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 " or .rtf 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\n";
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72 | }
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73 |
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74 | sub new {
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75 | my $class = shift (@_);
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76 | my $self = new BasPlug ();
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77 |
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78 | if (!parsargv::parse(\@_,
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79 | q^process_exp/.*/(?i)\.html?$^, \$self->{'process_exp'},
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80 | q^nolinks^, \$self->{'nolinks'},
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81 | q^block_exp/.*/(?i)\.(gif|jpe?g|png|pdf|rtf)$^, \$self->{'block_exp'},
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82 | q^keep_head^, \$self->{'keep_head'},
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83 | q^no_metadata^, \$self->{'no_metadata'},
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84 | q^metadata_fields/.*/Title^, \$self->{'metadata_fields'},
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85 | q^w3mir^, \$self->{'w3mir'})) {
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86 | &print_usage();
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87 | die "\n";
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88 | }
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89 |
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90 | $self->{'aux_files'} = {};
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91 | $self->{'dir_num'} = 0;
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92 | $self->{'file_num'} = 0;
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93 |
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94 | return bless $self, $class;
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95 | }
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96 |
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97 | sub is_recursive {
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98 | my $self = shift (@_);
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99 |
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100 | return 0; # this is not a recursive plugin
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101 | }
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102 |
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103 | # return number of files processed, undef if can't process
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104 | # Note that $base_dir might be "" and that $file might
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105 | # include directories
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106 | sub read {
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107 | my $self = shift (@_);
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108 | my ($pluginfo, $base_dir, $file, $metadata, $processor) = @_;
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109 |
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110 | my $filename = &util::filename_cat($base_dir, $file);
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111 | return 0 if $filename =~ /$self->{'block_exp'}/;
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112 | if ($filename !~ /$self->{'process_exp'}/ || !-f $filename) {
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113 | return undef;
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114 | }
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115 | $file =~ s/^[\/\\]+//;
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116 |
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117 | $self->{'verbosity'} = $processor->{'verbosity'};
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118 | print STDERR "HTMLPlug: processing $file\n"
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119 | if $self->{'verbosity'} > 1;
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120 |
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121 | # create a new document
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122 | my $doc_obj = new doc ($file, "indexed_doc");
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123 | my $cursection = $doc_obj->get_top_section();
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124 |
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125 | # read in HTML file
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126 | open (FILE, $filename) || die "HTMLPlug::read - can't open $filename\n";
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127 | undef $/;
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128 | my $text = <FILE>;
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129 | $/ = "\n";
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130 | close FILE;
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131 | if ($text !~ /\w/) {
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132 | print STDERR "HTMLPlug: ERROR: $file contains no text\n" if $self->{'verbosity'};
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133 | return 0;
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134 | }
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135 |
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136 | $self->extra_metadata ($doc_obj, $cursection, $metadata);
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137 | $self->extract_metadata (\$text, $metadata, $doc_obj, $cursection)
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138 | unless $self->{'no_metadata'};
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139 |
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140 | # Store URL for page as metadata - this can be used for an
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141 | # altavista style search interface. The URL won't be valid
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142 | # unless the file structure contains the domain name (i.e.
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143 | # like when w3mir is used to download a website).
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144 | my $web_url = "http://$file";
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145 | $web_url =~ s/\\/\//g; # for windows
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146 | $doc_obj->add_metadata($cursection, "URL", $web_url);
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147 |
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148 | # remove header and footer
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149 | if (!$self->{'keep_head'}) {
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150 | $text =~ s/^.*?<body[^>]*>//is;
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151 | $text =~ s/(<\/body[^>]*>|<\/html[^>]*>)//isg;
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152 | }
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153 |
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154 | # trap links
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155 | if (!$self->{'nolinks'}) {
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156 |
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157 | # usemap="./#index" not handled correctly => change to "#index"
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158 | $text =~ s/(<img[^>]*?usemap\s*=\s*\"?)([^\">\s]+)(\"?[^>]*>)/
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159 | $self->replace_usemap_links($1, $2, $3)/isge;
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160 |
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161 | $text =~ s/(<(?:a|area|frame)\s+[^>]*?(?:href|src)\s*=\s*\"?)([^\">\s]+)(\"?[^>]*>)/
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162 | $self->replace_href_links ($1, $2, $3, $base_dir, $file, $doc_obj)/isge;
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163 | }
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164 |
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165 | # trap images
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166 | $text =~ s/(<img[^>]*?src\s*=\s*\"?)([^\">\s]+)(\"?[^>]*>)/
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167 | $self->replace_images ($1, $2, $3, $base_dir, $file, $doc_obj)/isge;
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168 |
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169 | $doc_obj->add_text ($cursection, $text);
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170 |
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171 | # add an OID
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172 | $doc_obj->set_OID();
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173 |
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174 | # process the document
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175 | $processor->process($doc_obj);
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176 |
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177 | return 1; # processed the file
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178 | }
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179 |
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180 | sub replace_images {
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181 | my $self = shift (@_);
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182 | my ($front, $link, $back, $base_dir, $file, $doc_obj) = @_;
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183 |
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184 | $link =~ s/\n/ /g;
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185 |
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186 | my ($href, $hash_part, $rl) = $self->format_link ($link, $base_dir, $file);
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187 | return $front . $self->add_file ($href, $base_dir, $doc_obj) . $back;
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188 | }
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189 |
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190 | sub replace_href_links {
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191 | my $self = shift (@_);
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192 | my ($front, $link, $back, $base_dir, $file, $doc_obj) = @_;
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193 |
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194 | # attempt to sort out targets - frames are not handled
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195 | # well in this plugin and some cases will screw things
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196 | # up - e.g. the _parent target (so we'll just remove
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197 | # them all ;-)
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198 | $front =~ s/(target=\"?)_top(\"?)/$1_gsdltop_$2/is;
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199 | $back =~ s/(target=\"?)_top(\"?)/$1_gsdltop_$2/is;
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200 | $front =~ s/target=\"?_parent\"?//is;
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201 | $back =~ s/target=\"?_parent\"?//is;
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202 |
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203 | return $front . $link . $back if $link =~ /^\#/s;
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204 | $link =~ s/\n/ /g;
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205 |
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206 | my ($href, $hash_part, $rl) = $self->format_link ($link, $base_dir, $file);
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207 |
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208 | my ($filename) = $href =~ /^(?:.*?):(?:\/\/)?(.*)/;
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209 | if (($rl == 0) || ($filename =~ /$self->{'process_exp'}/) ||
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210 | ($href =~ /\/$/) || ($href =~ /^(mailto|news|gopher|nntp|telnet|javascript):/i)) {
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211 | $link = $href . $hash_part;
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212 | &html::urlsafe ($link);
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213 | return $front . "_httpextlink_&href=" . $link . "&rl=" . $rl . $back;
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214 |
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215 | } else {
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216 | # link is to some other type of file (image, pdf etc.) so we'll
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217 | # need to associate that file
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218 | return $front . $self->add_file ($href, $base_dir, $doc_obj) . $back;
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219 | }
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220 | }
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221 |
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222 | sub add_file {
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223 | my $self = shift (@_);
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224 | my ($href, $base_dir, $doc_obj) = @_;
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225 | my ($newname);
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226 |
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227 | my $filename = $href;
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228 | $filename =~ s/^[^:]*:\/\///;
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229 | $filename = &util::filename_cat ($base_dir, $filename);
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230 | my ($ext) = $filename =~ /(\.[^\.]*)$/;
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231 | if (defined $self->{'aux_files'}->{$href}) {
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232 | $newname = $self->{'aux_files'}->{$href}->{'dir_num'} . "/" .
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233 | $self->{'aux_files'}->{$href}->{'file_num'} . $ext;
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234 | } else {
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235 | $newname = $self->{'dir_num'} . "/" . $self->{'file_num'} . $ext;
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236 | $self->inc_filecount ();
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237 | }
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238 | $doc_obj->associate_file($filename, $newname);
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239 | return "_httpcollimg_/$newname";
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240 | }
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241 |
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242 |
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243 | sub format_link {
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244 | my $self = shift (@_);
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245 | my ($link, $base_dir, $file) = @_;
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246 |
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247 | my ($before_hash, $hash_part) = $link =~ /^([^\#]*)(\#?.*)$/;
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248 | $hash_part = "" if !defined $hash_part;
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249 | if (!defined $before_hash || $before_hash !~ /[\w\.\/]/) {
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250 | print STDERR "HTMLPlug: ERROR - badly formatted tag ignored ($link)\n"
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251 | if $self->{'verbosity'};
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252 | return ($link, "", 0);
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253 | }
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254 |
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255 | if ($before_hash =~ s/^((?:http|ftp|file):\/\/)//i) {
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256 | my $type = $1;
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257 |
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258 | if ($link =~ /^(http|ftp):/i) {
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259 | # Turn url (using /) into file name (possibly using \ on windows)
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260 | my @http_dir_split = split('/', $before_hash);
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261 | $before_hash = &util::filename_cat(@http_dir_split);
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262 | }
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263 |
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264 | $before_hash = $self->eval_dir_dots($before_hash);
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265 |
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266 | my $linkfilename = &util::filename_cat ($base_dir, $before_hash);
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267 |
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268 | my $rl = 0;
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269 | $rl = 1 if (-e $linkfilename);
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270 |
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271 | # make sure there's a slash on the end if it's a directory
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272 | if ($before_hash !~ /\/$/) {
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273 | $before_hash .= "/" if (-d $linkfilename);
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274 | }
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275 |
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276 | return ($type . $before_hash, $hash_part, $rl);
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277 |
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278 | } elsif ($link !~ /^(mailto|news|gopher|nntp|telnet|javascript):/i) {
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279 |
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280 | if ($before_hash =~ s/^\///) {
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281 | # the first directory will be the domain name if w3mir was used
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282 | # to generate archives, otherwise we'll assume all files are
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283 | # from the same site and base_dir is the root
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284 | if ($self->{'w3mir'}) {
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285 | my @dirs = split /[\/\\]/, $file;
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286 | my $domname = shift (@dirs);
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287 | $before_hash = &util::filename_cat($domname, $before_hash);
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288 | $before_hash =~ s/\\/\//g; # for windows
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289 | }
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290 |
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291 | } else {
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292 | # Turn relative file path into full path
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293 | my $dirname = &File::Basename::dirname($file);
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294 | $before_hash = &util::filename_cat($dirname, $before_hash);
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295 | $before_hash = $self->eval_dir_dots($before_hash);
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296 | }
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297 |
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298 | # make sure there's a slash on the end if it's a directory
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299 | my $linkfilename = &util::filename_cat ($base_dir, $before_hash);
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300 | if ($before_hash !~ /\/$/) {
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301 | $before_hash .= "/" if (-d $linkfilename);
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302 | }
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303 |
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304 | return ("http://" . $before_hash, $hash_part, 1);
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305 |
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306 | } else {
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307 | # mailto, news, nntp, telnet, javascript or gopher link
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308 | return ($before_hash, "", 0);
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309 | }
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310 | }
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311 |
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312 | sub extract_metadata {
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313 | my $self = shift (@_);
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314 | my ($textref, $metadata, $doc_obj, $section) = @_;
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315 |
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316 | foreach my $field (split /,/, $self->{'metadata_fields'}) {
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317 |
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318 | # don't need to extract field if it was passed in from a previous
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319 | # (recursive) plugin
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320 | next if defined $metadata->{$field};
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321 |
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322 | # see if there's a <meta> tag for this field
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323 | if ($$textref =~ /<meta(.*?)(?:name|http-equiv)\s*=\s*\"?$field\"?([^>]*)/is) {
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324 | my $content = $1 . $2;
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325 | if ($content =~ /content\s*=\s*\"?(.*?)\"?/is) {
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326 | if (defined $1) {
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327 | my $value = $1;
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328 | $value =~ s/\s+/ /gs;
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329 | $doc_obj->add_metadata($section, $field, $value);
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330 | next;
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331 | }
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332 | }
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333 | }
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334 |
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335 | # special case for Title metadata - try <title> tags
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336 | # then first 100 characters of text
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337 |
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338 | if ($field =~ /^title$/i) {
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339 |
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340 | # see if there's a <title> tag
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341 | if ($$textref =~ /<title[^>]*>([^<]*)<\/title[^>]*>/is) {
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342 | if (defined $1) {
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343 | my $title = $1;
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344 | if ($title =~ /\w/) {
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345 | $title =~ s/\s+/ /gs;
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346 | $doc_obj->add_metadata ($section, $field, $title);
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347 | next;
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348 | }
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349 | }
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350 | }
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351 |
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352 | # if no title use first 100 characters
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353 | my $tmptext = $$textref;
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354 | $tmptext =~ s/<[^>]*>//g;
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355 | my $title = substr ($tmptext, 0, 100);
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356 | $title =~ s/\s+/ /gs;
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357 | $doc_obj->add_metadata ($section, $field, $title);
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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 | # evaluate any "../" to next directory up
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363 | # evaluate any "./" as here
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364 | sub eval_dir_dots {
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365 | my $self = shift (@_);
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366 | my ($filename) = @_;
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367 |
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368 | my $dirsep_os = &util::get_os_dirsep();
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369 | my @dirsep = split(/$dirsep_os/,$filename);
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370 |
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371 | my @eval_dirs = ();
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372 | foreach my $d (@dirsep) {
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373 | if ($d eq "..") {
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374 | pop(@eval_dirs);
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375 |
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376 | } elsif ($d eq ".") {
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377 | # do nothing!
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378 |
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379 | } else {
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380 | push(@eval_dirs,$d);
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381 | }
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382 | }
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383 |
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384 | return &util::filename_cat(@eval_dirs);
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385 | }
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386 |
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387 | sub replace_usemap_links {
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388 | my $self = shift (@_);
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389 | my ($front, $link, $back) = @_;
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390 |
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391 | $link =~ s/^\.\///;
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392 | return $front . $link . $back;
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393 | }
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394 |
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395 | sub inc_filecount {
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396 | my $self = shift (@_);
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397 |
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398 | if ($self->{'file_num'} == 1000) {
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399 | $self->{'dir_num'} ++;
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400 | $self->{'file_num'} = 0;
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401 | } else {
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402 | $self->{'file_num'} ++;
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403 | }
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404 | }
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405 |
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406 | 1;
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