--- textimage.module 2006-04-12 03:30:25.000000000 -0500 +++ textimage-new.module 2006-04-12 03:28:22.000000000 -0500 @@ -24,7 +24,7 @@ '#required' => TRUE, '#validate' => array('_captcha_validate' => array()), '#description' => t('Please type in the letters/numbers that are shown in the image above.'), - '#prefix' => 'Captcha Image: you will need to recognize the text in it.', + '#prefix' => 'Captcha Image: you will need to recognize the text in it.', ); return $form; @@ -51,7 +51,8 @@ $suffix = ''; - if (arg(2)!=null) $suffix='/'.arg(2); + if (arg(2)!=null) $suffix='/'.arg(2); + $items[] = array( 'path' => '_textimage/image'.$suffix, 'title' => t('textimage'), @@ -69,7 +70,8 @@ function textimage_settings() { - $fonts_path = variable_get("textimage_fonts_path", ""); + $fonts_path = variable_get("textimage_fonts_path", ""); + $images_path = variable_get("textimage_images_path", ""); //check for GD if (!function_exists(imagecreate)) @@ -82,12 +84,23 @@ //check for valid font path elseif ($fonts_path!="" && !is_dir($fonts_path)) drupal_set_message(t('The current font path is invalid. The default font will be used.')); - + + //check for valid image path + if ($images_path!="" && !is_dir($images_path)) + drupal_set_message(t('The current images path is invalid. No images will be used.')); + + //Fonts settings $form['fonts'] = array( '#type' => 'fieldset', '#title' => t('Fonts settings'), '#collapsible' => TRUE, '#collapsed' => FALSE ); + + $form['images'] = array( + '#type' => 'fieldset', '#title' => t('Image settings'), + '#collapsible' => TRUE, '#collapsed' => FALSE + ); + $form['fonts']['textimage_fonts_path'] = array( '#type' => 'textfield', '#title' => t('TrueType Fonts Path'), @@ -102,9 +115,88 @@ '#default_value' => variable_get('captcha_font_size',24), '#size' => 5, '#maxlength' => 2, - '#description' => t('Font size of Captcha text. (Only work with non-default fonts)'), - ); - + '#description' => t('Font size of Captcha text (in pixels).'), + '#validate' => array("_textimage_number_validate" => array("captcha_font_size")), + ); + $form['fonts']['captcha_char_spacing_max'] = array( + '#type' => 'textfield', + '#title' => t('Character Spacing'), + '#default_value' => variable_get('captcha_char_spacing_max',10), + '#size' => 5, + '#maxlength' => 4, + '#description' => t('Sets the kerning between letters in Captcha. Higher numbers indicate more spacing.'), + '#validate' => array("_textimage_number_validate" => array("captcha_char_spacing_max")), + ); + + $form['fonts']['captcha_char_jiggle_amount'] = array( + '#type' => 'textfield', + '#title' => t('Character Jiggle'), + '#default_value' => variable_get('captcha_char_jiggle_amount',5), + '#size' => 5, + '#maxlength' => 2, + '#description' => t('Sets the amount of up and down movement in the Captcha letters. Higher numbers indicate more jiggling.'), + '#validate' => array("_textimage_number_validate" => array("captcha_char_jiggle_amount")), + ); + + $form['fonts']['captcha_char_rotate_amount'] = array( + '#type' => 'textfield', + '#title' => t('Character Rotation'), + '#default_value' => variable_get('captcha_char_rotate_amount',5), + '#size' => 5, + '#maxlength' => 2, + '#description' => t('Sets the amount of rotation in the Captcha letters (in degrees, only works with non-default fonts).'), + '#validate' => array("_textimage_number_validate" => array("captcha_char_rotate_amount")), + ); + + $form['fonts']['captcha_char_size_amount'] = array( + '#type' => 'textfield', + '#title' => t('Character Size Adjustment'), + '#default_value' => variable_get('captcha_char_size_amount',2), + '#size' => 5, + '#maxlength' => 2, + '#description' => t('Sets the amount of variation in size between the different letters in the Captcha (in pixels).'), + '#validate' => array("_textimage_number_validate" => array("captcha_char_size_amount")), + ); + + $form['images']['textimage_images_path'] = array( + '#type' => 'textfield', + '#title' => t('Background Images Path'), + '#default_value' => $images_path, + '#size' => 30, + '#maxlength' => 255, + '#description' => t('Location of the directory where the background images are stored. If you do not provide a directory, solid colors will be used. Relative paths will be resolved relative to the Drupal installation directory.'), + ); + + $form['images']['captcha_image_noise'] = array( + '#type' => 'textfield', + '#title' => t('Image Noise (pixels)'), + '#default_value' => variable_get('captcha_image_noise',4), + '#size' => 5, + '#maxlength' => 4, + '#description' => t('Sets the amount of noise (random pixels) in the Captcha image. Higher numbers indicate more noise.'), + '#validate' => array("_textimage_number_validate" => array("captcha_image_noise")), + ); + + $form['images']['captcha_image_lines'] = array( + '#type' => 'textfield', + '#title' => t('Image Noise (lines)'), + '#default_value' => variable_get('captcha_image_lines',4), + '#size' => 5, + '#maxlength' => 4, + '#description' => t('Sets the amount of noise (random lines) in the Captcha image. Higher numbers indicate more noise.'), + '#validate' => array("_textimage_number_validate" => array("captcha_image_lines")), + ); + + $form['images']['captcha_image_margin'] = array( + '#type' => 'textfield', + '#title' => t('Image Margin'), + '#default_value' => variable_get('captcha_image_margin',10), + '#size' => 5, + '#maxlength' => 4, + '#description' => t('Set a distance between the Captcha letters and the edges of the image.'), + '#validate' => array("_textimage_number_validate" => array("captcha_image_margin")), + ); + $form['info'] = array( '#type' => 'fieldset', '#title' => t('Image and font information'), '#collapsible' => TRUE, '#collapsed' => FALSE @@ -112,6 +204,9 @@ if (isset($fonts_path)) { $imagefontinfo .= t('Number of fonts found: ').count(_textimage_font_list()); } + if (isset($images_path)) { + $imagefontinfo .= '
'.t('Number of background images found: ').count(_textimage_image_list()); + } $gdinfo = gd_info(); $imagefontinfo .= '
'.t('GD Version: ').$gdinfo["GD Version"]; @@ -128,9 +223,18 @@ } function textimage_settings_form_validate ($form_id,$form) { - //check for valid font path - if ($form['textimage_fonts_path'] !="" && !is_dir($form['textimage_fonts_path'])) - form_set_error('textimage_fonts_path', t('The entered font path is invalid')); + //check for valid font path + if ($form['textimage_fonts_path'] !="" && !is_dir($form['textimage_fonts_path'])) + form_set_error('textimage_fonts_path', t('The entered font path is invalid')); + //check for valid image path + if ($form['textimage_images_path'] !="" && !is_dir($form['textimage_images_path'])) + form_set_error('textimage_images_path', t('The entered image path is invalid')); +} + +function _textimage_number_validate ($field,$fieldName) { + if (!is_numeric($field['#value'])) { + form_set_error($fieldName,t("The value for")." ".t($field['#title'])." ".t("must be a number")); + } } /** @@ -138,9 +242,6 @@ */ function _textimage_image() { - // there are a few hard coded functions I'd like to eliminate here, - // but for the time being we'll let them be. - //if we don't have GD2 functions, we can't generate the image if (!function_exists('imagecreatetruecolor')) return; @@ -154,82 +255,157 @@ $string = _textimage_code(); - // set up image, the first number is the width and the second is the height - $im = imagecreatetruecolor(180, 80); - - // creates two variables to store color - $background = imagecolorallocate($im, rand(180, 250), rand(180, 250), rand(180, 250)); - $foreground = imagecolorallocate($im, rand(0, 80), rand(0, 80), rand(0, 80)); - - // fill image with bgcolor - imagefill($im, 0, 0, $background); - // Get truetype font list $fonts = _textimage_font_list(); + // Get the background images list + $images = _textimage_image_list(); + // Randomization amounts: + $charSpacingMax = variable_get('captcha_char_spacing_max',10); // Letter spacing max (pixels) + $charSpacingMin = max($charSpacingMax*.5,0); // Letter spacing minimum (pixels) + $charJiggleAmount = variable_get('captcha_char_jiggle_amount',5); // Up and down randomization (pixels) + $charRotateAmount = variable_get('captcha_char_rotate_amount',5); // Character rotation amount (degrees) + $charSizeAmount = variable_get('captcha_char_size_amount',2); // Character size amount (pixels) + + $imageRotateAmount = variable_get('captcha_image_rotate_amount',12); // Image rotation amount (degrees) + + // Static amounts: + $charInitialSize = variable_get('captcha_font_size',24); // Initial Font + $imageNoise = variable_get('captcha_image_noise',4); // Amount of noise added to image + $imageLines = variable_get('captcha_image_lines',4); // Amount of noise added to image + $imageMargin = variable_get('captcha_image_margin',10); // Margin around image (pixels) + // writes string if (function_exists(imagettftext) && count($fonts) > 0) { - // write text using a truetype font - $charSize = variable_get('captcha_font_size',24); // font size - $charWidth = 0; // width of previous character - $x = 10; // initial x position - $y = 30; - - // iterate over characters + + // Initialize variables for the loop + $characterDetails = array(); // contains the final info about each character + + // Build a list of character settings for the captcha string for ($i=0;$i $charSize, + "angle" => $charAngle, + "x" => $x, + "y" => $y, + "color" => $foreground, + "font" => $font, + "char" => $char + ); + + // Increment the image size + $imageWidth = $x + $charWidth; + $imageHeight = max($imageHeight,$y+$charJiggleAmount); } - } + + // Create the image based off the string length and margin + if (count($images) > 0) { + // We're going to be using an image, and need a tranparent background to start with + $im = _textimage_create_transparent_image($imageWidth+2*$imageMargin, $imageHeight+2*$imageMargin); + $noisecolor = imagecolorallocatealpha($im, 0, 0, 0, 127); + } else { + // Just make a plain-jane color brackground + $im = imagecreatetruecolor($imageWidth+2*$imageMargin, $imageHeight+2*$imageMargin); + $background = imagecolorallocate($im, rand(180, 250), rand(180, 250), rand(180, 250)); + $noisecolor = $background; + imagefill($im, 0, 0, $background); + } + + + // Specify colors to be used in the image + $foreground = imagecolorallocate($im, rand(0, 80), rand(0, 80), rand(0, 80)); + + foreach($characterDetails as $char) { + // draw character + imagettftext($im,$char['size'],$char['angle'],$char['x']+$imageMargin,$char['y']+$imageMargin,$foreground,$char['font'],$char['char']); + } + } + else { // write text using a built-in font - $x = 10; + $x = 0; $y = 0; + $imageWidth = 60 + drupal_strlen($string)*$charSpacingMax*.35; + $imageHeight = 30 + $charJiggleAmount; + // Create the image + if (count($images) > 0 && function_exists(imagecolorallocatealpha)) { + // We're going to be using an image, and need a tranparent background to start with + $im = _textimage_create_transparent_image($imageWidth, $imageHeight); + $noisecolor = imagecolorallocatealpha($im, 0, 0, 0, 127); + } else { + // Just make a plain-jane color brackground + $im = imagecreatetruecolor($imageWidth, $imageHeight); + $background = imagecolorallocate($im, rand(180, 250), rand(180, 250), rand(180, 250)); + $noisecolor = $background; + imagefill($im, 0, 0, $background); + } + + // Add the text for ($i=0;$i 0) { + // Prepare a larger image with a background image + $im2 = _textimage_create_transparent_image($imageWidth, $imageHeight); + } else { + // Prepare a larger image with a solid color + $im2 = imagecreatetruecolor($imageWidth, $imageHeight); + imagefill($im2, 0, 0, $background); + } + + $result = imagecopyresampled ($im2, $im, $imageMargin, $imageMargin, 0, 0, $imageWidth, $imageHeight, imagesx($im), imagesy($im)); + $im = $im2; } - + // strikethrough imageline($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $foreground); - - // rotate only if function is defined (many PHP installations have this function missing) - if (function_exists('imagerotate')) { - $im2 = imagerotate($im,rand(-20,45),$background); - imagedestroy($im); - $im = $im2; - } - - // add cloud only if function is defined (many PHP installations have this function missing) - if (function_exists('imagecolorallocatealpha')) { - $middleground = imagecolorallocatealpha($im, rand(160, 200), rand(160, 200), rand(160, 200), 80); - - // random shapes - for ($x=0; $x<50;$x++) { - imageline($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground); - imageellipse($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground); + + // Add Noise + for ($x=0; $x<$imageWidth; $x++) { + for ($row=0; $row<$imageNoise;$row++) { + $y = rand(0,$imageHeight); + imagesetpixel($im, $x, $y, $noisecolor); } } + // Add Lines and Ellipses + for ($x=0; $x<$imageLines;$x++) { + imageline($im, rand(0, $imageWidth), rand(0, $imageHeight), rand(0, $imageWidth), rand(0, $imageHeight), $noisecolor); + imageellipse($im, rand(0, $imageWidth), rand(0, $imageHeight), rand(0, $imageWidth), rand(0, $imageHeight), $noisecolor); + } + + // Fill image with a random background image if available + if (count($images) > 0) { + $image = $images[rand(0,count($images)-1)]; + _textimage_apply_background_image($im,$image); + } //output to browser imagepng($im); @@ -252,7 +428,7 @@ } $string = $const[0] . $vow[0] .$const[2] . $const[1] . $vow[1] . $const[3] . $vow[3] . $const[4]; - $string = drupal_substr($string,0,rand(5,8)); + $string = drupal_substr($string,0,rand(4,6)); //everytime we create a new code, we write it to session $_SESSION['captcha'] = drupal_strtolower($string); @@ -279,4 +455,63 @@ return $filelist; } +/** +* Returns an array of files with jpg, png, and gif extensions in the specified directory. +*/ +function _textimage_image_list() { + $imagesdir = variable_get("textimage_images_path", ""); + + $filelist = array(); + if (is_dir($imagesdir) && $handle = opendir($imagesdir)) { + while ($file = readdir($handle)) { + if (preg_match("/\.gif|\.png|\.jpg$/i",$file) == 1) + $filelist[] = $imagesdir.'/'.$file; + } + closedir($handle); + } + + return $filelist; +} + +/** +* Overlays an image to the supplied image resource +*/ +function _textimage_apply_background_image (&$imageResource,$imageFile) { + $backgroundResource = image_gd_open($imageFile,substr($imageFile,-3)); + // Copy the text onto the background + $backX = imagesx($backgroundResource); + $backY = imagesy($backgroundResource); + $textX = imagesx($imageResource); + $textY = imagesy($imageResource); + + $randomBackX = rand(0,$backX-$textX); + $randomBackY = rand(0,$backY-$textY); + + // Place the text onto a random location of the background image + imagecopyresampled($backgroundResource,$imageResource,$randomBackX,$randomBackY,0,0,$textX,$textY,$textX,$textY); + // Crop the background image to the original image size + imagecopyresampled($imageResource,$backgroundResource,0,0,$randomBackX,$randomBackY,$textX,$textY,$textX,$textY); +} + +/** +* Creates transparent image resources for images with graphic backgrounds +*/ +function _textimage_create_transparent_image($x, $y) { + $i = imagecreatetruecolor($x, $y); + $b = imagecreatefromstring(base64_decode(_text_image_blankpng())); + imagealphablending($i, false); + imagesavealpha($i, true); + imagecopyresized($i, $b ,0 ,0 ,0 ,0 ,$x, $y, imagesx($b), imagesy($b)); + return $i; +} + +function _text_image_blankpng() { + $c = "iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAYAAACM/rhtAAAABGdBTUEAAK/INwWK6QAAABl0RVh0U29m"; + $c .= "dHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAADqSURBVHjaYvz//z/DYAYAAcTEMMgBQAANegcCBNCg"; + $c .= "dyBAAA16BwIE0KB3IEAADXoHAgTQoHcgQAANegcCBNCgdyBAAA16BwIE0KB3IEAADXoHAgTQoHcgQAAN"; + $c .= "egcCBNCgdyBAAA16BwIE0KB3IEAADXoHAgTQoHcgQAANegcCBNCgdyBAAA16BwIE0KB3IEAADXoHAgTQ"; + $c .= "oHcgQAANegcCBNCgdyBAAA16BwIE0KB3IEAADXoHAgTQoHcgQAANegcCBNCgdyBAAA16BwIE0KB3IEAA"; + $c .= "DXoHAgTQoHcgQAANegcCBNCgdyBAgAEAMpcDTTQWJVEAAAAASUVORK5CYII="; + return $c; +} ?>