gateway-azure: Return right error when Part size is > 100MB (#4652)

cmd/api-errors.go

@@ -725,6 +725,8 @@ func toAPIErrorCode(err error) (apiErr APIErrorCode) {
 		apiErr = ErrNotImplemented
 	case PolicyNotFound:
 		apiErr = ErrNoSuchBucketPolicy
+	case PartTooBig:
+		apiErr = ErrEntityTooLarge
 	default:
 		apiErr = ErrInternalError
 	}

cmd/gateway-azure.go

@@ -142,6 +142,8 @@ func azureToObjectError(err error, params ...string) error {
 		err = BucketExists{Bucket: bucket}
 	case "InvalidResourceName":
 		err = BucketNameInvalid{Bucket: bucket}
+	case "RequestBodyTooLarge":
+		err = PartTooBig{}
 	default:
 		switch azureErr.StatusCode {
 		case http.StatusNotFound:

cmd/object-api-errors.go

@@ -343,6 +343,13 @@ func (e PartTooSmall) Error() string {
 	return fmt.Sprintf("Part size for %d should be atleast 5MB", e.PartNumber)
 }
 
+// PartTooBig returned if size of part is bigger than the allowed limit.
+type PartTooBig struct{}
+
+func (e PartTooBig) Error() string {
+	return "Part size bigger than the allowed limit"
+}
+
 // NotImplemented If a feature is not implemented
 type NotImplemented struct{}