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

   1 //! Convenient utilities to create an invoice.
   2
   3 use {CreationError, Currency, DEFAULT_EXPIRY_TIME, Invoice, InvoiceBuilder, SignOrCreationError};
   4 use payment::{Payer, Router};
   5
   6 use bech32::ToBase32;
   7 use bitcoin_hashes::Hash;
   8 use crate::prelude::*;
   9 use lightning::chain;
  10 use lightning::chain::chaininterface::{BroadcasterInterface, FeeEstimator};
  11 use lightning::chain::keysinterface::{Recipient, KeysInterface, Sign};
  12 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
  13 use lightning::ln::channelmanager::{ChannelDetails, ChannelManager, PaymentId, PaymentSendFailure, MIN_FINAL_CLTV_EXPIRY};
  14 use lightning::ln::msgs::LightningError;
  15 use lightning::routing::scoring::Score;
  16 use lightning::routing::network_graph::{NetworkGraph, RoutingFees};
  17 use lightning::routing::router::{Route, RouteHint, RouteHintHop, RouteParameters, find_route};
  18 use lightning::util::logger::Logger;
  19 use secp256k1::key::PublicKey;
  20 use core::convert::TryInto;
  21 use core::ops::Deref;
  22 use core::time::Duration;
  23
  24 #[cfg(feature = "std")]
  25 /// Utility to construct an invoice. Generally, unless you want to do something like a custom
  26 /// cltv_expiry, this is what you should be using to create an invoice. The reason being, this
  27 /// method stores the invoice's payment secret and preimage in `ChannelManager`, so (a) the user
  28 /// doesn't have to store preimage/payment secret information and (b) `ChannelManager` can verify
  29 /// that the payment secret is valid when the invoice is paid.
  30 pub fn create_invoice_from_channelmanager<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
  31         channelmanager: &ChannelManager<Signer, M, T, K, F, L>, keys_manager: K, network: Currency,
  32         amt_msat: Option<u64>, description: String
  33 ) -> Result<Invoice, SignOrCreationError<()>>
  34 where
  35         M::Target: chain::Watch<Signer>,
  36         T::Target: BroadcasterInterface,
  37         K::Target: KeysInterface<Signer = Signer>,
  38         F::Target: FeeEstimator,
  39         L::Target: Logger,
  40 {
  41         use std::time::SystemTime;
  42         let duration = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)
  43                 .expect("for the foreseeable future this shouldn't happen");
  44         create_invoice_from_channelmanager_and_duration_since_epoch(
  45                 channelmanager,
  46                 keys_manager,
  47                 network,
  48                 amt_msat,
  49                 description,
  50                 duration
  51         )
  52 }
  53
  54 /// See [`create_invoice_from_channelmanager`]
  55 /// This version can be used in a `no_std` environment, where [`std::time::SystemTime`] is not
  56 /// available and the current time is supplied by the caller.
  57 pub fn create_invoice_from_channelmanager_and_duration_since_epoch<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
  58         channelmanager: &ChannelManager<Signer, M, T, K, F, L>, keys_manager: K, network: Currency,
  59         amt_msat: Option<u64>, description: String, duration_since_epoch: Duration,
  60 ) -> Result<Invoice, SignOrCreationError<()>>
  61 where
  62         M::Target: chain::Watch<Signer>,
  63         T::Target: BroadcasterInterface,
  64         K::Target: KeysInterface<Signer = Signer>,
  65         F::Target: FeeEstimator,
  66         L::Target: Logger,
  67 {
  68         // Marshall route hints.
  69         let our_channels = channelmanager.list_usable_channels();
  70         let mut route_hints = vec![];
  71         for channel in our_channels {
  72                 let short_channel_id = match channel.short_channel_id {
  73                         Some(id) => id,
  74                         None => continue,
  75                 };
  76                 let forwarding_info = match channel.counterparty.forwarding_info {
  77                         Some(info) => info,
  78                         None => continue,
  79                 };
  80                 route_hints.push(RouteHint(vec![RouteHintHop {
  81                         src_node_id: channel.counterparty.node_id,
  82                         short_channel_id,
  83                         fees: RoutingFees {
  84                                 base_msat: forwarding_info.fee_base_msat,
  85                                 proportional_millionths: forwarding_info.fee_proportional_millionths,
  86                         },
  87                         cltv_expiry_delta: forwarding_info.cltv_expiry_delta,
  88                         htlc_minimum_msat: None,
  89                         htlc_maximum_msat: None,
  90                 }]));
  91         }
  92
  93         // `create_inbound_payment` only returns an error if the amount is greater than the total bitcoin
  94         // supply.
  95         let (payment_hash, payment_secret) = channelmanager.create_inbound_payment(
  96                 amt_msat, DEFAULT_EXPIRY_TIME.try_into().unwrap())
  97                 .map_err(|()| SignOrCreationError::CreationError(CreationError::InvalidAmount))?;
  98         let our_node_pubkey = channelmanager.get_our_node_id();
  99         let mut invoice = InvoiceBuilder::new(network)
 100                 .description(description)
 101                 .duration_since_epoch(duration_since_epoch)
 102                 .payee_pub_key(our_node_pubkey)
 103                 .payment_hash(Hash::from_slice(&payment_hash.0).unwrap())
 104                 .payment_secret(payment_secret)
 105                 .basic_mpp()
 106                 .min_final_cltv_expiry(MIN_FINAL_CLTV_EXPIRY.into());
 107         if let Some(amt) = amt_msat {
 108                 invoice = invoice.amount_milli_satoshis(amt);
 109         }
 110         for hint in route_hints {
 111                 invoice = invoice.private_route(hint);
 112         }
 113
 114         let raw_invoice = match invoice.build_raw() {
 115                 Ok(inv) => inv,
 116                 Err(e) => return Err(SignOrCreationError::CreationError(e))
 117         };
 118         let hrp_str = raw_invoice.hrp.to_string();
 119         let hrp_bytes = hrp_str.as_bytes();
 120         let data_without_signature = raw_invoice.data.to_base32();
 121         let signed_raw_invoice = raw_invoice.sign(|_| keys_manager.sign_invoice(hrp_bytes, &data_without_signature, Recipient::Node));
 122         match signed_raw_invoice {
 123                 Ok(inv) => Ok(Invoice::from_signed(inv).unwrap()),
 124                 Err(e) => Err(SignOrCreationError::SignError(e))
 125         }
 126 }
 127
 128 /// A [`Router`] implemented using [`find_route`].
 129 pub struct DefaultRouter<G: Deref<Target = NetworkGraph>, L: Deref> where L::Target: Logger {
 130         network_graph: G,
 131         logger: L,
 132 }
 133
 134 impl<G: Deref<Target = NetworkGraph>, L: Deref> DefaultRouter<G, L> where L::Target: Logger {
 135         /// Creates a new router using the given [`NetworkGraph`] and  [`Logger`].
 136         pub fn new(network_graph: G, logger: L) -> Self {
 137                 Self { network_graph, logger }
 138         }
 139 }
 140
 141 impl<G: Deref<Target = NetworkGraph>, L: Deref, S: Score> Router<S> for DefaultRouter<G, L>
 142 where L::Target: Logger {
 143         fn find_route(
 144                 &self, payer: &PublicKey, params: &RouteParameters, _payment_hash: &PaymentHash,
 145                 first_hops: Option<&[&ChannelDetails]>, scorer: &S
 146         ) -> Result<Route, LightningError> {
 147                 find_route(payer, params, &*self.network_graph, first_hops, &*self.logger, scorer)
 148         }
 149 }
 150
 151 impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> Payer for ChannelManager<Signer, M, T, K, F, L>
 152 where
 153         M::Target: chain::Watch<Signer>,
 154         T::Target: BroadcasterInterface,
 155         K::Target: KeysInterface<Signer = Signer>,
 156         F::Target: FeeEstimator,
 157         L::Target: Logger,
 158 {
 159         fn node_id(&self) -> PublicKey {
 160                 self.get_our_node_id()
 161         }
 162
 163         fn first_hops(&self) -> Vec<ChannelDetails> {
 164                 self.list_usable_channels()
 165         }
 166
 167         fn send_payment(
 168                 &self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>
 169         ) -> Result<PaymentId, PaymentSendFailure> {
 170                 self.send_payment(route, payment_hash, payment_secret)
 171         }
 172
 173         fn send_spontaneous_payment(
 174                 &self, route: &Route, payment_preimage: PaymentPreimage,
 175         ) -> Result<PaymentId, PaymentSendFailure> {
 176                 self.send_spontaneous_payment(route, Some(payment_preimage))
 177                         .map(|(_, payment_id)| payment_id)
 178         }
 179
 180         fn retry_payment(
 181                 &self, route: &Route, payment_id: PaymentId
 182         ) -> Result<(), PaymentSendFailure> {
 183                 self.retry_payment(route, payment_id)
 184         }
 185
 186         fn abandon_payment(&self, payment_id: PaymentId) {
 187                 self.abandon_payment(payment_id)
 188         }
 189 }
 190
 191 #[cfg(test)]
 192 mod test {
 193         use core::time::Duration;
 194         use {Currency, Description, InvoiceDescription};
 195         use lightning::ln::PaymentHash;
 196         use lightning::ln::channelmanager::MIN_FINAL_CLTV_EXPIRY;
 197         use lightning::ln::functional_test_utils::*;
 198         use lightning::ln::features::InitFeatures;
 199         use lightning::ln::msgs::ChannelMessageHandler;
 200         use lightning::routing::router::{PaymentParameters, RouteParameters, find_route};
 201         use lightning::util::events::MessageSendEventsProvider;
 202         use lightning::util::test_utils;
 203         use utils::create_invoice_from_channelmanager_and_duration_since_epoch;
 204
 205         #[test]
 206         fn test_from_channelmanager() {
 207                 let chanmon_cfgs = create_chanmon_cfgs(2);
 208                 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 209                 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 210                 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 211                 let _chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 212                 let invoice = create_invoice_from_channelmanager_and_duration_since_epoch(
 213                         &nodes[1].node, nodes[1].keys_manager, Currency::BitcoinTestnet, Some(10_000), "test".to_string(),
 214                         Duration::from_secs(1234567)).unwrap();
 215                 assert_eq!(invoice.amount_pico_btc(), Some(100_000));
 216                 assert_eq!(invoice.min_final_cltv_expiry(), MIN_FINAL_CLTV_EXPIRY as u64);
 217                 assert_eq!(invoice.description(), InvoiceDescription::Direct(&Description("test".to_string())));
 218
 219                 let payment_params = PaymentParameters::from_node_id(invoice.recover_payee_pub_key())
 220                         .with_features(invoice.features().unwrap().clone())
 221                         .with_route_hints(invoice.route_hints());
 222                 let route_params = RouteParameters {
 223                         payment_params,
 224                         final_value_msat: invoice.amount_milli_satoshis().unwrap(),
 225                         final_cltv_expiry_delta: invoice.min_final_cltv_expiry() as u32,
 226                 };
 227                 let first_hops = nodes[0].node.list_usable_channels();
 228                 let network_graph = node_cfgs[0].network_graph;
 229                 let logger = test_utils::TestLogger::new();
 230                 let scorer = test_utils::TestScorer::with_penalty(0);
 231                 let route = find_route(
 232                         &nodes[0].node.get_our_node_id(), &route_params, network_graph,
 233                         Some(&first_hops.iter().collect::<Vec<_>>()), &logger, &scorer,
 234                 ).unwrap();
 235
 236                 let payment_event = {
 237                         let mut payment_hash = PaymentHash([0; 32]);
 238                         payment_hash.0.copy_from_slice(&invoice.payment_hash().as_ref()[0..32]);
 239                         nodes[0].node.send_payment(&route, payment_hash, &Some(invoice.payment_secret().clone())).unwrap();
 240                         let mut added_monitors = nodes[0].chain_monitor.added_monitors.lock().unwrap();
 241                         assert_eq!(added_monitors.len(), 1);
 242                         added_monitors.clear();
 243
 244                         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
 245                         assert_eq!(events.len(), 1);
 246                         SendEvent::from_event(events.remove(0))
 247
 248                 };
 249                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
 250                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &payment_event.commitment_msg);
 251                 let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
 252                 assert_eq!(added_monitors.len(), 1);
 253                 added_monitors.clear();
 254                 let events = nodes[1].node.get_and_clear_pending_msg_events();
 255                 assert_eq!(events.len(), 2);
 256         }
 257 }