feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/domain/workflow/entity/vo/draft.go

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed 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 vo
+
+import (
+	"time"
+
+	"github.com/coze-dev/coze-studio/backend/pkg/sonic"
+)
+
+type DraftInfo struct {
+	*DraftMeta
+
+	Canvas          string
+	InputParamsStr  string
+	OutputParamsStr string
+
+	CommitID string
+}
+
+type CanvasInfo struct {
+	Canvas          string
+	InputParams     []*NamedTypeInfo
+	OutputParams    []*NamedTypeInfo
+	InputParamsStr  string
+	OutputParamsStr string
+}
+
+func (c *CanvasInfo) Unmarshal() error {
+	if c.InputParamsStr != "" && len(c.InputParams) == 0 {
+		var input []*NamedTypeInfo
+		err := sonic.UnmarshalString(c.InputParamsStr, &input)
+		if err != nil {
+			return err
+		}
+		c.InputParams = input
+	}
+
+	if c.OutputParamsStr != "" && len(c.OutputParams) == 0 {
+		var output []*NamedTypeInfo
+		err := sonic.UnmarshalString(c.OutputParamsStr, &output)
+		if err != nil {
+			return err
+		}
+		c.OutputParams = output
+	}
+
+	return nil
+}
+
+type DraftMeta struct {
+	TestRunSuccess bool
+	Modified       bool
+	Timestamp      time.Time
+	IsSnapshot     bool // if true, this is a snapshot of a previous draft content, not the latest draft
+}