Add first metadata values and vastly improve gallery tiling

backend/internal/services/media.go

@@ -1,11 +1,17 @@
 package services
 
 import (
+	"encoding/json"
 	"fmt"
+	"image"
+	_ "image/jpeg"
+	_ "image/png"
+	"mime/multipart"
+
 	"github.com/google/uuid"
 	"github.com/wisplite/raster/internal/db"
 	"github.com/wisplite/raster/internal/models"
-	"mime/multipart"
+	"gorm.io/datatypes"
 )
 
 func UploadMedia(file *multipart.FileHeader, albumID string, accessToken string) (models.Media, error) {
@@ -24,13 +30,31 @@ func UploadMedia(file *multipart.FileHeader, albumID string, accessToken string)
 	if albumID == "" {
 		albumPath = "root"
 	}
+
+	// Extract metadata (dimensions)
+	var meta datatypes.JSON
+	src, err := file.Open()
+	if err == nil {
+		defer src.Close()
+		cfg, _, err := image.DecodeConfig(src)
+		if err == nil {
+			m := map[string]int{
+				"width":  cfg.Width,
+				"height": cfg.Height,
+			}
+			b, _ := json.Marshal(m)
+			meta = datatypes.JSON(b)
+		}
+	}
+
 	mediaID := uuid.New().String()
 	mediaPath := fmt.Sprintf("media/%s/%s.%s", albumPath, mediaID, file.Filename)
 	media := models.Media{
-		ID:      mediaID,
-		AlbumID: albumID,
-		Path:    mediaPath,
-		Type:    file.Header.Get("Content-Type"),
+		ID:       mediaID,
+		AlbumID:  albumID,
+		Path:     mediaPath,
+		Type:     file.Header.Get("Content-Type"),
+		Metadata: meta,
 	}
 	result := db.GetDB().Create(&media)
 	if result.Error != nil {