source: gsdl/trunk/perllib/plugins/BasePlugin.pm@ 20605

Last change on this file since 20605 was 20605, checked in by kjdon, 15 years ago

check OIDmetadata defined before modifying it - it may not be defined when initializing on-the-side plugin helpers, where argument parsing is not done
  • Property svn:keywords set to Author Date Id Revision
File size: 35.3 KB
Line 
1###########################################################################
2#
3# BasePlugin.pm -- base class for all the import plugins
4# A component of the Greenstone digital library software
5# from the New Zealand Digital Library Project at the
6# University of Waikato, New Zealand.
7#
8# Copyright (C) 1999-2005 New Zealand Digital Library Project
9#
10# This program is free software; you can redistribute it and/or modify
11# it under the terms of the GNU General Public License as published by
12# the Free Software Foundation; either version 2 of the License, or
13# (at your option) any later version.
14#
15# This program is distributed in the hope that it will be useful,
16# but WITHOUT ANY WARRANTY; without even the implied warranty of
17# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18# GNU General Public License for more details.
19#
20# You should have received a copy of the GNU General Public License
21# along with this program; if not, write to the Free Software
22# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23#
24###########################################################################
25
26package BasePlugin;
27
28use strict;
29no strict 'subs';
30no strict 'refs'; # allow filehandles to be variables and viceversa
31
32use File::Basename;
33
34use encodings;
35use unicode;
36use textcat;
37use doc;
38use ghtml;
39use gsprintf 'gsprintf';
40
41use PrintInfo;
42
43BEGIN {
44 @BasePlugin::ISA = ( 'PrintInfo' );
45}
46
47# the different methods that can be applied when renaming
48# imported documents and their associated files
49our $file_rename_method_list =
50 [ { 'name' => "url",
51 'desc' => "{BasePlugin.rename_method.url}" },
52 { 'name' => "base64",
53 'desc' => "{BasePlugin.rename_method.base64}" },
54 { 'name' => "none",
55 'desc' => "{BasePlugin.rename_method.none}",
56 'hiddengli' => "yes" } ];
57
58our $encoding_list =
59 [ { 'name' => "ascii",
60 'desc' => "{BasePlugin.encoding.ascii}" },
61 { 'name' => "utf8",
62 'desc' => "{BasePlugin.encoding.utf8}" },
63 { 'name' => "unicode",
64 'desc' => "{BasePlugin.encoding.unicode}" } ];
65
66
67my $e = $encodings::encodings;
68foreach my $enc (sort {$e->{$a}->{'name'} cmp $e->{$b}->{'name'}} keys (%$e))
69{
70 my $hashEncode =
71 {'name' => $enc,
72 'desc' => $e->{$enc}->{'name'}};
73
74 push(@{$encoding_list},$hashEncode);
75}
76
77our $encoding_plus_auto_list =
78 [ { 'name' => "auto",
79 'desc' => "{BasePlugin.filename_encoding.auto}" },
80 { 'name' => "auto-language-analysis",
81 'desc' => "{BasePlugin.filename_encoding.auto_language_analysis}" }, # textcat
82 { 'name' => "auto-filesystem-encoding",
83 'desc' => "{BasePlugin.filename_encoding.auto_filesystem_encoding}" }, # locale
84 { 'name' => "auto-fl",
85 'desc' => "{BasePlugin.filename_encoding.auto_fl}" }, # locale followed by textcat
86 { 'name' => "auto-lf",
87 'desc' => "{BasePlugin.filename_encoding.auto_lf}" } ]; # texcat followed by locale
88
89push(@{$encoding_plus_auto_list},@{$encoding_list});
90
91our $oidtype_list =
92 [ { 'name' => "auto",
93 'desc' => "{BasePlugin.OIDtype.auto}" },
94 { 'name' => "hash",
95 'desc' => "{import.OIDtype.hash}" },
96 { 'name' => "assigned",
97 'desc' => "{import.OIDtype.assigned}" },
98 { 'name' => "incremental",
99 'desc' => "{import.OIDtype.incremental}" },
100 { 'name' => "dirname",
101 'desc' => "{import.OIDtype.dirname}" } ];
102
103my $arguments =
104 [ { 'name' => "process_exp",
105 'desc' => "{BasePlugin.process_exp}",
106 'type' => "regexp",
107 'deft' => "",
108 'reqd' => "no" },
109 { 'name' => "no_blocking",
110 'desc' => "{BasePlugin.no_blocking}",
111 'type' => "flag",
112 'reqd' => "no"},
113 { 'name' => "block_exp",
114 'desc' => "{BasePlugin.block_exp}",
115 'type' => "regexp",
116 'deft' => "",
117 'reqd' => "no" },
118 { 'name' => "associate_ext",
119 'desc' => "{BasePlugin.associate_ext}",
120 'type' => "string",
121 'reqd' => "no" },
122 { 'name' => "associate_tail_re",
123 'desc' => "{BasePlugin.associate_tail_re}",
124 'type' => "string",
125 'reqd' => "no" },
126 { 'name' => "OIDtype",
127 'desc' => "{import.OIDtype}",
128 'type' => "enum",
129 'list' => $oidtype_list,
130 # leave default empty so we can tell if its been set or not - if not set will use option from import.pl
131 'deft' => "auto",
132 'reqd' => "no" },
133 { 'name' => "OIDmetadata",
134 'desc' => "{import.OIDmetadata}",
135 'type' => "metadata",
136 'deft' => "dc.Identifier",
137 'reqd' => "no" },
138# { 'name' => "use_as_doc_identifier",
139# 'desc' => "{BasePlugin.use_as_doc_identifier}",
140# 'type' => "string",
141# 'reqd' => "no" ,
142# 'deft' => "" } ,
143 { 'name' => "no_cover_image",
144 'desc' => "{BasePlugin.no_cover_image}",
145 'type' => "flag",
146 'reqd' => "no" },
147 { 'name' => "filename_encoding",
148 'desc' => "{BasePlugin.filename_encoding}",
149 'type' => "enum",
150 'deft' => "auto",
151 'list' => $encoding_plus_auto_list,
152 'reqd' => "no" },
153 { 'name' => "smart_block",
154 'desc' => "{common.deprecated}. {BasePlugin.smart_block}",
155 'type' => "flag",
156 'reqd' => "no",
157 'hiddengli' => "yes" }, # deprecated, but leave in for old collections
158 { 'name' => "file_rename_method",
159 'desc' => "{BasePlugin.file_rename_method}",
160 'type' => "enum",
161 'deft' => &get_default_file_rename_method(), # by default rename imported files and assoc files using this encoding
162 'list' => $file_rename_method_list,
163 'reqd' => "no"
164 }
165
166 ];
167
168
169my $options = { 'name' => "BasePlugin",
170 'desc' => "{BasePlugin.desc}",
171 'abstract' => "yes",
172 'inherits' => "no",
173 'args' => $arguments };
174
175sub new {
176
177 my ($class) = shift (@_);
178 my ($pluginlist,$inputargs,$hashArgOptLists,$auxiliary) = @_;
179 push(@$pluginlist, $class);
180
181 push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
182 push(@{$hashArgOptLists->{"OptList"}},$options);
183
184 my $self = new PrintInfo($pluginlist, $inputargs, $hashArgOptLists,$auxiliary);
185
186 if ($self->{'info_only'}) {
187 # don't worry about any options etc
188 return bless $self, $class;
189 }
190
191 if ($self->{'smart_block'}) {
192 print STDERR "WARNING: -smart_block option has been deprecated and is no longer useful\n";
193 }
194 $self->{'smart_block'} = undef;
195
196 my $plugin_name = (defined $pluginlist->[0]) ? $pluginlist->[0] : $class;
197 $self->{'plugin_type'} = $plugin_name;
198
199 # remove ex. from OIDmetadata
200 $self->{'OIDmetadata'} =~ s/^ex\.// if defined $self->{'OIDmetadata'};
201 $self->{'num_processed'} = 0;
202 $self->{'num_not_processed'} = 0;
203 $self->{'num_blocked'} = 0;
204 $self->{'num_archives'} = 0;
205 $self->{'cover_image'} = 1; # cover image is on by default
206 $self->{'cover_image'} = 0 if ($self->{'no_cover_image'});
207 $self->{'can_process_directories'} = 0;
208 #$self->{'option_list'} = $hashArgOptLists->{"OptList"};
209
210 my $associate_ext = $self->{'associate_ext'};
211 if ((defined $associate_ext) && ($associate_ext ne "")) {
212
213 my $associate_tail_re = $self->{'associate_tail_re'};
214 if ((defined $associate_tail_re) && ($associate_tail_re ne "")) {
215 my $outhandle = $self->{'outhandle'};
216 print $outhandle "Warning: can only specify 'associate_ext' or 'associate_tail_re'\n";
217 print $outhandle " defaulting to 'associate_tail_re'\n";
218 }
219 else {
220 my @exts = split(/,/,$associate_ext);
221
222 my @exts_bracketed = map { $_ = "(?:\\.$_)" } @exts;
223 my $associate_tail_re = join("|",@exts_bracketed);
224 $self->{'associate_tail_re'} = $associate_tail_re;
225 }
226
227 delete $self->{'associate_ext'};
228 }
229
230 return bless $self, $class;
231
232}
233
234sub merge_inheritance
235{
236 my $self = {};
237 my @child_selfs = @_;
238
239 foreach my $child_self (@child_selfs) {
240 foreach my $key (keys %$child_self) {
241 if (defined $self->{$key}) {
242 if ($self->{$key} ne $child_self->{$key}) {
243# print STDERR "Warning: Conflicting value in multiple inheritance for '$key'\n";
244# print STDERR "Existing stored value = $self->{$key}\n";
245# print STDERR "New (child) value = $child_self->{$key}\n";
246# print STDERR "Keeping existing value\n";
247 # Existing value seems to be option specified in collect.cfg
248
249 ### $self->{$key} = $child_self->{$key};
250
251 }
252 else {
253## print STDERR "****Info: Value $self->{$key} for $key already defined through multiple inheritance as the same value\n";
254 }
255
256 }
257 else {
258 $self->{$key} = $child_self->{$key};
259 }
260 }
261 }
262
263 return $self;
264}
265
266# initialize BasePlugin options
267# if init() is overridden in a sub-class, remember to call BasePlugin::init()
268sub init {
269 my $self = shift (@_);
270 my ($verbosity, $outhandle, $failhandle) = @_;
271
272 # verbosity is passed through from the processor
273 $self->{'verbosity'} = $verbosity;
274
275 # as are the outhandle and failhandle
276 $self->{'outhandle'} = $outhandle if defined $outhandle;
277 $self->{'failhandle'} = $failhandle;
278# $self->SUPER::init(@_);
279
280 # set process_exp and block_exp to defaults unless they were
281 # explicitly set
282
283 if ((!$self->is_recursive()) and
284 (!defined $self->{'process_exp'}) || ($self->{'process_exp'} eq "")) {
285
286 $self->{'process_exp'} = $self->get_default_process_exp ();
287 if ($self->{'process_exp'} eq "") {
288 warn ref($self) . " Warning: Non-recursive plugin has no process_exp\n";
289 }
290 }
291
292 if ((!defined $self->{'block_exp'}) || ($self->{'block_exp'} eq "")) {
293 $self->{'block_exp'} = $self->get_default_block_exp ();
294 }
295
296}
297
298sub begin {
299 my $self = shift (@_);
300 my ($pluginfo, $base_dir, $processor, $maxdocs) = @_;
301
302 if ($self->{'OIDtype'} eq "auto") {
303 # hasn't been set in the plugin, use the processor values
304 $self->{'OIDtype'} = $processor->{'OIDtype'};
305 $self->{'OIDmetadata'} = $processor->{'OIDmetadata'};
306 }
307 if ($self->{'OIDtype'} eq "hash") {
308 # should we hash on the file or on the doc xml??
309 $self->{'OIDtype'} = $self->get_oid_hash_type();
310 if ($self->{'OIDtype'} !~ /^(hash_on_file|hash_on_ga_xml)$/) {
311 $self->{'OIDtype'} = "hash_on_file";
312 }
313 }
314}
315
316sub end {
317 # potentially called at the end of each plugin pass
318 # import.pl only has one plugin pass, but buildcol.pl has multiple ones
319
320 my ($self) = shift (@_);
321}
322
323sub deinit {
324 # called only once, after all plugin passes have been done
325
326 my ($self) = @_;
327}
328
329# default hashing type is to hash on the original file (or converted file)
330# override this to return hash_on_ga_xml for filetypes where hashing on the
331# file is no good eg video
332sub get_oid_hash_type {
333
334 my $self = shift (@_);
335
336 return "hash_on_file";
337}
338
339
340# this function should be overridden to return 1
341# in recursive plugins
342sub is_recursive {
343 my $self = shift (@_);
344
345 return 0;
346}
347
348sub get_default_block_exp {
349 my $self = shift (@_);
350
351 return "";
352}
353
354sub get_default_process_exp {
355 my $self = shift (@_);
356
357 return "";
358}
359
360# rename imported files and assoc files using URL encoding by default
361# as this will work for most plugins and give more legible filenames
362sub get_default_file_rename_method() {
363 my $self = shift (@_);
364 return "url";
365}
366
367# returns this plugin's active (possibly user-selected) file_rename_method
368sub get_file_rename_method() {
369 my $self = shift (@_);
370 my $rename_method = $self->{'file_rename_method'};
371 if($rename_method) {
372 return $rename_method;
373 } else {
374 return $self->get_default_file_rename_method();
375 }
376}
377
378# default implementation is to do nothing
379sub store_block_files {
380
381 my $self =shift (@_);
382 my ($filename_full_path, $block_hash) = @_;
383
384}
385
386# put files to block into hash
387sub use_block_expressions {
388
389 my $self =shift (@_);
390 my ($filename_full_path, $block_hash) = @_;
391
392 if ($self->{'block_exp'} ne "" && $filename_full_path =~ /$self->{'block_exp'}/) {
393 $block_hash->{'file_blocks'}->{$filename_full_path} = 1;
394 }
395
396}
397
398#default implementation is to block a file with same name as this, but extension jpg or JPG, if cover_images is on.
399sub block_cover_image
400{
401 my $self =shift;
402 my ($filename, $block_hash) = @_;
403
404 if ($self->{'cover_image'}) {
405 my $coverfile = $filename;
406 $coverfile =~ s/\.[^\\\/\.]+$/\.jpg/;
407 if (!-e $coverfile) {
408 $coverfile =~ s/jpg$/JPG/;
409 }
410 if (-e $coverfile) {
411 $block_hash->{'file_blocks'}->{$coverfile} = 1;
412 }
413 }
414
415 return;
416}
417
418
419# discover all the files that should be blocked by this plugin
420# check the args ...
421sub file_block_read {
422
423 my $self = shift (@_);
424 my ($pluginfo, $base_dir, $file, $block_hash, $metadata, $gli) = @_;
425 # Keep track of filenames with same root but different extensions
426 # Used to support -associate_ext and the more generalised
427 # -associate_tail_re
428 my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);
429
430 if (!-d $filename_full_path) {
431 $block_hash->{'all_files'}->{$file} = 1;
432 }
433
434 my $associate_tail_re = $self->{'associate_tail_re'};
435 if ((defined $associate_tail_re) && ($associate_tail_re ne "")) {
436 my ($file_prefix,$file_ext)
437 = &util::get_prefix_and_tail_by_regex($filename_full_path,$associate_tail_re);
438 if ((defined $file_prefix) && (defined $file_ext)) {
439 my $shared_fileroot = $block_hash->{'shared_fileroot'};
440 if (!defined $shared_fileroot->{$file_prefix}) {
441 my $file_prefix_rec = { 'tie_to' => undef,
442 'exts' => {} };
443 $shared_fileroot->{$file_prefix} = $file_prefix_rec;
444 }
445
446 my $file_prefix_rec = $shared_fileroot->{$file_prefix};
447
448 if ($self->can_process_this_file($filename_full_path)) {
449 # This is the document the others should be tied to
450 $file_prefix_rec->{'tie_to'} = $file_ext;
451 }
452 else {
453 if ($file_ext =~ m/$associate_tail_re$/) {
454 # this file should be associated to the main one
455 $file_prefix_rec->{'exts'}->{$file_ext} = 1;
456 }
457 }
458
459 }
460 }
461
462 # check block expressions
463 $self->use_block_expressions($filename_full_path, $block_hash) unless $self->{'no_blocking'};
464
465 # now check whether we are actually processing this
466 if (!-f $filename_full_path || !$self->can_process_this_file($filename_full_path)) {
467 return undef; # can't recognise
468 }
469
470 # if we have a block_exp, then this overrides the normal 'smart' blocking
471 $self->store_block_files($filename_full_path, $block_hash) unless ($self->{'no_blocking'} || $self->{'block_exp'} ne "");
472
473 # block the cover image if there is one
474 if ($self->{'cover_image'}) {
475 $self->block_cover_image($filename_full_path, $block_hash);
476 }
477
478 return 1;
479}
480
481# plugins that rely on more than process_exp (eg XML plugins) can override this method
482sub can_process_this_file {
483 my $self = shift(@_);
484 my ($filename) = @_;
485
486 if (-d $filename && !$self->{'can_process_directories'}) {
487 return 0;
488 }
489 if ($self->{'process_exp'} ne "" && $filename =~ /$self->{'process_exp'}/) {
490 return 1;
491 }
492 return 0;
493
494}
495
496# just converts path as is to utf8.
497sub filepath_to_utf8 {
498 my $self = shift (@_);
499 my ($file, $file_encoding) = @_;
500 my $filemeta = $file;
501
502 my $filename_encoding = $self->{'filename_encoding'}; # filename encoding setting
503
504 # Whenever filename-encoding is set to any of the auto settings, we
505 # check if the filename is already in UTF8. If it is, then we're done.
506 if($filename_encoding =~ m/auto/) {
507 if(&unicode::check_is_utf8($filemeta))
508 {
509 $filename_encoding = "utf8";
510 return $filemeta;
511 }
512 }
513
514 # Auto setting, but filename is not utf8
515 if ($filename_encoding eq "auto")
516 {
517 # try textcat
518 $filename_encoding = $self->textcat_encoding($filemeta);
519
520 # check the locale next
521 $filename_encoding = $self->locale_encoding() if $filename_encoding eq "undefined";
522
523
524 # now try the encoding of the document, if available
525 if ($filename_encoding eq "undefined" && defined $file_encoding) {
526 $filename_encoding = $file_encoding;
527 }
528
529 }
530
531 elsif ($filename_encoding eq "auto-language-analysis")
532 {
533 $filename_encoding = $self->textcat_encoding($filemeta);
534
535 # now try the encoding of the document, if available
536 if ($filename_encoding eq "undefined" && defined $file_encoding) {
537 $filename_encoding = $file_encoding;
538 }
539 }
540
541 elsif ($filename_encoding eq "auto-filesystem-encoding")
542 {
543 # try locale
544 $filename_encoding = $self->locale_encoding();
545 }
546
547 elsif ($filename_encoding eq "auto-fl")
548 {
549 # filesystem-encoding (locale) then language-analysis (textcat)
550 $filename_encoding = $self->locale_encoding();
551
552 # try textcat
553 $filename_encoding = $self->textcat_encoding($filemeta) if $filename_encoding eq "undefined";
554
555 # else assume filename encoding is encoding of file content, if that's available
556 if ($filename_encoding eq "undefined" && defined $file_encoding) {
557 $filename_encoding = $file_encoding;
558 }
559 }
560
561 elsif ($filename_encoding eq "auto-lf")
562 {
563 # language-analysis (textcat) then filesystem-encoding (locale)
564 $filename_encoding = $self->textcat_encoding($filemeta);
565
566 # guess filename encoding from encoding of file content, if available
567 if ($filename_encoding eq "undefined" && defined $file_encoding) {
568 $filename_encoding = $file_encoding;
569 }
570
571 # try locale
572 $filename_encoding = $self->locale_encoding() if $filename_encoding eq "undefined";
573 }
574
575 # if still undefined, use utf8 as fallback
576 if ($filename_encoding eq "undefined") {
577 $filename_encoding = "utf8";
578 }
579
580 #print STDERR "**** UTF8 encoding the filename $filemeta ";
581
582 # if the filename encoding is set to utf8 but it isn't utf8 already--such as when
583 # 1. the utf8 fallback is used, or 2. if the system locale is used and happens to
584 # be always utf8 (in which case the filename's encoding is also set as utf8 even
585 # though the filename need not be if it originates from another system)--in such
586 # cases attempt to make the filename utf8 to match.
587 if($filename_encoding eq "utf8" && !&unicode::check_is_utf8($filemeta)) {
588 &unicode::ensure_utf8(\$filemeta);
589 }
590
591 # convert non-unicode encodings to utf8
592 if ($filename_encoding !~ m/(?:ascii|utf8|unicode)/) {
593 $filemeta = &unicode::unicode2utf8(
594 &unicode::convert2unicode($filename_encoding, \$filemeta)
595 );
596 }
597
598 #print STDERR " from encoding $filename_encoding -> $filemeta\n";
599 return $filemeta;
600}
601
602# gets the filename with no path, converts to utf8, and then dm safes it.
603# filename_encoding set by user
604sub filename_to_utf8_metadata
605{
606 my $self = shift (@_);
607 my ($file, $file_encoding) = @_;
608
609 my $outhandle = $self->{'outhandle'};
610
611 my ($filemeta) = $file =~ /([^\\\/]+)$/; # getting the tail of the filepath (skips all string parts containing slashes upto the end)
612 $filemeta = $self->filepath_to_utf8($filemeta, $file_encoding);
613
614 my $dmsafe_filemeta = &ghtml::dmsafe($filemeta);
615
616 return $dmsafe_filemeta;
617
618}
619
620sub locale_encoding {
621 my $self = shift(@_);
622
623 if (!defined $self->{'filesystem_encoding'}) {
624 $self->{'filesystem_encoding'} = $self->get_filesystem_encoding();
625 $self->{'filesystem_encoding'} = "undefined" if !defined $self->{'filesystem_encoding'};
626 }
627
628 #print STDERR "*** filename encoding determined based on locale: " . $self->{'filesystem_encoding'} . "\n";
629 return $self->{'filesystem_encoding'}; # can be the string "undefined"
630}
631
632sub textcat_encoding {
633 my $self = shift(@_);
634 my ($filemeta) = @_;
635
636 # analyse filenames without extensions and digits (and trimmed of surrounding
637 # whitespace), so that irrelevant chars don't confuse textcat
638 my $strictfilemeta = $filemeta;
639 $strictfilemeta =~ s/\.[^\.]+$//g;
640 $strictfilemeta =~ s/\d//g;
641 $strictfilemeta =~ s/^\s*//g;
642 $strictfilemeta =~ s/\s*$//g;
643
644 my $filename_encoding = $self->encoding_from_language_analysis($strictfilemeta);
645 if(!defined $filename_encoding) {
646 $filename_encoding = "undefined";
647 }
648
649 return $filename_encoding; # can be the string "undefined"
650}
651
652# performs textcat
653sub encoding_from_language_analysis {
654 my $self = shift(@_);
655 my ($text) = @_;
656
657 my $outhandle = $self->{'outhandle'};
658 my $best_encoding = undef;
659
660 # get the language/encoding of the textstring using textcat
661 $self->{'textcat'} = new textcat() unless defined($self->{'textcat'});
662 my $results = $self->{'textcat'}->classify_cached_filename(\$text);
663
664
665 if (scalar @$results < 0) {
666 return undef;
667 }
668
669 # We have some results, we choose the first
670 my ($language, $encoding) = $results->[0] =~ /^([^-]*)(?:-(.*))?$/;
671
672 $best_encoding = $encoding;
673 if (!defined $best_encoding) {
674 return undef;
675 }
676
677 if (defined $best_encoding && $best_encoding =~ m/^iso_8859/ && &unicode::check_is_utf8($text)) {
678 # the text is valid utf8, so assume that's the real encoding (since textcat is based on probabilities)
679 $best_encoding = 'utf8';
680 }
681
682
683 # check for equivalents where textcat doesn't have some encodings...
684 # eg MS versions of standard encodings
685 if (defined $best_encoding && $best_encoding =~ /^iso_8859_(\d+)/) {
686 my $iso = $1; # which variant of the iso standard?
687 # iso-8859 sets don't use chars 0x80-0x9f, windows codepages do
688 if ($text =~ /[\x80-\x9f]/) {
689 # Western Europe
690 if ($iso == 1 or $iso == 15) { $best_encoding = 'windows_1252' }
691 elsif ($iso == 2) {$best_encoding = 'windows_1250'} # Central Europe
692 elsif ($iso == 5) {$best_encoding = 'windows_1251'} # Cyrillic
693 elsif ($iso == 6) {$best_encoding = 'windows_1256'} # Arabic
694 elsif ($iso == 7) {$best_encoding = 'windows_1253'} # Greek
695 elsif ($iso == 8) {$best_encoding = 'windows_1255'} # Hebrew
696 elsif ($iso == 9) {$best_encoding = 'windows_1254'} # Turkish
697 }
698 }
699
700 if (defined $best_encoding && $best_encoding !~ /^(ascii|utf8|unicode)$/ &&
701 !defined $encodings::encodings->{$best_encoding})
702 {
703 if ($self->{'verbosity'}) {
704 gsprintf($outhandle, "BasePlugin: {ReadTextFile.unsupported_encoding}\n", $text, $best_encoding, "undef");
705 }
706 $best_encoding = undef;
707 }
708
709 return $best_encoding;
710}
711
712# uses locale
713sub get_filesystem_encoding {
714
715 my $self = shift(@_);
716
717 my $outhandle = $self->{'outhandle'};
718 my $filesystem_encoding = undef;
719
720 eval {
721 use POSIX qw(locale_h);
722
723 # With only one parameter, setlocale retrieves the
724 # current value
725 my $current_locale = setlocale(LC_CTYPE);
726
727 if ($current_locale =~ m/^.*\.(.*?)$/) {
728 my $char_encoding = lc($1);
729 if ($char_encoding =~ m/^(iso)(8859)(\d{1,2})$/) {
730 $char_encoding = "$1\_$2\_$3";
731 }
732
733 $char_encoding =~ s/-/_/g;
734 $char_encoding =~ s/^utf_8$/utf8/;
735
736 if ($char_encoding =~ m/^\d+$/) {
737 if (defined $encodings::encodings->{"windows_$char_encoding"}) {
738 $char_encoding = "windows_$char_encoding";
739 }
740 elsif (defined $encodings::encodings->{"dos_$char_encoding"}) {
741 $char_encoding = "dos_$char_encoding";
742 }
743 }
744
745 if (($char_encoding =~ m/(?:ascii|utf8|unicode)/)
746 || (defined $encodings::encodings->{$char_encoding})) {
747 $filesystem_encoding = $char_encoding;
748 }
749 else {
750 print $outhandle "Warning: Unsupported character encoding '$char_encoding' from locale '$current_locale'\n";
751 }
752 }
753
754
755 };
756 if ($@) {
757 print $outhandle "$@\n";
758 print $outhandle "Warning: Unable to establish locale. Will assume filesystem is UTF-8\n";
759
760 }
761 return $filesystem_encoding;
762}
763
764# is there ever only one Source? Sometimes this will be called twice, for images etc that are converted.
765sub set_Source_metadata {
766 my $self = shift (@_);
767 my ($doc_obj, $filename_no_path, $file_encoding) = @_;
768
769 my $top_section = $doc_obj->get_top_section();
770
771 # UTF-8 version of filename
772 my $filemeta = $self->filename_to_utf8_metadata($filename_no_path, $file_encoding);
773
774 # Source is the UTF8 display name - not necessarily the name of the file on the system
775 $doc_obj->set_utf8_metadata_element($top_section, "Source", $filemeta);
776
777 $filemeta = &util::rename_file($filemeta, $self->{'file_rename_method'});
778 # If using URL encoding, then SourceFile is the url-reference to url-encoded
779 # filemeta: it's a url that refers to the actual file on the system
780 $filemeta = &unicode::filename_to_url($filemeta);
781
782 $doc_obj->set_utf8_metadata_element($top_section, "SourceFile", $filemeta);
783}
784
785# this should be called by all plugins to set the oid of the doc obj, rather
786# than calling doc_obj->set_OID directly
787sub add_OID {
788 my $self = shift (@_);
789 my ($doc_obj) = @_;
790
791 $doc_obj->set_OIDtype($self->{'OIDtype'}, $self->{'OIDmetadata'});
792
793 # see if there is a plugin specific set_OID function
794 if (defined ($self->can('set_OID'))) {
795 $self->set_OID(@_); # pass through doc_obj and any extra arguments
796 }
797 else {
798 # use the default set_OID() in doc.pm
799 $doc_obj->set_OID();
800 }
801
802}
803
804# The BasePlugin read_into_doc_obj() function. This function does all the
805# right things to make general options work for a given plugin. It doesn't do anything with the file other than setting reads in
806# a file and sets up a slew of metadata all saved in doc_obj, which
807# it then returns as part of a tuple (process_status,doc_obj)
808#
809# Much of this functionality used to reside in read, but it was broken
810# down into a supporting routine to make the code more flexible.
811#
812# recursive plugins (e.g. RecPlug) and specialized plugins like those
813# capable of processing many documents within a single file (e.g.
814# GMLPlug) will normally want to implement their own version of
815# read_into_doc_obj()
816#
817# Note that $base_dir might be "" and that $file might
818# include directories
819
820# currently blocking has been done before it gets here - does this affect secondary plugin stuff??
821sub read_into_doc_obj {
822 my $self = shift (@_);
823 my ($pluginfo, $base_dir, $file, $block_hash, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
824
825 my $outhandle = $self->{'outhandle'};
826
827 # should we move this to read? What about secondary plugins?
828 print STDERR "<Processing n='$file' p='$self->{'plugin_type'}'>\n" if ($gli);
829 print $outhandle "$self->{'plugin_type'} processing $file\n"
830 if $self->{'verbosity'} > 1;
831
832 my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);
833
834 # create a new document
835 my $doc_obj = new doc ($filename_full_path, "indexed_doc", $self->{'file_rename_method'});
836 my $top_section = $doc_obj->get_top_section();
837
838 $doc_obj->add_utf8_metadata($top_section, "Plugin", "$self->{'plugin_type'}");
839 $doc_obj->add_utf8_metadata($top_section, "FileSize", (-s $filename_full_path));
840
841
842 # sets the UTF8 filename (Source) for display and sets the url ref to URL encoded version
843 # of the UTF8 filename (SourceFile) for generated files
844 $self->set_Source_metadata($doc_obj, $filename_no_path);
845
846
847 # plugin specific stuff - what args do we need here??
848 unless (defined ($self->process($pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli))) {
849 print STDERR "<ProcessingError n='$file'>\n" if ($gli);
850 return -1;
851 }
852
853 # include any metadata passed in from previous plugins
854 # note that this metadata is associated with the top level section
855 my $section = $doc_obj->get_top_section();
856 # can we merge these two methods??
857 $self->add_associated_files($doc_obj, $filename_full_path);
858 $self->extra_metadata ($doc_obj, $section, $metadata);
859 $self->auto_extract_metadata($doc_obj);
860
861 # if we haven't found any Title so far, assign one
862 # this was shifted to here from inside read()
863 $self->title_fallback($doc_obj,$section,$filename_no_path);
864
865 $self->add_OID($doc_obj);
866
867 return (1,$doc_obj);
868}
869
870sub add_dummy_text {
871 my $self = shift(@_);
872 my ($doc_obj, $section) = @_;
873
874 # add NoText metadata so we can hide this dummy text in format statements
875 $doc_obj->add_metadata($section, "NoText", "1");
876 $doc_obj->add_text($section, &gsprintf::lookup_string("{BasePlugin.dummy_text}",1));
877
878}
879
880# does nothing. Can be overridden by subclass
881sub auto_extract_metadata {
882 my $self = shift(@_);
883 my ($doc_obj) = @_;
884}
885
886# adds cover image, associate_file options stuff. Should be called by sub class
887# read_into_doc_obj
888sub add_associated_files {
889 my $self = shift(@_);
890 # whatis filename??
891 my ($doc_obj, $filename) = @_;
892
893 # add in the cover image
894 if ($self->{'cover_image'}) {
895 $self->associate_cover_image($doc_obj, $filename);
896 }
897
898
899}
900
901# implement this if you are extracting metadata for other documents
902sub metadata_read {
903 my $self = shift (@_);
904 my ($pluginfo, $base_dir, $file, $block_hash,
905 $extrametakeys, $extrametadata, $extrametafile,
906 $processor, $maxdocs, $gli) = @_;
907
908 # can we process this file??
909 my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);
910 return undef unless $self->can_process_this_file($filename_full_path);
911
912 return 1; # we recognise the file, but don't actually do anything with it
913}
914
915
916# The BasePlugin read() function. This function calls read_into_doc_obj()
917# to ensure all the right things to make general options work for a
918# given plugin are done. It then calls the process() function which
919# does all the work specific to a plugin (like the old read functions
920# used to do). Most plugins should define their own process() function
921# and let this read() function keep control.
922#
923# recursive plugins (e.g. RecPlug) and specialized plugins like those
924# capable of processing many documents within a single file (e.g.
925# GMLPlug) might want to implement their own version of read(), but
926# more likely need to implement their own version of read_into_doc_obj()
927#
928# Return number of files processed, undef if can't recognise, -1 if can't
929# process
930
931sub read {
932 my $self = shift (@_);
933 my ($pluginfo, $base_dir, $file, $block_hash, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
934
935 # can we process this file??
936 my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);
937
938 return undef unless $self->can_process_this_file($filename_full_path);
939
940 my ($process_status,$doc_obj) = $self->read_into_doc_obj(@_);
941
942 if ((defined $process_status) && ($process_status == 1)) {
943
944 # process the document
945 $processor->process($doc_obj);
946
947 $self->{'num_processed'} ++;
948 undef $doc_obj;
949 }
950 # delete any temp files that we may have created
951 $self->clean_up_after_doc_obj_processing();
952
953
954 # if process_status == 1, then the file has been processed.
955 return $process_status;
956
957}
958
959# returns undef if file is rejected by the plugin
960sub process {
961 my $self = shift (@_);
962 my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
963
964 gsprintf(STDERR, "BasePlugin::process {common.must_be_implemented}\n") && die "\n";
965
966 return undef; # never gets here
967}
968
969# overwrite this method to delete any temp files that we have created
970sub clean_up_after_doc_obj_processing {
971 my $self = shift(@_);
972
973}
974
975# write_file -- used by ConvertToPlug, for example in post processing
976#
977# where should this go, is here the best place??
978sub utf8_write_file {
979 my $self = shift (@_);
980 my ($textref, $filename) = @_;
981
982 if (!open (FILE, ">$filename")) {
983 gsprintf(STDERR, "ConvertToPlug::write_file {ConvertToPlug.could_not_open_for_writing} ($!)\n", $filename);
984 die "\n";
985 }
986 print FILE $$textref;
987
988 close FILE;
989}
990
991
992sub filename_based_title
993{
994 my $self = shift (@_);
995 my ($file) = @_;
996
997 my $file_derived_title = $file;
998 $file_derived_title =~ s/_/ /g;
999 $file_derived_title =~ s/\..*?$//;
1000
1001 return $file_derived_title;
1002}
1003
1004
1005sub title_fallback
1006{
1007 my $self = shift (@_);
1008 my ($doc_obj,$section,$file) = @_;
1009
1010 if (!defined $doc_obj->get_metadata_element ($section, "Title") or $doc_obj->get_metadata_element($section, "Title") eq "") {
1011
1012 my $file_derived_title = $self->filename_to_utf8_metadata($self->filename_based_title($file));
1013 if (!defined $doc_obj->get_metadata_element ($section, "Title")) {
1014 $doc_obj->add_utf8_metadata ($section, "Title", $file_derived_title);
1015 }
1016 else {
1017 $doc_obj->set_utf8_metadata_element ($section, "Title", $file_derived_title);
1018 }
1019 }
1020
1021}
1022
1023# add any extra metadata that's been passed around from one
1024# plugin to another.
1025# extra_metadata uses add_utf8_metadata so it expects metadata values
1026# to already be in utf8
1027sub extra_metadata {
1028 my $self = shift (@_);
1029 my ($doc_obj, $cursection, $metadata) = @_;
1030
1031 my $associate_tail_re = $self->{'associate_tail_re'};
1032
1033 foreach my $field (keys(%$metadata)) {
1034 # $metadata->{$field} may be an array reference
1035 if ($field eq "gsdlassocfile_tobe") {
1036 # 'gsdlassocfile_tobe' is artificially introduced metadata
1037 # that is used to signal that certain additional files should
1038 # be tied to this document. Useful in situations where a
1039 # metadata pass in the plugin pipeline works out some files
1040 # need to be associated with a document, but the document hasn't
1041 # been formed yet.
1042 my $equiv_form = "";
1043 foreach my $gaf (@{$metadata->{$field}}) {
1044 my ($full_filename,$mimetype) = ($gaf =~ m/^(.*):(.*):$/);
1045 my ($tail_filename) = ($full_filename =~ /^.*[\/\\](.+?)$/);
1046
1047 # we need to make sure the filename is valid utf-8 - we do
1048 # this by url or base64 encoding it
1049 # $tail_filename is the name that we store the file as
1050 $tail_filename = &util::rename_file($tail_filename, $self->{'file_rename_method'});
1051 $doc_obj->associate_file($full_filename,$tail_filename,$mimetype);
1052 # If the filename is url_encoded, we need to encode the % signs
1053 # in the filename, so that it works in a url
1054 my $url_tail_filename = &unicode::filename_to_url($tail_filename);
1055 # work out extended tail extension (i.e. matching tail re)
1056
1057 my ($file_prefix,$file_extended_ext)
1058 = &util::get_prefix_and_tail_by_regex($tail_filename,$associate_tail_re);
1059 my ($pre_doc_ext) = ($file_extended_ext =~ m/^(.*)\..*$/);
1060 my ($doc_ext) = ($tail_filename =~ m/^.*\.(.*)$/);
1061 my $start_doclink = "<a href=\"_httpprefix_/collect/[collection]/index/assoc/{Or}{[parent(Top):archivedir],[archivedir]}/$url_tail_filename\">";
1062 my $srcicon = "_icon".$doc_ext."_";
1063 my $end_doclink = "</a>";
1064
1065 my $assoc_form = "$start_doclink\{If\}{$srcicon,$srcicon,$doc_ext\}$end_doclink";
1066
1067 if (defined $pre_doc_ext && $pre_doc_ext ne "") {
1068 # for metadata such as [mp3._edited] [mp3._full] ...
1069 $doc_obj->add_utf8_metadata ($cursection, "$doc_ext.$pre_doc_ext", $assoc_form);
1070 }
1071
1072 # for multiple metadata such as [mp3.assoclink]
1073 $doc_obj->add_utf8_metadata ($cursection, "$doc_ext.assoclink", $assoc_form);
1074
1075 $equiv_form .= " $assoc_form";
1076 }
1077 $doc_obj->add_utf8_metadata ($cursection, "equivlink", $equiv_form);
1078 }
1079 elsif (ref ($metadata->{$field}) eq "ARRAY") {
1080 map {
1081 $doc_obj->add_utf8_metadata ($cursection, $field, $_);
1082 } @{$metadata->{$field}};
1083 } else {
1084 $doc_obj->add_utf8_metadata ($cursection, $field, $metadata->{$field});
1085 }
1086 }
1087}
1088
1089
1090sub compile_stats {
1091 my $self = shift(@_);
1092 my ($stats) = @_;
1093
1094 $stats->{'num_processed'} += $self->{'num_processed'};
1095 $stats->{'num_not_processed'} += $self->{'num_not_processed'};
1096 $stats->{'num_archives'} += $self->{'num_archives'};
1097
1098}
1099
1100sub associate_cover_image {
1101 my $self = shift;
1102 my ($doc_obj, $filename) = @_;
1103
1104 $filename =~ s/\.[^\\\/\.]+$/\.jpg/;
1105 if (exists $self->{'covers_missing_cache'}->{$filename}) {
1106 # don't stat() for existence eg for multiple document input files
1107 # (eg SplitPlug)
1108 return;
1109 }
1110
1111 my $top_section=$doc_obj->get_top_section();
1112
1113 if (-e $filename) {
1114 $doc_obj->associate_file($filename, "cover.jpg", "image/jpeg");
1115 $doc_obj->add_utf8_metadata($top_section, "hascover", 1);
1116 } else {
1117 my $upper_filename = $filename;
1118 $upper_filename =~ s/jpg$/JPG/;
1119 if (-e $upper_filename) {
1120 $doc_obj->associate_file($upper_filename, "cover.jpg",
1121 "image/jpeg");
1122 $doc_obj->add_utf8_metadata($top_section, "hascover", 1);
1123 } else {
1124 # file doesn't exist, so record the fact that it's missing so
1125 # we don't stat() again (stat is slow)
1126 $self->{'covers_missing_cache'}->{$filename} = 1;
1127 }
1128 }
1129
1130}
1131
1132
1133# Overridden by exploding plugins (eg. ISISPlug)
1134sub clean_up_after_exploding
1135{
1136 my $self = shift(@_);
1137}
1138
1139
1140
11411;
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