source: gsdl/trunk/perllib/plugins/HTMLPlugin.pm@ 18320

Last change on this file since 18320 was 18320, checked in by ak19, 12 years ago

Now plugins provide the option of base64 encoding or url encoding filenames that are to be renamed (when copied into the archives dir). Previously renamed files would always be url-encoded. URL-encoding is the default now for most plugins except MP3Plugin and OggVorbisPlugin, where the default is base64 encoding. Base64 encoding filenames upon renaming them was introduced so that more files that browsers try to open in external applications can open them, since url encoding does not seem to be implemented the same everywhere (for instance, windows media player is unable to handle url-encoded wmv filenames when such files are launched in it through the browser).

  • Property svn:executable set to *
  • Property svn:keywords set to Author Date Id Revision
File size: 51.5 KB
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1###########################################################################
2#
3# HTMLPlugin.pm -- basic html plugin
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 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# Note that this plugin handles frames only in a very simple way
29# i.e. each frame is treated as a separate document. This means
30# search results will contain links to individual frames rather
31# than linking to the top level frameset.
32# There may also be some problems caused by the _parent target
33# (it's removed by this plugin)
34#
35
36package HTMLPlugin;
37
38use ReadTextFile;
39use HBPlugin;
40use ghtml;
41use unicode;
42use util;
43use XMLParser;
44
45use Image::Size;
46use File::Copy;
47
48sub BEGIN {
49 @HTMLPlugin::ISA = ('ReadTextFile', 'HBPlugin');
50}
51
52use strict; # every perl program should have this!
53no strict 'refs'; # make an exception so we can use variables as filehandles
54
55my $arguments =
56 [ { 'name' => "process_exp",
57 'desc' => "{BasePlugin.process_exp}",
58 'type' => "regexp",
59 'deft' => &get_default_process_exp() },
60 { 'name' => "block_exp",
61 'desc' => "{BasePlugin.block_exp}",
62 'type' => 'regexp',
63 'deft' => &get_default_block_exp() },
64 { 'name' => "nolinks",
65 'desc' => "{HTMLPlugin.nolinks}",
66 'type' => "flag" },
67 { 'name' => "keep_head",
68 'desc' => "{HTMLPlugin.keep_head}",
69 'type' => "flag" },
70 { 'name' => "no_metadata",
71 'desc' => "{HTMLPlugin.no_metadata}",
72 'type' => "flag" },
73 { 'name' => "metadata_fields",
74 'desc' => "{HTMLPlugin.metadata_fields}",
75 'type' => "string",
76 'deft' => "Title" },
77 { 'name' => "hunt_creator_metadata",
78 'desc' => "{HTMLPlugin.hunt_creator_metadata}",
79 'type' => "flag" },
80 { 'name' => "file_is_url",
81 'desc' => "{HTMLPlugin.file_is_url}",
82 'type' => "flag" },
83 { 'name' => "assoc_files",
84 'desc' => "{HTMLPlugin.assoc_files}",
85 'type' => "regexp",
86 'deft' => &get_default_block_exp() },
87 { 'name' => "rename_assoc_files",
88 'desc' => "{HTMLPlugin.rename_assoc_files}",
89 'type' => "flag" },
90 { 'name' => "title_sub",
91 'desc' => "{HTMLPlugin.title_sub}",
92 'type' => "string",
93 'deft' => "" },
94 { 'name' => "description_tags",
95 'desc' => "{HTMLPlugin.description_tags}",
96 'type' => "flag" },
97 # retain this for backward compatibility (w3mir option was replaced by
98 # file_is_url)
99 { 'name' => "w3mir",
100# 'desc' => "{HTMLPlugin.w3mir}",
101 'type' => "flag",
102 'hiddengli' => "yes"},
103 { 'name' => "no_strip_metadata_html",
104 'desc' => "{HTMLPlugin.no_strip_metadata_html}",
105 'type' => "string",
106 'deft' => "",
107 'reqd' => "no"},
108 { 'name' => "sectionalise_using_h_tags",
109 'desc' => "{HTMLPlugin.sectionalise_using_h_tags}",
110 'type' => "flag" },
111 { 'name' => "use_realistic_book",
112 'desc' => "{HTMLPlugin.tidy_html}",
113 'type' => "flag"},
114 { 'name' => "old_style_HDL",
115 'desc' => "{HTMLPlugin.old_style_HDL}",
116 'type' => "flag"}
117 ];
118
119my $options = { 'name' => "HTMLPlugin",
120 'desc' => "{HTMLPlugin.desc}",
121 'abstract' => "no",
122 'inherits' => "yes",
123 'args' => $arguments };
124
125
126sub HB_read_html_file {
127 my $self = shift (@_);
128 my ($htmlfile, $text) = @_;
129
130 # load in the file
131 if (!open (FILE, $htmlfile)) {
132 print STDERR "ERROR - could not open $htmlfile\n";
133 return;
134 }
135
136 my $foundbody = 0;
137 $self->HB_gettext (\$foundbody, $text, "FILE");
138 close FILE;
139
140 # just in case there was no <body> tag
141 if (!$foundbody) {
142 $foundbody = 1;
143 open (FILE, $htmlfile) || return;
144 $self->HB_gettext (\$foundbody, $text, "FILE");
145 close FILE;
146 }
147 # text is in utf8
148}
149
150# converts the text to utf8, as ghtml does that for &eacute; etc.
151sub HB_gettext {
152 my $self = shift (@_);
153 my ($foundbody, $text, $handle) = @_;
154
155 my $line = "";
156 while (defined ($line = <$handle>)) {
157 # look for body tag
158 if (!$$foundbody) {
159 if ($line =~ s/^.*<body[^>]*>//i) {
160 $$foundbody = 1;
161 } else {
162 next;
163 }
164 }
165
166 # check for symbol fonts
167 if ($line =~ m/<font [^>]*?face\s*=\s*\"?(\w+)\"?/i) {
168 my $font = $1;
169 print STDERR "HBPlug::HB_gettext - warning removed font $font\n"
170 if ($font !~ m/^arial$/i);
171 }
172
173 $$text .= $line;
174 }
175
176 if ($self->{'input_encoding'} eq "iso_8859_1") {
177 # convert to utf-8
178 $$text=&unicode::unicode2utf8(&unicode::convert2unicode("iso_8859_1", $text));
179 }
180 # convert any alphanumeric character entities to their utf-8
181 # equivalent for indexing purposes
182 #&ghtml::convertcharentities ($$text);
183
184 $$text =~ s/\s+/ /g; # remove \n's
185}
186
187sub HB_clean_section {
188 my $self = shift (@_);
189 my ($section) = @_;
190
191 # remove tags without a starting tag from the section
192 my ($tag, $tagstart);
193 while ($section =~ m/<\/([^>]{1,10})>/) {
194 $tag = $1;
195 $tagstart = index($section, "<$tag");
196 last if (($tagstart >= 0) && ($tagstart < index($section, "<\/$tag")));
197 $section =~ s/<\/$tag>//;
198 }
199
200 # remove extra paragraph tags
201 while ($section =~ s/<p\b[^>]*>\s*<p\b/<p/ig) {}
202
203 # remove extra stuff at the end of the section
204 while ($section =~ s/(<u>|<i>|<b>|<p\b[^>]*>|&nbsp;|\s)$//i) {}
205
206 # add a newline at the beginning of each paragraph
207 $section =~ s/(.)\s*<p\b/$1\n\n<p/gi;
208
209 # add a newline every 80 characters at a word boundary
210 # Note: this regular expression puts a line feed before
211 # the last word in each section, even when it is not
212 # needed.
213 $section =~ s/(.{1,80})\s/$1\n/g;
214
215 # fix up the image links
216 $section =~ s/<img[^>]*?src=\"?([^\">]+)\"?[^>]*>/
217 <center><img src=\"$1\" \/><\/center><br\/>/ig;
218 $section =~ s/&lt;&lt;I&gt;&gt;\s*([^\.]+\.(png|jpg|gif))/
219 <center><img src=\"$1\" \/><\/center><br\/>/ig;
220
221 return $section;
222}
223
224# Will convert the oldHDL format to the new HDL format (using the Section tag)
225sub convert_to_newHDLformat
226{
227 my $self = shift (@_);
228 my ($file,$cnfile) = @_;
229 my $input_filename = $file;
230 my $tmp_filename = $cnfile;
231
232 # write HTML tmp file with new HDL format
233 open (PROD, ">$tmp_filename") || die("Error Writing to File: $tmp_filename $!");
234
235 # read in the file and do basic html cleaning (removing header etc)
236 my $html = "";
237 $self->HB_read_html_file ($input_filename, \$html);
238
239 # process the file one section at a time
240 my $curtoclevel = 1;
241 my $firstsection = 1;
242 my $toclevel = 0;
243 while (length ($html) > 0) {
244 if ($html =~ s/^.*?(?:<p\b[^>]*>)?((<b>|<i>|<u>|\s)*)&lt;&lt;TOC(\d+)&gt;&gt;\s*(.*?)<p\b/<p/i) {
245 $toclevel = $3;
246 my $title = $4;
247 my $sectiontext = "";
248 if ($html =~ s/^(.*?)((?:<p\b[^>]*>)?((<b>|<i>|<u>|\s)*)&lt;&lt;TOC\d+&gt;&gt;)/$2/i) {
249 $sectiontext = $1;
250 } else {
251 $sectiontext = $html;
252 $html = "";
253 }
254
255 # remove tags and extra spaces from the title
256 $title =~ s/<\/?[^>]+>//g;
257 $title =~ s/^\s+|\s+$//g;
258
259 # close any sections below the current level and
260 # create a new section (special case for the firstsection)
261 print PROD "<!--\n";
262 while (($curtoclevel > $toclevel) ||
263 (!$firstsection && $curtoclevel == $toclevel)) {
264 $curtoclevel--;
265 print PROD "</Section>\n";
266 }
267 if ($curtoclevel+1 < $toclevel) {
268 print STDERR "WARNING - jump in toc levels in $input_filename " .
269 "from $curtoclevel to $toclevel\n";
270 }
271 while ($curtoclevel < $toclevel) {
272 $curtoclevel++;
273 }
274
275 if ($curtoclevel == 1) {
276 # add the header tag
277 print PROD "-->\n";
278 print PROD "<HTML>\n<HEAD>\n<TITLE>$title</TITLE>\n</HEAD>\n<BODY>\n";
279 print PROD "<!--\n";
280 }
281
282 print PROD "<Section>\n\t<Description>\n\t\t<Metadata name=\"Title\">$title</Metadata>\n\t</Description>\n";
283
284 print PROD "-->\n";
285
286 # clean up the section html
287 $sectiontext = $self->HB_clean_section($sectiontext);
288
289 print PROD "$sectiontext\n";
290
291 } else {
292 print STDERR "WARNING - leftover text\n" , $self->shorten($html),
293 "\nin $input_filename\n";
294 last;
295 }
296 $firstsection = 0;
297 }
298
299 print PROD "<!--\n";
300 while ($curtoclevel > 0) {
301 $curtoclevel--;
302 print PROD "</Section>\n";
303 }
304 print PROD "-->\n";
305
306 close (PROD) || die("Error Closing File: $tmp_filename $!");
307
308 return $tmp_filename;
309}
310
311sub shorten {
312 my $self = shift (@_);
313 my ($text) = @_;
314
315 return "\"$text\"" if (length($text) < 100);
316
317 return "\"" . substr ($text, 0, 50) . "\" ... \"" .
318 substr ($text, length($text)-50) . "\"";
319}
320
321sub convert_tidy_or_oldHDL_file
322{
323 my $self = shift (@_);
324 my ($file) = @_;
325 my $input_filename = $file;
326
327 if (-d $input_filename)
328 {
329 return $input_filename;
330 }
331
332 # get the input filename
333 my ($tailname, $dirname, $suffix) = &File::Basename::fileparse($input_filename, "\\.[^\\.]+\$");
334 my $base_dirname = $dirname;
335 $suffix = lc($suffix);
336
337 # derive tmp filename from input filename
338 # Remove any white space from filename -- no risk of name collision, and
339 # makes later conversion by utils simpler. Leave spaces in path...
340 # tidy up the filename with space, dot, hyphen between
341 $tailname =~ s/\s+//g;
342 $tailname =~ s/\.+//g;
343 $tailname =~ s/\-+//g;
344 # convert to utf-8 otherwise we have problems with the doc.xml file
345 # later on
346 &unicode::ensure_utf8(\$tailname);
347
348 # softlink to collection tmp dir
349 my $tmp_dirname = &util::filename_cat($ENV{'GSDLCOLLECTDIR'}, "tidytmp");
350 &util::mk_dir($tmp_dirname) if (!-e $tmp_dirname);
351
352 my $test_dirname = "";
353 my $f_separator = &util::get_os_dirsep();
354
355 if ($dirname =~ m/import$f_separator/)
356 {
357 $test_dirname = $'; #'
358
359 #print STDERR "init $'\n";
360
361 while ($test_dirname =~ m/[$f_separator]/)
362 {
363 my $folderdirname = $`;
364 $tmp_dirname = &util::filename_cat($tmp_dirname,$folderdirname);
365 &util::mk_dir($tmp_dirname) if (!-e $tmp_dirname);
366 $test_dirname = $'; #'
367 }
368 }
369
370 my $tmp_filename = &util::filename_cat($tmp_dirname, "$tailname$suffix");
371
372 # tidy or convert the input file if it is a HTML-like file or it is accepted by the process_exp
373 if (($suffix eq ".htm") || ($suffix eq ".html") || ($suffix eq ".shtml"))
374 {
375 #convert the input file to a new style HDL
376 my $hdl_output_filename = $input_filename;
377 if ($self->{'old_style_HDL'})
378 {
379 $hdl_output_filename = &util::filename_cat($tmp_dirname, "$tailname$suffix");
380 $hdl_output_filename = $self->convert_to_newHDLformat($input_filename,$hdl_output_filename);
381 }
382
383 #just for checking copy all other file from the base dir to tmp dir if it is not exists
384 opendir(DIR,$base_dirname) or die "Can't open base directory : $base_dirname!";
385 my @files = grep {!/^\.+$/} readdir(DIR);
386 close(DIR);
387
388 foreach my $file (@files)
389 {
390 my $src_file = &util::filename_cat($base_dirname,$file);
391 my $dest_file = &util::filename_cat($tmp_dirname,$file);
392 if ((!-e $dest_file) && (!-d $src_file))
393 {
394 # just copy the original file back to the tmp directory
395 copy($src_file,$dest_file) or die "Can't copy file $src_file to $dest_file $!";
396 }
397 }
398
399 # tidy the input file
400 my $tidy_output_filename = $hdl_output_filename;
401 if ($self->{'use_realistic_book'})
402 {
403 $tidy_output_filename = &util::filename_cat($tmp_dirname, "$tailname$suffix");
404 $tidy_output_filename = $self->tmp_tidy_file($hdl_output_filename,$tidy_output_filename);
405 }
406 $tmp_filename = $tidy_output_filename;
407 }
408 else
409 {
410 if (!-e $tmp_filename)
411 {
412 # just copy the original file back to the tmp directory
413 copy($input_filename,$tmp_filename) or die "Can't copy file $input_filename to $tmp_filename $!";
414 }
415 }
416
417 return $tmp_filename;
418}
419
420
421# Will make the html input file as a proper XML file with removed font tag and
422# image size added to the img tag.
423# The tidying process takes place in a collection specific 'tmp' directory so
424# that we don't accidentally damage the input.
425sub tmp_tidy_file
426{
427 my $self = shift (@_);
428 my ($file,$cnfile) = @_;
429 my $input_filename = $file;
430 my $tmp_filename = $cnfile;
431
432 # get the input filename
433 my ($tailname, $dirname, $suffix) = &File::Basename::fileparse($input_filename, "\\.[^\\.]+\$");
434
435 require HTML::TokeParser::Simple;
436
437 # create HTML parser to decode the input file
438 my $parser = HTML::TokeParser::Simple->new($input_filename);
439
440 # write HTML tmp file without the font tag and image size are added to the img tag
441 open (PROD, ">$tmp_filename") || die("Error Writing to File: $tmp_filename $!");
442 while (my $token = $parser->get_token())
443 {
444 # is it an img tag
445 if ($token->is_start_tag('img'))
446 {
447 # get the attributes
448 my $attr = $token->return_attr;
449
450 # get the full path to the image
451 my $img_file = &util::filename_cat($dirname,$attr->{src});
452
453 # set the width and height attribute
454 ($attr->{width}, $attr->{height}) = imgsize($img_file);
455
456 # recreate the tag
457 print PROD "<img";
458 print PROD map { qq { $_="$attr->{$_}"} } keys %$attr;
459 print PROD ">";
460 }
461 # is it a font tag
462 else
463 {
464 if (($token->is_start_tag('font')) || ($token->is_end_tag('font')))
465 {
466 # remove font tag
467 print PROD "";
468 }
469 else
470 {
471 # print without changes
472 print PROD $token->as_is;
473 }
474 }
475 }
476 close (PROD) || die("Error Closing File: $tmp_filename $!");
477
478 # run html-tidy on the tmp file to make it a proper XML file
479 my $tidyfile = `tidy -utf8 -wrap 0 -asxml "$tmp_filename"`;
480
481 # write result back to the tmp file
482 open (PROD, ">$tmp_filename") || die("Error Writing to File: $tmp_filename $!");
483 print PROD $tidyfile;
484 close (PROD) || die("Error Closing File: $tmp_filename $!");
485
486 # return the output filename
487 return $tmp_filename;
488}
489
490sub read_into_doc_obj
491{
492 my $self = shift (@_);
493 my ($pluginfo, $base_dir, $file, $block_hash, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
494
495 # get the input file
496 my $input_filename = $file;
497 my ($tailname, $dirname, $suffix) = &File::Basename::fileparse($input_filename, "\\.[^\\.]+\$");
498 $suffix = lc($suffix);
499
500 if (($self->{'use_realistic_book'}) || ($self->{'old_style_HDL'}))
501 {
502 # because the document has to be sectionalized set the description tags
503 $self->{'description_tags'} = 1;
504
505 # set the file to be tidied
506 $input_filename = &util::filename_cat($base_dir,$file) if $base_dir =~ m/\w/;
507
508 # get the tidied file
509 #my $tidy_filename = $self->tmp_tidy_file($input_filename);
510 my $tidy_filename = $self->convert_tidy_or_oldHDL_file($input_filename);
511
512 # derive tmp filename from input filename
513 my ($tailname, $dirname, $suffix) = &File::Basename::fileparse($tidy_filename, "\\.[^\\.]+\$");
514
515 # set the new input file and base_dir to be from the tidied file
516 $file = "$tailname$suffix";
517 $base_dir = $dirname;
518 }
519
520 # call the parent read_into_doc_obj
521 my ($process_status,$doc_obj) = $self->SUPER::read_into_doc_obj($pluginfo, $base_dir, $file, $block_hash, $metadata, $processor, $maxdocs, $total_count, $gli);
522
523 return ($process_status,$doc_obj);
524}
525
526sub new {
527 my ($class) = shift (@_);
528 my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
529 push(@$pluginlist, $class);
530
531 push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
532 push(@{$hashArgOptLists->{"OptList"}},$options);
533
534
535 my $self = new ReadTextFile($pluginlist,$inputargs,$hashArgOptLists);
536
537 if ($self->{'w3mir'}) {
538 $self->{'file_is_url'} = 1;
539 }
540 $self->{'aux_files'} = {};
541 $self->{'dir_num'} = 0;
542 $self->{'file_num'} = 0;
543
544 return bless $self, $class;
545}
546
547# may want to use (?i)\.(gif|jpe?g|jpe|png|css|js(?:@.*)?)$
548# if have eg <script language="javascript" src="img/lib.js@123">
549sub get_default_block_exp {
550 my $self = shift (@_);
551
552 #return q^(?i)\.(gif|jpe?g|jpe|jpg|png|css)$^;
553 return "";
554}
555
556sub get_default_process_exp {
557 my $self = shift (@_);
558
559 # the last option is an attempt to encode the concept of an html query ...
560 return q^(?i)(\.html?|\.shtml|\.shm|\.asp|\.php\d?|\.cgi|.+\?.+=.*)$^;
561}
562
563sub store_block_files
564{
565 my $self =shift (@_);
566 my ($filename_full_path, $block_hash) = @_;
567
568 my $html_fname = $filename_full_path;
569 my @file_blocks;
570
571 my ($language, $encoding) = $self->textcat_get_language_encoding ($filename_full_path);
572
573 # read in file ($text will be in utf8)
574 my $raw_text = "";
575 $self->read_file_no_decoding ($filename_full_path, \$raw_text);
576
577 my $textref = \$raw_text;
578 my $opencom = '(?:<!--|&lt;!(?:&mdash;|&#151;|--))';
579 my $closecom = '(?:-->|(?:&mdash;|&#151;|--)&gt;)';
580 $$textref =~ s/$opencom(.*?)$closecom//gs;
581
582 my $attval = "\\\"[^\\\"]+\\\"|[^\\s>]+";
583 my @img_matches = ($$textref =~ m/<img[^>]*?src\s*=\s*($attval)[^>]*>/igs);
584 my @usemap_matches = ($$textref =~ m/<img[^>]*?usemap\s*=\s*($attval)[^>]*>/igs);
585 my @link_matches = ($$textref =~ m/<link[^>]*?href\s*=\s*($attval)[^>]*>/igs);
586 my @embed_matches = ($$textref =~ m/<embed[^>]*?src\s*=\s*($attval)[^>]*>/igs);
587 my @tabbg_matches = ($$textref =~ m/<(?:body|table|tr|td)[^>]*?background\s*=\s*($attval)[^>]*>/igs);
588 my @script_matches = ($$textref =~ m/<script[^>]*?src\s*=\s*($attval)[^>]*>/igs);
589
590 if(!defined $self->{'utf8_to_original_filename'}) {
591 # maps from utf8 converted link name -> original filename referrred to by (possibly URL-encoded) src url
592 $self->{'utf8_to_original_filename'} = {};
593 }
594
595 foreach my $link (@img_matches, @usemap_matches, @link_matches, @embed_matches, @tabbg_matches, @script_matches) {
596
597 # remove quotes from link at start and end if necessary
598 if ($link=~/^\"/) {
599 $link=~s/^\"//;
600 $link=~s/\"$//;
601 }
602
603 $link =~ s/\#.*$//s; # remove any anchor names, e.g. foo.html#name becomes foo.html
604 # some links may just be anchor names
605 next unless ($link =~ /\S+/);
606
607 if ($link !~ m@^/@ && $link !~ m/^([A-Z]:?)\\/) {
608 # Turn relative file path into full path
609 my $dirname = &File::Basename::dirname($filename_full_path);
610 $link = &util::filename_cat($dirname, $link);
611 }
612 $link = $self->eval_dir_dots($link);
613
614 # this is the actual filename on the filesystem (that the link refers to)
615 my $url_original_filename = $self->opt_url_decode($link);
616
617 # Convert the url_original_filename into its utf8 version. Store the utf8 link along with the url_original_filename
618 my $utf8_link = "";
619 $self->decode_text($link,$encoding,$language,\$utf8_link);
620
621 $self->{'utf8_to_original_filename'}->{$utf8_link} = $url_original_filename;
622# print STDERR "**** utf8_encoded_link to original src filename:\n\t$utf8_link\n\t".$self->{'utf8_to_original_filename'}->{$utf8_link}."\n";
623
624 if ($url_original_filename ne $utf8_link) {
625 my $outhandle = $self->{'outhandle'};
626
627 print $outhandle "URL Encoding $url_original_filename\n";
628 print $outhandle " ->$utf8_link\n";
629 }
630
631 $block_hash->{'file_blocks'}->{$url_original_filename} = 1;
632 }
633}
634
635# Given a filename in any encoding, will URL decode it to get back the original filename
636# in the original encoding. Because this method is intended to work out the *original*
637# filename*, it does not URL decode any filename if a file by the name of the *URL-encoded*
638# string already exists in the local folder.
639# Return the original filename corresponding to the parameter URL-encoded filename, and
640# a decoded flag that is set to true iff URL-decoding had to be applied.
641sub opt_url_decode {
642 my $self = shift (@_);
643 my ($link) = @_;
644
645 # Replace %XX's in URL with decoded value if required.
646 # Note that the filename may include the %XX in some situations
647 if ($link =~ m/\%[A-F0-9]{2}/i) {
648 if (!-e $link) {
649 $link = &unicode::url_decode($link);
650 }
651 }
652
653 return $link;
654}
655
656
657# do plugin specific processing of doc_obj
658sub process {
659 my $self = shift (@_);
660 my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
661 my $outhandle = $self->{'outhandle'};
662
663 if ($ENV{'GSDLOS'} =~ m/^windows/i) {
664 # this makes life so much easier... perl can cope with unix-style '/'s.
665 $base_dir =~ s@(\\)+@/@g;
666 $file =~ s@(\\)+@/@g;
667 }
668
669 # reset per-doc stuff...
670 $self->{'aux_files'} = {};
671 $self->{'dir_num'} = 0;
672 $self->{'file_num'} = 0;
673
674 # process an HTML file where sections are divided by headings tags (H1, H2 ...)
675 # you can also include metadata in the format (X can be any number)
676 # <hX>Title<!--gsdl-metadata
677 # <Metadata name="name1">value1</Metadata>
678 # ...
679 # <Metadata name="nameN">valueN</Metadata>
680 #--></hX>
681 if ($self->{'sectionalise_using_h_tags'}) {
682 # description_tags should allways be activated because we convert headings to description tags
683 $self->{'description_tags'} = 1;
684
685 my $arrSections = [];
686 $$textref =~ s/<h([0-9]+)[^>]*>(.*?)<\/h[0-9]+>/$self->process_heading($1, $2, $arrSections, $file)/isge;
687
688 if (scalar(@$arrSections)) {
689 my $strMetadata = $self->update_section_data($arrSections, -1);
690 if (length($strMetadata)) {
691 $strMetadata = '<!--' . $strMetadata . "\n-->\n</body>";
692 $$textref =~ s/<\/body>/$strMetadata/ig;
693 }
694 }
695 }
696
697 my $cursection = $doc_obj->get_top_section();
698
699 $self->extract_metadata ($textref, $metadata, $doc_obj, $cursection)
700 unless $self->{'no_metadata'} || $self->{'description_tags'};
701
702 # Store URL for page as metadata - this can be used for an
703 # altavista style search interface. The URL won't be valid
704 # unless the file structure contains the domain name (i.e.
705 # like when w3mir is used to download a website).
706
707 # URL metadata (even invalid ones) are used to support internal
708 # links, so even if 'file_is_url' is off, still need to store info
709
710 my ($tailname,$dirname,$suffix) = &File::Basename::fileparse($file, "\\.[^\\.]+\$");
711 my $utf8_file = $self->filename_to_utf8_metadata($file);
712 my $web_url = "http://";
713 if(defined $dirname) { # local directory
714 $dirname = $self->eval_dir_dots($dirname);
715 $dirname .= "/" if $dirname ne ""; # if there's a directory, it should end on "/"
716 $web_url = $web_url.$dirname.$utf8_file;
717 } else {
718 $web_url = $web_url.$utf8_file;
719 }
720
721 $doc_obj->add_utf8_metadata($cursection, "URL", $web_url);
722
723 if ($self->{'file_is_url'}) {
724 $doc_obj->add_metadata($cursection, "weblink", "<a href=\"$web_url\">");
725 $doc_obj->add_metadata($cursection, "webicon", "_iconworld_");
726 $doc_obj->add_metadata($cursection, "/weblink", "</a>");
727 }
728
729 if ($self->{'description_tags'}) {
730 # remove the html header - note that doing this here means any
731 # sections defined within the header will be lost (so all <Section>
732 # tags must appear within the body of the HTML)
733 my ($head_keep) = ($$textref =~ m/^(.*?)<body[^>]*>/is);
734
735 $$textref =~ s/^.*?<body[^>]*>//is;
736 $$textref =~ s/(<\/body[^>]*>|<\/html[^>]*>)//isg;
737
738 my $opencom = '(?:<!--|&lt;!(?:&mdash;|&#151;|--))';
739 my $closecom = '(?:-->|(?:&mdash;|&#151;|--)&gt;)';
740
741 my $lt = '(?:<|&lt;)';
742 my $gt = '(?:>|&gt;)';
743 my $quot = '(?:"|&quot;|&rdquo;|&ldquo;)';
744
745 my $dont_strip = '';
746 if ($self->{'no_strip_metadata_html'}) {
747 ($dont_strip = $self->{'no_strip_metadata_html'}) =~ s{,}{|}g;
748 }
749
750 my $found_something = 0; my $top = 1;
751 while ($$textref =~ s/^(.*?)$opencom(.*?)$closecom//s) {
752 my $text = $1;
753 my $comment = $2;
754 if (defined $text) {
755 # text before a comment - note that getting to here
756 # doesn't necessarily mean there are Section tags in
757 # the document
758 $self->process_section(\$text, $base_dir, $file, $doc_obj, $cursection);
759 }
760 while ($comment =~ s/$lt(.*?)$gt//s) {
761 my $tag = $1;
762 if ($tag eq "Section") {
763 $found_something = 1;
764 $cursection = $doc_obj->insert_section($doc_obj->get_end_child($cursection)) unless $top;
765 $top = 0;
766 } elsif ($tag eq "/Section") {
767 $found_something = 1;
768 $cursection = $doc_obj->get_parent_section ($cursection);
769 } elsif ($tag =~ m/^Metadata name=$quot(.*?)$quot/s) {
770 my $metaname = $1;
771 my $accumulate = $tag =~ m/mode=${quot}accumulate${quot}/ ? 1 : 0;
772 $comment =~ s/^(.*?)$lt\/Metadata$gt//s;
773 my $metavalue = $1;
774 $metavalue =~ s/^\s+//;
775 $metavalue =~ s/\s+$//;
776 # assume that no metadata value intentionally includes
777 # carriage returns or HTML tags (if they're there they
778 # were probably introduced when converting to HTML from
779 # some other format).
780 # actually some people want to have html tags in their
781 # metadata.
782 $metavalue =~ s/[\cJ\cM]/ /sg;
783 $metavalue =~ s/<[^>]+>//sg
784 unless $dont_strip && ($dont_strip eq 'all' || $metaname =~ m/^($dont_strip)$/);
785 $metavalue =~ s/\s+/ /sg;
786 if ($accumulate) {
787 $doc_obj->add_utf8_metadata($cursection, $metaname, $metavalue);
788 } else {
789 $doc_obj->set_utf8_metadata_element($cursection, $metaname, $metavalue);
790 }
791 } elsif ($tag eq "Description" || $tag eq "/Description") {
792 # do nothing with containing Description tags
793 } else {
794 # simple HTML tag (probably created by the conversion
795 # to HTML from some other format) - we'll ignore it and
796 # hope for the best ;-)
797 }
798 }
799 }
800 if ($cursection ne "") {
801 print $outhandle "HTMLPlugin: WARNING: $file contains unmatched <Section></Section> tags\n";
802 }
803
804 $$textref =~ s/^.*?<body[^>]*>//is;
805 $$textref =~ s/(<\/body[^>]*>|<\/html[^>]*>)//isg;
806 if ($$textref =~ m/\S/) {
807 if (!$found_something) {
808 if ($self->{'verbosity'} > 2) {
809 print $outhandle "HTMLPlugin: WARNING: $file appears to contain no Section tags so\n";
810 print $outhandle " will be processed as a single section document\n";
811 }
812
813 # go ahead and process single-section document
814 $self->process_section($textref, $base_dir, $file, $doc_obj, $cursection);
815
816 # if document contains no Section tags we'll go ahead
817 # and extract metadata (this won't have been done
818 # above as the -description_tags option prevents it)
819 my $complete_text = $head_keep.$doc_obj->get_text($cursection);
820 $self->extract_metadata (\$complete_text, $metadata, $doc_obj, $cursection)
821 unless $self->{'no_metadata'};
822
823 } else {
824 print $outhandle "HTMLPlugin: WARNING: $file contains the following text outside\n";
825 print $outhandle " of the final closing </Section> tag. This text will\n";
826 print $outhandle " be ignored.";
827
828 my ($text);
829 if (length($$textref) > 30) {
830 $text = substr($$textref, 0, 30) . "...";
831 } else {
832 $text = $$textref;
833 }
834 $text =~ s/\n/ /isg;
835 print $outhandle " ($text)\n";
836 }
837 } elsif (!$found_something) {
838
839 if ($self->{'verbosity'} > 2) {
840 # may get to here if document contained no valid Section
841 # tags but did contain some comments. The text will have
842 # been processed already but we should print the warning
843 # as above and extract metadata
844 print $outhandle "HTMLPlugin: WARNING: $file appears to contain no Section tags and\n";
845 print $outhandle " is blank or empty. Metadata will be assigned if present.\n";
846 }
847
848 my $complete_text = $head_keep.$doc_obj->get_text($cursection);
849 $self->extract_metadata (\$complete_text, $metadata, $doc_obj, $cursection)
850 unless $self->{'no_metadata'};
851 }
852
853 } else {
854
855 # remove header and footer
856 if (!$self->{'keep_head'} || $self->{'description_tags'}) {
857 $$textref =~ s/^.*?<body[^>]*>//is;
858 $$textref =~ s/(<\/body[^>]*>|<\/html[^>]*>)//isg;
859 }
860
861 # single section document
862 $self->process_section($textref, $base_dir, $file, $doc_obj, $cursection);
863 }
864 return 1;
865}
866
867
868sub process_heading
869{
870 my ($self, $nHeadNo, $strHeadingText, $arrSections, $file) = @_;
871 $strHeadingText = '' if (!defined($strHeadingText));
872
873 my $strMetadata = $self->update_section_data($arrSections, int($nHeadNo));
874
875 my $strSecMetadata = '';
876 while ($strHeadingText =~ s/<!--gsdl-metadata(.*?)-->//is)
877 {
878 $strSecMetadata .= $1;
879 }
880
881 $strHeadingText =~ s/^\s+//g;
882 $strHeadingText =~ s/\s+$//g;
883 $strSecMetadata =~ s/^\s+//g;
884 $strSecMetadata =~ s/\s+$//g;
885
886 $strMetadata .= "\n<Section>\n\t<Description>\n\t\t<Metadata name=\"Title\">" . $strHeadingText . "</Metadata>\n";
887
888 if (length($strSecMetadata)) {
889 $strMetadata .= "\t\t" . $strSecMetadata . "\n";
890 }
891
892 $strMetadata .= "\t</Description>\n";
893
894 return "<!--" . $strMetadata . "-->";
895}
896
897
898sub update_section_data
899{
900 my ($self, $arrSections, $nCurTocNo) = @_;
901 my ($strBuffer, $nLast, $nSections) = ('', 0, scalar(@$arrSections));
902
903 if ($nSections == 0) {
904 push @$arrSections, $nCurTocNo;
905 return $strBuffer;
906 }
907 $nLast = $arrSections->[$nSections - 1];
908 if ($nCurTocNo > $nLast) {
909 push @$arrSections, $nCurTocNo;
910 return $strBuffer;
911 }
912 for(my $i = $nSections - 1; $i >= 0; $i--) {
913 if ($nCurTocNo <= $arrSections->[$i]) {
914 $strBuffer .= "\n</Section>";
915 pop @$arrSections;
916 }
917 }
918 push @$arrSections, $nCurTocNo;
919 return $strBuffer;
920}
921
922
923# note that process_section may be called multiple times for a single
924# section (relying on the fact that add_utf8_text appends the text to any
925# that may exist already).
926sub process_section {
927 my $self = shift (@_);
928 my ($textref, $base_dir, $file, $doc_obj, $cursection) = @_;
929 # trap links
930 if (!$self->{'nolinks'}) {
931 # usemap="./#index" not handled correctly => change to "#index"
932## $$textref =~ s/(<img[^>]*?usemap\s*=\s*[\"\']?)([^\"\'>\s]+)([\"\']?[^>]*>)/
933
934 $$textref =~ s/(<img[^>]*?usemap\s*=\s*)((?:[\"][^\"]+[\"])|(?:[\'][^\']+[\'])|(?:[^\s\/>]+))([^>]*>)/
935 $self->replace_usemap_links($1, $2, $3)/isge;
936
937## $$textref =~ s/(<(?:a|area|frame|link|script)\s+[^>]*?\s*(?:href|src)\s*=\s*[\"\']?)([^\"\'>\s]+)([\"\']?[^>]*>)/
938
939 $$textref =~ s/(<(?:a|area|frame|link|script)\s+[^>]*?\s*(?:href|src)\s*=\s*)((?:[\"][^\"]+[\"])|(?:[\'][^\']+[\'])|(?:[^\s\/>]+))([^>]*>)/
940 $self->replace_href_links ($1, $2, $3, $base_dir, $file, $doc_obj, $cursection)/isge;
941 }
942
943 # trap images
944
945 # Previously, by default, HTMLPlugin would embed <img> tags inside anchor tags
946 # i.e. <a href="image><img src="image"></a> in order to overcome a problem that
947 # turned regular text succeeding images into links. That is, by embedding <imgs>
948 # inside <a href=""></a>, the text following images were no longer misbehaving.
949 # However, there would be many occasions whereby images were not meant to link
950 # to their source images but where the images would link to another web page.
951 # To allow this, the no_image_links option was introduced: it would prevent
952 # the behaviour of embedding images into links that referenced the source images.
953
954 # Somewhere along the line, the problem of normal text turning into links when
955 # such text followed images which were not embedded in <a href=""></a> ceased
956 # to occur. This is why the following lines have been commented out (as well as
957 # two lines in replace_images). They appear to no longer apply.
958
959 # If at any time, there is a need for having images embedded in <a> anchor tags,
960 # then it might be better to turn that into an HTMLPlugin option rather than make
961 # it the default behaviour. Also, eventually, no_image_links needs to become
962 # a deprecated option for HTMLPlugin as it has now become the default behaviour.
963
964 #if(!$self->{'no_image_links'}){
965 $$textref =~ s/(<(?:img|embed|table|tr|td)[^>]*?(?:src|background)\s*=\s*)((?:[\"][^\"]+[\"])|(?:[\'][^\']+[\'])|(?:[^\s\/>]+))([^>]*>)/
966 $self->replace_images ($1, $2, $3, $base_dir, $file, $doc_obj, $cursection)/isge;
967 #}
968
969 # add text to document object
970 # turn \ into \\ so that the rest of greenstone doesn't think there
971 # is an escape code following. (Macro parsing loses them...)
972 $$textref =~ s/\\/\\\\/go;
973
974 $doc_obj->add_utf8_text($cursection, $$textref);
975}
976
977sub replace_images {
978 my $self = shift (@_);
979 my ($front, $link, $back, $base_dir,
980 $file, $doc_obj, $section) = @_;
981
982 # remove quotes from link at start and end if necessary
983 if ($link=~/^[\"\']/) {
984 $link=~s/^[\"\']//;
985 $link=~s/[\"\']$//;
986 $front.='"';
987 $back="\"$back";
988 }
989
990 $link =~ s/\n/ /g;
991
992 # Hack to overcome Windows wv 0.7.1 bug that causes embedded images to be broken
993 # If the Word file path has spaces in it, wv messes up and you end up with
994 # absolute paths for the images, and without the "file://" prefix
995 # So check for this special case and massage the data to be correct
996 if ($ENV{'GSDLOS'} =~ m/^windows/i && $self->{'plugin_type'} eq "WordPlug" && $link =~ m/^[A-Za-z]\:\\/) {
997 $link =~ s/^.*\\([^\\]+)$/$1/;
998 }
999
1000 my ($href, $hash_part, $rl) = $self->format_link ($link, $base_dir, $file);
1001
1002 my $img_file = $self->add_file ($href, $rl, $hash_part, $base_dir, $doc_obj, $section);
1003
1004# print STDERR "**** link = $link\n**** href = $href\n**** img_file = $img_file, rl = $rl\n";
1005
1006 my $anchor_name = $img_file;
1007 #$anchor_name =~ s/^.*\///;
1008 #$anchor_name = "<a name=\"$anchor_name\" ></a>";
1009
1010 my $image_link = $front . $img_file .$back;
1011 return $image_link;
1012
1013 # The reasons for why the following two lines are no longer necessary can be
1014 # found in subroutine process_section
1015 #my $anchor_link = "<a href=\"$img_file\" >".$image_link."</a>";
1016 #return $anchor_link;
1017
1018 #return $front . $img_file . $back . $anchor_name;
1019}
1020
1021sub replace_href_links {
1022 my $self = shift (@_);
1023 my ($front, $link, $back, $base_dir, $file, $doc_obj, $section) = @_;
1024
1025 # remove quotes from link at start and end if necessary
1026 if ($link=~/^[\"\']/) {
1027 $link=~s/^[\"\']//;
1028 $link=~s/[\"\']$//;
1029 $front.='"';
1030 $back="\"$back";
1031 }
1032
1033 # attempt to sort out targets - frames are not handled
1034 # well in this plugin and some cases will screw things
1035 # up - e.g. the _parent target (so we'll just remove
1036 # them all ;-)
1037 $front =~ s/(target=\"?)_top(\"?)/$1_gsdltop_$2/is;
1038 $back =~ s/(target=\"?)_top(\"?)/$1_gsdltop_$2/is;
1039 $front =~ s/target=\"?_parent\"?//is;
1040 $back =~ s/target=\"?_parent\"?//is;
1041
1042 return $front . $link . $back if $link =~ m/^\#/s;
1043 $link =~ s/\n/ /g;
1044
1045 # Find file referred to by $link on file system
1046 # This is more complicated than it sounds when char encodings
1047 # is taken in to account
1048 my ($href, $hash_part, $rl) = $self->format_link ($link, $base_dir, $file);
1049
1050 # href may use '\'s where '/'s should be on Windows
1051 $href =~ s/\\/\//g;
1052 my ($filename) = $href =~ m/^(?:.*?):(?:\/\/)?(.*)/;
1053
1054
1055 ##### leave all these links alone (they won't be picked up by intermediate
1056 ##### pages). I think that's safest when dealing with frames, targets etc.
1057 ##### (at least until I think of a better way to do it). Problems occur with
1058 ##### mailto links from within small frames, the intermediate page is displayed
1059 ##### within that frame and can't be seen. There is still potential for this to
1060 ##### happen even with html pages - the solution seems to be to somehow tell
1061 ##### the browser from the server side to display the page being sent (i.e.
1062 ##### the intermediate page) in the top level window - I'm not sure if that's
1063 ##### possible - the following line should probably be deleted if that can be done
1064 return $front . $link . $back if $href =~ m/^(mailto|news|gopher|nntp|telnet|javascript):/is;
1065
1066
1067 if (($rl == 0) || ($filename =~ m/$self->{'process_exp'}/) ||
1068 ($href =~ m/\/$/) || ($href =~ m/^(mailto|news|gopher|nntp|telnet|javascript):/i)) {
1069 &ghtml::urlsafe ($href);
1070 return $front . "_httpextlink_&rl=" . $rl . "&href=" . $href . $hash_part . $back;
1071 } else {
1072 # link is to some other type of file (eg image) so we'll
1073 # need to associate that file
1074 return $front . $self->add_file ($href, $rl, $hash_part, $base_dir, $doc_obj, $section) . $back;
1075 }
1076}
1077
1078sub add_file {
1079 my $self = shift (@_);
1080 my ($href, $rl, $hash_part, $base_dir, $doc_obj, $section) = @_;
1081 my ($newname);
1082
1083 my $filename = $href;
1084 if ($base_dir eq "") {
1085 # remove http:/ thereby leaving one slash at the start
1086 $filename =~ s/^[^:]*:\///;
1087 }
1088 else {
1089 # remove http://
1090 $filename =~ s/^[^:]*:\/\///;
1091 }
1092
1093 $filename = &util::filename_cat($base_dir, $filename);
1094 # Replace %XX's in URL with decoded value if required. Note that the filename may include the %XX in some
1095 # situations. If the *original* file's name was in URL encoding, the following method will not decode it.
1096 my $utf8_filename = $filename;
1097 $filename = $self->opt_url_decode($utf8_filename);
1098
1099 # some special processing if the intended filename was converted to utf8, but
1100 # the actual file still needs to be renamed
1101 if (!-e $filename) {
1102 # try the original filename stored in map
1103 my $original_filename = $self->{'utf8_to_original_filename'}->{$filename};
1104 if (defined $original_filename && -e $original_filename) {
1105 $filename = $original_filename;
1106 }
1107 }
1108
1109 my ($ext) = $filename =~ m/(\.[^\.]*)$/;
1110
1111 if ($rl == 0) {
1112 if ((!defined $ext) || ($ext !~ m/$self->{'assoc_files'}/)) {
1113 return "_httpextlink_&rl=0&el=prompt&href=" . $href . $hash_part;
1114 }
1115 else {
1116 return "_httpextlink_&rl=0&el=direct&href=" . $href . $hash_part;
1117 }
1118 }
1119
1120 if ((!defined $ext) || ($ext !~ m/$self->{'assoc_files'}/)) {
1121 return "_httpextlink_&rl=" . $rl . "&href=" . $href . $hash_part;
1122 }
1123 if ($self->{'rename_assoc_files'}) {
1124 if (defined $self->{'aux_files'}->{$href}) {
1125 $newname = $self->{'aux_files'}->{$href}->{'dir_num'} . "/" .
1126 $self->{'aux_files'}->{$href}->{'file_num'} . $ext;
1127 } else {
1128 $newname = $self->{'dir_num'} . "/" . $self->{'file_num'} . $ext;
1129 $self->{'aux_files'}->{$href} = {'dir_num' => $self->{'dir_num'}, 'file_num' => $self->{'file_num'}};
1130 $self->inc_filecount ();
1131 }
1132 $doc_obj->associate_file($filename, $newname, undef, $section);
1133 return "_httpdocimg_/$newname";
1134 } else {
1135 if(&unicode::is_url_encoded($utf8_filename)) {
1136 # use the possibly-decoded filename instead to avoid double URL encoding
1137 ($newname) = $filename =~ m/([^\/\\]*)$/;
1138 } else {
1139 ($newname) = $utf8_filename =~ m/([^\/\\]*)$/;
1140 }
1141
1142 # Make sure this name uses only ASCII characters.
1143 # We use either base64 or URL encoding, as these preserve original encoding
1144 $newname = &util::rename_file($newname, $self->{'file_rename_method'});
1145
1146 $doc_obj->associate_file($filename, $newname, undef, $section);
1147
1148 # Since the generated image will be URL-encoded to avoid file-system/browser mess-ups
1149 # of filenames, URL-encode the additional percent signs of the URL-encoded filename
1150 my $newname_url = $newname;
1151 $newname_url = &unicode::filename_to_url($newname_url); #$newname_url =~ s/%/%25/g if $newname_url !~ m/%25/;
1152 return "_httpdocimg_/$newname_url";
1153 }
1154}
1155
1156
1157sub format_link {
1158 my $self = shift (@_);
1159 my ($link, $base_dir, $file) = @_;
1160
1161 my ($before_hash, $hash_part) = $link =~ m/^([^\#]*)(\#?.*)$/;
1162
1163 $hash_part = "" if !defined $hash_part;
1164 if (!defined $before_hash || $before_hash !~ m/[\w\.\/]/) {
1165 my $outhandle = $self->{'outhandle'};
1166 print $outhandle "HTMLPlugin: ERROR - badly formatted tag ignored ($link)\n"
1167 if $self->{'verbosity'};
1168 return ($link, "", 0);
1169 }
1170
1171 if ($before_hash =~ s@^((?:http|ftp|file)://)@@i) {
1172 my $type = $1;
1173
1174 if ($link =~ m/^(http|ftp):/i) {
1175 # Turn url (using /) into file name (possibly using \ on windows)
1176 my @http_dir_split = split('/', $before_hash);
1177 $before_hash = &util::filename_cat(@http_dir_split);
1178 }
1179
1180 $before_hash = $self->eval_dir_dots($before_hash);
1181
1182 my $linkfilename = &util::filename_cat ($base_dir, $before_hash);
1183
1184 my $rl = 0;
1185 $rl = 1 if (-e $linkfilename);
1186
1187 # make sure there's a slash on the end if it's a directory
1188 if ($before_hash !~ m/\/$/) {
1189 $before_hash .= "/" if (-d $linkfilename);
1190 }
1191 return ($type . $before_hash, $hash_part, $rl);
1192
1193 } elsif ($link !~ m/^(mailto|news|gopher|nntp|telnet|javascript):/i && $link !~ m/^\//) {
1194
1195 if ($before_hash =~ s@^/@@ || $before_hash =~ m/\\/) {
1196
1197 # the first directory will be the domain name if file_is_url
1198 # to generate archives, otherwise we'll assume all files are
1199 # from the same site and base_dir is the root
1200
1201 if ($self->{'file_is_url'}) {
1202 my @dirs = split /[\/\\]/, $file;
1203 my $domname = shift (@dirs);
1204 $before_hash = &util::filename_cat($domname, $before_hash);
1205 $before_hash =~ s@\\@/@g; # for windows
1206 }
1207 else
1208 {
1209 # see if link shares directory with source document
1210 # => turn into relative link if this is so!
1211
1212 if ($ENV{'GSDLOS'} =~ m/^windows/i) {
1213 # too difficult doing a pattern match with embedded '\'s...
1214 my $win_before_hash=$before_hash;
1215 $win_before_hash =~ s@(\\)+@/@g;
1216 # $base_dir is already similarly "converted" on windows.
1217 if ($win_before_hash =~ s@^$base_dir/@@o) {
1218 # if this is true, we removed a prefix
1219 $before_hash=$win_before_hash;
1220 }
1221 }
1222 else {
1223 # before_hash has lost leading slash by this point,
1224 # -> add back in prior to substitution with $base_dir
1225 $before_hash = "/$before_hash";
1226
1227 $before_hash = &util::filename_cat("",$before_hash);
1228 $before_hash =~ s@^$base_dir/@@;
1229 }
1230 }
1231 } else {
1232 # Turn relative file path into full path
1233 my $dirname = &File::Basename::dirname($file);
1234 $before_hash = &util::filename_cat($dirname, $before_hash);
1235 $before_hash = $self->eval_dir_dots($before_hash);
1236 }
1237
1238 my $linkfilename = &util::filename_cat ($base_dir, $before_hash);
1239 # make sure there's a slash on the end if it's a directory
1240 if ($before_hash !~ m/\/$/) {
1241 $before_hash .= "/" if (-d $linkfilename);
1242 }
1243 return ("http://" . $before_hash, $hash_part, 1);
1244 } else {
1245 # mailto, news, nntp, telnet, javascript or gopher link
1246 return ($before_hash, "", 0);
1247 }
1248}
1249
1250sub extract_first_NNNN_characters {
1251 my $self = shift (@_);
1252 my ($textref, $doc_obj, $thissection) = @_;
1253
1254 foreach my $size (split /,/, $self->{'first'}) {
1255 my $tmptext = $$textref;
1256 # skip to the body
1257 $tmptext =~ s/.*<body[^>]*>//i;
1258 # remove javascript
1259 $tmptext =~ s@<script.*?</script>@ @sig;
1260 $tmptext =~ s/<[^>]*>/ /g;
1261 $tmptext =~ s/&nbsp;/ /g;
1262 $tmptext =~ s/^\s+//;
1263 $tmptext =~ s/\s+$//;
1264 $tmptext =~ s/\s+/ /gs;
1265 $tmptext = &unicode::substr ($tmptext, 0, $size);
1266 $tmptext =~ s/\s\S*$/&#8230;/; # adds an ellipse (...)
1267 $doc_obj->add_utf8_metadata ($thissection, "First$size", $tmptext);
1268 }
1269}
1270
1271
1272sub extract_metadata {
1273 my $self = shift (@_);
1274 my ($textref, $metadata, $doc_obj, $section) = @_;
1275 my $outhandle = $self->{'outhandle'};
1276 # if we don't want metadata, we may as well not be here ...
1277 return if (!defined $self->{'metadata_fields'});
1278
1279 # metadata fields to extract/save. 'key' is the (lowercase) name of the
1280 # html meta, 'value' is the metadata name for greenstone to use
1281 my %find_fields = ();
1282
1283 my %creator_fields = (); # short-cut for lookups
1284
1285
1286 foreach my $field (split /,/, $self->{'metadata_fields'}) {
1287 $field =~ s/^\s+//; # remove leading whitespace
1288 $field =~ s/\s+$//; # remove trailing whitespace
1289
1290 # support tag<tagname>
1291 if ($field =~ m/^(.*?)<(.*?)>$/) {
1292 # "$2" is the user's preferred gs metadata name
1293 $find_fields{lc($1)}=$2; # lc = lowercase
1294 } else { # no <tagname> for mapping
1295 # "$field" is the user's preferred gs metadata name
1296 $find_fields{lc($field)}=$field; # lc = lowercase
1297 }
1298 }
1299
1300 if (defined $self->{'hunt_creator_metadata'} &&
1301 $self->{'hunt_creator_metadata'} == 1 ) {
1302 my @extra_fields =
1303 (
1304 'author',
1305 'author.email',
1306 'creator',
1307 'dc.creator',
1308 'dc.creator.corporatename',
1309 );
1310
1311 # add the creator_metadata fields to search for
1312 foreach my $field (@extra_fields) {
1313 $creator_fields{$field}=0; # add to lookup hash
1314 }
1315 }
1316
1317
1318 # find the header in the html file, which has the meta tags
1319 $$textref =~ m@<head>(.*?)</head>@si;
1320
1321 my $html_header=$1;
1322
1323 # go through every <meta... tag defined in the html and see if it is
1324 # one of the tags we want to match.
1325
1326 # special case for title - we want to remember if its been found
1327 my $found_title = 0;
1328 # this assumes that ">" won't appear. (I don't think it's allowed to...)
1329 $html_header =~ m/^/; # match the start of the string, for \G assertion
1330
1331 while ($html_header =~ m/\G.*?<meta(.*?)>/sig) {
1332 my $metatag=$1;
1333 my ($tag, $value);
1334
1335 # find the tag name
1336 $metatag =~ m/(?:name|http-equiv)\s*=\s*([\"\'])?(.*?)\1/is;
1337 $tag=$2;
1338 # in case they're not using " or ', but they should...
1339 if (! $tag) {
1340 $metatag =~ m/(?:name|http-equiv)\s*=\s*([^\s\>]+)/is;
1341 $tag=$1;
1342 }
1343
1344 if (!defined $tag) {
1345 print $outhandle "HTMLPlugin: can't find NAME in \"$metatag\"\n";
1346 next;
1347 }
1348
1349 # don't need to assign this field if it was passed in from a previous
1350 # (recursive) plugin
1351 if (defined $metadata->{$tag}) {next}
1352
1353 # find the tag content
1354 $metatag =~ m/content\s*=\s*([\"\'])?(.*?)\1/is;
1355 $value=$2;
1356
1357 if (! $value) {
1358 $metatag =~ m/(?:name|http-equiv)\s*=\s*([^\s\>]+)/is;
1359 $value=$1;
1360 }
1361 if (!defined $value) {
1362 print $outhandle "HTMLPlugin: can't find VALUE in \"$metatag\"\n";
1363 next;
1364 }
1365
1366 # clean up and add
1367 $value =~ s/\s+/ /gs;
1368 chomp($value); # remove trailing \n, if any
1369 if (exists $creator_fields{lc($tag)}) {
1370 # map this value onto greenstone's "Creator" metadata
1371 $tag='Creator';
1372 } elsif (!exists $find_fields{lc($tag)}) {
1373 next; # don't want this tag
1374 } else {
1375 # get the user's preferred capitalisation
1376 $tag = $find_fields{lc($tag)};
1377 }
1378 if (lc($tag) eq "title") {
1379 $found_title = 1;
1380 }
1381 print $outhandle " extracted \"$tag\" metadata \"$value\"\n"
1382 if ($self->{'verbosity'} > 2);
1383 if ($tag =~ m/date.*/i){
1384 $tag = lc($tag);
1385 }
1386 $doc_obj->add_utf8_metadata($section, $tag, $value);
1387
1388 }
1389
1390 # TITLE: extract the document title
1391 if (exists $find_fields{'title'} && !$found_title) {
1392 # we want a title, and didn't find one in the meta tags
1393 # see if there's a <title> tag
1394 my $title;
1395 my $from = ""; # for debugging output only
1396 if ($html_header =~ m/<title[^>]*>([^<]+)<\/title[^>]*>/is) {
1397 $title = $1;
1398 $from = "<title> tags";
1399 }
1400
1401 if (!defined $title) {
1402 $from = "first 100 chars";
1403 # if no title use first 100 or so characters
1404 $title = $$textref;
1405 $title =~ s/^\xFE\xFF//; # Remove unicode byte order mark
1406 $title =~ s/^.*?<body>//si;
1407 # ignore javascript!
1408 $title =~ s@<script.*?</script>@ @sig;
1409 $title =~ s/<\/([^>]+)><\1>//g; # (eg) </b><b> - no space
1410 $title =~ s/<[^>]*>/ /g; # remove all HTML tags
1411 $title = substr ($title, 0, 100);
1412 $title =~ s/\s\S*$/.../;
1413 }
1414 $title =~ s/<[^>]*>/ /g; # remove html tags
1415 $title =~ s/&nbsp;/ /g;
1416 $title =~ s/(?:&nbsp;|\xc2\xa0)/ /g; # utf-8 for nbsp...
1417 $title =~ s/\s+/ /gs; # collapse multiple spaces
1418 $title =~ s/^\s*//; # remove leading spaces
1419 $title =~ s/\s*$//; # remove trailing spaces
1420
1421 $title =~ s/^$self->{'title_sub'}// if ($self->{'title_sub'});
1422 $title =~ s/^\s+//s; # in case title_sub introduced any...
1423 $doc_obj->add_utf8_metadata ($section, 'Title', $title);
1424 print $outhandle " extracted Title metadata \"$title\" from $from\n"
1425 if ($self->{'verbosity'} > 2);
1426 }
1427
1428 # add FileFormat metadata
1429 $doc_obj->add_metadata($section,"FileFormat", "HTML");
1430
1431 # Special, for metadata names such as tagH1 - extracts
1432 # the text between the first <H1> and </H1> tags into "H1" metadata.
1433
1434 foreach my $field (keys %find_fields) {
1435 if ($field !~ m/^tag([a-z0-9]+)$/i) {next}
1436 my $tag = $1;
1437 if ($$textref =~ m@<$tag[^>]*>(.*?)</$tag[^>]*>@g) {
1438 my $content = $1;
1439 $content =~ s/&nbsp;/ /g;
1440 $content =~ s/<[^>]*>/ /g;
1441 $content =~ s/^\s+//;
1442 $content =~ s/\s+$//;
1443 $content =~ s/\s+/ /gs;
1444 if ($content) {
1445 $tag=$find_fields{"tag$tag"}; # get the user's capitalisation
1446 $tag =~ s/^tag//i;
1447 $doc_obj->add_utf8_metadata ($section, $tag, $content);
1448 print $outhandle " extracted \"$tag\" metadata \"$content\"\n"
1449 if ($self->{'verbosity'} > 2);
1450 }
1451 }
1452 }
1453}
1454
1455
1456# evaluate any "../" to next directory up
1457# evaluate any "./" as here
1458sub eval_dir_dots {
1459 my $self = shift (@_);
1460 my ($filename) = @_;
1461 my $dirsep_os = &util::get_os_dirsep();
1462 my @dirsep = split(/$dirsep_os/,$filename);
1463
1464 my @eval_dirs = ();
1465 foreach my $d (@dirsep) {
1466 if ($d eq "..") {
1467 pop(@eval_dirs);
1468
1469 } elsif ($d eq ".") {
1470 # do nothing!
1471
1472 } else {
1473 push(@eval_dirs,$d);
1474 }
1475 }
1476
1477 # Need to fiddle with number of elements in @eval_dirs if the
1478 # first one is the empty string. This is because of a
1479 # modification to util::filename_cat that supresses the addition
1480 # of a leading '/' character (or \ if windows) (intended to help
1481 # filename cat with relative paths) if the first entry in the
1482 # array is the empty string. Making the array start with *two*
1483 # empty strings is a way to defeat this "smart" option.
1484 #
1485 if (scalar(@eval_dirs) > 0) {
1486 if ($eval_dirs[0] eq ""){
1487 unshift(@eval_dirs,"");
1488 }
1489 }
1490
1491 my $evaluated_filename = (scalar @eval_dirs > 0) ? &util::filename_cat(@eval_dirs) : "";
1492 return $evaluated_filename;
1493}
1494
1495sub replace_usemap_links {
1496 my $self = shift (@_);
1497 my ($front, $link, $back) = @_;
1498
1499 # remove quotes from link at start and end if necessary
1500 if ($link=~/^[\"\']/) {
1501 $link=~s/^[\"\']//;
1502 $link=~s/[\"\']$//;
1503 $front.='"';
1504 $back="\"$back";
1505 }
1506
1507 $link =~ s/^\.\///;
1508 return $front . $link . $back;
1509}
1510
1511sub inc_filecount {
1512 my $self = shift (@_);
1513
1514 if ($self->{'file_num'} == 1000) {
1515 $self->{'dir_num'} ++;
1516 $self->{'file_num'} = 0;
1517 } else {
1518 $self->{'file_num'} ++;
1519 }
1520}
1521
1522
1523# Extend read_file so that strings like &eacute; are
1524# converted to UTF8 internally.
1525#
1526# We don't convert &lt; or &gt; or &amp; or &quot; in case
1527# they interfere with the GML files
1528
1529sub read_file {
1530 my $self = shift(@_);
1531 my ($filename, $encoding, $language, $textref) = @_;
1532
1533 $self->SUPER::read_file($filename, $encoding, $language, $textref);
1534
1535 # Convert entities to their UTF8 equivalents
1536 $$textref =~ s/&(lt|gt|amp|quot|nbsp);/&z$1;/go;
1537 $$textref =~ s/&([^;]+);/&ghtml::getcharequiv($1,1)/gseo;
1538 $$textref =~ s/&z(lt|gt|amp|quot|nbsp);/&$1;/go;
1539}
1540
15411;
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