13 files changed, 321 insertions, 0 deletions
diff --git a/mod/captcha/backgrounds/bg1.jpg b/mod/captcha/backgrounds/bg1.jpg
new file mode 100644
index 000000000..0e16b2265
--- /dev/null
+++ b/mod/captcha/backgrounds/bg1.jpg
diff --git a/mod/captcha/backgrounds/bg2.jpg b/mod/captcha/backgrounds/bg2.jpg
new file mode 100644
index 000000000..3357164a6
--- /dev/null
+++ b/mod/captcha/backgrounds/bg2.jpg
diff --git a/mod/captcha/backgrounds/bg3.jpg b/mod/captcha/backgrounds/bg3.jpg
new file mode 100644
index 000000000..96610abf4
--- /dev/null
+++ b/mod/captcha/backgrounds/bg3.jpg
diff --git a/mod/captcha/backgrounds/bg4.jpg b/mod/captcha/backgrounds/bg4.jpg
new file mode 100644
index 000000000..5123ed70e
--- /dev/null
+++ b/mod/captcha/backgrounds/bg4.jpg
diff --git a/mod/captcha/backgrounds/bg5.jpg b/mod/captcha/backgrounds/bg5.jpg
new file mode 100644
index 000000000..7ae7e6c22
--- /dev/null
+++ b/mod/captcha/backgrounds/bg5.jpg
diff --git a/mod/captcha/captcha.php b/mod/captcha/captcha.php
new file mode 100644
index 000000000..0947940ec
--- /dev/null
+++ b/mod/captcha/captcha.php
@@ -0,0 +1,41 @@
+<?php
+	/**
+	 * Elgg captcha plugin graphics file generator
+	 * 
+	 * @package ElggCaptcha
+	 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
+	 * @author Curverider Ltd
+	 * @copyright Curverider Ltd 2008-2010
+	 * @link http://elgg.com/
+	 */
+
+	global $CONFIG;
+	$token = get_input('captcha_token');
+
+	// 	Output captcha
+	if ($token)
+	{ 
+		// Set correct header
+		header("Content-type: image/jpeg");
+	
+		// Generate captcha
+		$captcha = captcha_generate_captcha($token);
+		
+		// Pick a random background image
+		$n = rand(1, $CONFIG->captcha_num_bg);
+		$image = imagecreatefromjpeg($CONFIG->pluginspath . "captcha/backgrounds/bg$n.jpg");	
+		
+		// Create a colour (black so its not a simple matter of masking out one colour and ocring the rest)
+		$colour = imagecolorallocate($image, 0,0,0);
+		
+		// Write captcha to image
+		//imagestring($image, 5, 30, 4, $captcha, $black);
+		imagettftext($image, 30, 0, 10, 30, $colour, $CONFIG->pluginspath . "captcha/fonts/1.ttf", $captcha);
+		
+		// Output image
+		imagejpeg($image);
+		
+		// Free memory
+		imagedestroy($image);
+	}
+?>
+\ No newline at end of file
diff --git a/mod/captcha/fonts/1.ttf b/mod/captcha/fonts/1.ttf
new file mode 100644
index 000000000..f5534f943
--- /dev/null
+++ b/mod/captcha/fonts/1.ttf
diff --git a/mod/captcha/fonts/Liberation_serif_License.txt b/mod/captcha/fonts/Liberation_serif_License.txt
new file mode 100644
index 000000000..41751f278
--- /dev/null
+++ b/mod/captcha/fonts/Liberation_serif_License.txt
@@ -0,0 +1,77 @@
+LICENSE AGREEMENT AND LIMITED PRODUCT WARRANTY LIBERATION FONT SOFTWARE
+This agreement governs the use of the Software and any updates to the
+Software, regardless of the delivery mechanism. Subject to the following
+terms, Red Hat, Inc. ("Red Hat") grants to the user ("Client") a license to
+this collective work pursuant to the GNU General Public License v.2 with the
+exceptions set forth below and such other terms as our set forth in this End
+User License Agreement.
+1. The Software and License Exception. LIBERATION font software  (the
+"Software") consists of TrueType-OpenType formatted font software for
+rendering LIBERATION typefaces in sans serif, serif, and monospaced character
+styles. You are licensed to use, modify, copy, and distribute the Software
+pursuant to the GNU General Public License v.2 with the following exceptions:  
+1) As a special exception, if you create a document which uses this font, and
+embed this font or unaltered portions of this font into the document, this
+font does not by itself cause the resulting document to be covered by the GNU
+General Public License.  This exception does not however invalidate any other
+reasons why the document might be covered by the GNU General Public License. 
+If you modify this font, you may extend this exception to your version of the
+font, but you are not obligated to do so. If you do not wish to do so, delete
+this exception statement from your version. 
+
+2) As a further exception, any distribution of the object code of the Software
+in a physical product must provide you the right to access and modify the
+source code for the Software and to reinstall that modified version of the
+Software in object code form on the same physical product on which you
+received it.
+2. Intellectual Property Rights. The Software and each of its components,
+including the source code, documentation, appearance, structure and
+organization are owned by Red Hat and others and are protected under copyright
+and other laws. Title to the Software and any component, or to any copy,
+modification, or merged portion shall remain with the aforementioned, subject
+to the applicable license. The "LIBERATION" trademark is a trademark of Red
+Hat, Inc. in the U.S. and other countries. This agreement does not permit
+Client to distribute modified versions of the Software using Red Hat's
+trademarks. If Client makes a redistribution of a modified version of the
+Software, then Client must modify the files names to remove any reference to
+the Red Hat trademarks and must not use the Red Hat trademarks in any way to
+reference or promote the modified Software. 
+3. Limited Warranty. To the maximum extent permitted under applicable law, the
+Software is provided and licensed "as is" without warranty of any kind,
+expressed or implied, including the implied warranties of merchantability,
+non-infringement or fitness for a particular purpose. Red Hat does not warrant
+that the functions contained in the Software will meet Client's requirements
+or that the operation of the Software will be entirely error free or appear
+precisely as described in the accompanying documentation. 
+4. Limitation of Remedies and Liability.  To the maximum extent permitted by
+applicable law, Red Hat or any Red Hat authorized dealer will not be liable to
+Client for any incidental or consequential damages, including lost profits or
+lost savings arising out of the use or inability to use the Software, even if
+Red Hat or such dealer has been advised of the possibility of such damages. 
+5. Export Control. As required by U.S. law, Client represents and warrants
+that it: (a) understands that the Software is subject to export controls under
+the U.S. Commerce Department's Export Administration Regulations ("EAR"); (b)
+is not located in a prohibited destination country under the EAR or U.S.
+sanctions regulations (currently Cuba, Iran, Iraq, Libya, North Korea, Sudan
+and Syria); (c) will not export, re-export, or transfer the Software to any
+prohibited destination, entity, or individual without the necessary export
+license(s) or authorizations(s) from the U.S. Government; (d) will not use or
+transfer the Software for use in any sensitive nuclear, chemical or biological
+weapons, or missile technology end-uses unless authorized by the U.S.
+Government by regulation or specific license; (e) understands and agrees that
+if it is in the United States and exports or transfers the Software to
+eligible end users, it will, as required by EAR Section 740.17(e), submit
+semi-annual reports to the Commerce Department's Bureau of Industry & Security
+(BIS), which include the name and address (including country) of each
+transferee; and (f) understands that countries other than the United States
+may restrict the import, use, or export of encryption products and that it
+shall be solely responsible for compliance with any such import, use, or
+export restrictions.
+6. General. If any provision of this agreement is held to be unenforceable,
+that shall not affect the enforceability of the remaining provisions. This
+agreement shall be governed by the laws of the State of North Carolina and of
+the United States, without regard to any conflict of laws provisions, except
+that the United Nations Convention on the International Sale of Goods shall
+not apply.
+Copyright © 2007 Red Hat, Inc. All rights reserved. LIBERATION is a trademark
+of Red Hat, Inc.
diff --git a/mod/captcha/languages/en.php b/mod/captcha/languages/en.php
new file mode 100644
index 000000000..a45515ce3
--- /dev/null
+++ b/mod/captcha/languages/en.php
@@ -0,0 +1,20 @@
+<?php
+	/**
+	 * Elgg diagnostics language pack.
+	 * 
+	 * @package ElggDiagnostics
+	 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
+	 * @author Curverider Ltd
+	 * @copyright Curverider Ltd 2008-2010
+	 * @link http://elgg.com/
+	 */
+
+	$english = array(
+	
+		'captcha:entercaptcha' => 'Enter text from image',
+		'captcha:captchafail' => 'Sorry, the text that you entered didn\'t match the text in the image.',
+	
+	);
+					
+	add_translation("en",$english);
+?>
+\ No newline at end of file
diff --git a/mod/captcha/manifest.xml b/mod/captcha/manifest.xml
new file mode 100644
index 000000000..ef8b66775
--- /dev/null
+++ b/mod/captcha/manifest.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<plugin_manifest>
+	<field key="author" value="Curverider Ltd" />
+	<field key="version" value="1.7" />
+	<field key="description" value="Provides captcha support (Requires the php_gd library)." />
+	<field key="website" value="http://www.elgg.org/" />
+	<field key="copyright" value="(C) Curverider 2008-2010" />
+	<field key="licence" value="GNU Public License version 2" />
+	<field key="elgg_version" value="2010030101" />
+</plugin_manifest>
diff --git a/mod/captcha/start.php b/mod/captcha/start.php
new file mode 100644
index 000000000..9c76ce738
--- /dev/null
+++ b/mod/captcha/start.php
@@ -0,0 +1,141 @@
+<?php
+	/**
+	 * Elgg captcha plugin
+	 * 
+	 * @package ElggCaptcha
+	 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
+	 * @author Curverider Ltd
+	 * @copyright Curverider Ltd 2008-2010
+	 * @link http://elgg.com/
+	 */
+
+	function captcha_init()
+	{
+		global $CONFIG;
+		
+		// Register page handler for captcha functionality
+		register_page_handler('captcha','captcha_page_handler');
+		
+		// Extend CSS
+		elgg_extend_view('css','captcha/css');
+		
+		// Number of background images
+		$CONFIG->captcha_num_bg = 5;
+		
+		// Default length
+		$CONFIG->captcha_length = 5;
+		
+		// Register a function that provides some default override actions
+		register_plugin_hook('actionlist', 'captcha', 'captcha_actionlist_hook');
+		
+		// Register actions to intercept
+		$actions = array();
+		$actions = trigger_plugin_hook('actionlist', 'captcha', null, $actions);
+		
+		if (($actions) && (is_array($actions)))
+		{
+			foreach ($actions as $action)
+				register_plugin_hook("action", $action, "captcha_verify_action_hook");
+		}
+	}
+	
+	function captcha_page_handler($page) 
+	{
+		global $CONFIG;
+		
+		if (isset($page[0])) {
+			set_input('captcha_token',$page[0]);
+		}
+
+		include($CONFIG->pluginspath . "captcha/captcha.php");
+	}
+	
+	/**
+	 * Generate a token to act as a seed value for the captcha algorithm.
+	 */
+	function captcha_generate_token()
+	{
+		return md5(generate_action_token(time()).rand()); // Use action token plus some random for uniqueness
+	}
+	
+	/**
+	 * Generate a captcha based on the given seed value and length.
+	 *
+	 * @param string $seed_token
+	 * @return string
+	 */
+	function captcha_generate_captcha($seed_token)
+	{
+		global $CONFIG;
+		
+		/*
+		 * We generate a token out of the random seed value + some session data, 
+		 * this means that solving via pr0n site or indian cube farm becomes
+		 * significantly more tricky (we hope).
+		 * 
+		 * We also add the site secret, which is unavailable to the client and so should
+		 * make it very very hard to guess values before hand.
+		 * 
+		 */
+		
+		return strtolower(substr(md5(generate_action_token(0) . $seed_token), 0, $CONFIG->captcha_length));
+	}
+	
+	/**
+	 * Verify a captcha based on the input value entered by the user and the seed token passed.
+	 *
+	 * @param string $input_value
+	 * @param string $seed_token
+	 * @return bool
+	 */
+	function captcha_verify_captcha($input_value, $seed_token)
+	{
+		if (strcasecmp($input_value, captcha_generate_captcha($seed_token)) == 0)
+			return true;
+			
+		return false;
+	}
+	
+	/**
+	 * Listen to the action plugin hook and check the captcha.
+	 *
+	 * @param unknown_type $hook
+	 * @param unknown_type $entity_type
+	 * @param unknown_type $returnvalue
+	 * @param unknown_type $params
+	 */
+	function captcha_verify_action_hook($hook, $entity_type, $returnvalue, $params)
+	{
+		$token = get_input('captcha_token');
+		$input = get_input('captcha_input');
+		
+		if (($token) && (captcha_verify_captcha($input, $token)))
+			return true;
+		
+		register_error(elgg_echo('captcha:captchafail'));
+			
+		return false;
+	}
+	
+	/**
+	 * This function returns an array of actions the captcha will expect a captcha for, other plugins may
+	 * add their own to this list thereby extending the use.
+	 *
+	 * @param unknown_type $hook
+	 * @param unknown_type $entity_type
+	 * @param unknown_type $returnvalue
+	 * @param unknown_type $params
+	 */
+	function captcha_actionlist_hook($hook, $entity_type, $returnvalue, $params)
+	{
+		if (!is_array($returnvalue))
+			$returnvalue = array();
+			
+		$returnvalue[] = 'register';
+		$returnvalue[] = 'user/requestnewpassword';
+			
+		return $returnvalue;
+	}
+	
+	register_elgg_event_handler('init','system','captcha_init');
+?>
+\ No newline at end of file
diff --git a/mod/captcha/views/default/captcha/css.php b/mod/captcha/views/default/captcha/css.php
new file mode 100644
index 000000000..7466cbb24
--- /dev/null
+++ b/mod/captcha/views/default/captcha/css.php
@@ -0,0 +1,6 @@
+
+.captcha-input-image {
+	text-align: center;
+	margin: auto;
+}
+
diff --git a/mod/captcha/views/default/input/captcha.php b/mod/captcha/views/default/input/captcha.php
new file mode 100644
index 000000000..879a01c2d
--- /dev/null
+++ b/mod/captcha/views/default/input/captcha.php
@@ -0,0 +1,26 @@
+<?php
+	/**
+	 * Elgg captcha plugin captcha hook view override.
+	 * 
+	 * @package ElggCaptcha
+	 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
+	 * @author Curverider Ltd
+	 * @copyright Curverider Ltd 2008-2010
+	 * @link http://elgg.com/
+	 */
+
+	// Generate a token which is then passed into the captcha algorithm for verification
+	$token = captcha_generate_token();
+?>
+<div class="captcha">
+	<input type="hidden" name="captcha_token" value="<?php echo $token; ?>" />
+	<label>
+		<?php echo elgg_echo('captcha:entercaptcha'); ?><br /><br />
+		<div class="captcha-right">
+			<img class="captcha-input-image" src="<?php echo $vars['url'] . "pg/captcha/$token"; ?>" /><br />
+		</div><br />
+		<div class="captcha-left">
+			<?php echo elgg_view('input/text', array('internalname' => 'captcha_input', 'class' => 'captcha-input-text')); ?>
+		</div>
+	</label>
+</div>
+\ No newline at end of file