bryanck opened a new pull request, #5107:
URL: https://github.com/apache/iceberg/pull/5107

   This PR adds checks for valid identifiers before performing certain catalog 
operations in the REST catalog. Currently, the pathing for most REST requests 
includes the namespace as part of the path. This adds checks that the namespace 
is not empty to prevent the REST catalog from building a path with `//`. Using 
double slashes in the path is considered a security vulnerability by some 
frameworks so seems best to avoid. 


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