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feat: add RedactHeaderValue utility to pushdown #685

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Merged
jeffreyaven merged 1 commit into from
Jul 19, 2026
Merged

feat: add RedactHeaderValue utility to pushdown #685

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20 changes: 20 additions & 0 deletions internal/stackql/pushdown/pushdown.go
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Original file line number Diff line number Diff line change
Expand Up @@ -240,3 +240,23 @@ func sqlValAsInt(expr sqlparser.Expr) (int, bool) {
}
return i, true
}

// RedactHeaderValue masks a header value for logging: alphanumerics become 'x' and the
// result is truncated to at most 5 characters. Keys present in allowedInnocuous
// (lower case) pass through unredacted.
func RedactHeaderValue(key string, val string, allowedInnocuous map[string]bool) string {
if allowedInnocuous != nil && allowedInnocuous[strings.ToLower(key)] {
return val
}
const maxRedactedLen = 5
runes := []rune(val)
if len(runes) > maxRedactedLen {
runes = runes[:maxRedactedLen]
}
for i, r := range runes {
if (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z') || (r >= '0' && r <= '9') {
runes[i] = 'x'
}
}
return string(runes)
}
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