<?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
* @copyright Copyright (C) 2000 - 2002 Kenzaburo Ito - kenito@300baud.org
* @copyright Copyright (C) 2002 - 2014 MantisBT Team - mantisbt-dev@lists.sourceforge.net
* @author Marcello Scata' <marcelloscata at users.sourceforge.net> ITALY
* @link http://www.mantisbt.org
*/
/**
* MantisBT Core API's
*/
require_once( 'core.php' );
$t_form_key = session_get( CAPTCHA_KEY );
$t_key = utf8_strtolower( utf8_substr( md5( config_get( 'password_confirm_hash_magic_string' ) . $t_form_key ), 1, 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_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 generate_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++)
{
$size = intval(mt_rand((int)($this->minsize / 2.3), (int)($this->maxsize / 1.7)));
$angle = intval(mt_rand(0, 360));
$x = intval(mt_rand(0, $this->lx));
$y = intval(mt_rand(0, (int)($this->ly - ($size / 5))));
$this->random_color(160, 224);
$color = $func2($image, $this->r, $this->g, $this->b);
$text = chr(intval(mt_rand(45,250)));
if(count ($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 foreground with chars and shadows: (".$this->chars.")";
for($i=0, $x = intval(mt_rand($this->minsize,$this->maxsize)); $i < $this->chars; $i++)
{
$text = utf8_strtoupper(substr($private_key, $i, 1));
$angle = intval(mt_rand(($this->maxrotation * -1), $this->maxrotation));
$size = intval(mt_rand($this->minsize, $this->maxsize));
$y = intval(mt_rand((int)($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 {
$t_font = mt_rand(3,5);
imagestring($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 + ($this->minsize / 5));
}
# Generate the JPEG
ob_start();
@ImageJPEG($image, null, $this->jpegquality);
$jpg = ob_get_contents();
ob_end_clean();
@ImageDestroy($image);
if($this->debug) echo "\n<br />-Captcha-Debug: Destroy Imagestream.";
return $jpg;
}
function make_captcha( $private_key )
{
# Retrieve previously image generated from session cache
$t_image = session_get( CAPTCHA_IMG, null );
if( is_null( $t_image ) ) {
$t_image = $this->generate_captcha( $private_key );
if( $this->debug ) {
echo "\n<br />-Captcha-Debug: Caching generated image.";
}
session_set( CAPTCHA_IMG, $t_image );
} elseif( $this->debug ) {
echo "\n<br />-Captcha-Debug: Retrieved image from cache.";
}
# Output
if( $this->debug ) {
echo "\n<br />-Captcha-Debug: Generated image (" . strlen( $t_image ) . " bytes): "
. '<img src="data:image/jpeg;base64,' . base64_encode( $t_image ) . '">';
} else {
header('Content-type: image/jpeg');
echo $t_image;
}
}
/** @private **/
function makeWebsafeColors(&$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)
{
$this->r = intval(mt_rand($min,$max));
$this->g = intval(mt_rand($min,$max));
$this->b = intval(mt_rand($min,$max));
}
function change_TTF()
{
if(count($this->TTF_RANGE) > 0){
if(is_array($this->TTF_RANGE))
{
$key = array_rand($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