[Plugin] auth_ldap: Use Pillow to convert avatar if installed

flaschengeist/plugins/auth_ldap/__init__.py

@@ -1,5 +1,5 @@
 """LDAP Authentication Provider Plugin"""
-
+import io
 import ssl
 from typing import Optional
 from flask_ldapconn import LDAPConn
@@ -176,8 +176,21 @@ class AuthLDAP(AuthPlugin):
 
     def __save_avatar(self, avatar, user):
         if avatar.mimetype != "image/jpeg":
-            raise BadRequest("Unsupported image Format")
-        # Maybe use Pillow to convert here
+            # Try converting using Pillow (if installed)
+            try:
+                from PIL import Image
+                image = Image.open(io.BytesIO(avatar.binary))
+                image_bytes = io.BytesIO()
+                image.save(image_bytes, format="JPEG")
+                avatar.binary = image_bytes.getvalue()
+                avatar.mimetype = "image/jpeg"
+            except ImportError:
+                logger.debug("Pillow not installed for image conversion")
+                raise BadRequest("Unsupported image format")
+            except IOError:
+                logger.debug(f"Could not convert avatar from '{avatar.mimetype}' to JPEG")
+                raise BadRequest("Unsupported image format")
+
         if self.admin_dn is None:
             logger.error("admin_dn missing in ldap config!")
             raise InternalServerError