chore: import upstream snapshot with attribution

pkg/obj/obj.go

@@ -0,0 +1,55 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package obj
+
+import (
+	"github.com/apache/answer/internal/base/constant"
+	"github.com/apache/answer/internal/base/reason"
+	"github.com/apache/answer/pkg/converter"
+	"github.com/segmentfault/pacman/errors"
+)
+
+// GetObjectTypeStrByObjectID get object key by object id
+func GetObjectTypeStrByObjectID(objectID string) (objectTypeStr string, err error) {
+	if err := checkObjectID(objectID); err != nil {
+		return "", err
+	}
+	objectTypeNumber := converter.StringToInt(objectID[1:4])
+	objectTypeStr, ok := constant.ObjectTypeNumberMapping[objectTypeNumber]
+	if ok {
+		return objectTypeStr, nil
+	}
+	return "", errors.BadRequest(reason.ObjectNotFound)
+}
+
+// GetObjectTypeNumberByObjectID get object type by object id
+func GetObjectTypeNumberByObjectID(objectID string) (objectTypeNumber int, err error) {
+	if err := checkObjectID(objectID); err != nil {
+		return 0, err
+	}
+	return converter.StringToInt(objectID[1:4]), nil
+}
+
+func checkObjectID(objectID string) (err error) {
+	if len(objectID) < 5 {
+		return errors.BadRequest(reason.ObjectNotFound)
+	}
+	return nil
+}