_ Git - rust-lightning/blob - lightning-invoice/src/utils.rs

   1 //! Convenient utilities to create an invoice.
   2
   3 use {Currency, DEFAULT_EXPIRY_TIME, Invoice, InvoiceBuilder, SignOrCreationError, RawInvoice};
   4 use payment::{Payer, Router};
   5
   6 use bech32::ToBase32;
   7 use bitcoin_hashes::Hash;
   8 use lightning::chain;
   9 use lightning::chain::chaininterface::{BroadcasterInterface, FeeEstimator};
  10 use lightning::chain::keysinterface::{Sign, KeysInterface};
  11 use lightning::ln::{PaymentHash, PaymentSecret};
  12 use lightning::ln::channelmanager::{ChannelDetails, ChannelManager, PaymentId, PaymentSendFailure, MIN_FINAL_CLTV_EXPIRY};
  13 use lightning::ln::msgs::LightningError;
  14 use lightning::routing;
  15 use lightning::routing::network_graph::{NetworkGraph, RoutingFees};
  16 use lightning::routing::router::{Route, RouteHint, RouteHintHop, RouteParameters, find_route};
  17 use lightning::util::logger::Logger;
  18 use secp256k1::key::PublicKey;
  19 use std::convert::TryInto;
  20 use std::ops::Deref;
  21
  22 /// Utility to construct an invoice. Generally, unless you want to do something like a custom
  23 /// cltv_expiry, this is what you should be using to create an invoice. The reason being, this
  24 /// method stores the invoice's payment secret and preimage in `ChannelManager`, so (a) the user
  25 /// doesn't have to store preimage/payment secret information and (b) `ChannelManager` can verify
  26 /// that the payment secret is valid when the invoice is paid.
  27 pub fn create_invoice_from_channelmanager<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
  28         channelmanager: &ChannelManager<Signer, M, T, K, F, L>, keys_manager: K, network: Currency,
  29         amt_msat: Option<u64>, description: String
  30 ) -> Result<Invoice, SignOrCreationError<()>>
  31 where
  32         M::Target: chain::Watch<Signer>,
  33         T::Target: BroadcasterInterface,
  34         K::Target: KeysInterface<Signer = Signer>,
  35         F::Target: FeeEstimator,
  36         L::Target: Logger,
  37 {
  38         // Marshall route hints.
  39         let our_channels = channelmanager.list_usable_channels();
  40         let mut route_hints = vec![];
  41         for channel in our_channels {
  42                 let short_channel_id = match channel.short_channel_id {
  43                         Some(id) => id,
  44                         None => continue,
  45                 };
  46                 let forwarding_info = match channel.counterparty.forwarding_info {
  47                         Some(info) => info,
  48                         None => continue,
  49                 };
  50                 route_hints.push(RouteHint(vec![RouteHintHop {
  51                         src_node_id: channel.counterparty.node_id,
  52                         short_channel_id,
  53                         fees: RoutingFees {
  54                                 base_msat: forwarding_info.fee_base_msat,
  55                                 proportional_millionths: forwarding_info.fee_proportional_millionths,
  56                         },
  57                         cltv_expiry_delta: forwarding_info.cltv_expiry_delta,
  58                         htlc_minimum_msat: None,
  59                         htlc_maximum_msat: None,
  60                 }]));
  61         }
  62
  63         let (payment_hash, payment_secret) = channelmanager.create_inbound_payment(
  64                 amt_msat,
  65                 DEFAULT_EXPIRY_TIME.try_into().unwrap(),
  66                 0,
  67         );
  68         let our_node_pubkey = channelmanager.get_our_node_id();
  69         let mut invoice = InvoiceBuilder::new(network)
  70                 .description(description)
  71                 .current_timestamp()
  72                 .payee_pub_key(our_node_pubkey)
  73                 .payment_hash(Hash::from_slice(&payment_hash.0).unwrap())
  74                 .payment_secret(payment_secret)
  75                 .basic_mpp()
  76                 .min_final_cltv_expiry(MIN_FINAL_CLTV_EXPIRY.into());
  77         if let Some(amt) = amt_msat {
  78                 invoice = invoice.amount_milli_satoshis(amt);
  79         }
  80         for hint in route_hints {
  81                 invoice = invoice.private_route(hint);
  82         }
  83
  84         let raw_invoice = match invoice.build_raw() {
  85                 Ok(inv) => inv,
  86                 Err(e) => return Err(SignOrCreationError::CreationError(e))
  87         };
  88         let hrp_str = raw_invoice.hrp.to_string();
  89         let hrp_bytes = hrp_str.as_bytes();
  90         let data_without_signature = raw_invoice.data.to_base32();
  91         let invoice_preimage = RawInvoice::construct_invoice_preimage(hrp_bytes, &data_without_signature);
  92         let signed_raw_invoice = raw_invoice.sign(|_| keys_manager.sign_invoice(invoice_preimage));
  93         match signed_raw_invoice {
  94                 Ok(inv) => Ok(Invoice::from_signed(inv).unwrap()),
  95                 Err(e) => Err(SignOrCreationError::SignError(e))
  96         }
  97 }
  98
  99 /// A [`Router`] implemented using [`find_route`].
 100 pub struct DefaultRouter<G, L: Deref> where G: Deref<Target = NetworkGraph>, L::Target: Logger {
 101         network_graph: G,
 102         logger: L,
 103 }
 104
 105 impl<G, L: Deref> DefaultRouter<G, L> where G: Deref<Target = NetworkGraph>, L::Target: Logger {
 106         /// Creates a new router using the given [`NetworkGraph`] and  [`Logger`].
 107         pub fn new(network_graph: G, logger: L) -> Self {
 108                 Self { network_graph, logger }
 109         }
 110 }
 111
 112 impl<G, L: Deref, S: routing::Score> Router<S> for DefaultRouter<G, L>
 113 where G: Deref<Target = NetworkGraph>, L::Target: Logger {
 114         fn find_route(
 115                 &self, payer: &PublicKey, params: &RouteParameters, first_hops: Option<&[&ChannelDetails]>,
 116                 scorer: &S
 117         ) -> Result<Route, LightningError> {
 118                 find_route(payer, params, &*self.network_graph, first_hops, &*self.logger, scorer)
 119         }
 120 }
 121
 122 impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> Payer for ChannelManager<Signer, M, T, K, F, L>
 123 where
 124         M::Target: chain::Watch<Signer>,
 125         T::Target: BroadcasterInterface,
 126         K::Target: KeysInterface<Signer = Signer>,
 127         F::Target: FeeEstimator,
 128         L::Target: Logger,
 129 {
 130         fn node_id(&self) -> PublicKey {
 131                 self.get_our_node_id()
 132         }
 133
 134         fn first_hops(&self) -> Vec<ChannelDetails> {
 135                 self.list_usable_channels()
 136         }
 137
 138         fn send_payment(
 139                 &self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>
 140         ) -> Result<PaymentId, PaymentSendFailure> {
 141                 self.send_payment(route, payment_hash, payment_secret)
 142         }
 143
 144         fn retry_payment(
 145                 &self, route: &Route, payment_id: PaymentId
 146         ) -> Result<(), PaymentSendFailure> {
 147                 self.retry_payment(route, payment_id)
 148         }
 149 }
 150
 151 #[cfg(test)]
 152 mod test {
 153         use {Currency, Description, InvoiceDescription};
 154         use lightning::ln::PaymentHash;
 155         use lightning::ln::channelmanager::MIN_FINAL_CLTV_EXPIRY;
 156         use lightning::ln::functional_test_utils::*;
 157         use lightning::ln::features::InitFeatures;
 158         use lightning::ln::msgs::ChannelMessageHandler;
 159         use lightning::routing::router::{Payee, RouteParameters, find_route};
 160         use lightning::routing::scorer::Scorer;
 161         use lightning::util::events::MessageSendEventsProvider;
 162         use lightning::util::test_utils;
 163         #[test]
 164         fn test_from_channelmanager() {
 165                 let chanmon_cfgs = create_chanmon_cfgs(2);
 166                 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 167                 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 168                 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 169                 let _chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 170                 let invoice = ::utils::create_invoice_from_channelmanager(&nodes[1].node, nodes[1].keys_manager, Currency::BitcoinTestnet, Some(10_000), "test".to_string()).unwrap();
 171                 assert_eq!(invoice.amount_pico_btc(), Some(100_000));
 172                 assert_eq!(invoice.min_final_cltv_expiry(), MIN_FINAL_CLTV_EXPIRY as u64);
 173                 assert_eq!(invoice.description(), InvoiceDescription::Direct(&Description("test".to_string())));
 174
 175                 let payee = Payee::new(invoice.recover_payee_pub_key())
 176                         .with_features(invoice.features().unwrap().clone())
 177                         .with_route_hints(invoice.route_hints());
 178                 let params = RouteParameters {
 179                         payee,
 180                         final_value_msat: invoice.amount_milli_satoshis().unwrap(),
 181                         final_cltv_expiry_delta: invoice.min_final_cltv_expiry() as u32,
 182                 };
 183                 let first_hops = nodes[0].node.list_usable_channels();
 184                 let network_graph = node_cfgs[0].network_graph;
 185                 let logger = test_utils::TestLogger::new();
 186                 let scorer = Scorer::with_fixed_penalty(0);
 187                 let route = find_route(
 188                         &nodes[0].node.get_our_node_id(), &params, network_graph,
 189                         Some(&first_hops.iter().collect::<Vec<_>>()), &logger, &scorer,
 190                 ).unwrap();
 191
 192                 let payment_event = {
 193                         let mut payment_hash = PaymentHash([0; 32]);
 194                         payment_hash.0.copy_from_slice(&invoice.payment_hash().as_ref()[0..32]);
 195                         nodes[0].node.send_payment(&route, payment_hash, &Some(invoice.payment_secret().clone())).unwrap();
 196                         let mut added_monitors = nodes[0].chain_monitor.added_monitors.lock().unwrap();
 197                         assert_eq!(added_monitors.len(), 1);
 198                         added_monitors.clear();
 199
 200                         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
 201                         assert_eq!(events.len(), 1);
 202                         SendEvent::from_event(events.remove(0))
 203
 204                 };
 205                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
 206                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &payment_event.commitment_msg);
 207                 let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
 208                 assert_eq!(added_monitors.len(), 1);
 209                 added_monitors.clear();
 210                 let events = nodes[1].node.get_and_clear_pending_msg_events();
 211                 assert_eq!(events.len(), 2);
 212         }
 213 }