Use baseurl.Parse to construct the HTTPS redirect URL in the
trust center HTTP handler, breaking the taint chain from raw
request headers. Apply path.Clean to the slug-based redirect
in stripTrustPrefix to normalize path traversal sequences.
Addresses CodeQL go/unvalidated-url-redirection (CWE-601).
Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>
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