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* feat: make OpenID token reuse window configurable via OPENID_REUSE_MAX_SESSION_AGE_MS
The OpenID session-token reuse window in AuthController was a hardcoded 15-minute
constant, forcing /api/auth/refresh to perform a real refreshTokenGrant against the
IdP every 15 minutes even when the current access token is still valid. IdPs that
rotate and revoke the previous access token on refresh then invalidate a token that
is still in use by downstream consumers of the reused OpenID token (e.g. MCP servers
that receive {{LIBRECHAT_OPENID_TOKEN}} and introspect the bearer), producing
~15-minute 401 cycles regardless of the access token's actual lifetime.
Read the window from process.env.OPENID_REUSE_MAX_SESSION_AGE_MS via the existing
math() helper, so it accepts an arithmetic expression like SESSION_EXPIRY (e.g.
60 * 60 * 24 * 1000), defaulting to the existing 15 minutes so behavior is unchanged
unless explicitly configured. The existing 30s-before-expiry guard still forces a
refresh before genuine expiry, so a larger window remains safe.
* fix: extend OpenID reuse session lifetime
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Co-authored-by: Danny Avila <danny@librechat.ai>
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