Fixes issue #49: finished CAPTCHA feature.

apps/bootstrap/protected/controllers/SiteController.php

@@ -6,6 +6,15 @@ use app\models\ContactForm;
 
 class SiteController extends Controller
 {
+	public function actions()
+	{
+		return array(
+			'captcha' => array(
+				'class' => 'yii\web\CaptchaAction',
+			),
+		);
+	}
+
 	public function actionIndex()
 	{
 		echo $this->render('index');

apps/bootstrap/protected/models/ContactForm.php

@@ -26,7 +26,7 @@ class ContactForm extends Model
 			// email has to be a valid email address
 			array('email', 'email'),
 			// verifyCode needs to be entered correctly
-			//array('verifyCode', 'captcha', 'allowEmpty' => !Captcha::checkRequirements()),
+			array('verifyCode', 'captcha'),
 		);
 	}
 

apps/bootstrap/protected/views/site/contact.php

 <?php
 use yii\helpers\Html;
 use yii\widgets\ActiveForm;
+use yii\widgets\Captcha;
 
 /**
  * @var yii\base\View $this
@@ -30,6 +31,15 @@ $this->params['breadcrumbs'][] = $this->title;
 	<?php echo $form->field($model, 'email')->textInput(); ?>
 	<?php echo $form->field($model, 'subject')->textInput(); ?>
 	<?php echo $form->field($model, 'body')->textArea(array('rows' => 6)); ?>
+	<?php
+		$field = $form->field($model, 'verifyCode');
+		echo $field->begin();
+		echo $field->label();
+		$this->widget(Captcha::className());
+		echo Html::activeTextInput($model, 'verifyCode', array('class' => 'input-medium'));
+		echo $field->error();
+		echo $field->end();
+	?>
 	<div class="form-actions">
 		<?php echo Html::submitButton('Submit', null, null, array('class' => 'btn btn-primary')); ?>
 	</div>

framework/assets.php

@@ -28,4 +28,11 @@ return array(
 		),
 		'depends' => array('yii', 'yii/validation'),
 	),
+	'yii/captcha' => array(
+		'sourcePath' => __DIR__ . '/assets',
+		'js' => array(
+			'yii.captcha.js',
+		),
+		'depends' => array('yii'),
+	),
 );

framework/assets/yii.activeForm.js

@@ -116,8 +116,8 @@
 			});
 		},
 
-		options: function() {
-			return this.data('yiiActiveForm').settings;
+		data: function() {
+			return this.data('yiiActiveForm');
 		},
 
 		submitForm: function () {

framework/assets/yii.captcha.js

+/**
+ * Yii Captcha widget.
+ *
+ * This is the JavaScript widget used by the yii\widgets\Captcha widget.
+ *
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+(function ($) {
+	$.fn.yiiCaptcha = function (method) {
+		if (methods[method]) {
+			return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
+		} else if (typeof method === 'object' || !method) {
+			return methods.init.apply(this, arguments);
+		} else {
+			$.error('Method ' + method + ' does not exist on jQuery.yiiCaptcha');
+			return false;
+		}
+	};
+
+	var defaults = {
+		refreshUrl: undefined,
+		hashKey: undefined
+	};
+
+	var methods = {
+		init: function (options) {
+			return this.each(function () {
+				var $e = $(this);
+				var settings = $.extend({}, defaults, options || {});
+				$e.data('yiiCaptcha', {
+					settings: settings
+				});
+
+				$e.on('click.yiiCaptcha', function() {
+					methods.refresh.apply($e);
+					return false;
+				});
+
+			});
+		},
+
+		refresh: function () {
+			var $e = this,
+				settings = this.data('yiiCaptcha').settings;
+			$.ajax({
+				url: $e.data('yiiCaptcha').settings.refreshUrl,
+				dataType: 'json',
+				cache: false,
+				success: function(data) {
+					$e.attr('src', data['url']);
+					$('body').data(settings.hashKey, [data['hash1'], data['hash2']]);
+				}
+			});
+		},
+
+		destroy: function () {
+			return this.each(function () {
+				$(window).unbind('.yiiCaptcha');
+				$(this).removeData('yiiCaptcha');
+			});
+		},
+
+		data: function() {
+			return this.data('yiiCaptcha');
+		}
+	};
+})(window.jQuery);
+

framework/validators/CaptchaValidator.php

@@ -21,6 +21,7 @@ use yii\helpers\Html;
  */
 class CaptchaValidator extends Validator
 {
+	public $skipOnEmpty = false;
 	/**
 	 * @var boolean whether the comparison is case sensitive. Defaults to false.
 	 */
@@ -70,7 +71,7 @@ class CaptchaValidator extends Validator
 	/**
 	 * Returns the CAPTCHA action object.
 	 * @throws InvalidConfigException
-	 * @return CaptchaAction the action object
+	 * @return \yii\web\CaptchaAction the action object
 	 */
 	public function getCaptchaAction()
 	{

framework/web/CaptchaAction.php

+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\web;
+
+use Yii;
+use yii\base\Action;
+use yii\base\InvalidConfigException;
+use yii\widgets\Captcha;
+
+/**
+ * CaptchaAction renders a CAPTCHA image.
+ *
+ * CaptchaAction is used together with [[Captcha]] and [[\yii\validators\CaptchaValidator]]
+ * to provide the [CAPTCHA](http://en.wikipedia.org/wiki/Captcha) feature.
+ *
+ * By configuring the properties of CaptchaAction, you may customize the appearance of
+ * the generated CAPTCHA images, such as the font color, the background color, etc.
+ *
+ * Note that CaptchaAction requires either GD2 extension or ImageMagick PHP extension.
+ *
+ * Using CAPTCHA involves the following steps:
+ *
+ * 1. Override [[\yii\web\Controller::actions()]] and register an action of class CaptchaAction with ID 'captcha'
+ * 2. In the form model, declare an attribute to store user-entered verification code, and declare the attribute
+ *    to be validated by the 'captcha' validator.
+ * 3. In the controller view, insert a [[Captcha]] widget in the form.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class CaptchaAction extends Action
+{
+	/**
+	 * The name of the GET parameter indicating whether the CAPTCHA image should be regenerated.
+	 */
+	const REFRESH_GET_VAR = 'refresh';
+	/**
+	 * @var integer how many times should the same CAPTCHA be displayed. Defaults to 3.
+	 * A value less than or equal to 0 means the test is unlimited (available since version 1.1.2).
+	 */
+	public $testLimit = 3;
+	/**
+	 * @var integer the width of the generated CAPTCHA image. Defaults to 120.
+	 */
+	public $width = 120;
+	/**
+	 * @var integer the height of the generated CAPTCHA image. Defaults to 50.
+	 */
+	public $height = 50;
+	/**
+	 * @var integer padding around the text. Defaults to 2.
+	 */
+	public $padding = 2;
+	/**
+	 * @var integer the background color. For example, 0x55FF00.
+	 * Defaults to 0xFFFFFF, meaning white color.
+	 */
+	public $backColor = 0xFFFFFF;
+	/**
+	 * @var integer the font color. For example, 0x55FF00. Defaults to 0x2040A0 (blue color).
+	 */
+	public $foreColor = 0x2040A0;
+	/**
+	 * @var boolean whether to use transparent background. Defaults to false.
+	 */
+	public $transparent = false;
+	/**
+	 * @var integer the minimum length for randomly generated word. Defaults to 6.
+	 */
+	public $minLength = 6;
+	/**
+	 * @var integer the maximum length for randomly generated word. Defaults to 7.
+	 */
+	public $maxLength = 7;
+	/**
+	 * @var integer the offset between characters. Defaults to -2. You can adjust this property
+	 * in order to decrease or increase the readability of the captcha.
+	 **/
+	public $offset = -2;
+	/**
+	 * @var string the TrueType font file. This can be either a file path or path alias.
+	 */
+	public $fontFile = '@yii/web/SpicyRice.ttf';
+	/**
+	 * @var string the fixed verification code. When this is property is set,
+	 * [[getVerifyCode()]] will always return the value of this property.
+	 * This is mainly used in automated tests where we want to be able to reproduce
+	 * the same verification code each time we run the tests.
+	 * If not set, it means the verification code will be randomly generated.
+	 */
+	public $fixedVerifyCode;
+
+
+	/**
+	 * Initializes the action.
+	 * @throws InvalidConfigException if the font file does not exist.
+	 */
+	public function init()
+	{
+		$this->fontFile = Yii::getAlias($this->fontFile);
+		if (!is_file($this->fontFile)) {
+			throw new InvalidConfigException("The font file does not exist: {$this->fontFile}");
+		}
+	}
+
+	/**
+	 * Runs the action.
+	 */
+	public function run()
+	{
+		if (isset($_GET[self::REFRESH_GET_VAR])) {
+			// AJAX request for regenerating code
+			$code = $this->getVerifyCode(true);
+			echo json_encode(array(
+				'hash1' => $this->generateValidationHash($code),
+				'hash2' => $this->generateValidationHash(strtolower($code)),
+				// we add a random 'v' parameter so that FireFox can refresh the image
+				// when src attribute of image tag is changed
+				'url' => $this->controller->createUrl($this->id, array('v' => uniqid())),
+			));
+		} else {
+			$this->renderImage($this->getVerifyCode());
+		}
+		Yii::$app->end();
+	}
+
+	/**
+	 * Generates a hash code that can be used for client side validation.
+	 * @param string $code the CAPTCHA code
+	 * @return string a hash code generated from the CAPTCHA code
+	 */
+	public function generateValidationHash($code)
+	{
+		for ($h = 0, $i = strlen($code) - 1; $i >= 0; --$i) {
+			$h += ord($code[$i]);
+		}
+		return $h;
+	}
+
+	/**
+	 * Gets the verification code.
+	 * @param boolean $regenerate whether the verification code should be regenerated.
+	 * @return string the verification code.
+	 */
+	public function getVerifyCode($regenerate = false)
+	{
+		if ($this->fixedVerifyCode !== null) {
+			return $this->fixedVerifyCode;
+		}
+
+		$session = Yii::$app->session;
+		$session->open();
+		$name = $this->getSessionKey();
+		if ($session[$name] === null || $regenerate) {
+			$session[$name] = $this->generateVerifyCode();
+			$session[$name . 'count'] = 1;
+		}
+		return $session[$name];
+	}
+
+	/**
+	 * Validates the input to see if it matches the generated code.
+	 * @param string $input user input
+	 * @param boolean $caseSensitive whether the comparison should be case-sensitive
+	 * @return boolean whether the input is valid
+	 */
+	public function validate($input, $caseSensitive)
+	{
+		$code = $this->getVerifyCode();
+		$valid = $caseSensitive ? ($input === $code) : strcasecmp($input, $code) === 0;
+		$session = Yii::$app->session;
+		$session->open();
+		$name = $this->getSessionKey() . 'count';
+		$session[$name] = $session[$name] + 1;
+		if ($session[$name] > $this->testLimit && $this->testLimit > 0) {
+			$this->getVerifyCode(true);
+		}
+		return $valid;
+	}
+
+	/**
+	 * Generates a new verification code.
+	 * @return string the generated verification code
+	 */
+	protected function generateVerifyCode()
+	{
+		if ($this->minLength < 3) {
+			$this->minLength = 3;
+		}
+		if ($this->maxLength > 20) {
+			$this->maxLength = 20;
+		}
+		if ($this->minLength > $this->maxLength) {
+			$this->maxLength = $this->minLength;
+		}
+		$length = mt_rand($this->minLength, $this->maxLength);
+
+		$letters = 'bcdfghjklmnpqrstvwxyz';
+		$vowels = 'aeiou';
+		$code = '';
+		for ($i = 0; $i < $length; ++$i) {
+			if ($i % 2 && mt_rand(0, 10) > 2 || !($i % 2) && mt_rand(0, 10) > 9) {
+				$code .= $vowels[mt_rand(0, 4)];
+			} else {
+				$code .= $letters[mt_rand(0, 20)];
+			}
+		}
+
+		return $code;
+	}
+
+	/**
+	 * Returns the session variable name used to store verification code.
+	 * @return string the session variable name
+	 */
+	protected function getSessionKey()
+	{
+		return '__captcha/' . $this->getUniqueId();
+	}
+
+	/**
+	 * Renders the CAPTCHA image.
+	 * @param string $code the verification code
+	 */
+	protected function renderImage($code)
+	{
+		if (Captcha::checkRequirements() === 'gd') {
+			$this->renderImageByGD($code);
+		} else {
+			$this->renderImageByImagick($code);
+		}
+	}
+
+	/**
+	 * Renders the CAPTCHA image based on the code using GD library.
+	 * @param string $code the verification code
+	 */
+	protected function renderImageByGD($code)
+	{
+		$image = imagecreatetruecolor($this->width, $this->height);
+
+		$backColor = imagecolorallocate($image,
+			(int)($this->backColor % 0x1000000 / 0x10000),
+			(int)($this->backColor % 0x10000 / 0x100),
+			$this->backColor % 0x100);
+		imagefilledrectangle($image, 0, 0, $this->width, $this->height, $backColor);
+		imagecolordeallocate($image, $backColor);
+
+		if ($this->transparent) {
+			imagecolortransparent($image, $backColor);
+		}
+
+		$foreColor = imagecolorallocate($image,
+			(int)($this->foreColor % 0x1000000 / 0x10000),
+			(int)($this->foreColor % 0x10000 / 0x100),
+			$this->foreColor % 0x100);
+
+		if ($this->fontFile === null) {
+			$this->fontFile = dirname(__FILE__) . '/SpicyRice.ttf';
+		}
+
+		$length = strlen($code);
+		$box = imagettfbbox(30, 0, $this->fontFile, $code);
+		$w = $box[4] - $box[0] + $this->offset * ($length - 1);
+		$h = $box[1] - $box[5];
+		$scale = min(($this->width - $this->padding * 2) / $w, ($this->height - $this->padding * 2) / $h);
+		$x = 10;
+		$y = round($this->height * 27 / 40);
+		for ($i = 0; $i < $length; ++$i) {
+			$fontSize = (int)(rand(26, 32) * $scale * 0.8);
+			$angle = rand(-10, 10);
+			$letter = $code[$i];
+			$box = imagettftext($image, $fontSize, $angle, $x, $y, $foreColor, $this->fontFile, $letter);
+			$x = $box[2] + $this->offset;
+		}
+
+		imagecolordeallocate($image, $foreColor);
+
+		header('Pragma: public');
+		header('Expires: 0');
+		header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
+		header('Content-Transfer-Encoding: binary');
+		header("Content-type: image/png");
+		imagepng($image);
+		imagedestroy($image);
+	}
+
+	/**
+	 * Renders the CAPTCHA image based on the code using ImageMagick library.
+	 * @param string $code the verification code
+	 */
+	protected function renderImageByImagick($code)
+	{
+		$backColor = $this->transparent ? new \ImagickPixel('transparent') : new \ImagickPixel('#' . dechex($this->backColor));
+		$foreColor = new \ImagickPixel('#' . dechex($this->foreColor));
+
+		$image = new \Imagick();
+		$image->newImage($this->width, $this->height, $backColor);
+
+		if ($this->fontFile === null) {
+			$this->fontFile = dirname(__FILE__) . '/SpicyRice.ttf';
+		}
+
+		$draw = new \ImagickDraw();
+		$draw->setFont($this->fontFile);
+		$draw->setFontSize(30);
+		$fontMetrics = $image->queryFontMetrics($draw, $code);
+
+		$length = strlen($code);
+		$w = (int)($fontMetrics['textWidth']) - 8 + $this->offset * ($length - 1);
+		$h = (int)($fontMetrics['textHeight']) - 8;
+		$scale = min(($this->width - $this->padding * 2) / $w, ($this->height - $this->padding * 2) / $h);
+		$x = 10;
+		$y = round($this->height * 27 / 40);
+		for ($i = 0; $i < $length; ++$i) {
+			$draw = new \ImagickDraw();
+			$draw->setFont($this->fontFile);
+			$draw->setFontSize((int)(rand(26, 32) * $scale * 0.8));
+			$draw->setFillColor($foreColor);
+			$image->annotateImage($draw, $x, $y, rand(-10, 10), $code[$i]);
+			$fontMetrics = $image->queryFontMetrics($draw, $code[$i]);
+			$x += (int)($fontMetrics['textWidth']) + $this->offset;
+		}
+
+		header('Pragma: public');
+		header('Expires: 0');
+		header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
+		header('Content-Transfer-Encoding: binary');
+		header("Content-type: image/png");
+		$image->setImageFormat('png');
+		echo $image;
+	}
+}

framework/web/SpicyRice.md

+## Spicy Rice font
+
+* **Author:** Brian J. Bonislawsky, Astigmatic (AOETI, Astigmatic One Eye Typographic Institute)
+* **License:** SIL Open Font License (OFL), version 1.1, [notes and FAQ](http://scripts.sil.org/OFL)
+
+## Links
+
+* [Astigmatic](http://www.astigmatic.com/)
+* [Google WebFonts](http://www.google.com/webfonts/specimen/Spicy+Rice)
+* [fontsquirrel.com](http://www.fontsquirrel.com/fonts/spicy-rice)
+* [fontspace.com](http://www.fontspace.com/astigmatic-one-eye-typographic-institute/spicy-rice)

framework/widgets/ActiveField.php

@@ -152,7 +152,7 @@ class ActiveField extends Component
 			$options['enableAjaxValidation'] = 1;
 		}
 
-		if ($enableClientValidation || $enableAjaxValidation) {
+		if ($enableClientValidation && !empty($options['validate']) || $enableAjaxValidation) {
 			$inputID = Html::getInputId($this->model, $this->attribute);
 			$options['name'] = $inputID;
 			$names = array(

framework/widgets/Captcha.php

+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\widgets;
+
+use Yii;
+use yii\base\InvalidConfigException;
+use yii\base\Widget;
+use yii\helpers\Html;
+use yii\helpers\Json;
+use yii\web\CaptchaAction;
+
+/**
+ * Captcha renders a CAPTCHA image element.
+ *
+ * Captcha is used together with [[CaptchaAction]] provide [CAPTCHA](http://en.wikipedia.org/wiki/Captcha)
+ * - a way of preventing Website spamming.
+ *
+ * The image element rendered by Captcha will display a CAPTCHA image generated by
+ * an action whose route is specified by [[captchaAction]]. This action must be an instance of [[CaptchaAction]].
+ *
+ * When the user clicks on the CAPTCHA image, it will cause the CAPTCHA image
+ * to be refreshed with a new CAPTCHA.
+ *
+ * You may use [[\yii\validators\CaptchaValidator]] to validate the user input matches
+ * the current CAPTCHA verification code.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class Captcha extends Widget
+{
+	/**
+	 * @var string the route of the action that generates the CAPTCHA images.
+	 * The action represented by this route must be an action of [[CaptchaAction]].
+	 */
+	public $captchaAction = 'site/captcha';
+	/**
+	 * @var array HTML attributes to be applied to the rendered image element.
+	 */
+	public $options = array();
+
+
+	/**
+	 * Renders the widget.
+	 */
+	public function run()
+	{
+		$this->checkRequirements();
+
+		if (!isset($this->options['id'])) {
+			$this->options['id'] = $this->getId();
+		}
+		$id = $this->options['id'];
+		$options = Json::encode($this->getClientOptions());
+		$this->view->registerAssetBundle('yii/captcha');
+		$this->view->registerJs("jQuery('#$id').yiiCaptcha($options);");
+		$url = Yii::$app->getUrlManager()->createUrl($this->captchaAction, array('v' => uniqid()));
+		echo Html::img($url, $this->options);
+	}
+
+	/**
+	 * Returns the options for the captcha JS widget.
+	 * @return array the options
+	 */
+	protected function getClientOptions()
+	{
+		$options = array(
+			'refreshUrl' => Html::url(array($this->captchaAction, CaptchaAction::REFRESH_GET_VAR => 1)),
+			'hashKey' => "yiiCaptcha/{$this->captchaAction}",
+		);
+		return $options;
+	}
+
+	/**
+	 * Checks if there is graphic extension available to generate CAPTCHA images.
+	 * This method will check the existence of ImageMagick and GD extensions.
+	 * @return string the name of the graphic extension, either "imagick" or "gd".
+	 * @throws InvalidConfigException if neither ImageMagick nor GD is installed.
+	 */
+	public static function checkRequirements()
+	{
+		if (extension_loaded('imagick')) {
+			$imagick = new \Imagick();
+			$imagickFormats = $imagick->queryFormats('PNG');
+			if (in_array('PNG', $imagickFormats)) {
+				return 'imagick';
+			}
+		}
+		if (extension_loaded('gd')) {
+			$gdInfo = gd_info();
+			if (!empty($gdInfo['FreeType Support'])) {
+				return 'gd';
+			}
+		}
+		throw new InvalidConfigException('GD with FreeType or ImageMagick PHP extensions are required.');
+	}
+}