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<?php |
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namespace kalanis\kw_forms\Controls\Security\Captcha; |
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use ArrayAccess; |
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use kalanis\kw_forms\Exceptions\RenderException; |
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/** |
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* Class AGraphical |
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* @package kalanis\kw_forms\Controls\Security\Captcha |
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* Graphical captcha |
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*/ |
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abstract class AGraphical extends ACaptcha |
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{ |
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protected string $templateLabel = '<img src="data:image/png;base64,%2$s" id="%1$s" alt="You need to solve this." />'; |
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protected string $templateInput = '<input type="text" value=""%2$s />'; |
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protected string $font = ''; |
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protected string $renderError = 'Cannot render captcha image!'; |
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protected ?ArrayAccess $session = null; |
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protected function fillSession(string $alias, ArrayAccess &$session, string $text): void |
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{ |
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$stringNow = $alias . '_now'; |
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$stringLast = $alias . '_last'; |
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$session->offsetSet($stringLast, ($session->offsetExists($stringNow) ? $session->offsetGet($stringNow) : null)); |
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$session->offsetSet($stringNow, $text); |
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$this->session = & $session; |
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} |
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/** |
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* Render label on form control |
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* @param string|array<string, string> $attributes |
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* @throws RenderException |
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* @return string |
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*/ |
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public function renderLabel($attributes = array()): string |
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{ |
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if ($this->canPass()) { |
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return ''; |
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} |
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return $this->wrapIt(sprintf($this->templateLabel, $this->getAttribute('id'), $this->getImage(strval($this->getLabel())), $this->renderAttributes($attributes)), $this->wrappersLabel); |
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} |
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/** |
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* @param string $text |
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* @throws RenderException |
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* @return string |
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*/ |
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protected function getImage(string $text): string |
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{ |
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$im = imagecreatetruecolor(160, 25); |
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if (false === $im) { |
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// @codeCoverageIgnoreStart |
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// problems with gd library |
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throw new RenderException($this->renderError); |
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} |
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// @codeCoverageIgnoreEnd |
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$white = intval(imagecolorallocate($im, 255, 255, 255)); |
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$grey = intval(imagecolorallocate($im, 169, 169, 169)); |
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$black = intval(imagecolorallocate($im, 0, 0, 0)); |
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imagefilledrectangle($im, 0, 0, 160, 25, $white); |
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imagettftext($im, 20, 0, 9, 19, $black, $this->font, $text); |
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imagettftext($im, 20, 0, 11, 21, $black, $this->font, $text); |
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imagettftext($im, 20, 0, 10, 20, $black, $this->font, $text); |
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for ($i = 0; 3 > $i; $i++) { |
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imageline($im, 0, $i * 10, 400, $i * 10, $grey); |
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} |
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for ($i = 0; 16 > $i; $i++) { |
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imageline($im, $i * 10, 0, $i * 10, 30, $grey); |
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} |
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ob_start(); |
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imagepng($im); |
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$img = strval(ob_get_contents()); |
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ob_end_clean(); |
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imagedestroy($im); |
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return $img; |
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} |
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/** |
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* Generate and returns random string with combination of numbers and chars with specified length |
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* @param int $stringLength |
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* @return string |
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*/ |
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protected function generateRandomString(int $stringLength = 16): string |
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{ |
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$all = ['1','2','3','4','5','6','7','8','9','0','a','b','c','d','e','f','g','h','i', |
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'j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','!','$','%']; |
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$string = ''; |
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for ($i = 0; $i < $stringLength; $i++) { |
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$rand = mt_rand(0, count($all) - 1); |
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$string .= $all[$rand]; |
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} |
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//print_r(['CPT_>'=>$string]); |
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return $string; |
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} |
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1 |
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protected function getSession(): ArrayAccess |
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{ |
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if (!empty($this->session)) { |
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return $this->session; |
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} |
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// @codeCoverageIgnoreStart |
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// you need to whant session before call that sets the control |
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throw new \LogicException('Set the session first!'); |
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// @codeCoverageIgnoreEnd |
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} |
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} |
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alex-kalanis /
kw_forms
