Add file size limit for presigned posts

Author: RadoRado

styleguide_example/integrations/aws/client.py

@@ -88,7 +88,11 @@ def s3_generate_presigned_post(*, file_path: str, file_type: str) -> Dict[str, A
         },
         Conditions=[
             {"acl": acl},
-            {"Content-Type": file_type}
+            {"Content-Type": file_type},
+            # As an example, allow file size up to 10 MiB
+            # More on conditions, here:
+            # https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-HTTPPOSTConstructPolicy.html
+            ["content-length-range", 1, 10485760]
         ],
         ExpiresIn=expires_in,
     )