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   1  <?php
   2  if ( !extension_loaded( 'gd' ) ) return;
   3  
   4  /**
   5   * From an original idea of :
   6   *
   7   * @author  Jose Rodriguez <jose.rodriguez@exec.cl>
   8   * @license GPLv3
   9   * @link    http://code.google.com/p/cool-php-captcha
  10   * @package captcha
  11   * @version 0.3
  12   *
  13   */
  14  
  15  class MP_Form_field_type_captcha_gd2_googlelike
  16  {
  17      public $width  = 200;                                                        /** Width of the image */
  18      public $height = 70;                                                        /** Height of the image */
  19      public $minWordLength = 5;                                                    /** Min word length ( for non-dictionary random text generation ) */
  20      /**
  21       * Max word length ( for non-dictionary random text generation )
  22       * 
  23       * Used for dictionary words indicating the word-length
  24       * for font-size modification purposes
  25       */
  26      public $maxWordLength = 8;
  27      public $session_var = 'mp_googlelike';                                            /** Sessionname to store the original text */
  28      public $backgroundColor = array( 255, 255, 255 );                                        /** Background color in RGB-array */
  29      public $colors = array( array( 27,78,181 )/*blue*/, array( 22,163,35 )/*green*/, array( 214,36,7 ) /*red*/ ); /** Foreground colors in RGB-array */
  30      public $shadowColor = null; //array( 0, 0, 0 );                                        /** Shadow color in RGB-array or null */
  31  
  32      public $fonts = array( 
  33          'Antykwa'  => array( 'spacing' => -3, 'minSize' => 27, 'maxSize' => 30, 'font' => 'AntykwaBold.ttf' ),                //
  34          'Candice'  => array( 'spacing' =>-1.5,'minSize' => 28, 'maxSize' => 31, 'font' => 'Candice.ttf' ),                // Font configuration
  35          'DingDong' => array( 'spacing' => -2, 'minSize' => 24, 'maxSize' => 30, 'font' => 'Ding-DongDaddyO.ttf' ),             // - font: TTF file
  36          'Duality'  => array( 'spacing' => -2, 'minSize' => 30, 'maxSize' => 38, 'font' => 'Duality.ttf' ),                // - spacing: relative pixel space between character
  37          'Heineken' => array( 'spacing' => -2, 'minSize' => 24, 'maxSize' => 34, 'font' => 'Heineken.ttf' ),                // - minSize: min font size
  38          'Jura'     => array( 'spacing' => -2, 'minSize' => 28, 'maxSize' => 32, 'font' => 'Jura.ttf' ),                    // - maxSize: max font size
  39          'StayPuft' => array( 'spacing' =>-1.5,'minSize' => 28, 'maxSize' => 32, 'font' => 'StayPuft.ttf' ),
  40          'VeraSans' => array( 'spacing' => -1, 'minSize' => 20, 'maxSize' => 28, 'font' => 'VeraSansBold.ttf' ),
  41          'VeraSeBd'    => array( 'spacing' => -2, 'minSize' => 24, 'maxSize' => 30, 'font' => 'VeraSeBd.ttf' ),
  42       );
  43  
  44      public $Yperiod    = 12;                                                        /** Wave configuracion in X and Y axes */
  45      public $Yamplitude = 14;
  46      public $Xperiod    = 11;
  47      public $Xamplitude = 5;
  48  
  49      public $maxRotation = 8;                                                    /** letter rotation clockwise */
  50  
  51      /**
  52       * Internal image size factor ( for better image quality )
  53       * 1: low, 2: medium, 3: high
  54       */
  55      public $scale = 2;
  56  
  57      /** 
  58       * Blur effect for better image quality ( but slower image processing ).
  59       * Better image results with scale=3
  60       */
  61      public $blur = false;
  62  
  63      /** Debug? */
  64      public $debug = false;
  65      
  66      /** Image format: jpeg or png */
  67      public $imageFormat = 'png';
  68  
  69  
  70      /** GD image */
  71      public $im;
  72  
  73  	function __construct()
  74      {
  75          session_start();
  76  
  77          $root = __DIR__ . '/words/';
  78          if ( is_dir( $root ) ) 
  79          {
  80              $dir = @opendir( $root );
  81              if ( $dir ) while ( ( $file = readdir( $dir ) ) !== false )  if ( ( $file{0} != '.' ) && ( substr( $file, -4 ) == '.php' ) )  $xlangs[] = strtolower( substr( $file, 0, -4 ) );
  82              @closedir( $dir );
  83          }
  84  
  85          $lang = $xlangs[array_rand( $xlangs )];
  86  
  87          $HTTP_ACCEPT_LANGUAGE     = filter_input( INPUT_SERVER, 'HTTP_ACCEPT_LANGUAGE' );
  88          if ( !empty( $HTTP_ACCEPT_LANGUAGE ) ) 
  89          {
  90              $lang_http  = substr( $HTTP_ACCEPT_LANGUAGE, 0, 2 );
  91              if ( in_array( $lang_http, $xlangs ) ) $lang = $lang_http;
  92          }
  93          $this->wordsFile = $root . "$lang.php";
  94  
  95          $this->CreateImage();
  96  
  97          ob_end_clean();
  98          if ( $this->imageFormat == 'png' && function_exists( 'imagepng' ) ) 
  99          {
 100              header( 'Content-type: image/png' );
 101              imagepng( $this->im );
 102          } else {
 103              header( 'Content-type: image/jpeg' );
 104              imagejpeg( $this->im, null, 80 );
 105          }
 106          imagedestroy ( $this->im );
 107          die();
 108      }
 109  
 110  	public function CreateImage() {
 111          $ini = microtime( true );
 112  
 113          /** Initialization */
 114          $this->ImageAllocate();
 115          
 116          /** Text insertion */
 117          $text = $this->GetCaptchaText();
 118  
 119          $fontcfg  = $this->fonts[array_rand( $this->fonts )];
 120          $this->WriteText( $text, $fontcfg );
 121  
 122          $_SESSION[$this->session_var] = $text;
 123  
 124          /** Transformations */
 125          $this->WaveImage();
 126          if ( $this->blur && function_exists( 'imagefilter' ) ) imagefilter( $this->im, IMG_FILTER_GAUSSIAN_BLUR );
 127          $this->ReduceImage();
 128  
 129          if ( $this->debug ) imagestring( $this->im, 1, 1, $this->height-8, "$text {$fontcfg['font']} ".round( ( microtime( true )-$ini )*1000 )."ms", $this->GdFgColor );
 130      }
 131  
 132      /**
 133      * Creates the image resources
 134      */
 135  	protected function ImageAllocate() 
 136      {
 137          // Cleanup
 138          if ( !empty( $this->im ) ) imagedestroy( $this->im );
 139  
 140          $this->im = imagecreatetruecolor( $this->width*$this->scale, $this->height*$this->scale );
 141  
 142          // Background color
 143          $this->GdBgColor = imagecolorallocate( $this->im, $this->backgroundColor[0], $this->backgroundColor[1], $this->backgroundColor[2] );
 144          imagefilledrectangle( $this->im, 0, 0, $this->width*$this->scale, $this->height*$this->scale, $this->GdBgColor );
 145  
 146          // Foreground color
 147          $color = $this->colors[mt_rand( 0, sizeof( $this->colors )-1 )];
 148          $this->GdFgColor = imagecolorallocate( $this->im, $color[0], $color[1], $color[2] );
 149  
 150          // Shadow color
 151          if ( !empty( $this->shadowColor ) && is_array( $this->shadowColor ) && sizeof( $this->shadowColor ) >= 3 ) $this->GdShadowColor = imagecolorallocate( $this->im, $this->shadowColor[0], $this->shadowColor[1], $this->shadowColor[2] );
 152      }
 153  
 154      /**
 155      * Text generation
 156      *
 157      * @return string Text
 158      */
 159  	protected function GetCaptchaText() 
 160      {
 161          $text = $this->GetDictionaryCaptchaText();
 162          if ( !$text ) $text = $this->GetRandomCaptchaText();
 163          return $text;
 164      }
 165  
 166      /**
 167      * Random dictionary word generation
 168      *
 169      * @param boolean $extended Add extended "fake" words
 170      * @return string Word
 171      */
 172  	function GetDictionaryCaptchaText( $extended = false ) 
 173      {
 174          if ( empty( $this->wordsFile ) ) return false;
 175  
 176          $fp     = fopen( $this->wordsFile, "r" );
 177          $length = strlen( fgets( $fp ) );
 178          if ( !$length ) return false;
 179  
 180          $line   = rand( 1, ( filesize( $this->wordsFile )/$length )-2 );
 181          if ( fseek( $fp, $length*$line ) == -1 ) return false;
 182  
 183          $text = trim( fgets( $fp ) );
 184          fclose( $fp );
 185  
 186          /** Change ramdom volcals */
 187          if ( $extended ) 
 188          {
 189              $text   = preg_split( '//', $text, -1, PREG_SPLIT_NO_EMPTY );
 190              $vocals = array( 'a', 'e', 'i', 'o', 'u' );
 191              foreach ( $text as $i => $char ) if ( mt_rand( 0, 1 ) && in_array( $char, $vocals ) ) $text[$i] = $vocals[mt_rand( 0, 4 )];
 192              $text = implode( '', $text );
 193          }
 194          return $text;
 195      }
 196  
 197      /**
 198      * Random text generation
 199      *
 200      * @return string Text
 201      */
 202  	protected function GetRandomCaptchaText( $length = null ) 
 203      {
 204          if ( empty( $length ) ) $length = rand( $this->minWordLength, $this->maxWordLength );
 205          $words  = "abcdefghijlmnopqrstvwyz";
 206          $vocals = "aeiou";
 207          $text  = "";
 208          $vocal = rand( 0, 1 );
 209          for ( $i = 0; $i < $length; $i++ ) 
 210          {
 211              $text .= ( $vocal ) ? substr( $vocals, mt_rand( 0, 4 ), 1 ) : substr( $words, mt_rand( 0, 22 ), 1 );
 212              $vocal = !$vocal;
 213          }
 214          return $text;
 215      }
 216  
 217      /**
 218      * Text insertion
 219      */
 220  	protected function WriteText( $text, $fontcfg = array() ) 
 221      {
 222      // Select the font configuration
 223          if ( empty( $fontcfg ) ) $fontcfg  = $this->fonts[array_rand( $this->fonts )];
 224  
 225          // Full path of font file
 226          $fontfile = __DIR__ . '/fonts/' . $fontcfg['font'];
 227          /**
 228           *  Increase font-size for shortest words: 9% for each glyp missing */
 229          $lettersMissing = $this->maxWordLength-strlen( $text );
 230          $fontSizefactor = 1+( $lettersMissing*0.09 );
 231  
 232          // Text generation ( char by char )
 233          $x      = 20*$this->scale;
 234          $y      = round( ( $this->height*27/40 )*$this->scale );
 235          $length = strlen( $text );
 236          for ( $i = 0; $i < $length; $i++ ) 
 237          {
 238              $degree   = rand( $this->maxRotation*-1, $this->maxRotation );
 239              $fontsize = rand( $fontcfg['minSize'], $fontcfg['maxSize'] )*$this->scale*$fontSizefactor;
 240              $letter   = substr( $text, $i, 1 );
 241  
 242              if ( $this->shadowColor ) $coords = imagettftext( $this->im, $fontsize, $degree, $x+$this->scale, $y+$this->scale, $this->GdShadowColor, $fontfile, $letter );
 243              $coords = imagettftext( $this->im, $fontsize, $degree, $x, $y, $this->GdFgColor, $fontfile, $letter );
 244              $x += ( $coords[2]-$x ) + ( $fontcfg['spacing']*$this->scale );
 245          }
 246      }
 247  
 248      /**
 249      * Wave filter
 250      */
 251  	protected function WaveImage() 
 252      {
 253          // X-axis wave generation
 254          $xp = $this->scale*$this->Xperiod*rand( 1,3 );
 255          $k = rand( 0, 100 );
 256          for ( $i = 0; $i < ( $this->width*$this->scale ); $i++ )  imagecopy( $this->im, $this->im, $i-1, sin( $k+$i/$xp ) * ( $this->scale*$this->Xamplitude ), $i, 0, 1, $this->height*$this->scale );
 257  
 258          // Y-axis wave generation
 259          $k = rand( 0, 100 );
 260          $yp = $this->scale*$this->Yperiod*rand( 1,2 );
 261          for ( $i = 0; $i < ( $this->height*$this->scale ); $i++ ) imagecopy( $this->im, $this->im, sin( $k+$i/$yp ) * ( $this->scale*$this->Yamplitude ), $i-1, 0, $i, $this->width*$this->scale, 1 );
 262      }
 263  
 264      /**
 265      * Reduce the image to the final size
 266      */
 267  	protected function ReduceImage() 
 268      {
 269          $imResampled = imagecreatetruecolor( $this->width, $this->height );
 270          imagecopyresampled( $imResampled, $this->im, 0, 0, 0, 0, $this->width, $this->height, $this->width*$this->scale, $this->height*$this->scale );
 271          imagedestroy( $this->im );
 272          $this->im = $imResampled;
 273      }
 274  }
 275  new MP_Form_field_type_captcha_gd2_googlelike();