Struct LineageHeadPolicy 

pub struct LineageHeadPolicy {
    pub receipts: ReceiptPolicy,
    pub max_clock_skew_seconds: u32,
    pub max_age_seconds: Option<u32>,
}

How to treat the optional lineage_head_receipt on GET /lineages/{id}/current responses (ACDP 0.3, RFC-ACDP-0011).

The presence handling reuses the ReceiptPolicy vocabulary; the two numeric knobs are the RFC’s consumer-side parameters:

• max_clock_skew_seconds — §7 step 6’s forward-skew allowance. A receipt whose as_of is further in the future fails verification (invalid_receipt, fixture lhr-004). RFC RECOMMENDED: 120.
• max_age_seconds — §6’s freshness policy. A receipt older than this is still verified (it may be perfectly genuine — merely old); it is reported distinctly via VerifiedContext::head_receipt_stale, never as a verification failure. RFC RECOMMENDED default: 300. None disables the staleness verdict.

Fields

receipts: ReceiptPolicy

Presence handling: Ignore (skip verification, preserve verbatim), VerifyIfPresent (default), or Require (fail closed unless present AND verified — appropriate when the registry advertises acdp-registry-head-receipts, under which a head receipt on /current is REQUIRED, RFC-ACDP-0011 §6).

max_clock_skew_seconds: u32

RFC-ACDP-0011 §7 step 6 clock-skew allowance (default 120 s).

max_age_seconds: Option<u32>

RFC-ACDP-0011 §6 maximum acceptable receipt age for the staleness verdict (default Some(300)).

Trait Implementations

impl Clone for LineageHeadPolicy

fn clone(&self) -> LineageHeadPolicy

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for LineageHeadPolicy

impl Debug for LineageHeadPolicy

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for LineageHeadPolicy

fn default() -> Self

Returns the “default value” for a type.

impl Eq for LineageHeadPolicy

impl PartialEq for LineageHeadPolicy

fn eq(&self, other: &LineageHeadPolicy) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for LineageHeadPolicy