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| 1 | <?php |
| 2 | /** |
| 3 | * Pop PHP Framework (http://www.popphp.org/) |
| 4 | * |
| 5 | * @link https://github.com/popphp/popphp-framework |
| 6 | * @author Nick Sagona, III <dev@nolainteractive.com> |
| 7 | * @copyright Copyright (c) 2009-2024 NOLA Interactive, LLC. (http://www.nolainteractive.com) |
| 8 | * @license http://www.popphp.org/license New BSD License |
| 9 | */ |
| 10 | |
| 11 | /** |
| 12 | * @namespace |
| 13 | */ |
| 14 | namespace Pop\Form\Element\Input; |
| 15 | |
| 16 | /** |
| 17 | * Form CAPTCHA element class |
| 18 | * |
| 19 | * @category Pop |
| 20 | * @package Pop\Form |
| 21 | * @author Nick Sagona, III <dev@nolainteractive.com> |
| 22 | * @copyright Copyright (c) 2009-2024 NOLA Interactive, LLC. (http://www.nolainteractive.com) |
| 23 | * @license http://www.popphp.org/license New BSD License |
| 24 | * @version 4.0.0 |
| 25 | */ |
| 26 | |
| 27 | class Captcha extends Text |
| 28 | { |
| 29 | |
| 30 | /** |
| 31 | * Current token data |
| 32 | * @var array |
| 33 | */ |
| 34 | protected array $token = []; |
| 35 | |
| 36 | /** |
| 37 | * Constructor |
| 38 | * |
| 39 | * Instantiate the captcha input form element |
| 40 | * |
| 41 | * @param string $name |
| 42 | * @param ?string $value |
| 43 | * @param ?string $captcha |
| 44 | * @param ?string $answer |
| 45 | * @param int $expire |
| 46 | * @param ?string $indent |
| 47 | */ |
| 48 | public function __construct( |
| 49 | string $name, ?string $value = null, ?string $captcha = null, ?string $answer = null, int $expire = 300, ?string $indent = null |
| 50 | ) |
| 51 | { |
| 52 | // Start a session. |
| 53 | if (session_id() == '') { |
| 54 | session_start(); |
| 55 | } |
| 56 | |
| 57 | // If token does not exist, create one |
| 58 | if (!isset($_SESSION['pop_captcha']) || (isset($_GET['captcha']) && ((int)$_GET['captcha'] == 1))) { |
| 59 | $this->createNewToken($captcha, $answer, $expire); |
| 60 | // Else, retrieve existing token |
| 61 | } else { |
| 62 | $this->token = unserialize($_SESSION['pop_captcha']); |
| 63 | |
| 64 | // Check to see if the token has expired |
| 65 | if ($this->token['expire'] > 0) { |
| 66 | if (($this->token['expire'] + $this->token['start']) < time()) { |
| 67 | $this->createNewToken($captcha, $value, $expire); |
| 68 | } |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | parent::__construct($name, strtoupper((string)$value), $indent); |
| 73 | $this->setRequired(true); |
| 74 | $this->setValidator(); |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Set the token of the CAPTCHA form element |
| 79 | * |
| 80 | * @param ?string $captcha |
| 81 | * @param ?string $answer |
| 82 | * @param int $expire |
| 83 | * @return Captcha |
| 84 | */ |
| 85 | public function createNewToken(?string $captcha = null, ?string $answer = null, int $expire = 300): Captcha |
| 86 | { |
| 87 | if (($captcha === null) || ($answer === null)) { |
| 88 | $captcha = $this->generateEquation(); |
| 89 | $answer = $this->evaluateEquation($captcha); |
| 90 | } |
| 91 | |
| 92 | $this->token = [ |
| 93 | 'captcha' => $captcha, |
| 94 | 'answer' => $answer, |
| 95 | 'expire' => (int)$expire, |
| 96 | 'start' => time() |
| 97 | ]; |
| 98 | $_SESSION['pop_captcha'] = serialize($this->token); |
| 99 | return $this; |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * Get token |
| 104 | * |
| 105 | * @return array |
| 106 | */ |
| 107 | public function getToken(): array |
| 108 | { |
| 109 | return $this->token; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Set the label of the captcha form element |
| 114 | * |
| 115 | * @param string $label |
| 116 | * @return Captcha |
| 117 | */ |
| 118 | public function setLabel(string $label): Captcha |
| 119 | { |
| 120 | parent::setLabel($label); |
| 121 | |
| 122 | if (isset($this->token['captcha'])) { |
| 123 | if ((!str_contains($this->token['captcha'], '<img')) && |
| 124 | ((str_contains($this->token['captcha'], ' + ')) || |
| 125 | (str_contains($this->token['captcha'], ' - ')) || |
| 126 | (str_contains($this->token['captcha'], ' * ')) || |
| 127 | (str_contains($this->token['captcha'], ' / ')))) { |
| 128 | $this->label = $this->label . '(' . |
| 129 | str_replace([' * ', ' / '], [' × ', ' ÷ '], $this->token['captcha'] .')'); |
| 130 | } else { |
| 131 | $this->label = $this->label . $this->token['captcha']; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | return $this; |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * Set the validator |
| 140 | * |
| 141 | * @throws Exception |
| 142 | * @return void |
| 143 | */ |
| 144 | protected function setValidator(): void |
| 145 | { |
| 146 | $this->validators = []; |
| 147 | |
| 148 | // Get query data |
| 149 | if (!isset($_SERVER['REQUEST_METHOD'])) { |
| 150 | throw new Exception('Error: The server request method is not set.'); |
| 151 | } |
| 152 | |
| 153 | $queryData = []; |
| 154 | switch ($_SERVER['REQUEST_METHOD']) { |
| 155 | case 'GET': |
| 156 | $queryData = $_GET; |
| 157 | break; |
| 158 | |
| 159 | case 'POST': |
| 160 | $queryData = $_POST; |
| 161 | break; |
| 162 | |
| 163 | default: |
| 164 | $input = fopen('php://input', 'r'); |
| 165 | $qData = null; |
| 166 | while ($data = fread($input, 1024)) { |
| 167 | $qData .= $data; |
| 168 | } |
| 169 | |
| 170 | parse_str($qData, $queryData); |
| 171 | } |
| 172 | |
| 173 | // If there is query data, set validator to check against the token value |
| 174 | if (count($queryData) > 0) { |
| 175 | if (isset($queryData[$this->name])) { |
| 176 | $this->addValidator(function($value){ |
| 177 | $token = $this->getToken(); |
| 178 | if (isset($token['answer']) && (strtoupper($token['answer']) == strtoupper($value))) { |
| 179 | return null; |
| 180 | } else { |
| 181 | return 'The answer is incorrect.'; |
| 182 | } |
| 183 | }); |
| 184 | } |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * Randomly generate a simple, basic equation |
| 190 | * |
| 191 | * @return string |
| 192 | */ |
| 193 | protected function generateEquation(): string |
| 194 | { |
| 195 | $ops = [' + ', ' - ', ' * ', ' / ']; |
| 196 | $equation = null; |
| 197 | |
| 198 | $rand1 = rand(1, 10); |
| 199 | $rand2 = rand(1, 10); |
| 200 | $op = $ops[rand(0, 3)]; |
| 201 | |
| 202 | // If the operator is division, keep the equation very simple, with no remainder |
| 203 | if ($op == ' / ') { |
| 204 | $mod = ($rand2 > $rand1) ? $rand2 % $rand1 : $rand1 % $rand2; |
| 205 | while ($mod != 0) { |
| 206 | $rand1 = rand(1, 10); |
| 207 | $rand2 = rand(1, 10); |
| 208 | $mod = ($rand2 > $rand1) ? $rand2 % $rand1 : $rand1 % $rand2; |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | $equation = ($rand2 > $rand1) ? $rand2 . $op . $rand1 : $rand1 . $op . $rand2; |
| 213 | |
| 214 | return $equation; |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * Evaluate equation |
| 219 | * |
| 220 | * @param string $equation |
| 221 | * @return int |
| 222 | */ |
| 223 | protected function evaluateEquation(string $equation): int |
| 224 | { |
| 225 | return eval("return ($equation);"); |
| 226 | } |
| 227 | |
| 228 | } |