bugfix/fix missing extensions in file detection

CHANGELOG.md

@@ -1,3 +1,9 @@
+## 0.16.22-dev0
+
+### Fixes
+
+* **Handle filenames without extensions in file type detection**
+
 ## 0.16.21
 
 ### Enhancements

unstructured/__version__.py

@@ -1 +1 @@
-__version__ = "0.16.21"  # pragma: no cover
+__version__ = "0.16.22-dev0"  # pragma: no cover

unstructured/file_utils/filetype.py

@@ -346,11 +346,15 @@ def extension(self) -> str:
         # -- get from file_path, or file when it has a name (path) --
         with self.open() as file:
             if hasattr(file, "name") and file.name:
-                return os.path.splitext(file.name)[1].lower()
+                splitext = os.path.splitext(file.name)
+                if len(splitext) > 1:
+                    return splitext[1].lower()
 
         # -- otherwise use metadata file-path when provided --
         if file_path := self._metadata_file_path:
-            return os.path.splitext(file_path)[1].lower()
+            splitext = os.path.splitext(file_path)
+            if len(splitext) > 1:
+                return splitext[1].lower()
 
         # -- otherwise empty str means no extension, same as a path like "a/b/name-no-ext" --
         return ""