| 1 | ###########################################################################
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| 2 | #
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| 3 | # PDFPlugin.pm -- reasonably with-it pdf plugin
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| 4 | # A component of the Greenstone digital library software
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| 5 | # from the New Zealand Digital Library Project at the
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| 6 | # University of Waikato, New Zealand.
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| 7 | #
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| 8 | # Copyright (C) 1999-2001 New Zealand Digital Library Project
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| 9 | #
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| 10 | # This program is free software; you can redistribute it and/or modify
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| 11 | # it under the terms of the GNU General Public License as published by
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| 12 | # the Free Software Foundation; either version 2 of the License, or
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| 13 | # (at your option) any later version.
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| 14 | #
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| 15 | # This program is distributed in the hope that it will be useful,
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| 16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | # GNU General Public License for more details.
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| 19 | #
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| 20 | # You should have received a copy of the GNU General Public License
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| 21 | # along with this program; if not, write to the Free Software
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| 22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 23 | #
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| 24 | ###########################################################################
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| 25 | package PDFPlugin;
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| 26 |
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| 27 | use strict;
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| 28 | no strict 'refs'; # so we can use a var for filehandles (e.g. STDERR)
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| 29 |
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| 30 | use ReadTextFile;
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| 31 | use unicode;
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| 32 |
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| 33 | use AutoLoadConverters;
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| 34 | use ConvertBinaryFile;
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| 35 |
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| 36 | @PDFPlugin::ISA = ('ConvertBinaryFile', 'AutoLoadConverters', 'ReadTextFile');
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| 37 |
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| 38 |
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| 39 | my $convert_to_list =
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| 40 | [ { 'name' => "auto",
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| 41 | 'desc' => "{ConvertBinaryFile.convert_to.auto}" },
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| 42 | { 'name' => "html",
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| 43 | 'desc' => "{ConvertBinaryFile.convert_to.html}" },
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| 44 | { 'name' => "text",
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| 45 | 'desc' => "{ConvertBinaryFile.convert_to.text}" },
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| 46 | { 'name' => "pagedimg_jpg",
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| 47 | 'desc' => "{ConvertBinaryFile.convert_to.pagedimg_jpg}"},
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| 48 | { 'name' => "pagedimg_gif",
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| 49 | 'desc' => "{ConvertBinaryFile.convert_to.pagedimg_gif}"},
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| 50 | { 'name' => "pagedimg_png",
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| 51 | 'desc' => "{ConvertBinaryFile.convert_to.pagedimg_png}"},
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| 52 | ];
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| 53 |
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| 54 |
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| 55 | my $arguments =
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| 56 | [
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| 57 | { 'name' => "convert_to",
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| 58 | 'desc' => "{ConvertBinaryFile.convert_to}",
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| 59 | 'type' => "enum",
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| 60 | 'reqd' => "yes",
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| 61 | 'list' => $convert_to_list,
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| 62 | 'deft' => "html" },
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| 63 | { 'name' => "process_exp",
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| 64 | 'desc' => "{BasePlugin.process_exp}",
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| 65 | 'type' => "regexp",
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| 66 | 'deft' => &get_default_process_exp(),
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| 67 | 'reqd' => "no" },
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| 68 | { 'name' => "block_exp",
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| 69 | 'desc' => "{BasePlugin.block_exp}",
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| 70 | 'type' => "regexp",
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| 71 | 'deft' => &get_default_block_exp() },
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| 72 | { 'name' => "metadata_fields",
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| 73 | 'desc' => "{HTMLPlugin.metadata_fields}",
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| 74 | 'type' => "string",
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| 75 | 'deft' => "Title,Author,Subject,Keywords" },
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| 76 | { 'name' => "metadata_field_separator",
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| 77 | 'desc' => "{HTMLPlugin.metadata_field_separator}",
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| 78 | 'type' => "string",
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| 79 | 'deft' => "" },
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| 80 | { 'name' => "noimages",
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| 81 | 'desc' => "{PDFPlugin.noimages}",
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| 82 | 'type' => "flag" },
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| 83 | { 'name' => "allowimagesonly",
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| 84 | 'desc' => "{PDFPlugin.allowimagesonly}",
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| 85 | 'type' => "flag" },
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| 86 | { 'name' => "complex",
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| 87 | 'desc' => "{PDFPlugin.complex}",
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| 88 | 'type' => "flag" },
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| 89 | { 'name' => "nohidden",
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| 90 | 'desc' => "{PDFPlugin.nohidden}",
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| 91 | 'type' => "flag" },
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| 92 | { 'name' => "zoom",
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| 93 | 'desc' => "{PDFPlugin.zoom}",
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| 94 | 'deft' => "2",
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| 95 | 'range' => "1,3", # actually the range is 0.5-3
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| 96 | 'type' => "int" },
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| 97 | { 'name' => "use_sections",
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| 98 | 'desc' => "{PDFPlugin.use_sections}",
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| 99 | 'type' => "flag" },
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| 100 | { 'name' => "description_tags",
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| 101 | 'desc' => "{HTMLPlugin.description_tags}",
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| 102 | 'type' => "flag" },
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| 103 | { 'name' => "use_realistic_book",
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| 104 | 'desc' => "{PDFPlugin.use_realistic_book}",
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| 105 | 'type' => "flag"}
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| 106 | ];
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| 107 |
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| 108 | my $options = { 'name' => "PDFPlugin",
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| 109 | 'desc' => "{PDFPlugin.desc}",
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| 110 | 'abstract' => "no",
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| 111 | 'inherits' => "yes",
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| 112 | 'srcreplaceable' => "yes", # Source docs in PDF can be replaced with GS-generated html
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| 113 | 'args' => $arguments };
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| 114 |
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| 115 | sub new {
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| 116 | my ($class) = shift (@_);
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| 117 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 118 | push(@$pluginlist, $class);
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| 119 |
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| 120 | push(@$inputargs,"-title_sub");
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| 121 | push(@$inputargs,'^(Page\s+\d+)?(\s*1\s+)?');
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| 122 |
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| 123 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 124 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 125 |
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| 126 | my $auto_converter_self = new AutoLoadConverters($pluginlist,$inputargs,$hashArgOptLists,["PDFBoxConverter"],1);
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| 127 | my $cbf_self = new ConvertBinaryFile($pluginlist, $inputargs, $hashArgOptLists);
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| 128 | my $self = BasePlugin::merge_inheritance($auto_converter_self, $cbf_self);
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| 129 |
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| 130 | if ($self->{'info_only'}) {
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| 131 | # don't worry about any options etc
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| 132 | return bless $self, $class;
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| 133 | }
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| 134 |
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| 135 | $self = bless $self, $class;
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| 136 | $self->{'file_type'} = "PDF";
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| 137 |
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| 138 | # these are passed through to gsConvert.pl by ConvertBinaryFile.pm
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| 139 | my $zoom = $self->{"zoom"};
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| 140 | $self->{'convert_options'} = "-pdf_zoom $zoom";
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| 141 | $self->{'convert_options'} .= " -pdf_complex" if $self->{"complex"};
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| 142 | $self->{'convert_options'} .= " -pdf_nohidden" if $self->{"nohidden"};
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| 143 | $self->{'convert_options'} .= " -pdf_ignore_images" if $self->{"noimages"};
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| 144 | $self->{'convert_options'} .= " -pdf_allow_images_only" if $self->{"allowimagesonly"};
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| 145 |
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| 146 | # check convert_to
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| 147 | if ($self->{'convert_to'} eq "text" && $ENV{'GSDLOS'} =~ /^windows$/i) {
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| 148 | print STDERR "Windows does not support pdf to text. PDFs will be converted to HTML instead\n";
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| 149 | $self->{'convert_to'} = "html";
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| 150 | }
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| 151 | elsif ($self->{'convert_to'} eq "auto") {
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| 152 | # choose html ?? is this the best option
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| 153 | $self->{'convert_to'} = "html";
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| 154 | }
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| 155 | if ($self->{'use_realistic_book'}) {
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| 156 | if ($self->{'convert_to'} ne "html") {
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| 157 | print STDERR "PDFs will be converted to HTML for realistic book functionality\n";
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| 158 | $self->{'convert_to'} = "html";
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| 159 | }
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| 160 | }
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| 161 | # set convert_to_plugin and convert_to_ext
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| 162 | $self->set_standard_convert_settings();
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| 163 |
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| 164 | my $secondary_plugin_name = $self->{'convert_to_plugin'};
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| 165 | my $secondary_plugin_options = $self->{'secondary_plugin_options'};
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| 166 |
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| 167 | if (!defined $secondary_plugin_options->{$secondary_plugin_name}) {
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| 168 | $secondary_plugin_options->{$secondary_plugin_name} = [];
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| 169 | }
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| 170 | my $specific_options = $secondary_plugin_options->{$secondary_plugin_name};
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| 171 |
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| 172 | # following title_sub removes "Page 1" added by pdftohtml, and a leading
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| 173 | # "1", which is often the page number at the top of the page. Bad Luck
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| 174 | # if your document title actually starts with "1 " - is there a better way?
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| 175 | push(@$specific_options , "-title_sub", '^(Page\s+\d+)?(\s*1\s+)?');
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| 176 | my $associate_tail_re = $self->{'associate_tail_re'};
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| 177 | if ((defined $associate_tail_re) && ($associate_tail_re ne "")) {
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| 178 | push(@$specific_options, "-associate_tail_re", $associate_tail_re);
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| 179 | }
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| 180 | push(@$specific_options, "-file_rename_method", "none");
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| 181 |
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| 182 | if ($secondary_plugin_name eq "HTMLPlugin") {
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| 183 | # pdftohtml always produces utf8 - What about pdfbox???
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| 184 | # push(@$specific_options, "-input_encoding", "utf8");
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| 185 | push(@$specific_options, "-extract_language") if $self->{'extract_language'};
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| 186 | push(@$specific_options, "-processing_tmp_files");
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| 187 | # Instruct HTMLPlug (when eventually accessed through read_into_doc_obj)
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| 188 | # to extract these metadata fields from the HEAD META fields
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| 189 | if (defined $self->{'metadata_fields'} && $self->{'metadata_fields'} =~ /\S/) {
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| 190 | push(@$specific_options,"-metadata_fields",$self->{'metadata_fields'});
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| 191 | } else {
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| 192 | push(@$specific_options,"-metadata_fields","Title,GENERATOR,date,author<Creator>");
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| 193 | }
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| 194 | if (defined $self->{'metadata_field_separator'} && $self->{'metadata_field_separator'} =~ /\S/) {
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| 195 | push(@$specific_options,"-metadata_field_separator",$self->{'metadata_field_separator'});
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| 196 | }
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| 197 | if ($self->{'use_sections'} || $self->{'description_tags'}) {
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| 198 | $self->{'description_tags'} = 1;
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| 199 | push(@$specific_options, "-description_tags");
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| 200 | }
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| 201 | if ($self->{'use_realistic_book'}) {
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| 202 | push(@$specific_options, "-use_realistic_book");
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| 203 | }
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| 204 | }
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| 205 | elsif ($secondary_plugin_name eq "PagedImagePlugin") {
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| 206 | push(@$specific_options, "-screenviewsize", "1000");
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| 207 | push(@$specific_options, "-enable_cache");
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| 208 | push(@$specific_options, "-processing_tmp_files");
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| 209 | }
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| 210 |
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| 211 | $self = bless $self, $class;
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| 212 | $self->load_secondary_plugins($class,$secondary_plugin_options,$hashArgOptLists);
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| 213 | return $self;
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| 214 | }
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| 215 |
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| 216 | sub get_default_process_exp {
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| 217 | my $self = shift (@_);
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| 218 |
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| 219 | return q^(?i)\.pdf$^;
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| 220 | }
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| 221 |
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| 222 | # so we don't inherit HTMLPlug's block exp...
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| 223 | sub get_default_block_exp {
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| 224 | return "";
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| 225 | }
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| 226 |
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| 227 | sub init {
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| 228 | my $self = shift (@_);
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| 229 |
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| 230 | # ConvertBinaryFile init
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| 231 | $self->SUPER::init(@_);
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| 232 | $self->AutoLoadConverters::init(@_);
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| 233 |
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| 234 | }
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| 235 |
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| 236 | sub begin {
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| 237 | my $self = shift (@_);
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| 238 |
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| 239 | $self->AutoLoadConverters::begin(@_);
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| 240 | $self->SUPER::begin(@_);
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| 241 |
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| 242 | }
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| 243 |
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| 244 | sub deinit {
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| 245 | my $self = shift (@_);
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| 246 |
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| 247 | $self->AutoLoadConverters::deinit(@_);
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| 248 | $self->SUPER::deinit(@_);
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| 249 |
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| 250 | }
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| 251 |
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| 252 | # By setting hashing to be on ga xml this ensures that two
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| 253 | # PDF files that are identical except for the metadata
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| 254 | # to hash to different values. Without this, when each PDF
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| 255 | # file is converted to HTML there is a chance that they
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| 256 | # will both be *identical* if the conversion utility does
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| 257 | # not embed the metadata in the generated HTML. This is
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| 258 | # certainly the case when PDFBOX is being used.
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| 259 |
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| 260 | # This change makes this convert to based plugin more
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| 261 | # consistent with the original vision that the same document
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| 262 | # with different metadata should
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| 263 | # be seen as different.
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| 264 |
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| 265 | sub get_oid_hash_type {
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| 266 | my $self = shift (@_);
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| 267 | return "hash_on_ga_xml";
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| 268 | }
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| 269 |
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| 270 |
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| 271 | sub tmp_area_convert_file {
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| 272 |
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| 273 | my $self = shift (@_);
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| 274 | return $self->AutoLoadConverters::tmp_area_convert_file(@_);
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| 275 |
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| 276 | }
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| 277 |
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| 278 | sub convert_post_process
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| 279 | {
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| 280 | my $self = shift (@_);
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| 281 | my ($conv_filename) = @_;
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| 282 |
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| 283 | my $outhandle=$self->{'outhandle'};
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| 284 |
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| 285 | #$self->{'input_encoding'} = "utf8"; # The output is always in utf8 (is it?? it is for html, but what about other types?)
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| 286 | #my ($language, $encoding) = $self->textcat_get_language_encoding ($conv_filename);
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| 287 |
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| 288 | # read in file ($text will be in utf8)
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| 289 | my $text = "";
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| 290 | # encoding will be utf8 for html files - what about other types? will we do this step for them anyway?
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| 291 | $self->read_file ($conv_filename, "utf8", "", \$text);
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| 292 |
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| 293 | # To support the use_sections option with PDFBox: Greenstone splits PDFs into pages for
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| 294 | # sections. The PDFPlugin code wants each new page to be prefixed with <a name=pagenum></a>,
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| 295 | # which it then splits on to generate page-based sections. However, that's not what PDFBox
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| 296 | # generates in its HTML output. Fortunately, PDFBox does have its own page-separator: it
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| 297 | # embeds each page in an extra div. The div opener is:
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| 298 | # <div style=\"page-break-before:always; page-break-after:always\">
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| 299 | # The PDFPlugin now looks for this and prefixes <a name=0></a> to each such div. (The
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| 300 | # pagenumber is fixed at 0 since I'm unable to work out how to increment the pagenum during
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| 301 | # a regex substitution even with regex extensions on.) Later, when we process each section
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| 302 | # to get the pagenum, PDFBox's output for this is pre-processed by having a loopcounter
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| 303 | # that increments the pagenum for each subsequent section.
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| 304 |
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| 305 | #$pdfbox_pageheader="\<div style=\"page-break-before:always; page-break-after:always\">";
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| 306 | my $loopcounter = 0; # used later on!
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| 307 | $text =~ s@\<div style=\"page-break-before:always; page-break-after:always\">@<a name=$loopcounter></a><div style=\"page-break-before:always; page-break-after:always\">@g;
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| 308 |
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| 309 |
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| 310 | # Calculate number of pages based on <a ...> tags (we have a <a name=1> etc
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| 311 | # for each page). Metadata based on this calculation not set until process()
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| 312 | #
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| 313 | # Note: this is done even if we are not breaking the document into pages as it might
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| 314 | # be useful to give an indication of document length in browser through setting
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| 315 | # num_pages as metadata.
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| 316 | # Clean html from low and hight surrogates D800âDFFF
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| 317 | $text =~ s@[\N{U+D800}-\N{U+DFFF}]@\ @g;
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| 318 | my @pages = ($text =~ m/\<[Aa] name=\"?\w+\"?>/ig); #<div style=\"?page-break-before:always; page-break-after:always\"?>
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| 319 | my $num_pages = scalar(@pages);
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| 320 | $self->{'num_pages'} = $num_pages;
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| 321 |
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| 322 | if ($self->{'use_sections'}
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| 323 | && $self->{'converted_to'} eq "HTML") {
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| 324 |
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| 325 | print $outhandle "PDFPlugin: Calculating sections...\n";
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| 326 |
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| 327 | # we have "<a name=1></a>" etc for each page
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| 328 | # it may be <A name=
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| 329 | my @sections = split('<[Aa] name=', $text);
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| 330 |
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| 331 | my $top_section = "";
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| 332 |
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| 333 | if (scalar (@sections) == 1) { #only one section - no split!
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| 334 | print $outhandle "PDFPlugin: warning - no sections found\n";
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| 335 | } else {
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| 336 | $top_section .= shift @sections; # keep HTML header etc as top_section
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| 337 | }
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| 338 |
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| 339 | # handle first section specially for title? Or all use first 100...
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| 340 |
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| 341 | my $title = $sections[0];
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| 342 | $title =~ s/^\"?\w+\"?>//; # specific for pdftohtml...
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| 343 | $title =~ s/<\/([^>]+)><\1>//g; # (eg) </b><b> - no space
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| 344 | $title =~ s/<[^>]*>/ /g;
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| 345 | $title =~ s/(?: |\xc2\xa0)/ /g; # utf-8 for nbsp...
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| 346 | $title =~ s/^\s+//s;
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| 347 | $title =~ s/\s+$//;
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| 348 | $title =~ s/\s+/ /gs;
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| 349 | $title =~ s/^$self->{'title_sub'}// if ($self->{'title_sub'});
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| 350 | $title =~ s/^\s+//s; # in case title_sub introduced any...
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| 351 | $title = substr ($title, 0, 100);
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| 352 | $title =~ s/\s\S*$/.../;
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| 353 |
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| 354 |
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| 355 | if (scalar (@sections) == 1) { # no sections found
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| 356 | $top_section .= $sections[0];
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| 357 | @sections=();
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| 358 | } else {
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| 359 | $top_section .= "<!--<Section>\n<Metadata name=\"Title\">$title</Metadata>\n-->\n <!--</Section>-->\n";
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| 360 | }
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| 361 |
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| 362 | # add metadata per section...
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| 363 | foreach my $section (@sections) {
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| 364 | # section names are not always just digits, may be like "outline"
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| 365 | $section =~ s@^\"?(\w+)\"?></a>@@; # leftover from split expression...
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| 366 |
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| 367 | $title = $1; # Greenstone does magic if sections are titled digits
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| 368 |
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| 369 | # A title of pagenum=0 means use_sections is being applied on output from PDFBox,
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| 370 | # which didn't originally have a <a name=incremented pagenumber></a> to split each page.
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| 371 | # Our Perl code then prefixed <a name=0></a> to it. Now need to increment the pagenum here:
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| 372 | if($loopcounter > 0 || ($title eq 0 && $loopcounter == 0)) { # implies use_sections with PDFBox
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| 373 | $title = ++$loopcounter;
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| 374 | }
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| 375 |
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| 376 | if (! defined($title) ) {
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| 377 | print STDERR "no title: $section\n";
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| 378 | $title = " "; # get rid of the undefined warning in next line
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| 379 | }
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| 380 | my $newsection = "<!-- from PDFPlugin -->\n<!-- <Section>\n";
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| 381 | $newsection .= "<Metadata name=\"Title\">" . $title
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| 382 | . "</Metadata>\n--><br />\n";
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| 383 | $newsection .= $section;
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| 384 | $newsection .= "<!--</Section>-->\n";
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| 385 | $section = $newsection;
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| 386 | }
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| 387 |
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| 388 | $text=join('', ($top_section, @sections));
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| 389 | }
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| 390 |
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| 391 | if ($self->{'use_sections'}
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| 392 | && $self->{'converted_to'} eq "text") {
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| 393 | print STDERR "**** When converting PDF to text, cannot apply use_sections\n";
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| 394 | }
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| 395 |
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| 396 |
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| 397 | # The following should no longer be needed, now that strings
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| 398 | # read in are Unicode aware (in the Perl sense) rather than
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| 399 | # raw binary strings that just happen to be UTF-8 compliant
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| 400 |
|
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| 401 | # turn any high bytes that aren't valid utf-8 into utf-8.
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| 402 | ## unicode::ensure_utf8(\$text);
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| 403 |
|
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| 404 | # Write it out again!
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| 405 | $self->utf8_write_file (\$text, $conv_filename);
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| 406 | }
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| 407 |
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| 408 |
|
|---|
| 409 | # do plugin specific processing of doc_obj for HTML type
|
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| 410 | sub process {
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|---|
| 411 | my $self = shift (@_);
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| 412 | my ($pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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| 413 |
|
|---|
| 414 | my $result = $self->process_type($base_dir,$file,$doc_obj);
|
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| 415 |
|
|---|
| 416 | # fix up the extracted date metadata to be in Greenstone date format,
|
|---|
| 417 | # and fix the capitalisation of 'date'
|
|---|
| 418 | my $cursection = $doc_obj->get_top_section();
|
|---|
| 419 | foreach my $datemeta (@{$doc_obj->get_metadata($cursection, "date")}) {
|
|---|
| 420 | $doc_obj->delete_metadata($cursection, "date", $datemeta);
|
|---|
| 421 |
|
|---|
| 422 | # We're just interested in the date bit, not the time
|
|---|
| 423 | # some pdf creators (eg "Acrobat 5.0 Scan Plug-in for Windows")
|
|---|
| 424 | # set a /CreationDate, and set /ModDate to 000000000. pdftohtml
|
|---|
| 425 | # extracts the ModDate, so it is 0...
|
|---|
| 426 | $datemeta =~ /(\d+)-(\d+)-(\d+)/;
|
|---|
| 427 | my ($year, $month, $day) = ($1,$2,$3);
|
|---|
| 428 | if (defined($year) && defined($month) && defined($day)) {
|
|---|
| 429 | if ($year == 0) {next}
|
|---|
| 430 | if ($year < 100) {$year += 1900} # just to be safe
|
|---|
| 431 | if ($month =~ /^\d$/) {$month="0$month"} # single digit
|
|---|
| 432 | if ($day =~ /^\d$/) {$day="0$day"} # single digit
|
|---|
| 433 | my $date="$year$month$day";
|
|---|
| 434 | $doc_obj->add_utf8_metadata($cursection, "Date", $date);
|
|---|
| 435 | }
|
|---|
| 436 | }
|
|---|
| 437 |
|
|---|
| 438 | $doc_obj->add_utf8_metadata($cursection, "NumPages", $self->{'num_pages'}) if defined $self->{'num_pages'};
|
|---|
| 439 |
|
|---|
| 440 | if ($self->{'use_sections'} && $self->{'converted_to'} eq "HTML") {
|
|---|
| 441 | # we explicitly make it a paged document, cos greenstone won't get it
|
|---|
| 442 | # right if any section has an empty title, or one with letters in it
|
|---|
| 443 | $doc_obj->set_utf8_metadata_element ($cursection, "gsdlthistype", "Paged");
|
|---|
| 444 | }
|
|---|
| 445 |
|
|---|
| 446 | return $result;
|
|---|
| 447 | }
|
|---|
| 448 |
|
|---|
| 449 | 1;
|
|---|
