<?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) 2013, 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 2013 Drew Phillips
* @author Drew Phillips <drew@drew-phillips.com>
* @version 3.5.1 (June 21, 2013)
* @package Securimage
*
*/
/**
ChangeLog
3.5.1
- Fix XSS vulnerability in example_form.php (discovered by Gjoko Krstic - <gjoko@zeroscience.mk>)
3.5
- Release new version
- MB string support for charlist
- Modify audio file path to use language directories
- Changed default captcha appearance
3.2RC4
- Add MySQL, PostgreSQL, and SQLite3 support for database storage
- Deprecate "use_sqlite_db" option and remove SQLite2/sqlite_* functions
- Add new captcha type that displays 2 dictionary words on one image
- Update examples
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 ohnobinki@ohnopublishing.net)
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 3.5
* @package Securimage
* @subpackage classes
* @author Drew Phillips <drew@drew-phillips.com>
*
*/
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;
/**
* Create a word based captcha using 2 words
* @var int
*/
const SI_CAPTCHA_WORDS = 2;
/**
* MySQL option identifier for database storage option
*
* @var string
*/
const SI_DRIVER_MYSQL = 'mysql';
/**
* PostgreSQL option identifier for database storage option
*
* @var string
*/
const SI_DRIVER_PGSQL = 'pgsql';
/**
* SQLite option identifier for database storage option
*
* @var string
*/
const SI_DRIVER_SQLITE3 = 'sqlite';
/*%*********************************************************************%*/
// Properties
/**
* 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 = 20;
/**
* Whether or not to draw the text transparently, true = use transparency, false = no transparency
* @var bool
*/
public $use_transparent_text = true;
/**
* 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 = 0.85;
/**
* How many lines to draw over the captcha code to increase security
* @var int
*/
public $num_lines = 5;
/**
* The level of noise (random dots) to place on the image, 0-10
* @var int
*/
public $noise_level = 2;
/**
* 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 $signature_font;
/**
* DO NOT USE!!!
* Use an SQLite database to store data (for users that do not support cookies)
* @var bool
* @see Securimage::$use_sqlite_db
* @deprecated 3.2RC4
*/
public $use_sqlite_db = false;
/**
* Use a database backend for code storage.
* Provides a fallback to users with cookies disabled.
* Required when using captcha IDs.
*
* @see Securimage::$database_driver
* @var bool
*/
public $use_database = false;
/**
* Database driver to use for database support.
* Allowable values: 'mysql', 'pgsql', 'sqlite'.
* Default: sqlite
*
* @var string
*/
public $database_driver = self::SI_DRIVER_SQLITE3;
/**
* Database host to connect to when using mysql or postgres
* On Linux use "localhost" for Unix domain socket, otherwise uses TCP/IP
* Does not apply to SQLite
*
* @var string
*/
public $database_host = 'localhost';
/**
* Database username for connection (mysql, postgres only)
* Default is an empty string
*
* @var string
*/
public $database_user = '';
/**
* Database password for connection (mysql, postgres only)
* Default is empty string
*
* @var string
*/
public $database_pass = '';
/**
* Name of the database to select (mysql, postgres only)
*
* @see Securimage::$database_file for SQLite
* @var string
*/
public $database_name = '';
/**
* Database table where captcha codes are stored
* Note: Securimage will attempt to create this table for you if it does
* not exist. If the table cannot be created, an E_USER_WARNING is emitted.
*
* @var string
*/
public $database_table = 'captcha_codes';
/**
* Fully qualified path to the database file when using SQLite3.
* This value is only used when $database_driver == sqlite3 and does
* not apply when no database is used, or when using MySQL or PostgreSQL.
*
* @var string
*/
public $database_file;
/**
* 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
* @deprecated 3.2RC4
* @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/en/';
* </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;
public $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
*/
public $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;
/**
* PDO connection when a database is used
*
* @var resource
*/
protected $pdo_conn;
// 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;
$this->use_database = true;
} else if ($prop == 'use_sqlite_db') {
trigger_error("The use_sqlite_db option is deprecated, use 'use_database' instead", E_USER_NOTICE);
} 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->database_file)) {
$this->database_file = $this->securimage_path . '/database/securimage.sq3';
}
if (is_null($this->audio_path)) {
$this->audio_path = $this->securimage_path . '/audio/en/';
}
if (is_null($this->audio_noise_path)) {
$this->audio_noise_path = $this->securimage_path . '/audio/noise/';
}
if (is_null($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 $options array Additional options to be passed to Securimage.
* Must include database options if not set directly in securimage.php
*
* @return null|string Returns null if no captcha id set and new was false, or string captcha ID
*/
public static function getCaptchaId($new = true, array $options = array())
{
if (is_null($new) || (bool)$new == true) {
$id = sha1(uniqid($_SERVER['REMOTE_ADDR'], true));
$opts = array('no_session' => true,
'use_database' => true);
if (sizeof($options) > 0) $opts = array_merge($options, $opts);
$si = new self($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
* @param array $options Array of options to construct Securimage with.
* Options must include database options if they are not set in securimage.php
*
* @see Securimage::$database_driver
* @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, array $options = array())
{
$opts = array('captchaId' => $id,
'no_session' => true,
'use_database' => true);
if (sizeof($options) > 0) $opts = array_merge($options, $opts);
$si = new self($opts);
if ($si->openDatabase()) {
$code = $si->getCodeFromDatabase();
if (is_array($code)) {
$si->code = $code['code'];
$si->code_display = $code['code_disp'];
}
if ($si->check($value)) {
$si->clearCodeFromDatabase();
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, $returnExisting = false)
{
$code = '';
$time = 0;
$disp = 'error';
if ($returnExisting && strlen($this->code) > 0) {
if ($array) {
return array('code' => $this->code,
'display' => $this->code_display,
'code_display' => $this->code_display,
'time' => 0);
} else {
return $this->code;
}
}
if ($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 (empty($code) && $this->use_database) {
// 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, '/') . '/' . $images[mt_rand(0, sizeof($images)-1)];
}
}
return false;
}
/**
* Generates the code or math problem and saves the value to the session
*/
public function createCode()
{
$this->code = false;
switch($this->captcha_type) {
case self::SI_CAPTCHA_MATHEMATIC:
{
do {
$signs = array('+', '-', 'x');
$left = mt_rand(1, 10);
$right = mt_rand(1, 5);
$sign = $signs[mt_rand(0, 2)];
switch($sign) {
case 'x': $c = $left * $right; break;
case '-': $c = $left - $right; break;
default: $c = $left + $right; break;
}
} while ($c <= 0); // no negative #'s or 0
$this->code = $c;
$this->code_display = "$left $sign $right";
break;
}
case self::SI_CAPTCHA_WORDS:
$words = $this->readCodeFromFile(2);
$this->code = implode(' ', $words);
$this->code_display = $this->code;
break;
default:
{
if ($this->use_wordlist && is_readable($this->wordlist_file)) {
$this->code = $this->readCodeFromFile();
}
if ($this->code == false) {
$this->code = $this->generateCode($this->code_length);
}
$this->code_display = $this->code;
$this->code = ($this->case_sensitive) ? $this->code : strtolower($this->code);
} // default
}
$this->saveData();
}
/**
* Draws the captcha code on the image
*/
protected function drawWord()
{
$width2 = $this->image_width * $this->iscale;
$height2 = $this->image_height * $this->iscale;
if (!is_readable($this->ttf_file)) {
imagestring($this->im, 4, 10, ($this->image_height / 2) - 5, 'Failed to load TTF font file!', $this->gdtextcolor);
} else {
if ($this->perturbation > 0) {
$font_size = $height2 * .4;
$bb = imageftbbox($font_size, 0, $this->ttf_file, $this->code_display);
$tx = $bb[4] - $bb[0];
$ty = $bb[5] - $bb[1];
$x = floor($width2 / 2 - $tx / 2 - $bb[0]);
$y = round($height2 / 2 - $ty / 2 - $bb[1]);
imagettftext($this->tmpimg, $font_size, 0, $x, $y, $this->gdtextcolor, $this->ttf_file, $this->code_display);
} else {
$font_size = $this->image_height * .4;
$bb = imageftbbox($font_size, 0, $this->ttf_file, $this->code_display);
$tx = $bb[4] - $bb[0];
$ty = $bb[5] - $bb[1];
$x = floor($this->image_width / 2 - $tx / 2 - $bb[0]);
$y = round($this->image_height / 2 - $ty / 2 - $bb[1]);
imagettftext($this->im, $font_size, 0, $x, $y, $this->gdtextcolor, $this->ttf_file, $this->code_display);
}
}
// DEBUG
//$this->im = $this->tmpimg;
//$this->output();
}
/**
* Copies the captcha image to the final image with distortion applied
*/
protected function distortedCopy()
{
$numpoles = 3; // distortion factor
// make array of poles AKA attractor points
for ($i = 0; $i < $numpoles; ++ $i) {
$px[$i] = mt_rand($this->image_width * 0.2, $this->image_width * 0.8);
$py[$i] = mt_rand($this->image_height * 0.2, $this->image_height * 0.8);
$rad[$i] = mt_rand($this->image_height * 0.2, $this->image_height * 0.8);
$tmp = ((- $this->frand()) * 0.15) - .15;
$amp[$i] = $this->perturbation * $tmp;
}
$bgCol = imagecolorat($this->tmpimg, 0, 0);
$width2 = $this->iscale * $this->image_width;
$height2 = $this->iscale * $this->image_height;
imagepalettecopy($this->im, $this->tmpimg); // copy palette to final image so text colors come across
// loop over $img pixels, take pixels from $tmpimg with distortion field
for ($ix = 0; $ix < $this->image_width; ++ $ix) {
for ($iy = 0; $iy < $this->image_height; ++ $iy) {
$x = $ix;
$y = $iy;
for ($i = 0; $i < $numpoles; ++ $i) {
$dx = $ix - $px[$i];
$dy = $iy - $py[$i];
if ($dx == 0 && $dy == 0) {
continue;
}
$r = sqrt($dx * $dx + $dy * $dy);
if ($r > $rad[$i]) {
continue;
}
$rscale = $amp[$i] * sin(3.14 * $r / $rad[$i]);
$x += $dx * $rscale;
$y += $dy * $rscale;
}
$c = $bgCol;
$x *= $this->iscale;
$y *= $this->iscale;
if ($x >= 0 && $x < $width2 && $y >= 0 && $y < $height2) {
$c = imagecolorat($this->tmpimg, $x, $y);
}
if ($c != $bgCol) { // only copy pixels of letters to preserve any background image
imagesetpixel($this->im, $ix, $iy, $c);
}
}
}
}
/**
* Draws distorted lines on the image
*/
protected function drawLines()
{
for ($line = 0; $line < $this->num_lines; ++ $line) {
$x = $this->image_width * (1 + $line) / ($this->num_lines + 1);
$x += (0.5 - $this->frand()) * $this->image_width / $this->num_lines;
$y = mt_rand($this->image_height * 0.1, $this->image_height * 0.9);
$theta = ($this->frand() - 0.5) * M_PI * 0.7;
$w = $this->image_width;
$len = mt_rand($w * 0.4, $w * 0.7);
$lwid = mt_rand(0, 2);
$k = $this->frand() * 0.6 + 0.2;
$k = $k * $k * 0.5;
$phi = $this->frand() * 6.28;
$step = 0.5;
$dx = $step * cos($theta);
$dy = $step * sin($theta);
$n = $len / $step;
$amp = 1.5 * $this->frand() / ($k + 5.0 / $len);
$x0 = $x - 0.5 * $len * cos($theta);
$y0 = $y - 0.5 * $len * sin($theta);
$ldx = round(- $dy * $lwid);
$ldy = round($dx * $lwid);
for ($i = 0; $i < $n; ++ $i) {
$x = $x0 + $i * $dx + $amp * $dy * sin($k * $i * $step + $phi);
$y = $y0 + $i * $dy - $amp * $dx * sin($k * $i * $step + $phi);
imagefilledrectangle($this->im, $x, $y, $x + $lwid, $y + $lwid, $this->gdlinecolor);
}
}
}
/**
* Draws random noise on the image
*/
protected function drawNoise()
{
if ($this->noise_level > 10) {
$noise_level = 10;
} else {
$noise_level = $this->noise_level;
}
$t0 = microtime(true);
$noise_level *= 125; // an arbitrary number that works well on a 1-10 scale
$points = $this->image_width * $this->image_height * $this->iscale;
$height = $this->image_height * $this->iscale;
$width = $this->image_width * $this->iscale;
for ($i = 0; $i < $noise_level; ++$i) {
$x = mt_rand(10, $width);
$y = mt_rand(10, $height);
$size = mt_rand(7, 10);
if ($x - $size <= 0 && $y - $size <= 0) continue; // dont cover 0,0 since it is used by imagedistortedcopy
imagefilledarc($this->tmpimg, $x, $y, $size, $size, 0, 360, $this->gdnoisecolor, IMG_ARC_PIE);
}
$t1 = microtime(true);
$t = $t1 - $t0;
/*
// DEBUG
imagestring($this->tmpimg, 5, 25, 30, "$t", $this->gdnoisecolor);
header('content-type: image/png');
imagepng($this->tmpimg);
exit;
*/
}
/**
* Print signature text on image
*/
protected function addSignature()
{
$bbox = imagettfbbox(10, 0, $this->signature_font, $this->image_signature);
$textlen = $bbox[2] - $bbox[0];
$x = $this->image_width - $textlen - 5;
$y = $this->image_height - 3;
imagettftext($this->im, 10, 0, $x, $y, $this->gdsignaturecolor, $this->signature_font, $this->image_signature);
}
/**
* Sends the appropriate image and cache headers and outputs image to the browser
*/
protected function output()
{
if ($this->canSendHeaders() || $this->send_headers == false) {
if ($this->send_headers) {
// only send the content-type headers if no headers have been output
// this will ease debugging on misconfigured servers where warnings
// may have been output which break the image and prevent easily viewing
// source to see the error.
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");
}
switch ($this->image_type) {
case self::SI_IMAGE_JPEG:
if ($this->send_headers) header("Content-Type: image/jpeg");
imagejpeg($this->im, null, 90);
break;
case self::SI_IMAGE_GIF:
if ($this->send_headers) header("Content-Type: image/gif");
imagegif($this->im);
break;
default:
if ($this->send_headers) header("Content-Type: image/png");
imagepng($this->im);
break;
}
} else {
echo '<hr /><strong>'
.'Failed to generate captcha image, content has already been '
.'output.<br />This is most likely due to misconfiguration or '
.'a PHP error was sent to the browser.</strong>';
}
imagedestroy($this->im);
restore_error_handler();
if (!$this->no_exit) exit;
}
/**
* Gets the code and returns the binary audio file for the stored captcha code
*
* @return The audio representation of the captcha in Wav format
*/
protected function getAudibleCode()
{
$letters = array();
$code = $this->getCode(true, true);
if ($code['code'] == '') {
if (strlen($this->display_value) > 0) {
$code = array('code' => $this->display_value, 'display' => $this->display_value);
} else {
$this->createCode();
$code = $this->getCode(true);
}
}
if (preg_match('/(\d+) (\+|-|x) (\d+)/i', $code['display'], $eq)) {
$math = true;
$left = $eq[1];
$sign = str_replace(array('+', '-', 'x'), array('plus', 'minus', 'times'), $eq[2]);
$right = $eq[3];
$letters = array($left, $sign, $right);
} else {
$math = false;
$length = strlen($code['display']);
for($i = 0; $i < $length; ++$i) {
$letter = $code['display'][$i];
$letters[] = $letter;
}
}
try {
return $this->generateWAV($letters);
} catch(Exception $ex) {
throw $ex;
}
}
/**
* Gets a captcha code from a wordlist
*/
protected function readCodeFromFile($numWords = 1)
{
$fp = fopen($this->wordlist_file, 'rb');
if (!$fp) return false;
$fsize = filesize($this->wordlist_file);
if ($fsize < 128) return false; // too small of a list to be effective
if ((int)$numWords < 1 || (int)$numWords > 5) $numWords = 1;
$words = array();
$i = 0;
do {
fseek($fp, mt_rand(0, $fsize - 64), SEEK_SET); // seek to a random position of file from 0 to filesize-64
$data = fread($fp, 64); // read a chunk from our random position
$data = preg_replace("/\r?\n/", "\n", $data);
$start = @strpos($data, "\n", mt_rand(0, 56)) + 1; // random start position
$end = @strpos($data, "\n", $start); // find end of word
if ($start === false) {
// picked start position at end of file
continue;
} else if ($end === false) {
$end = strlen($data);
}
$word = strtolower(substr($data, $start, $end - $start)); // return a line of the file
$words[] = $word;
} while (++$i < $numWords);
fclose($fp);
if ($numWords < 2) {
return $words[0];
} else {
return $words;
}
}
/**
* Generates a random captcha code from the set character set
*/
protected function generateCode()
{
$code = '';
if (function_exists('mb_strlen')) {
for($i = 1, $cslen = mb_strlen($this->charset); $i <= $this->code_length; ++$i) {
$code .= mb_substr($this->charset, mt_rand(0, $cslen - 1), 1, 'UTF-8');
}
} else {
for($i = 1, $cslen = strlen($this->charset); $i <= $this->code_length; ++$i) {
$code .= substr($this->charset, mt_rand(0, $cslen - 1), 1);
}
}
return $code;
}
/**
* Checks the entered code against the value stored in the session or sqlite database, handles case sensitivity
* Also clears the stored codes if the code was entered correctly to prevent re-use
*/
protected function validate()
{
if (!is_string($this->code) || strlen($this->code) == 0) {
$code = $this->getCode();
// returns stored code, or an empty string if no stored code was found
// checks the session and database if enabled
} else {
$code = $this->code;
}
if ($this->case_sensitive == false && preg_match('/[A-Z]/', $code)) {
// case sensitive was set from securimage_show.php but not in class
// the code saved in the session has capitals so set case sensitive to true
$this->case_sensitive = true;
}
$code_entered = trim( (($this->case_sensitive) ? $this->code_entered
: strtolower($this->code_entered))
);
$this->correct_code = false;
if ($code != '') {
if (strpos($code, ' ') !== false) {
// for multi word captchas, remove more than once space from input
$code_entered = preg_replace('/\s+/', ' ', $code_entered);
$code_entered = strtolower($code_entered);
}
if ($code == $code_entered) {
$this->correct_code = true;
if ($this->no_session != true) {
$_SESSION['securimage_code_value'][$this->namespace] = '';
$_SESSION['securimage_code_ctime'][$this->namespace] = '';
}
$this->clearCodeFromDatabase();
}
}
}
/**
* Save data to session namespace and database if used
*/
protected function saveData()
{
if ($this->no_session != true) {
if (isset($_SESSION['securimage_code_value']) && is_scalar($_SESSION['securimage_code_value'])) {
// fix for migration from v2 - v3
unset($_SESSION['securimage_code_value']);
unset($_SESSION['securimage_code_ctime']);
}
$_SESSION['securimage_code_disp'] [$this->namespace] = $this->code_display;
$_SESSION['securimage_code_value'][$this->namespace] = $this->code;
$_SESSION['securimage_code_ctime'][$this->namespace] = time();
}
if ($this->use_database) {
$this->saveCodeToDatabase();
}
}
/**
* Saves the code to the sqlite database
*/
protected function saveCodeToDatabase()
{
$success = false;
$this->openDatabase();
if ($this->use_database && $this->pdo_conn) {
$id = $this->getCaptchaId(false);
$ip = $_SERVER['REMOTE_ADDR'];
if (empty($id)) {
$id = $ip;
}
$time = time();
$code = $this->code;
$code_disp = $this->code_display;
// This is somewhat expensive in PDO Sqlite3 (when there is something to delete)
$this->clearCodeFromDatabase();
$query = "INSERT INTO {$this->database_table} ("
."id, code, code_display, namespace, created) "
."VALUES(?, ?, ?, ?, ?)";
$stmt = $this->pdo_conn->prepare($query);
$success = $stmt->execute(array($id, $code, $code_disp, $this->namespace, $time));
if (!$success) {
$err = $stmt->errorInfo();
trigger_error("Failed to insert code into database. {$err[1]}: {$err[2]}", E_USER_WARNING);
}
}
return $success !== false;
}
/**
* Open sqlite database
*/
protected function openDatabase()
{
$this->pdo_conn = false;
if ($this->use_database) {
$pdo_extension = 'PDO_' . strtoupper($this->database_driver);
if (!extension_loaded($pdo_extension)) {
trigger_error("Database support is turned on in Securimage, but the chosen extension $pdo_extension is not loaded in PHP.", E_USER_WARNING);
return false;
}
}
if ($this->database_driver == self::SI_DRIVER_SQLITE3) {
if (!file_exists($this->database_file)) {
$fp = fopen($this->database_file, 'w+');
if (!$fp) {
$err = error_get_last();
trigger_error("Securimage failed to create SQLite3 database file '{$this->database_file}'. Reason: {$err['message']}", E_USER_WARNING);
return false;
}
fclose($fp);
chmod($this->database_file, 0666);
} else if (!is_writeable($this->database_file)) {
trigger_error("Securimage does not have read/write access to database file '{$this->database_file}. Make sure permissions are 0666 and writeable by user '" . get_current_user() . "'", E_USER_WARNING);
return false;
}
}
$dsn = $this->getDsn();
try {
$options = array();
$this->pdo_conn = new PDO($dsn, $this->database_user, $this->database_pass, $options);
} catch (PDOException $pdoex) {
trigger_error("Database connection failed: " . $pdoex->getMessage(), E_USER_WARNING);
return false;
}
try {
if (!$this->checkTablesExist()) {
// create tables...
$this->createDatabaseTables();
}
} catch (Exception $ex) {
trigger_error($ex->getMessage(), E_USER_WARNING);
$this->pdo_conn = null;
return false;
}
if (mt_rand(0, 100) / 100.0 == 1.0) {
$this->purgeOldCodesFromDatabase();
}
return $this->pdo_conn;
}
protected function getDsn()
{
$dsn = sprintf('%s:', $this->database_driver);
switch($this->database_driver) {
case self::SI_DRIVER_SQLITE3:
$dsn .= $this->database_file;
break;
case self::SI_DRIVER_MYSQL:
case self::SI_DRIVER_PGSQL:
$dsn .= sprintf('host=%s;dbname=%s',
$this->database_host,
$this->database_name);
break;
}
return $dsn;
}
protected function checkTablesExist()
{
$table = $this->pdo_conn->quote($this->database_table);
switch($this->database_driver) {
case self::SI_DRIVER_SQLITE3:
// query row count for sqlite, PRAGMA queries seem to return no
// rowCount using PDO even if there are rows returned
$query = "SELECT COUNT(id) FROM $table";
break;
case self::SI_DRIVER_MYSQL:
$query = "SHOW TABLES LIKE $table";
break;
case self::SI_DRIVER_PGSQL:
$query = "SELECT * FROM information_schema.columns WHERE table_name = $table;";
break;
}
$result = $this->pdo_conn->query($query);
if (!$result) {
$err = $this->pdo_conn->errorInfo();
if ($this->database_driver == self::SI_DRIVER_SQLITE3 &&
$err[1] === 1 && strpos($err[2], 'no such table') !== false)
{
return false;
}
throw new Exception("Failed to check tables: {$err[0]} - {$err[1]}: {$err[2]}");
} else if ($this->database_driver == self::SI_DRIVER_SQLITE3) {
// successful here regardless of row count for sqlite
return true;
} else if ($result->rowCount() == 0) {
return false;
} else {
return true;
}
}
protected function createDatabaseTables()
{
$queries = array();
switch($this->database_driver) {
case self::SI_DRIVER_SQLITE3:
$queries[] = "CREATE TABLE \"{$this->database_table}\" (
id VARCHAR(40),
namespace VARCHAR(32) NOT NULL,
code VARCHAR(32) NOT NULL,
code_display VARCHAR(32) NOT NULL,
created INTEGER NOT NULL,
PRIMARY KEY(id, namespace)
)";
$queries[] = "CREATE INDEX ndx_created ON {$this->database_table} (created)";
break;
case self::SI_DRIVER_MYSQL:
$queries[] = "CREATE TABLE `{$this->database_table}` (
`id` VARCHAR(40) NOT NULL,
`namespace` VARCHAR(32) NOT NULL,
`code` VARCHAR(32) NOT NULL,
`code_display` VARCHAR(32) NOT NULL,
`created` INT NOT NULL,
PRIMARY KEY(id, namespace),
INDEX(created)
)";
break;
case self::SI_DRIVER_PGSQL:
$queries[] = "CREATE TABLE {$this->database_table} (
id character varying(40) NOT NULL,
namespace character varying(32) NOT NULL,
code character varying(32) NOT NULL,
code_display character varying(32) NOT NULL,
created integer NOT NULL,
CONSTRAINT pkey_id_namespace PRIMARY KEY (id, namespace)
)";
$queries[] = "CREATE INDEX ndx_created ON {$this->database_table} (created);";
break;
}
$this->pdo_conn->beginTransaction();
foreach($queries as $query) {
$result = $this->pdo_conn->query($query);
if (!$result) {
$err = $this->pdo_conn->errorInfo();
trigger_error("Failed to create table. {$err[1]}: {$err[2]}", E_USER_WARNING);
$this->pdo_conn->rollBack();
$this->pdo_conn = false;
return false;
}
}
$this->pdo_conn->commit();
return true;
}
/**
* Get a code from the sqlite database for ip address/captchaId.
*
* @return string|array Empty string if no code was found or has expired,
* otherwise returns the stored captcha code. If a captchaId is set, this
* returns an array with indices "code" and "code_disp"
*/
protected function getCodeFromDatabase()
{
$code = '';
if ($this->use_database == true && $this->pdo_conn) {
if (Securimage::$_captchaId !== null) {
$query = "SELECT * FROM {$this->database_table} WHERE id = ?";
$stmt = $this->pdo_conn->prepare($query);
$result = $stmt->execute(array(Securimage::$_captchaId));
} else {
$ip = $_SERVER['REMOTE_ADDR'];
$ns = $this->namespace;
// ip is stored in id column when no captchaId
$query = "SELECT * FROM {$this->database_table} WHERE id = ? AND namespace = ?";
$stmt = $this->pdo_conn->prepare($query);
$result = $stmt->execute(array($ip, $ns));
}
if (!$result) {
$err = $this->pdo_conn->errorInfo();
trigger_error("Failed to select code from database. {$err[0]}: {$err[1]}", E_USER_WARNING);
} else {
if ( ($row = $stmt->fetch()) !== false ) {
if (false == $this->isCodeExpired($row['created'])) {
if (Securimage::$_captchaId !== null) {
// return an array when using captchaId
$code = array('code' => $row['code'],
'code_disp' => $row['code_display']);
} else {
$code = $row['code'];
}
}
}
}
}
return $code;
}
/**
* Remove an entered code from the database
*/
protected function clearCodeFromDatabase()
{
if ($this->pdo_conn) {
$ip = $_SERVER['REMOTE_ADDR'];
$ns = $this->pdo_conn->quote($this->namespace);
$id = Securimage::$_captchaId;
if (empty($id)) {
$id = $ip; // if no captchaId set, IP address is captchaId.
}
$id = $this->pdo_conn->quote($id);
$query = sprintf("DELETE FROM %s WHERE id = %s AND namespace = %s",
$this->database_table, $id, $ns);
$result = $this->pdo_conn->query($query);
if (!$result) {
trigger_error("Failed to delete code from database.", E_USER_WARNING);
}
}
}
/**
* Deletes old codes from sqlite database
*/
protected function purgeOldCodesFromDatabase()
{
if ($this->use_database && $this->pdo_conn) {
$now = time();
$limit = (!is_numeric($this->expiry_time) || $this->expiry_time < 1) ? 86400 : $this->expiry_time;
$query = sprintf("DELETE FROM %s WHERE %s - created > %s",
$this->database_table,
$this->pdo_conn->quote($now, PDO::PARAM_INT),
$this->pdo_conn->quote($limit, PDO::PARAM_INT));
$result = $this->pdo_conn->query($query);
}
}
/**
* Checks to see if the captcha code has expired and cannot be used
* @param unknown_type $creation_time
*/
protected function isCodeExpired($creation_time)
{
$expired = true;
if (!is_numeric($this->expiry_time) || $this->expiry_time < 1) {
$expired = false;
} else if (time() - $creation_time < $this->expiry_time) {
$expired = false;
}
return $expired;
}
/**
* Generate a wav file given the $letters in the code
* @todo Add ability to merge 2 sound files together to have random background sounds
* @param array $letters
* @return string The binary contents of the wav file
*/
protected function generateWAV($letters)
{
$wavCaptcha = new WavFile();
$first = true; // reading first wav file
foreach ($letters as $letter) {
$letter = strtoupper($letter);
try {
$l = new WavFile($this->audio_path . '/' . $letter . '.wav');
if ($first) {
// set sample rate, bits/sample, and # of channels for file based on first letter
$wavCaptcha->setSampleRate($l->getSampleRate())
->setBitsPerSample($l->getBitsPerSample())
->setNumChannels($l->getNumChannels());
$first = false;
}
// append letter to the captcha audio
$wavCaptcha->appendWav($l);
// random length of silence between $audio_gap_min and $audio_gap_max
if ($this->audio_gap_max > 0 && $this->audio_gap_max > $this->audio_gap_min) {
$wavCaptcha->insertSilence( mt_rand($this->audio_gap_min, $this->audio_gap_max) / 1000.0 );
}
} catch (Exception $ex) {
// failed to open file, or the wav file is broken or not supported
// 2 wav files were not compatible, different # channels, bits/sample, or sample rate
throw $ex;
}
}
/********* Set up audio filters *****************************/
$filters = array();
if ($this->audio_use_noise == true) {
// use background audio - find random file
$noiseFile = $this->getRandomNoiseFile();
if ($noiseFile !== false && is_readable($noiseFile)) {
try {
$wavNoise = new WavFile($noiseFile, false);
} catch(Exception $ex) {
throw $ex;
}
// start at a random offset from the beginning of the wavfile
// in order to add more randomness
$randOffset = 0;
if ($wavNoise->getNumBlocks() > 2 * $wavCaptcha->getNumBlocks()) {
$randBlock = mt_rand(0, $wavNoise->getNumBlocks() - $wavCaptcha->getNumBlocks());
$wavNoise->readWavData($randBlock * $wavNoise->getBlockAlign(), $wavCaptcha->getNumBlocks() * $wavNoise->getBlockAlign());
} else {
$wavNoise->readWavData();
$randOffset = mt_rand(0, $wavNoise->getNumBlocks() - 1);
}
$mixOpts = array('wav' => $wavNoise,
'loop' => true,
'blockOffset' => $randOffset);
$filters[WavFile::FILTER_MIX] = $mixOpts;
$filters[WavFile::FILTER_NORMALIZE] = $this->audio_mix_normalization;
}
}
if ($this->degrade_audio == true) {
// add random noise.
// any noise level below 95% is intensely distorted and not pleasant to the ear
$filters[WavFile::FILTER_DEGRADE] = mt_rand(95, 98) / 100.0;
}
if (!empty($filters)) {
$wavCaptcha->filter($filters); // apply filters to captcha audio
}
return $wavCaptcha->__toString();
}
public function getRandomNoiseFile()
{
$return = false;
if ( ($dh = opendir($this->audio_noise_path)) !== false ) {
$list = array();
while ( ($file = readdir($dh)) !== false ) {
if ($file == '.' || $file == '..') continue;
if (strtolower(substr($file, -4)) != '.wav') continue;
$list[] = $file;
}
closedir($dh);
if (sizeof($list) > 0) {
$file = $list[array_rand($list, 1)];
$return = $this->audio_noise_path . DIRECTORY_SEPARATOR . $file;
}
}
return $return;
}
/**
* Return a wav file saying there was an error generating file
*
* @return string The binary audio contents
*/
protected function audioError()
{
return @file_get_contents(dirname(__FILE__) . '/audio/en/error.wav');
}
/**
* Checks to see if headers can be sent and if any error has been output to the browser
*
* @return bool true if headers haven't been sent and no output/errors will break audio/images, false if unsafe
*/
protected function canSendHeaders()
{
if (headers_sent()) {
// output has been flushed and headers have already been sent
return false;
} else if (strlen((string)ob_get_contents()) > 0) {
// headers haven't been sent, but there is data in the buffer that will break image and audio data
return false;
}
return true;
}
/**
* Return a random float between 0 and 0.9999
*
* @return float Random float between 0 and 0.9999
*/
function frand()
{
return 0.0001 * mt_rand(0,9999);
}
/**
* Convert an html color code to a Securimage_Color
* @param string $color
* @param Securimage_Color $default The defalt color to use if $color is invalid
*/
protected function initColor($color, $default)
{
if ($color == null) {
return new Securimage_Color($default);
} else if (is_string($color)) {
try {
return new Securimage_Color($color);
} catch(Exception $e) {
return new Securimage_Color($default);
}
} else if (is_array($color) && sizeof($color) == 3) {
return new Securimage_Color($color[0], $color[1], $color[2]);
} else {
return new Securimage_Color($default);
}
}
/**
* Error handler used when outputting captcha image or audio.
* This error handler helps determine if any errors raised would
* prevent captcha image or audio from displaying. If they have
* no effect on the output buffer or headers, true is returned so
* the script can continue processing.
* See https://github.com/dapphp/securimage/issues/15
*
* @param int $errno
* @param string $errstr
* @param string $errfile
* @param int $errline
* @param array $errcontext
* @return boolean true if handled, false if PHP should handle
*/
public function errorHandler($errno, $errstr, $errfile = '', $errline = 0, $errcontext = array())
{
// get the current error reporting level
$level = error_reporting();
// if error was supressed or $errno not set in current error level
if ($level == 0 || ($level & $errno) == 0) {
return true;
}
return false;
}
}
/**
* Color object for Securimage CAPTCHA
*
* @version 3.0
* @since 2.0
* @package Securimage
* @subpackage classes
*
*/
class Securimage_Color
{
public $r;
public $g;
public $b;
/**
* Create a new Securimage_Color object.<br />
* Constructor expects 1 or 3 arguments.<br />
* When passing a single argument, specify the color using HTML hex format,<br />
* when passing 3 arguments, specify each RGB component (from 0-255) individually.<br />
* $color = new Securimage_Color('#0080FF') or <br />
* $color = new Securimage_Color(0, 128, 255)
*
* @param string $color
* @throws Exception
*/
public function __construct($color = '#ffffff')
{
$args = func_get_args();
if (sizeof($args) == 0) {
$this->r = 255;
$this->g = 255;
$this->b = 255;
} else if (sizeof($args) == 1) {
// set based on html code
if (substr($color, 0, 1) == '#') {
$color = substr($color, 1);
}
if (strlen($color) != 3 && strlen($color) != 6) {
throw new InvalidArgumentException(
'Invalid HTML color code passed to Securimage_Color'
);
}
$this->constructHTML($color);
} else if (sizeof($args) == 3) {
$this->constructRGB($args[0], $args[1], $args[2]);
} else {
throw new InvalidArgumentException(
'Securimage_Color constructor expects 0, 1 or 3 arguments; ' . sizeof($args) . ' given'
);
}
}
/**
* Construct from an rgb triplet
* @param int $red The red component, 0-255
* @param int $green The green component, 0-255
* @param int $blue The blue component, 0-255
*/
protected function constructRGB($red, $green, $blue)
{
if ($red < 0) $red = 0;
if ($red > 255) $red = 255;
if ($green < 0) $green = 0;
if ($green > 255) $green = 255;
if ($blue < 0) $blue = 0;
if ($blue > 255) $blue = 255;
$this->r = $red;
$this->g = $green;
$this->b = $blue;
}
/**
* Construct from an html hex color code
* @param string $color
*/
protected function constructHTML($color)
{
if (strlen($color) == 3) {
$red = str_repeat(substr($color, 0, 1), 2);
$green = str_repeat(substr($color, 1, 1), 2);
$blue = str_repeat(substr($color, 2, 1), 2);
} else {
$red = substr($color, 0, 2);
$green = substr($color, 2, 2);
$blue = substr($color, 4, 2);
}
$this->r = hexdec($red);
$this->g = hexdec($green);
$this->b = hexdec($blue);
}
}