1 | ###########################################################################
|
---|
2 | #
|
---|
3 | # EMAILPlug.pm - a plugin for parsing email files
|
---|
4 | #
|
---|
5 | # A component of the Greenstone digital library software
|
---|
6 | # from the New Zealand Digital Library Project at the
|
---|
7 | # University of Waikato, New Zealand.
|
---|
8 | #
|
---|
9 | # Copyright (C) 1999-2002 New Zealand Digital Library Project
|
---|
10 | #
|
---|
11 | # This program is free software; you can redistribute it and/or modify
|
---|
12 | # it under the terms of the GNU General Public License as published by
|
---|
13 | # the Free Software Foundation; either version 2 of the License, or
|
---|
14 | # (at your option) any later version.
|
---|
15 | #
|
---|
16 | # This program is distributed in the hope that it will be useful,
|
---|
17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
---|
19 | # GNU General Public License for more details.
|
---|
20 | #
|
---|
21 | # You should have received a copy of the GNU General Public License
|
---|
22 | # along with this program; if not, write to the Free Software
|
---|
23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
---|
24 | #
|
---|
25 | ###########################################################################
|
---|
26 |
|
---|
27 |
|
---|
28 |
|
---|
29 | # EMAILPlug
|
---|
30 | #
|
---|
31 | # by Gordon Paynter ([email protected])
|
---|
32 | #
|
---|
33 | # Email plug reads email files. These are named with a simple
|
---|
34 | # number (i.e. as they appear in maildir folders) or with the
|
---|
35 | # extension .mbx (for mbox mail file format)
|
---|
36 | #
|
---|
37 | # Document text:
|
---|
38 | # The document text consists of all the text
|
---|
39 | # after the first blank line in the document.
|
---|
40 | #
|
---|
41 | # Metadata (not Dublin Core!):
|
---|
42 | # $Headers All the header content (optional, not stored by default)
|
---|
43 | # $Subject Subject: header
|
---|
44 | # $To To: header
|
---|
45 | # $From From: header
|
---|
46 | # $FromName Name of sender (where available)
|
---|
47 | # $FromAddr E-mail address of sender
|
---|
48 | # $DateText Date: header
|
---|
49 | # $Date Date: header in GSDL format (eg: 19990924)
|
---|
50 | #
|
---|
51 | # $Title made up of Subject, Date and Sender (for default formatting)
|
---|
52 | #
|
---|
53 | #
|
---|
54 | # John McPherson - June/July 2001
|
---|
55 | # added (basic) MIME support and quoted-printable and base64 decodings.
|
---|
56 | # Minor fixes for names that are actually email addresses (ie <...> was lost)
|
---|
57 | #
|
---|
58 | # See: * RFC 822 - ARPA Internet Text Messages
|
---|
59 | # * RFC 2045 - Multipurpose Internet Mail Extensions (MIME) -part1
|
---|
60 | # * RFC 2046 - MIME (part 2) Media Types (and multipart messages)
|
---|
61 | # * RFC 2047 - MIME (part 3) Message Header Extensions
|
---|
62 | # * RFC 1806 - Content Dispositions (ie inline/attachment)
|
---|
63 |
|
---|
64 | # 12/05/02 Added usage datastructure - John Thompson
|
---|
65 | package EMAILPlug;
|
---|
66 |
|
---|
67 | use strict;
|
---|
68 | no strict "refs"; # so we can use a variable as a filehandle for print $out
|
---|
69 |
|
---|
70 |
|
---|
71 | use SplitPlug;
|
---|
72 | use unicode; # gs conv functions
|
---|
73 | use gsprintf 'gsprintf'; # translations
|
---|
74 |
|
---|
75 | use sorttools;
|
---|
76 | use util;
|
---|
77 |
|
---|
78 | sub BEGIN {
|
---|
79 | @EMAILPlug::ISA = ('SplitPlug');
|
---|
80 | }
|
---|
81 |
|
---|
82 |
|
---|
83 | my $arguments =
|
---|
84 | [ { 'name' => "process_exp",
|
---|
85 | 'desc' => "{BasPlug.process_exp}",
|
---|
86 | 'type' => "regexp",
|
---|
87 | 'reqd' => "no",
|
---|
88 | 'deft' => &get_default_process_exp() },
|
---|
89 | { 'name' => "no_attachments",
|
---|
90 | 'desc' => "{EMAILPlug.no_attachments}",
|
---|
91 | 'type' => "flag",
|
---|
92 | 'reqd' => "no" },
|
---|
93 | { 'name' => "headers",
|
---|
94 | 'desc' => "{EMAILPlug.headers}",
|
---|
95 | 'type' => "flag",
|
---|
96 | 'reqd' => "no" },
|
---|
97 | { 'name' => "split_exp",
|
---|
98 | 'desc' => "{EMAILPlug.split_exp}",
|
---|
99 | 'type' => "regexp",
|
---|
100 | 'reqd' => "no",
|
---|
101 | 'deft' => &get_default_split_exp() }
|
---|
102 | ];
|
---|
103 |
|
---|
104 | my $options = { 'name' => "EMAILPlug",
|
---|
105 | 'desc' => "{EMAILPlug.desc}",
|
---|
106 | 'abstract' => "no",
|
---|
107 | 'inherits' => "yes",
|
---|
108 | 'args' => $arguments };
|
---|
109 |
|
---|
110 | # Create a new EMAILPlug object with which to parse a file.
|
---|
111 | # Accomplished by creating a new BasPlug and using bless to
|
---|
112 | # turn it into an EMAILPlug.
|
---|
113 |
|
---|
114 | sub new {
|
---|
115 | my ($class) = shift (@_);
|
---|
116 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
|
---|
117 | push(@$pluginlist, $class);
|
---|
118 |
|
---|
119 | if(defined $arguments){ push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});}
|
---|
120 | if(defined $options) { push(@{$hashArgOptLists->{"OptList"}},$options)};
|
---|
121 |
|
---|
122 | my $self = (defined $hashArgOptLists)? new SplitPlug($pluginlist,$inputargs,$hashArgOptLists): new SplitPlug($pluginlist,$inputargs);
|
---|
123 |
|
---|
124 | $self->{'assoc_filenames'} = {}; # to save attach names so we don't clobber
|
---|
125 |
|
---|
126 | # this might not actually be true at read-time, but after processing
|
---|
127 | # it should all be utf8.
|
---|
128 | $self->{'input_encoding'}="utf8";
|
---|
129 | return bless $self, $class;
|
---|
130 | }
|
---|
131 |
|
---|
132 | sub get_default_process_exp {
|
---|
133 | my $self = shift (@_);
|
---|
134 | # mbx/email for mailbox file format, \d+ for maildir (each message is
|
---|
135 | # in a separate file, with a unique number for filename)
|
---|
136 | # mozilla and IE will save individual mbx format files with a ".eml" ext.
|
---|
137 | return q@([\\/]\d+|\.(mbx|email|eml))$@;
|
---|
138 | }
|
---|
139 |
|
---|
140 | # This plugin splits the mbox mail files at lines starting with From<sp>
|
---|
141 | # It is supposed to be "\n\nFrom ", but this isn't always used.
|
---|
142 | # add \d{4} so that the line ends in a year (in case the text has an
|
---|
143 | # unescaped "From " at the start of a line).
|
---|
144 | sub get_default_split_exp {
|
---|
145 | return q^\nFrom .*\d{4}\n^;
|
---|
146 |
|
---|
147 | }
|
---|
148 |
|
---|
149 |
|
---|
150 | # do plugin specific processing of doc_obj
|
---|
151 | sub process {
|
---|
152 |
|
---|
153 | my $self = shift (@_);
|
---|
154 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
|
---|
155 | my $outhandle = $self->{'outhandle'};
|
---|
156 |
|
---|
157 | # Check that we're dealing with a valid mail file
|
---|
158 | # mbox message files start with "From "
|
---|
159 | # maildir messages usually start with Return-Path and Delivered-To
|
---|
160 | # mh is very similar to maildir
|
---|
161 | my $startoffile=substr($$textref,0,256);
|
---|
162 | if (($startoffile !~ /^(From )/) &&
|
---|
163 | ($startoffile !~ /^(From|To|Envelope.*|Received|Return-Path|Date|Subject|Content\-.*|MIME-Version|Forwarded):/im)) {
|
---|
164 | return undef;
|
---|
165 | }
|
---|
166 |
|
---|
167 |
|
---|
168 | print STDERR "<Processing n='$file' p='EMAILPlug'>\n" if ($gli);
|
---|
169 |
|
---|
170 | gsprintf($outhandle, "EMAILPlug: {common.processing} $file\n")
|
---|
171 | if $self->{'verbosity'} > 1;
|
---|
172 |
|
---|
173 | my $cursection = $doc_obj->get_top_section();
|
---|
174 |
|
---|
175 | #
|
---|
176 | # Parse the document's text and extract metadata
|
---|
177 | #
|
---|
178 |
|
---|
179 | # Protect backslashes
|
---|
180 | $$textref =~ s@\\@\\\\@g;
|
---|
181 |
|
---|
182 | # Separate header from body of message
|
---|
183 | my $Headers = $$textref;
|
---|
184 | $Headers =~ s/\r?\n\r?\n(.*)$//s;
|
---|
185 | $$textref = $1;
|
---|
186 | $Headers .= "\n";
|
---|
187 |
|
---|
188 | # Unfold headers - see rfc822
|
---|
189 | $Headers =~ s/\r?\n[\t\ ]+/ /gs;
|
---|
190 | # Extract basic metadata from header
|
---|
191 | my @headers = ("From", "To", "Subject", "Date");
|
---|
192 | my %raw;
|
---|
193 | foreach my $name (@headers) {
|
---|
194 | $raw{$name} = "No $name value";
|
---|
195 | }
|
---|
196 |
|
---|
197 | # Get a default encoding for the header - RFC says should be ascii...
|
---|
198 | my $default_header_encoding="iso_8859_1";
|
---|
199 |
|
---|
200 | # We don't know what character set is the user's default...
|
---|
201 | # We could use textcat to guess... for now we'll look at mime content-type
|
---|
202 | # if ($Headers =~ /([[:^ascii:]])/) {
|
---|
203 | # }
|
---|
204 | if ($Headers =~ /^Content\-type:.*charset=\"?([a-z0-9\-_]+)/mi) {
|
---|
205 | $default_header_encoding=$1;
|
---|
206 | $default_header_encoding =~ s@\-@_@g;
|
---|
207 | $default_header_encoding =~ tr/A-Z/a-z/;
|
---|
208 | }
|
---|
209 |
|
---|
210 |
|
---|
211 | # Examine each line of the headers
|
---|
212 | my ($line, $name, $value);
|
---|
213 | my @parts;
|
---|
214 | foreach $line (split(/\n/, $Headers)) {
|
---|
215 |
|
---|
216 | # Ignore lines with no content or which begin with whitespace
|
---|
217 | next unless ($line =~ /:/);
|
---|
218 | next if ($line =~ /^\s/);
|
---|
219 |
|
---|
220 | # Find out what metadata is on this line
|
---|
221 | @parts = split(/:/, $line);
|
---|
222 | $name = shift @parts;
|
---|
223 | # get fieldname in canonical form - first cap, then lower case.
|
---|
224 | $name =~ tr/A-Z/a-z/;
|
---|
225 | # uppercase the first character according to the current locale
|
---|
226 | $name=~s/(.+)/\u$1/;
|
---|
227 | next unless $name;
|
---|
228 | next unless ($raw{$name});
|
---|
229 |
|
---|
230 | # Find the value of that metadata
|
---|
231 | $value = join(":", @parts);
|
---|
232 | $value =~ s/^\s+//;
|
---|
233 | $value =~ s/\s+$//;
|
---|
234 | # decode headers if stored using =?<charset>?[BQ]?<data>?= (rfc2047)
|
---|
235 | if ($value =~ /=\?.*\?[BbQq]\?.*\?=/) {
|
---|
236 | my $original_value=$value;
|
---|
237 | my $encoded=$value;
|
---|
238 | $value="";
|
---|
239 | # we should ignore spaces between consecutive encoded-texts
|
---|
240 | $encoded =~ s@\?=\s+=\?@\?==\?@g;
|
---|
241 | while ($encoded =~ s/(.*?)=\?([^\?]*)\?([bq])\?([^\?]+)\?=//i) {
|
---|
242 | my ($charset, $encoding, $data)=($2,$3,$4);
|
---|
243 | my ($decoded_data);
|
---|
244 | $value.="$1"; # any leading chars
|
---|
245 | $data=~s/^\s*//; $data=~s/\s*$//; # strip whitespace from ends
|
---|
246 | chomp $data;
|
---|
247 | $encoding =~ tr/BQ/bq/;
|
---|
248 | if ($encoding eq "q") { # quoted printable
|
---|
249 | $data =~ s/_/\ /g; # from rfc2047 (sec 4.2.2)
|
---|
250 | $decoded_data=qp_decode($data);
|
---|
251 | # qp_decode adds \n, which is default for body text
|
---|
252 | chomp($decoded_data);
|
---|
253 | } else { # base 64
|
---|
254 | $decoded_data=base64_decode($data);
|
---|
255 | }
|
---|
256 | $self->convert2unicode($charset, \$decoded_data);
|
---|
257 | $value .= $decoded_data;
|
---|
258 | } # end of while loop
|
---|
259 |
|
---|
260 | # get any trailing characters
|
---|
261 | $self->convert2unicode($default_header_encoding, \$encoded);
|
---|
262 | $value.=$encoded;
|
---|
263 |
|
---|
264 | if ($value =~ /^\s*$/) { # we couldn't extract anything...
|
---|
265 | $self->convert2unicode($default_header_encoding,
|
---|
266 | \$original_value);
|
---|
267 | $value=$original_value;
|
---|
268 | }
|
---|
269 | } # end of if =?...?=
|
---|
270 |
|
---|
271 | # In the absense of other charset information, assume the
|
---|
272 | # header is the default (usually "iso_8859_1") and convert to unicode.
|
---|
273 | else {
|
---|
274 | $self->convert2unicode($default_header_encoding, \$value);
|
---|
275 | }
|
---|
276 |
|
---|
277 | # Store the metadata
|
---|
278 | $value =~ s@_@\\_@g; # protect against GS macro language
|
---|
279 | $raw{$name} = $value;
|
---|
280 | }
|
---|
281 |
|
---|
282 | # Extract the name and e-mail address from the From metadata
|
---|
283 | my $frommeta = $raw{"From"};
|
---|
284 | my $fromnamemeta;
|
---|
285 | my $fromaddrmeta;
|
---|
286 |
|
---|
287 | $frommeta =~ s/\s*$//; # Remove trailing space, if any
|
---|
288 |
|
---|
289 | if ($frommeta =~ m/(.+)\s*<(.+)>/) {
|
---|
290 | $fromnamemeta=$1;
|
---|
291 | $fromaddrmeta=$2;
|
---|
292 | } elsif ($frommeta =~ m/(.+@.+)\s+\((.*)\)/) {
|
---|
293 | $fromnamemeta=$2;
|
---|
294 | $fromaddrmeta=$1;
|
---|
295 | }
|
---|
296 | if (!defined($fromaddrmeta)) {
|
---|
297 | $fromaddrmeta=$frommeta;
|
---|
298 | }
|
---|
299 | $fromaddrmeta=~s/<//; $fromaddrmeta=~s/>//;
|
---|
300 | # minor attempt to prevent spam-bots from harvesting addresses...
|
---|
301 | $fromaddrmeta=~s/@/@/;
|
---|
302 |
|
---|
303 | $doc_obj->add_utf8_metadata ($cursection, "FromAddr", $fromaddrmeta);
|
---|
304 |
|
---|
305 | if (defined($fromnamemeta) && $fromnamemeta) { # must be > 0 long
|
---|
306 | $fromnamemeta =~ s/\"//g; # remove quotes
|
---|
307 | $fromnamemeta =~ s/\s+$//; # remove trailing whitespace
|
---|
308 | }
|
---|
309 | else {
|
---|
310 | $fromnamemeta = $fromaddrmeta;
|
---|
311 | }
|
---|
312 | # if name is an address
|
---|
313 | $fromnamemeta =~ s/<//g; $fromnamemeta =~ s/>//g;
|
---|
314 | $fromnamemeta=~s/@/@\;/;
|
---|
315 | $doc_obj->add_utf8_metadata ($cursection, "FromName", $fromnamemeta);
|
---|
316 |
|
---|
317 | $raw{"From"}=$frommeta;
|
---|
318 |
|
---|
319 | # Process Date information
|
---|
320 | if ($raw{"Date"} !~ /No Date/) {
|
---|
321 | $raw{"DateText"} = $raw{"Date"};
|
---|
322 |
|
---|
323 | # Convert the date text to internal date format
|
---|
324 | $value = $raw{"Date"};
|
---|
325 | my ($day, $month, $year) = $value =~ /(\d?\d)\s([A-Z][a-z][a-z])\s(\d\d\d?\d?)/;
|
---|
326 | # make some assumptions about the year formatting...
|
---|
327 | # some (old) software thinks 2001 is 101, some think 2001 is 01
|
---|
328 | if ($year < 20) { $year += 2000; } # assume not really 1920...
|
---|
329 | elsif ($year < 150) { $year += 1900; } # assume not really 2150...
|
---|
330 | $raw{"Date"} = &sorttools::format_date($day, $month, $year);
|
---|
331 |
|
---|
332 | } else {
|
---|
333 | # We have not extracted a date
|
---|
334 | $raw{"DateText"} = "Unknown.";
|
---|
335 | $raw{"Date"} = "19000000";
|
---|
336 | }
|
---|
337 |
|
---|
338 | # Add extracted metadata to document object
|
---|
339 | foreach my $name (keys %raw) {
|
---|
340 | $value = $raw{$name};
|
---|
341 | if ($value) {
|
---|
342 | # assume subject, etc headers have no special HTML meaning.
|
---|
343 | $value = &text_into_html($value);
|
---|
344 | # escape [] so it isn't re-interpreted as metadata
|
---|
345 | $value =~ s/\[/[/g; $value =~ s/\]/]/g;
|
---|
346 | } else {
|
---|
347 | $value = "No $name field";
|
---|
348 | }
|
---|
349 | $doc_obj->add_utf8_metadata ($cursection, $name, $value);
|
---|
350 | }
|
---|
351 |
|
---|
352 |
|
---|
353 | # extract a message ID from the headers, if there is one, and we'll use
|
---|
354 | # that as the greenstone doc ID. Having a predictable ID means we can
|
---|
355 | # link to other messages, eg from In-Reply-To or References headers...
|
---|
356 | if ($Headers =~ m@^Message-ID:(.+)$@mi) {
|
---|
357 | my $id=escape_msg_id($1);
|
---|
358 | $doc_obj->{'msgid'}=$id;
|
---|
359 | }
|
---|
360 | # link to another message, if this is a reply
|
---|
361 | if ($Headers =~ m@^In-Reply-To:(.+)$@mi) {
|
---|
362 | my $id=escape_msg_id($1);
|
---|
363 | $doc_obj->add_utf8_metadata ($cursection, 'InReplyTo', $id);
|
---|
364 | } elsif ($Headers =~ m@^References:.*\s([^\s]+)$@mi) {
|
---|
365 | # References can have multiple, get the last one
|
---|
366 | my $id=escape_msg_id($1);
|
---|
367 | # not necessarily in-reply-to, but same thread...
|
---|
368 | $doc_obj->add_utf8_metadata ($cursection, 'InReplyTo', $id);
|
---|
369 | }
|
---|
370 |
|
---|
371 |
|
---|
372 |
|
---|
373 | my $mimetype="text/plain";
|
---|
374 | my $mimeinfo="";
|
---|
375 | my $charset = $default_header_encoding;
|
---|
376 | # Do MIME and encoding stuff. Allow \s in mimeinfo in case there is
|
---|
377 | # more than one parameter given to Content-type.
|
---|
378 | # eg: Content-type: text/plain; charset="us-ascii"; format="flowed"
|
---|
379 | if ($Headers =~ m@^content\-type:\s*([\w\.\-/]+)\s*(\;\s*.+)?\s*$@mi)
|
---|
380 | {
|
---|
381 | $mimetype=$1;
|
---|
382 | $mimetype =~ tr/[A-Z]/[a-z]/;
|
---|
383 |
|
---|
384 | if ($mimetype eq "text") { # for pre-RFC2045 messages (c. 1996)
|
---|
385 | $mimetype = "text/plain";
|
---|
386 | }
|
---|
387 |
|
---|
388 | $mimeinfo=$2;
|
---|
389 | if (!defined $mimeinfo) {
|
---|
390 | $mimeinfo="";
|
---|
391 | } else { # strip leading and trailing stuff
|
---|
392 | $mimeinfo =~ s/^\;\s*//;
|
---|
393 | $mimeinfo =~ s/\s*$//;
|
---|
394 | }
|
---|
395 | if ($mimeinfo =~ /charset=\"([^\"]+)\"/i) {
|
---|
396 | $charset = $1;
|
---|
397 | }
|
---|
398 | }
|
---|
399 |
|
---|
400 | my $transfer_encoding="7bit";
|
---|
401 | if ($Headers =~ /^content-transfer-encoding:\s*([^\s]+)\s*$/mi) {
|
---|
402 | $transfer_encoding=$1;
|
---|
403 | }
|
---|
404 |
|
---|
405 | if ($mimetype eq "text/html") {
|
---|
406 | $$textref= $self->text_from_part($$textref, $Headers);
|
---|
407 | } elsif ($mimetype ne "text/plain") {
|
---|
408 | $self->{'doc_obj'} = $doc_obj; # in case we need to associate files...
|
---|
409 | $$textref=$self->text_from_mime_message($mimetype,$mimeinfo,$$textref);
|
---|
410 | } else { # mimetype eq text/plain
|
---|
411 |
|
---|
412 | if ($transfer_encoding =~ /quoted\-printable/) {
|
---|
413 | $$textref=qp_decode($$textref);
|
---|
414 | } elsif ($transfer_encoding =~ /base64/) {
|
---|
415 | $$textref=base64_decode($$textref);
|
---|
416 | }
|
---|
417 | $self->convert2unicode($charset, $textref);
|
---|
418 |
|
---|
419 | $$textref = &text_into_html($$textref);
|
---|
420 | $$textref =~ s@_@\\_@g; # protect against GS macro language
|
---|
421 |
|
---|
422 | }
|
---|
423 |
|
---|
424 |
|
---|
425 | if ($self->{'headers'} && $self->{'headers'} == 1) {
|
---|
426 | # Add "All headers" metadata
|
---|
427 | $Headers = &text_into_html($Headers);
|
---|
428 |
|
---|
429 | $Headers = "No headers" unless ($Headers =~ /\w/);
|
---|
430 | $Headers =~ s/@/@\;/g;
|
---|
431 | # escape [] so it isn't re-interpreted as metadata
|
---|
432 | $Headers =~ s/\[/[/g; $Headers =~ s/\]/]/g;
|
---|
433 | $self->convert2unicode($charset, \$Headers);
|
---|
434 |
|
---|
435 | $Headers =~ s@_@\\_@g; # protect against GS macro language
|
---|
436 | $doc_obj->add_utf8_metadata ($cursection, "Headers", $Headers);
|
---|
437 | }
|
---|
438 |
|
---|
439 |
|
---|
440 | # Add Title metadata
|
---|
441 | my $Title = text_into_html($raw{'Subject'});
|
---|
442 | $Title .= "<br>From: " . text_into_html($fromnamemeta);
|
---|
443 | $Title .= "<br>Date: " . text_into_html($raw{'DateText'});
|
---|
444 | $Title =~ s/\[/[/g; $Title =~ s/\]/]/g;
|
---|
445 |
|
---|
446 | $doc_obj->add_utf8_metadata ($cursection, "Title", $Title);
|
---|
447 |
|
---|
448 | # Add FileFormat metadata
|
---|
449 | $doc_obj->add_metadata($cursection, "FileFormat", "EMAIL");
|
---|
450 |
|
---|
451 | # Add text to document object
|
---|
452 | $$textref = "No message" unless ($$textref =~ /\w/);
|
---|
453 |
|
---|
454 | $doc_obj->add_utf8_text($cursection, $$textref);
|
---|
455 |
|
---|
456 | return 1;
|
---|
457 | }
|
---|
458 |
|
---|
459 |
|
---|
460 | # Convert a text string into HTML.
|
---|
461 | #
|
---|
462 | # The HTML is going to be inserted into a GML file, so
|
---|
463 | # we have to be careful not to use symbols like ">",
|
---|
464 | # which ocurs frequently in email messages (and use
|
---|
465 | # > instead.
|
---|
466 | #
|
---|
467 | # This function also turns links and email addresses into hyperlinks,
|
---|
468 | # and replaces carriage returns with <BR> tags (and multiple carriage
|
---|
469 | # returns with <P> tags).
|
---|
470 |
|
---|
471 |
|
---|
472 | sub text_into_html {
|
---|
473 | my ($text) = @_;
|
---|
474 |
|
---|
475 | # Convert problem characters into HTML symbols
|
---|
476 | $text =~ s/&/&/g;
|
---|
477 | $text =~ s/</</g;
|
---|
478 | $text =~ s/>/>/g;
|
---|
479 | $text =~ s/\"/"/g;
|
---|
480 |
|
---|
481 | # convert email addresses and URIs into links
|
---|
482 | # don't markup email addresses for now
|
---|
483 | # $text =~ s/([\w\d\.\-]+@[\w\d\.\-]+)/<a href=\"mailto:$1\">$1<\/a>/g;
|
---|
484 |
|
---|
485 | # try to munge email addresses a little bit...
|
---|
486 | $text =~ s/@/@/;
|
---|
487 | # assume hostnames are \.\w\- only, then might have a trailing '/.*'
|
---|
488 | # assume URI doesn't finish with a '.'
|
---|
489 | $text =~ s@((http|ftp|https)://[\w\-]+(\.[\w\-]+)*/?((&|\.)?[\w\?\=\-_/~]+)*(\#[\w\.\-_]*)?)@<a href=\"$1\">$1<\/a>@g;
|
---|
490 |
|
---|
491 |
|
---|
492 | # Clean up whitespace and convert \n charaters to <BR> or <P>
|
---|
493 | $text =~ s/ +/ /g;
|
---|
494 | $text =~ s/\s*$//g;
|
---|
495 | $text =~ s/^\s*//g;
|
---|
496 | $text =~ s/\n/\n<br>/g;
|
---|
497 | $text =~ s/<br>\s*<br>/<p>/gi;
|
---|
498 |
|
---|
499 | return $text;
|
---|
500 | }
|
---|
501 |
|
---|
502 |
|
---|
503 |
|
---|
504 |
|
---|
505 | #Process a MIME message.
|
---|
506 | # the textref we are given DOES NOT include the header.
|
---|
507 | sub text_from_mime_message {
|
---|
508 | my $self = shift(@_);
|
---|
509 | my ($mimetype,$mimeinfo,$text)=(@_);
|
---|
510 | my $outhandle=$self->{'outhandle'};
|
---|
511 | # Check for multiparts - $mimeinfo will be a boundary
|
---|
512 | if ($mimetype =~ /multipart/) {
|
---|
513 | my $boundary="";
|
---|
514 | if ($mimeinfo =~ m@boundary=(\"[^\"]+\"|[^\s]+)\s*$@im) {
|
---|
515 | $boundary=$1;
|
---|
516 | if ($boundary =~ m@^\"@) {
|
---|
517 | $boundary =~ s@^\"@@; $boundary =~ s@\"$@@;
|
---|
518 | }
|
---|
519 | } else {
|
---|
520 | print $outhandle "EMAILPlug: (warning) couldn't parse MIME boundary\n";
|
---|
521 | }
|
---|
522 | # parts start with "--$boundary"
|
---|
523 | # message ends with "--$boundary--"
|
---|
524 | # RFC says boundary is <70 chars, [A-Za-z'()+_,-./:=?], so escape any
|
---|
525 | # that perl might want to interpolate. Also allows spaces...
|
---|
526 | $boundary=~s/\\/\\\\/g;
|
---|
527 | $boundary=~s/([\?\+\.\(\)\:\/\'])/\\$1/g;
|
---|
528 | my @message_parts = split("\r?\n\-\-$boundary", "\n$text");
|
---|
529 | # remove first "part" and last "part" (final --)
|
---|
530 | shift @message_parts;
|
---|
531 | my $last=pop @message_parts;
|
---|
532 | # if our boundaries are a bit dodgy and we only found 1 part...
|
---|
533 | if (!defined($last)) {$last="";}
|
---|
534 | # make sure it is only -- and whitespace
|
---|
535 | if ($last !~ /^\-\-\s*$/ms) {
|
---|
536 | print $outhandle "EMAILPlug: (warning) last part of MIME message isn't empty\n";
|
---|
537 | }
|
---|
538 | foreach my $message_part (@message_parts) {
|
---|
539 | # remove the leading newline left from split.
|
---|
540 | $message_part=~s/^\r?\n//;
|
---|
541 | }
|
---|
542 | if ($mimetype eq "multipart/alternative") {
|
---|
543 | # check for an HTML version first, then TEXT, otherwise use first.
|
---|
544 | my $part_text="";
|
---|
545 | foreach my $message_part (@message_parts) {
|
---|
546 | if ($message_part =~ m@\s*content\-type:\s*text/html@mis)
|
---|
547 | {
|
---|
548 | # Use the HTML version
|
---|
549 | $part_text= $self->text_from_part($message_part);
|
---|
550 | $mimetype="text/html";
|
---|
551 | last;
|
---|
552 | }
|
---|
553 | }
|
---|
554 | if ($part_text eq "") { # try getting a text part instead
|
---|
555 | foreach my $message_part (@message_parts) {
|
---|
556 | if ($message_part =~ m@^content\-type:\s*text/plain@mis)
|
---|
557 | {
|
---|
558 | # Use the plain version
|
---|
559 | $part_text= $self->text_from_part($message_part);
|
---|
560 | if ($part_text =~/[^\s]/) {
|
---|
561 | $part_text = text_into_html($part_text);
|
---|
562 | }
|
---|
563 | $mimetype="text/plain";
|
---|
564 | last;
|
---|
565 | }
|
---|
566 | }
|
---|
567 | }
|
---|
568 | if ($part_text eq "") { #use first part (no html/text part found)
|
---|
569 | $part_text = $self->text_from_part(shift @message_parts);
|
---|
570 | $part_text = text_into_html($part_text);
|
---|
571 | }
|
---|
572 | if ($part_text eq "") { # we couldn't get anything!!!
|
---|
573 | # or it was an empty message...
|
---|
574 | # do nothing...
|
---|
575 | gsprintf($outhandle, "{BasPlug.empty_file} - empty body?\n");
|
---|
576 | } else {
|
---|
577 | $text = $part_text;
|
---|
578 | }
|
---|
579 | } elsif ($mimetype =~ m@multipart/(mixed|digest|related|signed)@) {
|
---|
580 | $text = "";
|
---|
581 | # signed is for PGP/GPG messages... the last part is a hash
|
---|
582 | if ($mimetype =~ m@multipart/signed@) {
|
---|
583 | pop @message_parts;
|
---|
584 | }
|
---|
585 | my $is_first_part=1;
|
---|
586 | foreach my $message_part (@message_parts) {
|
---|
587 | if ($is_first_part && $text ne "") {$is_first_part=0;}
|
---|
588 |
|
---|
589 | if ($mimetype eq "multipart/digest") {
|
---|
590 | # default type - RTFRFC!! Set if not already set
|
---|
591 | $message_part =~ m@^(.*)\n\r?\n@s;
|
---|
592 | my $part_header=$1;
|
---|
593 | if ($part_header !~ m@^content-type@mi) {
|
---|
594 | $message_part="Content-type: message/rfc822\n"
|
---|
595 | . $message_part; # prepend default type
|
---|
596 | }
|
---|
597 | }
|
---|
598 |
|
---|
599 | $text .= $self->process_multipart_part($message_part,
|
---|
600 | $is_first_part);
|
---|
601 | } # foreach message part.
|
---|
602 | } else {
|
---|
603 | # we can't handle this multipart type (not mixed or alternative)
|
---|
604 | # the RFC also mentions "parallel".
|
---|
605 | }
|
---|
606 | } # end of ($mimetype =~ multipart)
|
---|
607 | elsif ($mimetype =~ m@message/rfc822@) {
|
---|
608 | my $msg_header = $text;
|
---|
609 | $msg_header =~ s/\r?\n\r?\n(.*)$//s;
|
---|
610 | $text = $1;
|
---|
611 |
|
---|
612 | if ($msg_header =~ /^content\-type:\s*([\w\.\-\/]+)\s*\;?\s*(.+?)\s*$/mi)
|
---|
613 | {
|
---|
614 | $mimetype=$1;
|
---|
615 | $mimeinfo=$2;
|
---|
616 | $mimetype =~ tr/[A-Z]/[a-z]/;
|
---|
617 |
|
---|
618 | my $msg_text;
|
---|
619 | if ($mimetype =~ m@multipart/@) {
|
---|
620 | $msg_text = text_from_mime_message($self, $mimetype, $mimeinfo,
|
---|
621 | $text);
|
---|
622 | } else {
|
---|
623 | $msg_text=$self->text_from_part($text,$msg_header);
|
---|
624 | }
|
---|
625 |
|
---|
626 | my $brief_header=text_into_html(get_brief_headers($msg_header));
|
---|
627 | $text= "\n<b><<attached message>></b><br>";
|
---|
628 | $text.= "<table><tr><td width=\"5%\"> </td>\n";
|
---|
629 | $text.="<td>" . $brief_header . "\n</p>" . $msg_text
|
---|
630 | . "</td></tr></table>";
|
---|
631 | }
|
---|
632 | } else {
|
---|
633 | # we don't do any processing of the content.
|
---|
634 | }
|
---|
635 |
|
---|
636 | return $text;
|
---|
637 | }
|
---|
638 |
|
---|
639 |
|
---|
640 |
|
---|
641 | # used for turning a message id into a more friendly string for greenstone
|
---|
642 | sub escape_msg_id {
|
---|
643 | #msgid
|
---|
644 | my $id=shift;
|
---|
645 | chomp $id; $id =~ s!\s!!g; # remove spaces
|
---|
646 | $id =~ s![<>\[\]]!!g; # remove [ ] < and >
|
---|
647 | $id =~ s![_&]!-!g; # replace symbols that might cause problems
|
---|
648 | $id =~ s!@!-!g; # replace @ symbol, to avoid spambots
|
---|
649 | return $id;
|
---|
650 | }
|
---|
651 |
|
---|
652 |
|
---|
653 |
|
---|
654 | sub process_multipart_part {
|
---|
655 | my $self = shift;
|
---|
656 | my $message_part = shift;
|
---|
657 | my $is_first_part = shift;
|
---|
658 |
|
---|
659 | my $return_text="";
|
---|
660 | my $part_header=$message_part;
|
---|
661 | my $part_body;
|
---|
662 | if ($message_part=~ /^\s*\n/) {
|
---|
663 | # no header... use defaults
|
---|
664 | $part_body=$message_part;
|
---|
665 | $part_header="Content-type: text/plain; charset=us-ascii";
|
---|
666 | } elsif ($part_header=~s/\r?\n\r?\n(.*)$//s) {
|
---|
667 | $part_body=$1;
|
---|
668 | } else {
|
---|
669 | # something's gone wrong...
|
---|
670 | $part_header="";
|
---|
671 | $part_body=$message_part;
|
---|
672 | }
|
---|
673 |
|
---|
674 | $part_header =~ s/\r?\n[\t\ ]+/ /gs; #unfold
|
---|
675 | my $part_content_type="";
|
---|
676 | my $part_content_info="";
|
---|
677 |
|
---|
678 | if ($part_header =~ m@^content\-type:\s*([\w\.\-/]+)\s*(\;.*)?$@mi) {
|
---|
679 | $part_content_type=$1; $part_content_type =~ tr/A-Z/a-z/;
|
---|
680 | $part_content_info=$2;
|
---|
681 | if (!defined($part_content_info)) {
|
---|
682 | $part_content_info="";
|
---|
683 | } else {
|
---|
684 | $part_content_info =~ s/^\;\s*//;
|
---|
685 | $part_content_info =~ s/\s*$//;
|
---|
686 | }
|
---|
687 | }
|
---|
688 | my $filename="";
|
---|
689 | if ($part_header =~ m@name=\"?([^\"\n]+)\"?@mis) {
|
---|
690 | $filename=$1;
|
---|
691 | $filename =~ s@\r?\s*$@@; # remove trailing space, if any
|
---|
692 | }
|
---|
693 |
|
---|
694 | # disposition - either inline or attachment.
|
---|
695 | # NOT CURRENTLY USED - we display all text types instead...
|
---|
696 | # $part_header =~ /^content\-disposition:\s*([\w+])/mis;
|
---|
697 |
|
---|
698 | # add <<attachment>> to each part except the first...
|
---|
699 | if (!$is_first_part) {
|
---|
700 | $return_text.="\n<p><hr><strong><<attachment>>";
|
---|
701 | # add part info header
|
---|
702 | my $header_text="<br>Type: $part_content_type<br>\n";
|
---|
703 | if ($filename ne "") {
|
---|
704 | $header_text.="Filename: $filename\n";
|
---|
705 | }
|
---|
706 | $header_text =~ s@_@\\_@g;
|
---|
707 | $return_text.=$header_text . "</strong></p>\n<p>\n";
|
---|
708 | }
|
---|
709 |
|
---|
710 | if ($part_content_type =~ m@text/@)
|
---|
711 | {
|
---|
712 | my $part_text= $self->text_from_part($message_part);
|
---|
713 | if ($part_content_type !~ m@text/(ht|x)ml@) {
|
---|
714 | $part_text = text_into_html($part_text);
|
---|
715 | }
|
---|
716 | if ($part_text eq "") {
|
---|
717 | $part_text = ' ';
|
---|
718 | }
|
---|
719 | $return_text .= $part_text;
|
---|
720 | } elsif ($part_content_type =~ m@message/rfc822@) {
|
---|
721 | # This is a forwarded message
|
---|
722 | my $message_part_headers=$part_body;
|
---|
723 | $message_part_headers=~s/\r?\n\r?\n(.*)$//s;
|
---|
724 | my $message_part_body=$1;
|
---|
725 | $message_part_headers =~ s/\r?\n[\t\ ]+/ /gs; #unfold
|
---|
726 |
|
---|
727 | my $rfc822_formatted_body=""; # put result in here
|
---|
728 | if ($message_part_headers =~
|
---|
729 | /^content\-type:\s*([\w\.\-\/]+)\s*(\;.*)?$/ims)
|
---|
730 | {
|
---|
731 | # The message header uses MIME flags
|
---|
732 | my $message_content_type=$1;
|
---|
733 | my $message_content_info=$2;
|
---|
734 | if (!defined($message_content_info)) {
|
---|
735 | $message_content_info="";
|
---|
736 | } else {
|
---|
737 | $message_content_info =~ s/^\;\s*//;
|
---|
738 | $message_content_info =~ s/\s*$//;
|
---|
739 | }
|
---|
740 | $message_content_type =~ tr/A-Z/a-z/;
|
---|
741 | if ($message_content_type =~ /multipart/) {
|
---|
742 | $rfc822_formatted_body=
|
---|
743 | $self->text_from_mime_message($message_content_type,
|
---|
744 | $message_content_info,
|
---|
745 | $message_part_body);
|
---|
746 | } else {
|
---|
747 | $message_part_body=$self->text_from_part($part_body,
|
---|
748 | $message_part_headers);
|
---|
749 | $rfc822_formatted_body=text_into_html($message_part_body);
|
---|
750 | }
|
---|
751 | } else {
|
---|
752 | # message doesn't use MIME flags
|
---|
753 | $rfc822_formatted_body=text_into_html($message_part_body);
|
---|
754 | $rfc822_formatted_body =~ s@_@\\_@g;
|
---|
755 | }
|
---|
756 | # Add the returned text to the output
|
---|
757 | # don't put all the headers...
|
---|
758 | # $message_part_headers =~ s/^(X\-.*|received|message\-id|return\-path):.*\n//img;
|
---|
759 | my $brief_headers=get_brief_headers($message_part_headers);
|
---|
760 | $return_text.=text_into_html($brief_headers);
|
---|
761 | $return_text.="</p><p>\n";
|
---|
762 | $return_text.=$rfc822_formatted_body;
|
---|
763 | $return_text.="</p>\n";
|
---|
764 | # end of message/rfc822
|
---|
765 | } elsif ($part_content_type =~ /multipart/) {
|
---|
766 | # recurse again
|
---|
767 |
|
---|
768 | my $tmptext= $self->text_from_mime_message($part_content_type,
|
---|
769 | $part_content_info,
|
---|
770 | $part_body);
|
---|
771 | $return_text.=$tmptext;
|
---|
772 | } else {
|
---|
773 | # this part isn't text/* or another message...
|
---|
774 | if ($is_first_part) {
|
---|
775 | # this is the first part of a multipart, or only part!
|
---|
776 | $return_text="\n<p><hr><strong><<attachment>>";
|
---|
777 | # add part info header
|
---|
778 | my $header_text="<br>Type: $part_content_type<br>\n";
|
---|
779 | $header_text.="Filename: $filename</strong></p>\n<p>\n";
|
---|
780 | $header_text =~ s@_@\\_@g;
|
---|
781 | $return_text.=$header_text;
|
---|
782 | }
|
---|
783 |
|
---|
784 | # save attachment by default
|
---|
785 | if (!$self->{'no_attachments'}
|
---|
786 | && $filename ne "") { # this part has a file...
|
---|
787 | my $encoding="8bit";
|
---|
788 | if ($part_header =~
|
---|
789 | /^content-transfer-encoding:\s*(\w+)/mi ) {
|
---|
790 | $encoding=$1; $encoding =~ tr/A-Z/a-z/;
|
---|
791 | }
|
---|
792 | my $tmpdir=$ENV{'GSDLHOME'} . "/tmp";
|
---|
793 | my $save_filename=$filename;
|
---|
794 |
|
---|
795 | # make sure we don't clobber files with same name;
|
---|
796 | # need to keep state between .mbx files
|
---|
797 | my $assoc_files=$self->{'assoc_filenames'};
|
---|
798 | if ($assoc_files->{$filename}) { # it's been set...
|
---|
799 | $assoc_files->{$filename}++;
|
---|
800 | $filename =~ m/(.+)\.(\w+)$/;
|
---|
801 | my ($filestem, $ext)=($1,$2);
|
---|
802 | $save_filename="${filestem}_"
|
---|
803 | . $assoc_files->{$filename} . ".$ext";
|
---|
804 | } else { # first file with this name
|
---|
805 | $assoc_files->{$filename}=1;
|
---|
806 | }
|
---|
807 | open (SAVE, ">$tmpdir/$save_filename") ||
|
---|
808 | warn "EMAILPlug: Can't save attachment as $tmpdir/$save_filename: $!";
|
---|
809 | my $part_text = $message_part;
|
---|
810 | $part_text =~ s/(.*?)\r?\n\r?\n//s; # remove header
|
---|
811 | if ($encoding eq "base64") {
|
---|
812 | print SAVE base64_decode($part_text);
|
---|
813 | } elsif ($encoding eq "quoted-printable") {
|
---|
814 | print SAVE qp_decode($part_text);
|
---|
815 | } else { # 7bit, 8bit, binary, etc...
|
---|
816 | print SAVE $part_text;
|
---|
817 | }
|
---|
818 | close SAVE;
|
---|
819 | my $doc_obj=$self->{'doc_obj'};
|
---|
820 | $doc_obj->associate_file("$tmpdir/$save_filename",
|
---|
821 | "$save_filename",
|
---|
822 | $part_content_type # mimetype
|
---|
823 | );
|
---|
824 | # clean up tmp area...
|
---|
825 | # Can't do this as it hasn't been copied/linked yet!!!
|
---|
826 | # &util::rm("$tmpdir/$save_filename");
|
---|
827 | my $outhandle=$self->{'outhandle'};
|
---|
828 | print $outhandle "EMAILPlug: saving attachment \"$filename\"\n"; #
|
---|
829 |
|
---|
830 | # be nice if "download" was a translatable macro :(
|
---|
831 | $return_text .="<a href=\"_httpdocimg_/$save_filename\">download</a>";
|
---|
832 | } # end of save attachment
|
---|
833 | } # end of !text/message part
|
---|
834 |
|
---|
835 |
|
---|
836 | return $return_text;
|
---|
837 | }
|
---|
838 |
|
---|
839 |
|
---|
840 | # Return only the "important" headers from a set of message headers
|
---|
841 | sub get_brief_headers {
|
---|
842 | my $msg_header = shift;
|
---|
843 | my $brief_header = "";
|
---|
844 |
|
---|
845 | # Order matters!
|
---|
846 | if ($msg_header =~ /^(From:.*)$/im) {$brief_header.="$1\n";}
|
---|
847 | if ($msg_header =~ /^(To:.*)$/im) {$brief_header.="$1\n";}
|
---|
848 | if ($msg_header =~ /^(Cc:.*)$/im) {$brief_header.="$1\n";}
|
---|
849 | if ($msg_header =~ /^(Subject:.*)$/im) {$brief_header.="$1\n";}
|
---|
850 | if ($msg_header =~ /^(Date:.*)$/im) {$brief_header.="$1\n";}
|
---|
851 |
|
---|
852 | return $brief_header;
|
---|
853 | }
|
---|
854 |
|
---|
855 |
|
---|
856 | # Process a MIME part. Return "" if we can't decode it.
|
---|
857 | # should only be called for parts with type "text/*" ?
|
---|
858 | # Either pass the entire mime part (including the part's header),
|
---|
859 | # or pass the mime part's text and optionally the part's header.
|
---|
860 | sub text_from_part {
|
---|
861 | my $self = shift;
|
---|
862 | my $text = shift || '';
|
---|
863 | my $part_header = shift;
|
---|
864 |
|
---|
865 | my $type="text/plain"; # default, overridden from part header
|
---|
866 | my $charset="ascii"; # default, overridden from part header
|
---|
867 |
|
---|
868 | if (! $part_header) { # no header argument was given. check the body
|
---|
869 | $part_header = $text;
|
---|
870 | # check for empty part header (leading blank line)
|
---|
871 | if ($text =~ /^\s*\r?\n/) {
|
---|
872 | $part_header="Content-type: text/plain; charset=us-ascii";
|
---|
873 | } else {
|
---|
874 | $part_header =~ s/\r?\n\r?\n(.*)$//s;
|
---|
875 | $text=$1; if (!defined($text)) {$text="";}
|
---|
876 | }
|
---|
877 | $part_header =~ s/\r?\n[\t ]+/ /gs; #unfold
|
---|
878 | }
|
---|
879 |
|
---|
880 | if ($part_header =~
|
---|
881 | /content\-type:\s*([\w\.\-\/]+).*?charset=\"?([^\;\"\s]+)\"?/is) {
|
---|
882 | $type=$1;
|
---|
883 | $charset=$2;
|
---|
884 | }
|
---|
885 | my $encoding="";
|
---|
886 | if ($part_header =~ /^content\-transfer\-encoding:\s*([^\s]+)/mis) {
|
---|
887 | $encoding=$1; $encoding=~tr/A-Z/a-z/;
|
---|
888 | }
|
---|
889 | # Content-Transfer-Encoding is per-part
|
---|
890 | if ($encoding ne "") {
|
---|
891 | if ($encoding =~ /quoted\-printable/) {
|
---|
892 | $text=qp_decode($text);
|
---|
893 | } elsif ($encoding =~ /base64/) {
|
---|
894 | $text=base64_decode($text);
|
---|
895 | } elsif ($encoding !~ /[78]bit/) { # leave 7/8 bit as is.
|
---|
896 | # rfc2045 also allows binary, which we ignore (for now).
|
---|
897 | my $outhandle=$self->{'outhandle'};
|
---|
898 | print $outhandle "EMAILPlug: unknown transfer encoding: $encoding\n";
|
---|
899 | return "";
|
---|
900 | }
|
---|
901 | }
|
---|
902 | if ($type eq "text/html") {
|
---|
903 | # only get stuff between <body> tags, or <html> tags.
|
---|
904 | $text =~ s@^.*<html[^>]*>@@is;
|
---|
905 | $text =~ s@</html>.*$@@is;
|
---|
906 | $text =~ s/^.*?<body[^>]*>//si;
|
---|
907 | $text =~ s/<\/body>.*$//si;
|
---|
908 | }
|
---|
909 | elsif ($type eq "text/xml") {
|
---|
910 | $text=~s/</</g;$text=~s/>/>/g;
|
---|
911 | $text="<pre>\n$text\n</pre>\n";
|
---|
912 | }
|
---|
913 | # convert to unicode
|
---|
914 | $self->convert2unicode($charset, \$text);
|
---|
915 |
|
---|
916 | $text =~ s@_@\\_@g; # protect against GS macro language
|
---|
917 | return $text;
|
---|
918 | }
|
---|
919 |
|
---|
920 |
|
---|
921 |
|
---|
922 |
|
---|
923 | # decode quoted-printable text
|
---|
924 | sub qp_decode {
|
---|
925 | my $text=shift;
|
---|
926 |
|
---|
927 | # if a line ends with "=\s*", it is a soft line break, otherwise
|
---|
928 | # keep in any newline characters.
|
---|
929 |
|
---|
930 | $text =~ s/=\s*\r?\n//mg;
|
---|
931 | $text =~ s/=([0-9A-Fa-f]{2})/chr (hex "0x$1")/eg;
|
---|
932 | return $text;
|
---|
933 | }
|
---|
934 |
|
---|
935 | # decode base64 text. This is fairly slow (since it's interpreted perl rather
|
---|
936 | # than compiled XS stuff like in the ::MIME modules, but this is more portable
|
---|
937 | # for us at least).
|
---|
938 | # see rfc2045 for description, but basically, bits 7 and 8 are set to zero;
|
---|
939 | # 4 bytes of encoded text become 3 bytes of binary - remove 2 highest bits
|
---|
940 | # from each encoded byte.
|
---|
941 |
|
---|
942 |
|
---|
943 | sub base64_decode {
|
---|
944 | my $enc_text = shift;
|
---|
945 | # A=>0, B=>1, ..., '+'=>62, '/'=>63
|
---|
946 | # also '=' is used for padding at the end, but we remove it anyway.
|
---|
947 | my $mimechars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
---|
948 | # map each MIME char into it's value, for more efficient lookup.
|
---|
949 | my %index;
|
---|
950 | map { $index{$_} = index ($mimechars, $_) } (split ('', $mimechars));
|
---|
951 | # remove all non-base64 chars. eval to get variable in transliteration...
|
---|
952 | # also remove '=' - we'll assume (!!) that there are no errors in the encoding
|
---|
953 | eval "\$enc_text =~ tr|$mimechars||cd";
|
---|
954 | my $decoded="";
|
---|
955 | while (length ($enc_text)>3)
|
---|
956 | {
|
---|
957 | my $fourchars=substr($enc_text,0,4,"");
|
---|
958 | my @chars=(split '',$fourchars);
|
---|
959 | $decoded.=chr( $index{$chars[0]} << 2 | $index{$chars[1]} >> 4);
|
---|
960 | $decoded.=chr( ($index{$chars[1]} & 15) << 4 | $index{$chars[2]} >> 2);
|
---|
961 | $decoded.=chr( ($index{$chars[2]} & 3 ) << 6 | $index{$chars[3]});
|
---|
962 | }
|
---|
963 | # if there are any input chars left, there are either
|
---|
964 | # 2 encoded bytes (-> 1 raw byte) left or 3 encoded (-> 2 raw) bytes left.
|
---|
965 | my @chars=(split '',$enc_text);
|
---|
966 | if (length($enc_text)) {
|
---|
967 | $decoded.=chr($index{$chars[0]} << 2 | (int $index{$chars[1]} >> 4));
|
---|
968 | }
|
---|
969 | if (length($enc_text)==3) {
|
---|
970 | $decoded.=chr( ($index{$chars[1]} & 15) << 4 | $index{$chars[2]} >> 2);
|
---|
971 | }
|
---|
972 | return $decoded;
|
---|
973 | }
|
---|
974 |
|
---|
975 | sub convert2unicode {
|
---|
976 | my $self = shift(@_);
|
---|
977 | my ($charset, $textref) = @_;
|
---|
978 |
|
---|
979 | if (!$$textref) {
|
---|
980 | # nothing to do!
|
---|
981 | return;
|
---|
982 | }
|
---|
983 |
|
---|
984 | # first get our character encoding name in the right form.
|
---|
985 | $charset = "iso_8859_1" unless defined $charset;
|
---|
986 | $charset =~ tr/A-Z/a-z/; # lowercase
|
---|
987 | $charset =~ s/\-/_/g;
|
---|
988 | if ($charset =~ /gb_?2312/) { $charset="gb" }
|
---|
989 | # assumes EUC-KR, not ISO-2022 !?
|
---|
990 | $charset =~ s/^ks_c_5601_1987/korean/;
|
---|
991 | if ($charset eq 'utf_8') {$charset='utf8'}
|
---|
992 |
|
---|
993 | my $outhandle = $self->{'outhandle'};
|
---|
994 |
|
---|
995 | if ($charset eq "utf8") {
|
---|
996 | # no conversion needed, but lets check that it's valid utf8
|
---|
997 | # see utf-8 manpage for valid ranges
|
---|
998 | $$textref =~ m/^/g; # to set \G
|
---|
999 | my $badbytesfound=0;
|
---|
1000 | while ($$textref =~ m!\G.*?([\x80-\xff]+)!sg) {
|
---|
1001 | my $highbytes=$1;
|
---|
1002 | my $highbyteslength=length($highbytes);
|
---|
1003 | # replace any non utf8 complaint bytes
|
---|
1004 | $highbytes =~ /^/g; # set pos()
|
---|
1005 | while ($highbytes =~
|
---|
1006 | m!\G (?: [\xc0-\xdf][\x80-\xbf] | # 2 byte utf-8
|
---|
1007 | [\xe0-\xef][\x80-\xbf]{2} | # 3 byte
|
---|
1008 | [\xf0-\xf7][\x80-\xbf]{3} | # 4 byte
|
---|
1009 | [\xf8-\xfb][\x80-\xbf]{4} | # 5 byte
|
---|
1010 | [\xfc-\xfd][\x80-\xbf]{5} # 6 byte
|
---|
1011 | )*([\x80-\xff])? !xg
|
---|
1012 | ) {
|
---|
1013 | my $badbyte=$1;
|
---|
1014 | if (!defined $badbyte) {next} # hit end of string
|
---|
1015 | my $pos=pos($highbytes);
|
---|
1016 | substr($highbytes, $pos-1, 1, "\xc2\x80");
|
---|
1017 | # update the position to continue searching (for \G)
|
---|
1018 | pos($highbytes) = $pos+1; # set to just after the \x80
|
---|
1019 | $badbytesfound=1;
|
---|
1020 | }
|
---|
1021 | if ($badbytesfound==1) {
|
---|
1022 | # claims to be utf8, but it isn't!
|
---|
1023 | print $outhandle "EMAILPlug: Headers claim utf-8 but bad bytes "
|
---|
1024 | . "detected and removed.\n";
|
---|
1025 |
|
---|
1026 | my $replength=length($highbytes);
|
---|
1027 | my $textpos=pos($$textref);
|
---|
1028 | # replace bad bytes with good bytes
|
---|
1029 | substr( $$textref, $textpos-$replength,
|
---|
1030 | $replength, $highbytes);
|
---|
1031 | # update the position to continue searching (for \G)
|
---|
1032 | pos($$textref)=$textpos+($replength-$highbyteslength);
|
---|
1033 | }
|
---|
1034 | }
|
---|
1035 | return;
|
---|
1036 | }
|
---|
1037 |
|
---|
1038 | # It appears that we can't always trust ascii text so we'll treat it
|
---|
1039 | # as iso-8859-1 (letting characters above 0x80 through without
|
---|
1040 | # converting them to utf-8 will result in invalid XML documents
|
---|
1041 | # which can't be parsed at build time).
|
---|
1042 | $charset = "iso_8859_1" if ($charset eq "us_ascii" || $charset eq "ascii");
|
---|
1043 |
|
---|
1044 | if ($charset eq "iso_8859_1") {
|
---|
1045 | # test if the mailer lied, and it has win1252 chars in it...
|
---|
1046 | # 1252 has characters between 0x80 and 0x9f, 8859-1 doesn't
|
---|
1047 | if ($$textref =~ m/[\x80-\x9f]/) {
|
---|
1048 | print $outhandle "EMAILPlug: Headers claim ISO charset but MS ";
|
---|
1049 | print $outhandle "codepage 1252 detected.\n";
|
---|
1050 | $charset = "windows_1252";
|
---|
1051 | }
|
---|
1052 | }
|
---|
1053 | my $utf8_text=&unicode::unicode2utf8(&unicode::convert2unicode($charset,$textref));
|
---|
1054 |
|
---|
1055 | if ($utf8_text ne "") {
|
---|
1056 | $$textref=$utf8_text;
|
---|
1057 | } else {
|
---|
1058 | # we didn't get any text... unsupported encoding perhaps? Or it is
|
---|
1059 | # empty anyway. We'll try to continue, assuming 8859-1. We could strip
|
---|
1060 | # characters out here if this causes problems...
|
---|
1061 | my $outhandle=$self->{'outhandle'};
|
---|
1062 | print $outhandle "EMAILPlug: falling back to iso-8859-1\n";
|
---|
1063 | $$textref=&unicode::unicode2utf8(&unicode::convert2unicode("iso_8859_1",$textref));
|
---|
1064 |
|
---|
1065 | }
|
---|
1066 | }
|
---|
1067 |
|
---|
1068 |
|
---|
1069 | sub set_OID {
|
---|
1070 | my $self = shift (@_);
|
---|
1071 | my ($doc_obj, $id, $segment_number) = @_;
|
---|
1072 |
|
---|
1073 | if ( exists $doc_obj->{'msgid'} ) {
|
---|
1074 | $doc_obj->set_OID($doc_obj->{'msgid'});
|
---|
1075 | } else {
|
---|
1076 | $doc_obj->set_OID("$id\_$segment_number");
|
---|
1077 | }
|
---|
1078 | }
|
---|
1079 |
|
---|
1080 |
|
---|
1081 | # Perl packages have to return true if they are run.
|
---|
1082 | 1;
|
---|