_ 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 //! A [`Bolt12Invoice`] can be built from a parsed [`InvoiceRequest`] for the "offer to be paid"
  13 //! flow or from a [`Refund`] as an "offer for money" flow. The expected recipient of the payment
  14 //! then sends 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::blinded_path::BlindedPath;
  33 //! #
  34 //! # fn create_payment_paths() -> Vec<(BlindedPayInfo, BlindedPath)> { unimplemented!() }
  35 //! # fn create_payment_hash() -> PaymentHash { unimplemented!() }
  36 //! #
  37 //! # fn parse_invoice_request(bytes: Vec<u8>) -> Result<(), lightning::offers::parse::Bolt12ParseError> {
  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::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>(
  59 //!         |message| Ok(secp_ctx.sign_schnorr_no_aux_rand(message.as_ref().as_digest(), &keys))
  60 //!     )
  61 //!     .expect("failed verifying signature")
  62 //!     .write(&mut buffer)
  63 //!     .unwrap();
  64 //! # Ok(())
  65 //! # }
  66 //!
  67 //! # fn parse_refund(bytes: Vec<u8>) -> Result<(), lightning::offers::parse::Bolt12ParseError> {
  68 //! # let payment_paths = create_payment_paths();
  69 //! # let payment_hash = create_payment_hash();
  70 //! # let secp_ctx = Secp256k1::new();
  71 //! # let keys = KeyPair::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32])?);
  72 //! # let pubkey = PublicKey::from(keys);
  73 //! # let wpubkey_hash = bitcoin::key::PublicKey::new(pubkey).wpubkey_hash().unwrap();
  74 //! # let mut buffer = Vec::new();
  75 //!
  76 //! // Invoice for the "offer for money" flow.
  77 //! "lnr1qcp4256ypq"
  78 //!     .parse::<Refund>()?
  79 #![cfg_attr(feature = "std", doc = "
  80     .respond_with(payment_paths, payment_hash, pubkey)?
  81 ")]
  82 #![cfg_attr(not(feature = "std"), doc = "
  83     .respond_with_no_std(payment_paths, payment_hash, pubkey, core::time::Duration::from_secs(0))?
  84 ")]
  85 //!     .relative_expiry(3600)
  86 //!     .allow_mpp()
  87 //!     .fallback_v0_p2wpkh(&wpubkey_hash)
  88 //!     .build()?
  89 //!     .sign::<_, Infallible>(
  90 //!         |message| Ok(secp_ctx.sign_schnorr_no_aux_rand(message.as_ref().as_digest(), &keys))
  91 //!     )
  92 //!     .expect("failed verifying signature")
  93 //!     .write(&mut buffer)
  94 //!     .unwrap();
  95 //! # Ok(())
  96 //! # }
  97 //!
  98 //! ```
  99
 100 use bitcoin::blockdata::constants::ChainHash;
 101 use bitcoin::hash_types::{WPubkeyHash, WScriptHash};
 102 use bitcoin::hashes::Hash;
 103 use bitcoin::network::constants::Network;
 104 use bitcoin::secp256k1::{KeyPair, PublicKey, Secp256k1, self};
 105 use bitcoin::secp256k1::schnorr::Signature;
 106 use bitcoin::address::{Address, Payload, WitnessProgram, WitnessVersion};
 107 use bitcoin::key::TweakedPublicKey;
 108 use core::convert::{AsRef, Infallible, TryFrom};
 109 use core::time::Duration;
 110 use crate::io;
 111 use crate::blinded_path::BlindedPath;
 112 use crate::ln::PaymentHash;
 113 use crate::ln::channelmanager::PaymentId;
 114 use crate::ln::features::{BlindedHopFeatures, Bolt12InvoiceFeatures, InvoiceRequestFeatures, OfferFeatures};
 115 use crate::ln::inbound_payment::ExpandedKey;
 116 use crate::ln::msgs::DecodeError;
 117 use crate::offers::invoice_request::{INVOICE_REQUEST_PAYER_ID_TYPE, INVOICE_REQUEST_TYPES, IV_BYTES as INVOICE_REQUEST_IV_BYTES, InvoiceRequest, InvoiceRequestContents, InvoiceRequestTlvStream, InvoiceRequestTlvStreamRef};
 118 use crate::offers::merkle::{SignError, SignatureTlvStream, SignatureTlvStreamRef, TaggedHash, TlvStream, WithoutSignatures, self};
 119 use crate::offers::offer::{Amount, OFFER_TYPES, OfferTlvStream, OfferTlvStreamRef, Quantity};
 120 use crate::offers::parse::{Bolt12ParseError, Bolt12SemanticError, ParsedMessage};
 121 use crate::offers::payer::{PAYER_METADATA_TYPE, PayerTlvStream, PayerTlvStreamRef};
 122 use crate::offers::refund::{IV_BYTES as REFUND_IV_BYTES, Refund, RefundContents};
 123 use crate::offers::signer;
 124 use crate::util::ser::{HighZeroBytesDroppedBigSize, Iterable, SeekReadable, WithoutLength, Writeable, Writer};
 125 use crate::util::string::PrintableString;
 126
 127 use crate::prelude::*;
 128
 129 #[cfg(feature = "std")]
 130 use std::time::SystemTime;
 131
 132 pub(crate) const DEFAULT_RELATIVE_EXPIRY: Duration = Duration::from_secs(7200);
 133
 134 /// Tag for the hash function used when signing a [`Bolt12Invoice`]'s merkle root.
 135 pub const SIGNATURE_TAG: &'static str = concat!("lightning", "invoice", "signature");
 136
 137 /// Builds a [`Bolt12Invoice`] from either:
 138 /// - an [`InvoiceRequest`] for the "offer to be paid" flow or
 139 /// - a [`Refund`] for the "offer for money" flow.
 140 ///
 141 /// See [module-level documentation] for usage.
 142 ///
 143 /// This is not exported to bindings users as builder patterns don't map outside of move semantics.
 144 ///
 145 /// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
 146 /// [`Refund`]: crate::offers::refund::Refund
 147 /// [module-level documentation]: self
 148 pub struct InvoiceBuilder<'a, S: SigningPubkeyStrategy> {
 149         invreq_bytes: &'a Vec<u8>,
 150         invoice: InvoiceContents,
 151         signing_pubkey_strategy: S,
 152 }
 153
 154 /// Indicates how [`Bolt12Invoice::signing_pubkey`] was set.
 155 ///
 156 /// This is not exported to bindings users as builder patterns don't map outside of move semantics.
 157 pub trait SigningPubkeyStrategy {}
 158
 159 /// [`Bolt12Invoice::signing_pubkey`] was explicitly set.
 160 ///
 161 /// This is not exported to bindings users as builder patterns don't map outside of move semantics.
 162 pub struct ExplicitSigningPubkey {}
 163
 164 /// [`Bolt12Invoice::signing_pubkey`] was derived.
 165 ///
 166 /// This is not exported to bindings users as builder patterns don't map outside of move semantics.
 167 pub struct DerivedSigningPubkey(KeyPair);
 168
 169 impl SigningPubkeyStrategy for ExplicitSigningPubkey {}
 170 impl SigningPubkeyStrategy for DerivedSigningPubkey {}
 171
 172 impl<'a> InvoiceBuilder<'a, ExplicitSigningPubkey> {
 173         pub(super) fn for_offer(
 174                 invoice_request: &'a InvoiceRequest, payment_paths: Vec<(BlindedPayInfo, BlindedPath)>,
 175                 created_at: Duration, payment_hash: PaymentHash
 176         ) -> Result<Self, Bolt12SemanticError> {
 177                 let amount_msats = Self::amount_msats(invoice_request)?;
 178                 let signing_pubkey = invoice_request.contents.inner.offer.signing_pubkey();
 179                 let contents = InvoiceContents::ForOffer {
 180                         invoice_request: invoice_request.contents.clone(),
 181                         fields: Self::fields(
 182                                 payment_paths, created_at, payment_hash, amount_msats, signing_pubkey
 183                         ),
 184                 };
 185
 186                 Self::new(&invoice_request.bytes, contents, ExplicitSigningPubkey {})
 187         }
 188
 189         pub(super) fn for_refund(
 190                 refund: &'a Refund, payment_paths: Vec<(BlindedPayInfo, BlindedPath)>, created_at: Duration,
 191                 payment_hash: PaymentHash, signing_pubkey: PublicKey
 192         ) -> Result<Self, Bolt12SemanticError> {
 193                 let amount_msats = refund.amount_msats();
 194                 let contents = InvoiceContents::ForRefund {
 195                         refund: refund.contents.clone(),
 196                         fields: Self::fields(
 197                                 payment_paths, created_at, payment_hash, amount_msats, signing_pubkey
 198                         ),
 199                 };
 200
 201                 Self::new(&refund.bytes, contents, ExplicitSigningPubkey {})
 202         }
 203 }
 204
 205 impl<'a> InvoiceBuilder<'a, DerivedSigningPubkey> {
 206         pub(super) fn for_offer_using_keys(
 207                 invoice_request: &'a InvoiceRequest, payment_paths: Vec<(BlindedPayInfo, BlindedPath)>,
 208                 created_at: Duration, payment_hash: PaymentHash, keys: KeyPair
 209         ) -> Result<Self, Bolt12SemanticError> {
 210                 let amount_msats = Self::amount_msats(invoice_request)?;
 211                 let signing_pubkey = invoice_request.contents.inner.offer.signing_pubkey();
 212                 let contents = InvoiceContents::ForOffer {
 213                         invoice_request: invoice_request.contents.clone(),
 214                         fields: Self::fields(
 215                                 payment_paths, created_at, payment_hash, amount_msats, signing_pubkey
 216                         ),
 217                 };
 218
 219                 Self::new(&invoice_request.bytes, contents, DerivedSigningPubkey(keys))
 220         }
 221
 222         pub(super) fn for_refund_using_keys(
 223                 refund: &'a Refund, payment_paths: Vec<(BlindedPayInfo, BlindedPath)>, created_at: Duration,
 224                 payment_hash: PaymentHash, keys: KeyPair,
 225         ) -> Result<Self, Bolt12SemanticError> {
 226                 let amount_msats = refund.amount_msats();
 227                 let signing_pubkey = keys.public_key();
 228                 let contents = InvoiceContents::ForRefund {
 229                         refund: refund.contents.clone(),
 230                         fields: Self::fields(
 231                                 payment_paths, created_at, payment_hash, amount_msats, signing_pubkey
 232                         ),
 233                 };
 234
 235                 Self::new(&refund.bytes, contents, DerivedSigningPubkey(keys))
 236         }
 237 }
 238
 239 impl<'a, S: SigningPubkeyStrategy> InvoiceBuilder<'a, S> {
 240         pub(crate) fn amount_msats(
 241                 invoice_request: &InvoiceRequest
 242         ) -> Result<u64, Bolt12SemanticError> {
 243                 match invoice_request.amount_msats() {
 244                         Some(amount_msats) => Ok(amount_msats),
 245                         None => match invoice_request.contents.inner.offer.amount() {
 246                                 Some(Amount::Bitcoin { amount_msats }) => {
 247                                         amount_msats.checked_mul(invoice_request.quantity().unwrap_or(1))
 248                                                 .ok_or(Bolt12SemanticError::InvalidAmount)
 249                                 },
 250                                 Some(Amount::Currency { .. }) => Err(Bolt12SemanticError::UnsupportedCurrency),
 251                                 None => Err(Bolt12SemanticError::MissingAmount),
 252                         },
 253                 }
 254         }
 255
 256         fn fields(
 257                 payment_paths: Vec<(BlindedPayInfo, BlindedPath)>, created_at: Duration,
 258                 payment_hash: PaymentHash, amount_msats: u64, signing_pubkey: PublicKey
 259         ) -> InvoiceFields {
 260                 InvoiceFields {
 261                         payment_paths, created_at, relative_expiry: None, payment_hash, amount_msats,
 262                         fallbacks: None, features: Bolt12InvoiceFeatures::empty(), signing_pubkey,
 263                 }
 264         }
 265
 266         fn new(
 267                 invreq_bytes: &'a Vec<u8>, contents: InvoiceContents, signing_pubkey_strategy: S
 268         ) -> Result<Self, Bolt12SemanticError> {
 269                 if contents.fields().payment_paths.is_empty() {
 270                         return Err(Bolt12SemanticError::MissingPaths);
 271                 }
 272
 273                 Ok(Self { invreq_bytes, invoice: contents, signing_pubkey_strategy })
 274         }
 275
 276         /// Sets the [`Bolt12Invoice::relative_expiry`] as seconds since [`Bolt12Invoice::created_at`].
 277         /// Any expiry that has already passed is valid and can be checked for using
 278         /// [`Bolt12Invoice::is_expired`].
 279         ///
 280         /// Successive calls to this method will override the previous setting.
 281         pub fn relative_expiry(mut self, relative_expiry_secs: u32) -> Self {
 282                 let relative_expiry = Duration::from_secs(relative_expiry_secs as u64);
 283                 self.invoice.fields_mut().relative_expiry = Some(relative_expiry);
 284                 self
 285         }
 286
 287         /// Adds a P2WSH address to [`Bolt12Invoice::fallbacks`].
 288         ///
 289         /// Successive calls to this method will add another address. Caller is responsible for not
 290         /// adding duplicate addresses and only calling if capable of receiving to P2WSH addresses.
 291         pub fn fallback_v0_p2wsh(mut self, script_hash: &WScriptHash) -> Self {
 292                 let address = FallbackAddress {
 293                         version: WitnessVersion::V0.to_num(),
 294                         program: Vec::from(script_hash.to_byte_array()),
 295                 };
 296                 self.invoice.fields_mut().fallbacks.get_or_insert_with(Vec::new).push(address);
 297                 self
 298         }
 299
 300         /// Adds a P2WPKH address to [`Bolt12Invoice::fallbacks`].
 301         ///
 302         /// Successive calls to this method will add another address. Caller is responsible for not
 303         /// adding duplicate addresses and only calling if capable of receiving to P2WPKH addresses.
 304         pub fn fallback_v0_p2wpkh(mut self, pubkey_hash: &WPubkeyHash) -> Self {
 305                 let address = FallbackAddress {
 306                         version: WitnessVersion::V0.to_num(),
 307                         program: Vec::from(pubkey_hash.to_byte_array()),
 308                 };
 309                 self.invoice.fields_mut().fallbacks.get_or_insert_with(Vec::new).push(address);
 310                 self
 311         }
 312
 313         /// Adds a P2TR address to [`Bolt12Invoice::fallbacks`].
 314         ///
 315         /// Successive calls to this method will add another address. Caller is responsible for not
 316         /// adding duplicate addresses and only calling if capable of receiving to P2TR addresses.
 317         pub fn fallback_v1_p2tr_tweaked(mut self, output_key: &TweakedPublicKey) -> Self {
 318                 let address = FallbackAddress {
 319                         version: WitnessVersion::V1.to_num(),
 320                         program: Vec::from(&output_key.serialize()[..]),
 321                 };
 322                 self.invoice.fields_mut().fallbacks.get_or_insert_with(Vec::new).push(address);
 323                 self
 324         }
 325
 326         /// Sets [`Bolt12Invoice::invoice_features`] to indicate MPP may be used. Otherwise, MPP is
 327         /// disallowed.
 328         pub fn allow_mpp(mut self) -> Self {
 329                 self.invoice.fields_mut().features.set_basic_mpp_optional();
 330                 self
 331         }
 332 }
 333
 334 impl<'a> InvoiceBuilder<'a, ExplicitSigningPubkey> {
 335         /// Builds an unsigned [`Bolt12Invoice`] after checking for valid semantics. It can be signed by
 336         /// [`UnsignedBolt12Invoice::sign`].
 337         pub fn build(self) -> Result<UnsignedBolt12Invoice, Bolt12SemanticError> {
 338                 #[cfg(feature = "std")] {
 339                         if self.invoice.is_offer_or_refund_expired() {
 340                                 return Err(Bolt12SemanticError::AlreadyExpired);
 341                         }
 342                 }
 343
 344                 #[cfg(not(feature = "std"))] {
 345                         if self.invoice.is_offer_or_refund_expired_no_std(self.invoice.created_at()) {
 346                                 return Err(Bolt12SemanticError::AlreadyExpired);
 347                         }
 348                 }
 349
 350                 let InvoiceBuilder { invreq_bytes, invoice, .. } = self;
 351                 Ok(UnsignedBolt12Invoice::new(invreq_bytes, invoice))
 352         }
 353 }
 354
 355 impl<'a> InvoiceBuilder<'a, DerivedSigningPubkey> {
 356         /// Builds a signed [`Bolt12Invoice`] after checking for valid semantics.
 357         pub fn build_and_sign<T: secp256k1::Signing>(
 358                 self, secp_ctx: &Secp256k1<T>
 359         ) -> Result<Bolt12Invoice, Bolt12SemanticError> {
 360                 #[cfg(feature = "std")] {
 361                         if self.invoice.is_offer_or_refund_expired() {
 362                                 return Err(Bolt12SemanticError::AlreadyExpired);
 363                         }
 364                 }
 365
 366                 #[cfg(not(feature = "std"))] {
 367                         if self.invoice.is_offer_or_refund_expired_no_std(self.invoice.created_at()) {
 368                                 return Err(Bolt12SemanticError::AlreadyExpired);
 369                         }
 370                 }
 371
 372                 let InvoiceBuilder {
 373                         invreq_bytes, invoice, signing_pubkey_strategy: DerivedSigningPubkey(keys)
 374                 } = self;
 375                 let unsigned_invoice = UnsignedBolt12Invoice::new(invreq_bytes, invoice);
 376
 377                 let invoice = unsigned_invoice
 378                         .sign::<_, Infallible>(
 379                                 |message| Ok(secp_ctx.sign_schnorr_no_aux_rand(message.as_ref().as_digest(), &keys))
 380                         )
 381                         .unwrap();
 382                 Ok(invoice)
 383         }
 384 }
 385
 386 /// A semantically valid [`Bolt12Invoice`] that hasn't been signed.
 387 ///
 388 /// # Serialization
 389 ///
 390 /// This is serialized as a TLV stream, which includes TLV records from the originating message. As
 391 /// such, it may include unknown, odd TLV records.
 392 pub struct UnsignedBolt12Invoice {
 393         bytes: Vec<u8>,
 394         contents: InvoiceContents,
 395         tagged_hash: TaggedHash,
 396 }
 397
 398 impl UnsignedBolt12Invoice {
 399         fn new(invreq_bytes: &[u8], contents: InvoiceContents) -> Self {
 400                 // Use the invoice_request bytes instead of the invoice_request TLV stream as the latter may
 401                 // have contained unknown TLV records, which are not stored in `InvoiceRequestContents` or
 402                 // `RefundContents`.
 403                 let (_, _, _, invoice_tlv_stream) = contents.as_tlv_stream();
 404                 let invoice_request_bytes = WithoutSignatures(invreq_bytes);
 405                 let unsigned_tlv_stream = (invoice_request_bytes, invoice_tlv_stream);
 406
 407                 let mut bytes = Vec::new();
 408                 unsigned_tlv_stream.write(&mut bytes).unwrap();
 409
 410                 let tagged_hash = TaggedHash::new(SIGNATURE_TAG, &bytes);
 411
 412                 Self { bytes, contents, tagged_hash }
 413         }
 414
 415         /// Returns the [`TaggedHash`] of the invoice to sign.
 416         pub fn tagged_hash(&self) -> &TaggedHash {
 417                 &self.tagged_hash
 418         }
 419
 420         /// Signs the [`TaggedHash`] of the invoice using the given function.
 421         ///
 422         /// Note: The hash computation may have included unknown, odd TLV records.
 423         ///
 424         /// This is not exported to bindings users as functions aren't currently mapped.
 425         pub fn sign<F, E>(mut self, sign: F) -> Result<Bolt12Invoice, SignError<E>>
 426         where
 427                 F: FnOnce(&Self) -> Result<Signature, E>
 428         {
 429                 let pubkey = self.contents.fields().signing_pubkey;
 430                 let signature = merkle::sign_message(sign, &self, pubkey)?;
 431
 432                 // Append the signature TLV record to the bytes.
 433                 let signature_tlv_stream = SignatureTlvStreamRef {
 434                         signature: Some(&signature),
 435                 };
 436                 signature_tlv_stream.write(&mut self.bytes).unwrap();
 437
 438                 Ok(Bolt12Invoice {
 439                         bytes: self.bytes,
 440                         contents: self.contents,
 441                         signature,
 442                         tagged_hash: self.tagged_hash,
 443                 })
 444         }
 445 }
 446
 447 impl AsRef<TaggedHash> for UnsignedBolt12Invoice {
 448         fn as_ref(&self) -> &TaggedHash {
 449                 &self.tagged_hash
 450         }
 451 }
 452
 453 /// A `Bolt12Invoice` is a payment request, typically corresponding to an [`Offer`] or a [`Refund`].
 454 ///
 455 /// An invoice may be sent in response to an [`InvoiceRequest`] in the case of an offer or sent
 456 /// directly after scanning a refund. It includes all the information needed to pay a recipient.
 457 ///
 458 /// [`Offer`]: crate::offers::offer::Offer
 459 /// [`Refund`]: crate::offers::refund::Refund
 460 /// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
 461 #[derive(Clone, Debug)]
 462 #[cfg_attr(test, derive(PartialEq))]
 463 pub struct Bolt12Invoice {
 464         bytes: Vec<u8>,
 465         contents: InvoiceContents,
 466         signature: Signature,
 467         tagged_hash: TaggedHash,
 468 }
 469
 470 /// The contents of an [`Bolt12Invoice`] for responding to either an [`Offer`] or a [`Refund`].
 471 ///
 472 /// [`Offer`]: crate::offers::offer::Offer
 473 /// [`Refund`]: crate::offers::refund::Refund
 474 #[derive(Clone, Debug)]
 475 #[cfg_attr(test, derive(PartialEq))]
 476 enum InvoiceContents {
 477         /// Contents for an [`Bolt12Invoice`] corresponding to an [`Offer`].
 478         ///
 479         /// [`Offer`]: crate::offers::offer::Offer
 480         ForOffer {
 481                 invoice_request: InvoiceRequestContents,
 482                 fields: InvoiceFields,
 483         },
 484         /// Contents for an [`Bolt12Invoice`] corresponding to a [`Refund`].
 485         ///
 486         /// [`Refund`]: crate::offers::refund::Refund
 487         ForRefund {
 488                 refund: RefundContents,
 489                 fields: InvoiceFields,
 490         },
 491 }
 492
 493 /// Invoice-specific fields for an `invoice` message.
 494 #[derive(Clone, Debug, PartialEq)]
 495 struct InvoiceFields {
 496         payment_paths: Vec<(BlindedPayInfo, BlindedPath)>,
 497         created_at: Duration,
 498         relative_expiry: Option<Duration>,
 499         payment_hash: PaymentHash,
 500         amount_msats: u64,
 501         fallbacks: Option<Vec<FallbackAddress>>,
 502         features: Bolt12InvoiceFeatures,
 503         signing_pubkey: PublicKey,
 504 }
 505
 506 macro_rules! invoice_accessors { ($self: ident, $contents: expr) => {
 507         /// The chains that may be used when paying a requested invoice.
 508         ///
 509         /// From [`Offer::chains`]; `None` if the invoice was created in response to a [`Refund`].
 510         ///
 511         /// [`Offer::chains`]: crate::offers::offer::Offer::chains
 512         pub fn offer_chains(&$self) -> Option<Vec<ChainHash>> {
 513                 $contents.offer_chains()
 514         }
 515
 516         /// The chain that must be used when paying the invoice; selected from [`offer_chains`] if the
 517         /// invoice originated from an offer.
 518         ///
 519         /// From [`InvoiceRequest::chain`] or [`Refund::chain`].
 520         ///
 521         /// [`offer_chains`]: Self::offer_chains
 522         /// [`InvoiceRequest::chain`]: crate::offers::invoice_request::InvoiceRequest::chain
 523         pub fn chain(&$self) -> ChainHash {
 524                 $contents.chain()
 525         }
 526
 527         /// Opaque bytes set by the originating [`Offer`].
 528         ///
 529         /// From [`Offer::metadata`]; `None` if the invoice was created in response to a [`Refund`] or
 530         /// if the [`Offer`] did not set it.
 531         ///
 532         /// [`Offer`]: crate::offers::offer::Offer
 533         /// [`Offer::metadata`]: crate::offers::offer::Offer::metadata
 534         pub fn metadata(&$self) -> Option<&Vec<u8>> {
 535                 $contents.metadata()
 536         }
 537
 538         /// The minimum amount required for a successful payment of a single item.
 539         ///
 540         /// From [`Offer::amount`]; `None` if the invoice was created in response to a [`Refund`] or if
 541         /// the [`Offer`] did not set it.
 542         ///
 543         /// [`Offer`]: crate::offers::offer::Offer
 544         /// [`Offer::amount`]: crate::offers::offer::Offer::amount
 545         pub fn amount(&$self) -> Option<&Amount> {
 546                 $contents.amount()
 547         }
 548
 549         /// Features pertaining to the originating [`Offer`].
 550         ///
 551         /// From [`Offer::offer_features`]; `None` if the invoice was created in response to a
 552         /// [`Refund`].
 553         ///
 554         /// [`Offer`]: crate::offers::offer::Offer
 555         /// [`Offer::offer_features`]: crate::offers::offer::Offer::offer_features
 556         pub fn offer_features(&$self) -> Option<&OfferFeatures> {
 557                 $contents.offer_features()
 558         }
 559
 560         /// A complete description of the purpose of the originating offer or refund.
 561         ///
 562         /// From [`Offer::description`] or [`Refund::description`].
 563         ///
 564         /// [`Offer::description`]: crate::offers::offer::Offer::description
 565         pub fn description(&$self) -> PrintableString {
 566                 $contents.description()
 567         }
 568
 569         /// Duration since the Unix epoch when an invoice should no longer be requested.
 570         ///
 571         /// From [`Offer::absolute_expiry`] or [`Refund::absolute_expiry`].
 572         ///
 573         /// [`Offer::absolute_expiry`]: crate::offers::offer::Offer::absolute_expiry
 574         pub fn absolute_expiry(&$self) -> Option<Duration> {
 575                 $contents.absolute_expiry()
 576         }
 577
 578         /// The issuer of the offer or refund.
 579         ///
 580         /// From [`Offer::issuer`] or [`Refund::issuer`].
 581         ///
 582         /// [`Offer::issuer`]: crate::offers::offer::Offer::issuer
 583         pub fn issuer(&$self) -> Option<PrintableString> {
 584                 $contents.issuer()
 585         }
 586
 587         /// Paths to the recipient originating from publicly reachable nodes.
 588         ///
 589         /// From [`Offer::paths`] or [`Refund::paths`].
 590         ///
 591         /// [`Offer::paths`]: crate::offers::offer::Offer::paths
 592         pub fn message_paths(&$self) -> &[BlindedPath] {
 593                 $contents.message_paths()
 594         }
 595
 596         /// The quantity of items supported.
 597         ///
 598         /// From [`Offer::supported_quantity`]; `None` if the invoice was created in response to a
 599         /// [`Refund`].
 600         ///
 601         /// [`Offer::supported_quantity`]: crate::offers::offer::Offer::supported_quantity
 602         pub fn supported_quantity(&$self) -> Option<Quantity> {
 603                 $contents.supported_quantity()
 604         }
 605
 606         /// An unpredictable series of bytes from the payer.
 607         ///
 608         /// From [`InvoiceRequest::payer_metadata`] or [`Refund::payer_metadata`].
 609         pub fn payer_metadata(&$self) -> &[u8] {
 610                 $contents.payer_metadata()
 611         }
 612
 613         /// Features pertaining to requesting an invoice.
 614         ///
 615         /// From [`InvoiceRequest::invoice_request_features`] or [`Refund::features`].
 616         pub fn invoice_request_features(&$self) -> &InvoiceRequestFeatures {
 617                 &$contents.invoice_request_features()
 618         }
 619
 620         /// The quantity of items requested or refunded for.
 621         ///
 622         /// From [`InvoiceRequest::quantity`] or [`Refund::quantity`].
 623         pub fn quantity(&$self) -> Option<u64> {
 624                 $contents.quantity()
 625         }
 626
 627         /// A possibly transient pubkey used to sign the invoice request or to send an invoice for a
 628         /// refund in case there are no [`message_paths`].
 629         ///
 630         /// [`message_paths`]: Self::message_paths
 631         pub fn payer_id(&$self) -> PublicKey {
 632                 $contents.payer_id()
 633         }
 634
 635         /// A payer-provided note reflected back in the invoice.
 636         ///
 637         /// From [`InvoiceRequest::payer_note`] or [`Refund::payer_note`].
 638         pub fn payer_note(&$self) -> Option<PrintableString> {
 639                 $contents.payer_note()
 640         }
 641
 642         /// Paths to the recipient originating from publicly reachable nodes, including information
 643         /// needed for routing payments across them.
 644         ///
 645         /// Blinded paths provide recipient privacy by obfuscating its node id. Note, however, that this
 646         /// privacy is lost if a public node id is used for [`Bolt12Invoice::signing_pubkey`].
 647         ///
 648         /// This is not exported to bindings users as slices with non-reference types cannot be ABI
 649         /// matched in another language.
 650         pub fn payment_paths(&$self) -> &[(BlindedPayInfo, BlindedPath)] {
 651                 $contents.payment_paths()
 652         }
 653
 654         /// Duration since the Unix epoch when the invoice was created.
 655         pub fn created_at(&$self) -> Duration {
 656                 $contents.created_at()
 657         }
 658
 659         /// Duration since [`Bolt12Invoice::created_at`] when the invoice has expired and therefore
 660         /// should no longer be paid.
 661         pub fn relative_expiry(&$self) -> Duration {
 662                 $contents.relative_expiry()
 663         }
 664
 665         /// Whether the invoice has expired.
 666         #[cfg(feature = "std")]
 667         pub fn is_expired(&$self) -> bool {
 668                 $contents.is_expired()
 669         }
 670
 671         /// SHA256 hash of the payment preimage that will be given in return for paying the invoice.
 672         pub fn payment_hash(&$self) -> PaymentHash {
 673                 $contents.payment_hash()
 674         }
 675
 676         /// The minimum amount required for a successful payment of the invoice.
 677         pub fn amount_msats(&$self) -> u64 {
 678                 $contents.amount_msats()
 679         }
 680
 681         /// Fallback addresses for paying the invoice on-chain, in order of most-preferred to
 682         /// least-preferred.
 683         pub fn fallbacks(&$self) -> Vec<Address> {
 684                 $contents.fallbacks()
 685         }
 686
 687         /// Features pertaining to paying an invoice.
 688         pub fn invoice_features(&$self) -> &Bolt12InvoiceFeatures {
 689                 $contents.features()
 690         }
 691
 692         /// The public key corresponding to the key used to sign the invoice.
 693         pub fn signing_pubkey(&$self) -> PublicKey {
 694                 $contents.signing_pubkey()
 695         }
 696 } }
 697
 698 impl UnsignedBolt12Invoice {
 699         invoice_accessors!(self, self.contents);
 700 }
 701
 702 impl Bolt12Invoice {
 703         invoice_accessors!(self, self.contents);
 704
 705         /// Signature of the invoice verified using [`Bolt12Invoice::signing_pubkey`].
 706         pub fn signature(&self) -> Signature {
 707                 self.signature
 708         }
 709
 710         /// Hash that was used for signing the invoice.
 711         pub fn signable_hash(&self) -> [u8; 32] {
 712                 self.tagged_hash.as_digest().as_ref().clone()
 713         }
 714
 715         /// Verifies that the invoice was for a request or refund created using the given key. Returns
 716         /// the associated [`PaymentId`] to use when sending the payment.
 717         pub fn verify<T: secp256k1::Signing>(
 718                 &self, key: &ExpandedKey, secp_ctx: &Secp256k1<T>
 719         ) -> Result<PaymentId, ()> {
 720                 self.contents.verify(TlvStream::new(&self.bytes), key, secp_ctx)
 721         }
 722
 723         pub(crate) fn as_tlv_stream(&self) -> FullInvoiceTlvStreamRef {
 724                 let (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream) =
 725                         self.contents.as_tlv_stream();
 726                 let signature_tlv_stream = SignatureTlvStreamRef {
 727                         signature: Some(&self.signature),
 728                 };
 729                 (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream,
 730                  signature_tlv_stream)
 731         }
 732 }
 733
 734 impl InvoiceContents {
 735         /// Whether the original offer or refund has expired.
 736         #[cfg(feature = "std")]
 737         fn is_offer_or_refund_expired(&self) -> bool {
 738                 match self {
 739                         InvoiceContents::ForOffer { invoice_request, .. } =>
 740                                 invoice_request.inner.offer.is_expired(),
 741                         InvoiceContents::ForRefund { refund, .. } => refund.is_expired(),
 742                 }
 743         }
 744
 745         #[cfg(not(feature = "std"))]
 746         fn is_offer_or_refund_expired_no_std(&self, duration_since_epoch: Duration) -> bool {
 747                 match self {
 748                         InvoiceContents::ForOffer { invoice_request, .. } =>
 749                                 invoice_request.inner.offer.is_expired_no_std(duration_since_epoch),
 750                         InvoiceContents::ForRefund { refund, .. } =>
 751                                 refund.is_expired_no_std(duration_since_epoch),
 752                 }
 753         }
 754
 755         fn offer_chains(&self) -> Option<Vec<ChainHash>> {
 756                 match self {
 757                         InvoiceContents::ForOffer { invoice_request, .. } =>
 758                                 Some(invoice_request.inner.offer.chains()),
 759                         InvoiceContents::ForRefund { .. } => None,
 760                 }
 761         }
 762
 763         fn chain(&self) -> ChainHash {
 764                 match self {
 765                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.chain(),
 766                         InvoiceContents::ForRefund { refund, .. } => refund.chain(),
 767                 }
 768         }
 769
 770         fn metadata(&self) -> Option<&Vec<u8>> {
 771                 match self {
 772                         InvoiceContents::ForOffer { invoice_request, .. } =>
 773                                 invoice_request.inner.offer.metadata(),
 774                         InvoiceContents::ForRefund { .. } => None,
 775                 }
 776         }
 777
 778         fn amount(&self) -> Option<&Amount> {
 779                 match self {
 780                         InvoiceContents::ForOffer { invoice_request, .. } =>
 781                                 invoice_request.inner.offer.amount(),
 782                         InvoiceContents::ForRefund { .. } => None,
 783                 }
 784         }
 785
 786         fn description(&self) -> PrintableString {
 787                 match self {
 788                         InvoiceContents::ForOffer { invoice_request, .. } => {
 789                                 invoice_request.inner.offer.description()
 790                         },
 791                         InvoiceContents::ForRefund { refund, .. } => refund.description(),
 792                 }
 793         }
 794
 795         fn offer_features(&self) -> Option<&OfferFeatures> {
 796                 match self {
 797                         InvoiceContents::ForOffer { invoice_request, .. } => {
 798                                 Some(invoice_request.inner.offer.features())
 799                         },
 800                         InvoiceContents::ForRefund { .. } => None,
 801                 }
 802         }
 803
 804         fn absolute_expiry(&self) -> Option<Duration> {
 805                 match self {
 806                         InvoiceContents::ForOffer { invoice_request, .. } => {
 807                                 invoice_request.inner.offer.absolute_expiry()
 808                         },
 809                         InvoiceContents::ForRefund { refund, .. } => refund.absolute_expiry(),
 810                 }
 811         }
 812
 813         fn issuer(&self) -> Option<PrintableString> {
 814                 match self {
 815                         InvoiceContents::ForOffer { invoice_request, .. } => {
 816                                 invoice_request.inner.offer.issuer()
 817                         },
 818                         InvoiceContents::ForRefund { refund, .. } => refund.issuer(),
 819                 }
 820         }
 821
 822         fn message_paths(&self) -> &[BlindedPath] {
 823                 match self {
 824                         InvoiceContents::ForOffer { invoice_request, .. } => {
 825                                 invoice_request.inner.offer.paths()
 826                         },
 827                         InvoiceContents::ForRefund { refund, .. } => refund.paths(),
 828                 }
 829         }
 830
 831         fn supported_quantity(&self) -> Option<Quantity> {
 832                 match self {
 833                         InvoiceContents::ForOffer { invoice_request, .. } => {
 834                                 Some(invoice_request.inner.offer.supported_quantity())
 835                         },
 836                         InvoiceContents::ForRefund { .. } => None,
 837                 }
 838         }
 839
 840         fn payer_metadata(&self) -> &[u8] {
 841                 match self {
 842                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.metadata(),
 843                         InvoiceContents::ForRefund { refund, .. } => refund.metadata(),
 844                 }
 845         }
 846
 847         fn invoice_request_features(&self) -> &InvoiceRequestFeatures {
 848                 match self {
 849                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.features(),
 850                         InvoiceContents::ForRefund { refund, .. } => refund.features(),
 851                 }
 852         }
 853
 854         fn quantity(&self) -> Option<u64> {
 855                 match self {
 856                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.quantity(),
 857                         InvoiceContents::ForRefund { refund, .. } => refund.quantity(),
 858                 }
 859         }
 860
 861         fn payer_id(&self) -> PublicKey {
 862                 match self {
 863                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.payer_id(),
 864                         InvoiceContents::ForRefund { refund, .. } => refund.payer_id(),
 865                 }
 866         }
 867
 868         fn payer_note(&self) -> Option<PrintableString> {
 869                 match self {
 870                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.payer_note(),
 871                         InvoiceContents::ForRefund { refund, .. } => refund.payer_note(),
 872                 }
 873         }
 874
 875         fn payment_paths(&self) -> &[(BlindedPayInfo, BlindedPath)] {
 876                 &self.fields().payment_paths[..]
 877         }
 878
 879         fn created_at(&self) -> Duration {
 880                 self.fields().created_at
 881         }
 882
 883         fn relative_expiry(&self) -> Duration {
 884                 self.fields().relative_expiry.unwrap_or(DEFAULT_RELATIVE_EXPIRY)
 885         }
 886
 887         #[cfg(feature = "std")]
 888         fn is_expired(&self) -> bool {
 889                 let absolute_expiry = self.created_at().checked_add(self.relative_expiry());
 890                 match absolute_expiry {
 891                         Some(seconds_from_epoch) => match SystemTime::UNIX_EPOCH.elapsed() {
 892                                 Ok(elapsed) => elapsed > seconds_from_epoch,
 893                                 Err(_) => false,
 894                         },
 895                         None => false,
 896                 }
 897         }
 898
 899         fn payment_hash(&self) -> PaymentHash {
 900                 self.fields().payment_hash
 901         }
 902
 903         fn amount_msats(&self) -> u64 {
 904                 self.fields().amount_msats
 905         }
 906
 907         fn fallbacks(&self) -> Vec<Address> {
 908                 let chain = self.chain();
 909                 let network = if chain == ChainHash::using_genesis_block(Network::Bitcoin) {
 910                         Network::Bitcoin
 911                 } else if chain == ChainHash::using_genesis_block(Network::Testnet) {
 912                         Network::Testnet
 913                 } else if chain == ChainHash::using_genesis_block(Network::Signet) {
 914                         Network::Signet
 915                 } else if chain == ChainHash::using_genesis_block(Network::Regtest) {
 916                         Network::Regtest
 917                 } else {
 918                         return Vec::new()
 919                 };
 920
 921                 let to_valid_address = |address: &FallbackAddress| {
 922                         let version = match WitnessVersion::try_from(address.version) {
 923                                 Ok(version) => version,
 924                                 Err(_) => return None,
 925                         };
 926
 927                         let program = &address.program;
 928                         let witness_program = match WitnessProgram::new(version, program.clone()) {
 929                                 Ok(witness_program) => witness_program,
 930                                 Err(_) => return None,
 931                         };
 932                         Some(Address::new(network, Payload::WitnessProgram(witness_program)))
 933                 };
 934
 935                 self.fields().fallbacks
 936                         .as_ref()
 937                         .map(|fallbacks| fallbacks.iter().filter_map(to_valid_address).collect())
 938                         .unwrap_or_else(Vec::new)
 939         }
 940
 941         fn features(&self) -> &Bolt12InvoiceFeatures {
 942                 &self.fields().features
 943         }
 944
 945         fn signing_pubkey(&self) -> PublicKey {
 946                 self.fields().signing_pubkey
 947         }
 948
 949         fn fields(&self) -> &InvoiceFields {
 950                 match self {
 951                         InvoiceContents::ForOffer { fields, .. } => fields,
 952                         InvoiceContents::ForRefund { fields, .. } => fields,
 953                 }
 954         }
 955
 956         fn fields_mut(&mut self) -> &mut InvoiceFields {
 957                 match self {
 958                         InvoiceContents::ForOffer { fields, .. } => fields,
 959                         InvoiceContents::ForRefund { fields, .. } => fields,
 960                 }
 961         }
 962
 963         fn verify<T: secp256k1::Signing>(
 964                 &self, tlv_stream: TlvStream<'_>, key: &ExpandedKey, secp_ctx: &Secp256k1<T>
 965         ) -> Result<PaymentId, ()> {
 966                 let offer_records = tlv_stream.clone().range(OFFER_TYPES);
 967                 let invreq_records = tlv_stream.range(INVOICE_REQUEST_TYPES).filter(|record| {
 968                         match record.r#type {
 969                                 PAYER_METADATA_TYPE => false, // Should be outside range
 970                                 INVOICE_REQUEST_PAYER_ID_TYPE => !self.derives_keys(),
 971                                 _ => true,
 972                         }
 973                 });
 974                 let tlv_stream = offer_records.chain(invreq_records);
 975
 976                 let (metadata, payer_id, iv_bytes) = match self {
 977                         InvoiceContents::ForOffer { invoice_request, .. } => {
 978                                 (invoice_request.metadata(), invoice_request.payer_id(), INVOICE_REQUEST_IV_BYTES)
 979                         },
 980                         InvoiceContents::ForRefund { refund, .. } => {
 981                                 (refund.metadata(), refund.payer_id(), REFUND_IV_BYTES)
 982                         },
 983                 };
 984
 985                 signer::verify_payer_metadata(metadata, key, iv_bytes, payer_id, tlv_stream, secp_ctx)
 986         }
 987
 988         fn derives_keys(&self) -> bool {
 989                 match self {
 990                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.derives_keys(),
 991                         InvoiceContents::ForRefund { refund, .. } => refund.derives_keys(),
 992                 }
 993         }
 994
 995         fn as_tlv_stream(&self) -> PartialInvoiceTlvStreamRef {
 996                 let (payer, offer, invoice_request) = match self {
 997                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.as_tlv_stream(),
 998                         InvoiceContents::ForRefund { refund, .. } => refund.as_tlv_stream(),
 999                 };
1000                 let invoice = self.fields().as_tlv_stream();
1001
1002                 (payer, offer, invoice_request, invoice)
1003         }
1004 }
1005
1006 impl InvoiceFields {
1007         fn as_tlv_stream(&self) -> InvoiceTlvStreamRef {
1008                 let features = {
1009                         if self.features == Bolt12InvoiceFeatures::empty() { None }
1010                         else { Some(&self.features) }
1011                 };
1012
1013                 InvoiceTlvStreamRef {
1014                         paths: Some(Iterable(self.payment_paths.iter().map(|(_, path)| path))),
1015                         blindedpay: Some(Iterable(self.payment_paths.iter().map(|(payinfo, _)| payinfo))),
1016                         created_at: Some(self.created_at.as_secs()),
1017                         relative_expiry: self.relative_expiry.map(|duration| duration.as_secs() as u32),
1018                         payment_hash: Some(&self.payment_hash),
1019                         amount: Some(self.amount_msats),
1020                         fallbacks: self.fallbacks.as_ref(),
1021                         features,
1022                         node_id: Some(&self.signing_pubkey),
1023                 }
1024         }
1025 }
1026
1027 impl Writeable for UnsignedBolt12Invoice {
1028         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
1029                 WithoutLength(&self.bytes).write(writer)
1030         }
1031 }
1032
1033 impl Writeable for Bolt12Invoice {
1034         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
1035                 WithoutLength(&self.bytes).write(writer)
1036         }
1037 }
1038
1039 impl Writeable for InvoiceContents {
1040         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
1041                 self.as_tlv_stream().write(writer)
1042         }
1043 }
1044
1045 impl TryFrom<Vec<u8>> for UnsignedBolt12Invoice {
1046         type Error = Bolt12ParseError;
1047
1048         fn try_from(bytes: Vec<u8>) -> Result<Self, Self::Error> {
1049                 let invoice = ParsedMessage::<PartialInvoiceTlvStream>::try_from(bytes)?;
1050                 let ParsedMessage { bytes, tlv_stream } = invoice;
1051                 let (
1052                         payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream,
1053                 ) = tlv_stream;
1054                 let contents = InvoiceContents::try_from(
1055                         (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream)
1056                 )?;
1057
1058                 let tagged_hash = TaggedHash::new(SIGNATURE_TAG, &bytes);
1059
1060                 Ok(UnsignedBolt12Invoice { bytes, contents, tagged_hash })
1061         }
1062 }
1063
1064 impl TryFrom<Vec<u8>> for Bolt12Invoice {
1065         type Error = Bolt12ParseError;
1066
1067         fn try_from(bytes: Vec<u8>) -> Result<Self, Self::Error> {
1068                 let parsed_invoice = ParsedMessage::<FullInvoiceTlvStream>::try_from(bytes)?;
1069                 Bolt12Invoice::try_from(parsed_invoice)
1070         }
1071 }
1072
1073 tlv_stream!(InvoiceTlvStream, InvoiceTlvStreamRef, 160..240, {
1074         (160, paths: (Vec<BlindedPath>, WithoutLength, Iterable<'a, BlindedPathIter<'a>, BlindedPath>)),
1075         (162, blindedpay: (Vec<BlindedPayInfo>, WithoutLength, Iterable<'a, BlindedPayInfoIter<'a>, BlindedPayInfo>)),
1076         (164, created_at: (u64, HighZeroBytesDroppedBigSize)),
1077         (166, relative_expiry: (u32, HighZeroBytesDroppedBigSize)),
1078         (168, payment_hash: PaymentHash),
1079         (170, amount: (u64, HighZeroBytesDroppedBigSize)),
1080         (172, fallbacks: (Vec<FallbackAddress>, WithoutLength)),
1081         (174, features: (Bolt12InvoiceFeatures, WithoutLength)),
1082         (176, node_id: PublicKey),
1083 });
1084
1085 type BlindedPathIter<'a> = core::iter::Map<
1086         core::slice::Iter<'a, (BlindedPayInfo, BlindedPath)>,
1087         for<'r> fn(&'r (BlindedPayInfo, BlindedPath)) -> &'r BlindedPath,
1088 >;
1089
1090 type BlindedPayInfoIter<'a> = core::iter::Map<
1091         core::slice::Iter<'a, (BlindedPayInfo, BlindedPath)>,
1092         for<'r> fn(&'r (BlindedPayInfo, BlindedPath)) -> &'r BlindedPayInfo,
1093 >;
1094
1095 /// Information needed to route a payment across a [`BlindedPath`].
1096 #[derive(Clone, Debug, Hash, Eq, PartialEq)]
1097 pub struct BlindedPayInfo {
1098         /// Base fee charged (in millisatoshi) for the entire blinded path.
1099         pub fee_base_msat: u32,
1100
1101         /// Liquidity fee charged (in millionths of the amount transferred) for the entire blinded path
1102         /// (i.e., 10,000 is 1%).
1103         pub fee_proportional_millionths: u32,
1104
1105         /// Number of blocks subtracted from an incoming HTLC's `cltv_expiry` for the entire blinded
1106         /// path.
1107         pub cltv_expiry_delta: u16,
1108
1109         /// The minimum HTLC value (in millisatoshi) that is acceptable to all channel peers on the
1110         /// blinded path from the introduction node to the recipient, accounting for any fees, i.e., as
1111         /// seen by the recipient.
1112         pub htlc_minimum_msat: u64,
1113
1114         /// The maximum HTLC value (in millisatoshi) that is acceptable to all channel peers on the
1115         /// blinded path from the introduction node to the recipient, accounting for any fees, i.e., as
1116         /// seen by the recipient.
1117         pub htlc_maximum_msat: u64,
1118
1119         /// Features set in `encrypted_data_tlv` for the `encrypted_recipient_data` TLV record in an
1120         /// onion payload.
1121         pub features: BlindedHopFeatures,
1122 }
1123
1124 impl_writeable!(BlindedPayInfo, {
1125         fee_base_msat,
1126         fee_proportional_millionths,
1127         cltv_expiry_delta,
1128         htlc_minimum_msat,
1129         htlc_maximum_msat,
1130         features
1131 });
1132
1133 /// Wire representation for an on-chain fallback address.
1134 #[derive(Clone, Debug, PartialEq)]
1135 pub(super) struct FallbackAddress {
1136         version: u8,
1137         program: Vec<u8>,
1138 }
1139
1140 impl_writeable!(FallbackAddress, { version, program });
1141
1142 type FullInvoiceTlvStream =
1143         (PayerTlvStream, OfferTlvStream, InvoiceRequestTlvStream, InvoiceTlvStream, SignatureTlvStream);
1144
1145 type FullInvoiceTlvStreamRef<'a> = (
1146         PayerTlvStreamRef<'a>,
1147         OfferTlvStreamRef<'a>,
1148         InvoiceRequestTlvStreamRef<'a>,
1149         InvoiceTlvStreamRef<'a>,
1150         SignatureTlvStreamRef<'a>,
1151 );
1152
1153 impl SeekReadable for FullInvoiceTlvStream {
1154         fn read<R: io::Read + io::Seek>(r: &mut R) -> Result<Self, DecodeError> {
1155                 let payer = SeekReadable::read(r)?;
1156                 let offer = SeekReadable::read(r)?;
1157                 let invoice_request = SeekReadable::read(r)?;
1158                 let invoice = SeekReadable::read(r)?;
1159                 let signature = SeekReadable::read(r)?;
1160
1161                 Ok((payer, offer, invoice_request, invoice, signature))
1162         }
1163 }
1164
1165 type PartialInvoiceTlvStream =
1166         (PayerTlvStream, OfferTlvStream, InvoiceRequestTlvStream, InvoiceTlvStream);
1167
1168 type PartialInvoiceTlvStreamRef<'a> = (
1169         PayerTlvStreamRef<'a>,
1170         OfferTlvStreamRef<'a>,
1171         InvoiceRequestTlvStreamRef<'a>,
1172         InvoiceTlvStreamRef<'a>,
1173 );
1174
1175 impl SeekReadable for PartialInvoiceTlvStream {
1176         fn read<R: io::Read + io::Seek>(r: &mut R) -> Result<Self, DecodeError> {
1177                 let payer = SeekReadable::read(r)?;
1178                 let offer = SeekReadable::read(r)?;
1179                 let invoice_request = SeekReadable::read(r)?;
1180                 let invoice = SeekReadable::read(r)?;
1181
1182                 Ok((payer, offer, invoice_request, invoice))
1183         }
1184 }
1185
1186 impl TryFrom<ParsedMessage<FullInvoiceTlvStream>> for Bolt12Invoice {
1187         type Error = Bolt12ParseError;
1188
1189         fn try_from(invoice: ParsedMessage<FullInvoiceTlvStream>) -> Result<Self, Self::Error> {
1190                 let ParsedMessage { bytes, tlv_stream } = invoice;
1191                 let (
1192                         payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream,
1193                         SignatureTlvStream { signature },
1194                 ) = tlv_stream;
1195                 let contents = InvoiceContents::try_from(
1196                         (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream)
1197                 )?;
1198
1199                 let signature = match signature {
1200                         None => return Err(Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingSignature)),
1201                         Some(signature) => signature,
1202                 };
1203                 let tagged_hash = TaggedHash::new(SIGNATURE_TAG, &bytes);
1204                 let pubkey = contents.fields().signing_pubkey;
1205                 merkle::verify_signature(&signature, &tagged_hash, pubkey)?;
1206
1207                 Ok(Bolt12Invoice { bytes, contents, signature, tagged_hash })
1208         }
1209 }
1210
1211 impl TryFrom<PartialInvoiceTlvStream> for InvoiceContents {
1212         type Error = Bolt12SemanticError;
1213
1214         fn try_from(tlv_stream: PartialInvoiceTlvStream) -> Result<Self, Self::Error> {
1215                 let (
1216                         payer_tlv_stream,
1217                         offer_tlv_stream,
1218                         invoice_request_tlv_stream,
1219                         InvoiceTlvStream {
1220                                 paths, blindedpay, created_at, relative_expiry, payment_hash, amount, fallbacks,
1221                                 features, node_id,
1222                         },
1223                 ) = tlv_stream;
1224
1225                 let payment_paths = match (blindedpay, paths) {
1226                         (_, None) => return Err(Bolt12SemanticError::MissingPaths),
1227                         (None, _) => return Err(Bolt12SemanticError::InvalidPayInfo),
1228                         (_, Some(paths)) if paths.is_empty() => return Err(Bolt12SemanticError::MissingPaths),
1229                         (Some(blindedpay), Some(paths)) if paths.len() != blindedpay.len() => {
1230                                 return Err(Bolt12SemanticError::InvalidPayInfo);
1231                         },
1232                         (Some(blindedpay), Some(paths)) => {
1233                                 blindedpay.into_iter().zip(paths.into_iter()).collect::<Vec<_>>()
1234                         },
1235                 };
1236
1237                 let created_at = match created_at {
1238                         None => return Err(Bolt12SemanticError::MissingCreationTime),
1239                         Some(timestamp) => Duration::from_secs(timestamp),
1240                 };
1241
1242                 let relative_expiry = relative_expiry
1243                         .map(Into::<u64>::into)
1244                         .map(Duration::from_secs);
1245
1246                 let payment_hash = match payment_hash {
1247                         None => return Err(Bolt12SemanticError::MissingPaymentHash),
1248                         Some(payment_hash) => payment_hash,
1249                 };
1250
1251                 let amount_msats = match amount {
1252                         None => return Err(Bolt12SemanticError::MissingAmount),
1253                         Some(amount) => amount,
1254                 };
1255
1256                 let features = features.unwrap_or_else(Bolt12InvoiceFeatures::empty);
1257
1258                 let signing_pubkey = match node_id {
1259                         None => return Err(Bolt12SemanticError::MissingSigningPubkey),
1260                         Some(node_id) => node_id,
1261                 };
1262
1263                 let fields = InvoiceFields {
1264                         payment_paths, created_at, relative_expiry, payment_hash, amount_msats, fallbacks,
1265                         features, signing_pubkey,
1266                 };
1267
1268                 match offer_tlv_stream.node_id {
1269                         Some(expected_signing_pubkey) => {
1270                                 if fields.signing_pubkey != expected_signing_pubkey {
1271                                         return Err(Bolt12SemanticError::InvalidSigningPubkey);
1272                                 }
1273
1274                                 let invoice_request = InvoiceRequestContents::try_from(
1275                                         (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream)
1276                                 )?;
1277                                 Ok(InvoiceContents::ForOffer { invoice_request, fields })
1278                         },
1279                         None => {
1280                                 let refund = RefundContents::try_from(
1281                                         (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream)
1282                                 )?;
1283                                 Ok(InvoiceContents::ForRefund { refund, fields })
1284                         },
1285                 }
1286         }
1287 }
1288
1289 #[cfg(test)]
1290 mod tests {
1291         use super::{Bolt12Invoice, DEFAULT_RELATIVE_EXPIRY, FallbackAddress, FullInvoiceTlvStreamRef, InvoiceTlvStreamRef, SIGNATURE_TAG, UnsignedBolt12Invoice};
1292
1293         use bitcoin::blockdata::constants::ChainHash;
1294         use bitcoin::blockdata::script::ScriptBuf;
1295         use bitcoin::hashes::Hash;
1296         use bitcoin::network::constants::Network;
1297         use bitcoin::secp256k1::{Message, Secp256k1, XOnlyPublicKey, self};
1298         use bitcoin::address::{Address, Payload, WitnessProgram, WitnessVersion};
1299         use bitcoin::key::TweakedPublicKey;
1300         use core::convert::TryFrom;
1301         use core::time::Duration;
1302         use crate::blinded_path::{BlindedHop, BlindedPath};
1303         use crate::sign::KeyMaterial;
1304         use crate::ln::features::{Bolt12InvoiceFeatures, InvoiceRequestFeatures, OfferFeatures};
1305         use crate::ln::inbound_payment::ExpandedKey;
1306         use crate::ln::msgs::DecodeError;
1307         use crate::offers::invoice_request::InvoiceRequestTlvStreamRef;
1308         use crate::offers::merkle::{SignError, SignatureTlvStreamRef, TaggedHash, self};
1309         use crate::offers::offer::{Amount, OfferBuilder, OfferTlvStreamRef, Quantity};
1310         use crate::offers::parse::{Bolt12ParseError, Bolt12SemanticError};
1311         use crate::offers::payer::PayerTlvStreamRef;
1312         use crate::offers::refund::RefundBuilder;
1313         use crate::offers::test_utils::*;
1314         use crate::util::ser::{BigSize, Iterable, Writeable};
1315         use crate::util::string::PrintableString;
1316
1317         trait ToBytes {
1318                 fn to_bytes(&self) -> Vec<u8>;
1319         }
1320
1321         impl<'a> ToBytes for FullInvoiceTlvStreamRef<'a> {
1322                 fn to_bytes(&self) -> Vec<u8> {
1323                         let mut buffer = Vec::new();
1324                         self.0.write(&mut buffer).unwrap();
1325                         self.1.write(&mut buffer).unwrap();
1326                         self.2.write(&mut buffer).unwrap();
1327                         self.3.write(&mut buffer).unwrap();
1328                         self.4.write(&mut buffer).unwrap();
1329                         buffer
1330                 }
1331         }
1332
1333         #[test]
1334         fn builds_invoice_for_offer_with_defaults() {
1335                 let payment_paths = payment_paths();
1336                 let payment_hash = payment_hash();
1337                 let now = now();
1338                 let unsigned_invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1339                         .amount_msats(1000)
1340                         .build().unwrap()
1341                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1342                         .build().unwrap()
1343                         .sign(payer_sign).unwrap()
1344                         .respond_with_no_std(payment_paths.clone(), payment_hash, now).unwrap()
1345                         .build().unwrap();
1346
1347                 let mut buffer = Vec::new();
1348                 unsigned_invoice.write(&mut buffer).unwrap();
1349
1350                 assert_eq!(unsigned_invoice.bytes, buffer.as_slice());
1351                 assert_eq!(unsigned_invoice.payer_metadata(), &[1; 32]);
1352                 assert_eq!(unsigned_invoice.offer_chains(), Some(vec![ChainHash::using_genesis_block(Network::Bitcoin)]));
1353                 assert_eq!(unsigned_invoice.metadata(), None);
1354                 assert_eq!(unsigned_invoice.amount(), Some(&Amount::Bitcoin { amount_msats: 1000 }));
1355                 assert_eq!(unsigned_invoice.description(), PrintableString("foo"));
1356                 assert_eq!(unsigned_invoice.offer_features(), Some(&OfferFeatures::empty()));
1357                 assert_eq!(unsigned_invoice.absolute_expiry(), None);
1358                 assert_eq!(unsigned_invoice.message_paths(), &[]);
1359                 assert_eq!(unsigned_invoice.issuer(), None);
1360                 assert_eq!(unsigned_invoice.supported_quantity(), Some(Quantity::One));
1361                 assert_eq!(unsigned_invoice.signing_pubkey(), recipient_pubkey());
1362                 assert_eq!(unsigned_invoice.chain(), ChainHash::using_genesis_block(Network::Bitcoin));
1363                 assert_eq!(unsigned_invoice.amount_msats(), 1000);
1364                 assert_eq!(unsigned_invoice.invoice_request_features(), &InvoiceRequestFeatures::empty());
1365                 assert_eq!(unsigned_invoice.quantity(), None);
1366                 assert_eq!(unsigned_invoice.payer_id(), payer_pubkey());
1367                 assert_eq!(unsigned_invoice.payer_note(), None);
1368                 assert_eq!(unsigned_invoice.payment_paths(), payment_paths.as_slice());
1369                 assert_eq!(unsigned_invoice.created_at(), now);
1370                 assert_eq!(unsigned_invoice.relative_expiry(), DEFAULT_RELATIVE_EXPIRY);
1371                 #[cfg(feature = "std")]
1372                 assert!(!unsigned_invoice.is_expired());
1373                 assert_eq!(unsigned_invoice.payment_hash(), payment_hash);
1374                 assert_eq!(unsigned_invoice.amount_msats(), 1000);
1375                 assert_eq!(unsigned_invoice.fallbacks(), vec![]);
1376                 assert_eq!(unsigned_invoice.invoice_features(), &Bolt12InvoiceFeatures::empty());
1377                 assert_eq!(unsigned_invoice.signing_pubkey(), recipient_pubkey());
1378
1379                 match UnsignedBolt12Invoice::try_from(buffer) {
1380                         Err(e) => panic!("error parsing unsigned invoice: {:?}", e),
1381                         Ok(parsed) => {
1382                                 assert_eq!(parsed.bytes, unsigned_invoice.bytes);
1383                                 assert_eq!(parsed.tagged_hash, unsigned_invoice.tagged_hash);
1384                         },
1385                 }
1386
1387                 let invoice = unsigned_invoice.sign(recipient_sign).unwrap();
1388
1389                 let mut buffer = Vec::new();
1390                 invoice.write(&mut buffer).unwrap();
1391
1392                 assert_eq!(invoice.bytes, buffer.as_slice());
1393                 assert_eq!(invoice.payer_metadata(), &[1; 32]);
1394                 assert_eq!(invoice.offer_chains(), Some(vec![ChainHash::using_genesis_block(Network::Bitcoin)]));
1395                 assert_eq!(invoice.metadata(), None);
1396                 assert_eq!(invoice.amount(), Some(&Amount::Bitcoin { amount_msats: 1000 }));
1397                 assert_eq!(invoice.description(), PrintableString("foo"));
1398                 assert_eq!(invoice.offer_features(), Some(&OfferFeatures::empty()));
1399                 assert_eq!(invoice.absolute_expiry(), None);
1400                 assert_eq!(invoice.message_paths(), &[]);
1401                 assert_eq!(invoice.issuer(), None);
1402                 assert_eq!(invoice.supported_quantity(), Some(Quantity::One));
1403                 assert_eq!(invoice.signing_pubkey(), recipient_pubkey());
1404                 assert_eq!(invoice.chain(), ChainHash::using_genesis_block(Network::Bitcoin));
1405                 assert_eq!(invoice.amount_msats(), 1000);
1406                 assert_eq!(invoice.invoice_request_features(), &InvoiceRequestFeatures::empty());
1407                 assert_eq!(invoice.quantity(), None);
1408                 assert_eq!(invoice.payer_id(), payer_pubkey());
1409                 assert_eq!(invoice.payer_note(), None);
1410                 assert_eq!(invoice.payment_paths(), payment_paths.as_slice());
1411                 assert_eq!(invoice.created_at(), now);
1412                 assert_eq!(invoice.relative_expiry(), DEFAULT_RELATIVE_EXPIRY);
1413                 #[cfg(feature = "std")]
1414                 assert!(!invoice.is_expired());
1415                 assert_eq!(invoice.payment_hash(), payment_hash);
1416                 assert_eq!(invoice.amount_msats(), 1000);
1417                 assert_eq!(invoice.fallbacks(), vec![]);
1418                 assert_eq!(invoice.invoice_features(), &Bolt12InvoiceFeatures::empty());
1419                 assert_eq!(invoice.signing_pubkey(), recipient_pubkey());
1420
1421                 let message = TaggedHash::new(SIGNATURE_TAG, &invoice.bytes);
1422                 assert!(merkle::verify_signature(&invoice.signature, &message, recipient_pubkey()).is_ok());
1423
1424                 let digest = Message::from_slice(&invoice.signable_hash()).unwrap();
1425                 let pubkey = recipient_pubkey().into();
1426                 let secp_ctx = Secp256k1::verification_only();
1427                 assert!(secp_ctx.verify_schnorr(&invoice.signature, &digest, &pubkey).is_ok());
1428
1429                 assert_eq!(
1430                         invoice.as_tlv_stream(),
1431                         (
1432                                 PayerTlvStreamRef { metadata: Some(&vec![1; 32]) },
1433                                 OfferTlvStreamRef {
1434                                         chains: None,
1435                                         metadata: None,
1436                                         currency: None,
1437                                         amount: Some(1000),
1438                                         description: Some(&String::from("foo")),
1439                                         features: None,
1440                                         absolute_expiry: None,
1441                                         paths: None,
1442                                         issuer: None,
1443                                         quantity_max: None,
1444                                         node_id: Some(&recipient_pubkey()),
1445                                 },
1446                                 InvoiceRequestTlvStreamRef {
1447                                         chain: None,
1448                                         amount: None,
1449                                         features: None,
1450                                         quantity: None,
1451                                         payer_id: Some(&payer_pubkey()),
1452                                         payer_note: None,
1453                                 },
1454                                 InvoiceTlvStreamRef {
1455                                         paths: Some(Iterable(payment_paths.iter().map(|(_, path)| path))),
1456                                         blindedpay: Some(Iterable(payment_paths.iter().map(|(payinfo, _)| payinfo))),
1457                                         created_at: Some(now.as_secs()),
1458                                         relative_expiry: None,
1459                                         payment_hash: Some(&payment_hash),
1460                                         amount: Some(1000),
1461                                         fallbacks: None,
1462                                         features: None,
1463                                         node_id: Some(&recipient_pubkey()),
1464                                 },
1465                                 SignatureTlvStreamRef { signature: Some(&invoice.signature()) },
1466                         ),
1467                 );
1468
1469                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
1470                         panic!("error parsing invoice: {:?}", e);
1471                 }
1472         }
1473
1474         #[test]
1475         fn builds_invoice_for_refund_with_defaults() {
1476                 let payment_paths = payment_paths();
1477                 let payment_hash = payment_hash();
1478                 let now = now();
1479                 let invoice = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1480                         .build().unwrap()
1481                         .respond_with_no_std(payment_paths.clone(), payment_hash, recipient_pubkey(), now)
1482                         .unwrap()
1483                         .build().unwrap()
1484                         .sign(recipient_sign).unwrap();
1485
1486                 let mut buffer = Vec::new();
1487                 invoice.write(&mut buffer).unwrap();
1488
1489                 assert_eq!(invoice.bytes, buffer.as_slice());
1490                 assert_eq!(invoice.payer_metadata(), &[1; 32]);
1491                 assert_eq!(invoice.offer_chains(), None);
1492                 assert_eq!(invoice.metadata(), None);
1493                 assert_eq!(invoice.amount(), None);
1494                 assert_eq!(invoice.description(), PrintableString("foo"));
1495                 assert_eq!(invoice.offer_features(), None);
1496                 assert_eq!(invoice.absolute_expiry(), None);
1497                 assert_eq!(invoice.message_paths(), &[]);
1498                 assert_eq!(invoice.issuer(), None);
1499                 assert_eq!(invoice.supported_quantity(), None);
1500                 assert_eq!(invoice.signing_pubkey(), recipient_pubkey());
1501                 assert_eq!(invoice.chain(), ChainHash::using_genesis_block(Network::Bitcoin));
1502                 assert_eq!(invoice.amount_msats(), 1000);
1503                 assert_eq!(invoice.invoice_request_features(), &InvoiceRequestFeatures::empty());
1504                 assert_eq!(invoice.quantity(), None);
1505                 assert_eq!(invoice.payer_id(), payer_pubkey());
1506                 assert_eq!(invoice.payer_note(), None);
1507                 assert_eq!(invoice.payment_paths(), payment_paths.as_slice());
1508                 assert_eq!(invoice.created_at(), now);
1509                 assert_eq!(invoice.relative_expiry(), DEFAULT_RELATIVE_EXPIRY);
1510                 #[cfg(feature = "std")]
1511                 assert!(!invoice.is_expired());
1512                 assert_eq!(invoice.payment_hash(), payment_hash);
1513                 assert_eq!(invoice.amount_msats(), 1000);
1514                 assert_eq!(invoice.fallbacks(), vec![]);
1515                 assert_eq!(invoice.invoice_features(), &Bolt12InvoiceFeatures::empty());
1516                 assert_eq!(invoice.signing_pubkey(), recipient_pubkey());
1517
1518                 let message = TaggedHash::new(SIGNATURE_TAG, &invoice.bytes);
1519                 assert!(merkle::verify_signature(&invoice.signature, &message, recipient_pubkey()).is_ok());
1520
1521                 assert_eq!(
1522                         invoice.as_tlv_stream(),
1523                         (
1524                                 PayerTlvStreamRef { metadata: Some(&vec![1; 32]) },
1525                                 OfferTlvStreamRef {
1526                                         chains: None,
1527                                         metadata: None,
1528                                         currency: None,
1529                                         amount: None,
1530                                         description: Some(&String::from("foo")),
1531                                         features: None,
1532                                         absolute_expiry: None,
1533                                         paths: None,
1534                                         issuer: None,
1535                                         quantity_max: None,
1536                                         node_id: None,
1537                                 },
1538                                 InvoiceRequestTlvStreamRef {
1539                                         chain: None,
1540                                         amount: Some(1000),
1541                                         features: None,
1542                                         quantity: None,
1543                                         payer_id: Some(&payer_pubkey()),
1544                                         payer_note: None,
1545                                 },
1546                                 InvoiceTlvStreamRef {
1547                                         paths: Some(Iterable(payment_paths.iter().map(|(_, path)| path))),
1548                                         blindedpay: Some(Iterable(payment_paths.iter().map(|(payinfo, _)| payinfo))),
1549                                         created_at: Some(now.as_secs()),
1550                                         relative_expiry: None,
1551                                         payment_hash: Some(&payment_hash),
1552                                         amount: Some(1000),
1553                                         fallbacks: None,
1554                                         features: None,
1555                                         node_id: Some(&recipient_pubkey()),
1556                                 },
1557                                 SignatureTlvStreamRef { signature: Some(&invoice.signature()) },
1558                         ),
1559                 );
1560
1561                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
1562                         panic!("error parsing invoice: {:?}", e);
1563                 }
1564         }
1565
1566         #[cfg(feature = "std")]
1567         #[test]
1568         fn builds_invoice_from_offer_with_expiration() {
1569                 let future_expiry = Duration::from_secs(u64::max_value());
1570                 let past_expiry = Duration::from_secs(0);
1571
1572                 if let Err(e) = OfferBuilder::new("foo".into(), recipient_pubkey())
1573                         .amount_msats(1000)
1574                         .absolute_expiry(future_expiry)
1575                         .build().unwrap()
1576                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1577                         .build().unwrap()
1578                         .sign(payer_sign).unwrap()
1579                         .respond_with(payment_paths(), payment_hash())
1580                         .unwrap()
1581                         .build()
1582                 {
1583                         panic!("error building invoice: {:?}", e);
1584                 }
1585
1586                 match OfferBuilder::new("foo".into(), recipient_pubkey())
1587                         .amount_msats(1000)
1588                         .absolute_expiry(past_expiry)
1589                         .build().unwrap()
1590                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1591                         .build_unchecked()
1592                         .sign(payer_sign).unwrap()
1593                         .respond_with(payment_paths(), payment_hash())
1594                         .unwrap()
1595                         .build()
1596                 {
1597                         Ok(_) => panic!("expected error"),
1598                         Err(e) => assert_eq!(e, Bolt12SemanticError::AlreadyExpired),
1599                 }
1600         }
1601
1602         #[cfg(feature = "std")]
1603         #[test]
1604         fn builds_invoice_from_refund_with_expiration() {
1605                 let future_expiry = Duration::from_secs(u64::max_value());
1606                 let past_expiry = Duration::from_secs(0);
1607
1608                 if let Err(e) = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1609                         .absolute_expiry(future_expiry)
1610                         .build().unwrap()
1611                         .respond_with(payment_paths(), payment_hash(), recipient_pubkey())
1612                         .unwrap()
1613                         .build()
1614                 {
1615                         panic!("error building invoice: {:?}", e);
1616                 }
1617
1618                 match RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1619                         .absolute_expiry(past_expiry)
1620                         .build().unwrap()
1621                         .respond_with(payment_paths(), payment_hash(), recipient_pubkey())
1622                         .unwrap()
1623                         .build()
1624                 {
1625                         Ok(_) => panic!("expected error"),
1626                         Err(e) => assert_eq!(e, Bolt12SemanticError::AlreadyExpired),
1627                 }
1628         }
1629
1630         #[test]
1631         fn builds_invoice_from_offer_using_derived_keys() {
1632                 let desc = "foo".to_string();
1633                 let node_id = recipient_pubkey();
1634                 let expanded_key = ExpandedKey::new(&KeyMaterial([42; 32]));
1635                 let entropy = FixedEntropy {};
1636                 let secp_ctx = Secp256k1::new();
1637
1638                 let blinded_path = BlindedPath {
1639                         introduction_node_id: pubkey(40),
1640                         blinding_point: pubkey(41),
1641                         blinded_hops: vec![
1642                                 BlindedHop { blinded_node_id: pubkey(42), encrypted_payload: vec![0; 43] },
1643                                 BlindedHop { blinded_node_id: node_id, encrypted_payload: vec![0; 44] },
1644                         ],
1645                 };
1646
1647                 let offer = OfferBuilder
1648                         ::deriving_signing_pubkey(desc, node_id, &expanded_key, &entropy, &secp_ctx)
1649                         .amount_msats(1000)
1650                         .path(blinded_path)
1651                         .build().unwrap();
1652                 let invoice_request = offer.request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1653                         .build().unwrap()
1654                         .sign(payer_sign).unwrap();
1655
1656                 if let Err(e) = invoice_request.clone()
1657                         .verify(&expanded_key, &secp_ctx).unwrap()
1658                         .respond_using_derived_keys_no_std(payment_paths(), payment_hash(), now()).unwrap()
1659                         .build_and_sign(&secp_ctx)
1660                 {
1661                         panic!("error building invoice: {:?}", e);
1662                 }
1663
1664                 let expanded_key = ExpandedKey::new(&KeyMaterial([41; 32]));
1665                 assert!(invoice_request.verify(&expanded_key, &secp_ctx).is_err());
1666
1667                 let desc = "foo".to_string();
1668                 let offer = OfferBuilder
1669                         ::deriving_signing_pubkey(desc, node_id, &expanded_key, &entropy, &secp_ctx)
1670                         .amount_msats(1000)
1671                         // Omit the path so that node_id is used for the signing pubkey instead of deriving
1672                         .build().unwrap();
1673                 let invoice_request = offer.request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1674                         .build().unwrap()
1675                         .sign(payer_sign).unwrap();
1676
1677                 match invoice_request
1678                         .verify(&expanded_key, &secp_ctx).unwrap()
1679                         .respond_using_derived_keys_no_std(payment_paths(), payment_hash(), now())
1680                 {
1681                         Ok(_) => panic!("expected error"),
1682                         Err(e) => assert_eq!(e, Bolt12SemanticError::InvalidMetadata),
1683                 }
1684         }
1685
1686         #[test]
1687         fn builds_invoice_from_refund_using_derived_keys() {
1688                 let expanded_key = ExpandedKey::new(&KeyMaterial([42; 32]));
1689                 let entropy = FixedEntropy {};
1690                 let secp_ctx = Secp256k1::new();
1691
1692                 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1693                         .build().unwrap();
1694
1695                 if let Err(e) = refund
1696                         .respond_using_derived_keys_no_std(
1697                                 payment_paths(), payment_hash(), now(), &expanded_key, &entropy
1698                         )
1699                         .unwrap()
1700                         .build_and_sign(&secp_ctx)
1701                 {
1702                         panic!("error building invoice: {:?}", e);
1703                 }
1704         }
1705
1706         #[test]
1707         fn builds_invoice_with_relative_expiry() {
1708                 let now = now();
1709                 let one_hour = Duration::from_secs(3600);
1710
1711                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1712                         .amount_msats(1000)
1713                         .build().unwrap()
1714                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1715                         .build().unwrap()
1716                         .sign(payer_sign).unwrap()
1717                         .respond_with_no_std(payment_paths(), payment_hash(), now).unwrap()
1718                         .relative_expiry(one_hour.as_secs() as u32)
1719                         .build().unwrap()
1720                         .sign(recipient_sign).unwrap();
1721                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1722                 #[cfg(feature = "std")]
1723                 assert!(!invoice.is_expired());
1724                 assert_eq!(invoice.relative_expiry(), one_hour);
1725                 assert_eq!(tlv_stream.relative_expiry, Some(one_hour.as_secs() as u32));
1726
1727                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1728                         .amount_msats(1000)
1729                         .build().unwrap()
1730                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1731                         .build().unwrap()
1732                         .sign(payer_sign).unwrap()
1733                         .respond_with_no_std(payment_paths(), payment_hash(), now - one_hour).unwrap()
1734                         .relative_expiry(one_hour.as_secs() as u32 - 1)
1735                         .build().unwrap()
1736                         .sign(recipient_sign).unwrap();
1737                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1738                 #[cfg(feature = "std")]
1739                 assert!(invoice.is_expired());
1740                 assert_eq!(invoice.relative_expiry(), one_hour - Duration::from_secs(1));
1741                 assert_eq!(tlv_stream.relative_expiry, Some(one_hour.as_secs() as u32 - 1));
1742         }
1743
1744         #[test]
1745         fn builds_invoice_with_amount_from_request() {
1746                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1747                         .amount_msats(1000)
1748                         .build().unwrap()
1749                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1750                         .amount_msats(1001).unwrap()
1751                         .build().unwrap()
1752                         .sign(payer_sign).unwrap()
1753                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1754                         .build().unwrap()
1755                         .sign(recipient_sign).unwrap();
1756                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1757                 assert_eq!(invoice.amount_msats(), 1001);
1758                 assert_eq!(tlv_stream.amount, Some(1001));
1759         }
1760
1761         #[test]
1762         fn builds_invoice_with_quantity_from_request() {
1763                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1764                         .amount_msats(1000)
1765                         .supported_quantity(Quantity::Unbounded)
1766                         .build().unwrap()
1767                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1768                         .quantity(2).unwrap()
1769                         .build().unwrap()
1770                         .sign(payer_sign).unwrap()
1771                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1772                         .build().unwrap()
1773                         .sign(recipient_sign).unwrap();
1774                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1775                 assert_eq!(invoice.amount_msats(), 2000);
1776                 assert_eq!(tlv_stream.amount, Some(2000));
1777
1778                 match OfferBuilder::new("foo".into(), recipient_pubkey())
1779                         .amount_msats(1000)
1780                         .supported_quantity(Quantity::Unbounded)
1781                         .build().unwrap()
1782                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1783                         .quantity(u64::max_value()).unwrap()
1784                         .build_unchecked()
1785                         .sign(payer_sign).unwrap()
1786                         .respond_with_no_std(payment_paths(), payment_hash(), now())
1787                 {
1788                         Ok(_) => panic!("expected error"),
1789                         Err(e) => assert_eq!(e, Bolt12SemanticError::InvalidAmount),
1790                 }
1791         }
1792
1793         #[test]
1794         fn builds_invoice_with_fallback_address() {
1795                 let script = ScriptBuf::new();
1796                 let pubkey = bitcoin::key::PublicKey::new(recipient_pubkey());
1797                 let x_only_pubkey = XOnlyPublicKey::from_keypair(&recipient_keys()).0;
1798                 let tweaked_pubkey = TweakedPublicKey::dangerous_assume_tweaked(x_only_pubkey);
1799
1800                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1801                         .amount_msats(1000)
1802                         .build().unwrap()
1803                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1804                         .build().unwrap()
1805                         .sign(payer_sign).unwrap()
1806                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1807                         .fallback_v0_p2wsh(&script.wscript_hash())
1808                         .fallback_v0_p2wpkh(&pubkey.wpubkey_hash().unwrap())
1809                         .fallback_v1_p2tr_tweaked(&tweaked_pubkey)
1810                         .build().unwrap()
1811                         .sign(recipient_sign).unwrap();
1812                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1813                 assert_eq!(
1814                         invoice.fallbacks(),
1815                         vec![
1816                                 Address::p2wsh(&script, Network::Bitcoin),
1817                                 Address::p2wpkh(&pubkey, Network::Bitcoin).unwrap(),
1818                                 Address::p2tr_tweaked(tweaked_pubkey, Network::Bitcoin),
1819                         ],
1820                 );
1821                 assert_eq!(
1822                         tlv_stream.fallbacks,
1823                         Some(&vec![
1824                                 FallbackAddress {
1825                                         version: WitnessVersion::V0.to_num(),
1826                                         program: Vec::from(script.wscript_hash().to_byte_array()),
1827                                 },
1828                                 FallbackAddress {
1829                                         version: WitnessVersion::V0.to_num(),
1830                                         program: Vec::from(pubkey.wpubkey_hash().unwrap().to_byte_array()),
1831                                 },
1832                                 FallbackAddress {
1833                                         version: WitnessVersion::V1.to_num(),
1834                                         program: Vec::from(&tweaked_pubkey.serialize()[..]),
1835                                 },
1836                         ])
1837                 );
1838         }
1839
1840         #[test]
1841         fn builds_invoice_with_allow_mpp() {
1842                 let mut features = Bolt12InvoiceFeatures::empty();
1843                 features.set_basic_mpp_optional();
1844
1845                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1846                         .amount_msats(1000)
1847                         .build().unwrap()
1848                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1849                         .build().unwrap()
1850                         .sign(payer_sign).unwrap()
1851                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1852                         .allow_mpp()
1853                         .build().unwrap()
1854                         .sign(recipient_sign).unwrap();
1855                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1856                 assert_eq!(invoice.invoice_features(), &features);
1857                 assert_eq!(tlv_stream.features, Some(&features));
1858         }
1859
1860         #[test]
1861         fn fails_signing_invoice() {
1862                 match OfferBuilder::new("foo".into(), recipient_pubkey())
1863                         .amount_msats(1000)
1864                         .build().unwrap()
1865                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1866                         .build().unwrap()
1867                         .sign(payer_sign).unwrap()
1868                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1869                         .build().unwrap()
1870                         .sign(|_| Err(()))
1871                 {
1872                         Ok(_) => panic!("expected error"),
1873                         Err(e) => assert_eq!(e, SignError::Signing(())),
1874                 }
1875
1876                 match OfferBuilder::new("foo".into(), recipient_pubkey())
1877                         .amount_msats(1000)
1878                         .build().unwrap()
1879                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1880                         .build().unwrap()
1881                         .sign(payer_sign).unwrap()
1882                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1883                         .build().unwrap()
1884                         .sign(payer_sign)
1885                 {
1886                         Ok(_) => panic!("expected error"),
1887                         Err(e) => assert_eq!(e, SignError::Verification(secp256k1::Error::InvalidSignature)),
1888                 }
1889         }
1890
1891         #[test]
1892         fn parses_invoice_with_payment_paths() {
1893                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1894                         .amount_msats(1000)
1895                         .build().unwrap()
1896                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1897                         .build().unwrap()
1898                         .sign(payer_sign).unwrap()
1899                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1900                         .build().unwrap()
1901                         .sign(recipient_sign).unwrap();
1902
1903                 let mut buffer = Vec::new();
1904                 invoice.write(&mut buffer).unwrap();
1905
1906                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
1907                         panic!("error parsing invoice: {:?}", e);
1908                 }
1909
1910                 let mut tlv_stream = invoice.as_tlv_stream();
1911                 tlv_stream.3.paths = None;
1912
1913                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
1914                         Ok(_) => panic!("expected error"),
1915                         Err(e) => assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingPaths)),
1916                 }
1917
1918                 let mut tlv_stream = invoice.as_tlv_stream();
1919                 tlv_stream.3.blindedpay = None;
1920
1921                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
1922                         Ok(_) => panic!("expected error"),
1923                         Err(e) => assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::InvalidPayInfo)),
1924                 }
1925
1926                 let empty_payment_paths = vec![];
1927                 let mut tlv_stream = invoice.as_tlv_stream();
1928                 tlv_stream.3.paths = Some(Iterable(empty_payment_paths.iter().map(|(_, path)| path)));
1929
1930                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
1931                         Ok(_) => panic!("expected error"),
1932                         Err(e) => assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingPaths)),
1933                 }
1934
1935                 let mut payment_paths = payment_paths();
1936                 payment_paths.pop();
1937                 let mut tlv_stream = invoice.as_tlv_stream();
1938                 tlv_stream.3.blindedpay = Some(Iterable(payment_paths.iter().map(|(payinfo, _)| payinfo)));
1939
1940                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
1941                         Ok(_) => panic!("expected error"),
1942                         Err(e) => assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::InvalidPayInfo)),
1943                 }
1944         }
1945
1946         #[test]
1947         fn parses_invoice_with_created_at() {
1948                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1949                         .amount_msats(1000)
1950                         .build().unwrap()
1951                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1952                         .build().unwrap()
1953                         .sign(payer_sign).unwrap()
1954                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1955                         .build().unwrap()
1956                         .sign(recipient_sign).unwrap();
1957
1958                 let mut buffer = Vec::new();
1959                 invoice.write(&mut buffer).unwrap();
1960
1961                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
1962                         panic!("error parsing invoice: {:?}", e);
1963                 }
1964
1965                 let mut tlv_stream = invoice.as_tlv_stream();
1966                 tlv_stream.3.created_at = None;
1967
1968                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
1969                         Ok(_) => panic!("expected error"),
1970                         Err(e) => {
1971                                 assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingCreationTime));
1972                         },
1973                 }
1974         }
1975
1976         #[test]
1977         fn parses_invoice_with_relative_expiry() {
1978                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1979                         .amount_msats(1000)
1980                         .build().unwrap()
1981                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1982                         .build().unwrap()
1983                         .sign(payer_sign).unwrap()
1984                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1985                         .relative_expiry(3600)
1986                         .build().unwrap()
1987                         .sign(recipient_sign).unwrap();
1988
1989                 let mut buffer = Vec::new();
1990                 invoice.write(&mut buffer).unwrap();
1991
1992                 match Bolt12Invoice::try_from(buffer) {
1993                         Ok(invoice) => assert_eq!(invoice.relative_expiry(), Duration::from_secs(3600)),
1994                         Err(e) => panic!("error parsing invoice: {:?}", e),
1995                 }
1996         }
1997
1998         #[test]
1999         fn parses_invoice_with_payment_hash() {
2000                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
2001                         .amount_msats(1000)
2002                         .build().unwrap()
2003                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2004                         .build().unwrap()
2005                         .sign(payer_sign).unwrap()
2006                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2007                         .build().unwrap()
2008                         .sign(recipient_sign).unwrap();
2009
2010                 let mut buffer = Vec::new();
2011                 invoice.write(&mut buffer).unwrap();
2012
2013                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
2014                         panic!("error parsing invoice: {:?}", e);
2015                 }
2016
2017                 let mut tlv_stream = invoice.as_tlv_stream();
2018                 tlv_stream.3.payment_hash = None;
2019
2020                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
2021                         Ok(_) => panic!("expected error"),
2022                         Err(e) => {
2023                                 assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingPaymentHash));
2024                         },
2025                 }
2026         }
2027
2028         #[test]
2029         fn parses_invoice_with_amount() {
2030                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
2031                         .amount_msats(1000)
2032                         .build().unwrap()
2033                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2034                         .build().unwrap()
2035                         .sign(payer_sign).unwrap()
2036                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2037                         .build().unwrap()
2038                         .sign(recipient_sign).unwrap();
2039
2040                 let mut buffer = Vec::new();
2041                 invoice.write(&mut buffer).unwrap();
2042
2043                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
2044                         panic!("error parsing invoice: {:?}", e);
2045                 }
2046
2047                 let mut tlv_stream = invoice.as_tlv_stream();
2048                 tlv_stream.3.amount = None;
2049
2050                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
2051                         Ok(_) => panic!("expected error"),
2052                         Err(e) => assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingAmount)),
2053                 }
2054         }
2055
2056         #[test]
2057         fn parses_invoice_with_allow_mpp() {
2058                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
2059                         .amount_msats(1000)
2060                         .build().unwrap()
2061                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2062                         .build().unwrap()
2063                         .sign(payer_sign).unwrap()
2064                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2065                         .allow_mpp()
2066                         .build().unwrap()
2067                         .sign(recipient_sign).unwrap();
2068
2069                 let mut buffer = Vec::new();
2070                 invoice.write(&mut buffer).unwrap();
2071
2072                 match Bolt12Invoice::try_from(buffer) {
2073                         Ok(invoice) => {
2074                                 let mut features = Bolt12InvoiceFeatures::empty();
2075                                 features.set_basic_mpp_optional();
2076                                 assert_eq!(invoice.invoice_features(), &features);
2077                         },
2078                         Err(e) => panic!("error parsing invoice: {:?}", e),
2079                 }
2080         }
2081
2082         #[test]
2083         fn parses_invoice_with_fallback_address() {
2084                 let script = ScriptBuf::new();
2085                 let pubkey = bitcoin::key::PublicKey::new(recipient_pubkey());
2086                 let x_only_pubkey = XOnlyPublicKey::from_keypair(&recipient_keys()).0;
2087                 let tweaked_pubkey = TweakedPublicKey::dangerous_assume_tweaked(x_only_pubkey);
2088
2089                 let offer = OfferBuilder::new("foo".into(), recipient_pubkey())
2090                         .amount_msats(1000)
2091                         .build().unwrap();
2092                 let invoice_request = offer
2093                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2094                         .build().unwrap()
2095                         .sign(payer_sign).unwrap();
2096                 let mut invoice_builder = invoice_request
2097                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2098                         .fallback_v0_p2wsh(&script.wscript_hash())
2099                         .fallback_v0_p2wpkh(&pubkey.wpubkey_hash().unwrap())
2100                         .fallback_v1_p2tr_tweaked(&tweaked_pubkey);
2101
2102                 // Only standard addresses will be included.
2103                 let fallbacks = invoice_builder.invoice.fields_mut().fallbacks.as_mut().unwrap();
2104                 // Non-standard addresses
2105                 fallbacks.push(FallbackAddress { version: 1, program: vec![0u8; 41] });
2106                 fallbacks.push(FallbackAddress { version: 2, program: vec![0u8; 1] });
2107                 fallbacks.push(FallbackAddress { version: 17, program: vec![0u8; 40] });
2108                 // Standard address
2109                 fallbacks.push(FallbackAddress { version: 1, program: vec![0u8; 33] });
2110                 fallbacks.push(FallbackAddress { version: 2, program: vec![0u8; 40] });
2111
2112                 let invoice = invoice_builder.build().unwrap().sign(recipient_sign).unwrap();
2113                 let mut buffer = Vec::new();
2114                 invoice.write(&mut buffer).unwrap();
2115
2116                 match Bolt12Invoice::try_from(buffer) {
2117                         Ok(invoice) => {
2118                                 let v1_witness_program = WitnessProgram::new(WitnessVersion::V1, vec![0u8; 33]).unwrap();
2119                                 let v2_witness_program = WitnessProgram::new(WitnessVersion::V2, vec![0u8; 40]).unwrap();
2120                                 assert_eq!(
2121                                         invoice.fallbacks(),
2122                                         vec![
2123                                                 Address::p2wsh(&script, Network::Bitcoin),
2124                                                 Address::p2wpkh(&pubkey, Network::Bitcoin).unwrap(),
2125                                                 Address::p2tr_tweaked(tweaked_pubkey, Network::Bitcoin),
2126                                                 Address::new(Network::Bitcoin, Payload::WitnessProgram(v1_witness_program)),
2127                                                 Address::new(Network::Bitcoin, Payload::WitnessProgram(v2_witness_program)),
2128                                         ],
2129                                 );
2130                         },
2131                         Err(e) => panic!("error parsing invoice: {:?}", e),
2132                 }
2133         }
2134
2135         #[test]
2136         fn parses_invoice_with_node_id() {
2137                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
2138                         .amount_msats(1000)
2139                         .build().unwrap()
2140                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2141                         .build().unwrap()
2142                         .sign(payer_sign).unwrap()
2143                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2144                         .build().unwrap()
2145                         .sign(recipient_sign).unwrap();
2146
2147                 let mut buffer = Vec::new();
2148                 invoice.write(&mut buffer).unwrap();
2149
2150                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
2151                         panic!("error parsing invoice: {:?}", e);
2152                 }
2153
2154                 let mut tlv_stream = invoice.as_tlv_stream();
2155                 tlv_stream.3.node_id = None;
2156
2157                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
2158                         Ok(_) => panic!("expected error"),
2159                         Err(e) => {
2160                                 assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingSigningPubkey));
2161                         },
2162                 }
2163
2164                 let invalid_pubkey = payer_pubkey();
2165                 let mut tlv_stream = invoice.as_tlv_stream();
2166                 tlv_stream.3.node_id = Some(&invalid_pubkey);
2167
2168                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
2169                         Ok(_) => panic!("expected error"),
2170                         Err(e) => {
2171                                 assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::InvalidSigningPubkey));
2172                         },
2173                 }
2174         }
2175
2176         #[test]
2177         fn fails_parsing_invoice_without_signature() {
2178                 let mut buffer = Vec::new();
2179                 OfferBuilder::new("foo".into(), recipient_pubkey())
2180                         .amount_msats(1000)
2181                         .build().unwrap()
2182                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2183                         .build().unwrap()
2184                         .sign(payer_sign).unwrap()
2185                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2186                         .build().unwrap()
2187                         .contents
2188                         .write(&mut buffer).unwrap();
2189
2190                 match Bolt12Invoice::try_from(buffer) {
2191                         Ok(_) => panic!("expected error"),
2192                         Err(e) => assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingSignature)),
2193                 }
2194         }
2195
2196         #[test]
2197         fn fails_parsing_invoice_with_invalid_signature() {
2198                 let mut invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
2199                         .amount_msats(1000)
2200                         .build().unwrap()
2201                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2202                         .build().unwrap()
2203                         .sign(payer_sign).unwrap()
2204                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2205                         .build().unwrap()
2206                         .sign(recipient_sign).unwrap();
2207                 let last_signature_byte = invoice.bytes.last_mut().unwrap();
2208                 *last_signature_byte = last_signature_byte.wrapping_add(1);
2209
2210                 let mut buffer = Vec::new();
2211                 invoice.write(&mut buffer).unwrap();
2212
2213                 match Bolt12Invoice::try_from(buffer) {
2214                         Ok(_) => panic!("expected error"),
2215                         Err(e) => {
2216                                 assert_eq!(e, Bolt12ParseError::InvalidSignature(secp256k1::Error::InvalidSignature));
2217                         },
2218                 }
2219         }
2220
2221         #[test]
2222         fn fails_parsing_invoice_with_extra_tlv_records() {
2223                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
2224                         .amount_msats(1000)
2225                         .build().unwrap()
2226                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2227                         .build().unwrap()
2228                         .sign(payer_sign).unwrap()
2229                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2230                         .build().unwrap()
2231                         .sign(recipient_sign).unwrap();
2232
2233                 let mut encoded_invoice = Vec::new();
2234                 invoice.write(&mut encoded_invoice).unwrap();
2235                 BigSize(1002).write(&mut encoded_invoice).unwrap();
2236                 BigSize(32).write(&mut encoded_invoice).unwrap();
2237                 [42u8; 32].write(&mut encoded_invoice).unwrap();
2238
2239                 match Bolt12Invoice::try_from(encoded_invoice) {
2240                         Ok(_) => panic!("expected error"),
2241                         Err(e) => assert_eq!(e, Bolt12ParseError::Decode(DecodeError::InvalidValue)),
2242                 }
2243         }
2244 }