/usr/lib/swish++/WWW.pm is in swish++ 6.1.5-2.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# WWW.pm: World Wide Web package
#
# Copyright (C) 1996 Paul J. Lucas
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
##
package WWW;
use Exporter();
@ISA = qw( Exporter );
@EXPORT = qw(
$description::chars
$description::words
extract_description
extract_meta
hyperlink
);
sub private_extract {
my $path_name = shift;
if ( $path_name ne $extract::path_name ) {
open( FILE, $path_name ) or die "can not open $path_name\n";
read( FILE, $extract::text, $description::chars );
close FILE;
$extract::text =~ s/\s+/ /g; # turn into one big long string
$extract::path_name = $path_name;
}
}
###############################################################################
#
# SYNOPSIS
#
sub extract_description
#
# DESCRIPTION
#
# Extract a description from a file by looking at an initial chunk of
# text. If the file is HTML and it has a META description (or Dublin
# Code DC.description) tag, use that description. Also extract text
# from ALT attributes. Strip all HTML tags and return the number of
# words requested.
#
# SEE ALSO
#
# Dave Raggett, Arnaud Le Hors, and Ian Jacobs. "Notes on helping
# search engines index your Web site," HTML 4.0 Specification, Appendix
# B: "Performance, Implementation, and Design Notes," World Wide Web
# Consortium, April 1998.
# http://www.w3.org/TR/REC-html40/appendix/notes.html#recs
#
# ---. "Objects, Images, and Applets: How to specify alternate text,"
# HTML 4.0 Specification, section 13.8, World Wide Web Consortium,
# April 1998.
# http://www.w3.org/TR/REC-html40/struct/objects.html#h-13.8
#
# Dublin Core Directorate. "The Dublin Core: A Simple Content
# Description Model for Electronic Resources."
# http://purl.oclc.org/dc/
#
###############################################################################
{
my $path_name = shift;
private_extract( $path_name );
my $s = $extract::text;
for ( $extract::path_name ) {
/\.[a-z]?html?$/i && do { # file is HTML
my $m = extract_meta( $extract::path_name, 'description' );
return $m if $m;
$m = extract_meta( $extract::path_name, 'DC.description' );
return $m if $m;
# Zap HTML comments and a partial, trailing comment, if any.
$s =~ s/<!--.*?-->//g;
$s =~ s/<!--.*\s*$//;
# Zap text between SCRIPT, STYLE, and TITLE tags and partial,
# trailing tag, if any.
$s =~ s!<(SCRIPT|STYLE|TITLE).*?>.*?</\1>!!gi;
$s =~ s/<(?:SCRIPT|STYLE|TITLE).*$//i;
# Extract text from ALT attributes of tags and partial,
# trailing tag, if any.
$s =~ s/<[^>]+?ALT\s*=\s*(['"])([^>]*?)\1[^>]*?>/$2/gi;
$s =~ s/<[^>]+?ALT\s*=\s*(['"])([^'"]*)\1?\s*$/$2/i;
# Zap all remaining HTML tags and partial, trailing tag, if any.
$s =~ s/<.*?>//g;
$s =~ s/<.*$//;
# no last;
};
/\.(?:[a-z]?html?|txt)$/i && do { # file is plain text or HTML
# Zap leading whitespace.
$s =~ s/^\s+//;
# Return at most $description::words words.
$s =~ s/^((?:\S+\s+){$description::words}).*/$1/;
last;
};
/./ && do { # file is neither text nor HTML
$s = '';
};
}
return $s;
}
###############################################################################
#
# SYNOPSIS
#
sub extract_meta
#
# DESCRIPTION
#
# For an HTML file, extract the value of the CONTENT attribute from a
# META element having the given NAME attribute by looking at an initial
# chunk of text for META elements in general. If no META element is
# found having the given NAME element, return null.
#
# The chunk of text is cached between calls for a given filename.
#
###############################################################################
{
my( $path_name, $meta_name ) = @_;
private_extract( $path_name );
if ( $extract::path_name =~ /\.[a-z]?html?$/i ) { # file is HTML
# If a <META NAME=$meta_name CONTENT="...">, return content.
return $3 if $extract::text =~ /<META\s[^>]*?NAME\s*=\s*(['"])?$meta_name\1?\s[^>]*?CONTENT\s*=\s*(['"])([^>]+)\2[^>]*?>/i;
# If a <META CONTENT="..." NAME=$meta_name>, return content.
return $2 if $extract::text =~ /<META\s[^>]*?CONTENT\s*=\s*(['"])([^>]+)\1\s[^>]*?NAME\s*=\s*(?:['"])?${meta_name}[^>]*?>/i;
}
return '';
}
###############################################################################
#
# SYNOPSIS
#
sub hyperlink
#
# DESCRIPTION
#
# Make valid URLs embedded in the text selectable by wrapping hyperlinks
# around them.
#
###############################################################################
{
for ( @_ ) {
s/</\</g; # translate problematic HTML...
s/>/\>/g; # ...characters first
s!$url_syntax{ ftp }!<A HREF="$&">$&</A>!g;
s!$url_syntax{ gopher }!<A HREF="$&">$&</A>!g;
s!$url_syntax{ http }!<A HREF="$&">$&</A>!g;
s!$url_syntax{ e_mail }!<A HREF="mailto:$&">$&</A>!g;
s!$url_syntax{ news }!<A HREF="$&">$&</A>!g;
s!$url_syntax{ telnet }!<A HREF="$&">$&</A>!g;
s!$url_syntax{ wais }!<A HREF="$&">$&</A>!g;
}
}
BEGIN {
##### URL syntax ######################################################
# Tim Berners-Lee. "RFC 1630: Universal Resource Identifiers in WWW,"
# Network Working Group of the Internet Engineering Task Force, June
# 1994.
# common sub-parts
my $url_user_password = '(?:[a-zA-Z][-\w.]+(?::\w+)?@)?';
my $url_host = '\w[-\w.]*\w';
my $url_port = '(?::\d+)?';
my $url_path = '(?:[-%/\w.~]*[-%/\w~])?';
my $url_query = '(?:\?[-!$%&\'()*+,./\w=?~]+)?';
$url_syntax{ ftp } =
"ftp://$url_user_password$url_host$url_port$url_path";
$url_syntax{ gopher } =
"gopher://$url_host$url_port$url_path";
$url_syntax{ http } =
"https?://$url_host$url_port$url_path$url_query";
$url_syntax{ e_mail } = '[a-zA-Z][-\w.]+@(?:[-\w]+\.)+[a-zA-Z]{2,3}';
$url_syntax{ mailto } = "mailto:$url_syntax{ e_mail }";
$url_syntax{ news } = 'news:[a-z][-\w.]*\w';
$url_syntax{ telnet } =
"telnet://$url_user_password$url_host$url_port";
$url_syntax{ wais } =
"wais://$url_host$url_port$url_path$url_query";
##### Miscellaneous ###################################################
$description::chars = 2048;
$description::words = 50;
}
1;
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