+ pub fn supports_chain(&self, chain: ChainHash) -> bool {
+ self.chains().contains(&chain)
+ }
+
+ #[cfg(feature = "std")]
+ pub(super) fn is_expired(&self) -> bool {
+ match self.absolute_expiry {
+ Some(seconds_from_epoch) => match SystemTime::UNIX_EPOCH.elapsed() {
+ Ok(elapsed) => elapsed > seconds_from_epoch,
+ Err(_) => false,
+ },
+ None => false,
+ }
+ }
+
+ pub fn amount(&self) -> Option<&Amount> {
+ self.amount.as_ref()
+ }
+
+ pub(super) fn check_amount_msats_for_quantity(
+ &self, amount_msats: Option<u64>, quantity: Option<u64>
+ ) -> Result<(), SemanticError> {
+ let offer_amount_msats = match self.amount {
+ None => 0,
+ Some(Amount::Bitcoin { amount_msats }) => amount_msats,
+ Some(Amount::Currency { .. }) => return Err(SemanticError::UnsupportedCurrency),
+ };
+
+ if !self.expects_quantity() || quantity.is_some() {
+ let expected_amount_msats = offer_amount_msats.checked_mul(quantity.unwrap_or(1))
+ .ok_or(SemanticError::InvalidAmount)?;
+ let amount_msats = amount_msats.unwrap_or(expected_amount_msats);
+
+ if amount_msats < expected_amount_msats {
+ return Err(SemanticError::InsufficientAmount);
+ }
+
+ if amount_msats > MAX_VALUE_MSAT {
+ return Err(SemanticError::InvalidAmount);
+ }
+ }
+
+ Ok(())
+ }
+