feat(data-process): 完善文件解析与切分存储链路

backend/app/schemas/data_process.py

@@ -13,6 +13,24 @@ def _config_value(config: dict[str, Any], snake_name: str, camel_name: str, defa
 
 
 def _validate_process_config(config: dict[str, Any]) -> None:
+    chunk_method = _config_value(config, "chunk_method", "chunkMethod", "structure")
+    if not isinstance(chunk_method, str) or chunk_method not in {
+        "structure",
+        "fixed",
+        "custom",
+    }:
+        raise ValueError("chunk_method must be one of: structure, fixed, custom")
+    custom_delimiter = _config_value(
+        config,
+        "custom_delimiter",
+        "customDelimiter",
+        "",
+    )
+    if chunk_method == "custom" and (
+        not isinstance(custom_delimiter, str) or not custom_delimiter
+    ):
+        raise ValueError("custom_delimiter is required for custom chunking")
+
     split = _config_value(config, "dataset_split", "datasetSplit", None)
     if split is not None:
         if not isinstance(split, dict) or set(split) != {"train", "validation", "test"}:
@@ -140,6 +158,23 @@ class PreviewBuildRequest(BaseModel):
 
     replace_existing: Literal[True] = True
     source_file_ids: list[str] | None = None
+    source_file_id: str | None = None
+
+    @model_validator(mode="after")
+    def validate_source_file_selection(self) -> "PreviewBuildRequest":
+        if self.source_file_ids is not None and self.source_file_id is not None:
+            raise ValueError("source_file_id and source_file_ids cannot be used together")
+        values = self.source_file_ids
+        if values is None and self.source_file_id is not None:
+            values = [self.source_file_id]
+        if values is None:
+            return self
+        normalized = list(dict.fromkeys(str(value).strip() for value in values))
+        if not normalized or any(not value for value in normalized):
+            raise ValueError("at least one non-empty source file id is required")
+        self.source_file_ids = normalized
+        self.source_file_id = None
+        return self
 
 
 class PreviewItemCreate(BaseModel):