Centralize duplicate code

src/Drivers/AbstractDecoder.php

@@ -68,6 +68,33 @@ abstract class AbstractDecoder extends DriverSpecialized implements DecoderInter
         );
     }
 
+    /**
+     * Determine if given input is a path to an existing regular file
+     *
+     * @param mixed $input
+     * @return bool
+     */
+    protected function isFile(mixed $input): bool
+    {
+        if (!is_string($input)) {
+            return false;
+        }
+
+        if (strlen($input) > PHP_MAXPATHLEN) {
+            return false;
+        }
+
+        try {
+            if (!@is_file($input)) {
+                return false;
+            }
+        } catch (Exception) {
+            return false;
+        }
+
+        return true;
+    }
+
     /**
      * Extract and return EXIF data from given input which can be binary image
      * data or a file path.

src/Drivers/Gd/Decoders/FilePathImageDecoder.php

@@ -4,7 +4,6 @@ declare(strict_types=1);
 
 namespace Intervention\Image\Drivers\Gd\Decoders;
 
-use Exception;
 use Intervention\Image\Drivers\Gd\Decoders\Traits\CanDecodeGif;
 use Intervention\Image\Exceptions\DecoderException;
 use Intervention\Image\Interfaces\ColorInterface;
@@ -18,19 +17,7 @@ class FilePathImageDecoder extends GdImageDecoder implements DecoderInterface
 
     public function decode(mixed $input): ImageInterface|ColorInterface
     {
-        if (!is_string($input)) {
+        if (!$this->isFile($input)) {
-            throw new DecoderException('Unable to decode input');
-        }
-
-        if (strlen($input) > PHP_MAXPATHLEN) {
-            throw new DecoderException('Unable to decode input');
-        }
-
-        try {
-            if (!@is_file($input)) {
-                throw new DecoderException('Unable to decode input');
-            }
-        } catch (Exception) {
             throw new DecoderException('Unable to decode input');
         }
 

src/Drivers/Imagick/Decoders/FilePathImageDecoder.php

@@ -4,7 +4,6 @@ declare(strict_types=1);
 
 namespace Intervention\Image\Drivers\Imagick\Decoders;
 
-use Exception;
 use Imagick;
 use ImagickException;
 use Intervention\Image\Exceptions\DecoderException;
@@ -16,19 +15,7 @@ class FilePathImageDecoder extends ImagickImageDecoder implements DecoderInterfa
 {
     public function decode(mixed $input): ImageInterface|ColorInterface
     {
-        if (!is_string($input)) {
+        if (!$this->isFile($input)) {
-            throw new DecoderException('Unable to decode input');
-        }
-
-        if (strlen($input) > PHP_MAXPATHLEN) {
-            throw new DecoderException('Unable to decode input');
-        }
-
-        try {
-            if (!@is_file($input)) {
-                throw new DecoderException('Unable to decode input');
-            }
-        } catch (Exception) {
             throw new DecoderException('Unable to decode input');
         }
 

tests/Unit/Drivers/AbstractDecoderTest.php

@@ -58,6 +58,13 @@ final class AbstractDecoderTest extends BaseTestCase
         $this->assertTrue($decoder->isGifFormat($this->getTestImageData('red.gif')));
     }
 
+    public function testIsFile(): void
+    {
+        $decoder = Mockery::mock(AbstractDecoder::class)->makePartial();
+        $this->assertTrue($decoder->isFile($this->getTestImagePath()));
+        $this->assertFalse($decoder->isFile('non-existent-file'));
+    }
+
     public function testExtractExifDataFromBinary(): void
     {
         $decoder = Mockery::mock(AbstractDecoder::class)->makePartial();