adnanhemani commented on PR #1604:
URL: https://github.com/apache/polaris/pull/1604#issuecomment-2892234327
> Can you elaborate on when .. would be a valid in a path? For me, .. is a
path-traversal in the presence of it raises the question "why is this not the
source of a path-traversal-attack".
Blob Storage providers like S3 and GCS do not recognize ".." as a path
traversal. If you store an object in S3 with the path "s3://abcd/a/b/../c", S3
stores the object exactly as such - it will not normalize the path into
"s3://abcd/a/c". While it may be an anti-pattern to make such a location, we
should not deviate from what the blob storage provider allows/does. The same
can be said about multiple forward slashes together ("s3://abcd/a/b//c" is not
the same as "s3://abcd/a/b/c").
As a result, we should only allow ".." and "." normalization in local
filesystem calls where these can be resolved - and those are the code paths
where Java URI is being used in this PR. WDYT?
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