Implement Image::encodeByExtension()

src/Drivers/Gd/Decoders/FilePathImageDecoder.php

@@ -24,9 +24,11 @@ class FilePathImageDecoder extends BinaryImageDecoder implements DecoderInterfac
             throw new DecoderException('Unable to decode input');
         }
 
+        // decode image
         $image = parent::decode(file_get_contents($input));
 
-        // set origin
+        // set file path on origin
+        $image->origin()->setFilePath($input);
 
         return $image;
     }

src/Drivers/Imagick/Decoders/FilePathImageDecoder.php

@@ -12,18 +12,24 @@ class FilePathImageDecoder extends BinaryImageDecoder implements DecoderInterfac
 {
     public function decode(mixed $input): ImageInterface|ColorInterface
     {
-        if (! is_string($input)) {
+        if (!is_string($input)) {
             throw new DecoderException('Unable to decode input');
         }
 
         try {
-            if (! @is_file($input)) {
+            if (!@is_file($input)) {
                 throw new DecoderException('Unable to decode input');
             }
         } catch (Exception $e) {
             throw new DecoderException('Unable to decode input');
         }
 
-        return parent::decode(file_get_contents($input));
+        // decode image
+        $image =  parent::decode(file_get_contents($input));
+
+        // set file path on origin
+        $image->origin()->setFilePath($input);
+
+        return $image;
     }
 }

src/Encoders/AutoEncoder.php

@@ -2,12 +2,10 @@
 
 namespace Intervention\Image\Encoders;
 
-use Intervention\Gif\Exception\EncoderException;
 use Intervention\Image\Interfaces\EncodedImageInterface;
-use Intervention\Image\Interfaces\EncoderInterface;
 use Intervention\Image\Interfaces\ImageInterface;
 
-class AutoEncoder implements EncoderInterface
+class AutoEncoder extends MediaTypeEncoder
 {
     /**
      * {@inheritdoc}
@@ -22,25 +20,4 @@ class AutoEncoder implements EncoderInterface
             )
         );
     }
-
-    /**
-     * Return encoder matching to encode given media (mime) type
-     *
-     * @param string $type
-     * @return EncoderInterface
-     * @throws EncoderException
-     */
-    protected function encoderByMediaType(string $type): EncoderInterface
-    {
-        return match ($type) {
-            'image/webp' => new WebpEncoder(),
-            'image/avif' => new AvifEncoder(),
-            'image/jpeg' => new JpegEncoder(),
-            'image/bmp' => new BmpEncoder(),
-            'image/gif' => new GifEncoder(),
-            'image/png' => new PngEncoder(),
-            'image/tiff' => new TiffEncoder(),
-            default => throw new EncoderException('No encoder found for media type (' . $type . ').'),
-        };
-    }
 }

src/Encoders/FileExtensionEncoder.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace Intervention\Image\Encoders;
+
+use Intervention\Gif\Exception\EncoderException;
+use Intervention\Image\Interfaces\EncodedImageInterface;
+use Intervention\Image\Interfaces\EncoderInterface;
+use Intervention\Image\Interfaces\ImageInterface;
+
+class FileExtensionEncoder extends AutoEncoder
+{
+    /**
+     * Create new encoder instance to encode to format of given file extension
+     *
+     * @param null|string $extension
+     * @return void
+     */
+    public function __construct(protected ?string $extension = null)
+    {
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @see EncoderInterface::encode()
+     */
+    public function encode(ImageInterface $image): EncodedImageInterface
+    {
+        return $image->encode(
+            $this->encoderByFileExtension(
+                is_null($this->extension) ? $image->origin()->fileExtension() : $this->extension
+            )
+        );
+    }
+
+    protected function encoderByFileExtension(string $extension): EncoderInterface
+    {
+        return match ($extension) {
+            'webp' => new WebpEncoder(),
+            'avif' => new AvifEncoder(),
+            'jpeg', 'jpg' => new JpegEncoder(),
+            'bmp' => new BmpEncoder(),
+            'gif' => new GifEncoder(),
+            'png' => new PngEncoder(),
+            'tiff', 'tif' => new TiffEncoder(),
+            default => throw new EncoderException('No encoder found for file extension (' . $extension . ').'),
+        };
+    }
+}

src/Encoders/MediaTypeEncoder.php

@@ -2,10 +2,12 @@
 
 namespace Intervention\Image\Encoders;
 
+use Intervention\Gif\Exception\EncoderException;
 use Intervention\Image\Interfaces\EncodedImageInterface;
+use Intervention\Image\Interfaces\EncoderInterface;
 use Intervention\Image\Interfaces\ImageInterface;
 
-class MediaTypeEncoder extends AutoEncoder
+class MediaTypeEncoder implements EncoderInterface
 {
     /**
      * Create new encoder instance to encode given media (mime) type
@@ -24,10 +26,31 @@ class MediaTypeEncoder extends AutoEncoder
      */
     public function encode(ImageInterface $image): EncodedImageInterface
     {
+        $type = is_null($this->type) ? $image->origin()->mediaType() : $this->type;
+
         return $image->encode(
-            $this->encoderByMediaType(
+            $this->encoderByMediaType($type)
-                is_null($this->type) ? $image->origin()->mediaType() : $this->type
-            )
         );
     }
+
+    /**
+     * Return new encoder by given media (MIME) type
+     *
+     * @param string $type
+     * @return EncoderInterface
+     * @throws EncoderException
+     */
+    protected function encoderByMediaType(string $type): EncoderInterface
+    {
+        return match ($type) {
+            'image/webp' => new WebpEncoder(),
+            'image/avif' => new AvifEncoder(),
+            'image/jpeg' => new JpegEncoder(),
+            'image/bmp' => new BmpEncoder(),
+            'image/gif' => new GifEncoder(),
+            'image/png' => new PngEncoder(),
+            'image/tiff' => new TiffEncoder(),
+            default => throw new EncoderException('No encoder found for media type (' . $type . ').'),
+        };
+    }
 }

src/Image.php

@@ -14,6 +14,7 @@ use Intervention\Image\Analyzers\WidthAnalyzer;
 use Intervention\Image\Encoders\AutoEncoder;
 use Intervention\Image\Encoders\AvifEncoder;
 use Intervention\Image\Encoders\BmpEncoder;
+use Intervention\Image\Encoders\FileExtensionEncoder;
 use Intervention\Image\Encoders\GifEncoder;
 use Intervention\Image\Encoders\JpegEncoder;
 use Intervention\Image\Encoders\MediaTypeEncoder;
@@ -755,6 +756,16 @@ final class Image implements ImageInterface, Countable
         return $this->encode(new MediaTypeEncoder($type));
     }
 
+    /**
+     * {@inheritdoc}
+     *
+     * @see ImageInterface::encodeByExtension()
+     */
+    public function encodeByExtension(?string $extension = null): EncodedImageInterface
+    {
+        return $this->encode(new FileExtensionEncoder($extension));
+    }
+
     /**
      * {@inheritdoc}
      *

src/Interfaces/ImageInterface.php

@@ -566,6 +566,16 @@ interface ImageInterface extends IteratorAggregate, Countable
      */
     public function encodeByMediaType(?string $type = null): EncodedImageInterface;
 
+    /**
+     * Encode the image into the format represented by the given extension. If no
+     * extension is given the image will be encoded to the format of the
+     * originally read image.
+     *
+     * @param null|string $extension
+     * @return EncodedImageInterface
+     */
+    public function encodeByExtension(?string $extension = null): EncodedImageInterface;
+
     /**
      * Encode image to JPEG format
      *

src/Origin.php

@@ -8,20 +8,53 @@ class Origin
      * Create new origin instance
      *
      * @param string $mediaType
+     * @param null|string $filePath
      * @return void
      */
     public function __construct(
-        protected string $mediaType = 'application/octet-stream'
+        protected string $mediaType = 'application/octet-stream',
+        protected ?string $filePath = null
     ) {
     }
 
+    /**
+     * Return media type of origin
+     *
+     * @return string
+     */
     public function mediaType(): string
     {
         return $this->mediaType;
     }
 
+    /**
+     * Alias of self::mediaType()
+     */
     public function mimetype(): string
     {
         return $this->mediaType();
     }
+
+    /**
+     * Set file path for origin
+     *
+     * @param string $path
+     * @return Origin
+     */
+    public function setFilePath(string $path): self
+    {
+        $this->filePath = $path;
+
+        return $this;
+    }
+
+    /**
+     * Return file extension if origin was created from file path
+     *
+     * @return null|string
+     */
+    public function fileExtension(): ?string
+    {
+        return empty($this->filePath) ? null : pathinfo($this->filePath, PATHINFO_EXTENSION);
+    }
 }

tests/Drivers/Gd/ImageTest.php

@@ -133,6 +133,17 @@ class ImageTest extends TestCase
         $this->assertMediaType('image/png', (string) $result);
     }
 
+    public function testEncodeByExtension(): void
+    {
+        $result = $this->readTestImage('blue.gif')->encodeByExtension();
+        $this->assertInstanceOf(EncodedImage::class, $result);
+        $this->assertMediaType('image/gif', (string) $result);
+
+        $result = $this->readTestImage('blue.gif')->encodeByExtension('png');
+        $this->assertInstanceOf(EncodedImage::class, $result);
+        $this->assertMediaType('image/png', (string) $result);
+    }
+
     public function testWidthHeightSize(): void
     {
         $this->assertEquals(3, $this->image->width());

tests/Drivers/Imagick/ImageTest.php

@@ -132,6 +132,17 @@ class ImageTest extends TestCase
         $this->assertMediaType('image/png', (string) $result);
     }
 
+    public function testEncodeByExtension(): void
+    {
+        $result = $this->readTestImage('blue.gif')->encodeByExtension();
+        $this->assertInstanceOf(EncodedImage::class, $result);
+        $this->assertMediaType('image/gif', (string) $result);
+
+        $result = $this->readTestImage('blue.gif')->encodeByExtension('png');
+        $this->assertInstanceOf(EncodedImage::class, $result);
+        $this->assertMediaType('image/png', (string) $result);
+    }
+
     public function testWidthHeightSize(): void
     {
         $this->assertEquals(20, $this->image->width());

tests/OriginTest.php

@@ -14,4 +14,13 @@ class OriginTest extends TestCase
         $origin = new Origin('image/gif');
         $this->assertEquals('image/gif', $origin->mediaType());
     }
+
+    public function testFileExtension(): void
+    {
+        $origin = new Origin('image/jpeg', __DIR__ . '/tests/images/example.jpg');
+        $this->assertEquals('jpg', $origin->fileExtension());
+
+        $origin = new Origin('image/jpeg');
+        $this->assertEquals('', $origin->fileExtension());
+    }
 }