Improve bearer token secret redaction - #36908
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## Why Bearer credentials can contain characters outside the previous token pattern or start with another recognized key prefix. This could leave part of the credential visible after redaction. ## What changed - Recognize bearer tokens containing URL-safe and base64-style characters, optional padding, and horizontal whitespace after the scheme. - Redact bearer credentials before matching narrower OpenAI and AWS key forms so the whole credential is replaced. - Preserve delimiters following the credential and avoid matching short tokens, joined scheme names, or tokens separated by vertical or non-ASCII whitespace. ## Testing Added focused positive and negative cases for the supported token forms and false-positive boundaries. GitOrigin-RevId: 1e5b10685281dc91d232d619b938bacbadaa47f9
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Improve bearer token secret redaction
Why
Bearer credentials can contain characters outside the previous token pattern or
start with another recognized key prefix. This could leave part of the
credential visible after redaction.
What changed
optional padding, and horizontal whitespace after the scheme.
the whole credential is replaced.
joined scheme names, or tokens separated by vertical or non-ASCII whitespace.
Testing
Added focused positive and negative cases for the supported token forms and
false-positive boundaries.