Some issuers (e.g. PaperOS) emit `scope` as a JSON array (`[]` or
`["openid","profile"]`) instead of the RFC 6749 space-delimited string.
SpaceDelimited.UnmarshalJSON now accepts both forms; a JSON array
is converted to the equivalent slice. Other non-string, non-array
values still return an error.
Adds test cases: array_values and array_empty.
Guards against the v1.2.4 bug (fixed in c32acd5) where Authenticate
held a.mux via defer for its full duration, then called
loadAndVerifyToken which also tries to acquire a.mux — deadlock on
every token auth request.
TestAuthenticateTokenNoDeadlock exercises both the bare-token
("", token) and named-username ("api", token) forms with a 1s
timeout, so a regression fails fast rather than hanging the suite.
Distinguishes the two validator constructors by signature:
- NewIDTokenValidator(iss, aud, azp []string) — allowlist semantics
- NewAccessTokenValidator(iss, aud []string, requiredScopes ...string) — requirement semantics
Variadic scopes read naturally at the call site:
NewAccessTokenValidator(issuers, audiences, "openid", "profile")
Three-state semantics preserved:
no args → scope not checked
[]string{}... → scope must be present (any value)
"openid", ... → scope must contain all listed values
Also removes the old gracePeriod parameter from both constructors
(was 0 at all call sites; set GracePeriod on the struct directly
if a non-default value is needed).
Adds TestCov_NewAccessTokenValidator_Scopes covering all three cases.
