create the api for the display list

gateway/app/routers/documents.py

@@ -835,3 +835,39 @@ def replace_text_object(document_id: str, page_index: int, object_index: int, re
             os.remove(tmp_path)
         if os.path.exists(out_path):
             os.remove(out_path)
+
+@router.get("/{document_id}/pages/{page_index}/display_list")
+def get_display_list(document_id: str, page_index: int):
+    if not engine.is_available():
+        raise HTTPException(status_code=501, detail="Engine not available")
+        
+    doc_info = document_store.get_document(document_id)
+    if not doc_info:
+        raise HTTPException(status_code=404, detail="Document not found")
+
+    try:
+        doc = doc_info["doc_instance"]
+        page = doc.get_page(page_index)
+        json_str = page.extract_display_list()
+        return Response(content=json_str, media_type="application/json")
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+@router.get("/{document_id}/pages/{page_index}/xobjects/{name}")
+def get_image_xobject(document_id: str, page_index: int, name: str):
+    if not engine.is_available():
+        raise HTTPException(status_code=501, detail="Engine not available")
+        
+    doc_info = document_store.get_document(document_id)
+    if not doc_info:
+        raise HTTPException(status_code=404, detail="Document not found")
+
+    try:
+        doc = doc_info["doc_instance"]
+        page = doc.get_page(page_index)
+        img_bytes = page.extract_image_xobject(name)
+        if not img_bytes:
+            raise HTTPException(status_code=404, detail="Image not found")
+        return Response(content=img_bytes, media_type="image/png")
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))