Add ability to include QR Code when printing vote keys

license.txt

@@ -6,36 +6,39 @@ you don't have your priorities right"-file.)
 1. Wuhu comes with no obligations from the side of its creators.
    We won't add features unless they're a really good idea, even
    if your party's success depends on it. (Because it doesn't.)
-   
+
 2. The creators of Wuhu take no responsibility over any damage
    you cause with it. (Yes, you.)
    In other words, if your party sucks, you might want to look
    somewhere else for blame.
-   
+
 3. Wuhu is free, as in beer. We don't ask for free entrance to
    parties that use Wuhu, nor any compensation, nothing.
    It would be nice, however, if you could notify us about the
    use of our stuff.
-   
+
 4. Please don't make mutated versions of it, and/or if you have
    something you hacked in and it doesn't smell too bad of
    WTF, contact us and we'll try to integrate it with credits included.
-   
+
 5. Wuhu remains our copyright. Just so you know.
 
 
 
 OptimusPrinceps example font courtesy of Manfred Klein.
   http://www.dafont.com/optimusprinceps.font
-  
+
 OpenSSL Toolkit libraries courtesy of The OpenSSL Project.
   http://www.openssl.org/
-  
+
 Prototype JS library courtesy of Prototype Core Team
   http://prototypejs.org/
-  
+
 Adminer courtesy of Jakub Vrana
   http://www.adminer.org/
-  
+
 Reveal.js courtesy of Hakim El Hattab
   http://lab.hakim.se/reveal-js/
+
+QRCode for PHP5 courtesy of Kazuhiko Arase
+  http://www.d-project.com/

www_admin/plugins/qrcodevotekeys/options.php

@@ -0,0 +1,36 @@
+<?php
+
+defined('ADMIN_DIR') || exit();
+
+if (isset($_POST['qrcodevotekeys_register_url'])) {
+	update_setting('qrcodevotekeys_register_url', $_POST['qrcodevotekeys_register_url']);
+}
+
+if (isset($_POST['qrcodevotekeys_pixelsize'])) {
+	update_setting('qrcodevotekeys_pixelsize', $_POST['qrcodevotekeys_pixelsize']);
+}
+
+$qrcodevotekeys_register_url = $settings['qrcodevotekeys_register_url'] ?? 'http://party.lan/index.php?page=Login&votekey={%VOTEKEY%}';
+$qrcodevotekeys_pixelsize = ((int)($settings['qrcodevotekeys_pixelsize'] ?? 2)) ?? 2;
+?>
+<style>
+	#qrcodevotekeys_form input[type="text"] { width: 500px; }
+</style>
+
+<h2>Votekeys with QR code</h2>
+
+<h3>Print Votekeys with QR code</h3>
+<a href="<?php echo _html($_SERVER['REQUEST_URI']); ?>&print=1" target="_blank">Print Votekeys with QR code</a>
+
+<form action="<?php echo _html($_SERVER['REQUEST_URI']); ?>" method="post" enctype="multipart/form-data" id="qrcodevotekeys_form">
+	<label>Register URL (Used for QRCode, <b>{%VOTEKEY%}</b> will be substituted):</label>
+	<input name="qrcodevotekeys_register_url" type="text" value="<?php echo _html($qrcodevotekeys_register_url); ?>">
+
+	<label>Size of QR Code pixel:</label>
+	<select name="qrcodevotekeys_pixelsize">
+		<?php for ($i = 1; $i <= 32; $i++): ?>
+			<option value="<?php echo $i; ?>"<?php echo ($qrcodevotekeys_pixelsize === $i ? ' selected' : ''); ?>><?php echo $i; ?> px</option>
+		<?php endfor; ?>
+	</select>
+	<input type="submit" value="Save"/>
+</form>

www_admin/plugins/qrcodevotekeys/plugin.php

@@ -0,0 +1,119 @@
+<?php
+/*
+Plugin name: Print Votekeys with QR code
+Description: Add ability to print votekeys with QR code
+*/
+
+defined('ADMIN_DIR') || exit();
+
+function qrcodevotekeys_generate_html($url) {
+	require_once(__DIR__.'/qrcode.php');
+
+	$qr = QRCode::getMinimumQRCode($url, QR_ERROR_CORRECT_LEVEL_L);
+
+	$html = '<table>';
+	for ($r = 0; $r < $qr->getModuleCount(); $r++) {
+		$html .= '<tr>';
+		for ($c = 0; $c < $qr->getModuleCount(); $c++) {
+			$isdark = $qr->isDark($r, $c);
+			if ($isdark) {
+				$html .= '<td class="dark"></td>';
+			} else {
+				$html .= '<td></td>';
+			}
+		}
+		$html .= '</tr>';
+	}
+	$html .= '</table>';
+
+	return $html;
+}
+
+function qrcodevotekeys_print() {
+	global $settings;
+
+	$register_url = $settings['qrcodevotekeys_register_url'] ?? 'http://party.lan/index.php?page=Login&votekey={%VOTEKEY%}';
+	$pixelsize = ((int)($settings['qrcodevotekeys_pixelsize'] ?? 2)) ?? 2;
+
+	$format = $settings['votekeys_format'] ?: '{%VOTEKEY%}';
+	$stylesheet = $settings['votekeys_css'] ?? '';
+	$rows = SQLLib::selectRows('SELECT * FROM `votekeys`');
+?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html>
+<head>
+	<title></title>
+	<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-2" />
+	<style type="text/css">
+		body {
+			font-family: arial;
+			margin: 0;
+			padding: 0;
+		}
+		ul {
+			margin: 0;
+			padding: 0;
+		}
+		li {
+			list-style: none;
+			padding: 15px;
+			padding-top: 25px;
+			padding-bottom: 25px;
+			border: 1px dotted #ccc;
+			text-align:center;
+			font-size: 130%;
+			letter-spacing: 2px;
+		}
+		.votekeys li {
+			float: left;
+			width: 25%;
+		}
+		.qr {
+			display: block;
+			padding-bottom: 10px;
+		}
+		.qr table {
+			display: inline-block;
+		}
+		.qr table, .qr tr, .qr td {
+			border-style: none;
+			border-collapse: collapse;
+			margin: 0;
+			padding: 0;
+		}
+		.qr td {
+			width: <?php echo $pixelsize; ?>px;
+			height: <?php echo $pixelsize; ?>px;
+		}
+		.qr td.dark {
+			background-color: #000;
+		}
+
+		<?php echo $stylesheet; ?>
+	</style>
+</head>
+<body>
+	<ul class="votekeys">
+		<?php foreach($rows as $row): ?>
+			<li>
+				<span class="qr"><?php echo qrcodevotekeys_generate_html(str_replace('{%VOTEKEY%}', $row->votekey, $register_url)); ?></span>
+				<?php echo str_replace('{%VOTEKEY%}', $row->votekey, $format); ?>
+			</li>
+		<?php endforeach; ?>
+	</ul>
+</body>
+</html>
+<?php
+}
+
+add_hook('admin_menu', function($data) {
+	$data['links']['pluginoptions.php?plugin=qrcodevotekeys'] = 'QR code Votekeys';
+
+});
+
+add_hook('admin_page_start', function() {
+	if (!empty($_GET['plugin']) && $_GET['plugin'] === 'qrcodevotekeys' && isset($_GET['print'])) {
+		qrcodevotekeys_print();
+		exit();
+	}
+});