feat: #43 Add PNG support

internal/images/image.go

@@ -6,6 +6,7 @@ import (
 	"image/jpeg"
 	_ "image/jpeg"
 	"path/filepath"
+	"slices"
 	"strings"
 
 	"github.com/disintegration/imaging"
@@ -20,8 +21,9 @@ type ImageSize struct {
 }
 
 func IsPhotoSupported(path string) bool {
-	lowerExt := strings.ToLower(filepath.Ext(path))
-	return lowerExt == ".jpeg" || lowerExt == ".jpg" || lowerExt == ".webp"
+	return slices.Contains(
+		[]string{".jpeg", ".jpg", ".webp", ".png"},
+		strings.ToLower(filepath.Ext(path)))
 }
 
 func GetPhotoSize(path string) (*ImageSize, error) {

internal/images/image_test.go

@@ -14,7 +14,8 @@ func TestPhotoSupport(t *testing.T) {
 	assert.True(t, IsPhotoSupported("photo.jpg"))
 	assert.True(t, IsPhotoSupported("photo.jpeg"))
 	assert.True(t, IsPhotoSupported("photo.webp"))
-	assert.False(t, IsPhotoSupported("photo.png"))
+	assert.True(t, IsPhotoSupported("photo.png"))
+	assert.False(t, IsPhotoSupported("photo.xxx"))
 }
 
 func TestGetPhotoSize(t *testing.T) {
@@ -101,3 +102,24 @@ func TestWebpSupport(t *testing.T) {
 	checksum, _ := files.Checksum(path)
 	assert.Equal(t, testdata.WebpExpectedThubmnailChecksum, *checksum)
 }
+
+func TestPngSupport(t *testing.T) {
+	tmp, err := os.MkdirTemp("", "foto-test")
+	assert.Nil(t, err)
+
+	size, err := GetPhotoSize(testdata.PngTestFile)
+	assert.Equal(t, testdata.PngTestfileWidth, size.Width)
+	assert.Equal(t, testdata.PngTestfileHeight, size.Height)
+
+	path := filepath.Join(tmp, "resized.png")
+
+	err = ResizeImage(testdata.PngTestFile, path, testdata.PngThumbnailWidth, testdata.CompressQuality)
+	assert.Nil(t, err)
+
+	size, err = GetPhotoSize(path)
+	assert.Equal(t, testdata.PngThumbnailWidth, size.Width)
+	assert.Equal(t, testdata.PngThumbnailHeight, size.Height)
+
+	checksum, _ := files.Checksum(path)
+	assert.Equal(t, testdata.PngExpectedThubmnailChecksum, *checksum)
+}

internal/testdata/testdata.go

@@ -130,3 +130,13 @@ var (
 	WebpThumbnailHeight           = 480
 	WebpExpectedThubmnailChecksum = "5a5f8fcae2e37e504d6e062ee8adefac45ec9102a410faa16d4a0278b310b0c8"
 )
+
+var (
+	PngTestFile       = "../../testdata/png/test.png"
+	PngTestfileWidth  = 1024
+	PngTestfileHeight = 768
+
+	PngThumbnailWidth            = 640
+	PngThumbnailHeight           = 480
+	PngExpectedThubmnailChecksum = "c52322af93c85de909aa5774f58ab2b26ad13f95e405f4ce42703468f3490ab3"
+)