Implement gateway S3 support (#3940)

cmd/object-api-errors.go

@@ -144,6 +144,13 @@ func (e BucketNotFound) Error() string {
 	return "Bucket not found: " + e.Bucket
 }
 
+// BucketAlreadyOwnedByYou already owned by you.
+type BucketAlreadyOwnedByYou GenericError
+
+func (e BucketAlreadyOwnedByYou) Error() string {
+	return "Bucket already owned by you: " + e.Bucket
+}
+
 // BucketNotEmpty bucket is not empty.
 type BucketNotEmpty GenericError
 
@@ -321,6 +328,13 @@ func (e NotImplemented) Error() string {
 	return "Not Implemented"
 }
 
+// NotSupported If a feature is not supported
+type NotSupported struct{}
+
+func (e NotSupported) Error() string {
+	return "Not Supported"
+}
+
 // PolicyNesting - policy nesting conflict.
 type PolicyNesting struct{}
 
@@ -328,6 +342,13 @@ func (e PolicyNesting) Error() string {
 	return "New bucket policy conflicts with an existing policy. Please try again with new prefix."
 }
 
+// PolicyNotFound - policy not found
+type PolicyNotFound GenericError
+
+func (e PolicyNotFound) Error() string {
+	return "Policy not found"
+}
+
 // Check if error type is IncompleteBody.
 func isErrIncompleteBody(err error) bool {
 	err = errorCause(err)