Added image validator

framework/yii/validators/ImageValidator.php

+<?php
+/**
+ * Image validator class file.
+ *
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\validators;
+
+use Yii;
+use yii\web\UploadedFile;
+use yii\helpers\FileHelper;
+
+/**
+ * ImageValidator verifies if an attribute is receiving a valid image.
+ *
+ * @author Taras Gudz <gudz.taras@gmail.com>
+ * @since 2.0
+ */
+class ImageValidator extends FileValidator
+{
+	/**
+	 * @var string the error message used when the uploaded file is not an image.
+	 * You may use the following tokens in the message:
+	 *
+	 * - {attribute}: the attribute name
+	 * - {file}: the uploaded file name
+	 */
+	public $notImage;
+	/**
+	 * @var integer the minimum width in pixels.
+	 * Defaults to null, meaning no limit.
+	 * @see underWidth
+	 */
+	public $minWidth;
+	/**
+	 * @var integer the maximum width in pixels.
+	 * Defaults to null, meaning no limit.
+	 * @see overWidth
+	 */
+	public $maxWidth;
+	/**
+	 * @var integer the minimum height in pixels.
+	 * Defaults to null, meaning no limit.
+	 * @see underHeight
+	 */
+	public $minHeight;
+	/**
+	 * @var integer the maximum width in pixels.
+	 * Defaults to null, meaning no limit.
+	 * @see overWidth
+	 */
+	public $maxHeight;
+	/**
+	 * @var array|string a list of file mime types that are allowed to be uploaded.
+	 * This can be either an array or a string consisting of file mime types
+	 * separated by space or comma (e.g. "image/jpeg, image/png").
+	 * Mime type names are case-insensitive. Defaults to null, meaning all mime types
+	 * are allowed.
+	 * @see wrongMimeType
+	 */
+	public $mimeTypes;
+	/**
+	 * @var string the error message used when the image is under [[minWidth]].
+	 * You may use the following tokens in the message:
+	 *
+	 * - {attribute}: the attribute name
+	 * - {file}: the uploaded file name
+	 * - {limit}: the value of [[minWidth]]
+	 */
+	public $underWidth;
+	/**
+	 * @var string the error message used when the image is over [[maxWidth]].
+	 * You may use the following tokens in the message:
+	 *
+	 * - {attribute}: the attribute name
+	 * - {file}: the uploaded file name
+	 * - {limit}: the value of [[maxWidth]]
+	 */
+	public $overWidth;
+	/**
+	 * @var string the error message used when the image is under [[minHeight]].
+	 * You may use the following tokens in the message:
+	 *
+	 * - {attribute}: the attribute name
+	 * - {file}: the uploaded file name
+	 * - {limit}: the value of [[minHeight]]
+	 */
+	public $underHeight;
+	/**
+	 * @var string the error message used when the image is over [[maxHeight]].
+	 * You may use the following tokens in the message:
+	 *
+	 * - {attribute}: the attribute name
+	 * - {file}: the uploaded file name
+	 * - {limit}: the value of [[maxHeight]]
+	 */
+	public $overHeight;
+	/**
+	 * @var string the error message used when the file has an mime type
+	 * that is not listed in [[mimeTypes]].
+	 * You may use the following tokens in the message:
+	 *
+	 * - {attribute}: the attribute name
+	 * - {file}: the uploaded file name
+	 * - {mimeTypes}: the value of [[mimeTypes]]
+	 */
+	public $wrongMimeType;
+
+	/**
+	 * Initializes the validator.
+	 */
+	public function init()
+	{
+		parent::init();
+		
+		if ($this->notImage === null) {
+			$this->notImage = Yii::t('yii', 'The file "{file}" is not an image.');
+		}
+		if ($this->underWidth === null) {
+			$this->underWidth = Yii::t('yii', 'The file "{file}" is too small. The width cannot be smaller than {limit} pixels.');
+		}
+		if ($this->underHeight === null) {
+			$this->underHeight = Yii::t('yii', 'The file "{file}" is too small. The height cannot be smaller than {limit} px.');
+		}		
+		if ($this->overWidth === null) {
+			$this->overWidth = Yii::t('yii', 'The file "{file}" is too large. The width cannot be larger than {limit} px.');
+		}
+		if ($this->overHeight === null) {
+			$this->overHeight = Yii::t('yii', 'The file "{file}" is too large. The height cannot be larger than {limit} px.');
+		}
+		if ($this->wrongMimeType === null) {
+			$this->wrongMimeType = Yii::t('yii', 'Only files with these mimeTypes are allowed: {mimeTypes}.');
+		}
+		if (!is_array($this->mimeTypes)) {
+			$this->mimeTypes = preg_split('/[\s,]+/', strtolower($this->mimeTypes), -1, PREG_SPLIT_NO_EMPTY);
+		}
+	}
+
+	/**
+	 * Validates the attribute of the object using {@link validateImage}.
+	 * If there is any error, the error message is added to the object.
+	 * @param \yii\base\Model $object the object being validated
+	 * @param string $attribute the attribute being validated
+	 */
+	public function validateAttribute($object, $attribute)
+	{
+		parent::validateAttribute($object, $attribute);
+		
+		if ($object->hasErrors()) {
+			return;
+		}
+		
+		if ($this->maxFiles > 1) {
+			$files = $object->$attribute;
+			$object->$attribute = array_values($files);
+			
+			foreach ($files as $file) {
+				$this->validateImage($object, $attribute, $file);
+			}
+		} else {
+			$file = $object->$attribute;
+			$this->validateImage($object, $attribute, $file);
+		}
+	}
+	
+	/**
+	 * Internally validates a file object.
+	 * @param \yii\base\Model $object the object being validated
+	 * @param string $attribute the attribute being validated
+	 * @param UploadedFile $image uploaded file passed to check against a set of rules
+	 */
+	public function validateImage($object, $attribute, $image)
+	{
+		if (!empty($this->mimeTypes) && !in_array(FileHelper::getMimeType($image->tempName), $this->mimeTypes, true)) {
+			$this->addError($object, $attribute, $this->wrongMimeType, ['file' => $image->name, 'mimeTypes' => implode(', ', $this->mimeTypes)]);
+		}
+		
+		if (false === ($imageInfo = getimagesize($image->tempName))) {
+			$this->addError($object, $attribute, $this->notImage, ['file' => $image->name]);
+			return;
+		}
+		
+		list($width, $height, $type) = $imageInfo;
+		
+		if ($width == 0 || $height == 0) {
+			$this->addError($object, $attribute, $this->notImage, ['file' => $image->name]);
+			return;
+		}
+		
+		if ($this->minWidth !== null && $width < $this->minWidth) {
+			$this->addError($object, $attribute, $this->underWidth, ['file' => $image->name, 'limit' => $this->minWidth]);
+		}
+		
+		if ($this->minHeight !== null && $height < $this->minHeight) {
+			$this->addError($object, $attribute, $this->underHeight, ['file' => $image->name, 'limit' => $this->minHeight]);
+		}
+		
+		if ($this->maxWidth !== null && $width > $this->maxWidth) {
+			$this->addError($object, $attribute, $this->overWidth, ['file' => $image->name, 'limit' => $this->maxWidth]);
+		}
+		
+		if ($this->maxHeight !== null && $height > $this->maxHeight) {
+			$this->addError($object, $attribute, $this->overHeight, ['file' => $image->name, 'limit' => $this->maxHeight]);
+		}
+	}
+}

framework/yii/validators/Validator.php

@@ -31,6 +31,7 @@ use yii\base\NotSupportedException;
  * - `exist`: [[ExistValidator]]
  * - `file`: [[FileValidator]]
  * - `filter`: [[FilterValidator]]
+ * - `image`: [[ImageValidator]]
  * - `in`: [[RangeValidator]]
  * - `integer`: [[NumberValidator]]
  * - `match`: [[RegularExpressionValidator]]
@@ -59,6 +60,7 @@ abstract class Validator extends Component
 		'exist' => 'yii\validators\ExistValidator',
 		'file' => 'yii\validators\FileValidator',
 		'filter' => 'yii\validators\FilterValidator',
+		'image' => 'yii\validators\ImageValidator',
 		'in' => 'yii\validators\RangeValidator',
 		'integer' => [
 			'class' => 'yii\validators\NumberValidator',