
|
|---|
| 560 | eval "\$enc_text =~ tr|$mimechars||cd";
|
|---|
| 561 | my $decoded="";
|
|---|
| 562 | while (length ($enc_text)>3)
|
|---|
| 563 | {
|
|---|
| 564 | my $fourchars=substr($enc_text,0,4,"");
|
|---|
| 565 | my @chars=(split '',$fourchars);
|
|---|
| 566 | $decoded.=chr( $index{$chars[0]} << 2 | $index{$chars[1]} >> 4);
|
|---|
| 567 | $decoded.=chr( ($index{$chars[1]} & 15) << 4 | $index{$chars[2]} >> 2);
|
|---|
| 568 | $decoded.=chr( ($index{$chars[2]} & 3 ) << 6 | $index{$chars[3]});
|
|---|
| 569 | }
|
|---|
| 570 | # if there are any input chars left, there are either
|
|---|
| 571 | # 2 encoded bytes (-> 1 raw byte) left or 3 encoded (-> 2 raw) bytes left.
|
|---|
| 572 | my @chars=(split '',$enc_text);
|
|---|
| 573 | if (length($enc_text)) {
|
|---|
| 574 | $decoded.=chr($index{$chars[0]} << 2 | (int $index{$chars[1]} >> 4));
|
|---|
| 575 | }
|
|---|
| 576 | if (length($enc_text)==3) {
|
|---|
| 577 | $decoded.=chr( ($index{$chars[1]} & 15) << 4 | $index{$chars[2]} >> 2);
|
|---|
| 578 | }
|
|---|
| 579 | return $decoded;
|
|---|
| 580 | }
|
|---|
| 581 |
|
|---|
| 582 |
|
|---|
| 583 | # Perl packages have to return true if they are run.
|
|---|
| 584 | 1;
|
|---|
