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securimage.php
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<?php
// error_reporting(E_ALL); ini_set('display_errors', 1); // uncomment this line for debugging
/**
* Project: Securimage: A PHP class for creating and managing form CAPTCHA images<br />
* File: securimage.php<br />
*
* Copyright (c) 2012, Drew Phillips
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Any modifications to the library should be indicated clearly in the source code
* to inform users that the changes are not a part of the original software.<br /><br />
*
* If you found this script useful, please take a quick moment to rate it.<br />
* http://www.hotscripts.com/rate/49400.html Thanks.
*
* @link http://www.phpcaptcha.org Securimage PHP CAPTCHA
* @link http://www.phpcaptcha.org/latest.zip Download Latest Version
* @link http://www.phpcaptcha.org/Securimage_Docs/ Online Documentation
* @copyright 2012 Drew Phillips
* @author Drew Phillips <[email protected]>
* @version 3.2RC3 (May 2012)
* @package Securimage
*
*/
/**
ChangeLog
3.2RC3
- Fix canSendHeaders() check which was breaking if a PHP startup error was issued
3.2RC2
- Add error handler (https://github.com/dapphp/securimage/issues/15)
- Fix flash examples to use the correct value name for audio parameter
3.2RC1
- New audio captcha code. Faster, fully dynamic audio, full WAV support
(Paul Voegler, Drew Phillips) <http://voegler.eu/pub/audio>
- New Flash audio streaming button. User defined image and size supported
- Additional options for customizing captcha (noise_level, send_headers,
no_exit, no_session, display_value
- Add captcha ID support. Uses sqlite and unique captcha IDs to track captchas,
no session used
- Add static methods for creating and validating captcha by ID
- Automatic clearing of old codes from SQLite database
3.0.3Beta
- Add improved mixing function to WavFile class (Paul Voegler)
- Improve performance and security of captcha audio (Paul Voegler, Drew Phillips)
- Add option to use random file as background noise in captcha audio
- Add new securimage options for audio files
3.0.2Beta
- Fix issue with session variables when upgrading from 2.0 - 3.0
- Improve audio captcha, switch to use WavFile class, make mathematical captcha audio work
3.0.1
- Bugfix: removed use of deprecated variable in addSignature method that would cause errors with display_errors on
3.0
- Rewrite class using PHP5 OOP
- Remove support for GD fonts, require FreeType
- Remove support for multi-color codes
- Add option to make codes case-sensitive
- Add namespaces to support multiple captchas on a single page or page specific captchas
- Add option to show simple math problems instead of codes
- Remove support for mp3 files due to vulnerability in decoding mp3 audio files
- Create new flash file to stream wav files instead of mp3
- Changed to BSD license
2.0.2
- Fix pathing to make integration into libraries easier (Nathan Phillip Brink [email protected])
2.0.1
- Add support for browsers with cookies disabled (requires php5, sqlite) maps users to md5 hashed ip addresses and md5 hashed codes for security
- Add fallback to gd fonts if ttf support is not enabled or font file not found (Mike Challis http://www.642weather.com/weather/scripts.php)
- Check for previous definition of image type constants (Mike Challis)
- Fix mime type settings for audio output
- Fixed color allocation issues with multiple colors and background images, consolidate allocation to one function
- Ability to let codes expire after a given length of time
- Allow HTML color codes to be passed to Securimage_Color (suggested by Mike Challis)
2.0.0
- Add mathematical distortion to characters (using code from HKCaptcha)
- Improved session support
- Added Securimage_Color class for easier color definitions
- Add distortion to audio output to prevent binary comparison attack (proposed by Sven "SavageTiger" Hagemann [insecurity.nl])
- Flash button to stream mp3 audio (Douglas Walsh www.douglaswalsh.net)
- Audio output is mp3 format by default
- Change font to AlteHaasGrotesk by yann le coroller
- Some code cleanup
1.0.4 (unreleased)
- Ability to output audible codes in mp3 format to stream from flash
1.0.3.1
- Error reading from wordlist in some cases caused words to be cut off 1 letter short
1.0.3
- Removed shadow_text from code which could cause an undefined property error due to removal from previous version
1.0.2
- Audible CAPTCHA Code wav files
- Create codes from a word list instead of random strings
1.0
- Added the ability to use a selected character set, rather than a-z0-9 only.
- Added the multi-color text option to use different colors for each letter.
- Switched to automatic session handling instead of using files for code storage
- Added GD Font support if ttf support is not available. Can use internal GD fonts or load new ones.
- Added the ability to set line thickness
- Added option for drawing arced lines over letters
- Added ability to choose image type for output
*/
/**
* Securimage CAPTCHA Class.
*
* @version 3.0
* @package Securimage
* @subpackage classes
* @author Drew Phillips <[email protected]>
*
*/
class Securimage
{
// All of the public variables below are securimage options
// They can be passed as an array to the Securimage constructor, set below,
// or set from securimage_show.php and securimage_play.php
/**
* Renders captcha as a JPEG image
* @var int
*/
const SI_IMAGE_JPEG = 1;
/**
* Renders captcha as a PNG image (default)
* @var int
*/
const SI_IMAGE_PNG = 2;
/**
* Renders captcha as a GIF image
* @var int
*/
const SI_IMAGE_GIF = 3;
/**
* Create a normal alphanumeric captcha
* @var int
*/
const SI_CAPTCHA_STRING = 0;
/**
* Create a captcha consisting of a simple math problem
* @var int
*/
const SI_CAPTCHA_MATHEMATIC = 1;
/**
* The width of the captcha image
* @var int
*/
public $image_width = 215;
/**
* The height of the captcha image
* @var int
*/
public $image_height = 80;
/**
* The type of the image, default = png
* @var int
*/
public $image_type = self::SI_IMAGE_PNG;
/**
* The background color of the captcha
* @var Securimage_Color
*/
public $image_bg_color = '#ffffff';
/**
* The color of the captcha text
* @var Securimage_Color
*/
public $text_color = '#707070';
/**
* The color of the lines over the captcha
* @var Securimage_Color
*/
public $line_color = '#707070';
/**
* The color of the noise that is drawn
* @var Securimage_Color
*/
public $noise_color = '#707070';
/**
* How transparent to make the text 0 = completely opaque, 100 = invisible
* @var int
*/
public $text_transparency_percentage = 50;
/**
* Whether or not to draw the text transparently, true = use transparency, false = no transparency
* @var bool
*/
public $use_transparent_text = false;
/**
* The length of the captcha code
* @var int
*/
public $code_length = 6;
/**
* Whether the captcha should be case sensitive (not recommended, use only for maximum protection)
* @var bool
*/
public $case_sensitive = false;
/**
* The character set to use for generating the captcha code
* @var string
*/
public $charset = 'ABCDEFGHKLMNPRSTUVWYZabcdefghklmnprstuvwyz23456789';
/**
* How long in seconds a captcha remains valid, after this time it will not be accepted
* @var unknown_type
*/
public $expiry_time = 900;
/**
* The session name securimage should use, only set this if your application uses a custom session name
* It is recommended to set this value below so it is used by all securimage scripts
* @var string
*/
public $session_name = null;
/**
* true to use the wordlist file, false to generate random captcha codes
* @var bool
*/
public $use_wordlist = false;
/**
* The level of distortion, 0.75 = normal, 1.0 = very high distortion
* @var double
*/
public $perturbation = 0.75;
/**
* How many lines to draw over the captcha code to increase security
* @var int
*/
public $num_lines = 8;
/**
* The level of noise (random dots) to place on the image, 0-10
* @var int
*/
public $noise_level = 0;
/**
* The signature text to draw on the bottom corner of the image
* @var string
*/
public $image_signature = '';
/**
* The color of the signature text
* @var Securimage_Color
*/
public $signature_color = '#707070';
/**
* The path to the ttf font file to use for the signature text, defaults to $ttf_file (AHGBold.ttf)
* @var string
*/
public $signature_font;
/**
* Use an SQLite database to store data (for users that do not support cookies)
* @var bool
*/
public $use_sqlite_db = false;
/**
* The type of captcha to create, either alphanumeric, or a math problem<br />
* Securimage::SI_CAPTCHA_STRING or Securimage::SI_CAPTCHA_MATHEMATIC
* @var int
*/
public $captcha_type = self::SI_CAPTCHA_STRING; // or self::SI_CAPTCHA_MATHEMATIC;
/**
* The captcha namespace, use this if you have multiple forms on a single page, blank if you do not use multiple forms on one page
* @var string
* <code>
* <?php
* // in securimage_show.php (create one show script for each form)
* $img->namespace = 'contact_form';
*
* // in form validator
* $img->namespace = 'contact_form';
* if ($img->check($code) == true) {
* echo "Valid!";
* }
* </code>
*/
public $namespace;
/**
* The font file to use to draw the captcha code, leave blank for default font AHGBold.ttf
* @var string
*/
public $ttf_file;
/**
* The path to the wordlist file to use, leave blank for default words/words.txt
* @var string
*/
public $wordlist_file;
/**
* The directory to scan for background images, if set a random background will be chosen from this folder
* @var string
*/
public $background_directory;
/**
* The path to the SQLite database file to use, if $use_sqlite_database = true, should be chmod 666
* @var string
*/
public $sqlite_database;
/**
* The path to the securimage audio directory, can be set in securimage_play.php
* @var string
* <code>
* $img->audio_path = '/home/yoursite/public_html/securimage/audio/';
* </code>
*/
public $audio_path;
/**
* The path to the directory containing audio files that will be selected
* randomly and mixed with the captcha audio.
*
* @var string
*/
public $audio_noise_path;
/**
* Whether or not to mix background noise files into captcha audio (true = mix, false = no)
* Mixing random background audio with noise can help improve security of audio captcha.
* Default: securimage/audio/noise
*
* @since 3.0.3
* @see Securimage::$audio_noise_path
* @var bool
*/
public $audio_use_noise;
/**
* The method and threshold (or gain factor) used to normalize the mixing with background noise.
* See http://www.voegler.eu/pub/audio/ for more information.
*
* Valid: <ul>
* <li> >= 1 - Normalize by multiplying by the threshold (boost - positive gain). <br />
* A value of 1 in effect means no normalization (and results in clipping). </li>
* <li> <= -1 - Normalize by dividing by the the absolute value of threshold (attenuate - negative gain). <br />
* A factor of 2 (-2) is about 6dB reduction in volume.</li>
* <li> [0, 1) - (open inverval - not including 1) - The threshold
* above which amplitudes are comressed logarithmically. <br />
* e.g. 0.6 to leave amplitudes up to 60% "as is" and compress above. </li>
* <li> (-1, 0) - (open inverval - not including -1 and 0) - The threshold
* above which amplitudes are comressed linearly. <br />
* e.g. -0.6 to leave amplitudes up to 60% "as is" and compress above. </li></ul>
*
* Default: 0.6
*
* @since 3.0.4
* @var float
*/
public $audio_mix_normalization = 0.6;
/**
* Whether or not to degrade audio by introducing random noise (improves security of audio captcha)
* Default: true
*
* @since 3.0.3
* @var bool
*/
public $degrade_audio;
/**
* Minimum delay to insert between captcha audio letters in milliseconds
*
* @since 3.0.3
* @var float
*/
public $audio_gap_min = 0;
/**
* Maximum delay to insert between captcha audio letters in milliseconds
*
* @since 3.0.3
* @var float
*/
public $audio_gap_max = 600;
/**
* Captcha ID if using static captcha
* @var string Unique captcha id
*/
protected static $_captchaId = null;
protected $im;
protected $tmpimg;
protected $bgimg;
protected $iscale = 5;
protected $securimage_path = null;
/**
* The captcha challenge value (either the case-sensitive/insensitive word captcha, or the solution to the math captcha)
*
* @var string Captcha challenge value
*/
protected $code;
/**
* The display value of the captcha to draw on the image (the word captcha, or the math equation to present to the user)
*
* @var string Captcha display value to draw on the image
*/
protected $code_display;
/**
* A value that can be passed to the constructor that can be used to generate a captcha image with a given value
* This value does not get stored in the session or database and is only used when calling Securimage::show().
* If a display_value was passed to the constructor and the captcha image is generated, the display_value will be used
* as the string to draw on the captcha image. Used only if captcha codes are generated and managed by a 3rd party app/library
*
* @var string Captcha code value to display on the image
*/
protected $display_value;
/**
* Captcha code supplied by user [set from Securimage::check()]
*
* @var string
*/
protected $captcha_code;
/**
* Flag that can be specified telling securimage not to call exit after generating a captcha image or audio file
*
* @var bool If true, script will not terminate; if false script will terminate (default)
*/
protected $no_exit;
/**
* Flag indicating whether or not a PHP session should be started and used
*
* @var bool If true, no session will be started; if false, session will be started and used to store data (default)
*/
protected $no_session;
/**
* Flag indicating whether or not HTTP headers will be sent when outputting captcha image/audio
*
* @var bool If true (default) headers will be sent, if false, no headers are sent
*/
protected $send_headers;
// sqlite database handle (if using sqlite)
protected $sqlite_handle;
// gd color resources that are allocated for drawing the image
protected $gdbgcolor;
protected $gdtextcolor;
protected $gdlinecolor;
protected $gdsignaturecolor;
/**
* Create a new securimage object, pass options to set in the constructor.<br />
* This can be used to display a captcha, play an audible captcha, or validate an entry
* @param array $options
* <code>
* $options = array(
* 'text_color' => new Securimage_Color('#013020'),
* 'code_length' => 5,
* 'num_lines' => 5,
* 'noise_level' => 3,
* 'font_file' => Securimage::getPath() . '/custom.ttf'
* );
*
* $img = new Securimage($options);
* </code>
*/
public function __construct($options = array())
{
$this->securimage_path = dirname(__FILE__);
if (is_array($options) && sizeof($options) > 0) {
foreach($options as $prop => $val) {
if ($prop == 'captchaId') {
Securimage::$_captchaId = $val;
$this->use_sqlite_db = true;
} else {
$this->$prop = $val;
}
}
}
$this->image_bg_color = $this->initColor($this->image_bg_color, '#ffffff');
$this->text_color = $this->initColor($this->text_color, '#616161');
$this->line_color = $this->initColor($this->line_color, '#616161');
$this->noise_color = $this->initColor($this->noise_color, '#616161');
$this->signature_color = $this->initColor($this->signature_color, '#616161');
if (is_null($this->ttf_file)) {
$this->ttf_file = $this->securimage_path . '/AHGBold.ttf';
}
$this->signature_font = $this->ttf_file;
if (is_null($this->wordlist_file)) {
$this->wordlist_file = $this->securimage_path . '/words/words.txt';
}
if (is_null($this->sqlite_database)) {
$this->sqlite_database = $this->securimage_path . '/database/securimage.sqlite';
}
if (is_null($this->audio_path)) {
$this->audio_path = $this->securimage_path . '/audio/';
}
if (is_null($this->audio_noise_path)) {
$this->audio_noise_path = $this->audio_path . '/noise/';
}
if (is_null($this->audio_use_noise)) {
$this->audio_use_noise = true;
}
if (is_null($this->degrade_audio)) {
$this->degrade_audio = true;
}
if (is_null($this->code_length) || (int)$this->code_length < 1) {
$this->code_length = 6;
}
if (is_null($this->perturbation) || !is_numeric($this->perturbation)) {
$this->perturbation = 0.75;
}
if (is_null($this->namespace) || !is_string($this->namespace)) {
$this->namespace = 'default';
}
if (is_null($this->no_exit)) {
$this->no_exit = false;
}
if (is_null($this->no_session)) {
$this->no_session = false;
}
if (is_null($this->send_headers)) {
$this->send_headers = true;
}
if ($this->no_session != true) {
// Initialize session or attach to existing
if ( session_id() == '' ) { // no session has been started yet, which is needed for validation
if (!is_null($this->session_name) && trim($this->session_name) != '') {
session_name(trim($this->session_name)); // set session name if provided
}
session_start();
}
}
}
/**
* Return the absolute path to the Securimage directory
* @return string The path to the securimage base directory
*/
public static function getPath()
{
return dirname(__FILE__);
}
/**
* Generate a new captcha ID or retrieve the current ID
*
* @param $new bool If true, generates a new challenge and returns and ID
* @param $options array Additional options to be passed to Securimage
*
* @return null|string Returns null if no captcha id set and new was false, or string captcha ID
*/
public static function getCaptchaId($new = true, array $options = array())
{
if ((bool)$new == true) {
$id = sha1(uniqid($_SERVER['REMOTE_ADDR'], true));
$opts = array('no_session' => true,
'use_sqlite_db' => true);
if (sizeof($options) > 0) $opts = array_merge($opts, $options);
$si = new self($opts);
Securimage::$_captchaId = $id;
$si->createCode();
return $id;
} else {
return Securimage::$_captchaId;
}
}
/**
* Validate a captcha code input against a captcha ID
* @param string $id The captcha ID to check
* @param string $value The captcha value supplied by the user
*
* @return bool true if the code was valid for the given captcha ID, false if not or if database failed to open
*/
public static function checkByCaptchaId($id, $value)
{
$si = new self(array('captchaId' => $id,
'no_session' => true,
'use_sqlite_db' => true));
if ($si->openDatabase()) {
$code = $si->getCodeFromDatabase();
if (is_array($code)) {
$si->code = $code['code'];
$si->code_display = $code['code_disp'];
}
if ($si->check($value)) {
return true;
} else {
return false;
}
} else {
return false;
}
}
/**
* Used to serve a captcha image to the browser
* @param string $background_image The path to the background image to use
* <code>
* $img = new Securimage();
* $img->code_length = 6;
* $img->num_lines = 5;
* $img->noise_level = 5;
*
* $img->show(); // sends the image to browser
* exit;
* </code>
*/
public function show($background_image = '')
{
set_error_handler(array(&$this, 'errorHandler'));
if($background_image != '' && is_readable($background_image)) {
$this->bgimg = $background_image;
}
$this->doImage();
}
/**
* Check a submitted code against the stored value
* @param string $code The captcha code to check
* <code>
* $code = $_POST['code'];
* $img = new Securimage();
* if ($img->check($code) == true) {
* $captcha_valid = true;
* } else {
* $captcha_valid = false;
* }
* </code>
*/
public function check($code)
{
$this->code_entered = $code;
$this->validate();
return $this->correct_code;
}
/**
* Output a wav file of the captcha code to the browser
*
* <code>
* $img = new Securimage();
* $img->outputAudioFile(); // outputs a wav file to the browser
* exit;
* </code>
*/
public function outputAudioFile()
{
set_error_handler(array(&$this, 'errorHandler'));
require_once dirname(__FILE__) . '/WavFile.php';
try {
$audio = $this->getAudibleCode();
} catch (Exception $ex) {
if (($fp = @fopen(dirname(__FILE__) . '/si.error_log', 'a+')) !== false) {
fwrite($fp, date('Y-m-d H:i:s') . ': Securimage audio error "' . $ex->getMessage() . '"' . "\n");
fclose($fp);
}
$audio = $this->audioError();
}
if ($this->canSendHeaders() || $this->send_headers == false) {
if ($this->send_headers) {
$uniq = md5(uniqid(microtime()));
header("Content-Disposition: attachment; filename=\"securimage_audio-{$uniq}.wav\"");
header('Cache-Control: no-store, no-cache, must-revalidate');
header('Expires: Sun, 1 Jan 2000 12:00:00 GMT');
header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . 'GMT');
header('Content-type: audio/x-wav');
if (extension_loaded('zlib')) {
ini_set('zlib.output_compression', true); // compress output if supported by browser
} else {
header('Content-Length: ' . strlen($audio));
}
}
echo $audio;
} else {
echo '<hr /><strong>'
.'Failed to generate audio file, content has already been '
.'output.<br />This is most likely due to misconfiguration or '
.'a PHP error was sent to the browser.</strong>';
}
restore_error_handler();
if (!$this->no_exit) exit;
}
/**
* Return the code from the session or sqlite database if used. If none exists yet, an empty string is returned
*
* @param $array bool True to receive an array containing the code and properties
* @return array|string Array if $array = true, otherwise a string containing the code
*/
public function getCode($array = false)
{
$code = '';
$time = 0;
$disp = 'error';
if ($this->no_session != true) {
if (isset($_SESSION['securimage_code_value'][$this->namespace]) &&
trim($_SESSION['securimage_code_value'][$this->namespace]) != '') {
if ($this->isCodeExpired(
$_SESSION['securimage_code_ctime'][$this->namespace]) == false) {
$code = $_SESSION['securimage_code_value'][$this->namespace];
$time = $_SESSION['securimage_code_ctime'][$this->namespace];
$disp = $_SESSION['securimage_code_disp'] [$this->namespace];
}
}
}
if ($this->use_sqlite_db == true && function_exists('sqlite_open')) {
// no code in session - may mean user has cookies turned off
$this->openDatabase();
$code = $this->getCodeFromDatabase();
} else { /* no code stored in session or sqlite database, validation will fail */ }
if ($array == true) {
return array('code' => $code, 'ctime' => $time, 'display' => $disp);
} else {
return $code;
}
}
/**
* The main image drawing routing, responsible for constructing the entire image and serving it
*/
protected function doImage()
{
if( ($this->use_transparent_text == true || $this->bgimg != '') && function_exists('imagecreatetruecolor')) {
$imagecreate = 'imagecreatetruecolor';
} else {
$imagecreate = 'imagecreate';
}
$this->im = $imagecreate($this->image_width, $this->image_height);
$this->tmpimg = $imagecreate($this->image_width * $this->iscale, $this->image_height * $this->iscale);
$this->allocateColors();
imagepalettecopy($this->tmpimg, $this->im);
$this->setBackground();
$code = '';
if ($this->getCaptchaId(false) !== null) {
// a captcha Id was supplied
// check to see if a display_value for the captcha image was set
if (is_string($this->display_value) && strlen($this->display_value) > 0) {
$this->code_display = $this->display_value;
$this->code = ($this->case_sensitive) ?
$this->display_value :
strtolower($this->display_value);
$code = $this->code;
} else if ($this->openDatabase()) {
// no display_value, check the database for existing captchaId
$code = $this->getCodeFromDatabase();
// got back a result from the database with a valid code for captchaId
if (is_array($code)) {
$this->code = $code['code'];
$this->code_display = $code['code_disp'];
$code = $code['code'];
}
}
}
if ($code == '') {
// if the code was not set using display_value or was not found in
// the database, create a new code
$this->createCode();
}
if ($this->noise_level > 0) {
$this->drawNoise();
}
$this->drawWord();
if ($this->perturbation > 0 && is_readable($this->ttf_file)) {
$this->distortedCopy();
}
if ($this->num_lines > 0) {
$this->drawLines();
}
if (trim($this->image_signature) != '') {
$this->addSignature();
}
$this->output();
}
/**
* Allocate the colors to be used for the image
*/
protected function allocateColors()
{
// allocate bg color first for imagecreate
$this->gdbgcolor = imagecolorallocate($this->im,
$this->image_bg_color->r,
$this->image_bg_color->g,
$this->image_bg_color->b);
$alpha = intval($this->text_transparency_percentage / 100 * 127);
if ($this->use_transparent_text == true) {
$this->gdtextcolor = imagecolorallocatealpha($this->im,
$this->text_color->r,
$this->text_color->g,
$this->text_color->b,
$alpha);
$this->gdlinecolor = imagecolorallocatealpha($this->im,
$this->line_color->r,
$this->line_color->g,
$this->line_color->b,
$alpha);
$this->gdnoisecolor = imagecolorallocatealpha($this->im,
$this->noise_color->r,
$this->noise_color->g,
$this->noise_color->b,
$alpha);
} else {
$this->gdtextcolor = imagecolorallocate($this->im,
$this->text_color->r,
$this->text_color->g,
$this->text_color->b);
$this->gdlinecolor = imagecolorallocate($this->im,
$this->line_color->r,
$this->line_color->g,
$this->line_color->b);
$this->gdnoisecolor = imagecolorallocate($this->im,
$this->noise_color->r,
$this->noise_color->g,
$this->noise_color->b);
}
$this->gdsignaturecolor = imagecolorallocate($this->im,
$this->signature_color->r,
$this->signature_color->g,
$this->signature_color->b);
}
/**
* The the background color, or background image to be used
*/
protected function setBackground()
{
// set background color of image by drawing a rectangle since imagecreatetruecolor doesn't set a bg color
imagefilledrectangle($this->im, 0, 0,
$this->image_width, $this->image_height,
$this->gdbgcolor);
imagefilledrectangle($this->tmpimg, 0, 0,
$this->image_width * $this->iscale, $this->image_height * $this->iscale,
$this->gdbgcolor);
if ($this->bgimg == '') {
if ($this->background_directory != null &&
is_dir($this->background_directory) &&
is_readable($this->background_directory))
{
$img = $this->getBackgroundFromDirectory();
if ($img != false) {
$this->bgimg = $img;
}
}
}
if ($this->bgimg == '') {
return;
}
$dat = @getimagesize($this->bgimg);
if($dat == false) {
return;
}
switch($dat[2]) {
case 1: $newim = @imagecreatefromgif($this->bgimg); break;
case 2: $newim = @imagecreatefromjpeg($this->bgimg); break;
case 3: $newim = @imagecreatefrompng($this->bgimg); break;
default: return;
}
if(!$newim) return;
imagecopyresized($this->im, $newim, 0, 0, 0, 0,
$this->image_width, $this->image_height,
imagesx($newim), imagesy($newim));
}
/**
* Scan the directory for a background image to use
*/
protected function getBackgroundFromDirectory()
{
$images = array();
if ( ($dh = opendir($this->background_directory)) !== false) {
while (($file = readdir($dh)) !== false) {
if (preg_match('/(jpg|gif|png)$/i', $file)) $images[] = $file;
}
closedir($dh);
if (sizeof($images) > 0) {
return rtrim($this->background_directory, '/') . '/' . $images[rand(0, sizeof($images)-1)];
}
}
return false;
}
/**
* Generates the code or math problem and saves the value to the session
*/
protected function createCode()
{
$this->code = false;
switch($this->captcha_type) {
case self::SI_CAPTCHA_MATHEMATIC:
{
do {
$signs = array('+', '-', 'x');
$left = rand(1, 10);
$right = rand(1, 5);