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

   1 // This file is Copyright its original authors, visible in version control
   2 // history.
   3 //
   4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
   5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
   7 // You may not use this file except in accordance with one or both of these
   8 // licenses.
   9
  10 //! Data structures and encoding for `invoice` messages.
  11 //!
  12 //! An [`Invoice`] can be built from a parsed [`InvoiceRequest`] for the "offer to be paid" flow or
  13 //! from a [`Refund`] as an "offer for money" flow. The expected recipient of the payment then sends
  14 //! the invoice to the intended payer, who will then pay it.
  15 //!
  16 //! The payment recipient must include a [`PaymentHash`], so as to reveal the preimage upon payment
  17 //! receipt, and one or more [`BlindedPath`]s for the payer to use when sending the payment.
  18 //!
  19 //! ```
  20 //! extern crate bitcoin;
  21 //! extern crate lightning;
  22 //!
  23 //! use bitcoin::hashes::Hash;
  24 //! use bitcoin::secp256k1::{KeyPair, PublicKey, Secp256k1, SecretKey};
  25 //! use core::convert::{Infallible, TryFrom};
  26 //! use lightning::offers::invoice_request::InvoiceRequest;
  27 //! use lightning::offers::refund::Refund;
  28 //! use lightning::util::ser::Writeable;
  29 //!
  30 //! # use lightning::ln::PaymentHash;
  31 //! # use lightning::offers::invoice::BlindedPayInfo;
  32 //! # use lightning::onion_message::BlindedPath;
  33 //! #
  34 //! # fn create_payment_paths() -> Vec<(BlindedPath, BlindedPayInfo)> { unimplemented!() }
  35 //! # fn create_payment_hash() -> PaymentHash { unimplemented!() }
  36 //! #
  37 //! # fn parse_invoice_request(bytes: Vec<u8>) -> Result<(), lightning::offers::parse::ParseError> {
  38 //! let payment_paths = create_payment_paths();
  39 //! let payment_hash = create_payment_hash();
  40 //! let secp_ctx = Secp256k1::new();
  41 //! let keys = KeyPair::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32])?);
  42 //! let pubkey = PublicKey::from(keys);
  43 //! let wpubkey_hash = bitcoin::util::key::PublicKey::new(pubkey).wpubkey_hash().unwrap();
  44 //! let mut buffer = Vec::new();
  45 //!
  46 //! // Invoice for the "offer to be paid" flow.
  47 //! InvoiceRequest::try_from(bytes)?
  48 #![cfg_attr(feature = "std", doc = "
  49     .respond_with(payment_paths, payment_hash)?
  50 ")]
  51 #![cfg_attr(not(feature = "std"), doc = "
  52     .respond_with_no_std(payment_paths, payment_hash, core::time::Duration::from_secs(0))?
  53 ")]
  54 //!     .relative_expiry(3600)
  55 //!     .allow_mpp()
  56 //!     .fallback_v0_p2wpkh(&wpubkey_hash)
  57 //!     .build()?
  58 //!     .sign::<_, Infallible>(|digest| Ok(secp_ctx.sign_schnorr_no_aux_rand(digest, &keys)))
  59 //!     .expect("failed verifying signature")
  60 //!     .write(&mut buffer)
  61 //!     .unwrap();
  62 //! # Ok(())
  63 //! # }
  64 //!
  65 //! # fn parse_refund(bytes: Vec<u8>) -> Result<(), lightning::offers::parse::ParseError> {
  66 //! # let payment_paths = create_payment_paths();
  67 //! # let payment_hash = create_payment_hash();
  68 //! # let secp_ctx = Secp256k1::new();
  69 //! # let keys = KeyPair::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32])?);
  70 //! # let pubkey = PublicKey::from(keys);
  71 //! # let wpubkey_hash = bitcoin::util::key::PublicKey::new(pubkey).wpubkey_hash().unwrap();
  72 //! # let mut buffer = Vec::new();
  73 //!
  74 //! // Invoice for the "offer for money" flow.
  75 //! "lnr1qcp4256ypq"
  76 //!     .parse::<Refund>()?
  77 #![cfg_attr(feature = "std", doc = "
  78     .respond_with(payment_paths, payment_hash, pubkey)?
  79 ")]
  80 #![cfg_attr(not(feature = "std"), doc = "
  81     .respond_with_no_std(payment_paths, payment_hash, pubkey, core::time::Duration::from_secs(0))?
  82 ")]
  83 //!     .relative_expiry(3600)
  84 //!     .allow_mpp()
  85 //!     .fallback_v0_p2wpkh(&wpubkey_hash)
  86 //!     .build()?
  87 //!     .sign::<_, Infallible>(|digest| Ok(secp_ctx.sign_schnorr_no_aux_rand(digest, &keys)))
  88 //!     .expect("failed verifying signature")
  89 //!     .write(&mut buffer)
  90 //!     .unwrap();
  91 //! # Ok(())
  92 //! # }
  93 //!
  94 //! ```
  95
  96 use bitcoin::blockdata::constants::ChainHash;
  97 use bitcoin::hash_types::{WPubkeyHash, WScriptHash};
  98 use bitcoin::hashes::Hash;
  99 use bitcoin::network::constants::Network;
 100 use bitcoin::secp256k1::{Message, PublicKey};
 101 use bitcoin::secp256k1::schnorr::Signature;
 102 use bitcoin::util::address::{Address, Payload, WitnessVersion};
 103 use bitcoin::util::schnorr::TweakedPublicKey;
 104 use core::convert::TryFrom;
 105 use core::time::Duration;
 106 use crate::io;
 107 use crate::ln::PaymentHash;
 108 use crate::ln::features::{BlindedHopFeatures, Bolt12InvoiceFeatures};
 109 use crate::ln::msgs::DecodeError;
 110 use crate::offers::invoice_request::{InvoiceRequest, InvoiceRequestContents, InvoiceRequestTlvStream, InvoiceRequestTlvStreamRef};
 111 use crate::offers::merkle::{SignError, SignatureTlvStream, SignatureTlvStreamRef, WithoutSignatures, self};
 112 use crate::offers::offer::{Amount, OfferTlvStream, OfferTlvStreamRef};
 113 use crate::offers::parse::{ParseError, ParsedMessage, SemanticError};
 114 use crate::offers::payer::{PayerTlvStream, PayerTlvStreamRef};
 115 use crate::offers::refund::{Refund, RefundContents};
 116 use crate::onion_message::BlindedPath;
 117 use crate::util::ser::{HighZeroBytesDroppedBigSize, Iterable, SeekReadable, WithoutLength, Writeable, Writer};
 118
 119 use crate::prelude::*;
 120
 121 #[cfg(feature = "std")]
 122 use std::time::SystemTime;
 123
 124 const DEFAULT_RELATIVE_EXPIRY: Duration = Duration::from_secs(7200);
 125
 126 const SIGNATURE_TAG: &'static str = concat!("lightning", "invoice", "signature");
 127
 128 /// Builds an [`Invoice`] from either:
 129 /// - an [`InvoiceRequest`] for the "offer to be paid" flow or
 130 /// - a [`Refund`] for the "offer for money" flow.
 131 ///
 132 /// See [module-level documentation] for usage.
 133 ///
 134 /// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
 135 /// [`Refund`]: crate::offers::refund::Refund
 136 /// [module-level documentation]: self
 137 pub struct InvoiceBuilder<'a> {
 138         invreq_bytes: &'a Vec<u8>,
 139         invoice: InvoiceContents,
 140 }
 141
 142 impl<'a> InvoiceBuilder<'a> {
 143         pub(super) fn for_offer(
 144                 invoice_request: &'a InvoiceRequest, payment_paths: Vec<(BlindedPath, BlindedPayInfo)>,
 145                 created_at: Duration, payment_hash: PaymentHash
 146         ) -> Result<Self, SemanticError> {
 147                 let amount_msats = match invoice_request.amount_msats() {
 148                         Some(amount_msats) => amount_msats,
 149                         None => match invoice_request.contents.offer.amount() {
 150                                 Some(Amount::Bitcoin { amount_msats }) => {
 151                                         amount_msats * invoice_request.quantity().unwrap_or(1)
 152                                 },
 153                                 Some(Amount::Currency { .. }) => return Err(SemanticError::UnsupportedCurrency),
 154                                 None => return Err(SemanticError::MissingAmount),
 155                         },
 156                 };
 157
 158                 let contents = InvoiceContents::ForOffer {
 159                         invoice_request: invoice_request.contents.clone(),
 160                         fields: InvoiceFields {
 161                                 payment_paths, created_at, relative_expiry: None, payment_hash, amount_msats,
 162                                 fallbacks: None, features: Bolt12InvoiceFeatures::empty(),
 163                                 signing_pubkey: invoice_request.contents.offer.signing_pubkey(),
 164                         },
 165                 };
 166
 167                 Self::new(&invoice_request.bytes, contents)
 168         }
 169
 170         pub(super) fn for_refund(
 171                 refund: &'a Refund, payment_paths: Vec<(BlindedPath, BlindedPayInfo)>, created_at: Duration,
 172                 payment_hash: PaymentHash, signing_pubkey: PublicKey
 173         ) -> Result<Self, SemanticError> {
 174                 let contents = InvoiceContents::ForRefund {
 175                         refund: refund.contents.clone(),
 176                         fields: InvoiceFields {
 177                                 payment_paths, created_at, relative_expiry: None, payment_hash,
 178                                 amount_msats: refund.amount_msats(), fallbacks: None,
 179                                 features: Bolt12InvoiceFeatures::empty(), signing_pubkey,
 180                         },
 181                 };
 182
 183                 Self::new(&refund.bytes, contents)
 184         }
 185
 186         fn new(invreq_bytes: &'a Vec<u8>, contents: InvoiceContents) -> Result<Self, SemanticError> {
 187                 if contents.fields().payment_paths.is_empty() {
 188                         return Err(SemanticError::MissingPaths);
 189                 }
 190
 191                 Ok(Self { invreq_bytes, invoice: contents })
 192         }
 193
 194         /// Sets the [`Invoice::relative_expiry`] as seconds since [`Invoice::created_at`]. Any expiry
 195         /// that has already passed is valid and can be checked for using [`Invoice::is_expired`].
 196         ///
 197         /// Successive calls to this method will override the previous setting.
 198         pub fn relative_expiry(mut self, relative_expiry_secs: u32) -> Self {
 199                 let relative_expiry = Duration::from_secs(relative_expiry_secs as u64);
 200                 self.invoice.fields_mut().relative_expiry = Some(relative_expiry);
 201                 self
 202         }
 203
 204         /// Adds a P2WSH address to [`Invoice::fallbacks`].
 205         ///
 206         /// Successive calls to this method will add another address. Caller is responsible for not
 207         /// adding duplicate addresses and only calling if capable of receiving to P2WSH addresses.
 208         pub fn fallback_v0_p2wsh(mut self, script_hash: &WScriptHash) -> Self {
 209                 let address = FallbackAddress {
 210                         version: WitnessVersion::V0.to_num(),
 211                         program: Vec::from(&script_hash.into_inner()[..]),
 212                 };
 213                 self.invoice.fields_mut().fallbacks.get_or_insert_with(Vec::new).push(address);
 214                 self
 215         }
 216
 217         /// Adds a P2WPKH address to [`Invoice::fallbacks`].
 218         ///
 219         /// Successive calls to this method will add another address. Caller is responsible for not
 220         /// adding duplicate addresses and only calling if capable of receiving to P2WPKH addresses.
 221         pub fn fallback_v0_p2wpkh(mut self, pubkey_hash: &WPubkeyHash) -> Self {
 222                 let address = FallbackAddress {
 223                         version: WitnessVersion::V0.to_num(),
 224                         program: Vec::from(&pubkey_hash.into_inner()[..]),
 225                 };
 226                 self.invoice.fields_mut().fallbacks.get_or_insert_with(Vec::new).push(address);
 227                 self
 228         }
 229
 230         /// Adds a P2TR address to [`Invoice::fallbacks`].
 231         ///
 232         /// Successive calls to this method will add another address. Caller is responsible for not
 233         /// adding duplicate addresses and only calling if capable of receiving to P2TR addresses.
 234         pub fn fallback_v1_p2tr_tweaked(mut self, output_key: &TweakedPublicKey) -> Self {
 235                 let address = FallbackAddress {
 236                         version: WitnessVersion::V1.to_num(),
 237                         program: Vec::from(&output_key.serialize()[..]),
 238                 };
 239                 self.invoice.fields_mut().fallbacks.get_or_insert_with(Vec::new).push(address);
 240                 self
 241         }
 242
 243         /// Sets [`Invoice::features`] to indicate MPP may be used. Otherwise, MPP is disallowed.
 244         pub fn allow_mpp(mut self) -> Self {
 245                 self.invoice.fields_mut().features.set_basic_mpp_optional();
 246                 self
 247         }
 248
 249         /// Builds an unsigned [`Invoice`] after checking for valid semantics. It can be signed by
 250         /// [`UnsignedInvoice::sign`].
 251         pub fn build(self) -> Result<UnsignedInvoice<'a>, SemanticError> {
 252                 #[cfg(feature = "std")] {
 253                         if self.invoice.is_offer_or_refund_expired() {
 254                                 return Err(SemanticError::AlreadyExpired);
 255                         }
 256                 }
 257
 258                 let InvoiceBuilder { invreq_bytes, invoice } = self;
 259                 Ok(UnsignedInvoice { invreq_bytes, invoice })
 260         }
 261 }
 262
 263 /// A semantically valid [`Invoice`] that hasn't been signed.
 264 pub struct UnsignedInvoice<'a> {
 265         invreq_bytes: &'a Vec<u8>,
 266         invoice: InvoiceContents,
 267 }
 268
 269 impl<'a> UnsignedInvoice<'a> {
 270         /// The public key corresponding to the key needed to sign the invoice.
 271         pub fn signing_pubkey(&self) -> PublicKey {
 272                 self.invoice.fields().signing_pubkey
 273         }
 274
 275         /// Signs the invoice using the given function.
 276         pub fn sign<F, E>(self, sign: F) -> Result<Invoice, SignError<E>>
 277         where
 278                 F: FnOnce(&Message) -> Result<Signature, E>
 279         {
 280                 // Use the invoice_request bytes instead of the invoice_request TLV stream as the latter may
 281                 // have contained unknown TLV records, which are not stored in `InvoiceRequestContents` or
 282                 // `RefundContents`.
 283                 let (_, _, _, invoice_tlv_stream) = self.invoice.as_tlv_stream();
 284                 let invoice_request_bytes = WithoutSignatures(self.invreq_bytes);
 285                 let unsigned_tlv_stream = (invoice_request_bytes, invoice_tlv_stream);
 286
 287                 let mut bytes = Vec::new();
 288                 unsigned_tlv_stream.write(&mut bytes).unwrap();
 289
 290                 let pubkey = self.invoice.fields().signing_pubkey;
 291                 let signature = merkle::sign_message(sign, SIGNATURE_TAG, &bytes, pubkey)?;
 292
 293                 // Append the signature TLV record to the bytes.
 294                 let signature_tlv_stream = SignatureTlvStreamRef {
 295                         signature: Some(&signature),
 296                 };
 297                 signature_tlv_stream.write(&mut bytes).unwrap();
 298
 299                 Ok(Invoice {
 300                         bytes,
 301                         contents: self.invoice,
 302                         signature,
 303                 })
 304         }
 305 }
 306
 307 /// An `Invoice` is a payment request, typically corresponding to an [`Offer`] or a [`Refund`].
 308 ///
 309 /// An invoice may be sent in response to an [`InvoiceRequest`] in the case of an offer or sent
 310 /// directly after scanning a refund. It includes all the information needed to pay a recipient.
 311 ///
 312 /// [`Offer`]: crate::offers::offer::Offer
 313 /// [`Refund`]: crate::offers::refund::Refund
 314 /// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
 315 #[derive(Clone, Debug, PartialEq)]
 316 pub struct Invoice {
 317         bytes: Vec<u8>,
 318         contents: InvoiceContents,
 319         signature: Signature,
 320 }
 321
 322 /// The contents of an [`Invoice`] for responding to either an [`Offer`] or a [`Refund`].
 323 ///
 324 /// [`Offer`]: crate::offers::offer::Offer
 325 /// [`Refund`]: crate::offers::refund::Refund
 326 #[derive(Clone, Debug, PartialEq)]
 327 enum InvoiceContents {
 328         /// Contents for an [`Invoice`] corresponding to an [`Offer`].
 329         ///
 330         /// [`Offer`]: crate::offers::offer::Offer
 331         ForOffer {
 332                 invoice_request: InvoiceRequestContents,
 333                 fields: InvoiceFields,
 334         },
 335         /// Contents for an [`Invoice`] corresponding to a [`Refund`].
 336         ///
 337         /// [`Refund`]: crate::offers::refund::Refund
 338         ForRefund {
 339                 refund: RefundContents,
 340                 fields: InvoiceFields,
 341         },
 342 }
 343
 344 /// Invoice-specific fields for an `invoice` message.
 345 #[derive(Clone, Debug, PartialEq)]
 346 struct InvoiceFields {
 347         payment_paths: Vec<(BlindedPath, BlindedPayInfo)>,
 348         created_at: Duration,
 349         relative_expiry: Option<Duration>,
 350         payment_hash: PaymentHash,
 351         amount_msats: u64,
 352         fallbacks: Option<Vec<FallbackAddress>>,
 353         features: Bolt12InvoiceFeatures,
 354         signing_pubkey: PublicKey,
 355 }
 356
 357 impl Invoice {
 358         /// Paths to the recipient originating from publicly reachable nodes, including information
 359         /// needed for routing payments across them.
 360         ///
 361         /// Blinded paths provide recipient privacy by obfuscating its node id. Note, however, that this
 362         /// privacy is lost if a public node id is used for [`Invoice::signing_pubkey`].
 363         pub fn payment_paths(&self) -> &[(BlindedPath, BlindedPayInfo)] {
 364                 &self.contents.fields().payment_paths[..]
 365         }
 366
 367         /// Duration since the Unix epoch when the invoice was created.
 368         pub fn created_at(&self) -> Duration {
 369                 self.contents.fields().created_at
 370         }
 371
 372         /// Duration since [`Invoice::created_at`] when the invoice has expired and therefore should no
 373         /// longer be paid.
 374         pub fn relative_expiry(&self) -> Duration {
 375                 self.contents.fields().relative_expiry.unwrap_or(DEFAULT_RELATIVE_EXPIRY)
 376         }
 377
 378         /// Whether the invoice has expired.
 379         #[cfg(feature = "std")]
 380         pub fn is_expired(&self) -> bool {
 381                 let absolute_expiry = self.created_at().checked_add(self.relative_expiry());
 382                 match absolute_expiry {
 383                         Some(seconds_from_epoch) => match SystemTime::UNIX_EPOCH.elapsed() {
 384                                 Ok(elapsed) => elapsed > seconds_from_epoch,
 385                                 Err(_) => false,
 386                         },
 387                         None => false,
 388                 }
 389         }
 390
 391         /// SHA256 hash of the payment preimage that will be given in return for paying the invoice.
 392         pub fn payment_hash(&self) -> PaymentHash {
 393                 self.contents.fields().payment_hash
 394         }
 395
 396         /// The minimum amount required for a successful payment of the invoice.
 397         pub fn amount_msats(&self) -> u64 {
 398                 self.contents.fields().amount_msats
 399         }
 400
 401         /// Fallback addresses for paying the invoice on-chain, in order of most-preferred to
 402         /// least-preferred.
 403         pub fn fallbacks(&self) -> Vec<Address> {
 404                 let network = match self.network() {
 405                         None => return Vec::new(),
 406                         Some(network) => network,
 407                 };
 408
 409                 let to_valid_address = |address: &FallbackAddress| {
 410                         let version = match WitnessVersion::try_from(address.version) {
 411                                 Ok(version) => version,
 412                                 Err(_) => return None,
 413                         };
 414
 415                         let program = &address.program;
 416                         if program.len() < 2 || program.len() > 40 {
 417                                 return None;
 418                         }
 419
 420                         let address = Address {
 421                                 payload: Payload::WitnessProgram {
 422                                         version,
 423                                         program: address.program.clone(),
 424                                 },
 425                                 network,
 426                         };
 427
 428                         if !address.is_standard() && version == WitnessVersion::V0 {
 429                                 return None;
 430                         }
 431
 432                         Some(address)
 433                 };
 434
 435                 self.contents.fields().fallbacks
 436                         .as_ref()
 437                         .map(|fallbacks| fallbacks.iter().filter_map(to_valid_address).collect())
 438                         .unwrap_or_else(Vec::new)
 439         }
 440
 441         fn network(&self) -> Option<Network> {
 442                 let chain = self.contents.chain();
 443                 if chain == ChainHash::using_genesis_block(Network::Bitcoin) {
 444                         Some(Network::Bitcoin)
 445                 } else if chain == ChainHash::using_genesis_block(Network::Testnet) {
 446                         Some(Network::Testnet)
 447                 } else if chain == ChainHash::using_genesis_block(Network::Signet) {
 448                         Some(Network::Signet)
 449                 } else if chain == ChainHash::using_genesis_block(Network::Regtest) {
 450                         Some(Network::Regtest)
 451                 } else {
 452                         None
 453                 }
 454         }
 455
 456         /// Features pertaining to paying an invoice.
 457         pub fn features(&self) -> &Bolt12InvoiceFeatures {
 458                 &self.contents.fields().features
 459         }
 460
 461         /// The public key corresponding to the key used to sign the invoice.
 462         pub fn signing_pubkey(&self) -> PublicKey {
 463                 self.contents.fields().signing_pubkey
 464         }
 465
 466         /// Signature of the invoice verified using [`Invoice::signing_pubkey`].
 467         pub fn signature(&self) -> Signature {
 468                 self.signature
 469         }
 470
 471         #[cfg(test)]
 472         fn as_tlv_stream(&self) -> FullInvoiceTlvStreamRef {
 473                 let (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream) =
 474                         self.contents.as_tlv_stream();
 475                 let signature_tlv_stream = SignatureTlvStreamRef {
 476                         signature: Some(&self.signature),
 477                 };
 478                 (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream,
 479                  signature_tlv_stream)
 480         }
 481 }
 482
 483 impl InvoiceContents {
 484         /// Whether the original offer or refund has expired.
 485         #[cfg(feature = "std")]
 486         fn is_offer_or_refund_expired(&self) -> bool {
 487                 match self {
 488                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.offer.is_expired(),
 489                         InvoiceContents::ForRefund { refund, .. } => refund.is_expired(),
 490                 }
 491         }
 492
 493         fn chain(&self) -> ChainHash {
 494                 match self {
 495                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.chain(),
 496                         InvoiceContents::ForRefund { refund, .. } => refund.chain(),
 497                 }
 498         }
 499
 500         fn fields(&self) -> &InvoiceFields {
 501                 match self {
 502                         InvoiceContents::ForOffer { fields, .. } => fields,
 503                         InvoiceContents::ForRefund { fields, .. } => fields,
 504                 }
 505         }
 506
 507         fn fields_mut(&mut self) -> &mut InvoiceFields {
 508                 match self {
 509                         InvoiceContents::ForOffer { fields, .. } => fields,
 510                         InvoiceContents::ForRefund { fields, .. } => fields,
 511                 }
 512         }
 513
 514         fn as_tlv_stream(&self) -> PartialInvoiceTlvStreamRef {
 515                 let (payer, offer, invoice_request) = match self {
 516                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.as_tlv_stream(),
 517                         InvoiceContents::ForRefund { refund, .. } => refund.as_tlv_stream(),
 518                 };
 519                 let invoice = self.fields().as_tlv_stream();
 520
 521                 (payer, offer, invoice_request, invoice)
 522         }
 523 }
 524
 525 impl InvoiceFields {
 526         fn as_tlv_stream(&self) -> InvoiceTlvStreamRef {
 527                 let features = {
 528                         if self.features == Bolt12InvoiceFeatures::empty() { None }
 529                         else { Some(&self.features) }
 530                 };
 531
 532                 InvoiceTlvStreamRef {
 533                         paths: Some(Iterable(self.payment_paths.iter().map(|(path, _)| path))),
 534                         blindedpay: Some(Iterable(self.payment_paths.iter().map(|(_, payinfo)| payinfo))),
 535                         created_at: Some(self.created_at.as_secs()),
 536                         relative_expiry: self.relative_expiry.map(|duration| duration.as_secs() as u32),
 537                         payment_hash: Some(&self.payment_hash),
 538                         amount: Some(self.amount_msats),
 539                         fallbacks: self.fallbacks.as_ref(),
 540                         features,
 541                         node_id: Some(&self.signing_pubkey),
 542                 }
 543         }
 544 }
 545
 546 impl Writeable for Invoice {
 547         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 548                 WithoutLength(&self.bytes).write(writer)
 549         }
 550 }
 551
 552 impl Writeable for InvoiceContents {
 553         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 554                 self.as_tlv_stream().write(writer)
 555         }
 556 }
 557
 558 impl TryFrom<Vec<u8>> for Invoice {
 559         type Error = ParseError;
 560
 561         fn try_from(bytes: Vec<u8>) -> Result<Self, Self::Error> {
 562                 let parsed_invoice = ParsedMessage::<FullInvoiceTlvStream>::try_from(bytes)?;
 563                 Invoice::try_from(parsed_invoice)
 564         }
 565 }
 566
 567 tlv_stream!(InvoiceTlvStream, InvoiceTlvStreamRef, 160..240, {
 568         (160, paths: (Vec<BlindedPath>, WithoutLength, Iterable<'a, BlindedPathIter<'a>, BlindedPath>)),
 569         (162, blindedpay: (Vec<BlindedPayInfo>, WithoutLength, Iterable<'a, BlindedPayInfoIter<'a>, BlindedPayInfo>)),
 570         (164, created_at: (u64, HighZeroBytesDroppedBigSize)),
 571         (166, relative_expiry: (u32, HighZeroBytesDroppedBigSize)),
 572         (168, payment_hash: PaymentHash),
 573         (170, amount: (u64, HighZeroBytesDroppedBigSize)),
 574         (172, fallbacks: (Vec<FallbackAddress>, WithoutLength)),
 575         (174, features: (Bolt12InvoiceFeatures, WithoutLength)),
 576         (176, node_id: PublicKey),
 577 });
 578
 579 type BlindedPathIter<'a> = core::iter::Map<
 580         core::slice::Iter<'a, (BlindedPath, BlindedPayInfo)>,
 581         for<'r> fn(&'r (BlindedPath, BlindedPayInfo)) -> &'r BlindedPath,
 582 >;
 583
 584 type BlindedPayInfoIter<'a> = core::iter::Map<
 585         core::slice::Iter<'a, (BlindedPath, BlindedPayInfo)>,
 586         for<'r> fn(&'r (BlindedPath, BlindedPayInfo)) -> &'r BlindedPayInfo,
 587 >;
 588
 589 /// Information needed to route a payment across a [`BlindedPath`].
 590 #[derive(Clone, Debug, PartialEq)]
 591 pub struct BlindedPayInfo {
 592         /// Base fee charged (in millisatoshi) for the entire blinded path.
 593         pub fee_base_msat: u32,
 594
 595         /// Liquidity fee charged (in millionths of the amount transferred) for the entire blinded path
 596         /// (i.e., 10,000 is 1%).
 597         pub fee_proportional_millionths: u32,
 598
 599         /// Number of blocks subtracted from an incoming HTLC's `cltv_expiry` for the entire blinded
 600         /// path.
 601         pub cltv_expiry_delta: u16,
 602
 603         /// The minimum HTLC value (in millisatoshi) that is acceptable to all channel peers on the
 604         /// blinded path from the introduction node to the recipient, accounting for any fees, i.e., as
 605         /// seen by the recipient.
 606         pub htlc_minimum_msat: u64,
 607
 608         /// The maximum HTLC value (in millisatoshi) that is acceptable to all channel peers on the
 609         /// blinded path from the introduction node to the recipient, accounting for any fees, i.e., as
 610         /// seen by the recipient.
 611         pub htlc_maximum_msat: u64,
 612
 613         /// Features set in `encrypted_data_tlv` for the `encrypted_recipient_data` TLV record in an
 614         /// onion payload.
 615         pub features: BlindedHopFeatures,
 616 }
 617
 618 impl_writeable!(BlindedPayInfo, {
 619         fee_base_msat,
 620         fee_proportional_millionths,
 621         cltv_expiry_delta,
 622         htlc_minimum_msat,
 623         htlc_maximum_msat,
 624         features
 625 });
 626
 627 /// Wire representation for an on-chain fallback address.
 628 #[derive(Clone, Debug, PartialEq)]
 629 pub(super) struct FallbackAddress {
 630         version: u8,
 631         program: Vec<u8>,
 632 }
 633
 634 impl_writeable!(FallbackAddress, { version, program });
 635
 636 type FullInvoiceTlvStream =
 637         (PayerTlvStream, OfferTlvStream, InvoiceRequestTlvStream, InvoiceTlvStream, SignatureTlvStream);
 638
 639 #[cfg(test)]
 640 type FullInvoiceTlvStreamRef<'a> = (
 641         PayerTlvStreamRef<'a>,
 642         OfferTlvStreamRef<'a>,
 643         InvoiceRequestTlvStreamRef<'a>,
 644         InvoiceTlvStreamRef<'a>,
 645         SignatureTlvStreamRef<'a>,
 646 );
 647
 648 impl SeekReadable for FullInvoiceTlvStream {
 649         fn read<R: io::Read + io::Seek>(r: &mut R) -> Result<Self, DecodeError> {
 650                 let payer = SeekReadable::read(r)?;
 651                 let offer = SeekReadable::read(r)?;
 652                 let invoice_request = SeekReadable::read(r)?;
 653                 let invoice = SeekReadable::read(r)?;
 654                 let signature = SeekReadable::read(r)?;
 655
 656                 Ok((payer, offer, invoice_request, invoice, signature))
 657         }
 658 }
 659
 660 type PartialInvoiceTlvStream =
 661         (PayerTlvStream, OfferTlvStream, InvoiceRequestTlvStream, InvoiceTlvStream);
 662
 663 type PartialInvoiceTlvStreamRef<'a> = (
 664         PayerTlvStreamRef<'a>,
 665         OfferTlvStreamRef<'a>,
 666         InvoiceRequestTlvStreamRef<'a>,
 667         InvoiceTlvStreamRef<'a>,
 668 );
 669
 670 impl TryFrom<ParsedMessage<FullInvoiceTlvStream>> for Invoice {
 671         type Error = ParseError;
 672
 673         fn try_from(invoice: ParsedMessage<FullInvoiceTlvStream>) -> Result<Self, Self::Error> {
 674                 let ParsedMessage { bytes, tlv_stream } = invoice;
 675                 let (
 676                         payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream,
 677                         SignatureTlvStream { signature },
 678                 ) = tlv_stream;
 679                 let contents = InvoiceContents::try_from(
 680                         (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream)
 681                 )?;
 682
 683                 let signature = match signature {
 684                         None => return Err(ParseError::InvalidSemantics(SemanticError::MissingSignature)),
 685                         Some(signature) => signature,
 686                 };
 687                 let pubkey = contents.fields().signing_pubkey;
 688                 merkle::verify_signature(&signature, SIGNATURE_TAG, &bytes, pubkey)?;
 689
 690                 Ok(Invoice { bytes, contents, signature })
 691         }
 692 }
 693
 694 impl TryFrom<PartialInvoiceTlvStream> for InvoiceContents {
 695         type Error = SemanticError;
 696
 697         fn try_from(tlv_stream: PartialInvoiceTlvStream) -> Result<Self, Self::Error> {
 698                 let (
 699                         payer_tlv_stream,
 700                         offer_tlv_stream,
 701                         invoice_request_tlv_stream,
 702                         InvoiceTlvStream {
 703                                 paths, blindedpay, created_at, relative_expiry, payment_hash, amount, fallbacks,
 704                                 features, node_id,
 705                         },
 706                 ) = tlv_stream;
 707
 708                 let payment_paths = match (paths, blindedpay) {
 709                         (None, _) => return Err(SemanticError::MissingPaths),
 710                         (_, None) => return Err(SemanticError::InvalidPayInfo),
 711                         (Some(paths), _) if paths.is_empty() => return Err(SemanticError::MissingPaths),
 712                         (Some(paths), Some(blindedpay)) if paths.len() != blindedpay.len() => {
 713                                 return Err(SemanticError::InvalidPayInfo);
 714                         },
 715                         (Some(paths), Some(blindedpay)) => {
 716                                 paths.into_iter().zip(blindedpay.into_iter()).collect::<Vec<_>>()
 717                         },
 718                 };
 719
 720                 let created_at = match created_at {
 721                         None => return Err(SemanticError::MissingCreationTime),
 722                         Some(timestamp) => Duration::from_secs(timestamp),
 723                 };
 724
 725                 let relative_expiry = relative_expiry
 726                         .map(Into::<u64>::into)
 727                         .map(Duration::from_secs);
 728
 729                 let payment_hash = match payment_hash {
 730                         None => return Err(SemanticError::MissingPaymentHash),
 731                         Some(payment_hash) => payment_hash,
 732                 };
 733
 734                 let amount_msats = match amount {
 735                         None => return Err(SemanticError::MissingAmount),
 736                         Some(amount) => amount,
 737                 };
 738
 739                 let features = features.unwrap_or_else(Bolt12InvoiceFeatures::empty);
 740
 741                 let signing_pubkey = match node_id {
 742                         None => return Err(SemanticError::MissingSigningPubkey),
 743                         Some(node_id) => node_id,
 744                 };
 745
 746                 let fields = InvoiceFields {
 747                         payment_paths, created_at, relative_expiry, payment_hash, amount_msats, fallbacks,
 748                         features, signing_pubkey,
 749                 };
 750
 751                 match offer_tlv_stream.node_id {
 752                         Some(expected_signing_pubkey) => {
 753                                 if fields.signing_pubkey != expected_signing_pubkey {
 754                                         return Err(SemanticError::InvalidSigningPubkey);
 755                                 }
 756
 757                                 let invoice_request = InvoiceRequestContents::try_from(
 758                                         (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream)
 759                                 )?;
 760                                 Ok(InvoiceContents::ForOffer { invoice_request, fields })
 761                         },
 762                         None => {
 763                                 let refund = RefundContents::try_from(
 764                                         (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream)
 765                                 )?;
 766                                 Ok(InvoiceContents::ForRefund { refund, fields })
 767                         },
 768                 }
 769         }
 770 }
 771
 772 #[cfg(test)]
 773 mod tests {
 774         use super::{DEFAULT_RELATIVE_EXPIRY, BlindedPayInfo, FallbackAddress, FullInvoiceTlvStreamRef, Invoice, InvoiceTlvStreamRef, SIGNATURE_TAG};
 775
 776         use bitcoin::blockdata::script::Script;
 777         use bitcoin::hashes::Hash;
 778         use bitcoin::network::constants::Network;
 779         use bitcoin::secp256k1::{KeyPair, Message, PublicKey, Secp256k1, SecretKey, XOnlyPublicKey, self};
 780         use bitcoin::secp256k1::schnorr::Signature;
 781         use bitcoin::util::address::{Address, Payload, WitnessVersion};
 782         use bitcoin::util::schnorr::TweakedPublicKey;
 783         use core::convert::{Infallible, TryFrom};
 784         use core::time::Duration;
 785         use crate::ln::PaymentHash;
 786         use crate::ln::msgs::DecodeError;
 787         use crate::ln::features::{BlindedHopFeatures, Bolt12InvoiceFeatures};
 788         use crate::offers::invoice_request::InvoiceRequestTlvStreamRef;
 789         use crate::offers::merkle::{SignError, SignatureTlvStreamRef, self};
 790         use crate::offers::offer::{OfferBuilder, OfferTlvStreamRef};
 791         use crate::offers::parse::{ParseError, SemanticError};
 792         use crate::offers::payer::PayerTlvStreamRef;
 793         use crate::offers::refund::RefundBuilder;
 794         use crate::onion_message::{BlindedHop, BlindedPath};
 795         use crate::util::ser::{BigSize, Iterable, Writeable};
 796
 797         fn payer_keys() -> KeyPair {
 798                 let secp_ctx = Secp256k1::new();
 799                 KeyPair::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap())
 800         }
 801
 802         fn payer_sign(digest: &Message) -> Result<Signature, Infallible> {
 803                 let secp_ctx = Secp256k1::new();
 804                 let keys = KeyPair::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
 805                 Ok(secp_ctx.sign_schnorr_no_aux_rand(digest, &keys))
 806         }
 807
 808         fn payer_pubkey() -> PublicKey {
 809                 payer_keys().public_key()
 810         }
 811
 812         fn recipient_keys() -> KeyPair {
 813                 let secp_ctx = Secp256k1::new();
 814                 KeyPair::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[43; 32]).unwrap())
 815         }
 816
 817         fn recipient_sign(digest: &Message) -> Result<Signature, Infallible> {
 818                 let secp_ctx = Secp256k1::new();
 819                 let keys = KeyPair::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[43; 32]).unwrap());
 820                 Ok(secp_ctx.sign_schnorr_no_aux_rand(digest, &keys))
 821         }
 822
 823         fn recipient_pubkey() -> PublicKey {
 824                 recipient_keys().public_key()
 825         }
 826
 827         fn pubkey(byte: u8) -> PublicKey {
 828                 let secp_ctx = Secp256k1::new();
 829                 PublicKey::from_secret_key(&secp_ctx, &privkey(byte))
 830         }
 831
 832         fn privkey(byte: u8) -> SecretKey {
 833                 SecretKey::from_slice(&[byte; 32]).unwrap()
 834         }
 835
 836         trait ToBytes {
 837                 fn to_bytes(&self) -> Vec<u8>;
 838         }
 839
 840         impl<'a> ToBytes for FullInvoiceTlvStreamRef<'a> {
 841                 fn to_bytes(&self) -> Vec<u8> {
 842                         let mut buffer = Vec::new();
 843                         self.0.write(&mut buffer).unwrap();
 844                         self.1.write(&mut buffer).unwrap();
 845                         self.2.write(&mut buffer).unwrap();
 846                         self.3.write(&mut buffer).unwrap();
 847                         self.4.write(&mut buffer).unwrap();
 848                         buffer
 849                 }
 850         }
 851
 852         fn payment_paths() -> Vec<(BlindedPath, BlindedPayInfo)> {
 853                 let paths = vec![
 854                         BlindedPath {
 855                                 introduction_node_id: pubkey(40),
 856                                 blinding_point: pubkey(41),
 857                                 blinded_hops: vec![
 858                                         BlindedHop { blinded_node_id: pubkey(43), encrypted_payload: vec![0; 43] },
 859                                         BlindedHop { blinded_node_id: pubkey(44), encrypted_payload: vec![0; 44] },
 860                                 ],
 861                         },
 862                         BlindedPath {
 863                                 introduction_node_id: pubkey(40),
 864                                 blinding_point: pubkey(41),
 865                                 blinded_hops: vec![
 866                                         BlindedHop { blinded_node_id: pubkey(45), encrypted_payload: vec![0; 45] },
 867                                         BlindedHop { blinded_node_id: pubkey(46), encrypted_payload: vec![0; 46] },
 868                                 ],
 869                         },
 870                 ];
 871
 872                 let payinfo = vec![
 873                         BlindedPayInfo {
 874                                 fee_base_msat: 1,
 875                                 fee_proportional_millionths: 1_000,
 876                                 cltv_expiry_delta: 42,
 877                                 htlc_minimum_msat: 100,
 878                                 htlc_maximum_msat: 1_000_000_000_000,
 879                                 features: BlindedHopFeatures::empty(),
 880                         },
 881                         BlindedPayInfo {
 882                                 fee_base_msat: 1,
 883                                 fee_proportional_millionths: 1_000,
 884                                 cltv_expiry_delta: 42,
 885                                 htlc_minimum_msat: 100,
 886                                 htlc_maximum_msat: 1_000_000_000_000,
 887                                 features: BlindedHopFeatures::empty(),
 888                         },
 889                 ];
 890
 891                 paths.into_iter().zip(payinfo.into_iter()).collect()
 892         }
 893
 894         fn payment_hash() -> PaymentHash {
 895                 PaymentHash([42; 32])
 896         }
 897
 898         fn now() -> Duration {
 899                 std::time::SystemTime::now()
 900                         .duration_since(std::time::SystemTime::UNIX_EPOCH)
 901                         .expect("SystemTime::now() should come after SystemTime::UNIX_EPOCH")
 902         }
 903
 904         #[test]
 905         fn builds_invoice_for_offer_with_defaults() {
 906                 let payment_paths = payment_paths();
 907                 let payment_hash = payment_hash();
 908                 let now = now();
 909                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
 910                         .amount_msats(1000)
 911                         .build().unwrap()
 912                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
 913                         .build().unwrap()
 914                         .sign(payer_sign).unwrap()
 915                         .respond_with_no_std(payment_paths.clone(), payment_hash, now).unwrap()
 916                         .build().unwrap()
 917                         .sign(recipient_sign).unwrap();
 918
 919                 let mut buffer = Vec::new();
 920                 invoice.write(&mut buffer).unwrap();
 921
 922                 assert_eq!(invoice.bytes, buffer.as_slice());
 923                 assert_eq!(invoice.payment_paths(), payment_paths.as_slice());
 924                 assert_eq!(invoice.created_at(), now);
 925                 assert_eq!(invoice.relative_expiry(), DEFAULT_RELATIVE_EXPIRY);
 926                 #[cfg(feature = "std")]
 927                 assert!(!invoice.is_expired());
 928                 assert_eq!(invoice.payment_hash(), payment_hash);
 929                 assert_eq!(invoice.amount_msats(), 1000);
 930                 assert_eq!(invoice.fallbacks(), vec![]);
 931                 assert_eq!(invoice.features(), &Bolt12InvoiceFeatures::empty());
 932                 assert_eq!(invoice.signing_pubkey(), recipient_pubkey());
 933                 assert!(
 934                         merkle::verify_signature(
 935                                 &invoice.signature, SIGNATURE_TAG, &invoice.bytes, recipient_pubkey()
 936                         ).is_ok()
 937                 );
 938
 939                 assert_eq!(
 940                         invoice.as_tlv_stream(),
 941                         (
 942                                 PayerTlvStreamRef { metadata: Some(&vec![1; 32]) },
 943                                 OfferTlvStreamRef {
 944                                         chains: None,
 945                                         metadata: None,
 946                                         currency: None,
 947                                         amount: Some(1000),
 948                                         description: Some(&String::from("foo")),
 949                                         features: None,
 950                                         absolute_expiry: None,
 951                                         paths: None,
 952                                         issuer: None,
 953                                         quantity_max: None,
 954                                         node_id: Some(&recipient_pubkey()),
 955                                 },
 956                                 InvoiceRequestTlvStreamRef {
 957                                         chain: None,
 958                                         amount: None,
 959                                         features: None,
 960                                         quantity: None,
 961                                         payer_id: Some(&payer_pubkey()),
 962                                         payer_note: None,
 963                                 },
 964                                 InvoiceTlvStreamRef {
 965                                         paths: Some(Iterable(payment_paths.iter().map(|(path, _)| path))),
 966                                         blindedpay: Some(Iterable(payment_paths.iter().map(|(_, payinfo)| payinfo))),
 967                                         created_at: Some(now.as_secs()),
 968                                         relative_expiry: None,
 969                                         payment_hash: Some(&payment_hash),
 970                                         amount: Some(1000),
 971                                         fallbacks: None,
 972                                         features: None,
 973                                         node_id: Some(&recipient_pubkey()),
 974                                 },
 975                                 SignatureTlvStreamRef { signature: Some(&invoice.signature()) },
 976                         ),
 977                 );
 978
 979                 if let Err(e) = Invoice::try_from(buffer) {
 980                         panic!("error parsing invoice: {:?}", e);
 981                 }
 982         }
 983
 984         #[test]
 985         fn builds_invoice_for_refund_with_defaults() {
 986                 let payment_paths = payment_paths();
 987                 let payment_hash = payment_hash();
 988                 let now = now();
 989                 let invoice = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
 990                         .build().unwrap()
 991                         .respond_with_no_std(payment_paths.clone(), payment_hash, recipient_pubkey(), now)
 992                         .unwrap()
 993                         .build().unwrap()
 994                         .sign(recipient_sign).unwrap();
 995
 996                 let mut buffer = Vec::new();
 997                 invoice.write(&mut buffer).unwrap();
 998
 999                 assert_eq!(invoice.bytes, buffer.as_slice());
1000                 assert_eq!(invoice.payment_paths(), payment_paths.as_slice());
1001                 assert_eq!(invoice.created_at(), now);
1002                 assert_eq!(invoice.relative_expiry(), DEFAULT_RELATIVE_EXPIRY);
1003                 #[cfg(feature = "std")]
1004                 assert!(!invoice.is_expired());
1005                 assert_eq!(invoice.payment_hash(), payment_hash);
1006                 assert_eq!(invoice.amount_msats(), 1000);
1007                 assert_eq!(invoice.fallbacks(), vec![]);
1008                 assert_eq!(invoice.features(), &Bolt12InvoiceFeatures::empty());
1009                 assert_eq!(invoice.signing_pubkey(), recipient_pubkey());
1010                 assert!(
1011                         merkle::verify_signature(
1012                                 &invoice.signature, SIGNATURE_TAG, &invoice.bytes, recipient_pubkey()
1013                         ).is_ok()
1014                 );
1015
1016                 assert_eq!(
1017                         invoice.as_tlv_stream(),
1018                         (
1019                                 PayerTlvStreamRef { metadata: Some(&vec![1; 32]) },
1020                                 OfferTlvStreamRef {
1021                                         chains: None,
1022                                         metadata: None,
1023                                         currency: None,
1024                                         amount: None,
1025                                         description: Some(&String::from("foo")),
1026                                         features: None,
1027                                         absolute_expiry: None,
1028                                         paths: None,
1029                                         issuer: None,
1030                                         quantity_max: None,
1031                                         node_id: None,
1032                                 },
1033                                 InvoiceRequestTlvStreamRef {
1034                                         chain: None,
1035                                         amount: Some(1000),
1036                                         features: None,
1037                                         quantity: None,
1038                                         payer_id: Some(&payer_pubkey()),
1039                                         payer_note: None,
1040                                 },
1041                                 InvoiceTlvStreamRef {
1042                                         paths: Some(Iterable(payment_paths.iter().map(|(path, _)| path))),
1043                                         blindedpay: Some(Iterable(payment_paths.iter().map(|(_, payinfo)| payinfo))),
1044                                         created_at: Some(now.as_secs()),
1045                                         relative_expiry: None,
1046                                         payment_hash: Some(&payment_hash),
1047                                         amount: Some(1000),
1048                                         fallbacks: None,
1049                                         features: None,
1050                                         node_id: Some(&recipient_pubkey()),
1051                                 },
1052                                 SignatureTlvStreamRef { signature: Some(&invoice.signature()) },
1053                         ),
1054                 );
1055
1056                 if let Err(e) = Invoice::try_from(buffer) {
1057                         panic!("error parsing invoice: {:?}", e);
1058                 }
1059         }
1060
1061         #[cfg(feature = "std")]
1062         #[test]
1063         fn builds_invoice_from_offer_with_expiration() {
1064                 let future_expiry = Duration::from_secs(u64::max_value());
1065                 let past_expiry = Duration::from_secs(0);
1066
1067                 if let Err(e) = OfferBuilder::new("foo".into(), recipient_pubkey())
1068                         .amount_msats(1000)
1069                         .absolute_expiry(future_expiry)
1070                         .build().unwrap()
1071                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1072                         .build().unwrap()
1073                         .sign(payer_sign).unwrap()
1074                         .respond_with(payment_paths(), payment_hash())
1075                         .unwrap()
1076                         .build()
1077                 {
1078                         panic!("error building invoice: {:?}", e);
1079                 }
1080
1081                 match OfferBuilder::new("foo".into(), recipient_pubkey())
1082                         .amount_msats(1000)
1083                         .absolute_expiry(past_expiry)
1084                         .build().unwrap()
1085                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1086                         .build_unchecked()
1087                         .sign(payer_sign).unwrap()
1088                         .respond_with(payment_paths(), payment_hash())
1089                         .unwrap()
1090                         .build()
1091                 {
1092                         Ok(_) => panic!("expected error"),
1093                         Err(e) => assert_eq!(e, SemanticError::AlreadyExpired),
1094                 }
1095         }
1096
1097         #[cfg(feature = "std")]
1098         #[test]
1099         fn builds_invoice_from_refund_with_expiration() {
1100                 let future_expiry = Duration::from_secs(u64::max_value());
1101                 let past_expiry = Duration::from_secs(0);
1102
1103                 if let Err(e) = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1104                         .absolute_expiry(future_expiry)
1105                         .build().unwrap()
1106                         .respond_with(payment_paths(), payment_hash(), recipient_pubkey())
1107                         .unwrap()
1108                         .build()
1109                 {
1110                         panic!("error building invoice: {:?}", e);
1111                 }
1112
1113                 match RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1114                         .absolute_expiry(past_expiry)
1115                         .build().unwrap()
1116                         .respond_with(payment_paths(), payment_hash(), recipient_pubkey())
1117                         .unwrap()
1118                         .build()
1119                 {
1120                         Ok(_) => panic!("expected error"),
1121                         Err(e) => assert_eq!(e, SemanticError::AlreadyExpired),
1122                 }
1123         }
1124
1125         #[test]
1126         fn builds_invoice_with_relative_expiry() {
1127                 let now = now();
1128                 let one_hour = Duration::from_secs(3600);
1129
1130                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1131                         .amount_msats(1000)
1132                         .build().unwrap()
1133                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1134                         .build().unwrap()
1135                         .sign(payer_sign).unwrap()
1136                         .respond_with_no_std(payment_paths(), payment_hash(), now).unwrap()
1137                         .relative_expiry(one_hour.as_secs() as u32)
1138                         .build().unwrap()
1139                         .sign(recipient_sign).unwrap();
1140                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1141                 #[cfg(feature = "std")]
1142                 assert!(!invoice.is_expired());
1143                 assert_eq!(invoice.relative_expiry(), one_hour);
1144                 assert_eq!(tlv_stream.relative_expiry, Some(one_hour.as_secs() as u32));
1145
1146                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1147                         .amount_msats(1000)
1148                         .build().unwrap()
1149                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1150                         .build().unwrap()
1151                         .sign(payer_sign).unwrap()
1152                         .respond_with_no_std(payment_paths(), payment_hash(), now - one_hour).unwrap()
1153                         .relative_expiry(one_hour.as_secs() as u32 - 1)
1154                         .build().unwrap()
1155                         .sign(recipient_sign).unwrap();
1156                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1157                 #[cfg(feature = "std")]
1158                 assert!(invoice.is_expired());
1159                 assert_eq!(invoice.relative_expiry(), one_hour - Duration::from_secs(1));
1160                 assert_eq!(tlv_stream.relative_expiry, Some(one_hour.as_secs() as u32 - 1));
1161         }
1162
1163         #[test]
1164         fn builds_invoice_with_amount_from_request() {
1165                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1166                         .amount_msats(1000)
1167                         .build().unwrap()
1168                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1169                         .amount_msats(1001).unwrap()
1170                         .build().unwrap()
1171                         .sign(payer_sign).unwrap()
1172                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1173                         .build().unwrap()
1174                         .sign(recipient_sign).unwrap();
1175                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1176                 assert_eq!(invoice.amount_msats(), 1001);
1177                 assert_eq!(tlv_stream.amount, Some(1001));
1178         }
1179
1180         #[test]
1181         fn builds_invoice_with_fallback_address() {
1182                 let script = Script::new();
1183                 let pubkey = bitcoin::util::key::PublicKey::new(recipient_pubkey());
1184                 let x_only_pubkey = XOnlyPublicKey::from_keypair(&recipient_keys()).0;
1185                 let tweaked_pubkey = TweakedPublicKey::dangerous_assume_tweaked(x_only_pubkey);
1186
1187                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1188                         .amount_msats(1000)
1189                         .build().unwrap()
1190                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1191                         .build().unwrap()
1192                         .sign(payer_sign).unwrap()
1193                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1194                         .fallback_v0_p2wsh(&script.wscript_hash())
1195                         .fallback_v0_p2wpkh(&pubkey.wpubkey_hash().unwrap())
1196                         .fallback_v1_p2tr_tweaked(&tweaked_pubkey)
1197                         .build().unwrap()
1198                         .sign(recipient_sign).unwrap();
1199                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1200                 assert_eq!(
1201                         invoice.fallbacks(),
1202                         vec![
1203                                 Address::p2wsh(&script, Network::Bitcoin),
1204                                 Address::p2wpkh(&pubkey, Network::Bitcoin).unwrap(),
1205                                 Address::p2tr_tweaked(tweaked_pubkey, Network::Bitcoin),
1206                         ],
1207                 );
1208                 assert_eq!(
1209                         tlv_stream.fallbacks,
1210                         Some(&vec![
1211                                 FallbackAddress {
1212                                         version: WitnessVersion::V0.to_num(),
1213                                         program: Vec::from(&script.wscript_hash().into_inner()[..]),
1214                                 },
1215                                 FallbackAddress {
1216                                         version: WitnessVersion::V0.to_num(),
1217                                         program: Vec::from(&pubkey.wpubkey_hash().unwrap().into_inner()[..]),
1218                                 },
1219                                 FallbackAddress {
1220                                         version: WitnessVersion::V1.to_num(),
1221                                         program: Vec::from(&tweaked_pubkey.serialize()[..]),
1222                                 },
1223                         ])
1224                 );
1225         }
1226
1227         #[test]
1228         fn builds_invoice_with_allow_mpp() {
1229                 let mut features = Bolt12InvoiceFeatures::empty();
1230                 features.set_basic_mpp_optional();
1231
1232                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1233                         .amount_msats(1000)
1234                         .build().unwrap()
1235                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1236                         .build().unwrap()
1237                         .sign(payer_sign).unwrap()
1238                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1239                         .allow_mpp()
1240                         .build().unwrap()
1241                         .sign(recipient_sign).unwrap();
1242                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1243                 assert_eq!(invoice.features(), &features);
1244                 assert_eq!(tlv_stream.features, Some(&features));
1245         }
1246
1247         #[test]
1248         fn fails_signing_invoice() {
1249                 match OfferBuilder::new("foo".into(), recipient_pubkey())
1250                         .amount_msats(1000)
1251                         .build().unwrap()
1252                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1253                         .build().unwrap()
1254                         .sign(payer_sign).unwrap()
1255                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1256                         .build().unwrap()
1257                         .sign(|_| Err(()))
1258                 {
1259                         Ok(_) => panic!("expected error"),
1260                         Err(e) => assert_eq!(e, SignError::Signing(())),
1261                 }
1262
1263                 match OfferBuilder::new("foo".into(), recipient_pubkey())
1264                         .amount_msats(1000)
1265                         .build().unwrap()
1266                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1267                         .build().unwrap()
1268                         .sign(payer_sign).unwrap()
1269                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1270                         .build().unwrap()
1271                         .sign(payer_sign)
1272                 {
1273                         Ok(_) => panic!("expected error"),
1274                         Err(e) => assert_eq!(e, SignError::Verification(secp256k1::Error::InvalidSignature)),
1275                 }
1276         }
1277
1278         #[test]
1279         fn parses_invoice_with_payment_paths() {
1280                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1281                         .amount_msats(1000)
1282                         .build().unwrap()
1283                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1284                         .build().unwrap()
1285                         .sign(payer_sign).unwrap()
1286                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1287                         .build().unwrap()
1288                         .sign(recipient_sign).unwrap();
1289
1290                 let mut buffer = Vec::new();
1291                 invoice.write(&mut buffer).unwrap();
1292
1293                 if let Err(e) = Invoice::try_from(buffer) {
1294                         panic!("error parsing invoice: {:?}", e);
1295                 }
1296
1297                 let mut tlv_stream = invoice.as_tlv_stream();
1298                 tlv_stream.3.paths = None;
1299
1300                 match Invoice::try_from(tlv_stream.to_bytes()) {
1301                         Ok(_) => panic!("expected error"),
1302                         Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingPaths)),
1303                 }
1304
1305                 let mut tlv_stream = invoice.as_tlv_stream();
1306                 tlv_stream.3.blindedpay = None;
1307
1308                 match Invoice::try_from(tlv_stream.to_bytes()) {
1309                         Ok(_) => panic!("expected error"),
1310                         Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::InvalidPayInfo)),
1311                 }
1312
1313                 let empty_payment_paths = vec![];
1314                 let mut tlv_stream = invoice.as_tlv_stream();
1315                 tlv_stream.3.paths = Some(Iterable(empty_payment_paths.iter().map(|(path, _)| path)));
1316
1317                 match Invoice::try_from(tlv_stream.to_bytes()) {
1318                         Ok(_) => panic!("expected error"),
1319                         Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingPaths)),
1320                 }
1321
1322                 let mut payment_paths = payment_paths();
1323                 payment_paths.pop();
1324                 let mut tlv_stream = invoice.as_tlv_stream();
1325                 tlv_stream.3.blindedpay = Some(Iterable(payment_paths.iter().map(|(_, payinfo)| payinfo)));
1326
1327                 match Invoice::try_from(tlv_stream.to_bytes()) {
1328                         Ok(_) => panic!("expected error"),
1329                         Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::InvalidPayInfo)),
1330                 }
1331         }
1332
1333         #[test]
1334         fn parses_invoice_with_created_at() {
1335                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1336                         .amount_msats(1000)
1337                         .build().unwrap()
1338                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1339                         .build().unwrap()
1340                         .sign(payer_sign).unwrap()
1341                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1342                         .build().unwrap()
1343                         .sign(recipient_sign).unwrap();
1344
1345                 let mut buffer = Vec::new();
1346                 invoice.write(&mut buffer).unwrap();
1347
1348                 if let Err(e) = Invoice::try_from(buffer) {
1349                         panic!("error parsing invoice: {:?}", e);
1350                 }
1351
1352                 let mut tlv_stream = invoice.as_tlv_stream();
1353                 tlv_stream.3.created_at = None;
1354
1355                 match Invoice::try_from(tlv_stream.to_bytes()) {
1356                         Ok(_) => panic!("expected error"),
1357                         Err(e) => {
1358                                 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingCreationTime));
1359                         },
1360                 }
1361         }
1362
1363         #[test]
1364         fn parses_invoice_with_relative_expiry() {
1365                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1366                         .amount_msats(1000)
1367                         .build().unwrap()
1368                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1369                         .build().unwrap()
1370                         .sign(payer_sign).unwrap()
1371                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1372                         .relative_expiry(3600)
1373                         .build().unwrap()
1374                         .sign(recipient_sign).unwrap();
1375
1376                 let mut buffer = Vec::new();
1377                 invoice.write(&mut buffer).unwrap();
1378
1379                 match Invoice::try_from(buffer) {
1380                         Ok(invoice) => assert_eq!(invoice.relative_expiry(), Duration::from_secs(3600)),
1381                         Err(e) => panic!("error parsing invoice: {:?}", e),
1382                 }
1383         }
1384
1385         #[test]
1386         fn parses_invoice_with_payment_hash() {
1387                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1388                         .amount_msats(1000)
1389                         .build().unwrap()
1390                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1391                         .build().unwrap()
1392                         .sign(payer_sign).unwrap()
1393                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1394                         .build().unwrap()
1395                         .sign(recipient_sign).unwrap();
1396
1397                 let mut buffer = Vec::new();
1398                 invoice.write(&mut buffer).unwrap();
1399
1400                 if let Err(e) = Invoice::try_from(buffer) {
1401                         panic!("error parsing invoice: {:?}", e);
1402                 }
1403
1404                 let mut tlv_stream = invoice.as_tlv_stream();
1405                 tlv_stream.3.payment_hash = None;
1406
1407                 match Invoice::try_from(tlv_stream.to_bytes()) {
1408                         Ok(_) => panic!("expected error"),
1409                         Err(e) => {
1410                                 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingPaymentHash));
1411                         },
1412                 }
1413         }
1414
1415         #[test]
1416         fn parses_invoice_with_amount() {
1417                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1418                         .amount_msats(1000)
1419                         .build().unwrap()
1420                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1421                         .build().unwrap()
1422                         .sign(payer_sign).unwrap()
1423                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1424                         .build().unwrap()
1425                         .sign(recipient_sign).unwrap();
1426
1427                 let mut buffer = Vec::new();
1428                 invoice.write(&mut buffer).unwrap();
1429
1430                 if let Err(e) = Invoice::try_from(buffer) {
1431                         panic!("error parsing invoice: {:?}", e);
1432                 }
1433
1434                 let mut tlv_stream = invoice.as_tlv_stream();
1435                 tlv_stream.3.amount = None;
1436
1437                 match Invoice::try_from(tlv_stream.to_bytes()) {
1438                         Ok(_) => panic!("expected error"),
1439                         Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingAmount)),
1440                 }
1441         }
1442
1443         #[test]
1444         fn parses_invoice_with_allow_mpp() {
1445                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1446                         .amount_msats(1000)
1447                         .build().unwrap()
1448                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1449                         .build().unwrap()
1450                         .sign(payer_sign).unwrap()
1451                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1452                         .allow_mpp()
1453                         .build().unwrap()
1454                         .sign(recipient_sign).unwrap();
1455
1456                 let mut buffer = Vec::new();
1457                 invoice.write(&mut buffer).unwrap();
1458
1459                 match Invoice::try_from(buffer) {
1460                         Ok(invoice) => {
1461                                 let mut features = Bolt12InvoiceFeatures::empty();
1462                                 features.set_basic_mpp_optional();
1463                                 assert_eq!(invoice.features(), &features);
1464                         },
1465                         Err(e) => panic!("error parsing invoice: {:?}", e),
1466                 }
1467         }
1468
1469         #[test]
1470         fn parses_invoice_with_fallback_address() {
1471                 let script = Script::new();
1472                 let pubkey = bitcoin::util::key::PublicKey::new(recipient_pubkey());
1473                 let x_only_pubkey = XOnlyPublicKey::from_keypair(&recipient_keys()).0;
1474                 let tweaked_pubkey = TweakedPublicKey::dangerous_assume_tweaked(x_only_pubkey);
1475
1476                 let offer = OfferBuilder::new("foo".into(), recipient_pubkey())
1477                         .amount_msats(1000)
1478                         .build().unwrap();
1479                 let invoice_request = offer
1480                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1481                         .build().unwrap()
1482                         .sign(payer_sign).unwrap();
1483                 let mut unsigned_invoice = invoice_request
1484                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1485                         .fallback_v0_p2wsh(&script.wscript_hash())
1486                         .fallback_v0_p2wpkh(&pubkey.wpubkey_hash().unwrap())
1487                         .fallback_v1_p2tr_tweaked(&tweaked_pubkey)
1488                         .build().unwrap();
1489
1490                 // Only standard addresses will be included.
1491                 let fallbacks = unsigned_invoice.invoice.fields_mut().fallbacks.as_mut().unwrap();
1492                 // Non-standard addresses
1493                 fallbacks.push(FallbackAddress { version: 1, program: vec![0u8; 41] });
1494                 fallbacks.push(FallbackAddress { version: 2, program: vec![0u8; 1] });
1495                 fallbacks.push(FallbackAddress { version: 17, program: vec![0u8; 40] });
1496                 // Standard address
1497                 fallbacks.push(FallbackAddress { version: 1, program: vec![0u8; 33] });
1498                 fallbacks.push(FallbackAddress { version: 2, program: vec![0u8; 40] });
1499
1500                 let invoice = unsigned_invoice.sign(recipient_sign).unwrap();
1501                 let mut buffer = Vec::new();
1502                 invoice.write(&mut buffer).unwrap();
1503
1504                 match Invoice::try_from(buffer) {
1505                         Ok(invoice) => {
1506                                 assert_eq!(
1507                                         invoice.fallbacks(),
1508                                         vec![
1509                                                 Address::p2wsh(&script, Network::Bitcoin),
1510                                                 Address::p2wpkh(&pubkey, Network::Bitcoin).unwrap(),
1511                                                 Address::p2tr_tweaked(tweaked_pubkey, Network::Bitcoin),
1512                                                 Address {
1513                                                         payload: Payload::WitnessProgram {
1514                                                                 version: WitnessVersion::V1,
1515                                                                 program: vec![0u8; 33],
1516                                                         },
1517                                                         network: Network::Bitcoin,
1518                                                 },
1519                                                 Address {
1520                                                         payload: Payload::WitnessProgram {
1521                                                                 version: WitnessVersion::V2,
1522                                                                 program: vec![0u8; 40],
1523                                                         },
1524                                                         network: Network::Bitcoin,
1525                                                 },
1526                                         ],
1527                                 );
1528                         },
1529                         Err(e) => panic!("error parsing invoice: {:?}", e),
1530                 }
1531         }
1532
1533         #[test]
1534         fn parses_invoice_with_node_id() {
1535                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1536                         .amount_msats(1000)
1537                         .build().unwrap()
1538                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1539                         .build().unwrap()
1540                         .sign(payer_sign).unwrap()
1541                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1542                         .build().unwrap()
1543                         .sign(recipient_sign).unwrap();
1544
1545                 let mut buffer = Vec::new();
1546                 invoice.write(&mut buffer).unwrap();
1547
1548                 if let Err(e) = Invoice::try_from(buffer) {
1549                         panic!("error parsing invoice: {:?}", e);
1550                 }
1551
1552                 let mut tlv_stream = invoice.as_tlv_stream();
1553                 tlv_stream.3.node_id = None;
1554
1555                 match Invoice::try_from(tlv_stream.to_bytes()) {
1556                         Ok(_) => panic!("expected error"),
1557                         Err(e) => {
1558                                 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingSigningPubkey));
1559                         },
1560                 }
1561
1562                 let invalid_pubkey = payer_pubkey();
1563                 let mut tlv_stream = invoice.as_tlv_stream();
1564                 tlv_stream.3.node_id = Some(&invalid_pubkey);
1565
1566                 match Invoice::try_from(tlv_stream.to_bytes()) {
1567                         Ok(_) => panic!("expected error"),
1568                         Err(e) => {
1569                                 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::InvalidSigningPubkey));
1570                         },
1571                 }
1572         }
1573
1574         #[test]
1575         fn fails_parsing_invoice_without_signature() {
1576                 let mut buffer = Vec::new();
1577                 OfferBuilder::new("foo".into(), recipient_pubkey())
1578                         .amount_msats(1000)
1579                         .build().unwrap()
1580                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1581                         .build().unwrap()
1582                         .sign(payer_sign).unwrap()
1583                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1584                         .build().unwrap()
1585                         .invoice
1586                         .write(&mut buffer).unwrap();
1587
1588                 match Invoice::try_from(buffer) {
1589                         Ok(_) => panic!("expected error"),
1590                         Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingSignature)),
1591                 }
1592         }
1593
1594         #[test]
1595         fn fails_parsing_invoice_with_invalid_signature() {
1596                 let mut invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1597                         .amount_msats(1000)
1598                         .build().unwrap()
1599                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1600                         .build().unwrap()
1601                         .sign(payer_sign).unwrap()
1602                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1603                         .build().unwrap()
1604                         .sign(recipient_sign).unwrap();
1605                 let last_signature_byte = invoice.bytes.last_mut().unwrap();
1606                 *last_signature_byte = last_signature_byte.wrapping_add(1);
1607
1608                 let mut buffer = Vec::new();
1609                 invoice.write(&mut buffer).unwrap();
1610
1611                 match Invoice::try_from(buffer) {
1612                         Ok(_) => panic!("expected error"),
1613                         Err(e) => {
1614                                 assert_eq!(e, ParseError::InvalidSignature(secp256k1::Error::InvalidSignature));
1615                         },
1616                 }
1617         }
1618
1619         #[test]
1620         fn fails_parsing_invoice_with_extra_tlv_records() {
1621                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1622                         .amount_msats(1000)
1623                         .build().unwrap()
1624                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1625                         .build().unwrap()
1626                         .sign(payer_sign).unwrap()
1627                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1628                         .build().unwrap()
1629                         .sign(recipient_sign).unwrap();
1630
1631                 let mut encoded_invoice = Vec::new();
1632                 invoice.write(&mut encoded_invoice).unwrap();
1633                 BigSize(1002).write(&mut encoded_invoice).unwrap();
1634                 BigSize(32).write(&mut encoded_invoice).unwrap();
1635                 [42u8; 32].write(&mut encoded_invoice).unwrap();
1636
1637                 match Invoice::try_from(encoded_invoice) {
1638                         Ok(_) => panic!("expected error"),
1639                         Err(e) => assert_eq!(e, ParseError::Decode(DecodeError::InvalidValue)),
1640                 }
1641         }
1642 }