| 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 ghtml;
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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 | sub print_usage {
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| 50 | print STDERR "\n usage: plugin HTMLPlug [options]\n\n";
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| 51 | print STDERR " options:\n";
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| 52 | print STDERR " -nolinks Don't make any attempt to trap links (setting this flag may\n";
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| 53 | print STDERR " improve speed of building/importing but any relative links within\n";
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| 54 | print STDERR " documents will be broken).\n";
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| 55 | print STDERR " -keep_head Don't remove headers from html files.\n";
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| 56 | print STDERR " -no_metadata Don't attempt to extract any metadata from files.\n";
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| 57 | print STDERR " -metadata_fields Comma separated list of metadata fields to attempt to extract.\n";
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| 58 | print STDERR " Defaults to 'Title'.\n";
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| 59 | print STDERR " Use `first200` to get the first 200 characters of the body.\n";
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| 60 | print STDERR " Use `H1` to get the text inside the first <H1> and </H1> tags in the text.\n";
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| 61 | print STDERR " -w3mir Set if w3mir was used to generate input file structure.\n";
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| 62 | print STDERR " -assoc_files Perl regular expression of file extensions to associate with\n";
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| 63 | print STDERR " html documents. Defaults to '(?i)\.(jpe?g|gif|png|css|pdf)\$'\n";
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| 64 | print STDERR " -rename_assoc_files Renames files associated with documents (e.g. images). Also\n";
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| 65 | print STDERR " creates much shallower directory structure (useful when creating\n";
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| 66 | print STDERR " collections to go on cd-rom).\n\n";
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| 67 | print STDERR " -title_sub Substitution expression to modify string stored as Title.\n";
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| 68 | print STDERR " Used by, for example, PDFHtml to remove Page 1 etc from text\n";
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| 69 | print STDERR " chosen to be used as the title.\n";
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| 70 | }
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| 71 |
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| 72 | sub new {
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| 73 | my $class = shift (@_);
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| 74 | my $self = new BasPlug ($class, @_);
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| 75 |
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| 76 | if (!parsargv::parse(\@_,
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| 77 | q^nolinks^, \$self->{'nolinks'},
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| 78 | q^keep_head^, \$self->{'keep_head'},
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| 79 | q^no_metadata^, \$self->{'no_metadata'},
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| 80 | q^metadata_fields/.*/Title^, \$self->{'metadata_fields'},
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| 81 | q^w3mir^, \$self->{'w3mir'},
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| 82 | q^assoc_files/.*/(?i)\.(jpe?g|gif|png|css|pdf)$^, \$self->{'assoc_files'},
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| 83 | q^rename_assoc_files^, \$self->{'rename_assoc_files'},
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| 84 | q^title_sub/.*/^, \$self->{'title_sub'},
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| 85 | "allow_extra_options")) {
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| 86 |
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| 87 | print STDERR "\nIncorrect options passed to HTMLPlug, check your collect.cfg configuration file\n";
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| 88 | &print_usage();
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| 89 | die "\n";
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| 90 | }
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| 91 |
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| 92 | $self->{'aux_files'} = {};
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| 93 | $self->{'dir_num'} = 0;
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| 94 | $self->{'file_num'} = 0;
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| 95 |
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| 96 | return bless $self, $class;
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| 97 | }
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| 98 |
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| 99 |
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| 100 | sub get_default_block_exp {
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| 101 | my $self = shift (@_);
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| 102 |
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| 103 | return q^(?i)\.(gif|jpe?g|png|pdf|rtf|css)$^;
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| 104 | }
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| 105 |
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| 106 | sub get_default_process_exp {
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| 107 | my $self = shift (@_);
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| 108 |
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| 109 | # the last option is an attempt to encode the concept of an html query ...
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| 110 | return q^(?i)(\.html?|\.shtml|\.shm|\.asp|\.php|\.cgi|.+\?.+=.*)$^;
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| 111 | }
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| 112 |
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| 113 |
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| 114 | # do plugin specific processing of doc_obj
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| 115 | sub process {
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| 116 | my $self = shift (@_);
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| 117 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj) = @_;
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| 118 | my $outhandle = $self->{'outhandle'};
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| 119 |
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| 120 | print $outhandle "HTMLPlug: processing $file\n"
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| 121 | if $self->{'verbosity'} > 1;
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| 122 |
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| 123 | my $cursection = $doc_obj->get_top_section();
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| 124 |
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| 125 | $self->extract_metadata ($textref, $metadata, $doc_obj, $cursection)
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| 126 | unless $self->{'no_metadata'};
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| 127 |
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| 128 | # Store URL for page as metadata - this can be used for an
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| 129 | # altavista style search interface. The URL won't be valid
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| 130 | # unless the file structure contains the domain name (i.e.
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| 131 | # like when w3mir is used to download a website).
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| 132 | my $web_url = "http://$file";
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| 133 | $web_url =~ s/\\/\//g; # for windows
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| 134 | $doc_obj->add_utf8_metadata($cursection, "URL", $web_url);
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| 135 |
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| 136 | # remove header and footer
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| 137 | if (!$self->{'keep_head'}) {
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| 138 | $$textref =~ s/^.*?<body[^>]*>//is;
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| 139 | $$textref =~ s/(<\/body[^>]*>|<\/html[^>]*>)//isg;
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| 140 | }
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| 141 |
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| 142 | # trap links
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| 143 | if (!$self->{'nolinks'}) {
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| 144 |
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| 145 | # usemap="./#index" not handled correctly => change to "#index"
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| 146 | $$textref =~ s/(<img[^>]*?usemap\s*=\s*\"?)([^\">\s]+)(\"?[^>]*>)/
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| 147 | $self->replace_usemap_links($1, $2, $3)/isge;
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| 148 |
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| 149 | $$textref =~ s/(<(?:a|area|frame|link)\s+[^>]*?\s*(?:href|src)\s*=\s*\"?)([^\">\s]+)(\"?[^>]*>)/
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| 150 | $self->replace_href_links ($1, $2, $3, $base_dir, $file, $doc_obj, $cursection)/isge;
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| 151 | }
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| 152 |
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| 153 | # trap images
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| 154 | $$textref =~ s/(<img[^>]*? src\s*=\s*\"?)([^\">\s]+)(\"?[^>]*>)/
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| 155 | $self->replace_images ($1, $2, $3, $base_dir, $file, $doc_obj, $cursection)/isge;
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| 156 |
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| 157 | # add text to document object
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| 158 | $doc_obj->add_utf8_text($cursection, $$textref);
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| 159 |
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| 160 | return 1;
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| 161 | }
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| 162 |
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| 163 | sub replace_images {
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| 164 | my $self = shift (@_);
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| 165 | my ($front, $link, $back, $base_dir,
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| 166 | $file, $doc_obj, $section) = @_;
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| 167 |
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| 168 | $link =~ s/\n/ /g;
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| 169 |
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| 170 | my ($href, $hash_part, $rl) = $self->format_link ($link, $base_dir, $file);
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| 171 | return $front . $self->add_file ($href, $rl, $hash_part, $base_dir, $doc_obj, $section) . $back;
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| 172 | }
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| 173 |
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| 174 | sub replace_href_links {
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| 175 | my $self = shift (@_);
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| 176 | my ($front, $link, $back, $base_dir, $file, $doc_obj, $section) = @_;
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| 177 |
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| 178 | # attempt to sort out targets - frames are not handled
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| 179 | # well in this plugin and some cases will screw things
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| 180 | # up - e.g. the _parent target (so we'll just remove
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| 181 | # them all ;-)
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| 182 | $front =~ s/(target=\"?)_top(\"?)/$1_gsdltop_$2/is;
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| 183 | $back =~ s/(target=\"?)_top(\"?)/$1_gsdltop_$2/is;
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| 184 | $front =~ s/target=\"?_parent\"?//is;
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| 185 | $back =~ s/target=\"?_parent\"?//is;
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| 186 |
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| 187 | return $front . $link . $back if $link =~ /^\#/s;
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| 188 | $link =~ s/\n/ /g;
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| 189 |
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| 190 | my ($href, $hash_part, $rl) = $self->format_link ($link, $base_dir, $file);
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| 191 | # href may use '\'s where '/'s should be on Windows
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| 192 | $href =~ s/\\/\//g;
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| 193 |
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| 194 | my ($filename) = $href =~ /^(?:.*?):(?:\/\/)?(.*)/;
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| 195 |
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| 196 | ##### leave all these links alone (they won't be picked up by intermediate
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| 197 | ##### pages). I think that's safest when dealing with frames, targets etc.
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| 198 | ##### (at least until I think of a better way to do it). Problems occur with
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| 199 | ##### mailto links from within small frames, the intermediate page is displayed
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| 200 | ##### within that frame and can't be seen. There is still potential for this to
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| 201 | ##### happen even with html pages - the solution seems to be to somehow tell
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| 202 | ##### the browser from the server side to display the page being sent (i.e.
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| 203 | ##### the intermediate page) in the top level window - I'm not sure if that's
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| 204 | ##### possible - the following line should probably be deleted if that can be done
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| 205 | return $front . $link . $back if $href =~ /^(mailto|news|gopher|nntp|telnet|javascript):/is;
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| 206 |
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| 207 |
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| 208 | if (($rl == 0) || ($filename =~ /$self->{'process_exp'}/) ||
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| 209 | ($href =~ /\/$/) || ($href =~ /^(mailto|news|gopher|nntp|telnet|javascript):/i)) {
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| 210 | &ghtml::urlsafe ($href);
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| 211 | return $front . "_httpextlink_&rl=" . $rl . "&href=" . $href . $hash_part . $back;
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| 212 |
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| 213 | } else {
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| 214 | # link is to some other type of file (image, pdf etc.) so we'll
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| 215 | # need to associate that file
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| 216 | return $front . $self->add_file ($href, $rl, $hash_part, $base_dir, $doc_obj, $section) . $back;
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| 217 | }
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| 218 | }
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| 219 |
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| 220 | sub add_file {
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| 221 | my $self = shift (@_);
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| 222 | my ($href, $rl, $hash_part, $base_dir, $doc_obj, $section) = @_;
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| 223 | my ($newname);
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| 224 |
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| 225 | my $filename = $href;
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| 226 | $filename =~ s/^[^:]*:\/\///;
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| 227 | $filename = &util::filename_cat($base_dir, $filename);
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| 228 |
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| 229 | my ($ext) = $filename =~ /(\.[^\.]*)$/;
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| 230 |
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| 231 | if ((!defined $ext) || ($ext !~ /$self->{'assoc_files'}/)) {
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| 232 | return "_httpextlink_&rl=" . $rl . "&href=" . $href . $hash_part;
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| 233 | }
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| 234 |
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| 235 | if ($self->{'rename_assoc_files'}) {
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| 236 | if (defined $self->{'aux_files'}->{$href}) {
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| 237 | $newname = $self->{'aux_files'}->{$href}->{'dir_num'} . "/" .
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| 238 | $self->{'aux_files'}->{$href}->{'file_num'} . $ext;
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| 239 | } else {
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| 240 | $newname = $self->{'dir_num'} . "/" . $self->{'file_num'} . $ext;
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| 241 | $self->{'aux_files'}->{$href} = {'dir_num' => $self->{'dir_num'}, 'file_num' => $self->{'file_num'}};
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| 242 | $self->inc_filecount ();
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| 243 | }
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| 244 | $doc_obj->associate_file($filename, $newname, undef, $section);
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| 245 | return "_httpcollimg_/$newname";
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| 246 |
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| 247 | } else {
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| 248 | ($newname) = $filename =~ /([^\/\\]*)$/;
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| 249 | $doc_obj->associate_file($filename, $newname, undef, $section);
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| 250 | return "_httpdocimg_/$newname";
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| 251 | }
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| 252 | }
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| 253 |
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| 254 |
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| 255 | sub format_link {
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| 256 | my $self = shift (@_);
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| 257 | my ($link, $base_dir, $file) = @_;
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| 258 |
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| 259 | my ($before_hash, $hash_part) = $link =~ /^([^\#]*)(\#?.*)$/;
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| 260 | $hash_part = "" if !defined $hash_part;
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| 261 | if (!defined $before_hash || $before_hash !~ /[\w\.\/]/) {
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| 262 | my $outhandle = $self->{'outhandle'};
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| 263 | print $outhandle "HTMLPlug: ERROR - badly formatted tag ignored ($link)\n"
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| 264 | if $self->{'verbosity'};
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| 265 | return ($link, "", 0);
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| 266 | }
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| 267 |
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| 268 | if ($before_hash =~ s/^((?:http|ftp|file):\/\/)//i) {
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| 269 | my $type = $1;
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| 270 |
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| 271 | if ($link =~ /^(http|ftp):/i) {
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| 272 | # Turn url (using /) into file name (possibly using \ on windows)
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| 273 | my @http_dir_split = split('/', $before_hash);
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| 274 | $before_hash = &util::filename_cat(@http_dir_split);
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| 275 | }
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| 276 |
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| 277 | $before_hash = $self->eval_dir_dots($before_hash);
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| 278 |
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| 279 | my $linkfilename = &util::filename_cat ($base_dir, $before_hash);
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| 280 |
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| 281 | my $rl = 0;
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| 282 | $rl = 1 if (-e $linkfilename);
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| 283 |
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| 284 | # make sure there's a slash on the end if it's a directory
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| 285 | if ($before_hash !~ /\/$/) {
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| 286 | $before_hash .= "/" if (-d $linkfilename);
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| 287 | }
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| 288 |
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| 289 | return ($type . $before_hash, $hash_part, $rl);
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| 290 |
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| 291 | } elsif ($link !~ /^(mailto|news|gopher|nntp|telnet|javascript):/i) {
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| 292 |
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| 293 | if ($before_hash =~ s/^\///) {
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| 294 | # the first directory will be the domain name if w3mir was used
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| 295 | # to generate archives, otherwise we'll assume all files are
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| 296 | # from the same site and base_dir is the root
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| 297 | if ($self->{'w3mir'}) {
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| 298 | my @dirs = split /[\/\\]/, $file;
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| 299 | my $domname = shift (@dirs);
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| 300 | $before_hash = &util::filename_cat($domname, $before_hash);
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| 301 | $before_hash =~ s/\\/\//g; # for windows
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| 302 | }
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| 303 | else
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| 304 | {
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| 305 | # see if link shares directory with source document
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| 306 | # => turn into relative link if this is so!
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| 307 | my $before_hash_fix = &util::filename_cat("",$before_hash);
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| 308 | $before_hash_fix =~ s/^$base_dir(\\|\/)//;
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| 309 | $before_hash = $before_hash_fix;
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| 310 |
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| 311 | }
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| 312 |
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| 313 |
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| 314 | } else {
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| 315 | # Turn relative file path into full path
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| 316 | my $dirname = &File::Basename::dirname($file);
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| 317 | $before_hash = &util::filename_cat($dirname, $before_hash);
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| 318 | $before_hash = $self->eval_dir_dots($before_hash);
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| 319 | }
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| 320 |
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| 321 |
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| 322 | my $linkfilename = &util::filename_cat ($base_dir, $before_hash);
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| 323 |
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| 324 | # make sure there's a slash on the end if it's a directory
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| 325 | if ($before_hash !~ /\/$/) {
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| 326 | $before_hash .= "/" if (-d $linkfilename);
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| 327 | }
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| 328 |
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| 329 | return ("http://" . $before_hash, $hash_part, 1);
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| 330 |
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| 331 | } else {
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| 332 | # mailto, news, nntp, telnet, javascript or gopher link
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| 333 | return ($before_hash, "", 0);
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| 334 | }
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| 335 | }
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| 336 |
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| 337 | sub extract_metadata {
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| 338 | my $self = shift (@_);
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| 339 | my ($textref, $metadata, $doc_obj, $section) = @_;
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| 340 |
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| 341 | return if (!defined $self->{'metadata_fields'});
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| 342 |
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| 343 | foreach my $field (split /,/, $self->{'metadata_fields'}) {
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| 344 |
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| 345 | # don't need to extract field if it was passed in from a previous
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| 346 | # (recursive) plugin
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| 347 | next if defined $metadata->{$field};
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| 348 |
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| 349 | # see if there's a <meta> tag for this field
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| 350 | if ($$textref =~ /<meta(.*?)(?:name|http-equiv)\s*=\s*\"?$field\"?([^>]*)/is) {
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| 351 | my $content = $1 . $2;
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| 352 | if ($content =~ /content\s*=\s*\"?(.*?)\"?/is) {
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| 353 | if (defined $1) {
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| 354 | my $value = $1;
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| 355 | $value =~ s/\s+/ /gs;
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| 356 | $doc_obj->add_utf8_metadata($section, $field, $value);
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| 357 | next;
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| 358 | }
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| 359 | }
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| 360 | }
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| 361 |
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| 362 | # TITLE: extract the document title
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| 363 |
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| 364 | if ($field =~ /^title$/i) {
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| 365 |
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| 366 | # see if there's a <title> tag
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| 367 | if ($$textref =~ /<title[^>]*>([^<]*)<\/title[^>]*>/is) {
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| 368 | if (defined $1) {
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| 369 | my $title = $1;
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| 370 | if ($title =~ /\w/) {
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| 371 | $title =~ s/\s+/ /gs;
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| 372 | $title =~ s/^\s+//;
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| 373 | $title =~ s/\s+$//;
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| 374 | $doc_obj->add_utf8_metadata ($section, $field, $title);
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| 375 | next;
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| 376 | }
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| 377 | }
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| 378 | }
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| 379 |
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| 380 | # if no title use first 100 characters
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| 381 | my $tmptext = $$textref;
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| 382 | $tmptext =~ s/\s+/ /gs;
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| 383 | $tmptext =~ s/$self->{'title_sub'}// if (defined $self->{'title_sub'});
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| 384 | $tmptext =~ s/<[^>]*>//g;
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| 385 | $tmptext = substr ($tmptext, 0, 100);
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| 386 | $tmptext =~ s/^\s+//;
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| 387 | $tmptext =~ s/\s+$//;
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| 388 | $tmptext =~ s/\s\S*$/.../;
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| 389 | $doc_obj->add_utf8_metadata ($section, $field, $tmptext);
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| 390 | next;
|
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| 391 | }
|
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| 392 |
|
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| 393 | # FIRST200: extract the first 200 characters as metadata
|
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| 394 |
|
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| 395 | if ($field =~ /^first200$/i) {
|
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| 396 | my $tmptext = $$textref;
|
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| 397 | $tmptext =~ s/\s+/ /gs;
|
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| 398 | $tmptext =~ s/.*<body[^>]*>//i;
|
|---|
| 399 | $tmptext =~ s/$self->{'title_sub'}// if (defined $self->{'title_sub'});
|
|---|
| 400 | $tmptext =~ s/<[^>]*>//g;
|
|---|
| 401 | $tmptext = substr ($tmptext, 0, 200);
|
|---|
| 402 | $tmptext =~ s/^\s+//;
|
|---|
| 403 | $tmptext =~ s/\s+$//;
|
|---|
| 404 | $tmptext =~ s/\s\S*$/.../;
|
|---|
| 405 | $doc_obj->add_utf8_metadata ($section, $field, $tmptext);
|
|---|
| 406 | next;
|
|---|
| 407 | }
|
|---|
| 408 |
|
|---|
| 409 | # H1: extract the text between the first <H1> and </H1> tags
|
|---|
| 410 | if ($field =~ /^H1$/i) {
|
|---|
| 411 | my $tmptext = $$textref;
|
|---|
| 412 | $tmptext =~ s/\s+/ /gs;
|
|---|
| 413 | if ($tmptext =~ /<H1[^>]*>/i) {
|
|---|
| 414 | $tmptext =~ s/.*<H1[^>]*>//i;
|
|---|
| 415 | $tmptext =~ s/<\/H1[^>]*>.*//i;
|
|---|
| 416 | $tmptext =~ s/^\s+//;
|
|---|
| 417 | $tmptext =~ s/\s+$//;
|
|---|
| 418 | $doc_obj->add_utf8_metadata ($section, $field, $tmptext);
|
|---|
| 419 | }
|
|---|
| 420 | next;
|
|---|
| 421 | }
|
|---|
| 422 | }
|
|---|
| 423 | }
|
|---|
| 424 |
|
|---|
| 425 |
|
|---|
| 426 | # evaluate any "../" to next directory up
|
|---|
| 427 | # evaluate any "./" as here
|
|---|
| 428 | sub eval_dir_dots {
|
|---|
| 429 | my $self = shift (@_);
|
|---|
| 430 | my ($filename) = @_;
|
|---|
| 431 |
|
|---|
| 432 | my $dirsep_os = &util::get_os_dirsep();
|
|---|
| 433 | my @dirsep = split(/$dirsep_os/,$filename);
|
|---|
| 434 |
|
|---|
| 435 | my @eval_dirs = ();
|
|---|
| 436 | foreach my $d (@dirsep) {
|
|---|
| 437 | if ($d eq "..") {
|
|---|
| 438 | pop(@eval_dirs);
|
|---|
| 439 |
|
|---|
| 440 | } elsif ($d eq ".") {
|
|---|
| 441 | # do nothing!
|
|---|
| 442 |
|
|---|
| 443 | } else {
|
|---|
| 444 | push(@eval_dirs,$d);
|
|---|
| 445 | }
|
|---|
| 446 | }
|
|---|
| 447 |
|
|---|
| 448 | return &util::filename_cat(@eval_dirs);
|
|---|
| 449 | }
|
|---|
| 450 |
|
|---|
| 451 | sub replace_usemap_links {
|
|---|
| 452 | my $self = shift (@_);
|
|---|
| 453 | my ($front, $link, $back) = @_;
|
|---|
| 454 |
|
|---|
| 455 | $link =~ s/^\.\///;
|
|---|
| 456 | return $front . $link . $back;
|
|---|
| 457 | }
|
|---|
| 458 |
|
|---|
| 459 | sub inc_filecount {
|
|---|
| 460 | my $self = shift (@_);
|
|---|
| 461 |
|
|---|
| 462 | if ($self->{'file_num'} == 1000) {
|
|---|
| 463 | $self->{'dir_num'} ++;
|
|---|
| 464 | $self->{'file_num'} = 0;
|
|---|
| 465 | } else {
|
|---|
| 466 | $self->{'file_num'} ++;
|
|---|
| 467 | }
|
|---|
| 468 | }
|
|---|
| 469 |
|
|---|
| 470 | 1;
|
|---|
