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|
#!/usr/bin/perl
use strict;
use warnings;
use Storable qw(retrieve);
use Encode qw(decode_utf8);
use HTML::Escape qw(escape_html);
# Configuration
my $max_parallel = 50; # max no. of parallel searches
my $lock_timeout = 30; # drop stale locks after this many seconds
my $max_results = 20; # max search results
my $min_query_len = 3; # min query length to avoid matching 'a', 'e'
my $index_file = 'search_index.dat'; # index file
my $lock_dir = '/tmp/search_locks'; # lock file directory
# Concurrency control
mkdir $lock_dir, 0777 unless -d $lock_dir;
my $active_count = 0;
my $now = time();
opendir(my $dh, $lock_dir);
while (my $file = readdir($dh)) {
next unless $file =~ /\.lock$/;
my $path = "$lock_dir/$file";
my $mtime = (stat($path))[9] || 0;
( $now - $mtime > $lock_timeout ) ? unlink($path) : $active_count++;
}
closedir($dh);
# Too many search requests
if ($active_count >= $max_parallel) {
print "Content-Type: text/html\n\n";
render_html("<p>Server busy. Please try again in a few seconds.</p>", "", (localtime)[5]+1900);
exit;
}
my $lock_file = "$lock_dir/$$.lock";
open(my $fh_lock, '>', $lock_file);
# Decode search text as utf-8, toss non-printable chars, trim
my $search_text = '';
if (($ENV{QUERY_STRING} || '') =~ /^q=([^&]*)/) {
$search_text = decode_utf8($1 // "");
$search_text =~ s/\P{Print}//g;
$search_text = substr($search_text, 0, 64);
$search_text =~ s/^\s+|\s+$//g;
}
# Pre-prepare common template variables
my $safe_search_text = escape_html($search_text);
my $year = (localtime)[5] + 1900;
print "Content-Type: text/html\n\n";
# Input validation
if ($search_text eq '') {
final_output("<p>Please enter a search term above.</p>");
}
if (length($search_text) < $min_query_len) {
final_output("<p>Search term is too short. Please enter at least $min_query_len characters.</p>");
}
if (!-f $index_file) {
final_output("<p>Search temporarily unavailable.</p>");
}
my $index = retrieve($index_file);
my @results;
my $found = 0;
foreach my $url (sort keys %$index) {
last if $found >= $max_results;
my $data = $index->{$url};
# Grab 80 char snippet to chop at a word boundary later
next unless $data->{c} =~ /(.{0,40})(\Q$search_text\E)(.{0,40})/is;
my ($before, $actual, $after) = ($1, $2, $3);
$found++;
# Chop at 25 or word boundary
$after =~ s/\s\S*$// if length($after) > 25;
$before =~ s/^.*?\s// if length($before) > 25;
$before = ($before =~ /\S/) ? ucfirst($before) : "";
$actual = ($before eq "") ? ucfirst($actual) : $actual;
my $snippet = escape_html($before) . "<b>" . escape_html($actual) . "</b>" . escape_html($after) . "...";
push @results, {
path => $url,
title => escape_html($data->{t}),
snippet => $snippet
};
}
# Format results list
my $list_html = "";
if (@results == 0) {
$list_html = "<p>No results found for \"<b>$safe_search_text</b>\".</p>";
} else {
$list_html = "<ul>" . join('', map {
"<li><a href=\"/$_->{path}\">$_->{title}</a><br><small>$_->{snippet}</small></li>"
} @results) . "</ul>";
}
final_output($list_html);
# Helper to ensure layout is always preserved
sub final_output {
my ($content) = @_;
render_html($content, $safe_search_text, $year);
close($fh_lock) if $fh_lock;
unlink($lock_file) if -f $lock_file;
exit;
}
sub render_html {
my ($content, $q_val, $yr) = @_;
print <<"HTML";
<!DOCTYPE html>
<html lang="en-us">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Search</title>
<link rel="stylesheet" href="/assets/css/main.css">
<link rel="stylesheet" href="/assets/css/skeleton.css">
</head>
<body>
<div id="nav-container" class="container">
<ul id="navlist" class="left">
<li><a href="/" class="link-decor-none">hme</a></li>
<li><a href="/log/" class="link-decor-none">log</a></li>
<li><a href="/projects/" class="link-decor-none">poc</a></li>
<li><a href="/about/" class="link-decor-none">abt</a></li>
<li class="active"><a href="/cgi-bin/find.cgi" class="link-decor-none">sws</a></li>
<li><a href="/feed.xml" class="link-decor-none">rss</a></li>
</ul>
</div>
<main class="container" id="main">
<div class="container">
<h2>Search</h2>
<form action="" method="GET">
<input id="search-box" type="text" name="q" value="$q_val">
<input id="search-btn" type="submit" value="Search">
</form>
$content
</div>
</main>
<div class="footer">
<div class="container">
<div class="twelve columns right container-2">
<p id="footer-text">© ASCIIMX - $yr</p>
</div>
</div>
</div>
</body>
</html>
HTML
}
|
