| New file |
|---|
| 0,0 → 1,224 |
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| <?php |
| /* |
| * This work is hereby released into the Public Domain. |
| * To view a copy of the public domain dedication, |
| * visit http://creativecommons.org/licenses/publicdomain/ or send a letter to |
| * Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA. |
| * |
| */ |
| |
| require_once dirname(__FILE__)."/Image.class.php"; |
| |
| /** |
| * AntiSpam |
| * String printed on the images are case insensitive. |
| * |
| * @package Artichow |
| */ |
| class awAntiSpam extends awImage { |
| |
| /** |
| * Anti-spam string |
| * |
| * @var string |
| */ |
| protected $string; |
| |
| /** |
| * Noise intensity |
| * |
| * @var int |
| */ |
| protected $noise = 0; |
| |
| /** |
| * Construct a new awAntiSpam image |
| * |
| * @param string $string A string to display |
| */ |
| public function __construct($string = '') { |
| |
| parent::__construct(); |
| |
| $this->string = (string)$string; |
| |
| } |
| |
| /** |
| * Create a random string |
| * |
| * @param int $length String length |
| * @return string String created |
| */ |
| public function setRand($length) { |
| |
| $length = (int)$length; |
| |
| $this->string = ''; |
| |
| $letters = 'aAbBCDeEFgGhHJKLmMnNpPqQRsStTuVwWXYZz2345679'; |
| $number = strlen($letters); |
| |
| for($i = 0; $i < $length; $i++) { |
| $this->string .= $letters{mt_rand(0, $number - 1)}; |
| } |
| |
| return $this->string; |
| |
| } |
| |
| /** |
| * Set noise on image |
| * |
| * @param int $nois Noise intensity (from 0 to 10) |
| */ |
| public function setNoise($noise) { |
| if($noise < 0) { |
| $noise = 0; |
| } |
| if($noise > 10) { |
| $noise = 10; |
| } |
| $this->noise = (int)$noise; |
| } |
| |
| /** |
| * Save string value in session |
| * You can use check() to verify the value later |
| * |
| * @param string $qName A name that identify the anti-spam image |
| */ |
| public function save($qName) { |
| $this->session(); |
| $session = 'artichow_'.(string)$qName; |
| $_SESSION[$session] = $this->string; |
| } |
| |
| /** |
| * Verify user entry |
| * |
| * @param string $qName A name that identify the anti-spam image |
| * @param string $value User-defined value |
| * @param bool $case TRUE for case insensitive check, FALSE for case sensitive check ? (default to TRUE) |
| * @return bool TRUE if the value is correct, FALSE otherwise |
| */ |
| public function check($qName, $value, $case = TRUE) { |
| |
| $this->session(); |
| |
| $session = 'artichow_'.(string)$qName; |
| |
| return ( |
| array_key_exists($session, $_SESSION) === TRUE and |
| $case ? |
| (strtolower($_SESSION[$session]) === strtolower((string)$value)) : |
| ($_SESSION[$session] === (string)$value) |
| ); |
| |
| } |
| |
| /** |
| * Draw image |
| */ |
| public function draw() { |
| |
| $fonts = array( |
| 'Tuffy', |
| 'TuffyBold', |
| 'TuffyItalic', |
| 'TuffyBoldItalic' |
| ); |
| |
| $sizes = array(12, 12.5, 13, 13.5, 14, 15, 16, 17, 18, 19); |
| |
| $widths = array(); |
| $heights = array(); |
| $texts = array(); |
| |
| // Set up a temporary driver to allow font size calculations... |
| $this->setSize(10, 10); |
| $driver = $this->getDriver(); |
| |
| for($i = 0; $i < strlen($this->string); $i++) { |
| |
| $fontKey = array_rand($fonts); |
| $sizeKey = array_rand($sizes); |
| |
| $font = new awTTFFont( |
| $fonts[$fontKey], $sizes[$sizeKey] |
| ); |
| |
| $text = new awText( |
| $this->string{$i}, |
| $font, |
| NULL, |
| mt_rand(-15, 15) |
| ); |
| |
| $widths[] = $driver->getTextWidth($text); |
| $heights[] = $driver->getTextHeight($text); |
| $texts[] = $text; |
| |
| } |
| |
| // ... and get rid of it. |
| $this->driver = NULL; |
| |
| $width = array_sum($widths); |
| $height = array_max($heights); |
| |
| $totalWidth = $width + 10 + count($texts) * 10; |
| $totalHeight = $height + 20; |
| |
| $this->setSize($totalWidth, $totalHeight); |
| |
| $this->create(); |
| |
| for($i = 0; $i < strlen($this->string); $i++) { |
| |
| $this->driver->string( |
| $texts[$i], |
| new awPoint( |
| 5 + array_sum(array_slice($widths, 0, $i)) + $widths[$i] / 2 + $i * 10, |
| 10 + ($height - $heights[$i]) / 2 |
| ) |
| ); |
| |
| } |
| |
| $this->drawNoise($totalWidth, $totalHeight); |
| |
| $this->send(); |
| |
| } |
| |
| protected function drawNoise($width, $height) { |
| |
| $points = $this->noise * 30; |
| $color = new awColor(0, 0, 0); |
| |
| for($i = 0; $i < $points; $i++) { |
| $this->driver->point( |
| $color, |
| new awPoint( |
| mt_rand(0, $width), |
| mt_rand(0, $height) |
| ) |
| ); |
| } |
| |
| } |
| |
| protected function session() { |
| |
| // Start session if needed |
| if(!session_id()) { |
| session_start(); |
| } |
| |
| } |
| |
| } |
| |
| registerClass('AntiSpam'); |
| ?> |