feat: support dir creation with purpose

Author: chlsmile

api/src/main/java/com/ke/bella/files/api/FileController.java

@@ -1035,6 +1035,12 @@ public OpenAIFile mkdir(@RequestBody MkdirOp op) {
 
         validateDirectoryName(op.getName());
         validateDescription(op.getDescription());
+        if(op.getPurpose() != null && !FilePurposeClassifier.allowedPurposes().contains(op.getPurpose())) {
+            throw new IllegalArgumentException(
+                    String.format("Unsupported purpose: '%s'. Supported purposes are: %s",
+                            op.getPurpose(),
+                            String.join(", ", FilePurposeClassifier.allowedPurposes())));
+        }
 
         String spaceCode = BellaContextHelper.getOperateSpaceCode();
 
@@ -1044,7 +1050,7 @@ public OpenAIFile mkdir(@RequestBody MkdirOp op) {
                         String.format("Directory '%s' already exists in current directory, ancestor_id: '%s'", op.getName(), op.getAncestorId()));
             }
 
-            return fileService.mkdir(op.getName(), op.getAncestorId(), op.getDescription());
+            return fileService.mkdir(op.getName(), op.getAncestorId(), op.getDescription(), op.getPurpose());
         });
     }
 

api/src/main/java/com/ke/bella/files/protocol/FileSystemOps.java

@@ -28,6 +28,7 @@ public static class MkdirOp {
         private String ancestorId;
         private String name;
         private String description;
+        private String purpose;
     }
 
     @Data

api/src/main/java/com/ke/bella/files/service/FileService.java

@@ -562,7 +562,7 @@ public InputStreamWithCharset getFileInputStream(String fileId) {
         }
     }
 
-    public OpenAIFile mkdir(String name, String ancestorId, String description) {
+    public OpenAIFile mkdir(String name, String ancestorId, String description, String purpose) {
         String spaceCode = BellaContextHelper.getOperateSpaceCode();
 
         FileType fileType = FileType.DIRECTORY;
@@ -579,7 +579,7 @@ public OpenAIFile mkdir(String name, String ancestorId, String description) {
         fileDB.setPath("");
         fileDB.setBytes(0L);
         fileDB.setSpaceCode(spaceCode);
-        fileDB.setPurpose(null);
+        fileDB.setPurpose(purpose);
         fileDB.setMetaData("{}");
         fileDB.setAkCode(akCode);
         fileDB.setIsDir(1);