[server] Add struct for fileData config

server/configurations/local.yaml

@@ -169,6 +169,15 @@ s3:
     # resolved, e.g. when running a local instance, or when using MinIO as a
     # production store.
     #use_path_style_urls: true
+    #
+    # file-data-storage:
+    #     derivedMetadata:
+    #         bucket:
+    #         replicas: []
+    #     img_preview:
+    #         bucket:
+    #         replicas: []
+
 
 # Key used for encrypting customer emails before storing them in DB
 #

server/pkg/utils/s3config/filedata.go

@@ -0,0 +1,12 @@
+package s3config
+
+import "github.com/ente-io/museum/ente"
+
+type ObjectBucketConfig struct {
+	PrimaryBucket  string   `mapstructure:"primary"`
+	ReplicaBuckets []string `mapstructure:"replicas"`
+}
+
+type FileDataConfig struct {
+	ObjectBucketConfig map[ente.ObjectType]ObjectBucketConfig `mapstructure:"objectBuckets"`
+}