rename folder extensions -> services

Signed-off-by: Christian Richter <crichter@owncloud.com>

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

@@ -0,0 +1,44 @@
+package storage
+
+import (
+	"strings"
+)
+
+// NewInMemoryStorage creates a new InMemory instance.
+func NewInMemoryStorage() InMemory {
+	return InMemory{
+		store: make(map[string][]byte),
+	}
+}
+
+// InMemory represents an in memory storage for thumbnails
+// Can be used during development
+type InMemory struct {
+	store map[string][]byte
+}
+
+func (s InMemory) Stat(key string) bool {
+	_, exists := s.store[key]
+	return exists
+}
+
+// Get loads the thumbnail from memory.
+func (s InMemory) Get(key string) ([]byte, error) {
+	return s.store[key], nil
+}
+
+// Set stores the thumbnail in memory.
+func (s InMemory) Put(key string, thumbnail []byte) error {
+	s.store[key] = thumbnail
+	return nil
+}
+
+// BuildKey generates a unique key to store and retrieve the thumbnail.
+func (s InMemory) BuildKey(r Request) string {
+	parts := []string{
+		r.Checksum,
+		r.Resolution.String(),
+		strings.Join(r.Types, ","),
+	}
+	return strings.Join(parts, "+")
+}