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3771 lines
130 KiB
3771 lines
130 KiB
<?php
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// error_reporting(E_ALL); ini_set('display_errors', 1); // uncomment this line for debugging
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/**
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* Project: Securimage: A PHP class dealing with CAPTCHA images, audio, and validation
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* File: securimage.php
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*
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* Copyright (c) 2018, Drew Phillips
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* Any modifications to the library should be indicated clearly in the source code
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* to inform users that the changes are not a part of the original software.
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*
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* @link https://www.phpcaptcha.org Securimage Homepage
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* @link https://www.phpcaptcha.org/latest.zip Download Latest Version
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* @link https://github.com/dapphp/securimage GitHub page
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* @link https://www.phpcaptcha.org/Securimage_Docs/ Online Documentation
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* @copyright 2018 Drew Phillips
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* @author Drew Phillips <[email protected]>
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* @version 3.6.7 (March 2018)
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* @package Securimage
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*
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*/
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/**
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ChangeLog
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3.6.7
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- Merge changes from 4.0.1-nextgen
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- Increase captcha difficulty
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- Add setting "use_text_angles". Enable to select a random angle and step value and draw each character at an angle in a step like fashion
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- Add setting "use_random_spaces". Enable to insert 1-3 spaces between a random group of letters some of the time
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- Add setting "use_random_baseline". Enable to draw letters at a random height instead of centered. Each character's baseline is a step up or down from the previous (not totally random)
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- Add setting "use_random_boxes". Enable to draw a bounding box around one or more characters at random
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- Improve performance of captcha generation when using distortion (perturbation) and noise (noise_level)
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- Enable image anti-aliasing
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- Make all text functions multibyte safe when using UTF-8 or other encodings for charsets and wordlists (using mbstring)
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3.6.6
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- Not critical: Fix potential HTML injection in example form via HTTP_USER_AGENT (CVE-2017-14077)
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3.6.5
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- Fix regex in replaceElements in securimage.js
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- Update examples
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- Exclude certain examples from Git autogenerated archives
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3.6.4
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- Fix XSS vulnerability in example_form.ajax.php (Discovered by RedTeam. advisory rt-sa-2016-002)
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- Update example_form.ajax.php to use Securimage::getCaptchaHtml()
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3.6.3
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- Add support for multibyte wordlist files
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- Fix code generation issues with UTF-8 charsets
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- Add parameter to getCaptchaHtml() method to control display components of captcha HTML
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- Fix database audio storage issue with multiple namespaces
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3.6.2
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- Support HTTP range requests with audio playback (iOS requirement)
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- Add optional config.inc.php for storing global configuration settings
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3.6.1
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- Fix copyElement bug in securimage.js for IE Flash fallback
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3.6
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- Implement CAPTCHA audio using HTML5 <audio> with optional Flash fallback
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- Support MP3 audio using LAME MP3 Encoder (Internet Explorer 9+ does not support WAV format in <audio> tags)
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- Add getCaptchaHtml() options to support full framework integration (ruifil)
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3.5.4
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- Fix email validation code in example form files
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- Fix backslashes in getCaptchaHtml for img attribute on Windows systems
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3.5.3
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- Add options for audio button to getCaptchaHtml(), fix urlencoding of flash parameters that was breaking button
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3.5.2
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- Add Securimage::getCaptchaHtml() for getting automatically generated captcha html code
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- Option for using SoX to add effects to captcha audio to make identification by neural networks more difficult
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- Add setNamespace() method
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- Add getTimeToSolve() method
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- Add session_status() check so session still starts if one had previously been opened and closed
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- Add .htaccess file to audio directory to deny access; update audio files
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- Option to skip checking of database tables during connection
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- Add composer.json to package, submit to packagist
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- Add font_ratio variable to determine size of font (github.com/wilkor)
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- Add hint if sqlite3 database is not writeable. Improve database error handling, add example database options to securimage_play.php
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- Fixed issue regarding database storage and math captcha breaking audio output (github.com/SoftwareAndOutsourcing)
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3.5.1
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- Fix XSS vulnerability in example_form.php (discovered by Gjoko Krstic - <[email protected]>)
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3.5
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- Release new version
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- MB string support for charlist
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- Modify audio file path to use language directories
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- Changed default captcha appearance
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3.2RC4
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- Add MySQL, PostgreSQL, and SQLite3 support for database storage
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- Deprecate "use_sqlite_db" option and remove SQLite2/sqlite_* functions
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- Add new captcha type that displays 2 dictionary words on one image
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- Update examples
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3.2RC3
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- Fix canSendHeaders() check which was breaking if a PHP startup error was issued
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3.2RC2
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- Add error handler (https://github.com/dapphp/securimage/issues/15)
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- Fix flash examples to use the correct value name for audio parameter
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3.2RC1
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- New audio captcha code. Faster, fully dynamic audio, full WAV support
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(Paul Voegler, Drew Phillips) <http://voegler.eu/pub/audio>
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- New Flash audio streaming button. User defined image and size supported
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- Additional options for customizing captcha (noise_level, send_headers,
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no_exit, no_session, display_value
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- Add captcha ID support. Uses sqlite and unique captcha IDs to track captchas,
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no session used
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- Add static methods for creating and validating captcha by ID
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- Automatic clearing of old codes from SQLite database
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3.0.3Beta
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- Add improved mixing function to WavFile class (Paul Voegler)
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- Improve performance and security of captcha audio (Paul Voegler, Drew Phillips)
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- Add option to use random file as background noise in captcha audio
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- Add new securimage options for audio files
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3.0.2Beta
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- Fix issue with session variables when upgrading from 2.0 - 3.0
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- Improve audio captcha, switch to use WavFile class, make mathematical captcha audio work
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3.0.1
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- Bugfix: removed use of deprecated variable in addSignature method that would cause errors with display_errors on
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3.0
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- Rewrite class using PHP5 OOP
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- Remove support for GD fonts, require FreeType
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- Remove support for multi-color codes
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- Add option to make codes case-sensitive
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- Add namespaces to support multiple captchas on a single page or page specific captchas
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- Add option to show simple math problems instead of codes
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- Remove support for mp3 files due to vulnerability in decoding mp3 audio files
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- Create new flash file to stream wav files instead of mp3
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- Changed to BSD license
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2.0.2
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- Fix pathing to make integration into libraries easier (Nathan Phillip Brink [email protected])
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2.0.1
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- Add support for browsers with cookies disabled (requires php5, sqlite) maps users to md5 hashed ip addresses and md5 hashed codes for security
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- 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)
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- Check for previous definition of image type constants (Mike Challis)
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- Fix mime type settings for audio output
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- Fixed color allocation issues with multiple colors and background images, consolidate allocation to one function
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- Ability to let codes expire after a given length of time
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- Allow HTML color codes to be passed to Securimage_Color (suggested by Mike Challis)
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2.0.0
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- Add mathematical distortion to characters (using code from HKCaptcha)
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- Improved session support
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- Added Securimage_Color class for easier color definitions
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- Add distortion to audio output to prevent binary comparison attack (proposed by Sven "SavageTiger" Hagemann [insecurity.nl])
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- Flash button to stream mp3 audio (Douglas Walsh www.douglaswalsh.net)
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- Audio output is mp3 format by default
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- Change font to AlteHaasGrotesk by yann le coroller
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- Some code cleanup
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1.0.4 (unreleased)
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- Ability to output audible codes in mp3 format to stream from flash
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1.0.3.1
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- Error reading from wordlist in some cases caused words to be cut off 1 letter short
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1.0.3
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- Removed shadow_text from code which could cause an undefined property error due to removal from previous version
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1.0.2
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- Audible CAPTCHA Code wav files
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- Create codes from a word list instead of random strings
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1.0
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- Added the ability to use a selected character set, rather than a-z0-9 only.
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- Added the multi-color text option to use different colors for each letter.
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- Switched to automatic session handling instead of using files for code storage
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- Added GD Font support if ttf support is not available. Can use internal GD fonts or load new ones.
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- Added the ability to set line thickness
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- Added option for drawing arced lines over letters
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- Added ability to choose image type for output
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*/
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/**
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* Securimage CAPTCHA Class.
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*
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* A class for creating and validating secure CAPTCHA images and audio.
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*
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* The class contains many options regarding appearance, security, storage of
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* captcha data and image/audio generation options.
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*
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* @package Securimage
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* @subpackage classes
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* @author Drew Phillips <[email protected]>
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*
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*/
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class Securimage
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{
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// All of the public variables below are securimage options
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// They can be passed as an array to the Securimage constructor, set below,
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// or set from securimage_show.php and securimage_play.php
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/**
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* Constant for rendering captcha as a JPEG image
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* @var int
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*/
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const SI_IMAGE_JPEG = 1;
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/**
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* Constant for rendering captcha as a PNG image (default)
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* @var int
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*/
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const SI_IMAGE_PNG = 2;
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/**
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* Constant for rendering captcha as a GIF image
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* @var int
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*/
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const SI_IMAGE_GIF = 3;
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/**
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* Constant for generating a normal alphanumeric captcha based on the
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* character set
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*
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* @see Securimage::$charset charset property
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* @var int
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*/
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const SI_CAPTCHA_STRING = 0;
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/**
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* Constant for generating a captcha consisting of a simple math problem
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*
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* @var int
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*/
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const SI_CAPTCHA_MATHEMATIC = 1;
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/**
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* Constant for generating a word based captcha using 2 words from a list
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*
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* @var int
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*/
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const SI_CAPTCHA_WORDS = 2;
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/**
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* MySQL option identifier for database storage option
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*
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* @var string
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*/
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const SI_DRIVER_MYSQL = 'mysql';
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/**
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* PostgreSQL option identifier for database storage option
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*
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* @var string
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*/
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const SI_DRIVER_PGSQL = 'pgsql';
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/**
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* SQLite option identifier for database storage option
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*
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* @var string
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*/
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const SI_DRIVER_SQLITE3 = 'sqlite';
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/**
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* getCaptchaHtml() display constant for HTML Captcha Image
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*
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* @var integer
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*/
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const HTML_IMG = 1;
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/**
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* getCaptchaHtml() display constant for HTML5 Audio code
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*
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* @var integer
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*/
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const HTML_AUDIO = 2;
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/**
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* getCaptchaHtml() display constant for Captcha Input text box
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*
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* @var integer
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*/
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const HTML_INPUT = 4;
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/**
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* getCaptchaHtml() display constant for Captcha Text HTML label
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*
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* @var integer
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*/
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const HTML_INPUT_LABEL = 8;
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/**
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* getCaptchaHtml() display constant for HTML Refresh button
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*
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* @var integer
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*/
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const HTML_ICON_REFRESH = 16;
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/**
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* getCaptchaHtml() display constant for all HTML elements (default)
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*
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* @var integer
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*/
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const HTML_ALL = 0xffffffff;
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/*%*********************************************************************%*/
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// Properties
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/**
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* The width of the captcha image
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* @var int
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*/
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public $image_width = 215;
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/**
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* The height of the captcha image
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* @var int
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*/
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public $image_height = 80;
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/**
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* Font size is calculated by image height and this ratio. Leave blank for
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* default ratio of 0.4.
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*
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* Valid range: 0.1 - 0.99.
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*
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* Depending on image_width, values > 0.6 are probably too large and
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* values < 0.3 are too small.
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*
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* @var float
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*/
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public $font_ratio;
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/**
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* The type of the image, default = png
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*
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* @see Securimage::SI_IMAGE_PNG SI_IMAGE_PNG
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* @see Securimage::SI_IMAGE_JPEG SI_IMAGE_JPEG
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* @see Securimage::SI_IMAGE_GIF SI_IMAGE_GIF
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* @var int
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*/
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public $image_type = self::SI_IMAGE_PNG;
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/**
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* The background color of the captcha
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* @var Securimage_Color|string
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*/
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public $image_bg_color = '#ffffff';
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/**
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* The color of the captcha text
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* @var Securimage_Color|string
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*/
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public $text_color = '#707070';
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/**
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* The color of the lines over the captcha
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* @var Securimage_Color|string
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*/
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public $line_color = '#707070';
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/**
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* The color of the noise that is drawn
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* @var Securimage_Color|string
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*/
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public $noise_color = '#707070';
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/**
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* How transparent to make the text.
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*
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* 0 = completely opaque, 100 = invisible
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*
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* @var int
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*/
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public $text_transparency_percentage = 20;
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/**
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* Whether or not to draw the text transparently.
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*
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* true = use transparency, false = no transparency
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*
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* @var bool
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*/
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public $use_transparent_text = true;
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/**
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* The length of the captcha code
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* @var int
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*/
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public $code_length = 6;
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/**
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* Display random spaces in the captcha text on the image
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*
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* @var bool true to insert random spacing between groups of letters
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*/
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public $use_random_spaces = false;
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/**
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* Draw each character at an angle with random starting angle and increase/decrease per character
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* @var bool true to use random angles, false to draw each character normally
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*/
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public $use_text_angles = false;
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/**
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* Instead of centering text vertically in the image, the baseline of each character is
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* randomized in such a way that the next character is drawn slightly higher or lower than
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* the previous in a step-like fashion.
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*
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* @var bool true to use random baselines, false to center text in image
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*/
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public $use_random_baseline = false;
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/**
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* Draw a bounding box around some characters at random. 20% of the time, random boxes
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* may be drawn around 0 or more characters on the image.
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*
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* @var bool true to randomly draw boxes around letters, false not to
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*/
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public $use_random_boxes = false;
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/**
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* Whether the captcha should be case sensitive or not.
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*
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* Not recommended, use only for maximum protection.
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*
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* @var bool
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*/
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public $case_sensitive = false;
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/**
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* The character set to use for generating the captcha code
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* @var string
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*/
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public $charset = 'abcdefghijkmnopqrstuvwxzyABCDEFGHJKLMNPQRSTUVWXZY0123456789';
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/**
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* How long in seconds a captcha remains valid, after this time it will be
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* considered incorrect.
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*
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* @var int
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*/
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public $expiry_time = 900;
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/**
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* The session name securimage should use.
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*
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* Only use if your application uses a custom session name (e.g. Joomla).
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* It is recommended to set this value here so it is used by all securimage
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* scripts (i.e. securimage_show.php)
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*
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* @var string
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*/
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public $session_name = null;
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/**
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* true to use the wordlist file, false to generate random captcha codes
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* @var bool
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*/
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public $use_wordlist = false;
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/**
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* The level of distortion.
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*
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* 0.75 = normal, 1.0 = very high distortion
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*
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* @var double
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*/
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public $perturbation = 0.85;
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/**
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* How many lines to draw over the captcha code to increase security
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* @var int
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*/
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public $num_lines = 5;
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/**
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* The level of noise (random dots) to place on the image, 0-10
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* @var int
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*/
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public $noise_level = 2;
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/**
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* The signature text to draw on the bottom corner of the image
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* @var string
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*/
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public $image_signature = '';
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/**
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* The color of the signature text
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* @var Securimage_Color|string
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*/
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public $signature_color = '#707070';
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/**
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* The path to the ttf font file to use for the signature text.
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* Defaults to $ttf_file (AHGBold.ttf)
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*
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* @see Securimage::$ttf_file
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* @var string
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*/
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public $signature_font;
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/**
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* No longer used.
|
|
*
|
|
* Use an SQLite database to store data (for users that do not support cookies)
|
|
*
|
|
* @var bool
|
|
* @see Securimage::$database_driver database_driver property
|
|
* @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;
|
|
|
|
/**
|
|
* Whether or not to skip checking if Securimage tables exist when using a
|
|
* database.
|
|
*
|
|
* Turn this to true once database functionality is working to improve
|
|
* performance.
|
|
*
|
|
* @var bool true to not check if captcha_codes tables are set up, false
|
|
* to check (and create if necessary)
|
|
*/
|
|
public $skip_table_check = 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 == sqlite and does
|
|
* not apply when no database is used, or when using MySQL or PostgreSQL.
|
|
*
|
|
* On *nix, file must have permissions of 0666.
|
|
*
|
|
* **Make sure the directory containing this file is NOT web accessible**
|
|
*
|
|
* @var string
|
|
*/
|
|
public $database_file;
|
|
|
|
/**
|
|
* The type of captcha to create.
|
|
*
|
|
* Either alphanumeric based on *charset*, a simple math problem, or an
|
|
* image consisting of 2 words from the word list.
|
|
*
|
|
* @see Securimage::SI_CAPTCHA_STRING SI_CAPTCHA_STRING
|
|
* @see Securimage::SI_CAPTCHA_MATHEMATIC SI_CAPTCHA_MATHEMATIC
|
|
* @see Securimage::SI_CAPTCHA_WORDS SI_CAPTCHA_WORDS
|
|
* @see Securimage::$charset charset property
|
|
* @see Securimage::$wordlist_file wordlist_file property
|
|
* @var int
|
|
*/
|
|
public $captcha_type = self::SI_CAPTCHA_STRING; // or self::SI_CAPTCHA_MATHEMATIC, or self::SI_CAPTCHA_WORDS;
|
|
|
|
/**
|
|
* The captcha namespace used for having multiple captchas on a page or
|
|
* to separate captchas from differen forms on your site.
|
|
* Example:
|
|
*
|
|
* <?php
|
|
* // use <img src="securimage_show.php?namespace=contact_form">
|
|
* // or manually in securimage_show.php
|
|
* $img->setNamespace('contact_form');
|
|
*
|
|
* // in form validator
|
|
* $img->setNamespace('contact_form');
|
|
* if ($img->check($code) == true) {
|
|
* echo "Valid!";
|
|
* }
|
|
*
|
|
* @var string
|
|
*/
|
|
public $namespace;
|
|
|
|
/**
|
|
* The TTF 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;
|
|
|
|
/**
|
|
* Character encoding of the wordlist file.
|
|
* Requires PHP Multibyte String (mbstring) support.
|
|
* Allows word list to contain characters other than US-ASCII (requires compatible TTF font).
|
|
*
|
|
* @var string The character encoding (e.g. UTF-8, UTF-7, EUC-JP, GB2312)
|
|
* @see http://php.net/manual/en/mbstring.supported-encodings.php
|
|
* @since 3.6.3
|
|
*/
|
|
public $wordlist_file_encoding = null;
|
|
|
|
/**
|
|
* The directory to scan for background images, if set a random background
|
|
* will be chosen from this folder
|
|
*
|
|
* @var string
|
|
*/
|
|
public $background_directory;
|
|
|
|
/**
|
|
* No longer used
|
|
*
|
|
* The path to the SQLite database file to use
|
|
*
|
|
* @deprecated 3.2RC4
|
|
* @see Securimage::$database_file database_file property
|
|
* @var string
|
|
*/
|
|
public $sqlite_database;
|
|
|
|
/**
|
|
* The path to the audio files to be used for audio captchas.
|
|
*
|
|
* Can also be set in securimage_play.php
|
|
*
|
|
* Example:
|
|
*
|
|
* $img->audio_path = '/home/yoursite/public_html/securimage/audio/en/';
|
|
*
|
|
* @var string
|
|
*/
|
|
public $audio_path;
|
|
|
|
/**
|
|
* Use SoX (The Swiss Army knife of audio manipulation) for audio effects
|
|
* and processing.
|
|
*
|
|
* Using SoX should make it more difficult for bots to solve audio captchas
|
|
*
|
|
* @see Securimage::$sox_binary_path sox_binary_path property
|
|
* @var bool true to use SoX, false to use PHP
|
|
*/
|
|
public $audio_use_sox = false;
|
|
|
|
/**
|
|
* The path to the SoX binary on your system
|
|
*
|
|
* @var string
|
|
*/
|
|
public $sox_binary_path = '/usr/bin/sox';
|
|
|
|
/**
|
|
* The path to the lame (mp3 encoder) binary on your system
|
|
* Static so that Securimage::getCaptchaHtml() has access to this value.
|
|
*
|
|
* @since 3.6
|
|
* @var string
|
|
*/
|
|
public static $lame_binary_path = '/usr/bin/lame';
|
|
|
|
/**
|
|
* The path to the directory containing audio files that will be selected
|
|
* randomly and mixed with the captcha audio.
|
|
*
|
|
* @var string
|
|
*/
|
|
public $audio_noise_path;
|
|
|
|
/**
|
|
* Whether or not to mix background noise files into captcha audio
|
|
*
|
|
* Mixing random background audio with noise can help improve security of
|
|
* audio captcha.
|
|
*
|
|
* Default: securimage/audio/noise
|
|
*
|
|
* @since 3.0.3
|
|
* @see Securimage::$audio_noise_path audio_noise_path property
|
|
* @var bool true = mix, false = no
|
|
*/
|
|
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.
|
|
*
|
|
* Default: 0.6
|
|
*
|
|
* Valid:
|
|
* >= 1
|
|
* Normalize by multiplying by the threshold (boost - positive gain).
|
|
* A value of 1 in effect means no normalization (and results in clipping).
|
|
*
|
|
* <= -1
|
|
* Normalize by dividing by the the absolute value of threshold (attenuate - negative gain).
|
|
* A factor of 2 (-2) is about 6dB reduction in volume.
|
|
*
|
|
* [0, 1) (open inverval - not including 1)
|
|
* The threshold above which amplitudes are comressed logarithmically.
|
|
* e.g. 0.6 to leave amplitudes up to 60% "as is" and compressabove.
|
|
*
|
|
* (-1, 0) (open inverval - not including -1 and 0)
|
|
* The threshold above which amplitudes are comressed linearly.
|
|
* e.g. -0.6 to leave amplitudes up to 60% "as is" and compress above.
|
|
*
|
|
* @since 3.0.4
|
|
* @var float
|
|
*/
|
|
public $audio_mix_normalization = 0.8;
|
|
|
|
/**
|
|
* Whether or not to degrade audio by introducing random noise.
|
|
*
|
|
* Current research shows this may not increase the security of audible
|
|
* captchas.
|
|
*
|
|
* 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 = 3000;
|
|
|
|
/**
|
|
* The file path for logging errors from audio (default __DIR__)
|
|
*
|
|
* @var string|null
|
|
*/
|
|
public $log_path = null;
|
|
|
|
/**
|
|
* The name of the log file for logging audio errors
|
|
*
|
|
* @var string|null (defualt si_error.log)
|
|
*/
|
|
public $log_file = null;
|
|
|
|
/**
|
|
* Captcha ID if using static captcha
|
|
* @var string Unique captcha id
|
|
*/
|
|
protected static $_captchaId = null;
|
|
|
|
/**
|
|
* The GD image resource of the captcha image
|
|
*
|
|
* @var resource
|
|
*/
|
|
protected $im;
|
|
|
|
/**
|
|
* A temporary GD image resource of the captcha image for distortion
|
|
*
|
|
* @var resource
|
|
*/
|
|
protected $tmpimg;
|
|
|
|
/**
|
|
* The background image GD resource
|
|
* @var string
|
|
*/
|
|
protected $bgimg;
|
|
|
|
/**
|
|
* Scale factor for magnification of distorted captcha image
|
|
*
|
|
* @var int
|
|
*/
|
|
protected $iscale = 2;
|
|
|
|
/**
|
|
* Absolute path to securimage directory.
|
|
*
|
|
* This is calculated at runtime
|
|
*
|
|
* @var string
|
|
*/
|
|
public $securimage_path = null;
|
|
|
|
/**
|
|
* The captcha challenge value.
|
|
*
|
|
* Either the case-sensitive/insensitive word captcha, or the solution to
|
|
* the math captcha.
|
|
*
|
|
* @var string|bool Captcha challenge value
|
|
*/
|
|
protected $code;
|
|
|
|
/**
|
|
* The display value of the captcha to draw on the image
|
|
*
|
|
* Either 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;
|
|
|
|
/**
|
|
* Alternate text to draw as the captcha image text
|
|
*
|
|
* 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;
|
|
|
|
/**
|
|
* Time (in seconds) that the captcha was solved in (correctly or incorrectly).
|
|
*
|
|
* This is from the time of code creation, to when validation was attempted.
|
|
*
|
|
* @var int
|
|
*/
|
|
protected $_timeToSolve = 0;
|
|
|
|
/**
|
|
* 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 PDO|bool
|
|
*/
|
|
protected $pdo_conn;
|
|
|
|
/**
|
|
* The GD color for the background color
|
|
*
|
|
* @var int
|
|
*/
|
|
protected $gdbgcolor;
|
|
|
|
/**
|
|
* The GD color for the text color
|
|
*
|
|
* @var int
|
|
*/
|
|
protected $gdtextcolor;
|
|
|
|
/**
|
|
* The GD color for the line color
|
|
*
|
|
* @var int
|
|
*/
|
|
protected $gdlinecolor;
|
|
|
|
/**
|
|
* The GD color for the signature text color
|
|
*
|
|
* @var int
|
|
*/
|
|
protected $gdsignaturecolor;
|
|
|
|
/**
|
|
* Create a new securimage object, pass options to set in the constructor.
|
|
*
|
|
* The object can then be used to display a captcha, play an audible captcha, or validate a submission.
|
|
*
|
|
* @param array $options Options to initialize the class. May be any class property.
|
|
*
|
|
* $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);
|
|
*
|
|
*/
|
|
public function __construct($options = array())
|
|
{
|
|
$this->securimage_path = dirname(__FILE__);
|
|
|
|
if (!is_array($options)) {
|
|
trigger_error(
|
|
'$options passed to Securimage::__construct() must be an array. ' .
|
|
gettype($options) . ' given',
|
|
E_USER_WARNING
|
|
);
|
|
$options = array();
|
|
}
|
|
|
|
if (function_exists('mb_internal_encoding')) {
|
|
mb_internal_encoding('UTF-8');
|
|
}
|
|
|
|
// check for and load settings from custom config file
|
|
$config_file = null;
|
|
|
|
if (file_exists(dirname(__FILE__) . '/config.inc.php')) {
|
|
$config_file = dirname(__FILE__) . '/config.inc.php';
|
|
}
|
|
if (isset($options['config_file']) && file_exists($options['config_file'])) {
|
|
$config_file = $options['config_file'];
|
|
}
|
|
|
|
if ($config_file) {
|
|
$settings = include $config_file;
|
|
|
|
if (is_array($settings)) {
|
|
$options = array_merge($settings, $options);
|
|
}
|
|
}
|
|
|
|
if (is_array($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)) {
|
|
$this->send_headers = true;
|
|
}
|
|
|
|
if (is_null($this->log_path)) {
|
|
$this->log_path = __DIR__;
|
|
}
|
|
|
|
if (is_null($this->log_file)) {
|
|
$this->log_file = 'securimage.error_log';
|
|
}
|
|
|
|
if ($this->no_session != true) {
|
|
// Initialize session or attach to existing
|
|
if ( session_id() == '' || (function_exists('session_status') && PHP_SESSION_NONE == session_status()) ) { // no session has been started yet (or it was previousy closed), 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 (if exists).
|
|
*
|
|
* @param bool $new If true, generates a new challenge and returns and ID. If false, the existing captcha ID is returned, or null if none exists.
|
|
* @param array $options Additional options to be passed to Securimage.
|
|
* $options must include database settings if they are not set directly in securimage.php
|
|
*
|
|
* @return null|string Returns null if no captcha id set and new was false, or the captcha ID
|
|
*/
|
|
public static function getCaptchaId($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;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Generates a new challenge and serves a captcha image.
|
|
*
|
|
* Appropriate headers will be sent to the browser unless the *send_headers* option is false.
|
|
*
|
|
* @param string $background_image The absolute or relative path to the background image to use as the background of the captcha image.
|
|
*
|
|
* $img = new Securimage();
|
|
* $img->code_length = 6;
|
|
* $img->num_lines = 5;
|
|
* $img->noise_level = 5;
|
|
*
|
|
* $img->show(); // sends the image and appropriate headers to browser
|
|
* exit;
|
|
*/
|
|
public function show($background_image = '')
|
|
{
|
|
set_error_handler(array(&$this, 'errorHandler'));
|
|
|
|
if($background_image != '' && is_readable($background_image)) {
|
|
$this->bgimg = $background_image;
|
|
}
|
|
|
|
$this->doImage();
|
|
}
|
|
|
|
/**
|
|
* Checks a given code against the correct value from the session and/or database.
|
|
*
|
|
* @param string $code The captcha code to check
|
|
*
|
|
* $code = $_POST['code'];
|
|
* $img = new Securimage();
|
|
* if ($img->check($code) == true) {
|
|
* $captcha_valid = true;
|
|
* } else {
|
|
* $captcha_valid = false;
|
|
* }
|
|
*
|
|
* @return bool true if the given code was correct, false if not.
|
|
*/
|
|
public function check($code)
|
|
{
|
|
if (!is_string($code)) {
|
|
trigger_error("The \$code parameter passed to Securimage::check() must be a string, " . gettype($code) . " given", E_USER_NOTICE);
|
|
$code = '';
|
|
}
|
|
|
|
$this->code_entered = $code;
|
|
$this->validate();
|
|
return $this->correct_code;
|
|
}
|
|
|
|
/**
|
|
* Returns HTML code for displaying the captcha image, audio button, and form text input.
|
|
*
|
|
* Options can be specified to modify the output of the HTML. Accepted options:
|
|
*
|
|
* 'securimage_path':
|
|
* Optional: The URI to where securimage is installed (e.g. /securimage)
|
|
* 'show_image_url':
|
|
* Path to the securimage_show.php script (useful when integrating with a framework or moving outside the securimage directory)
|
|
* This will be passed as a urlencoded string to the <img> tag for outputting the captcha image
|
|
* 'audio_play_url':
|
|
* Same as show_image_url, except this indicates the URL of the audio playback script
|
|
* 'image_id':
|
|
* A string that sets the "id" attribute of the captcha image (default: captcha_image)
|
|
* 'image_alt_text':
|
|
* The alt text of the captcha image (default: CAPTCHA Image)
|
|
* 'show_audio_button':
|
|
* true/false Whether or not to show the audio button (default: true)
|
|
* 'disable_flash_fallback':)
|
|
* Allow only HTML5 audio and disable Flash fallback
|
|
* 'show_refresh_button':
|
|
* true/false Whether or not to show a button to refresh the image (default: true)
|
|
* 'audio_icon_url':
|
|
* URL to the image used for showing the HTML5 audio icon
|
|
* 'icon_size':
|
|
* Size (for both height & width) in pixels of the audio and refresh buttons
|
|
* 'show_text_input':
|
|
* true/false Whether or not to show the text input for the captcha (default: true)
|
|
* 'refresh_alt_text':
|
|
* Alt text for the refresh image (default: Refresh Image)
|
|
* 'refresh_title_text':
|
|
* Title text for the refresh image link (default: Refresh Image)
|
|
* 'input_id':
|
|
* A string that sets the "id" attribute of the captcha text input (default: captcha_code)
|
|
* 'input_name':
|
|
* A string that sets the "name" attribute of the captcha text input (default: same as input_id)
|
|
* 'input_text':
|
|
* A string that sets the text of the label for the captcha text input (default: Type the text:)
|
|
* 'input_attributes':
|
|
* An array of additional HTML tag attributes to pass to the text input tag (default: empty)
|
|
* 'image_attributes':
|
|
* An array of additional HTML tag attributes to pass to the captcha image tag (default: empty)
|
|
* 'error_html':
|
|
* Optional HTML markup to be shown above the text input field
|
|
* 'namespace':
|
|
* The optional captcha namespace to use for showing the image and playing back the audio. Namespaces are for using multiple captchas on the same page.
|
|
*
|
|
* @param array $options Array of options for modifying the HTML code.
|
|
* @param int $parts Securiage::HTML_* constant controlling what component of the captcha HTML to display
|
|
*
|
|
* @return string The generated HTML code for displaying the captcha
|
|
*/
|
|
public static function getCaptchaHtml($options = array(), $parts = Securimage::HTML_ALL)
|
|
{
|
|
static $javascript_init = false;
|
|
|
|
if (!isset($options['securimage_path'])) {
|
|
$docroot = (isset($_SERVER['DOCUMENT_ROOT'])) ? $_SERVER['DOCUMENT_ROOT'] : substr($_SERVER['SCRIPT_FILENAME'], 0, -strlen($_SERVER['SCRIPT_NAME']));
|
|
$docroot = realpath($docroot);
|
|
$sipath = dirname(__FILE__);
|
|
$securimage_path = str_replace($docroot, '', $sipath);
|
|
} else {
|
|
$securimage_path = $options['securimage_path'];
|
|
}
|
|
|
|
$show_image_url = (isset($options['show_image_url'])) ? $options['show_image_url'] : null;
|
|
$image_id = (isset($options['image_id'])) ? $options['image_id'] : 'captcha_image';
|
|
$image_alt = (isset($options['image_alt_text'])) ? $options['image_alt_text'] : 'CAPTCHA Image';
|
|
$show_audio_btn = (isset($options['show_audio_button'])) ? (bool)$options['show_audio_button'] : true;
|
|
$disable_flash_fbk = (isset($options['disable_flash_fallback'])) ? (bool)$options['disable_flash_fallback'] : false;
|
|
$show_refresh_btn = (isset($options['show_refresh_button'])) ? (bool)$options['show_refresh_button'] : true;
|
|
$refresh_icon_url = (isset($options['refresh_icon_url'])) ? $options['refresh_icon_url'] : null;
|
|
$audio_but_bg_col = (isset($options['audio_button_bgcol'])) ? $options['audio_button_bgcol'] : '#ffffff';
|
|
$audio_icon_url = (isset($options['audio_icon_url'])) ? $options['audio_icon_url'] : null;
|
|
$loading_icon_url = (isset($options['loading_icon_url'])) ? $options['loading_icon_url'] : null;
|
|
$icon_size = (isset($options['icon_size'])) ? $options['icon_size'] : 32;
|
|
$audio_play_url = (isset($options['audio_play_url'])) ? $options['audio_play_url'] : null;
|
|
$audio_swf_url = (isset($options['audio_swf_url'])) ? $options['audio_swf_url'] : null;
|
|
$show_input = (isset($options['show_text_input'])) ? (bool)$options['show_text_input'] : true;
|
|
$refresh_alt = (isset($options['refresh_alt_text'])) ? $options['refresh_alt_text'] : 'Refresh Image';
|
|
$refresh_title = (isset($options['refresh_title_text'])) ? $options['refresh_title_text'] : 'Refresh Image';
|
|
$input_text = (isset($options['input_text'])) ? $options['input_text'] : 'Type the text:';
|
|
$input_id = (isset($options['input_id'])) ? $options['input_id'] : 'captcha_code';
|
|
$input_name = (isset($options['input_name'])) ? $options['input_name'] : $input_id;
|
|
$input_attrs = (isset($options['input_attributes'])) ? $options['input_attributes'] : array();
|
|
$image_attrs = (isset($options['image_attributes'])) ? $options['image_attributes'] : array();
|
|
$error_html = (isset($options['error_html'])) ? $options['error_html'] : null;
|
|
$namespace = (isset($options['namespace'])) ? $options['namespace'] : '';
|
|
|
|
$rand = md5(uniqid($_SERVER['REMOTE_PORT'], true));
|
|
$securimage_path = rtrim($securimage_path, '/\\');
|
|
$securimage_path = str_replace('\\', '/', $securimage_path);
|
|
|
|
$image_attr = '';
|
|
if (!is_array($image_attrs)) $image_attrs = array();
|
|
if (!isset($image_attrs['style'])) $image_attrs['style'] = 'float: left; padding-right: 5px';
|
|
$image_attrs['id'] = $image_id;
|
|
|
|
$show_path = $securimage_path . '/securimage_show.php?';
|
|
if ($show_image_url) {
|
|
if (parse_url($show_image_url, PHP_URL_QUERY)) {
|
|
$show_path = "{$show_image_url}&";
|
|
} else {
|
|
$show_path = "{$show_image_url}?";
|
|
}
|
|
}
|
|
if (!empty($namespace)) {
|
|
$show_path .= sprintf('namespace=%s&', $namespace);
|
|
}
|
|
$image_attrs['src'] = $show_path . $rand;
|
|
|
|
$image_attrs['alt'] = $image_alt;
|
|
|
|
foreach($image_attrs as $name => $val) {
|
|
$image_attr .= sprintf('%s="%s" ', $name, htmlspecialchars($val));
|
|
}
|
|
|
|
$swf_path = $securimage_path . '/securimage_play.swf';
|
|
$play_path = $securimage_path . '/securimage_play.php?';
|
|
$icon_path = $securimage_path . '/images/audio_icon.png';
|
|
$load_path = $securimage_path . '/images/loading.png';
|
|
$js_path = $securimage_path . '/securimage.js';
|
|
|
|
if (!empty($audio_icon_url)) {
|
|
$icon_path = $audio_icon_url;
|
|
}
|
|
|
|
if (!empty($loading_icon_url)) {
|
|
$load_path = $loading_icon_url;
|
|
}
|
|
|
|
if (!empty($audio_play_url)) {
|
|
if (parse_url($audio_play_url, PHP_URL_QUERY)) {
|
|
$play_path = "{$audio_play_url}&";
|
|
} else {
|
|
$play_path = "{$audio_play_url}?";
|
|
}
|
|
}
|
|
|
|
if (!empty($namespace)) {
|
|
$play_path .= sprintf('namespace=%s&', $namespace);
|
|
}
|
|
|
|
if (!empty($audio_swf_url)) {
|
|
$swf_path = $audio_swf_url;
|
|
}
|
|
|
|
$audio_obj = $image_id . '_audioObj';
|
|
$html = '';
|
|
|
|
if ( ($parts & Securimage::HTML_IMG) > 0) {
|
|
$html .= sprintf('<img %s/>', $image_attr);
|
|
}
|
|
|
|
if ( ($parts & Securimage::HTML_AUDIO) > 0 && $show_audio_btn) {
|
|
// html5 audio
|
|
$html .= sprintf('<div id="%s_audio_div">', $image_id) . "\n" .
|
|
sprintf('<audio id="%s_audio" preload="none" style="display: none">', $image_id) . "\n";
|
|
|
|
// check for existence and executability of LAME binary
|
|
// prefer mp3 over wav by sourcing it first, if available
|
|
if (is_executable(Securimage::$lame_binary_path)) {
|
|
$html .= sprintf('<source id="%s_source_mp3" src="%sid=%s&format=mp3" type="audio/mpeg">', $image_id, $play_path, uniqid()) . "\n";
|
|
}
|
|
|
|
// output wav source
|
|
$html .= sprintf('<source id="%s_source_wav" src="%sid=%s" type="audio/wav">', $image_id, $play_path, uniqid()) . "\n";
|
|
|
|
// flash audio button
|
|
if (!$disable_flash_fbk) {
|
|
$html .= sprintf('<object type="application/x-shockwave-flash" data="%s?bgcol=%s&icon_file=%s&audio_file=%s" height="%d" width="%d">',
|
|
htmlspecialchars($swf_path),
|
|
urlencode($audio_but_bg_col),
|
|
urlencode($icon_path),
|
|
urlencode(html_entity_decode($play_path)),
|
|
$icon_size, $icon_size
|
|
);
|
|
|
|
$html .= sprintf('<param name="movie" value="%s?bgcol=%s&icon_file=%s&audio_file=%s">',
|
|
htmlspecialchars($swf_path),
|
|
urlencode($audio_but_bg_col),
|
|
urlencode($icon_path),
|
|
urlencode(html_entity_decode($play_path))
|
|
);
|
|
|
|
$html .= '</object><br />';
|
|
}
|
|
|
|
// html5 audio close
|
|
$html .= "</audio>\n</div>\n";
|
|
|
|
// html5 audio controls
|
|
$html .= sprintf('<div id="%s_audio_controls">', $image_id) . "\n" .
|
|
sprintf('<a tabindex="-1" class="captcha_play_button" href="%sid=%s" onclick="return false">',
|
|
$play_path, uniqid()
|
|
) . "\n" .
|
|
sprintf('<img class="captcha_play_image" height="%d" width="%d" src="%s" alt="Play CAPTCHA Audio" style="border: 0px">', $icon_size, $icon_size, htmlspecialchars($icon_path)) . "\n" .
|
|
sprintf('<img class="captcha_loading_image rotating" height="%d" width="%d" src="%s" alt="Loading audio" style="display: none">', $icon_size, $icon_size, htmlspecialchars($load_path)) . "\n" .
|
|
"</a>\n<noscript>Enable Javascript for audio controls</noscript>\n" .
|
|
"</div>\n";
|
|
|
|
// html5 javascript
|
|
if (!$javascript_init) {
|
|
$html .= sprintf('<script type="text/javascript" src="%s"></script>', $js_path) . "\n";
|
|
$javascript_init = true;
|
|
}
|
|
$html .= '<script type="text/javascript">' .
|
|
"$audio_obj = new SecurimageAudio({ audioElement: '{$image_id}_audio', controlsElement: '{$image_id}_audio_controls' });" .
|
|
"</script>\n";
|
|
}
|
|
|
|
if ( ($parts & Securimage::HTML_ICON_REFRESH) > 0 && $show_refresh_btn) {
|
|
$icon_path = $securimage_path . '/images/refresh.png';
|
|
if ($refresh_icon_url) {
|
|
$icon_path = $refresh_icon_url;
|
|
}
|
|
$img_tag = sprintf('<img height="%d" width="%d" src="%s" alt="%s" onclick="this.blur()" style="border: 0px; vertical-align: bottom">',
|
|
$icon_size, $icon_size, htmlspecialchars($icon_path), htmlspecialchars($refresh_alt));
|
|
|
|
$html .= sprintf('<a tabindex="-1" style="border: 0" href="#" title="%s" onclick="%sdocument.getElementById(\'%s\').src = \'%s\' + Math.random(); this.blur(); return false">%s</a><br>',
|
|
htmlspecialchars($refresh_title),
|
|
($audio_obj) ? "if (typeof window.{$audio_obj} !== 'undefined') {$audio_obj}.refresh(); " : '',
|
|
$image_id,
|
|
$show_path,
|
|
$img_tag
|
|
);
|
|
}
|
|
|
|
if ($parts == Securimage::HTML_ALL) {
|
|
$html .= '<div style="clear: both"></div>';
|
|
}
|
|
|
|
if ( ($parts & Securimage::HTML_INPUT_LABEL) > 0 && $show_input) {
|
|
$html .= sprintf('<label for="%s">%s</label> ',
|
|
htmlspecialchars($input_id),
|
|
htmlspecialchars($input_text));
|
|
|
|
if (!empty($error_html)) {
|
|
$html .= $error_html;
|
|
}
|
|
}
|
|
|
|
if ( ($parts & Securimage::HTML_INPUT) > 0 && $show_input) {
|
|
$input_attr = '';
|
|
if (!is_array($input_attrs)) $input_attrs = array();
|
|
$input_attrs['type'] = 'text';
|
|
$input_attrs['name'] = $input_name;
|
|
$input_attrs['id'] = $input_id;
|
|
$input_attrs['autocomplete'] = 'off';
|
|
|
|
foreach($input_attrs as $name => $val) {
|
|
$input_attr .= sprintf('%s="%s" ', $name, htmlspecialchars($val));
|
|
}
|
|
|
|
$html .= sprintf('<input %s>', $input_attr);
|
|
}
|
|
|
|
return $html;
|
|
}
|
|
|
|
/**
|
|
* Get the time in seconds that it took to solve the captcha.
|
|
*
|
|
* @return int The time in seconds from when the code was created, to when it was solved
|
|
*/
|
|
public function getTimeToSolve()
|
|
{
|
|
return $this->_timeToSolve;
|
|
}
|
|
|
|
/**
|
|
* Set the namespace for the captcha being stored in the session or database.
|
|
*
|
|
* Namespaces are useful when multiple captchas need to be displayed on a single page.
|
|
*
|
|
* @param string $namespace Namespace value, String consisting of characters "a-zA-Z0-9_-"
|
|
*/
|
|
public function setNamespace($namespace)
|
|
{
|
|
$namespace = preg_replace('/[^a-z0-9-_]/i', '', $namespace);
|
|
$namespace = substr($namespace, 0, 64);
|
|
|
|
if (!empty($namespace)) {
|
|
$this->namespace = $namespace;
|
|
} else {
|
|
$this->namespace = 'default';
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Generate an audible captcha in WAV format and send it to the browser with appropriate headers.
|
|
* Example:
|
|
*
|
|
* $img = new Securimage();
|
|
* $img->outputAudioFile(); // outputs a wav file to the browser
|
|
* exit;
|
|
*
|
|
* @param string $format
|
|
*/
|
|
public function outputAudioFile($format = null)
|
|
{
|
|
set_error_handler(array(&$this, 'errorHandler'));
|
|
|
|
if (isset($_SERVER['HTTP_RANGE'])) {
|
|
$range = true;
|
|
$rangeId = (isset($_SERVER['HTTP_X_PLAYBACK_SESSION_ID'])) ?
|
|
'ID' . $_SERVER['HTTP_X_PLAYBACK_SESSION_ID'] :
|
|
'ID' . md5($_SERVER['REQUEST_URI']);
|
|
$uniq = $rangeId;
|
|
} else {
|
|
$uniq = md5(uniqid(microtime()));
|
|
}
|
|
|
|
try {
|
|
if (!($audio = $this->getAudioData())) {
|
|
// if previously generated audio not found for current captcha
|
|
require_once dirname(__FILE__) . '/WavFile.php';
|
|
$audio = $this->getAudibleCode();
|
|
|
|
if (strtolower($format) == 'mp3') {
|
|
$audio = $this->wavToMp3($audio);
|
|
}
|
|
|
|
$this->saveAudioData($audio);
|
|
}
|
|
} catch (Exception $ex) {
|
|
$log_file = rtrim($this->log_path, '/\\ ') . DIRECTORY_SEPARATOR . $this->log_file;
|
|
|
|
if (($fp = fopen($log_file, 'a+')) !== false) {
|
|
fwrite($fp, date('Y-m-d H:i:s') . ': Securimage audio error "' . $ex->getMessage() . '"' . "\n");
|
|
fclose($fp);
|
|
}
|
|
|
|
$audio = $this->audioError();
|
|
}
|
|
|
|
if ($this->no_session != true) {
|
|
// close session to make it available to other requests in the event
|
|
// streaming the audio takes sevaral seconds or more
|
|
session_write_close();
|
|
}
|
|
|
|
if ($this->canSendHeaders() || $this->send_headers == false) {
|
|
if ($this->send_headers) {
|
|
if ($format == 'mp3') {
|
|
$ext = 'mp3';
|
|
$type = 'audio/mpeg';
|
|
} else {
|
|
$ext = 'wav';
|
|
$type = 'audio/wav';
|
|
}
|
|
|
|
header('Accept-Ranges: bytes');
|
|
header("Content-Disposition: attachment; filename=\"securimage_audio-{$uniq}.{$ext}\"");
|
|
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: ' . $type);
|
|
}
|
|
|
|
$this->rangeDownload($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;
|
|
}
|
|
|
|
/**
|
|
* Output audio data with http range support. Typically this shouldn't be
|
|
* called directly unless being used with a custom implentation. Use
|
|
* Securimage::outputAudioFile instead.
|
|
*
|
|
* @param string $audio Raw wav or mp3 audio file content
|
|
*/
|
|
public function rangeDownload($audio)
|
|
{
|
|
/* Congratulations Firefox Android/Linux/Windows for being the most
|
|
* sensible browser of all when streaming HTML5 audio!
|
|
*
|
|
* Chrome on Android and iOS on iPad/iPhone both make extra HTTP requests
|
|
* for the audio whether on WiFi or the mobile network resulting in
|
|
* multiple downloads of the audio file and wasted bandwidth.
|
|
*
|
|
* If I'm doing something wrong in this code or anyone knows why, I'd
|
|
* love to hear from you.
|
|
*/
|
|
$audioLength = $size = strlen($audio);
|
|
|
|
if (isset($_SERVER['HTTP_RANGE'])) {
|
|
list( , $range) = explode('=', $_SERVER['HTTP_RANGE']); // bytes=byte-range-set
|
|
$range = trim($range);
|
|
|
|
if (strpos($range, ',') !== false) {
|
|
// eventually, we should handle requests with multiple ranges
|
|
// most likely these types of requests will never be sent
|
|
header('HTTP/1.1 416 Range Not Satisfiable');
|
|
echo "<h1>Range Not Satisfiable</h1>";
|
|
exit;
|
|
} else if (preg_match('/(\d+)-(\d+)/', $range, $match)) {
|
|
// bytes n - m
|
|
$range = array(intval($match[1]), intval($match[2]));
|
|
} else if (preg_match('/(\d+)-$/', $range, $match)) {
|
|
// bytes n - last byte of file
|
|
$range = array(intval($match[1]), null);
|
|
} else if (preg_match('/-(\d+)/', $range, $match)) {
|
|
// final n bytes of file
|
|
$range = array($size - intval($match[1]), $size - 1);
|
|
}
|
|
|
|
if ($range[1] === null) $range[1] = $size - 1;
|
|
$length = $range[1] - $range[0] + 1;
|
|
$audio = substr($audio, $range[0], $length);
|
|
$audioLength = strlen($audio);
|
|
|
|
header('HTTP/1.1 206 Partial Content');
|
|
header("Content-Range: bytes {$range[0]}-{$range[1]}/{$size}");
|
|
|
|
if ($range[0] < 0 ||$range[1] >= $size || $range[0] >= $size || $range[0] > $range[1]) {
|
|
header('HTTP/1.1 416 Range Not Satisfiable');
|
|
echo "<h1>Range Not Satisfiable</h1>";
|
|
exit;
|
|
}
|
|
}
|
|
|
|
header('Content-Length: ' . $audioLength);
|
|
|
|
echo $audio;
|
|
}
|
|
|
|
/**
|
|
* Return the code from the session or database (if configured). If none exists or was found, an empty string is returned.
|
|
*
|
|
* @param bool $array true to receive an array containing the code and properties, false to receive just the code.
|
|
* @param bool $returnExisting If true, and the class property *code* is set, it will be returned instead of getting the code from the session or database.
|
|
* @return array|string Return is an array if $array = true, otherwise a string containing the code
|
|
*/
|
|
public function getCode($array = false, $returnExisting = false)
|
|
{
|
|
$code = array();
|
|
$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['code'] = $_SESSION['securimage_code_value'][$this->namespace];
|
|
$code['time'] = $_SESSION['securimage_code_ctime'][$this->namespace];
|
|
$code['display'] = $_SESSION['securimage_code_disp'] [$this->namespace];
|
|
}
|
|
}
|
|
}
|
|
|
|
if (empty($code) && $this->use_database) {
|
|
// no code in session - may mean user has cookies turned off
|
|
$this->openDatabase();
|
|
$code = $this->getCodeFromDatabase();
|
|
|
|
if (!empty($code)) {
|
|
$code['display'] = $code['code_disp'];
|
|
unset($code['code_disp']);
|
|
}
|
|
} else { /* no code stored in session or sqlite database, validation will fail */ }
|
|
|
|
if ($array == true) {
|
|
return $code;
|
|
} else {
|
|
return $code['code'];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The main image drawing routing, responsible for constructing the entire image and serving it
|
|
*/
|
|
protected function doImage()
|
|
{
|
|
if($this->use_transparent_text == true || $this->bgimg != '' || function_exists('imagecreatetruecolor')) {
|
|
$imagecreate = 'imagecreatetruecolor';
|
|
} else {
|
|
$imagecreate = 'imagecreate';
|
|
}
|
|
|
|
$this->im = $imagecreate($this->image_width, $this->image_height);
|
|
|
|
if (function_exists('imageantialias')) {
|
|
imageantialias($this->im, true);
|
|
}
|
|
|
|
$this->allocateColors();
|
|
|
|
if ($this->perturbation > 0) {
|
|
$this->tmpimg = $imagecreate($this->image_width * $this->iscale, $this->image_height * $this->iscale);
|
|
imagepalettecopy($this->tmpimg, $this->im);
|
|
} else {
|
|
$this->iscale = 1;
|
|
}
|
|
|
|
$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 = $this->code;
|
|
} elseif ($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,
|
|
$this->gdbgcolor);
|
|
|
|
if ($this->perturbation > 0) {
|
|
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
|
|
* @return string|bool
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* This method generates a new captcha code.
|
|
*
|
|
* Generates a random captcha code based on *charset*, math problem, or captcha from the wordlist and saves the value to the session and/or database.
|
|
*/
|
|
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()
|
|
{
|
|
$ratio = ($this->font_ratio) ? $this->font_ratio : 0.4;
|
|
|
|
if ((float)$ratio < 0.1 || (float)$ratio >= 1) {
|
|
$ratio = 0.4;
|
|
}
|
|
|
|
if (!is_readable($this->ttfFile())) {
|
|
// this will not catch missing fonts after the first!
|
|
$this->perturbation = 0;
|
|
imagestring($this->im, 4, 10, ($this->image_height / 2) - 5, 'Failed to load TTF font file!', $this->gdtextcolor);
|
|
|
|
return ;
|
|
}
|
|
|
|
if ($this->perturbation > 0) {
|
|
$width = $this->image_width * $this->iscale;
|
|
$height = $this->image_height * $this->iscale;
|
|
$font_size = $height * $ratio;
|
|
$im = &$this->tmpimg;
|
|
$scale = $this->iscale;
|
|
} else {
|
|
$height = $this->image_height;
|
|
$width = $this->image_width;
|
|
$font_size = $this->image_height * $ratio;
|
|
$im = &$this->im;
|
|
$scale = 1;
|
|
}
|
|
|
|
$captcha_text = $this->code_display;
|
|
|
|
if ($this->use_random_spaces && $this->strpos($captcha_text, ' ') === false) {
|
|
if (mt_rand(1, 100) % 5 > 0) { // ~20% chance no spacing added
|
|
$index = mt_rand(1, $this->strlen($captcha_text) -1);
|
|
$spaces = mt_rand(1, 3);
|
|
|
|
// in general, we want all characters drawn close together to
|
|
// prevent easy segmentation by solvers, but this adds random
|
|
// spacing between two groups to make character positioning
|
|
// less normalized.
|
|
|
|
$captcha_text = sprintf(
|
|
'%s%s%s',
|
|
$this->substr($captcha_text, 0, $index),
|
|
str_repeat(' ', $spaces),
|
|
$this->substr($captcha_text, $index)
|
|
);
|
|
}
|
|
}
|
|
|
|
$fonts = array(); // list of fonts corresponding to each char $i
|
|
$angles = array(); // angles corresponding to each char $i
|
|
$distance = array(); // distance from current char $i to previous char
|
|
$dims = array(); // dimensions of each individual char $i
|
|
$txtWid = 0; // width of the entire text string, including spaces and distances
|
|
|
|
// Character positioning and angle
|
|
|
|
$angle0 = mt_rand(10, 20);
|
|
$angleN = mt_rand(-20, 10);
|
|
|
|
if ($this->use_text_angles == false) {
|
|
$angle0 = $angleN = $step = 0;
|
|
}
|
|
|
|
if (mt_rand(0, 99) % 2 == 0) {
|
|
$angle0 = -$angle0;
|
|
}
|
|
if (mt_rand(0, 99) % 2 == 1) {
|
|
$angleN = -$angleN;
|
|
}
|
|
|
|
$step = abs($angle0 - $angleN) / ($this->strlen($captcha_text) - 1);
|
|
$step = ($angle0 > $angleN) ? -$step : $step;
|
|
$angle = $angle0;
|
|
|
|
for ($c = 0; $c < $this->strlen($captcha_text); ++$c) {
|
|
$font = $this->ttfFile(); // select random font from list for this character
|
|
$fonts[] = $font;
|
|
$angles[] = $angle; // the angle of this character
|
|
$dist = mt_rand(-2, 0) * $scale; // random distance between this and next character
|
|
$distance[] = $dist;
|
|
$char = $this->substr($captcha_text, $c, 1); // the character to draw for this sequence
|
|
|
|
$dim = $this->getCharacterDimensions($char, $font_size, $angle, $font); // calculate dimensions of this character
|
|
|
|
$dim[0] += $dist; // add the distance to the dimension (negative to bring them closer)
|
|
$txtWid += $dim[0]; // increment width based on character width
|
|
|
|
$dims[] = $dim;
|
|
|
|
$angle += $step; // next angle
|
|
|
|
if ($angle > 20) {
|
|
$angle = 20;
|
|
$step = $step * -1;
|
|
} elseif ($angle < -20) {
|
|
$angle = -20;
|
|
$step = -1 * $step;
|
|
}
|
|
}
|
|
|
|
$nextYPos = function($y, $i, $step) use ($height, $scale, $dims) {
|
|
static $dir = 1;
|
|
|
|
if ($y + $step + $dims[$i][2] + (10 * $scale) > $height) {
|
|
$dir = 0;
|
|
} elseif ($y - $step - $dims[$i][2] < $dims[$i][1] + $dims[$i][2] + (5 * $scale)) {
|
|
$dir = 1;
|
|
}
|
|
|
|
if ($dir) {
|
|
$y += $step;
|
|
} else {
|
|
$y -= $step;
|
|
}
|
|
|
|
return $y;
|
|
};
|
|
|
|
$cx = floor($width / 2 - ($txtWid / 2));
|
|
$x = mt_rand(5 * $scale, max($cx * 2 - (5 * $scale), 5 * $scale));
|
|
|
|
if ($this->use_random_baseline) {
|
|
$y = mt_rand($dims[0][1], $height - 10);
|
|
} else {
|
|
$y = ($height / 2 + $dims[0][1] / 2 - $dims[0][2]);
|
|
}
|
|
|
|
$st = $scale * mt_rand(5, 10);
|
|
|
|
for ($c = 0; $c < $this->strlen($captcha_text); ++$c) {
|
|
$font = $fonts[$c];
|
|
$char = $this->substr($captcha_text, $c, 1);
|
|
$angle = $angles[$c];
|
|
$dim = $dims[$c];
|
|
|
|
if ($this->use_random_baseline) {
|
|
$y = $nextYPos($y, $c, $st);
|
|
}
|
|
|
|
imagettftext(
|
|
$im,
|
|
$font_size,
|
|
$angle,
|
|
(int)$x,
|
|
(int)$y,
|
|
$this->gdtextcolor,
|
|
$font,
|
|
$char
|
|
);
|
|
|
|
if ($this->use_random_boxes && strlen(trim($char)) && mt_rand(1,100) % 5 == 0) {
|
|
imagesetthickness($im, 3);
|
|
imagerectangle($im, $x, $y - $dim[1] + $dim[2], $x + $dim[0], $y + $dim[2], $this->gdtextcolor);
|
|
}
|
|
|
|
if ($c == ' ') {
|
|
$x += $dim[0];
|
|
} else {
|
|
$x += $dim[0] + $distance[$c];
|
|
}
|
|
}
|
|
|
|
// DEBUG
|
|
//$this->im = $im;
|
|
//$this->output();
|
|
}
|
|
|
|
/**
|
|
* Get the width and height (in points) of a character for a given font,
|
|
* angle, and size.
|
|
*
|
|
* @param string $char The character to get dimensions for
|
|
* @param number $size The font size, in points
|
|
* @param number $angle The angle of the text
|
|
* @return number[] A 3-element array representing the width, height and baseline of the text
|
|
*/
|
|
protected function getCharacterDimensions($char, $size, $angle, $font)
|
|
{
|
|
$box = imagettfbbox($size, $angle, $font, $char);
|
|
|
|
return array($box[2] - $box[0], max($box[1] - $box[7], $box[5] - $box[3]), $box[1]);
|
|
}
|
|
|
|
/**
|
|
* Copies the captcha image to the final image with distortion applied
|
|
*/
|
|
protected function distortedCopy()
|
|
{
|
|
$numpoles = 3; // distortion factor
|
|
$px = array(); // x coordinates of poles
|
|
$py = array(); // y coordinates of poles
|
|
$rad = array(); // radius of distortion from pole
|
|
$amp = array(); // amplitude
|
|
$x = ($this->image_width / 4); // lowest x coordinate of a pole
|
|
$maxX = $this->image_width - $x; // maximum x coordinate of a pole
|
|
$dx = mt_rand($x / 10, $x); // horizontal distance between poles
|
|
$y = mt_rand(20, $this->image_height - 20); // random y coord
|
|
$dy = mt_rand(20, $this->image_height * 0.7); // y distance
|
|
$minY = 20; // minimum y coordinate
|
|
$maxY = $this->image_height - 20; // maximum y cooddinate
|
|
|
|
// make array of poles AKA attractor points
|
|
for ($i = 0; $i < $numpoles; ++ $i) {
|
|
$px[$i] = ($x + ($dx * $i)) % $maxX;
|
|
$py[$i] = ($y + ($dy * $i)) % $maxY + $minY;
|
|
$rad[$i] = mt_rand($this->image_height * 0.4, $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 * 0.33;
|
|
$w = $this->image_width;
|
|
$len = mt_rand($w * 0.4, $w * 0.7);
|
|
$lwid = mt_rand(0, 4);
|
|
|
|
$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);
|
|
$noise_level *= M_LOG2E;
|
|
|
|
for ($x = 1; $x < $this->image_width; $x += 20) {
|
|
for ($y = 1; $y < $this->image_height; $y += 20) {
|
|
for ($i = 0; $i < $noise_level; ++$i) {
|
|
$x1 = mt_rand($x, $x + 20);
|
|
$y1 = mt_rand($y, $y + 20);
|
|
$size = mt_rand(1, 3);
|
|
|
|
if ($x1 - $size <= 0 && $y1 - $size <= 0) continue; // dont cover 0,0 since it is used by imagedistortedcopy
|
|
imagefilledarc($this->im, $x1, $y1, $size, $size, 0, mt_rand(180,360), $this->gdlinecolor, IMG_ARC_PIE);
|
|
}
|
|
}
|
|
}
|
|
|
|
$t = microtime(true) - $t0;
|
|
|
|
/*
|
|
// DEBUG
|
|
imagestring($this->im, 5, 25, 30, "$t", $this->gdnoisecolor);
|
|
header('content-type: image/png');
|
|
imagepng($this->im);
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* Generates an audio captcha in WAV format
|
|
*
|
|
* @return string The audio representation of the captcha in Wav format
|
|
*/
|
|
protected function getAudibleCode()
|
|
{
|
|
$letters = array();
|
|
$code = $this->getCode(true, true);
|
|
|
|
if (empty($code) || empty($code['code'])) {
|
|
if (strlen($this->display_value) > 0) {
|
|
$code = array('code' => $this->display_value, 'display' => $this->display_value);
|
|
} else {
|
|
$this->createCode();
|
|
$code = $this->getCode(true);
|
|
}
|
|
}
|
|
|
|
if (empty($code)) {
|
|
$error = 'Failed to get audible code (are database settings correct?). Check the error log for details';
|
|
trigger_error($error, E_USER_WARNING);
|
|
throw new \Exception($error);
|
|
}
|
|
|
|
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 = $this->strlen($code['display']);
|
|
|
|
for($i = 0; $i < $length; ++$i) {
|
|
$letter = $this->substr($code['display'], $i, 1);
|
|
$letters[] = $letter;
|
|
}
|
|
}
|
|
|
|
try {
|
|
return $this->generateWAV($letters);
|
|
} catch(\Exception $ex) {
|
|
throw $ex;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets a captcha code from a file containing a list of words.
|
|
*
|
|
* Seek to a random offset in the file and reads a block of data and returns a line from the file.
|
|
*
|
|
* @param int $numWords Number of words (lines) to read from the file
|
|
* @return string|array|bool Returns a string if only one word is to be read, or an array of words
|
|
*/
|
|
protected function readCodeFromFile($numWords = 1)
|
|
{
|
|
$strtolower_func = 'strtolower';
|
|
$mb_support = false;
|
|
|
|
if (!empty($this->wordlist_file_encoding)) {
|
|
if (!extension_loaded('mbstring')) {
|
|
trigger_error("wordlist_file_encoding option set, but PHP does not have mbstring support", E_USER_WARNING);
|
|
return false;
|
|
}
|
|
|
|
// emits PHP warning if not supported
|
|
$mb_support = mb_internal_encoding($this->wordlist_file_encoding);
|
|
|
|
if (!$mb_support) {
|
|
return false;
|
|
}
|
|
|
|
$strtolower_func = 'mb_strtolower';
|
|
}
|
|
|
|
$fp = fopen($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 - 128), SEEK_SET); // seek to a random position of file from 0 to filesize-128
|
|
$data = fread($fp, 128); // read a chunk from our random position
|
|
|
|
if ($mb_support !== false) {
|
|
$data = mb_ereg_replace("\r?\n", "\n", $data);
|
|
} else {
|
|
$data = preg_replace("/\r?\n/", "\n", $data);
|
|
}
|
|
|
|
$start = @$this->strpos($data, "\n", mt_rand(0, 56)) + 1; // random start position
|
|
$end = @$this->strpos($data, "\n", $start); // find end of word
|
|
|
|
if ($start === false) {
|
|
// picked start position at end of file
|
|
continue;
|
|
} else if ($end === false) {
|
|
$end = $this->strlen($data);
|
|
}
|
|
|
|
$word = $strtolower_func($this->substr($data, $start, $end - $start)); // return a line of the file
|
|
|
|
if ($mb_support) {
|
|
// convert to UTF-8 for imagettftext
|
|
$word = mb_convert_encoding($word, 'UTF-8', $this->wordlist_file_encoding);
|
|
}
|
|
|
|
$words[] = $word;
|
|
} while (++$i < $numWords);
|
|
|
|
fclose($fp);
|
|
|
|
if ($numWords < 2) {
|
|
return $words[0];
|
|
} else {
|
|
return $words;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Generates a random captcha code from the set character set
|
|
*
|
|
* @see Securimage::$charset Charset option
|
|
* @return string A randomly generated CAPTCHA code
|
|
*/
|
|
protected function generateCode()
|
|
{
|
|
$code = '';
|
|
|
|
for($i = 1, $cslen = $this->strlen($this->charset); $i <= $this->code_length; ++$i) {
|
|
$code .= $this->substr($this->charset, mt_rand(0, $cslen - 1), 1);
|
|
}
|
|
|
|
return $code;
|
|
}
|
|
|
|
/**
|
|
* Validate a code supplied by the user
|
|
*
|
|
* Checks the entered code against the value stored in the session and/or database (if configured). Handles case sensitivity.
|
|
* Also removes the code from session/database if the code was entered correctly to prevent re-use attack.
|
|
*
|
|
* This function does not return a value.
|
|
*
|
|
* @see Securimage::$correct_code 'correct_code' property
|
|
*/
|
|
protected function validate()
|
|
{
|
|
if (!is_string($this->code) || strlen($this->code) == 0) {
|
|
$code = $this->getCode(true);
|
|
// returns stored code, or an empty string if no stored code was found
|
|
// checks the session and database if enabled
|
|
} else {
|
|
$code = $this->code;
|
|
}
|
|
|
|
if (is_array($code)) {
|
|
if (!empty($code)) {
|
|
$ctime = $code['time'];
|
|
$code = $code['code'];
|
|
|
|
$this->_timeToSolve = time() - $ctime;
|
|
} else {
|
|
$code = '';
|
|
}
|
|
}
|
|
|
|
if ($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 ((string)$code === (string)$code_entered) {
|
|
$this->correct_code = true;
|
|
if ($this->no_session != true) {
|
|
$_SESSION['securimage_code_disp'] [$this->namespace] = '';
|
|
$_SESSION['securimage_code_value'][$this->namespace] = '';
|
|
$_SESSION['securimage_code_ctime'][$this->namespace] = '';
|
|
$_SESSION['securimage_code_audio'][$this->namespace] = '';
|
|
}
|
|
$this->clearCodeFromDatabase();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Save CAPTCHA data to session and database (if configured)
|
|
*/
|
|
protected function saveData()
|
|
{
|
|
if ($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();
|
|
$_SESSION['securimage_code_audio'][$this->namespace] = null; // clear previous audio, if set
|
|
}
|
|
|
|
if ($this->use_database) {
|
|
$this->saveCodeToDatabase();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Save audio data to session and/or the configured database
|
|
*
|
|
* @param string $data The CAPTCHA audio data
|
|
*/
|
|
protected function saveAudioData($data)
|
|
{
|
|
if ($this->no_session != true) {
|
|
$_SESSION['securimage_code_audio'][$this->namespace] = $data;
|
|
}
|
|
|
|
if ($this->use_database) {
|
|
$this->saveAudioToDatabase($data);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets audio file contents from the session or database
|
|
*
|
|
* @return string|boolean Audio contents on success, or false if no audio found in session or DB
|
|
*/
|
|
protected function getAudioData()
|
|
{
|
|
if ($this->no_session != true) {
|
|
if (isset($_SESSION['securimage_code_audio'][$this->namespace])) {
|
|
return $_SESSION['securimage_code_audio'][$this->namespace];
|
|
}
|
|
}
|
|
|
|
if ($this->use_database) {
|
|
$this->openDatabase();
|
|
$code = $this->getCodeFromDatabase();
|
|
|
|
if (!empty($code['audio_data'])) {
|
|
return $code['audio_data'];
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Saves the CAPTCHA data to the configured 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)
|
|
// Clears previous captcha for this client from database so we can do a straight insert
|
|
// without having to do INSERT ... ON DUPLICATE KEY or a find/update
|
|
$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();
|
|
$error = "Failed to insert code into database. {$err[1]}: {$err[2]}.";
|
|
|
|
if ($this->database_driver == self::SI_DRIVER_SQLITE3) {
|
|
$err14 = ($err[1] == 14);
|
|
if ($err14) $error .= sprintf(" Ensure database directory and file are writeable by user '%s' (%d).",
|
|
get_current_user(), getmyuid());
|
|
}
|
|
|
|
trigger_error($error, E_USER_WARNING);
|
|
}
|
|
}
|
|
|
|
return $success !== false;
|
|
}
|
|
|
|
/**
|
|
* Saves CAPTCHA audio to the configured database
|
|
*
|
|
* @param string $data Audio data
|
|
* @return boolean true on success, false on failure
|
|
*/
|
|
protected function saveAudioToDatabase($data)
|
|
{
|
|
$success = false;
|
|
$this->openDatabase();
|
|
|
|
if ($this->use_database && $this->pdo_conn) {
|
|
$id = $this->getCaptchaId(false);
|
|
$ip = $_SERVER['REMOTE_ADDR'];
|
|
$ns = $this->namespace;
|
|
|
|
if (empty($id)) {
|
|
$id = $ip;
|
|
}
|
|
|
|
$query = "UPDATE {$this->database_table} SET audio_data = :audioData WHERE id = :id AND namespace = :namespace";
|
|
$stmt = $this->pdo_conn->prepare($query);
|
|
$stmt->bindParam(':audioData', $data, PDO::PARAM_LOB);
|
|
$stmt->bindParam(':id', $id);
|
|
$stmt->bindParam(':namespace', $ns);
|
|
$success = $stmt->execute();
|
|
}
|
|
|
|
return $success !== false;
|
|
}
|
|
|
|
/**
|
|
* Opens a connection to the configured database.
|
|
*
|
|
* @see Securimage::$use_database Use database
|
|
* @see Securimage::$database_driver Database driver
|
|
* @see Securimage::$pdo_conn pdo_conn
|
|
* @return bool true if the database connection was successful, false if not
|
|
*/
|
|
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;
|
|
}
|
|
}
|
|
|
|
try {
|
|
$dsn = $this->getDsn();
|
|
|
|
$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;
|
|
} catch (Exception $ex) {
|
|
trigger_error($ex->getMessage(), E_USER_WARNING);
|
|
return false;
|
|
}
|
|
|
|
try {
|
|
if (!$this->skip_table_check && !$this->checkTablesExist()) {
|
|
// create tables...
|
|
$this->createDatabaseTables();
|
|
}
|
|
} catch (Exception $ex) {
|
|
trigger_error($ex->getMessage(), E_USER_WARNING);
|
|
$this->pdo_conn = false;
|
|
return false;
|
|
}
|
|
|
|
if (mt_rand(0, 100) / 100.0 == 1.0) {
|
|
$this->purgeOldCodesFromDatabase();
|
|
}
|
|
|
|
return $this->pdo_conn;
|
|
}
|
|
|
|
/**
|
|
* Get the PDO DSN string for connecting to the database
|
|
*
|
|
* @see Securimage::$database_driver Database driver
|
|
* @throws Exception If database specific options are not configured
|
|
* @return string The DSN for connecting to the database
|
|
*/
|
|
protected function getDsn()
|
|
{
|
|
$dsn = sprintf('%s:', $this->database_driver);
|
|
|
|
switch($this->database_driver) {
|
|
case self::SI_DRIVER_SQLITE3:
|
|
$dsn .= $this->database_file;
|
|
break;
|
|
|
|
case self::SI_DRIVER_MYSQL:
|
|
case self::SI_DRIVER_PGSQL:
|
|
if (empty($this->database_host)) {
|
|
throw new Exception('Securimage::database_host is not set');
|
|
} else if (empty($this->database_name)) {
|
|
throw new Exception('Securimage::database_name is not set');
|
|
}
|
|
|
|
$dsn .= sprintf('host=%s;dbname=%s',
|
|
$this->database_host,
|
|
$this->database_name);
|
|
break;
|
|
|
|
}
|
|
|
|
return $dsn;
|
|
}
|
|
|
|
/**
|
|
* Checks if the necessary database tables for storing captcha codes exist
|
|
*
|
|
* @throws Exception If the table check failed for some reason
|
|
* @return boolean true if the database do exist, false if not
|
|
*/
|
|
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 ($result->rowCount() == 0) {
|
|
return false;
|
|
} else {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Create the necessary databaes table for storing captcha codes.
|
|
*
|
|
* Based on the database adapter used, the tables will created in the existing connection.
|
|
*
|
|
* @see Securimage::$database_driver Database driver
|
|
* @return boolean true if the tables were created, false if not
|
|
*/
|
|
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,
|
|
audio_data BLOB 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,
|
|
`audio_data` MEDIUMBLOB 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,
|
|
audio_data bytea 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;
|
|
}
|
|
|
|
/**
|
|
* Retrieves a stored code from the database for based on the captchaId or
|
|
* IP address if captcha ID not used.
|
|
*
|
|
* @return string|array Empty string if no code was found or has expired,
|
|
* otherwise returns array of code information.
|
|
*/
|
|
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 ($this->database_driver == self::SI_DRIVER_PGSQL && is_resource($row['audio_data'])) {
|
|
// pg bytea data returned as stream resource
|
|
$data = '';
|
|
while (!feof($row['audio_data'])) {
|
|
$data .= fgets($row['audio_data']);
|
|
}
|
|
$row['audio_data'] = $data;
|
|
}
|
|
$code = array(
|
|
'code' => $row['code'],
|
|
'code_disp' => $row['code_display'],
|
|
'time' => $row['created'],
|
|
'audio_data' => $row['audio_data'],
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return $code;
|
|
}
|
|
|
|
/**
|
|
* Remove a stored code from the database based on captchaId or IP address.
|
|
*/
|
|
protected function clearCodeFromDatabase()
|
|
{
|
|
if ($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 (!$result) {
|
|
trigger_error("Failed to delete code from database.", E_USER_WARNING);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Deletes old (expired) codes from the database
|
|
*/
|
|
protected function purgeOldCodesFromDatabase()
|
|
{
|
|
if ($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,
|
|
$now,
|
|
$this->pdo_conn->quote("$limit", PDO::PARAM_INT));
|
|
|
|
$result = $this->pdo_conn->query($query);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Checks to see if the captcha code has expired and can no longer be used.
|
|
*
|
|
* @see Securimage::$expiry_time expiry_time
|
|
* @param int $creation_time The Unix timestamp of when the captcha code was created
|
|
* @return bool true if the code is expired, false if it is still valid
|
|
*/
|
|
protected function isCodeExpired($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
|
|
*
|
|
* @param array $letters The letters making up the captcha
|
|
* @return string The audio content in WAV format
|
|
*/
|
|
protected function generateWAV($letters)
|
|
{
|
|
$wavCaptcha = new WavFile();
|
|
$first = true; // reading first wav file
|
|
|
|
if ($this->audio_use_sox && !is_executable($this->sox_binary_path)) {
|
|
throw new Exception("Path to SoX binary is incorrect or not executable");
|
|
}
|
|
|
|
foreach ($letters as $letter) {
|
|
$letter = strtoupper($letter);
|
|
|
|
try {
|
|
$letter_file = realpath($this->audio_path) . DIRECTORY_SEPARATOR . $letter . '.wav';
|
|
|
|
if ($this->audio_use_sox) {
|
|
$sox_cmd = sprintf("%s %s -t wav - %s",
|
|
$this->sox_binary_path,
|
|
$letter_file,
|
|
$this->getSoxEffectChain());
|
|
|
|
$data = `$sox_cmd`;
|
|
|
|
$l = new WavFile();
|
|
$l->setIgnoreChunkSizes(true);
|
|
$l->setWavData($data);
|
|
} else {
|
|
$l = new WavFile($letter_file);
|
|
}
|
|
|
|
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 $ex) {
|
|
// failed to open file, or the wav file is broken or not supported
|
|
// 2 wav files were not compatible, different # channels, bits/sample, or sample rate
|
|
throw new Exception("Error generating audio captcha on letter '$letter': " . $ex->getMessage());
|
|
}
|
|
}
|
|
|
|
/********* Set up audio filters *****************************/
|
|
$filters = array();
|
|
|
|
if ($this->audio_use_noise == true) {
|
|
// use background audio - find random file
|
|
$wavNoise = false;
|
|
$randOffset = 0;
|
|
|
|
/*
|
|
// uncomment to try experimental SoX noise generation.
|
|
// warning: sounds may be considered annoying
|
|
if ($this->audio_use_sox) {
|
|
$duration = $wavCaptcha->getDataSize() / ($wavCaptcha->getBitsPerSample() / 8) /
|
|
$wavCaptcha->getNumChannels() / $wavCaptcha->getSampleRate();
|
|
$duration = round($duration, 2);
|
|
$wavNoise = new WavFile();
|
|
$wavNoise->setIgnoreChunkSizes(true);
|
|
$noiseData = $this->getSoxNoiseData($duration,
|
|
$wavCaptcha->getNumChannels(),
|
|
$wavCaptcha->getSampleRate(),
|
|
$wavCaptcha->getBitsPerSample());
|
|
$wavNoise->setWavData($noiseData, true);
|
|
|
|
} else
|
|
*/
|
|
if ( ($noiseFile = $this->getRandomNoiseFile()) !== false) {
|
|
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, $wavNoise->getNumBlocks() - 1);
|
|
}
|
|
}
|
|
|
|
if ($wavNoise !== false) {
|
|
$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();
|
|
}
|
|
|
|
/**
|
|
* Gets and returns the path to a random noise file from the audio noise directory.
|
|
*
|
|
* @return bool|string false if a file could not be found, or a string containing the path to the file.
|
|
*/
|
|
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 . $file;
|
|
|
|
if (!is_readable($return)) $return = false;
|
|
}
|
|
}
|
|
|
|
return $return;
|
|
}
|
|
|
|
/**
|
|
* Get a random effect or chain of effects to apply to a segment of the
|
|
* audio file.
|
|
*
|
|
* These effects should increase the randomness of the audio for
|
|
* a particular letter/number by modulating the signal. The SoX effects
|
|
* used are *bend*, *chorus*, *overdrive*, *pitch*, *reverb*, *tempo*, and
|
|
* *tremolo*.
|
|
*
|
|
* For each effect selected, random parameters are supplied to the effect.
|
|
*
|
|
* @param int $numEffects How many effects to chain together
|
|
* @return string A string of valid SoX effects and their respective options.
|
|
*/
|
|
protected function getSoxEffectChain($numEffects = 2)
|
|
{
|
|
$effectsList = array('bend', 'chorus', 'overdrive', 'pitch', 'reverb', 'tempo', 'tremolo');
|
|
$effects = array_rand($effectsList, $numEffects);
|
|
$outEffects = array();
|
|
|
|
if (!is_array($effects)) $effects = array($effects);
|
|
|
|
foreach($effects as $effect) {
|
|
$effect = $effectsList[$effect];
|
|
|
|
switch($effect)
|
|
{
|
|
case 'bend':
|
|
$delay = mt_rand(0, 15) / 100.0;
|
|
$cents = mt_rand(-120, 120);
|
|
$dur = mt_rand(75, 400) / 100.0;
|
|
$outEffects[] = "$effect $delay,$cents,$dur";
|
|
break;
|
|
|
|
case 'chorus':
|
|
$gainIn = mt_rand(75, 90) / 100.0;
|
|
$gainOut = mt_rand(70, 95) / 100.0;
|
|
$chorStr = "$effect $gainIn $gainOut";
|
|
|
|
for ($i = 0; $i < mt_rand(2, 3); ++$i) {
|
|
$delay = mt_rand(20, 100);
|
|
$decay = mt_rand(10, 100) / 100.0;
|
|
$speed = mt_rand(20, 50) / 100.0;
|
|
$depth = mt_rand(150, 250) / 100.0;
|
|
|
|
$chorStr .= " $delay $decay $speed $depth -s";
|
|
}
|
|
|
|
$outEffects[] = $chorStr;
|
|
break;
|
|
|
|
case 'overdrive':
|
|
$gain = mt_rand(5, 25);
|
|
$color = mt_rand(20, 70);
|
|
$outEffects[] = "$effect $gain $color";
|
|
break;
|
|
|
|
case 'pitch':
|
|
$cents = mt_rand(-300, 300);
|
|
$outEffects[] = "$effect $cents";
|
|
break;
|
|
|
|
case 'reverb':
|
|
$reverberance = mt_rand(20, 80);
|
|
$damping = mt_rand(10, 80);
|
|
$scale = mt_rand(85, 100);
|
|
$depth = mt_rand(90, 100);
|
|
$predelay = mt_rand(0, 5);
|
|
$outEffects[] = "$effect $reverberance $damping $scale $depth $predelay";
|
|
break;
|
|
|
|
case 'tempo':
|
|
$factor = mt_rand(65, 135) / 100.0;
|
|
$outEffects[] = "$effect -s $factor";
|
|
break;
|
|
|
|
case 'tremolo':
|
|
$hz = mt_rand(10, 30);
|
|
$depth = mt_rand(40, 85);
|
|
$outEffects[] = "$effect $hz $depth";
|
|
break;
|
|
}
|
|
}
|
|
|
|
return implode(' ', $outEffects);
|
|
}
|
|
|
|
/**
|
|
* This function is not yet used.
|
|
*
|
|
* Generate random background noise from sweeping oscillators
|
|
*
|
|
* @param float $duration How long in seconds the generated sound will be
|
|
* @param int $numChannels Number of channels in output wav
|
|
* @param int $sampleRate Sample rate of output wav
|
|
* @param int $bitRate Bits per sample (8, 16, 24)
|
|
* @return string Audio data in wav format
|
|
*/
|
|
protected function getSoxNoiseData($duration, $numChannels, $sampleRate, $bitRate)
|
|
{
|
|
$shapes = array('sine', 'square', 'triangle', 'sawtooth', 'trapezium');
|
|
$steps = array(':', '+', '/', '-');
|
|
$selShapes = array_rand($shapes, 2);
|
|
$selSteps = array_rand($steps, 2);
|
|
$sweep0 = array();
|
|
$sweep0[0] = mt_rand(100, 700);
|
|
$sweep0[1] = mt_rand(1500, 2500);
|
|
$sweep1 = array();
|
|
$sweep1[0] = mt_rand(500, 1000);
|
|
$sweep1[1] = mt_rand(1200, 2000);
|
|
|
|
if (mt_rand(0, 10) % 2 == 0)
|
|
$sweep0 = array_reverse($sweep0);
|
|
|
|
if (mt_rand(0, 10) % 2 == 0)
|
|
$sweep1 = array_reverse($sweep1);
|
|
|
|
$cmd = sprintf("%s -c %d -r %d -b %d -n -t wav - synth noise create vol 0.3 synth %.2f %s mix %d%s%d vol 0.3 synth %.2f %s fmod %d%s%d vol 0.3",
|
|
$this->sox_binary_path,
|
|
$numChannels,
|
|
$sampleRate,
|
|
$bitRate,
|
|
$duration,
|
|
$shapes[$selShapes[0]],
|
|
$sweep0[0],
|
|
$steps[$selSteps[0]],
|
|
$sweep0[1],
|
|
$duration,
|
|
$shapes[$selShapes[1]],
|
|
$sweep1[0],
|
|
$steps[$selSteps[1]],
|
|
$sweep1[1]
|
|
);
|
|
$data = `$cmd`;
|
|
|
|
return $data;
|
|
}
|
|
|
|
/**
|
|
* Convert WAV data to MP3 using the Lame MP3 encoder binary
|
|
*
|
|
* @param string $data Contents of the WAV file to convert
|
|
* @return string MP3 file data
|
|
*/
|
|
protected function wavToMp3($data)
|
|
{
|
|
if (!file_exists(self::$lame_binary_path) || !is_executable(self::$lame_binary_path)) {
|
|
throw new Exception('Lame binary "' . $this->lame_binary_path . '" does not exist or is not executable');
|
|
}
|
|
|
|
// size of wav data input
|
|
$size = strlen($data);
|
|
|
|
// file descriptors for reading and writing to the Lame process
|
|
$descriptors = array(
|
|
0 => array('pipe', 'r'), // stdin
|
|
1 => array('pipe', 'w'), // stdout
|
|
2 => array('pipe', 'a'), // stderr
|
|
);
|
|
|
|
if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
|
|
// workaround for Windows conversion
|
|
// writing to STDIN seems to hang indefinitely after writing approximately 0xC400 bytes
|
|
$wavinput = tempnam(sys_get_temp_dir(), 'wav');
|
|
if (!$wavinput) {
|
|
throw new Exception('Failed to create temporary file for WAV to MP3 conversion');
|
|
}
|
|
file_put_contents($wavinput, $data);
|
|
$size = 0;
|
|
} else {
|
|
$wavinput = '-'; // stdin
|
|
}
|
|
|
|
// Mono, variable bit rate, 32 kHz sampling rate, read WAV from stdin, write MP3 to stdout
|
|
$cmd = sprintf("%s -m m -v -b 32 %s -", self::$lame_binary_path, $wavinput);
|
|
$proc = proc_open($cmd, $descriptors, $pipes);
|
|
|
|
if (!is_resource($proc)) {
|
|
throw new Exception('Failed to open process for MP3 encoding');
|
|
}
|
|
|
|
stream_set_blocking($pipes[0], 0); // set stdin to be non-blocking
|
|
|
|
for ($written = 0; $written < $size; $written += $len) {
|
|
// write to stdin until all WAV data is written
|
|
$len = fwrite($pipes[0], substr($data, $written, 0x20000));
|
|
|
|
if ($len === 0) {
|
|
// fwrite wrote no data, make sure process is still alive, otherwise wait for it to process
|
|
$status = proc_get_status($proc);
|
|
if ($status['running'] === false) break;
|
|
usleep(25000);
|
|
} else if ($written < $size) {
|
|
// couldn't write all data, small pause and try again
|
|
usleep(10000);
|
|
} else if ($len === false) {
|
|
// fwrite failed, should not happen
|
|
break;
|
|
}
|
|
}
|
|
|
|
fclose($pipes[0]);
|
|
|
|
$data = stream_get_contents($pipes[1]);
|
|
$err = trim(stream_get_contents($pipes[2]));
|
|
|
|
fclose($pipes[1]);
|
|
fclose($pipes[2]);
|
|
|
|
$return = proc_close($proc);
|
|
|
|
if ($wavinput != '-') unlink($wavinput); // delete temp file on Windows
|
|
|
|
if ($return !== 0) {
|
|
throw new Exception("Failed to convert WAV to MP3. Shell returned ({$return}): {$err}");
|
|
} else if ($written < $size) {
|
|
throw new Exception('Failed to convert WAV to MP3. Failed to write all data to encoder');
|
|
}
|
|
|
|
return $data;
|
|
}
|
|
|
|
/**
|
|
* Return a wav file saying there was an error generating file
|
|
*
|
|
* @return string The binary audio contents
|
|
*/
|
|
protected function audioError()
|
|
{
|
|
return @file_get_contents(dirname(__FILE__) . '/audio/en/error.wav');
|
|
}
|
|
|
|
/**
|
|
* Checks to see if headers can be sent and if any error has been output
|
|
* to the browser
|
|
*
|
|
* @return bool true if it is safe to send headers, false if not
|
|
*/
|
|
protected function canSendHeaders()
|
|
{
|
|
if (headers_sent()) {
|
|
// output has been flushed and headers have already been sent
|
|
return false;
|
|
} else if (strlen((string)ob_get_contents()) > 0) {
|
|
// headers haven't been sent, but there is data in the buffer that will break image and audio data
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Return a random float between 0 and 0.9999
|
|
*
|
|
* @return float Random float between 0 and 0.9999
|
|
*/
|
|
protected function frand()
|
|
{
|
|
return 0.0001 * mt_rand(0,9999);
|
|
}
|
|
|
|
protected function strlen($string)
|
|
{
|
|
$strlen= 'strlen';
|
|
|
|
if (function_exists('mb_strlen')) {
|
|
$strlen= 'mb_strlen';
|
|
}
|
|
|
|
return $strlen($string);
|
|
}
|
|
|
|
protected function substr($string, $start, $length = null)
|
|
{
|
|
$substr= 'substr';
|
|
|
|
if (function_exists('mb_substr')) {
|
|
$substr = 'mb_substr';
|
|
}
|
|
|
|
if ($length === null) {
|
|
return $substr($string, $start);
|
|
} else {
|
|
return $substr($string, $start, $length);
|
|
}
|
|
}
|
|
|
|
protected function strpos($haystack, $needle, $offset = 0)
|
|
{
|
|
$strpos = 'strpos';
|
|
|
|
if (function_exists('mb_strpos')) {
|
|
$strpos = 'mb_strpos';
|
|
}
|
|
|
|
return $strpos($haystack, $needle, $offset);
|
|
}
|
|
|
|
/**
|
|
* Convert an html color code to a Securimage_Color
|
|
* @param string $color
|
|
* @param Securimage_Color|string $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);
|
|
}
|
|
}
|
|
|
|
protected function ttfFile()
|
|
{
|
|
if (is_string($this->ttf_file)) {
|
|
return $this->ttf_file;
|
|
} elseif (is_array($this->ttf_file)) {
|
|
return $this->ttf_file[mt_rand(0, sizeof($this->ttf_file)-1)];
|
|
} else {
|
|
throw new \Exception('ttf_file is not a string or array');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The error handling function 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 PHP error number
|
|
* @param string $errstr String description of the error
|
|
* @param string $errfile File error occurred in
|
|
* @param int $errline Line the error occurred on in file
|
|
* @param array $errcontext Additional context information
|
|
* @return boolean true if the error was handled, false if PHP should handle the error
|
|
*/
|
|
public function errorHandler($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
|
|
*
|
|
* @since 2.0
|
|
* @package Securimage
|
|
* @subpackage classes
|
|
*
|
|
*/
|
|
class Securimage_Color
|
|
{
|
|
/**
|
|
* Red value (0-255)
|
|
* @var int
|
|
*/
|
|
public $r;
|
|
|
|
/**
|
|
* Gree value (0-255)
|
|
* @var int
|
|
*/
|
|
public $g;
|
|
|
|
/**
|
|
* Blue value (0-255)
|
|
* @var int
|
|
*/
|
|
public $b;
|
|
|
|
/**
|
|
* Create a new Securimage_Color object.
|
|
*
|
|
* Constructor expects 1 or 3 arguments.
|
|
*
|
|
* When passing a single argument, specify the color using HTML hex format.
|
|
*
|
|
* When passing 3 arguments, specify each RGB component (from 0-255)
|
|
* individually.
|
|
*
|
|
* Examples:
|
|
*
|
|
* $color = new Securimage_Color('#0080FF');
|
|
* $color = new Securimage_Color(0, 128, 255);
|
|
*
|
|
* @param string $color The html color code to use
|
|
* @throws Exception If any color value is not valid
|
|
*/
|
|
public function __construct($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'
|
|
);
|
|
}
|
|
}
|
|
|
|
public function toLongColor()
|
|
{
|
|
return ($this->r << 16) + ($this->g << 8) + $this->b;
|
|
}
|
|
|
|
public function fromLongColor($color)
|
|
{
|
|
$this->r = ($color >> 16) & 0xff;
|
|
$this->g = ($color >> 8) & 0xff;
|
|
$this->b = $color & 0xff;
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
}
|
|
|
|
|