1#!@PERL@
2# @configure_input@
3# @file
4# @brief Extract HTML from an RFC-822 email
5#
6# Copyright (C) 2010,2015,2018 Olly Betts
7#
8# Permission is hereby granted, free of charge, to any person obtaining a copy
9# of this software and associated documentation files (the "Software"), to
10# deal in the Software without restriction, including without limitation the
11# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
12# sell copies of the Software, and to permit persons to whom the Software is
13# furnished to do so, subject to the following conditions:
14#
15# The above copyright notice and this permission notice shall be included in
16# all copies or substantial portions of the Software.
17#
18# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24# IN THE SOFTWARE.
25
26use strict;
27eval {
28    require MIME::Parser;
29    require MIME::WordDecoder;
30    require HTML::Entities;
31    # In core since Perl 5.9.5:
32    require Time::Piece;
33};
34if ($@) {
35    print STDERR $@;
36    # Exit with code 127 which omindex interprets as "filter not installed"
37    # and won't try further .msg files.
38    exit 127;
39}
40
41my $in = shift @ARGV;
42my $parser = new MIME::Parser;
43# Keep data in memory rather than spraying files onto disk.
44$parser->output_to_core(1);
45$parser->tmp_to_core(1);
46open IN, '<', $in or die "Couldn't open '$in' ($?)\n";
47my $ent = $parser->parse(\*IN) or die "Failed to parse '$in' as MIME message\n";
48
49my $head = $ent->head;
50print "<head>\n<title>";
51print do_header($head, 'Subject');
52print "</title>\n<meta name=\"author\" content=\"";
53print do_header($head, 'From');
54print "\">\n";
55
56my $date = do_header($head, 'Date');
57chomp $date;
58eval {
59    eval {
60	$date = Time::Piece->strptime($date, '%a, %d %b %Y %T %z');
61    };
62    # The "%a, " part is optional in RFC822 and RFC2822.
63    $date = Time::Piece->strptime($date, '%d %b %Y %T %z') if $@;
64    my $iso8601_date = $date->datetime;
65    print "<meta name=\"created\" content=\"$iso8601_date\">\n";
66};
67
68print "</head>\n";
69
70handle_mimepart($ent);
71
72sub do_header {
73    my ($head, $header) = @_;
74    my $s = MIME::WordDecoder::mime_to_perl_string($head->get($header, 0));
75    chomp($s);
76    return HTML::Entities::encode_entities($s);
77}
78
79sub handle_mimepart {
80    my $e = shift;
81    my ($type, $sub) = ((lc $e->mime_type) =~ m,^(.*?)/(.*?)(?:;.*)?$,);
82    if ($type eq 'multipart') {
83	if ($sub eq 'alternative') {
84	    # Take the first mime part which we get text from.
85	    for my $s ($e->parts) {
86		my $res = handle_mimepart($s);
87		return $res if $res;
88	    }
89	} else {
90	    my $res = 0;
91	    for my $s ($e->parts) {
92		$res += handle_mimepart($s);
93	    }
94	    return $res;
95	}
96    } elsif ($type eq 'text') {
97	if ($sub eq 'plain') {
98	    my $m = $e->bodyhandle->as_string;
99	    print "<pre>", HTML::Entities::encode_entities($m), "</pre>\n";
100	    return 1;
101	} elsif ($sub eq 'html') {
102	    my $m = $e->bodyhandle->as_string;
103	    $m =~ s!</?body[^>]*>!\n!gi;
104	    print $m, "\n";
105	    return 1;
106	}
107    }
108    return 0;
109}
110