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

   1 //! Convenient utilities to create an invoice.
   2 use {Currency, DEFAULT_EXPIRY_TIME, Invoice, InvoiceBuilder, SignOrCreationError, RawInvoice};
   3 use bech32::ToBase32;
   4 use bitcoin_hashes::Hash;
   5 use lightning::chain;
   6 use lightning::chain::chaininterface::{BroadcasterInterface, FeeEstimator};
   7 use lightning::chain::keysinterface::{Sign, KeysInterface};
   8 use lightning::ln::channelmanager::{ChannelManager, MIN_FINAL_CLTV_EXPIRY};
   9 use lightning::routing::network_graph::RoutingFees;
  10 use lightning::routing::router::{RouteHint, RouteHintHop};
  11 use lightning::util::logger::Logger;
  12 use std::convert::TryInto;
  13 use std::ops::Deref;
  14
  15 /// Utility to construct an invoice. Generally, unless you want to do something like a custom
  16 /// cltv_expiry, this is what you should be using to create an invoice. The reason being, this
  17 /// method stores the invoice's payment secret and preimage in `ChannelManager`, so (a) the user
  18 /// doesn't have to store preimage/payment secret information and (b) `ChannelManager` can verify
  19 /// that the payment secret is valid when the invoice is paid.
  20 pub fn create_invoice_from_channelmanager<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
  21         channelmanager: &ChannelManager<Signer, M, T, K, F, L>, keys_manager: K, network: Currency,
  22         amt_msat: Option<u64>, description: String
  23 ) -> Result<Invoice, SignOrCreationError<()>>
  24 where
  25         M::Target: chain::Watch<Signer>,
  26         T::Target: BroadcasterInterface,
  27         K::Target: KeysInterface<Signer = Signer>,
  28         F::Target: FeeEstimator,
  29         L::Target: Logger,
  30 {
  31         // Marshall route hints.
  32         let our_channels = channelmanager.list_usable_channels();
  33         let mut route_hints = vec![];
  34         for channel in our_channels {
  35                 let short_channel_id = match channel.short_channel_id {
  36                         Some(id) => id,
  37                         None => continue,
  38                 };
  39                 let forwarding_info = match channel.counterparty_forwarding_info {
  40                         Some(info) => info,
  41                         None => continue,
  42                 };
  43                 route_hints.push(RouteHint(vec![RouteHintHop {
  44                         src_node_id: channel.remote_network_id,
  45                         short_channel_id,
  46                         fees: RoutingFees {
  47                                 base_msat: forwarding_info.fee_base_msat,
  48                                 proportional_millionths: forwarding_info.fee_proportional_millionths,
  49                         },
  50                         cltv_expiry_delta: forwarding_info.cltv_expiry_delta,
  51                         htlc_minimum_msat: None,
  52                         htlc_maximum_msat: None,
  53                 }]));
  54         }
  55
  56         let (payment_hash, payment_secret) = channelmanager.create_inbound_payment(
  57                 amt_msat,
  58                 DEFAULT_EXPIRY_TIME.try_into().unwrap(),
  59                 0,
  60         );
  61         let our_node_pubkey = channelmanager.get_our_node_id();
  62         let mut invoice = InvoiceBuilder::new(network)
  63                 .description(description)
  64                 .current_timestamp()
  65                 .payee_pub_key(our_node_pubkey)
  66                 .payment_hash(Hash::from_slice(&payment_hash.0).unwrap())
  67                 .payment_secret(payment_secret)
  68                 .basic_mpp()
  69                 .min_final_cltv_expiry(MIN_FINAL_CLTV_EXPIRY.into());
  70         if let Some(amt) = amt_msat {
  71                 invoice = invoice.amount_pico_btc(amt * 10);
  72         }
  73         for hint in route_hints {
  74                 invoice = invoice.private_route(hint);
  75         }
  76
  77         let raw_invoice = match invoice.build_raw() {
  78                 Ok(inv) => inv,
  79                 Err(e) => return Err(SignOrCreationError::CreationError(e))
  80         };
  81         let hrp_str = raw_invoice.hrp.to_string();
  82         let hrp_bytes = hrp_str.as_bytes();
  83         let data_without_signature = raw_invoice.data.to_base32();
  84         let invoice_preimage = RawInvoice::construct_invoice_preimage(hrp_bytes, &data_without_signature);
  85         let signed_raw_invoice = raw_invoice.sign(|_| keys_manager.sign_invoice(invoice_preimage));
  86         match signed_raw_invoice {
  87                 Ok(inv) => Ok(Invoice::from_signed(inv).unwrap()),
  88                 Err(e) => Err(SignOrCreationError::SignError(e))
  89         }
  90 }
  91
  92 #[cfg(test)]
  93 mod test {
  94         use {Currency, Description, InvoiceDescription};
  95         use lightning::ln::PaymentHash;
  96         use lightning::ln::channelmanager::MIN_FINAL_CLTV_EXPIRY;
  97         use lightning::ln::functional_test_utils::*;
  98         use lightning::ln::features::InitFeatures;
  99         use lightning::ln::msgs::ChannelMessageHandler;
 100         use lightning::routing::router;
 101         use lightning::util::events::MessageSendEventsProvider;
 102         use lightning::util::test_utils;
 103         #[test]
 104         fn test_from_channelmanager() {
 105                 let chanmon_cfgs = create_chanmon_cfgs(2);
 106                 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 107                 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 108                 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 109                 let _chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 110                 let invoice = ::utils::create_invoice_from_channelmanager(&nodes[1].node, nodes[1].keys_manager, Currency::BitcoinTestnet, Some(10_000), "test".to_string()).unwrap();
 111                 assert_eq!(invoice.amount_pico_btc(), Some(100_000));
 112                 assert_eq!(invoice.min_final_cltv_expiry(), MIN_FINAL_CLTV_EXPIRY as u64);
 113                 assert_eq!(invoice.description(), InvoiceDescription::Direct(&Description("test".to_string())));
 114
 115                 let amt_msat = invoice.amount_pico_btc().unwrap() / 10;
 116                 let first_hops = nodes[0].node.list_usable_channels();
 117                 let last_hops = invoice.route_hints();
 118                 let network_graph = nodes[0].net_graph_msg_handler.network_graph.read().unwrap();
 119                 let logger = test_utils::TestLogger::new();
 120                 let route = router::get_route(
 121                         &nodes[0].node.get_our_node_id(),
 122                         &network_graph,
 123                         &invoice.recover_payee_pub_key(),
 124                         Some(invoice.features().unwrap().clone()),
 125                         Some(&first_hops.iter().collect::<Vec<_>>()),
 126                         &last_hops,
 127                         amt_msat,
 128                         invoice.min_final_cltv_expiry() as u32,
 129                         &logger,
 130                 ).unwrap();
 131
 132                 let payment_event = {
 133                         let mut payment_hash = PaymentHash([0; 32]);
 134                         payment_hash.0.copy_from_slice(&invoice.payment_hash().as_ref()[0..32]);
 135                         nodes[0].node.send_payment(&route, payment_hash, &Some(invoice.payment_secret().unwrap().clone())).unwrap();
 136                         let mut added_monitors = nodes[0].chain_monitor.added_monitors.lock().unwrap();
 137                         assert_eq!(added_monitors.len(), 1);
 138                         added_monitors.clear();
 139
 140                         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
 141                         assert_eq!(events.len(), 1);
 142                         SendEvent::from_event(events.remove(0))
 143
 144                 };
 145                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
 146                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &payment_event.commitment_msg);
 147                 let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
 148                 assert_eq!(added_monitors.len(), 1);
 149                 added_monitors.clear();
 150                 let events = nodes[1].node.get_and_clear_pending_msg_events();
 151                 assert_eq!(events.len(), 2);
 152         }
 153 }