Initial QSfera import

Server/services/thumbnails/pkg/thumbnail/storage/storage.go

@@ -0,0 +1,32 @@
+package storage
+
+import (
+	"image"
+)
+
+// Request combines different attributes needed for storage operations.
+type Request struct {
+	// The checksum of the source file
+	// Will be used to determine if a thumbnail exists
+	Checksum string
+	// Types provided by the encoder.
+	// Contains the mimetypes of the thumbnail.
+	// In case of jpg/jpeg it will contain both.
+	Types []string
+	// The resolution of the thumbnail
+	Resolution image.Rectangle
+	// Characteristic defines the different image characteristics,
+	// for example, if it's scaled up to fit in the bounding box or not,
+	// is it a chroma version of the image, and so on...
+	// the main propose for this is to be able to differentiate between images which have
+	// the same resolution but different characteristics.
+	Characteristic string
+}
+
+// Storage defines the interface for a thumbnail store.
+type Storage interface {
+	Stat(key string) bool
+	Get(key string) ([]byte, error)
+	Put(key string, img []byte) error
+	BuildKey(r Request) string
+}