1 # This module is part of debbugs, and is released
2 # under the terms of the GPL version 2, or any later
3 # version at your option.
4 # See the file README and COPYING for more information.
6 # [Other people have contributed to this file; their copyrights should
8 # Copyright 2006 by Don Armstrong <don@donarmstrong.com>.
11 package Debbugs::MIME;
17 Debbugs::MIME -- Mime handling routines for debbugs
21 use Debbugs::MIME qw(parse decode_rfc1522);
35 use Exporter qw(import);
36 use vars qw($DEBUG $VERSION @EXPORT_OK %EXPORT_TAGS @EXPORT);
40 $DEBUG = 0 unless defined $DEBUG;
44 %EXPORT_TAGS = (mime => [qw(parse create_mime_message getmailbody)],
45 rfc1522 => [qw(decode_rfc1522 encode_rfc1522)],
48 Exporter::export_ok_tags(keys %EXPORT_TAGS);
49 $EXPORT_TAGS{all} = [@EXPORT_OK];
52 use File::Path qw(remove_tree);
53 use File::Temp qw(tempdir);
56 use POSIX qw(strftime);
57 use List::MoreUtils qw(apply);
60 use Debbugs::UTF8 qw(convert_to_utf8);
62 # for decode_rfc1522 and encode_rfc1522
63 use Encode qw(decode encode encode_utf8 decode_utf8 is_utf8);
69 my $type = $entity->effective_type;
70 if ($type eq 'text/plain' or
71 ($type =~ m#text/?# and $type ne 'text/html') or
72 $type eq 'application/pgp') {
74 } elsif ($type eq 'multipart/alternative') {
75 # RFC 2046 says we should use the last part we recognize.
76 for my $part (reverse $entity->parts) {
77 my $ret = getmailbody($part);
81 # For other multipart types, we just pretend they're
82 # multipart/mixed and run through in order.
83 for my $part ($entity->parts) {
84 my $ret = getmailbody($part);
91 =item parse_to_mime_entity
93 $entity = parse_to_mime_entity($record);
95 Returns a MIME::Entity from a record (from Debbugs::Log), a filehandle, or a
96 scalar mail message. Will die upon failure.
98 Intermediate parsing results will be output under a temporary directory which
99 should be cleaned up upon process exit.
103 sub parse_to_mime_entity {
105 my $parser = MIME::Parser->new();
107 # this will be cleaned up once we exit
108 $tempdir = File::Temp->newdir();
109 $parser->output_dir($tempdir->dirname());
110 if (ref($record) eq 'HASH') {
111 if ($record->{inner_file}) {
112 $entity = $parser->parse($record->{fh}) or
113 die "Unable to parse entity";
115 $entity = $parser->parse_data($record->{text}) or
116 die "Unable to parse entity";
118 } elsif (ref($record)) {
119 $entity = $parser->parse($record) or
120 die "Unable to parse entity";
122 $entity = $parser->parse_data($record) or
123 die "Unable to parse entity";
130 # header and decoded body respectively
131 my (@headerlines, @bodylines);
133 my $parser = MIME::Parser->new();
134 my $tempdir = tempdir(CLEANUP => 1);
135 $parser->output_under($tempdir);
136 my $entity = eval { $parser->parse_data($_[0]) };
138 if ($entity and $entity->head->tags) {
139 @headerlines = @{$entity->head->header};
142 my $entity_body = getmailbody($entity);
143 my $entity_body_handle;
145 if (defined $entity_body) {
146 $entity_body_handle = $entity_body->bodyhandle();
147 $charset = $entity_body->head()->mime_attr('content-type.charset');
149 @bodylines = $entity_body_handle ? $entity_body_handle->as_lines() : ();
150 @bodylines = map {convert_to_utf8($_,$charset)} @bodylines;
153 # Legacy pre-MIME code, kept around in case MIME::Parser fails.
154 my @msg = split /\n/, $_[0];
157 # assume us-ascii unless charset is set; probably bad, but we
158 # really shouldn't get to this point anyway
159 my $charset = 'us-ascii';
160 for ($i = 0; $i <= $#msg; ++$i) {
163 while ($msg[$i + 1] =~ /^\s/) {
165 $_ .= "\n" . $msg[$i];
167 if (/charset=\"([^\"]+)\"/) {
170 push @headerlines, $_;
172 @bodylines = map {convert_to_utf8($_,$charset)} @msg[$i .. $#msg];
175 remove_tree($tempdir,{verbose => 0, safe => 1});
177 # Remove blank lines.
178 shift @bodylines while @bodylines and $bodylines[0] !~ /\S/;
180 # Strip off RFC2440-style PGP clearsigning.
181 if (@bodylines and $bodylines[0] =~ /^-----BEGIN PGP SIGNED/) {
182 shift @bodylines while @bodylines and
183 length $bodylines[0] and
184 # we currently don't strip \r; handle this for the
185 # time being, though eventually it should be stripped
186 # too, I think. [See #565981]
187 $bodylines[0] ne "\r";
188 shift @bodylines while @bodylines and $bodylines[0] !~ /\S/;
189 for my $findsig (0 .. $#bodylines) {
190 if ($bodylines[$findsig] =~ /^-----BEGIN PGP SIGNATURE/) {
191 $#bodylines = $findsig - 1;
195 map { s/^- // } @bodylines;
198 return { header => [@headerlines], body => [@bodylines]};
201 =head2 create_mime_message
203 create_mime_message([To=>'don@debian.org'],$body,[$attach1, $attach2],$include_date);
205 Creates a MIME encoded message with headers given by the first
206 argument, and a message given by the second.
208 Optional attachments can be specified in the third arrayref argument.
210 Whether to include the date in the header is the final argument; it
211 defaults to true, setting the Date header if one is not already
214 Headers are passed directly to MIME::Entity::build, the message is the
217 Each of the elements of the attachment arrayref is attached as an
218 rfc822 message if it is a scalar or an arrayref; otherwise if it is a
219 hashref, the contents are passed as an argument to
224 sub create_mime_message{
225 my ($headers,$body,$attachments,$include_date) = @_;
226 $attachments = [] if not defined $attachments;
227 $include_date = 1 if not defined $include_date;
229 die "The first argument to create_mime_message must be an arrayref" unless ref($headers) eq 'ARRAY';
230 die "The third argument to create_mime_message must be an arrayref" unless ref($attachments) eq 'ARRAY';
233 my %headers = apply {defined $_ ? lc($_) : ''} @{$headers};
234 if (not exists $headers{date}) {
237 strftime("%a, %d %b %Y %H:%M:%S +0000",gmtime)
243 # MIME::Entity is stupid, and doesn't rfc1522 encode its headers, so we do it for it.
244 my $msg = MIME::Entity->build('Content-Type' => 'text/plain; charset=utf-8',
245 'Encoding' => 'quoted-printable',
246 (map{encode_rfc1522(encode_utf8(defined $_ ? $_:''))} @{$headers}),
247 Data => encode_utf8($body),
250 # Attach the attachments
251 for my $attachment (@{$attachments}) {
252 if (ref($attachment) eq 'HASH') {
253 $msg->attach(%{$attachment});
256 # This is *craptacular*, but because various MTAs
257 # (sendmail and exim4, at least) appear to eat From
258 # lines in message/rfc822 attachments, we need eat
259 # the entire From line ourselves so the MTA doesn't
260 # leave \n detrius around.
261 if (ref($attachment) eq 'ARRAY' and $attachment->[1] =~ /^From /) {
262 # make a copy so that we don't screw up anything
263 # that is expecting this arrayref to stay constant
264 $attachment = [@{$attachment}];
265 # remove the from line
266 splice @$attachment, 1, 1;
268 elsif (not ref($attachment)) {
269 # It's a scalar; remove the from line
270 $attachment =~ s/^(Received:[^\n]+\n)(From [^\n]+\n)/$1/s;
272 $msg->attach(Type => 'message/rfc822',
278 return $msg->as_string;
284 =head2 decode_rfc1522
286 decode_rfc1522('=?iso-8859-1?Q?D=F6n_Armstr=F3ng?= <don@donarmstrong.com>')
288 Turn RFC-1522 names into the UTF-8 equivalent.
295 # this is craptacular, but leading space is hacked off by unmime.
297 my $leading_space = '';
298 $leading_space = $1 if $string =~ s/^(\ +)//;
299 # we must do this to switch off the utf8 flag before calling decode_mimewords
300 $string = encode_utf8($string);
301 my @mime_words = MIME::Words::decode_mimewords($string);
302 my $tmp = $leading_space .
306 convert_to_utf8(${$_}[0],${$_}[1]);
308 decode_utf8(${$_}[0]);
315 =head2 encode_rfc1522
317 encode_rfc1522('Dön Armströng <don@donarmstrong.com>')
319 Encodes headers according to the RFC1522 standard by calling
320 MIME::Words::encode_mimeword on distinct words as appropriate.
324 # We cannot use MIME::Words::encode_mimewords because that function
325 # does not handle spaces properly at all.
330 # handle being passed undef properly
331 return undef if not defined $rawstr;
333 # convert to octets if we are given a string in perl's internal
335 $rawstr= encode_utf8($rawstr) if is_utf8($rawstr);
336 # We process words in reverse so we can preserve spacing between
337 # encoded words. This regex splits on word|nonword boundaries and
338 # nonword|nonword boundaries. We also consider parenthesis and "
339 # to be nonwords to avoid escaping them in comments in violation
341 my @words = reverse split /(?:(?<=[\s\n\)\(\"])|(?=[\s\n\)\(\"]))/m, $rawstr;
343 my $previous_word_encoded = 0;
345 for my $word (@words) {
346 if ($word !~ m#[\x00-\x1F\x7F-\xFF]#o and $word ne ' ') {
347 $string = $word.$string;
348 $previous_word_encoded=0;
350 elsif ($word =~ /^[\s\n]$/) {
351 $string = $word.$string;
352 $previous_word_encoded = 0 if $word eq "\n";
355 my $encoded = MIME::Words::encode_mimeword($word, 'q', 'UTF-8');
356 # RFC 1522 mandates that segments be at most 76 characters
357 # long. If that's the case, we split the word up into 10
358 # character pieces and encode it. We must use the Encode
359 # magic here to avoid breaking on bit boundaries here.
360 if (length $encoded > 75) {
361 # Turn utf8 into the internal perl representation
362 # so . is a character, not a byte.
363 my $tempstr = is_utf8($word)?$word:decode_utf8($word,Encode::FB_DEFAULT);
365 # Strip it into 10 character long segments, and encode
367 # XXX It's possible that these segments are > 76 characters
368 while ($tempstr =~ s/(.{1,10})$//) {
369 # turn the character back into the utf8 representation.
370 my $tempword = encode_utf8($1);
371 # It may actually be better to eventually use
372 # the base64 encoding here, but I'm not sure
373 # if that's as widely supported as quoted
375 unshift @encoded, MIME::Words::encode_mimeword($tempword,'q','UTF-8');
377 $encoded = join(" ",@encoded);
378 # If the previous word was encoded, we must
379 # include a trailing _ that gets encoded as a
381 $encoded =~ s/\?\=$/_\?\=/ if $previous_word_encoded;
382 $string = $encoded.$string;
385 # If the previous word was encoded, we must
386 # include a trailing _ that gets encoded as a
388 $encoded =~ s/\?\=$/_\?\=/ if $previous_word_encoded;
389 $string = $encoded.$string;
391 $previous_word_encoded = 1;