| 1 | ###########################################################################
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| 2 | #
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| 3 | # HTMLPlug.pm -- basic html plugin
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| 4 | #
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| 5 | # A component of the Greenstone digital library software
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| 6 | # from the New Zealand Digital Library Project at the
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| 7 | # University of Waikato, New Zealand.
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| 8 | #
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| 9 | # Copyright (C) 1999 New Zealand Digital Library Project
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| 10 | #
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| 11 | # This program is free software; you can redistribute it and/or modify
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| 12 | # it under the terms of the GNU General Public License as published by
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| 13 | # the Free Software Foundation; either version 2 of the License, or
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| 14 | # (at your option) any later version.
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| 15 | #
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| 16 | # This program is distributed in the hope that it will be useful,
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| 17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | # GNU General Public License for more details.
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| 20 | #
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| 21 | # You should have received a copy of the GNU General Public License
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| 22 | # along with this program; if not, write to the Free Software
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| 23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 24 | #
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| 25 | ###########################################################################
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| 26 |
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| 27 | #
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| 28 | # Note that this plugin handles frames only in a very simple way
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| 29 | # i.e. each frame is treated as a separate document. This means
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| 30 | # search results will contain links to individual frames rather
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| 31 | # than linking to the top level frameset.
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| 32 | # There may also be some problems caused by the _parent target
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| 33 | # (it's removed by this plugin)
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| 34 | # To use frames properly you'll need to use the WebPlug plugin.
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| 35 | #
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| 36 |
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| 37 |
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| 38 | package HTMLPlug;
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| 39 |
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| 40 | use BasPlug;
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| 41 | use html;
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| 42 | use util;
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| 43 | use parsargv;
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| 44 |
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| 45 | sub BEGIN {
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| 46 | @ISA = ('BasPlug');
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| 47 | }
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| 48 |
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| 49 | use strict;
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| 50 |
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| 51 | sub print_usage {
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| 52 | print STDERR "\nIncorrect options passed to HTMLPlug, check your collect.cfg configuration file\n";
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| 53 |
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| 54 | print STDERR "\n usage: plugin HTMLPlug [options]\n\n";
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| 55 | print STDERR " options:\n";
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| 56 | print STDERR " -process_exp A perl regular expression to match against filenames.\n";
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| 57 | print STDERR " Matching filenames will be processed by this plugin.\n";
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| 58 | print STDERR " Defaults to '(?i)\.html?\$' i.e. all documents ending in\n";
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| 59 | print STDERR " .htm or .html (case-insensitive).\n";
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| 60 | print STDERR " -nolinks Don't make any attempt to trap links (setting this flag may\n";
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| 61 | print STDERR " improve speed of building/importing but any relative links within\n";
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| 62 | print STDERR " documents will be broken).\n";
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| 63 | print STDERR " -block_exp Files matching this regular expression will be blocked from\n";
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| 64 | print STDERR " being passed to any further plugins in the list. By default\n";
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| 65 | print STDERR " HTMLPlug blocks any files with .gif, .jpg, .jpeg, .png, .pdf,\n";
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| 66 | print STDERR " .rtf or .css file extensions.\n";
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| 67 | print STDERR " -keep_head Don't remove headers from html files.\n";
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| 68 | print STDERR " -no_metadata Don't attempt to extract any metadata from files.\n";
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| 69 | print STDERR " -metadata_fields Comma separated list of metadata fields to attempt to extract.\n";
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| 70 | print STDERR " Defaults to 'Title'\n";
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| 71 | print STDERR " -w3mir Set if w3mir was used to generate input file structure.\n";
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| 72 | print STDERR " w3mir \n";
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| 73 | }
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| 74 |
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| 75 | sub new {
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| 76 | my $class = shift (@_);
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| 77 | my $self = new BasPlug ();
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| 78 |
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| 79 | if (!parsargv::parse(\@_,
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| 80 | q^process_exp/.*/(?i)\.html?$^, \$self->{'process_exp'},
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| 81 | q^nolinks^, \$self->{'nolinks'},
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| 82 | q^block_exp/.*/(?i)\.(gif|jpe?g|png|pdf|rtf|css)$^, \$self->{'block_exp'},
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| 83 | q^keep_head^, \$self->{'keep_head'},
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| 84 | q^no_metadata^, \$self->{'no_metadata'},
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| 85 | q^metadata_fields/.*/Title^, \$self->{'metadata_fields'},
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| 86 | q^w3mir^, \$self->{'w3mir'})) {
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| 87 | &print_usage();
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| 88 | die "\n";
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| 89 | }
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| 90 |
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| 91 | $self->{'aux_files'} = {};
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| 92 | $self->{'dir_num'} = 0;
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| 93 | $self->{'file_num'} = 0;
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| 94 |
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| 95 | return bless $self, $class;
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| 96 | }
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| 97 |
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| 98 | sub is_recursive {
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| 99 | my $self = shift (@_);
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| 100 |
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| 101 | return 0; # this is not a recursive plugin
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| 102 | }
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| 103 |
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| 104 | # return number of files processed, undef if can't process
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| 105 | # Note that $base_dir might be "" and that $file might
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| 106 | # include directories
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| 107 | sub read {
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| 108 | my $self = shift (@_);
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| 109 | my ($pluginfo, $base_dir, $file, $metadata, $processor) = @_;
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| 110 |
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| 111 | my $filename = &util::filename_cat($base_dir, $file);
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| 112 | return 0 if $filename =~ /$self->{'block_exp'}/;
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| 113 | if ($filename !~ /$self->{'process_exp'}/ || !-f $filename) {
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| 114 | return undef;
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| 115 | }
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| 116 | $file =~ s/^[\/\\]+//;
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| 117 |
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| 118 | $self->{'verbosity'} = $processor->{'verbosity'};
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| 119 | print STDERR "HTMLPlug: processing $file\n"
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| 120 | if $self->{'verbosity'} > 1;
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| 121 |
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| 122 | # create a new document
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| 123 | my $doc_obj = new doc ($file, "indexed_doc");
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| 124 | my $cursection = $doc_obj->get_top_section();
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| 125 |
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| 126 | # read in HTML file
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| 127 | open (FILE, $filename) || die "HTMLPlug::read - can't open $filename\n";
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| 128 | undef $/;
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| 129 | my $text = <FILE>;
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| 130 | $/ = "\n";
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| 131 | close FILE;
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| 132 | if ($text !~ /\w/) {
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| 133 | print STDERR "HTMLPlug: ERROR: $file contains no text\n" if $self->{'verbosity'};
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| 134 | return 0;
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| 135 | }
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| 136 |
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| 137 | $self->extra_metadata ($doc_obj, $cursection, $metadata);
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| 138 | $self->extract_metadata (\$text, $metadata, $doc_obj, $cursection)
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| 139 | unless $self->{'no_metadata'};
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| 140 |
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| 141 | # Store URL for page as metadata - this can be used for an
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| 142 | # altavista style search interface. The URL won't be valid
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| 143 | # unless the file structure contains the domain name (i.e.
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| 144 | # like when w3mir is used to download a website).
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| 145 | my $web_url = "http://$file";
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| 146 | $web_url =~ s/\\/\//g; # for windows
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| 147 | $doc_obj->add_metadata($cursection, "URL", $web_url);
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| 148 |
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| 149 | # remove header and footer
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| 150 | if (!$self->{'keep_head'}) {
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| 151 | $text =~ s/^.*?<body[^>]*>//is;
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| 152 | $text =~ s/(<\/body[^>]*>|<\/html[^>]*>)//isg;
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| 153 | }
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| 154 |
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| 155 | # trap links
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| 156 | if (!$self->{'nolinks'}) {
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| 157 |
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| 158 | # usemap="./#index" not handled correctly => change to "#index"
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| 159 | $text =~ s/(<img[^>]*?usemap\s*=\s*\"?)([^\">\s]+)(\"?[^>]*>)/
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| 160 | $self->replace_usemap_links($1, $2, $3)/isge;
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| 161 |
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| 162 | $text =~ s/(<(?:a|area|frame|link)\s+[^>]*?(?:href|src)\s*=\s*\"?)([^\">\s]+)(\"?[^>]*>)/
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| 163 | $self->replace_href_links ($1, $2, $3, $base_dir, $file, $doc_obj, $cursection)/isge;
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| 164 | }
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| 165 |
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| 166 | # trap images
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| 167 | $text =~ s/(<img[^>]*?src\s*=\s*\"?)([^\">\s]+)(\"?[^>]*>)/
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| 168 | $self->replace_images ($1, $2, $3, $base_dir, $file, $doc_obj, $cursection)/isge;
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| 169 |
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| 170 | $doc_obj->add_text ($cursection, $text);
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| 171 |
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| 172 | # add an OID
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| 173 | $doc_obj->set_OID();
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| 174 |
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| 175 | # process the document
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| 176 | $processor->process($doc_obj);
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| 177 |
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| 178 | return 1; # processed the file
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| 179 | }
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| 180 |
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| 181 | sub replace_images {
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| 182 | my $self = shift (@_);
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| 183 | my ($front, $link, $back, $base_dir,
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| 184 | $file, $doc_obj, $section) = @_;
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| 185 |
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| 186 | $link =~ s/\n/ /g;
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| 187 |
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| 188 | my ($href, $hash_part, $rl) = $self->format_link ($link, $base_dir, $file);
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| 189 | return $front . $self->add_file ($href, $base_dir, $doc_obj, $section) . $back;
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| 190 | }
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| 191 |
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| 192 | sub replace_href_links {
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| 193 | my $self = shift (@_);
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| 194 | my ($front, $link, $back, $base_dir, $file, $doc_obj, $section) = @_;
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| 195 |
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| 196 | # attempt to sort out targets - frames are not handled
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| 197 | # well in this plugin and some cases will screw things
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| 198 | # up - e.g. the _parent target (so we'll just remove
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| 199 | # them all ;-)
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| 200 | $front =~ s/(target=\"?)_top(\"?)/$1_gsdltop_$2/is;
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| 201 | $back =~ s/(target=\"?)_top(\"?)/$1_gsdltop_$2/is;
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| 202 | $front =~ s/target=\"?_parent\"?//is;
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| 203 | $back =~ s/target=\"?_parent\"?//is;
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| 204 |
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| 205 | return $front . $link . $back if $link =~ /^\#/s;
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| 206 | $link =~ s/\n/ /g;
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| 207 |
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| 208 | my ($href, $hash_part, $rl) = $self->format_link ($link, $base_dir, $file);
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| 209 |
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| 210 | my ($filename) = $href =~ /^(?:.*?):(?:\/\/)?(.*)/;
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| 211 |
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| 212 | ##### leave all these links alone (they won't be picked up by intermediate
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| 213 | ##### pages). I think that's safest when dealing with frames, targets etc.
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| 214 | ##### (at least until I think of a better way to do it). Problems occur with
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| 215 | ##### mailto links from within small frames, the intermediate page is displayed
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| 216 | ##### within that frame and can't be seen. There is still potential for this to
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| 217 | ##### happen even with html pages - the solution seems to be to somehow tell
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| 218 | ##### the browser from the server side to display the page being sent (i.e.
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| 219 | ##### the intermediate page) in the top level window - I'm not sure if that's
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| 220 | ##### possible - the following line should probably be deleted if that can be done
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| 221 | return $front . $link . $back if $href =~ /^(mailto|news|gopher|nntp|telnet|javascript):/is;
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| 222 |
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| 223 |
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| 224 | if (($rl == 0) || ($filename =~ /$self->{'process_exp'}/) ||
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| 225 | ($href =~ /\/$/) || ($href =~ /^(mailto|news|gopher|nntp|telnet|javascript):/i)) {
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| 226 | &html::urlsafe ($href);
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| 227 | return $front . "_httpextlink_&rl=" . $rl . "&href=" . $href . $hash_part . $back;
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| 228 |
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| 229 | } else {
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| 230 | # link is to some other type of file (image, pdf etc.) so we'll
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| 231 | # need to associate that file
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| 232 | return $front . $self->add_file ($href, $base_dir, $doc_obj, $section) . $back;
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| 233 | }
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| 234 | }
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| 235 |
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| 236 | sub add_file {
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| 237 | my $self = shift (@_);
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| 238 | my ($href, $base_dir, $doc_obj, $section) = @_;
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| 239 | my ($newname);
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| 240 |
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| 241 | my $filename = $href;
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| 242 | $filename =~ s/^[^:]*:\/\///;
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| 243 | $filename = &util::filename_cat ($base_dir, $filename);
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| 244 | my ($ext) = $filename =~ /(\.[^\.]*)$/;
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| 245 | if (defined $self->{'aux_files'}->{$href}) {
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| 246 | $newname = $self->{'aux_files'}->{$href}->{'dir_num'} . "/" .
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| 247 | $self->{'aux_files'}->{$href}->{'file_num'} . $ext;
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| 248 | } else {
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| 249 | $newname = $self->{'dir_num'} . "/" . $self->{'file_num'} . $ext;
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| 250 | $self->inc_filecount ();
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| 251 | }
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| 252 | $doc_obj->associate_file($filename, $newname, undef, $section);
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| 253 | return "_httpcollimg_/$newname";
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| 254 | }
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| 255 |
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| 256 |
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| 257 | sub format_link {
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| 258 | my $self = shift (@_);
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| 259 | my ($link, $base_dir, $file) = @_;
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| 260 |
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| 261 | my ($before_hash, $hash_part) = $link =~ /^([^\#]*)(\#?.*)$/;
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| 262 | $hash_part = "" if !defined $hash_part;
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| 263 | if (!defined $before_hash || $before_hash !~ /[\w\.\/]/) {
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| 264 | print STDERR "HTMLPlug: ERROR - badly formatted tag ignored ($link)\n"
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| 265 | if $self->{'verbosity'};
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| 266 | return ($link, "", 0);
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| 267 | }
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| 268 |
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| 269 | if ($before_hash =~ s/^((?:http|ftp|file):\/\/)//i) {
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| 270 | my $type = $1;
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| 271 |
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| 272 | if ($link =~ /^(http|ftp):/i) {
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| 273 | # Turn url (using /) into file name (possibly using \ on windows)
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| 274 | my @http_dir_split = split('/', $before_hash);
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| 275 | $before_hash = &util::filename_cat(@http_dir_split);
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| 276 | }
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| 277 |
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| 278 | $before_hash = $self->eval_dir_dots($before_hash);
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| 279 |
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| 280 | my $linkfilename = &util::filename_cat ($base_dir, $before_hash);
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| 281 |
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| 282 | my $rl = 0;
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| 283 | $rl = 1 if (-e $linkfilename);
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| 284 |
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| 285 | # make sure there's a slash on the end if it's a directory
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| 286 | if ($before_hash !~ /\/$/) {
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| 287 | $before_hash .= "/" if (-d $linkfilename);
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| 288 | }
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| 289 |
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| 290 | return ($type . $before_hash, $hash_part, $rl);
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| 291 |
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| 292 | } elsif ($link !~ /^(mailto|news|gopher|nntp|telnet|javascript):/i) {
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| 293 |
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| 294 | if ($before_hash =~ s/^\///) {
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| 295 | # the first directory will be the domain name if w3mir was used
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| 296 | # to generate archives, otherwise we'll assume all files are
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| 297 | # from the same site and base_dir is the root
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| 298 | if ($self->{'w3mir'}) {
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| 299 | my @dirs = split /[\/\\]/, $file;
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| 300 | my $domname = shift (@dirs);
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| 301 | $before_hash = &util::filename_cat($domname, $before_hash);
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| 302 | $before_hash =~ s/\\/\//g; # for windows
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| 303 | }
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| 304 |
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| 305 | } else {
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| 306 | # Turn relative file path into full path
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| 307 | my $dirname = &File::Basename::dirname($file);
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| 308 | $before_hash = &util::filename_cat($dirname, $before_hash);
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| 309 | $before_hash = $self->eval_dir_dots($before_hash);
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| 310 | }
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| 311 |
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| 312 | # make sure there's a slash on the end if it's a directory
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| 313 | my $linkfilename = &util::filename_cat ($base_dir, $before_hash);
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| 314 | if ($before_hash !~ /\/$/) {
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| 315 | $before_hash .= "/" if (-d $linkfilename);
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| 316 | }
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| 317 |
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| 318 | return ("http://" . $before_hash, $hash_part, 1);
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| 319 |
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| 320 | } else {
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| 321 | # mailto, news, nntp, telnet, javascript or gopher link
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| 322 | return ($before_hash, "", 0);
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| 323 | }
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| 324 | }
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| 325 |
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| 326 | sub extract_metadata {
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| 327 | my $self = shift (@_);
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| 328 | my ($textref, $metadata, $doc_obj, $section) = @_;
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| 329 |
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| 330 | foreach my $field (split /,/, $self->{'metadata_fields'}) {
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| 331 |
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| 332 | # don't need to extract field if it was passed in from a previous
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| 333 | # (recursive) plugin
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| 334 | next if defined $metadata->{$field};
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| 335 |
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| 336 | # see if there's a <meta> tag for this field
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| 337 | if ($$textref =~ /<meta(.*?)(?:name|http-equiv)\s*=\s*\"?$field\"?([^>]*)/is) {
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| 338 | my $content = $1 . $2;
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| 339 | if ($content =~ /content\s*=\s*\"?(.*?)\"?/is) {
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| 340 | if (defined $1) {
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| 341 | my $value = $1;
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| 342 | $value =~ s/\s+/ /gs;
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| 343 | $doc_obj->add_metadata($section, $field, $value);
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| 344 | next;
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| 345 | }
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| 346 | }
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| 347 | }
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| 348 |
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| 349 | # special case for Title metadata - try <title> tags
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| 350 | # then first 100 characters of text
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| 351 |
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| 352 | if ($field =~ /^title$/i) {
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| 353 |
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| 354 | # see if there's a <title> tag
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| 355 | if ($$textref =~ /<title[^>]*>([^<]*)<\/title[^>]*>/is) {
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| 356 | if (defined $1) {
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| 357 | my $title = $1;
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| 358 | if ($title =~ /\w/) {
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| 359 | $title =~ s/\s+/ /gs;
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| 360 | $doc_obj->add_metadata ($section, $field, $title);
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| 361 | next;
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| 362 | }
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| 363 | }
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| 364 | }
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| 365 |
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| 366 | # if no title use first 100 characters
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| 367 | my $tmptext = $$textref;
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| 368 | $tmptext =~ s/<[^>]*>//g;
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| 369 | my $title = substr ($tmptext, 0, 100);
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| 370 | $title =~ s/\s+/ /gs;
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| 371 | $doc_obj->add_metadata ($section, $field, $title);
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| 372 | }
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| 373 | }
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| 374 | }
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| 375 |
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| 376 | # evaluate any "../" to next directory up
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| 377 | # evaluate any "./" as here
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| 378 | sub eval_dir_dots {
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| 379 | my $self = shift (@_);
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| 380 | my ($filename) = @_;
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| 381 |
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| 382 | my $dirsep_os = &util::get_os_dirsep();
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| 383 | my @dirsep = split(/$dirsep_os/,$filename);
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| 384 |
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| 385 | my @eval_dirs = ();
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| 386 | foreach my $d (@dirsep) {
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| 387 | if ($d eq "..") {
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| 388 | pop(@eval_dirs);
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| 389 |
|
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| 390 | } elsif ($d eq ".") {
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| 391 | # do nothing!
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| 392 |
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| 393 | } else {
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| 394 | push(@eval_dirs,$d);
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| 395 | }
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| 396 | }
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| 397 |
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| 398 | return &util::filename_cat(@eval_dirs);
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| 399 | }
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| 400 |
|
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| 401 | sub replace_usemap_links {
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| 402 | my $self = shift (@_);
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| 403 | my ($front, $link, $back) = @_;
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| 404 |
|
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| 405 | $link =~ s/^\.\///;
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| 406 | return $front . $link . $back;
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| 407 | }
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| 408 |
|
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| 409 | sub inc_filecount {
|
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| 410 | my $self = shift (@_);
|
|---|
| 411 |
|
|---|
| 412 | if ($self->{'file_num'} == 1000) {
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|---|
| 413 | $self->{'dir_num'} ++;
|
|---|
| 414 | $self->{'file_num'} = 0;
|
|---|
| 415 | } else {
|
|---|
| 416 | $self->{'file_num'} ++;
|
|---|
| 417 | }
|
|---|
| 418 | }
|
|---|
| 419 |
|
|---|
| 420 | 1;
|
|---|
