fix: not install libmagic raise error (#13146)

api/controllers/common/helpers.py

@@ -1,13 +1,32 @@
 import mimetypes
 import os
+import platform
 import re
 import urllib.parse
+import warnings
 from collections.abc import Mapping
 from typing import Any
 from uuid import uuid4
 
 import httpx
-import magic
+
+try:
+    import magic
+except ImportError:
+    if platform.system() == "Windows":
+        warnings.warn(
+            "To use python-magic guess MIMETYPE, you need to run `pip install python-magic-bin`", stacklevel=2
+        )
+    elif platform.system() == "Darwin":
+        warnings.warn("To use python-magic guess MIMETYPE, you need to run `brew install libmagic`", stacklevel=2)
+    elif platform.system() == "Linux":
+        warnings.warn(
+            "To use python-magic guess MIMETYPE, you need to run `sudo apt-get install libmagic1`", stacklevel=2
+        )
+    else:
+        warnings.warn("To use python-magic guess MIMETYPE, you need to install `libmagic`", stacklevel=2)
+    magic = None  # type: ignore
+
 from pydantic import BaseModel
 
 from configs import dify_config
@@ -49,7 +68,7 @@ def guess_file_info_from_response(response: httpx.Response):
         mimetype = response.headers.get("Content-Type", "application/octet-stream")
 
     # Use python-magic to guess MIME type if still unknown or generic
-    if mimetype == "application/octet-stream":
+    if mimetype == "application/octet-stream" and magic is not None:
         try:
             mimetype = magic.from_buffer(response.content[:1024], mime=True)
         except magic.MagicException: