/usr/share/php/Text/CAPTCHA/Driver/Figlet.php is in php-text-captcha 1.0.2-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
* Require Figlet class for rendering the text.
*
* PHP version 5
*
* @category Text
* @package Text_CAPTCHA
* @author Aaron Wormus <wormus@php.net>
* @author Christian Wenz <wenz@php.net>
* @author Michael Cramer <michael@bigmichi1.de>
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @link http://pear.php.net/package/Text_CAPTCHA
*/
require_once 'Text/CAPTCHA/Driver/Base.php';
require_once 'Text/Figlet.php';
/**
* Text_CAPTCHA_Driver_Figlet - Text_CAPTCHA driver Figlet based CAPTCHAs
*
* @category Text
* @package Text_CAPTCHA
* @author Aaron Wormus <wormus@php.net>
* @author Christian Wenz <wenz@php.net>
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @link http://pear.php.net/package/Text_CAPTCHA
* @todo define an obfuscation algorithm
*/
class Text_CAPTCHA_Driver_Figlet extends Text_CAPTCHA_Driver_Base
{
/**
* Text_Password options.
*
* @var array
*/
private $_textPasswordOptions;
/**
* Width of CAPTCHA
*
* @var int
*/
private $_width;
/**
* Length of CAPTCHA
*
* @var int
*/
private $_length;
/**
* Figlet font
*
* @var string
*/
private $_font;
/**
* Figlet font
*
* @var array
*/
private $_style = array();
/**
* Output Format
*
* @var string
*/
private $_output;
/**
* init function
*
* Initializes the new Text_CAPTCHA_Driver_Figlet object and creates a GD image
*
* @param array $options CAPTCHA options
*
* @return void
* @throws Text_CAPTCHA_Exception when no options are given
*/
public function initDriver($options = array())
{
if (!empty($options['output'])) {
$this->_output = (string)$options['output'];
} else {
$this->_output = 'html';
}
if (isset($options['width']) && $options['width']) {
$this->_width = (int)$options['width'];
} else {
$this->_width = 200;
}
if (!empty($options['length'])) {
$this->_length = $options['length'];
} else {
$this->_length = 6;
}
if (!isset($options['phrase']) || empty($options['phrase'])) {
$phraseOptions = (isset($options['phraseOptions'])
&& is_array($options['phraseOptions']))
? $options['phraseOptions'] : array();
$this->_textPasswordOptions = $phraseOptions;
} else {
$this->setPhrase($options['phrase']);
}
if (!empty($options['style'])
&& is_array($options['style'])
) {
$this->_style = $options['style'];
}
if (empty($this->_style['padding'])) {
$this->_style['padding'] = '5px';
}
if (!empty($options['font_file'])) {
if (is_array($options['font_file'])) {
$arr = $options['font_file'];
$this->_font = $arr[array_rand($arr)];
} else {
$this->_font = $options['font_file'];
}
}
}
/**
* Create the passphrase.
*
* @return string
*/
public function createPhrase()
{
$options = $this->_textPasswordOptions;
$textPassword = new Text_Password();
if (!is_array($options) || count($options) === 0) {
$this->setPhrase($textPassword->create($this->_length));
} else {
if (count($options) === 1) {
$this->setPhrase($textPassword->create($this->_length, $options[0]));
} else {
$this->setPhrase(
$textPassword->create($this->_length, $options[0], $options[1])
);
}
}
}
/**
* Create CAPTCHA image.
*
* This method creates a CAPTCHA image.
*
* @return void on error
* @throws Text_CAPTCHA_Exception when loading font fails
*/
public function createCAPTCHA()
{
$pear = new PEAR();
$figlet = new Text_Figlet();
if ($pear->isError($figlet->loadFont($this->_font))) {
throw new Text_CAPTCHA_Exception('Error loading Text_Figlet font');
}
$outputString = $figlet->lineEcho($this->getPhrase());
switch ($this->_output) {
case 'text':
$this->setCaptcha($outputString);
break;
case 'html':
$this->setCaptcha($this->_getCAPTCHAAsHTML($outputString));
break;
case 'javascript':
$this->setCaptcha($this->_getCAPTCHAAsJavascript($outputString));
break;
default:
throw new Text_CAPTCHA_Exception('Invalid output option given');
}
}
/**
* Return CAPTCHA as HTML.
*
* This method returns the CAPTCHA as HTML.
*
* @param string $figletOutput output string from Figlet.
*
* @return string HTML Figlet image or PEAR error
*/
private function _getCAPTCHAAsHTML($figletOutput)
{
$charWidth = strpos($figletOutput, "\n");
$data = str_replace("\n", '<br />', $figletOutput);
$textSize = ($this->_width / $charWidth) * 1.4;
$cssOutput = "";
foreach ($this->_style as $key => $value) {
$cssOutput .= "$key: $value;";
}
$htmlOutput = '<div style="font-family: courier;
font-size: ' . $textSize . 'px;
width:' . $this->_width . 'px;
text-align:center;">';
$htmlOutput .= '<div style="' . $cssOutput . 'margin:0px;">
<pre style="padding: 0px; margin: 0px;">' . $data . '</pre></div></div>';
return $htmlOutput;
}
/**
* Return CAPTCHA as Javascript version of HTML.
*
* This method returns the CAPTCHA as a Javascript string.
* I'm not exactly sure what the point of doing this would be.
*
* @param string $figletOutput output string from Figlet.
*
* @return string javascript string or PEAR error
*/
private function _getCAPTCHAAsJavascript($figletOutput)
{
$obfusData = rawurlencode($figletOutput);
$javascript = "<script language=\"javascript\">
document.write(unescape(\"$obfusData\" ) );
</script>";
return $javascript;
}
}
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