add minimum and maximum amount of pixels to Image validator

src/Symfony/Component/Validator/CHANGELOG.md

@@ -8,6 +8,7 @@ CHANGELOG
    deprecated and will throw an exception in Symfony 4.0
  * setting the `checkDNS` option of the `Url` constraint to `true` is deprecated in favor of
    the `Url::CHECK_DNS_TYPE_*` constants values and will throw an exception in Symfony 4.0
+ * added min/max amount of pixels check to `Image` constraint via `minPixels` and `maxPixels`
 
 3.3.0
 -----

src/Symfony/Component/Validator/Constraints/Image.php

@@ -25,6 +25,8 @@ class Image extends File
     const TOO_NARROW_ERROR = '9afbd561-4f90-4a27-be62-1780fc43604a';
     const TOO_HIGH_ERROR = '7efae81c-4877-47ba-aa65-d01ccb0d4645';
     const TOO_LOW_ERROR = 'aef0cb6a-c07f-4894-bc08-1781420d7b4c';
+    const TOO_FEW_PIXEL_ERROR = '1b06b97d-ae48-474e-978f-038a74854c43';
+    const TOO_MANY_PIXEL_ERROR = 'ee0804e8-44db-4eac-9775-be91aaf72ce1';
     const RATIO_TOO_BIG_ERROR = '70cafca6-168f-41c9-8c8c-4e47a52be643';
     const RATIO_TOO_SMALL_ERROR = '59b8c6ef-bcf2-4ceb-afff-4642ed92f12e';
     const SQUARE_NOT_ALLOWED_ERROR = '5d41425b-facb-47f7-a55a-de9fbe45cb46';
@@ -45,6 +47,8 @@ class Image extends File
         self::TOO_NARROW_ERROR => 'TOO_NARROW_ERROR',
         self::TOO_HIGH_ERROR => 'TOO_HIGH_ERROR',
         self::TOO_LOW_ERROR => 'TOO_LOW_ERROR',
+        self::TOO_FEW_PIXEL_ERROR => 'TOO_FEW_PIXEL_ERROR',
+        self::TOO_MANY_PIXEL_ERROR => 'TOO_MANY_PIXEL_ERROR',
         self::RATIO_TOO_BIG_ERROR => 'RATIO_TOO_BIG_ERROR',
         self::RATIO_TOO_SMALL_ERROR => 'RATIO_TOO_SMALL_ERROR',
         self::SQUARE_NOT_ALLOWED_ERROR => 'SQUARE_NOT_ALLOWED_ERROR',
@@ -60,6 +64,8 @@ class Image extends File
     public $minHeight;
     public $maxRatio;
     public $minRatio;
+    public $minPixels;
+    public $maxPixels;
     public $allowSquare = true;
     public $allowLandscape = true;
     public $allowPortrait = true;
@@ -72,6 +78,8 @@ class Image extends File
     public $minWidthMessage = 'The image width is too small ({{ width }}px). Minimum width expected is {{ min_width }}px.';
     public $maxHeightMessage = 'The image height is too big ({{ height }}px). Allowed maximum height is {{ max_height }}px.';
     public $minHeightMessage = 'The image height is too small ({{ height }}px). Minimum height expected is {{ min_height }}px.';
+    public $minPixelsMessage = 'The image has too few pixels ({{ pixels }} pixels). Minimum amount expected is {{ min_pixels }} pixels.';
+    public $maxPixelsMessage = 'The image has too many pixels ({{ pixels }} pixels). Maximum amount expected is {{ max_pixels }} pixels.';
     public $maxRatioMessage = 'The image ratio is too big ({{ ratio }}). Allowed maximum ratio is {{ max_ratio }}.';
     public $minRatioMessage = 'The image ratio is too small ({{ ratio }}). Minimum ratio expected is {{ min_ratio }}.';
     public $allowSquareMessage = 'The image is square ({{ width }}x{{ height }}px). Square images are not allowed.';

src/Symfony/Component/Validator/Constraints/ImageValidator.php

@@ -46,6 +46,7 @@ class ImageValidator extends FileValidator
 
         if (null === $constraint->minWidth && null === $constraint->maxWidth
             && null === $constraint->minHeight && null === $constraint->maxHeight
+            && null === $constraint->minPixels && null === $constraint->maxPixels
             && null === $constraint->minRatio && null === $constraint->maxRatio
             && $constraint->allowSquare && $constraint->allowLandscape && $constraint->allowPortrait
             && !$constraint->detectCorrupted) {
@@ -127,6 +128,40 @@ class ImageValidator extends FileValidator
             }
         }
 
+        $pixels = $width * $height;
+
+        if (null !== $constraint->minPixels) {
+            if (!ctype_digit((string) $constraint->minPixels)) {
+                throw new ConstraintDefinitionException(sprintf('"%s" is not a valid minimum amount of pixels', $constraint->minPixels));
+            }
+
+            if ($pixels < $constraint->minPixels) {
+                $this->context->buildViolation($constraint->minPixelsMessage)
+                    ->setParameter('{{ pixels }}', $pixels)
+                    ->setParameter('{{ min_pixels }}', $constraint->minPixels)
+                    ->setParameter('{{ height }}', $height)
+                    ->setParameter('{{ width }}', $width)
+                    ->setCode(Image::TOO_FEW_PIXEL_ERROR)
+                    ->addViolation();
+            }
+        }
+
+        if (null !== $constraint->maxPixels) {
+            if (!ctype_digit((string) $constraint->maxPixels)) {
+                throw new ConstraintDefinitionException(sprintf('"%s" is not a valid maximum amount of pixels', $constraint->maxPixels));
+            }
+
+            if ($pixels > $constraint->maxPixels) {
+                $this->context->buildViolation($constraint->maxPixelsMessage)
+                    ->setParameter('{{ pixels }}', $pixels)
+                    ->setParameter('{{ max_pixels }}', $constraint->maxPixels)
+                    ->setParameter('{{ height }}', $height)
+                    ->setParameter('{{ width }}', $width)
+                    ->setCode(Image::TOO_MANY_PIXEL_ERROR)
+                    ->addViolation();
+            }
+        }
+
         $ratio = round($width / $height, 2);
 
         if (null !== $constraint->minRatio) {

src/Symfony/Component/Validator/Tests/Constraints/ImageValidatorTest.php

@@ -164,6 +164,42 @@ class ImageValidatorTest extends ConstraintValidatorTestCase
             ->assertRaised();
     }
 
+    public function testPixelsTooFew()
+    {
+        $constraint = new Image(array(
+            'minPixels' => 5,
+            'minPixelsMessage' => 'myMessage',
+        ));
+
+        $this->validator->validate($this->image, $constraint);
+
+        $this->buildViolation('myMessage')
+            ->setParameter('{{ pixels }}', '4')
+            ->setParameter('{{ min_pixels }}', '5')
+            ->setParameter('{{ height }}', '2')
+            ->setParameter('{{ width }}', '2')
+            ->setCode(Image::TOO_FEW_PIXEL_ERROR)
+            ->assertRaised();
+    }
+
+    public function testPixelsTooMany()
+    {
+        $constraint = new Image(array(
+            'maxPixels' => 3,
+            'maxPixelsMessage' => 'myMessage',
+        ));
+
+        $this->validator->validate($this->image, $constraint);
+
+        $this->buildViolation('myMessage')
+            ->setParameter('{{ pixels }}', '4')
+            ->setParameter('{{ max_pixels }}', '3')
+            ->setParameter('{{ height }}', '2')
+            ->setParameter('{{ width }}', '2')
+            ->setCode(Image::TOO_MANY_PIXEL_ERROR)
+            ->assertRaised();
+    }
+
     /**
      * @expectedException \Symfony\Component\Validator\Exception\ConstraintDefinitionException
      */
@@ -212,6 +248,30 @@ class ImageValidatorTest extends ConstraintValidatorTestCase
         $this->validator->validate($this->image, $constraint);
     }
 
+    /**
+     * @expectedException \Symfony\Component\Validator\Exception\ConstraintDefinitionException
+     */
+    public function testInvalidMinPixels()
+    {
+        $constraint = new Image(array(
+            'minPixels' => '1abc',
+        ));
+
+        $this->validator->validate($this->image, $constraint);
+    }
+
+    /**
+     * @expectedException \Symfony\Component\Validator\Exception\ConstraintDefinitionException
+     */
+    public function testInvalidMaxPixels()
+    {
+        $constraint = new Image(array(
+            'maxPixels' => '1abc',
+        ));
+
+        $this->validator->validate($this->image, $constraint);
+    }
+
     public function testRatioTooSmall()
     {
         $constraint = new Image(array(