Add support for ILM transition (#10565)

This PR adds transition support for ILM
to transition data to another MinIO target
represented by a storage class ARN. Subsequent
GET or HEAD for that object will be streamed from
the transition tier. If PostRestoreObject API is
invoked, the transitioned object can be restored for
duration specified to the source cluster.

pkg/bucket/policy/action.go

@@ -169,6 +169,9 @@ const (
 
 	// GetObjectVersionForReplicationAction  - GetObjectVersionForReplication REST API action
 	GetObjectVersionForReplicationAction = "s3:GetObjectVersionForReplication"
+
+	// RestoreObjectAction - RestoreObject REST API action
+	RestoreObjectAction = "s3:RestoreObject"
 )
 
 // List of all supported object actions.
@@ -195,6 +198,7 @@ var supportedObjectActions = map[Action]struct{}{
 	ReplicateDeleteAction:                {},
 	ReplicateTagsAction:                  {},
 	GetObjectVersionForReplicationAction: {},
+	RestoreObjectAction:                  {},
 }
 
 // isObjectAction - returns whether action is object type or not.
@@ -255,6 +259,7 @@ var supportedActions = map[Action]struct{}{
 	ReplicateDeleteAction:                  {},
 	ReplicateTagsAction:                    {},
 	GetObjectVersionForReplicationAction:   {},
+	RestoreObjectAction:                    {},
 }
 
 // IsValid - checks if action is valid or not.
@@ -410,4 +415,5 @@ var actionConditionKeyMap = map[Action]condition.KeySet{
 	ReplicateDeleteAction:                condition.NewKeySet(condition.CommonKeys...),
 	ReplicateTagsAction:                  condition.NewKeySet(condition.CommonKeys...),
 	GetObjectVersionForReplicationAction: condition.NewKeySet(condition.CommonKeys...),
+	RestoreObjectAction:                  condition.NewKeySet(condition.CommonKeys...),
 }