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web-ballot.pl: New script

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This commit is contained in:
Petr Baudis 2014-10-08 22:51:33 +02:00
parent f068590866
commit a6101aa02a
2 changed files with 143 additions and 2 deletions
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16
README.md
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@ -1,3 +1,15 @@
Example:
Generating Ballots
------------------
./gen-ballot.pl 15 <names-sample.txt
./gen-ballot.pl 15 <names-sample.txt
Web Ballot CGI Script
---------------------
Put `names-sample.txt` and `tokens.txt` to the same directory as
`web-ballot.pl` and make that directory available for CGI script execution.
If this directory is accessible over web, don't forget to remove read
permissions for all but the owner.
It should just work; you may need to adjust the `votes.txt` path currently
hardcoded in `web-ballot.pl`, where the cast votes are recorded.

129
web-ballot.pl Executable file
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#!/usr/bin/perl
use warnings;
use strict;
use v5.10;
use CGI;
our @names;
open my $fh, "names-sample.txt" or die "$!";
while (<$fh>) {
chomp;
push @names, $_;
}
close $fh;
our @tokens;
open $fh, "tokens.txt" or die "$!";
while (<$fh>) {
chomp;
push @tokens, $_;
}
close $fh;
my $q = CGI->new;
print $q->header(-charset => 'utf-8');
print <<EOT;
<html><head>
<title>brmelect Web Ballot</title>
<style type="text/css">
p, li { font-family: monospace; }
#ballot { margin-left: auto; margin-right: auto; border: 1pt solid; width: 15em; padding: 1ex 1em; }
.error { text-width: bold; color: red }
</style>
</head>
<body><h1 align="center">brmelect Web Ballot</h1>
EOT
if ($q->param('go')) {
my $token = $q->param('token');
unless (grep { $_ eq $token } @tokens) {
print qq#<p class="error">ERROR: Unknown token specified. Please go back and try again.</p>#;
exit;
}
my $votestr;
unless ($q->param('invalid')) {
my @indices;
for (0..@names) {
$indices[$_] = '';
}
# XXX: We ignore $indices[0] for simplicity, we start indexing from 1 here!
my %prefs;
my $n_set = 0;
for my $name (@names) {
my $pref = $q->param($name);
next unless ($pref);
unless ($pref =~ /^\d+$/) {
print qq#<p class="error">Preference for $name is $pref, which is not a number. Please go back and try again.</p>#;
exit;
}
if ($indices[$pref] ne '') {
print qq#<p class="error">Preference for $name is $pref, but this number is already also used for the candidate '$indices[$pref]'. Please go back and try again.</p>#;
exit;
}
$indices[$pref] = $name;
$prefs{$name} = $pref;
$n_set++;
}
for my $i (1..$n_set) {
if ($indices[$i] eq '') {
print qq#<p class="error">Number $i was left unused, which is not permitted. Please go back and try again.</p>#;
exit;
}
}
for my $i (($n_set+1)..$#indices) {
if ($indices[$i] ne '') {
print qq#<p class="error">Number $i was used out of uninterrupted natural number sequence, which is not permitted. Please go back and try again.</p>#;
exit;
}
}
if ($indices[1] eq 0) {
print qq#<p class="error">You must assign a preference (1) to at least one candidate. Please go back and try again.</p>#;
exit;
}
$votestr = join(',', $token, map { $prefs{$_} or 0 } @names);
} else {
$votestr = join(',', $token, map { 'x' } @names);
}
print STDERR "$votestr\n";
open $fh, '>>/home/pasky/votes.txt' or die "$!";
print $fh "$votestr\n";
close $fh;
(my $rvotestr = $votestr) =~ s/^.*?,//;
print qq#<p>Success. Your vote ($rvotestr) has been saved. You may still revise your vote before the closing call if you wish, but do NOT cast a paper ballot at this point anymore!</p>\n#;
exit;
}
print <<EOT;
<form method="post">
<div id="ballot">
<p align="center"><b>Token:</b> <input type="text" name="token" size="5" maxlength="5" /></p>
<ul>
EOT
for my $name (@names) {
print qq#<li><input type="text" name="$name" size="3" /> $name</li>\n#;
}
print <<EOT;
</ul>
<p align="center"><input type="checkbox" name="invalid" value="1" /> Produce <em>invalid</em> ballot</p>
</div>
<p align="center"><input type="submit" name="go" value="Submit Vote" /></p>
</form>
</body></html>
EOT