Implements an image recognition captcha.

"; break; case 'admin/modules#description': case 'admin/modules/textimage': case 'admin/textimage': $output = t('Implements an image recognition captcha.'); break; } return $output; } function textimage_captchachallenge(&$form) { $form['captcha_response'] = array ( '#type' => 'textfield', '#title' => t('Captcha Validation'), '#default_value' => '', '#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.', ); return $form; } function textimage_captchavalidate(&$captcha_word, &$correct) { $captcha_word = drupal_strtolower($captcha_word); if (($_SESSION['captcha'] != '') && $captcha_word == $_SESSION['captcha']) { $correct = true; } else { $correct = false; form_set_error('captcha_response', t('The image verification code you entered is incorrect.')); } } /** * Implementation of hook_menu(). */ function textimage_menu($may_cache) { $items = array(); $suffix = ''; if (arg(2)!=null) $suffix='/'.arg(2); $items[] = array( 'path' => '_textimage/image'.$suffix, 'title' => t('textimage'), 'callback' => '_textimage_image', 'access' => user_access('access textimages'), 'type' => MENU_CALLBACK ); return $items; } function textimage_perm() { return array('access textimages'); } function textimage_settings() { $fonts_path = variable_get("textimage_fonts_path", ""); $images_path = variable_get("textimage_images_path", ""); //check for GD if (!function_exists(imagecreate)) drupal_set_message(t('Image library not available. Textimage needs the GD library extension to be installed. Please install GD.')); //check for TTF support elseif (!function_exists(imagettftext)) drupal_set_message(t('Your image library does not seem to have TrueType font support. Textimage will work, but will use the default inbuilt font.'),'status'); //check for valid font path elseif ($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['fonts']['textimage_use_only_upper'] = array( '#type' => 'checkbox', '#title' => t('Use only Uppercase'), '#default_value' => variable_get('textimage_use_only_upper',0) ); $form['fonts']['textimage_fonts_path'] = array( '#type' => 'textfield', '#title' => t('TrueType Fonts Path'), '#default_value' => $fonts_path, '#size' => 30, '#maxlength' => 255, '#description' => t('Location of the directory where the Truetype (.ttf) fonts are stored. If you do not provide any fonts, the module will use the default font for text. Relative paths will be resolved relative to the Drupal installation directory.'), ); $form['fonts']['textimage_font_size'] = array( '#type' => 'textfield', '#title' => t('Font Size'), '#default_value' => variable_get('textimage_font_size',24), '#size' => 5, '#maxlength' => 2, '#description' => t('Font size of Captcha text (in pixels).'), '#validate' => array("_textimage_number_validate" => array("textimage_font_size")), ); $form['fonts']['textimage_char_spacing_max'] = array( '#type' => 'textfield', '#title' => t('Character Spacing'), '#default_value' => variable_get('textimage_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("textimage_char_spacing_max")), ); $form['fonts']['textimage_char_jiggle_amount'] = array( '#type' => 'textfield', '#title' => t('Character Jiggle'), '#default_value' => variable_get('textimage_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("textimage_char_jiggle_amount")), ); $form['fonts']['textimage_char_rotate_amount'] = array( '#type' => 'textfield', '#title' => t('Character Rotation'), '#default_value' => variable_get('textimage_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("textimage_char_rotate_amount")), ); $form['fonts']['textimage_char_size_amount'] = array( '#type' => 'textfield', '#title' => t('Character Size Adjustment'), '#default_value' => variable_get('textimage_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("textimage_char_size_amount")), ); //Image settings $form['images'] = array( '#type' => 'fieldset', '#title' => t('Image settings'), '#collapsible' => TRUE, '#collapsed' => FALSE ); $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']['textimage_image_noise'] = array( '#type' => 'textfield', '#title' => t('Image Noise (pixels)'), '#default_value' => variable_get('textimage_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("textimage_image_noise")), ); $form['images']['textimage_image_lines'] = array( '#type' => 'textfield', '#title' => t('Image Noise (lines)'), '#default_value' => variable_get('textimage_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("textimage_image_lines")), ); $form['images']['textimage_image_margin'] = array( '#type' => 'textfield', '#title' => t('Image Margin'), '#default_value' => variable_get('textimage_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("textimage_image_margin")), ); $form['info'] = array( '#type' => 'fieldset', '#title' => t('Image and font information'), '#collapsible' => TRUE, '#collapsed' => FALSE ); if (isset($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"]; $imagefontinfo .= '
'.t(' FreeType Support: '); $imagefontinfo .= ($gdinfo["FreeType Support"]==true) ? 'True' : 'False'; $imagefontinfo .= '
'; $form['info']['captcha_info'] = array ( '#type' => 'item', '#value' => $imagefontinfo, ); return $form; } function textimage_settings_form_validate ($form_id,$form) { //check for valid font path if ($form['textimage_fonts_path'] !="" && !is_dir($form['textimage_fonts_path'])) form_set_error('textimage_fonts_path', t('The entered font path is invalid')); //check for valid image path if ($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")); } } /** * Prints an image containing a textimage code. */ function _textimage_image() { //if we don't have GD2 functions, we can't generate the image if (!function_exists('imagecreatetruecolor')) return; // Set headers header('Expires: Mon, 01 Jan 1997 05:00:00 GMT'); header('Cache-Control: no-store, no-cache, must-revalidate'); header('Cache-Control: post-check=0, pre-check=0', false); header('Pragma: no-cache'); header('Content-type: image/png'); $string = _textimage_code(); // Get truetype font list $fonts = _textimage_font_list(); // Get the background images list $images = _textimage_image_list(); // Randomization amounts: $charSpacingMax = variable_get('textimage_char_spacing_max',10); // Letter spacing max (pixels) $charSpacingMin = max($charSpacingMax*.5,0); // Letter spacing minimum (pixels) $charJiggleAmount = variable_get('textimage_char_jiggle_amount',5); // Up and down randomization (pixels) $charRotateAmount = variable_get('textimage_char_rotate_amount',5); // Character rotation amount (degrees) $charSizeAmount = variable_get('textimage_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('textimage_font_size',24); // Initial Font $imageNoise = variable_get('textimage_image_noise',4); // Amount of noise added to image $imageLines = variable_get('textimage_image_lines',4); // Amount of noise added to image $imageMargin = variable_get('textimage_image_margin',10); // Margin around image (pixels) // write text using a truetype font if (function_exists(imagettftext) && count($fonts) > 0) { // 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 = 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), $foreground); // Add Noise for ($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($im); imagedestroy($im); } /** * Returns a random string for use in a captcha */ function _textimage_code() { $consts='bcdgjxvmnprst'; $vowels='aeiou'; for ($x=0; $x < 6; $x++) { mt_srand ((double) microtime() * 1000000); $const[$x] = drupal_substr($consts,mt_rand(0,drupal_strlen($consts)-1),1); $vow[$x] = drupal_substr($vowels,mt_rand(0,drupal_strlen($vowels)-1),1); } $string = $const[0] . $vow[0] .$const[2] . $const[1] . $vow[1] . $const[3] . $vow[3] . $const[4]; $string = drupal_substr($string,0,rand(4,6)); //everytime we create a new code, we write it to session $_SESSION['captcha'] = drupal_strtolower($string); if(variable_get('textimage_use_only_upper',0)) $string = drupal_strtoupper($string); return $string; } /** * Returns an array of files with TTF extensions in the specified directory. */ function _textimage_font_list() { $fontdir = variable_get("textimage_fonts_path", ""); $filelist = array(); if (is_dir($fontdir) && $handle = opendir($fontdir)) { while ($file = readdir($handle)) { if (preg_match("/\.ttf$/i",$file) == 1) $filelist[] = $fontdir.'/'.$file; } closedir($handle); } 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; } ?> Morabaraba | oellermann.com

Morabaraba

  • warning: Creating default object from empty value in /var/www/oellermann/modules/taxonomy.module on line 1223.
  • : preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /var/www/oellermann/includes/unicode.inc on line 291.
  • : preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /var/www/oellermann/includes/unicode.inc on line 291.
  • : preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /var/www/oellermann/includes/unicode.inc on line 291.
  • : preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /var/www/oellermann/includes/unicode.inc on line 291.
  • : preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /var/www/oellermann/includes/unicode.inc on line 291.
  • : preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /var/www/oellermann/includes/unicode.inc on line 291.

FIMS 0.1 Released, Online

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The first release of the Free Internet Morabaraba Server (FIMS) has been completed. You can connect to the server by using:

telnet fims.morabaraba.org 5000 

Details on how to use it, as well as the source code, are available from the FIMS web site.

My next priority is to get a graphical client working for Windows and Linux, after which I can start making improvements to the server.


First Game Played on FIMS

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The first Morabaraba game has been played on FIMS, the Free Internet Morabaraba Server! It was a pretty poor game, with me playing against myself (I lost...), and so I haven't recorded the game (well, FIMS has it in the database but I'll be cleaning out the database pretty soon. There is a bit of testing and tying off of loose ends to be done, but the server is up and running and should be launched very soon! Of course, not many people will be comfortable with the Telnet interface, so it will probably only be when a client is available that things really take off. I hope to have a (Windows|Linux) client released not too long after the server's first release.

FIMS will provide a place where players from all around the world can find an opponent and play a game. The server also provides rudimentary chat facilities, which will be expanded in future versions. By design, it should scale to very large groups of users (although that hasn't been tested), so I hope to see it become the definitive place for online Morabaraba (which currently has no online place).

If you're interested in beta testing or contributing to the project (it's in C# on Mono, runs happily on Windows and Linux) please contact me . If you just want to play, keep checking out http://www.morabaraba.org , where details will be posted when it goes live.


FIMS Approaching Release

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The first release of the Free Internet Morabaraba Server is nearing completion. The telnet server has been running continuously on a server for a few days without problems, so the network code seems to be stable. A lot more functionality is in, too, including online registration with email based confirmation. The code which understands Morabaraba positions and validates moves for legality is finished and tested (I've written a small test suite to exercise the code, though there may still be lurking bugs). The actual gameplay mechanisms are next, followed by a little bit of documentation and packaging for GPL v3 release!

I haven't done any scalability testing, but the design of the code and supporting database should scale to (at least) thousands of users on reasonably modest hardware.

Anyway, after the first server release, I aim to follow up quickly with a GUI client as well as an interface to allow my Morabaraba-playing program to join the fray (that way a willing opponent will always be online). After that, a number of "nice-to-have" features (ideas borrowed mostly from FICS) will be added to the server. The server design is such that it could be genericised relatively easily, allowing one server to support Morabaraba, SesothoMorabaraba and many other turn-oriented board games (draughts? mancala games? anything else?)

If you're a programmer (preferably C#) with an interest in Morabaraba, and you'd like to help work on FIMS, now is a good time to contact me (adam@oellermann.com) and get involved!


Free Internet Morabaraba Server

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I've spent some time today moving the Free Internet Morabaraba Server forward. I have abandoned the PHP-based telnet server (though it was cute), and implemented a .NET based server. I'm doing the development in C# using MonoDevelop on Linux, which I haven't touched for ages. I'm very impressed with how it's come along - MonoDevelop is stable and capable, and Mono is much, much easier to set up than it used to be (it was a doddle on Ubuntu).

Anyway, I have the basic telnet handler set up, backed by a MySQL database for user registrations and so forth. Simple communications between logged in users are done, and the next step is to automate registration and implement the gameplay features. The protocol is inspired by FICS, though much, much simpler - but in time I should be able to add ratings etc. The server design should be quite scalable, and, because it's Mono-based, it will be cross-platform. Another day or two's work would probably see a first version in place, although unfortunately I suspect it may be another week or two before I get to do said other day or two of work!

After that, I will need to create a client - but given the Lazarus GUI stuff I already have for Morabaraba, I may just do the first version quickly in Lazarus.


Morabaraba Opening Book

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It's been another long hiatus since the last release of my Morabaraba program, but at last there's a new version in the pipeline.


Morabaraba Board Control Nearly Done

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In spite of the weekend having a late start (flooding "down South" severely disrupted train and road travel, meaning it took a loooong time to get home from London), I've managed to complete most of the work on the new Morabaraba control. Here's what it has:


Some New Morabaraba Development

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New AHEM Board: New default theme for AHEMNew AHEM Board: New default theme for AHEM

It's been a while since I made any progress on my Morabaraba software suite. The last release was made on 14 April, and I haven't done much work on it since then. The reason is partly due to the fact that I have been stupefyingly busy, and partly because I've reached a point where I have a few Big Ideas which need quite a lot of work to come to fruition - enough to put me off.


AHEM: What Next?

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With the 0.6 release out the door, AHEM is now a very capable Morabaraba engine, and is also reasonably usable. I now need to consider what to do next. There are three categories of endeavour:

Engine Enhancements

Improve the playing strength - there are still lots of possibilities to consider:

  • Fine-tune evaluation weightings (which are a bit arbitrary at the moment) - would require some kind of automatic playoff tool to verify improvements
  • Build an opening book using drop-out expansion - I think this would probably improve the quality of the first few moves significantly, given a few months' calculation
  • Enhance the search using something like PVS
  • Knowledge improvements would probably help significantly, but I really need some input from expert players

GUI Enhancements


AHEM v0.6 Shaping Up

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Over the Easter weekend, I've had some more time to put into AHEM (Adam's Happy Electronic Morabaraba), and it's shaping up nicely. I've made some serious improvements to the engine, including:

  • improved quiescence
  • transposition tables
  • killer heuristic
  • null-move proving
  • knowledge enhancements
  • Used the Intel C Compiler to build the DLL which ships with the GUI - this on its own brings a significant speed boost

Also a key bugfix which was impairing the search in key positions. All in all, the current unreleased code makes AHEM 0.5 look like a beginner, performing deeper, faster and smarter searches. I was planning on adding a bunch of UI features for release 0.6 but I'm tempted to just bundle up these engine enhancements and ship it - the engine is really beginning to look strong, like something that might actually not be embarrassed by competition!


AHEM 0.5 Prerelease

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Excited by progress on the new Lazarus-based GUI, I've decided to make a prerelease of AHEM version 0.5 so that all of those who've been waiting for the new GUI can take a peek. You can download the Windows prerelease here - just unzip the files and run ahemgui.exe. The following items still remain before 0.5 is officially released:

  • Implementation of the "machine gunning" rule
  • Visual representation of cows in hand during first phase (slightly irritating in the prerelease)
  • Selection of skill levels in the GUI
  • Engine shared library and GUI binaries for Linux

The prerelease already contains the best Morabaraba engine I've ever released. This version can also be compiled (without any source code changes) by GCC, MSVC and the Intel C Compiler, increasing performance and removing the Cygwin dependency.


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