/// #
/// # fn example<T: AChannelManager>(channel_manager: T) -> Result<(), Bolt12SemanticError> {
/// # let channel_manager = channel_manager.get_cm();
+/// # let absolute_expiry = None;
/// let offer = channel_manager
-/// .create_offer_builder()?
+/// .create_offer_builder(absolute_expiry)?
/// # ;
/// # // Needed for compiling for c_bindings
/// # let builder: lightning::offers::offer::OfferBuilder<_, _> = offer.into();
/// many peers we reject new (inbound) connections.
const MAX_NO_CHANNEL_PEERS: usize = 250;
+/// The maximum expiration from the current time where an [`Offer`] or [`Refund`] is considered
+/// short-lived, while anything with a greater expiration is considered long-lived.
+///
+/// Using [`ChannelManager::create_offer_builder`] or [`ChannelManager::create_refund_builder`],
+/// will included a [`BlindedPath`] created using:
+/// - [`MessageRouter::create_compact_blinded_paths`] when short-lived, and
+/// - [`MessageRouter::create_blinded_paths`] when long-lived.
+///
+/// Using compact [`BlindedPath`]s may provide better privacy as the [`MessageRouter`] could select
+/// more hops. However, since they use short channel ids instead of pubkeys, they are more likely to
+/// become invalid over time as channels are closed. Thus, they are only suitable for short-term use.
+pub const MAX_SHORT_LIVED_RELATIVE_EXPIRY: Duration = Duration::from_secs(60 * 60 * 24);
+
/// Used by [`ChannelManager::list_recent_payments`] to express the status of recent payments.
/// These include payments that have yet to find a successful path, or have unresolved HTLCs.
#[derive(Debug, PartialEq)]
macro_rules! create_offer_builder { ($self: ident, $builder: ty) => {
/// Creates an [`OfferBuilder`] such that the [`Offer`] it builds is recognized by the
- /// [`ChannelManager`] when handling [`InvoiceRequest`] messages for the offer. The offer will
- /// not have an expiration unless otherwise set on the builder.
+ /// [`ChannelManager`] when handling [`InvoiceRequest`] messages for the offer. The offer's
+ /// expiration will be `absolute_expiry` if `Some`, otherwise it will not expire.
///
/// # Privacy
///
- /// Uses [`MessageRouter::create_compact_blinded_paths`] to construct a [`BlindedPath`] for the
- /// offer. However, if one is not found, uses a one-hop [`BlindedPath`] with
- /// [`ChannelManager::get_our_node_id`] as the introduction node instead. In the latter case,
- /// the node must be announced, otherwise, there is no way to find a path to the introduction in
- /// order to send the [`InvoiceRequest`].
+ /// Uses [`MessageRouter`] to construct a [`BlindedPath`] for the offer based on the given
+ /// `absolute_expiry` according to [`MAX_SHORT_LIVED_RELATIVE_EXPIRY`]. See those docs for
+ /// privacy implications as well as those of the parameterized [`Router`], which implements
+ /// [`MessageRouter`].
///
/// Also, uses a derived signing pubkey in the offer for recipient privacy.
///
///
/// [`Offer`]: crate::offers::offer::Offer
/// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
- pub fn create_offer_builder(&$self) -> Result<$builder, Bolt12SemanticError> {
+ pub fn create_offer_builder(
+ &$self, absolute_expiry: Option<Duration>
+ ) -> Result<$builder, Bolt12SemanticError> {
let node_id = $self.get_our_node_id();
let expanded_key = &$self.inbound_payment_key;
let entropy = &*$self.entropy_source;
let secp_ctx = &$self.secp_ctx;
- let path = $self.create_compact_blinded_path()
+ let path = $self.create_blinded_path_using_absolute_expiry(absolute_expiry)
.map_err(|_| Bolt12SemanticError::MissingPaths)?;
let builder = OfferBuilder::deriving_signing_pubkey(
node_id, expanded_key, entropy, secp_ctx
.chain_hash($self.chain_hash)
.path(path);
+ let builder = match absolute_expiry {
+ None => builder,
+ Some(absolute_expiry) => builder.absolute_expiry(absolute_expiry),
+ };
+
Ok(builder.into())
}
} }
///
/// # Privacy
///
- /// Uses [`MessageRouter::create_compact_blinded_paths`] to construct a [`BlindedPath`] for the
- /// refund. However, if one is not found, uses a one-hop [`BlindedPath`] with
- /// [`ChannelManager::get_our_node_id`] as the introduction node instead. In the latter case,
- /// the node must be announced, otherwise, there is no way to find a path to the introduction in
- /// order to send the [`Bolt12Invoice`].
+ /// Uses [`MessageRouter`] to construct a [`BlindedPath`] for the refund based on the given
+ /// `absolute_expiry` according to [`MAX_SHORT_LIVED_RELATIVE_EXPIRY`]. See those docs for
+ /// privacy implications as well as those of the parameterized [`Router`], which implements
+ /// [`MessageRouter`].
///
/// Also, uses a derived payer id in the refund for payer privacy.
///
let entropy = &*$self.entropy_source;
let secp_ctx = &$self.secp_ctx;
- let path = $self.create_compact_blinded_path()
+ let path = $self.create_blinded_path_using_absolute_expiry(Some(absolute_expiry))
.map_err(|_| Bolt12SemanticError::MissingPaths)?;
let builder = RefundBuilder::deriving_payer_id(
node_id, expanded_key, entropy, secp_ctx, amount_msats, payment_id
///
/// # Privacy
///
- /// Uses a one-hop [`BlindedPath`] for the reply path with [`ChannelManager::get_our_node_id`]
- /// as the introduction node and a derived payer id for payer privacy. As such, currently, the
- /// node must be announced. Otherwise, there is no way to find a path to the introduction node
- /// in order to send the [`Bolt12Invoice`].
+ /// For payer privacy, uses a derived payer id and uses [`MessageRouter::create_blinded_paths`]
+ /// to construct a [`BlindedPath`] for the reply path. For further privacy implications, see the
+ /// docs of the parameterized [`Router`], which implements [`MessageRouter`].
///
/// # Limitations
///
inbound_payment::get_payment_preimage(payment_hash, payment_secret, &self.inbound_payment_key)
}
+ /// Creates a blinded path by delegating to [`MessageRouter`] based on the path's intended
+ /// lifetime.
+ ///
+ /// Whether or not the path is compact depends on whether the path is short-lived or long-lived,
+ /// respectively, based on the given `absolute_expiry` as seconds since the Unix epoch. See
+ /// [`MAX_SHORT_LIVED_RELATIVE_EXPIRY`].
+ fn create_blinded_path_using_absolute_expiry(
+ &self, absolute_expiry: Option<Duration>
+ ) -> Result<BlindedPath, ()> {
+ let now = self.duration_since_epoch();
+ let max_short_lived_absolute_expiry = now.saturating_add(MAX_SHORT_LIVED_RELATIVE_EXPIRY);
+
+ if absolute_expiry.unwrap_or(Duration::MAX) <= max_short_lived_absolute_expiry {
+ self.create_compact_blinded_path()
+ } else {
+ self.create_blinded_path()
+ }
+ }
+
+ pub(super) fn duration_since_epoch(&self) -> Duration {
+ #[cfg(not(feature = "std"))]
+ let now = Duration::from_secs(
+ self.highest_seen_timestamp.load(Ordering::Acquire) as u64
+ );
+ #[cfg(feature = "std")]
+ let now = std::time::SystemTime::now()
+ .duration_since(std::time::SystemTime::UNIX_EPOCH)
+ .expect("SystemTime::now() should come after SystemTime::UNIX_EPOCH");
+
+ now
+ }
+
/// Creates a blinded path by delegating to [`MessageRouter::create_blinded_paths`].
///
/// Errors if the `MessageRouter` errors or returns an empty `Vec`.
let peers = self.per_peer_state.read().unwrap()
.iter()
- .filter(|(_, peer)| peer.lock().unwrap().latest_features.supports_onion_messages())
+ .map(|(node_id, peer_state)| (node_id, peer_state.lock().unwrap()))
+ .filter(|(_, peer)| peer.is_connected)
+ .filter(|(_, peer)| peer.latest_features.supports_onion_messages())
.map(|(node_id, _)| *node_id)
.collect::<Vec<_>>();
let peers = self.per_peer_state.read().unwrap()
.iter()
.map(|(node_id, peer_state)| (node_id, peer_state.lock().unwrap()))
+ .filter(|(_, peer)| peer.is_connected)
.filter(|(_, peer)| peer.latest_features.supports_onion_messages())
.map(|(node_id, peer)| ForwardNode {
node_id: *node_id,
projects / rust-lightning / blobdiff