add local filesystem storage for packages and assets with upload handlers

portal/internal/storage/icons.go

@@ -0,0 +1,64 @@
+package storage
+
+import (
+	"bytes"
+	"fmt"
+	"image"
+	"image/png"
+	"io"
+
+	// Import image formats for decoding
+	_ "image/gif"
+	_ "image/jpeg"
+
+	"golang.org/x/image/draw"
+)
+
+// IconSizes defines the icon sizes to generate
+var IconSizes = []int{32, 64, 128}
+
+// ProcessIcon reads an image and generates icons at multiple sizes
+func (s *Storage) ProcessIcon(appID string, r io.Reader) error {
+	// Decode the image
+	img, _, err := image.Decode(r)
+	if err != nil {
+		return fmt.Errorf("failed to decode image: %w", err)
+	}
+
+	// Validate square dimensions
+	bounds := img.Bounds()
+	if bounds.Dx() != bounds.Dy() {
+		return fmt.Errorf("icon must be square, got %dx%d", bounds.Dx(), bounds.Dy())
+	}
+
+	// Minimum size check
+	if bounds.Dx() < 128 {
+		return fmt.Errorf("icon must be at least 128x128, got %dx%d", bounds.Dx(), bounds.Dy())
+	}
+
+	// Generate each size
+	for _, size := range IconSizes {
+		resized := resizeImage(img, size, size)
+
+		var buf bytes.Buffer
+		if err := png.Encode(&buf, resized); err != nil {
+			return fmt.Errorf("failed to encode icon-%d: %w", size, err)
+		}
+
+		if err := s.SaveIcon(appID, size, buf.Bytes()); err != nil {
+			return fmt.Errorf("failed to save icon-%d: %w", size, err)
+		}
+	}
+
+	return nil
+}
+
+// resizeImage resizes an image to the specified dimensions using high-quality interpolation
+func resizeImage(src image.Image, width, height int) image.Image {
+	dst := image.NewRGBA(image.Rect(0, 0, width, height))
+
+	// Use CatmullRom for high-quality downscaling
+	draw.CatmullRom.Scale(dst, dst.Bounds(), src, src.Bounds(), draw.Over, nil)
+
+	return dst
+}