/wwwroot/mantis/make_captcha_img.php
PHP | 318 lines | 216 code | 33 blank | 69 comment | 49 complexity | 8d09afd92f4a0b49bc7e9d6b4ba168e6 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.1, Apache-2.0, LGPL-3.0, BSD-3-Clause
- <?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