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3.07 |
1 | <?php |
2 | |
3 | /** |
4 | * QR Code Generator |
5 | * |
6 | * PHP version 8 |
7 | * |
8 | * Copyright (C) Villanova University 2007. |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License version 2, |
12 | * as published by the Free Software Foundation. |
13 | * |
14 | * This program is distributed in the hope that it will be useful, |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
17 | * GNU General Public License for more details. |
18 | * |
19 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
22 | * |
23 | * @category VuFind |
24 | * @package QRCode_Generator |
25 | * @author Andrew S. Nagy <vufind-tech@lists.sourceforge.net> |
26 | * @author Demian Katz <demian.katz@villanova.edu> |
27 | * @author Luke O'Sullivan <l.osullivan@swansea.ac.uk> |
28 | * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License |
29 | * @link https://vufind.org/wiki/configuration:external_content Wiki |
30 | */ |
31 | |
32 | namespace VuFind\QRCode; |
33 | |
34 | use Endroid\QrCode\ErrorCorrectionLevel; |
35 | use Endroid\QrCode\QrCode; |
36 | use Endroid\QrCode\Writer\PngWriter; |
37 | |
38 | use function intval; |
39 | use function strlen; |
40 | |
41 | /** |
42 | * QR Code Generator |
43 | * |
44 | * @category VuFind |
45 | * @package QRCode_Generator |
46 | * @author Andrew S. Nagy <vufind-tech@lists.sourceforge.net> |
47 | * @author Demian Katz <demian.katz@villanova.edu> |
48 | * @author Luke O'Sullivan <l.osullivan@swansea.ac.uk> |
49 | * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License |
50 | * @link https://vufind.org/wiki/configuration:external_content Wiki |
51 | */ |
52 | class Loader extends \VuFind\ImageLoader |
53 | { |
54 | /** |
55 | * The default params used to generate the QRCode |
56 | * |
57 | * @var string |
58 | */ |
59 | protected $defaultParams = ['level' => 'L', 'size' => '3', 'margin' => '4']; |
60 | |
61 | /** |
62 | * Constructor |
63 | * |
64 | * @param \Laminas\Config\Config $config VuFind configuration |
65 | * @param \VuFindTheme\ThemeInfo $theme VuFind theme tools |
66 | */ |
67 | public function __construct($config, \VuFindTheme\ThemeInfo $theme) |
68 | { |
69 | $this->setThemeInfo($theme); |
70 | $this->configuredFailImage |
71 | = $config->QRCode->noQRCodeAvailableImage ?? null; |
72 | $this->defaultFailImage = 'images/noQRCode.gif'; |
73 | } |
74 | |
75 | /** |
76 | * Get default parameters. |
77 | * |
78 | * @return array |
79 | */ |
80 | public function getDefaults() |
81 | { |
82 | return $this->defaultParams; |
83 | } |
84 | |
85 | /** |
86 | * Set up a QR code image |
87 | * |
88 | * @param string $text The QR code text |
89 | * @param array $rawParams QR code parameters (level/size/margin) |
90 | * |
91 | * @return void |
92 | */ |
93 | public function loadQRCode($text, $rawParams = []) |
94 | { |
95 | // Fill in defaults: |
96 | $params = $rawParams + $this->defaultParams; |
97 | |
98 | // Normalize parameters; when the size setting is less than 30 pixels, |
99 | // do some math to try to map old PHPQRCode-style settings to new |
100 | // Endroid\QrCode equivalents. When the size setting is 30 or higher, |
101 | // treat 'size' and 'margin' as literal pixel sizes. |
102 | $size = intval($params['size']); |
103 | $margin = intval($params['margin']); |
104 | $level = $this->mapErrorLevel($params['level']); |
105 | if ($size < 30) { |
106 | // In the old system, the margin was multiplied by the size.... |
107 | $margin *= $size; |
108 | |
109 | // Do some magic math to adjust the QR code size to accommodate the |
110 | // length of the text and the quality level. This is probably not the |
111 | // smartest way to do this, but it seems good enough for VuFind's |
112 | // limited needs. |
113 | $sizeIncrement = ceil(ceil(sqrt(strlen($text))) / 10); |
114 | if ($level == ErrorCorrectionLevel::High) { |
115 | $sizeIncrement *= 38; |
116 | } elseif ($level == ErrorCorrectionLevel::Quartile) { |
117 | $sizeIncrement *= 34; |
118 | } else { |
119 | $sizeIncrement *= 30; |
120 | } |
121 | |
122 | // Put it all together: |
123 | $size = $size * $sizeIncrement - $params['margin']; |
124 | } |
125 | |
126 | // Fetch image: |
127 | if (!$this->fetchQRCode($text, $size, $margin, $level)) { |
128 | $this->loadUnavailable(); |
129 | } |
130 | } |
131 | |
132 | /** |
133 | * Map an incoming error correction level parameter to a valid constant. |
134 | * |
135 | * @param string $level Error correction level parameter |
136 | * |
137 | * @return ErrorCorrectionLevel |
138 | */ |
139 | protected function mapErrorLevel($level): ErrorCorrectionLevel |
140 | { |
141 | switch (strtoupper(substr($level, 0, 1))) { |
142 | case '3': |
143 | case 'H': |
144 | return ErrorCorrectionLevel::High; |
145 | case '2': |
146 | case 'Q': |
147 | return ErrorCorrectionLevel::Quartile; |
148 | case '1': |
149 | case 'M': |
150 | return ErrorCorrectionLevel::Medium; |
151 | case '0': |
152 | case 'L': |
153 | default: |
154 | return ErrorCorrectionLevel::Low; |
155 | } |
156 | } |
157 | |
158 | /** |
159 | * Generate a QR code image |
160 | * |
161 | * @param string $text The QR code text |
162 | * @param int $size QR code width/height (in pixels) |
163 | * @param int $margin QR code margin (in pixels) |
164 | * @param ErrorCorrectionLevelInterface $level Error correction level object |
165 | * |
166 | * @return bool True if image displayed, false on failure. |
167 | */ |
168 | protected function fetchQRCode($text, $size, $margin, $level) |
169 | { |
170 | if (strlen(trim($text)) == 0) { |
171 | return false; |
172 | } |
173 | |
174 | // Build the code: |
175 | try { |
176 | $code = new QrCode($text); |
177 | $code->setMargin($margin); |
178 | $code->setErrorCorrectionLevel($level); |
179 | $code->setSize($size); |
180 | $code->setEncoding(new \Endroid\QrCode\Encoding\Encoding('UTF-8')); |
181 | $code->setRoundBlockSizeMode(\Endroid\QrCode\RoundBlockSizeMode::None); |
182 | |
183 | // Save the values. |
184 | $writer = new PngWriter(); |
185 | $result = $writer->write($code); |
186 | $this->contentType = $result->getMimeType(); |
187 | $this->image = $result->getString(); |
188 | } catch (\Exception $e) { |
189 | return false; |
190 | } |
191 | return true; |
192 | } |
193 | } |