make_captcha_img.php

/make_captcha_img.php

https://github.com/fusenigk/mantisbt-1
PHP | 308 lines | 209 code | 27 blank | 72 comment | 45 complexity | fde82270304105ef7dbc0bb53f569454 MD5 | raw file

<?php
# MantisBT - A PHP based bugtracking system

# MantisBT is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# MantisBT is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with MantisBT.  If not, see <http://www.gnu.org/licenses/>.

/**
 * @package MantisBT
 * @author Marcello Scata' <marcelloscata at users.sourceforge.net> ITALY
 * @copyright Copyright (C) 2000 - 2002  Kenzaburo Ito - kenito@300baud.org
 * @copyright Copyright (C) 2002 - 2011  MantisBT Team - mantisbt-dev@lists.sourceforge.net
 * @link http://www.mantisbt.org
 *
 * @uses core.php
 * @uses config_api.php
 * @uses crypto_api.php
 * @uses gpc_api.php
 * @uses utility_api.php
 */

/**
 * MantisBT Core API's
 */
require_once( 'core.php' );
require_api( 'config_api.php' );
require_api( 'crypto_api.php' );
require_api( 'gpc_api.php' );
require_api( 'utility_api.php' );

$f_public_key = gpc_get_string( 'public_key' );

$t_private_key = substr( hash( 'whirlpool', 'captcha' . config_get_global( 'crypto_master_salt' ) . $f_public_key, false ), 0, 5 );
$t_system_font_folder = get_font_path();
$t_font_per_captcha = config_get( 'font_per_captcha' );

$t_captcha_init = array(
	'TTF_folder'     => $t_system_font_folder,
	'TTF_RANGE'      => array( $t_font_per_captcha )
);

$captcha = new masc_captcha( $t_captcha_init );
$captcha->make_captcha( $t_private_key );

#
# The class below was derived from
# http://www.phpclasses.org/browse/package/1163.html
#
# *** 3.0 Author
# Pascal Rehfeldt
# Pascal@Pascal-Rehfeldt.com
#
# http://www.phpclasses.org/browse.html/author/102754.html
#
#
# *** 3.1 License
# GNU General Public License (Version 2, June 1991)
#
# This program is free software; you can redistribute
# it and/or modify it under the terms of the GNU
# General Public License as published by the Free
# Software Foundation; either version 2 of the License,
# or (at your option) any later version.
#
# This program is distributed in the hope that it will
# be useful, but WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
class masc_captcha
{
	var $TTF_folder;
	var $TTF_RANGE  = array('ARIAL.TTF');
	var $chars		= 5;
	var $minsize	= 15;
	var $maxsize	= 15;
	var $maxrotation = 30;
	var $noise		= FALSE;
	var $websafecolors = TRUE;
	var $debug = FALSE;

	var $lx;				// width of picture
	var $ly;				// height of picture
	var $jpegquality = 80;	// image quality
	var $noisefactor = 9;	// this will multiplyed with number of chars
	var $nb_noise;			// number of background-noise-characters
	var $TTF_file;			// holds the current selected TrueTypeFont
	var $gd_version;		// holds the Version Number of GD-Library
	var $r;
	var $g;
	var $b;


		function masc_captcha( $config )
		{
			// Test for GD-Library(-Version)
			$this->gd_version = get_gd_version();
			if($this->gd_version == 0) die("There is no GD-Library-Support enabled. The Captcha-Class cannot be used!");
			if($this->debug) echo "\n<br />-Captcha-Debug: The available GD-Library has major version ".$this->gd_version;

			// extracts config array
			if(is_array($config))
			{
				if($this->debug) echo "\n<br />-Captcha-Debug: Extracts Config-Array in unsecure-mode!";
				foreach($config as $k=>$v) $this->$k = $v;
			}

			// check vars for maxtry, secretposition and min-max-size
			if($this->minsize > $this->maxsize)
			{
				$temp = $this->minsize;
				$this->minsize = $this->maxsize;
				$this->maxsize = $temp;
				if($this->debug) echo "<br />-Captcha-Debug: Arrghh! What do you think I mean with min and max? Switch minsize with maxsize.";
			}

			// check TrueTypeFonts
			if(is_array($this->TTF_RANGE))
			{
				if($this->debug) echo "\n<br />-Captcha-Debug: Check given TrueType-Array! (".count($this->TTF_RANGE).")";
				$temp = array();
				foreach($this->TTF_RANGE as $k=>$v)
				{
					if(is_readable($this->TTF_folder.$v)) $temp[] = $v;
				}
				$this->TTF_RANGE = $temp;
				if($this->debug) echo "\n<br />-Captcha-Debug: Valid TrueType-files: (".count($this->TTF_RANGE).")";
				//if(count($this->TTF_RANGE) < 1) die('No Truetypefont available for the CaptchaClass.');
			}
			else
			{
				if($this->debug) echo "\n<br />-Captcha-Debug: Check given TrueType-File! (".$this->TTF_RANGE.")";
				if(!is_readable($this->TTF_folder.$this->TTF_RANGE)) die('No Truetypefont available for the CaptchaClass.');
			}

			// select first TrueTypeFont
			$this->change_TTF();
			if($this->debug) echo "\n<br />-Captcha-Debug: Set current TrueType-File: (".$this->TTF_file.")";

			// get number of noise-chars for background if is enabled
			$this->nb_noise = $this->noise ? ($this->chars * $this->noisefactor) : 0;
			if($this->debug) echo "\n<br />-Captcha-Debug: Set number of noise characters to: (".$this->nb_noise.")";

			// set dimension of image
			$this->lx = ($this->chars + 1) * (int)(($this->maxsize + $this->minsize) / 1.5);
			$this->ly = (int)(2.4 * $this->maxsize);
			if($this->debug) echo "\n<br />-Captcha-Debug: Set image dimension to: (".$this->lx." x ".$this->ly.")";
		}

		function make_captcha( $private_key )
		{
			if($this->debug) echo "\n<br />-Captcha-Debug: Generate private key: ($private_key)";

			// create Image and set the apropriate function depending on GD-Version & websafecolor-value
			if($this->gd_version >= 2 && !$this->websafecolors)
			{
				$func1 = 'imagecreatetruecolor';
				$func2 = 'imagecolorallocate';
			}
			else
			{
				$func1 = 'imageCreate';
				$func2 = 'imagecolorclosest';
			}
			$image = $func1($this->lx,$this->ly);
			if($this->debug) echo "\n<br />-Captcha-Debug: Generate ImageStream with: ($func1())";
			if($this->debug) echo "\n<br />-Captcha-Debug: For colordefinitions we use: ($func2())";

			// Set Backgroundcolor
			$this->random_color(224, 255);
			$back =  @imagecolorallocate($image, $this->r, $this->g, $this->b);
			@ImageFilledRectangle($image,0,0,$this->lx,$this->ly,$back);
			if($this->debug) echo "\n<br />-Captcha-Debug: We allocate one color for Background: (".$this->r."-".$this->g."-".$this->b.")";

			// allocates the 216 websafe color palette to the image
			if($this->gd_version < 2 || $this->websafecolors) $this->makeWebsafeColors($image);

			// fill with noise or grid
			if($this->nb_noise > 0)
			{
				// random characters in background with random position, angle, color
				if($this->debug) echo "\n<br />-Captcha-Debug: Fill background with noise: (".$this->nb_noise.")";
				for($i=0; $i < $this->nb_noise; $i++)
				{
					srand((double)microtime()*1000000);
					$size	= intval(rand((int)($this->minsize / 2.3), (int)($this->maxsize / 1.7)));
					srand((double)microtime()*1000000);
					$angle	= intval(rand(0, 360));
					srand((double)microtime()*1000000);
					$x		= intval(rand(0, $this->lx));
					srand((double)microtime()*1000000);
					$y		= intval(rand(0, (int)($this->ly - ($size / 5))));
					$this->random_color(160, 224);
					$color	= $func2($image, $this->r, $this->g, $this->b);
					srand((double)microtime()*1000000);
					$text	= chr(intval(rand(45,250)));
					if(count ($this->TTF_RANGE)>0){
						@ImageTTFText($image, $size, $angle, $x, $y, $color, $this->change_TTF(), $text);
					} else {
						imagestring($image,5,$x,$y,$text,$color);
					}
				}
			}
			else
			{
				// generate grid
				if($this->debug) echo "\n<br />-Captcha-Debug: Fill background with x-gridlines: (".(int)($this->lx / (int)($this->minsize / 1.5)).")";
				for($i=0; $i < $this->lx; $i += (int)($this->minsize / 1.5))
				{
					$this->random_color(160, 224);
					$color	= $func2($image, $this->r, $this->g, $this->b);
					@imageline($image, $i, 0, $i, $this->ly, $color);
				}
				if($this->debug) echo "\n<br />-Captcha-Debug: Fill background with y-gridlines: (".(int)($this->ly / (int)(($this->minsize / 1.8))).")";
				for($i=0 ; $i < $this->ly; $i += (int)($this->minsize / 1.8))
				{
					$this->random_color(160, 224);
					$color	= $func2($image, $this->r, $this->g, $this->b);
					@imageline($image, 0, $i, $this->lx, $i, $color);
				}
			}

			// generate Text
			if($this->debug) echo "\n<br />-Captcha-Debug: Fill forground with chars and shadows: (".$this->chars.")";
			for($i=0, $x = intval(rand($this->minsize,$this->maxsize)); $i < $this->chars; $i++)
			{
				$text	= utf8_strtoupper(substr($private_key, $i, 1));
				srand((double)microtime()*1000000);
				$angle	= intval(rand(($this->maxrotation * -1), $this->maxrotation));
				srand((double)microtime()*1000000);
				$size	= intval(rand($this->minsize, $this->maxsize));
				srand((double)microtime()*1000000);
				$y		= intval(rand((int)($size * 1.5), (int)($this->ly - ($size / 7))));
				$this->random_color(0, 127);
				$color	=  $func2($image, $this->r, $this->g, $this->b);
				$this->random_color(0, 127);
				$shadow = $func2($image, $this->r + 127, $this->g + 127, $this->b + 127);
				if(count($this->TTF_RANGE) > 0){
					@ImageTTFText($image, $size, $angle, $x + (int)($size / 15), $y, $shadow, $this->change_TTF(), $text);
					@ImageTTFText($image, $size, $angle, $x, $y - (int)($size / 15), $color, $this->TTF_file, $text);
				} else {
					$t_font = rand(3,5);
					imagestring($image,$t_font,$x + (int)($size / 15),$y-20,$text,$color);
					imagestring($image,$t_font,$x,$y - (int)($size / 15)-20,$text,$color);
				}
				$x += (int)($size + ($this->minsize / 5));
			}
			header('Content-type: image/jpeg');
			@ImageJPEG($image, '', $this->jpegquality);
			@ImageDestroy($image);
			if($this->debug) echo "\n<br />-Captcha-Debug: Destroy Imagestream.";
		}

		/** @private **/
		function makeWebsafeColors(&$image)
		{
			for($r = 0; $r <= 255; $r += 51)
			{
				for($g = 0; $g <= 255; $g += 51)
				{
					for($b = 0; $b <= 255; $b += 51)
					{
						$color = imagecolorallocate($image, $r, $g, $b);
						//$a[$color] = array('r'=>$r,'g'=>$g,'b'=>$b);
					}
				}
			}
			if($this->debug) echo "\n<br />-Captcha-Debug: Allocate 216 websafe colors to image: (".imagecolorstotal($image).")";
		}

		function random_color($min,$max)
		{
			srand((double)microtime() * 1000000);
			$this->r = intval(rand($min,$max));
			srand((double)microtime() * 1000000);
			$this->g = intval(rand($min,$max));
			srand((double)microtime() * 1000000);
			$this->b = intval(rand($min,$max));
		}

		function change_TTF()
		{
			if(count($this->TTF_RANGE) > 0){
				if(is_array($this->TTF_RANGE))
				{
					srand((float)microtime() * 10000000);
					$key = array_rand($this->TTF_RANGE);
					$this->TTF_file = $this->TTF_folder.$this->TTF_RANGE[$key];
				}
				else
				{
					$this->TTF_file = $this->TTF_folder.$this->TTF_RANGE;
				}
				return $this->TTF_file;
			}
		}

} // END CLASS masc_captcha