feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/domain/knowledge/processor/impl/custom_doc.go

@@ -0,0 +1,41 @@
+/*
+ * 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 impl
+
+import "github.com/coze-dev/coze-studio/backend/pkg/logs"
+
+// 用户输入自定义内容后创建文档
+type customDocProcessor struct {
+	baseDocProcessor
+}
+
+func (c *customDocProcessor) BeforeCreate() error {
+	for i := range c.Documents {
+		if c.Documents[i].RawContent != "" {
+			c.Documents[i].FileExtension = getFormatType(c.Documents[i].Type)
+			uri := getTosUri(c.UserID, string(c.Documents[i].FileExtension))
+			err := c.storage.PutObject(c.ctx, uri, []byte(c.Documents[i].RawContent))
+			if err != nil {
+				logs.CtxErrorf(c.ctx, "put object failed, err: %v", err)
+				return err
+			}
+			c.Documents[i].URI = uri
+		}
+	}
+
+	return nil
+}