_ 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         #[cfg(test)]
 724         pub(super) fn as_tlv_stream(&self) -> FullInvoiceTlvStreamRef {
 725                 let (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream) =
 726                         self.contents.as_tlv_stream();
 727                 let signature_tlv_stream = SignatureTlvStreamRef {
 728                         signature: Some(&self.signature),
 729                 };
 730                 (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream,
 731                  signature_tlv_stream)
 732         }
 733 }
 734
 735 impl InvoiceContents {
 736         /// Whether the original offer or refund has expired.
 737         #[cfg(feature = "std")]
 738         fn is_offer_or_refund_expired(&self) -> bool {
 739                 match self {
 740                         InvoiceContents::ForOffer { invoice_request, .. } =>
 741                                 invoice_request.inner.offer.is_expired(),
 742                         InvoiceContents::ForRefund { refund, .. } => refund.is_expired(),
 743                 }
 744         }
 745
 746         #[cfg(not(feature = "std"))]
 747         fn is_offer_or_refund_expired_no_std(&self, duration_since_epoch: Duration) -> bool {
 748                 match self {
 749                         InvoiceContents::ForOffer { invoice_request, .. } =>
 750                                 invoice_request.inner.offer.is_expired_no_std(duration_since_epoch),
 751                         InvoiceContents::ForRefund { refund, .. } =>
 752                                 refund.is_expired_no_std(duration_since_epoch),
 753                 }
 754         }
 755
 756         fn offer_chains(&self) -> Option<Vec<ChainHash>> {
 757                 match self {
 758                         InvoiceContents::ForOffer { invoice_request, .. } =>
 759                                 Some(invoice_request.inner.offer.chains()),
 760                         InvoiceContents::ForRefund { .. } => None,
 761                 }
 762         }
 763
 764         fn chain(&self) -> ChainHash {
 765                 match self {
 766                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.chain(),
 767                         InvoiceContents::ForRefund { refund, .. } => refund.chain(),
 768                 }
 769         }
 770
 771         fn metadata(&self) -> Option<&Vec<u8>> {
 772                 match self {
 773                         InvoiceContents::ForOffer { invoice_request, .. } =>
 774                                 invoice_request.inner.offer.metadata(),
 775                         InvoiceContents::ForRefund { .. } => None,
 776                 }
 777         }
 778
 779         fn amount(&self) -> Option<&Amount> {
 780                 match self {
 781                         InvoiceContents::ForOffer { invoice_request, .. } =>
 782                                 invoice_request.inner.offer.amount(),
 783                         InvoiceContents::ForRefund { .. } => None,
 784                 }
 785         }
 786
 787         fn description(&self) -> PrintableString {
 788                 match self {
 789                         InvoiceContents::ForOffer { invoice_request, .. } => {
 790                                 invoice_request.inner.offer.description()
 791                         },
 792                         InvoiceContents::ForRefund { refund, .. } => refund.description(),
 793                 }
 794         }
 795
 796         fn offer_features(&self) -> Option<&OfferFeatures> {
 797                 match self {
 798                         InvoiceContents::ForOffer { invoice_request, .. } => {
 799                                 Some(invoice_request.inner.offer.features())
 800                         },
 801                         InvoiceContents::ForRefund { .. } => None,
 802                 }
 803         }
 804
 805         fn absolute_expiry(&self) -> Option<Duration> {
 806                 match self {
 807                         InvoiceContents::ForOffer { invoice_request, .. } => {
 808                                 invoice_request.inner.offer.absolute_expiry()
 809                         },
 810                         InvoiceContents::ForRefund { refund, .. } => refund.absolute_expiry(),
 811                 }
 812         }
 813
 814         fn issuer(&self) -> Option<PrintableString> {
 815                 match self {
 816                         InvoiceContents::ForOffer { invoice_request, .. } => {
 817                                 invoice_request.inner.offer.issuer()
 818                         },
 819                         InvoiceContents::ForRefund { refund, .. } => refund.issuer(),
 820                 }
 821         }
 822
 823         fn message_paths(&self) -> &[BlindedPath] {
 824                 match self {
 825                         InvoiceContents::ForOffer { invoice_request, .. } => {
 826                                 invoice_request.inner.offer.paths()
 827                         },
 828                         InvoiceContents::ForRefund { refund, .. } => refund.paths(),
 829                 }
 830         }
 831
 832         fn supported_quantity(&self) -> Option<Quantity> {
 833                 match self {
 834                         InvoiceContents::ForOffer { invoice_request, .. } => {
 835                                 Some(invoice_request.inner.offer.supported_quantity())
 836                         },
 837                         InvoiceContents::ForRefund { .. } => None,
 838                 }
 839         }
 840
 841         fn payer_metadata(&self) -> &[u8] {
 842                 match self {
 843                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.metadata(),
 844                         InvoiceContents::ForRefund { refund, .. } => refund.metadata(),
 845                 }
 846         }
 847
 848         fn invoice_request_features(&self) -> &InvoiceRequestFeatures {
 849                 match self {
 850                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.features(),
 851                         InvoiceContents::ForRefund { refund, .. } => refund.features(),
 852                 }
 853         }
 854
 855         fn quantity(&self) -> Option<u64> {
 856                 match self {
 857                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.quantity(),
 858                         InvoiceContents::ForRefund { refund, .. } => refund.quantity(),
 859                 }
 860         }
 861
 862         fn payer_id(&self) -> PublicKey {
 863                 match self {
 864                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.payer_id(),
 865                         InvoiceContents::ForRefund { refund, .. } => refund.payer_id(),
 866                 }
 867         }
 868
 869         fn payer_note(&self) -> Option<PrintableString> {
 870                 match self {
 871                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.payer_note(),
 872                         InvoiceContents::ForRefund { refund, .. } => refund.payer_note(),
 873                 }
 874         }
 875
 876         fn payment_paths(&self) -> &[(BlindedPayInfo, BlindedPath)] {
 877                 &self.fields().payment_paths[..]
 878         }
 879
 880         fn created_at(&self) -> Duration {
 881                 self.fields().created_at
 882         }
 883
 884         fn relative_expiry(&self) -> Duration {
 885                 self.fields().relative_expiry.unwrap_or(DEFAULT_RELATIVE_EXPIRY)
 886         }
 887
 888         #[cfg(feature = "std")]
 889         fn is_expired(&self) -> bool {
 890                 let absolute_expiry = self.created_at().checked_add(self.relative_expiry());
 891                 match absolute_expiry {
 892                         Some(seconds_from_epoch) => match SystemTime::UNIX_EPOCH.elapsed() {
 893                                 Ok(elapsed) => elapsed > seconds_from_epoch,
 894                                 Err(_) => false,
 895                         },
 896                         None => false,
 897                 }
 898         }
 899
 900         fn payment_hash(&self) -> PaymentHash {
 901                 self.fields().payment_hash
 902         }
 903
 904         fn amount_msats(&self) -> u64 {
 905                 self.fields().amount_msats
 906         }
 907
 908         fn fallbacks(&self) -> Vec<Address> {
 909                 let chain = self.chain();
 910                 let network = if chain == ChainHash::using_genesis_block(Network::Bitcoin) {
 911                         Network::Bitcoin
 912                 } else if chain == ChainHash::using_genesis_block(Network::Testnet) {
 913                         Network::Testnet
 914                 } else if chain == ChainHash::using_genesis_block(Network::Signet) {
 915                         Network::Signet
 916                 } else if chain == ChainHash::using_genesis_block(Network::Regtest) {
 917                         Network::Regtest
 918                 } else {
 919                         return Vec::new()
 920                 };
 921
 922                 let to_valid_address = |address: &FallbackAddress| {
 923                         let version = match WitnessVersion::try_from(address.version) {
 924                                 Ok(version) => version,
 925                                 Err(_) => return None,
 926                         };
 927
 928                         let program = &address.program;
 929                         if program.len() < 2 || program.len() > 40 {
 930                                 return None;
 931                         }
 932
 933                         let witness_program = match WitnessProgram::new(version, program.clone()) {
 934                                 Ok(witness_program) => witness_program,
 935                                 Err(_) => return None,
 936                         };
 937                         let address = Address::new(network, Payload::WitnessProgram(witness_program));
 938                         if !address.is_spend_standard() && version == WitnessVersion::V0 {
 939                                 return None;
 940                         }
 941
 942                         Some(address)
 943                 };
 944
 945                 self.fields().fallbacks
 946                         .as_ref()
 947                         .map(|fallbacks| fallbacks.iter().filter_map(to_valid_address).collect())
 948                         .unwrap_or_else(Vec::new)
 949         }
 950
 951         fn features(&self) -> &Bolt12InvoiceFeatures {
 952                 &self.fields().features
 953         }
 954
 955         fn signing_pubkey(&self) -> PublicKey {
 956                 self.fields().signing_pubkey
 957         }
 958
 959         fn fields(&self) -> &InvoiceFields {
 960                 match self {
 961                         InvoiceContents::ForOffer { fields, .. } => fields,
 962                         InvoiceContents::ForRefund { fields, .. } => fields,
 963                 }
 964         }
 965
 966         fn fields_mut(&mut self) -> &mut InvoiceFields {
 967                 match self {
 968                         InvoiceContents::ForOffer { fields, .. } => fields,
 969                         InvoiceContents::ForRefund { fields, .. } => fields,
 970                 }
 971         }
 972
 973         fn verify<T: secp256k1::Signing>(
 974                 &self, tlv_stream: TlvStream<'_>, key: &ExpandedKey, secp_ctx: &Secp256k1<T>
 975         ) -> Result<PaymentId, ()> {
 976                 let offer_records = tlv_stream.clone().range(OFFER_TYPES);
 977                 let invreq_records = tlv_stream.range(INVOICE_REQUEST_TYPES).filter(|record| {
 978                         match record.r#type {
 979                                 PAYER_METADATA_TYPE => false, // Should be outside range
 980                                 INVOICE_REQUEST_PAYER_ID_TYPE => !self.derives_keys(),
 981                                 _ => true,
 982                         }
 983                 });
 984                 let tlv_stream = offer_records.chain(invreq_records);
 985
 986                 let (metadata, payer_id, iv_bytes) = match self {
 987                         InvoiceContents::ForOffer { invoice_request, .. } => {
 988                                 (invoice_request.metadata(), invoice_request.payer_id(), INVOICE_REQUEST_IV_BYTES)
 989                         },
 990                         InvoiceContents::ForRefund { refund, .. } => {
 991                                 (refund.metadata(), refund.payer_id(), REFUND_IV_BYTES)
 992                         },
 993                 };
 994
 995                 signer::verify_payer_metadata(metadata, key, iv_bytes, payer_id, tlv_stream, secp_ctx)
 996         }
 997
 998         fn derives_keys(&self) -> bool {
 999                 match self {
1000                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.derives_keys(),
1001                         InvoiceContents::ForRefund { refund, .. } => refund.derives_keys(),
1002                 }
1003         }
1004
1005         fn as_tlv_stream(&self) -> PartialInvoiceTlvStreamRef {
1006                 let (payer, offer, invoice_request) = match self {
1007                         InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.as_tlv_stream(),
1008                         InvoiceContents::ForRefund { refund, .. } => refund.as_tlv_stream(),
1009                 };
1010                 let invoice = self.fields().as_tlv_stream();
1011
1012                 (payer, offer, invoice_request, invoice)
1013         }
1014 }
1015
1016 impl InvoiceFields {
1017         fn as_tlv_stream(&self) -> InvoiceTlvStreamRef {
1018                 let features = {
1019                         if self.features == Bolt12InvoiceFeatures::empty() { None }
1020                         else { Some(&self.features) }
1021                 };
1022
1023                 InvoiceTlvStreamRef {
1024                         paths: Some(Iterable(self.payment_paths.iter().map(|(_, path)| path))),
1025                         blindedpay: Some(Iterable(self.payment_paths.iter().map(|(payinfo, _)| payinfo))),
1026                         created_at: Some(self.created_at.as_secs()),
1027                         relative_expiry: self.relative_expiry.map(|duration| duration.as_secs() as u32),
1028                         payment_hash: Some(&self.payment_hash),
1029                         amount: Some(self.amount_msats),
1030                         fallbacks: self.fallbacks.as_ref(),
1031                         features,
1032                         node_id: Some(&self.signing_pubkey),
1033                 }
1034         }
1035 }
1036
1037 impl Writeable for UnsignedBolt12Invoice {
1038         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
1039                 WithoutLength(&self.bytes).write(writer)
1040         }
1041 }
1042
1043 impl Writeable for Bolt12Invoice {
1044         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
1045                 WithoutLength(&self.bytes).write(writer)
1046         }
1047 }
1048
1049 impl Writeable for InvoiceContents {
1050         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
1051                 self.as_tlv_stream().write(writer)
1052         }
1053 }
1054
1055 impl TryFrom<Vec<u8>> for UnsignedBolt12Invoice {
1056         type Error = Bolt12ParseError;
1057
1058         fn try_from(bytes: Vec<u8>) -> Result<Self, Self::Error> {
1059                 let invoice = ParsedMessage::<PartialInvoiceTlvStream>::try_from(bytes)?;
1060                 let ParsedMessage { bytes, tlv_stream } = invoice;
1061                 let (
1062                         payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream,
1063                 ) = tlv_stream;
1064                 let contents = InvoiceContents::try_from(
1065                         (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream)
1066                 )?;
1067
1068                 let tagged_hash = TaggedHash::new(SIGNATURE_TAG, &bytes);
1069
1070                 Ok(UnsignedBolt12Invoice { bytes, contents, tagged_hash })
1071         }
1072 }
1073
1074 impl TryFrom<Vec<u8>> for Bolt12Invoice {
1075         type Error = Bolt12ParseError;
1076
1077         fn try_from(bytes: Vec<u8>) -> Result<Self, Self::Error> {
1078                 let parsed_invoice = ParsedMessage::<FullInvoiceTlvStream>::try_from(bytes)?;
1079                 Bolt12Invoice::try_from(parsed_invoice)
1080         }
1081 }
1082
1083 tlv_stream!(InvoiceTlvStream, InvoiceTlvStreamRef, 160..240, {
1084         (160, paths: (Vec<BlindedPath>, WithoutLength, Iterable<'a, BlindedPathIter<'a>, BlindedPath>)),
1085         (162, blindedpay: (Vec<BlindedPayInfo>, WithoutLength, Iterable<'a, BlindedPayInfoIter<'a>, BlindedPayInfo>)),
1086         (164, created_at: (u64, HighZeroBytesDroppedBigSize)),
1087         (166, relative_expiry: (u32, HighZeroBytesDroppedBigSize)),
1088         (168, payment_hash: PaymentHash),
1089         (170, amount: (u64, HighZeroBytesDroppedBigSize)),
1090         (172, fallbacks: (Vec<FallbackAddress>, WithoutLength)),
1091         (174, features: (Bolt12InvoiceFeatures, WithoutLength)),
1092         (176, node_id: PublicKey),
1093 });
1094
1095 type BlindedPathIter<'a> = core::iter::Map<
1096         core::slice::Iter<'a, (BlindedPayInfo, BlindedPath)>,
1097         for<'r> fn(&'r (BlindedPayInfo, BlindedPath)) -> &'r BlindedPath,
1098 >;
1099
1100 type BlindedPayInfoIter<'a> = core::iter::Map<
1101         core::slice::Iter<'a, (BlindedPayInfo, BlindedPath)>,
1102         for<'r> fn(&'r (BlindedPayInfo, BlindedPath)) -> &'r BlindedPayInfo,
1103 >;
1104
1105 /// Information needed to route a payment across a [`BlindedPath`].
1106 #[derive(Clone, Debug, Hash, Eq, PartialEq)]
1107 pub struct BlindedPayInfo {
1108         /// Base fee charged (in millisatoshi) for the entire blinded path.
1109         pub fee_base_msat: u32,
1110
1111         /// Liquidity fee charged (in millionths of the amount transferred) for the entire blinded path
1112         /// (i.e., 10,000 is 1%).
1113         pub fee_proportional_millionths: u32,
1114
1115         /// Number of blocks subtracted from an incoming HTLC's `cltv_expiry` for the entire blinded
1116         /// path.
1117         pub cltv_expiry_delta: u16,
1118
1119         /// The minimum HTLC value (in millisatoshi) that is acceptable to all channel peers on the
1120         /// blinded path from the introduction node to the recipient, accounting for any fees, i.e., as
1121         /// seen by the recipient.
1122         pub htlc_minimum_msat: u64,
1123
1124         /// The maximum HTLC value (in millisatoshi) that is acceptable to all channel peers on the
1125         /// blinded path from the introduction node to the recipient, accounting for any fees, i.e., as
1126         /// seen by the recipient.
1127         pub htlc_maximum_msat: u64,
1128
1129         /// Features set in `encrypted_data_tlv` for the `encrypted_recipient_data` TLV record in an
1130         /// onion payload.
1131         pub features: BlindedHopFeatures,
1132 }
1133
1134 impl_writeable!(BlindedPayInfo, {
1135         fee_base_msat,
1136         fee_proportional_millionths,
1137         cltv_expiry_delta,
1138         htlc_minimum_msat,
1139         htlc_maximum_msat,
1140         features
1141 });
1142
1143 /// Wire representation for an on-chain fallback address.
1144 #[derive(Clone, Debug, PartialEq)]
1145 pub(super) struct FallbackAddress {
1146         version: u8,
1147         program: Vec<u8>,
1148 }
1149
1150 impl_writeable!(FallbackAddress, { version, program });
1151
1152 type FullInvoiceTlvStream =
1153         (PayerTlvStream, OfferTlvStream, InvoiceRequestTlvStream, InvoiceTlvStream, SignatureTlvStream);
1154
1155 #[cfg(test)]
1156 type FullInvoiceTlvStreamRef<'a> = (
1157         PayerTlvStreamRef<'a>,
1158         OfferTlvStreamRef<'a>,
1159         InvoiceRequestTlvStreamRef<'a>,
1160         InvoiceTlvStreamRef<'a>,
1161         SignatureTlvStreamRef<'a>,
1162 );
1163
1164 impl SeekReadable for FullInvoiceTlvStream {
1165         fn read<R: io::Read + io::Seek>(r: &mut R) -> Result<Self, DecodeError> {
1166                 let payer = SeekReadable::read(r)?;
1167                 let offer = SeekReadable::read(r)?;
1168                 let invoice_request = SeekReadable::read(r)?;
1169                 let invoice = SeekReadable::read(r)?;
1170                 let signature = SeekReadable::read(r)?;
1171
1172                 Ok((payer, offer, invoice_request, invoice, signature))
1173         }
1174 }
1175
1176 type PartialInvoiceTlvStream =
1177         (PayerTlvStream, OfferTlvStream, InvoiceRequestTlvStream, InvoiceTlvStream);
1178
1179 type PartialInvoiceTlvStreamRef<'a> = (
1180         PayerTlvStreamRef<'a>,
1181         OfferTlvStreamRef<'a>,
1182         InvoiceRequestTlvStreamRef<'a>,
1183         InvoiceTlvStreamRef<'a>,
1184 );
1185
1186 impl SeekReadable for PartialInvoiceTlvStream {
1187         fn read<R: io::Read + io::Seek>(r: &mut R) -> Result<Self, DecodeError> {
1188                 let payer = SeekReadable::read(r)?;
1189                 let offer = SeekReadable::read(r)?;
1190                 let invoice_request = SeekReadable::read(r)?;
1191                 let invoice = SeekReadable::read(r)?;
1192
1193                 Ok((payer, offer, invoice_request, invoice))
1194         }
1195 }
1196
1197 impl TryFrom<ParsedMessage<FullInvoiceTlvStream>> for Bolt12Invoice {
1198         type Error = Bolt12ParseError;
1199
1200         fn try_from(invoice: ParsedMessage<FullInvoiceTlvStream>) -> Result<Self, Self::Error> {
1201                 let ParsedMessage { bytes, tlv_stream } = invoice;
1202                 let (
1203                         payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream,
1204                         SignatureTlvStream { signature },
1205                 ) = tlv_stream;
1206                 let contents = InvoiceContents::try_from(
1207                         (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream)
1208                 )?;
1209
1210                 let signature = match signature {
1211                         None => return Err(Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingSignature)),
1212                         Some(signature) => signature,
1213                 };
1214                 let tagged_hash = TaggedHash::new(SIGNATURE_TAG, &bytes);
1215                 let pubkey = contents.fields().signing_pubkey;
1216                 merkle::verify_signature(&signature, &tagged_hash, pubkey)?;
1217
1218                 Ok(Bolt12Invoice { bytes, contents, signature, tagged_hash })
1219         }
1220 }
1221
1222 impl TryFrom<PartialInvoiceTlvStream> for InvoiceContents {
1223         type Error = Bolt12SemanticError;
1224
1225         fn try_from(tlv_stream: PartialInvoiceTlvStream) -> Result<Self, Self::Error> {
1226                 let (
1227                         payer_tlv_stream,
1228                         offer_tlv_stream,
1229                         invoice_request_tlv_stream,
1230                         InvoiceTlvStream {
1231                                 paths, blindedpay, created_at, relative_expiry, payment_hash, amount, fallbacks,
1232                                 features, node_id,
1233                         },
1234                 ) = tlv_stream;
1235
1236                 let payment_paths = match (blindedpay, paths) {
1237                         (_, None) => return Err(Bolt12SemanticError::MissingPaths),
1238                         (None, _) => return Err(Bolt12SemanticError::InvalidPayInfo),
1239                         (_, Some(paths)) if paths.is_empty() => return Err(Bolt12SemanticError::MissingPaths),
1240                         (Some(blindedpay), Some(paths)) if paths.len() != blindedpay.len() => {
1241                                 return Err(Bolt12SemanticError::InvalidPayInfo);
1242                         },
1243                         (Some(blindedpay), Some(paths)) => {
1244                                 blindedpay.into_iter().zip(paths.into_iter()).collect::<Vec<_>>()
1245                         },
1246                 };
1247
1248                 let created_at = match created_at {
1249                         None => return Err(Bolt12SemanticError::MissingCreationTime),
1250                         Some(timestamp) => Duration::from_secs(timestamp),
1251                 };
1252
1253                 let relative_expiry = relative_expiry
1254                         .map(Into::<u64>::into)
1255                         .map(Duration::from_secs);
1256
1257                 let payment_hash = match payment_hash {
1258                         None => return Err(Bolt12SemanticError::MissingPaymentHash),
1259                         Some(payment_hash) => payment_hash,
1260                 };
1261
1262                 let amount_msats = match amount {
1263                         None => return Err(Bolt12SemanticError::MissingAmount),
1264                         Some(amount) => amount,
1265                 };
1266
1267                 let features = features.unwrap_or_else(Bolt12InvoiceFeatures::empty);
1268
1269                 let signing_pubkey = match node_id {
1270                         None => return Err(Bolt12SemanticError::MissingSigningPubkey),
1271                         Some(node_id) => node_id,
1272                 };
1273
1274                 let fields = InvoiceFields {
1275                         payment_paths, created_at, relative_expiry, payment_hash, amount_msats, fallbacks,
1276                         features, signing_pubkey,
1277                 };
1278
1279                 match offer_tlv_stream.node_id {
1280                         Some(expected_signing_pubkey) => {
1281                                 if fields.signing_pubkey != expected_signing_pubkey {
1282                                         return Err(Bolt12SemanticError::InvalidSigningPubkey);
1283                                 }
1284
1285                                 let invoice_request = InvoiceRequestContents::try_from(
1286                                         (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream)
1287                                 )?;
1288                                 Ok(InvoiceContents::ForOffer { invoice_request, fields })
1289                         },
1290                         None => {
1291                                 let refund = RefundContents::try_from(
1292                                         (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream)
1293                                 )?;
1294                                 Ok(InvoiceContents::ForRefund { refund, fields })
1295                         },
1296                 }
1297         }
1298 }
1299
1300 #[cfg(test)]
1301 mod tests {
1302         use super::{Bolt12Invoice, DEFAULT_RELATIVE_EXPIRY, FallbackAddress, FullInvoiceTlvStreamRef, InvoiceTlvStreamRef, SIGNATURE_TAG, UnsignedBolt12Invoice};
1303
1304         use bitcoin::blockdata::constants::ChainHash;
1305         use bitcoin::blockdata::script::ScriptBuf;
1306         use bitcoin::hashes::Hash;
1307         use bitcoin::network::constants::Network;
1308         use bitcoin::secp256k1::{Message, Secp256k1, XOnlyPublicKey, self};
1309         use bitcoin::address::{Address, Payload, WitnessProgram, WitnessVersion};
1310         use bitcoin::key::TweakedPublicKey;
1311         use core::convert::TryFrom;
1312         use core::time::Duration;
1313         use crate::blinded_path::{BlindedHop, BlindedPath};
1314         use crate::sign::KeyMaterial;
1315         use crate::ln::features::{Bolt12InvoiceFeatures, InvoiceRequestFeatures, OfferFeatures};
1316         use crate::ln::inbound_payment::ExpandedKey;
1317         use crate::ln::msgs::DecodeError;
1318         use crate::offers::invoice_request::InvoiceRequestTlvStreamRef;
1319         use crate::offers::merkle::{SignError, SignatureTlvStreamRef, TaggedHash, self};
1320         use crate::offers::offer::{Amount, OfferBuilder, OfferTlvStreamRef, Quantity};
1321         use crate::offers::parse::{Bolt12ParseError, Bolt12SemanticError};
1322         use crate::offers::payer::PayerTlvStreamRef;
1323         use crate::offers::refund::RefundBuilder;
1324         use crate::offers::test_utils::*;
1325         use crate::util::ser::{BigSize, Iterable, Writeable};
1326         use crate::util::string::PrintableString;
1327
1328         trait ToBytes {
1329                 fn to_bytes(&self) -> Vec<u8>;
1330         }
1331
1332         impl<'a> ToBytes for FullInvoiceTlvStreamRef<'a> {
1333                 fn to_bytes(&self) -> Vec<u8> {
1334                         let mut buffer = Vec::new();
1335                         self.0.write(&mut buffer).unwrap();
1336                         self.1.write(&mut buffer).unwrap();
1337                         self.2.write(&mut buffer).unwrap();
1338                         self.3.write(&mut buffer).unwrap();
1339                         self.4.write(&mut buffer).unwrap();
1340                         buffer
1341                 }
1342         }
1343
1344         #[test]
1345         fn builds_invoice_for_offer_with_defaults() {
1346                 let payment_paths = payment_paths();
1347                 let payment_hash = payment_hash();
1348                 let now = now();
1349                 let unsigned_invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1350                         .amount_msats(1000)
1351                         .build().unwrap()
1352                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1353                         .build().unwrap()
1354                         .sign(payer_sign).unwrap()
1355                         .respond_with_no_std(payment_paths.clone(), payment_hash, now).unwrap()
1356                         .build().unwrap();
1357
1358                 let mut buffer = Vec::new();
1359                 unsigned_invoice.write(&mut buffer).unwrap();
1360
1361                 assert_eq!(unsigned_invoice.bytes, buffer.as_slice());
1362                 assert_eq!(unsigned_invoice.payer_metadata(), &[1; 32]);
1363                 assert_eq!(unsigned_invoice.offer_chains(), Some(vec![ChainHash::using_genesis_block(Network::Bitcoin)]));
1364                 assert_eq!(unsigned_invoice.metadata(), None);
1365                 assert_eq!(unsigned_invoice.amount(), Some(&Amount::Bitcoin { amount_msats: 1000 }));
1366                 assert_eq!(unsigned_invoice.description(), PrintableString("foo"));
1367                 assert_eq!(unsigned_invoice.offer_features(), Some(&OfferFeatures::empty()));
1368                 assert_eq!(unsigned_invoice.absolute_expiry(), None);
1369                 assert_eq!(unsigned_invoice.message_paths(), &[]);
1370                 assert_eq!(unsigned_invoice.issuer(), None);
1371                 assert_eq!(unsigned_invoice.supported_quantity(), Some(Quantity::One));
1372                 assert_eq!(unsigned_invoice.signing_pubkey(), recipient_pubkey());
1373                 assert_eq!(unsigned_invoice.chain(), ChainHash::using_genesis_block(Network::Bitcoin));
1374                 assert_eq!(unsigned_invoice.amount_msats(), 1000);
1375                 assert_eq!(unsigned_invoice.invoice_request_features(), &InvoiceRequestFeatures::empty());
1376                 assert_eq!(unsigned_invoice.quantity(), None);
1377                 assert_eq!(unsigned_invoice.payer_id(), payer_pubkey());
1378                 assert_eq!(unsigned_invoice.payer_note(), None);
1379                 assert_eq!(unsigned_invoice.payment_paths(), payment_paths.as_slice());
1380                 assert_eq!(unsigned_invoice.created_at(), now);
1381                 assert_eq!(unsigned_invoice.relative_expiry(), DEFAULT_RELATIVE_EXPIRY);
1382                 #[cfg(feature = "std")]
1383                 assert!(!unsigned_invoice.is_expired());
1384                 assert_eq!(unsigned_invoice.payment_hash(), payment_hash);
1385                 assert_eq!(unsigned_invoice.amount_msats(), 1000);
1386                 assert_eq!(unsigned_invoice.fallbacks(), vec![]);
1387                 assert_eq!(unsigned_invoice.invoice_features(), &Bolt12InvoiceFeatures::empty());
1388                 assert_eq!(unsigned_invoice.signing_pubkey(), recipient_pubkey());
1389
1390                 match UnsignedBolt12Invoice::try_from(buffer) {
1391                         Err(e) => panic!("error parsing unsigned invoice: {:?}", e),
1392                         Ok(parsed) => {
1393                                 assert_eq!(parsed.bytes, unsigned_invoice.bytes);
1394                                 assert_eq!(parsed.tagged_hash, unsigned_invoice.tagged_hash);
1395                         },
1396                 }
1397
1398                 let invoice = unsigned_invoice.sign(recipient_sign).unwrap();
1399
1400                 let mut buffer = Vec::new();
1401                 invoice.write(&mut buffer).unwrap();
1402
1403                 assert_eq!(invoice.bytes, buffer.as_slice());
1404                 assert_eq!(invoice.payer_metadata(), &[1; 32]);
1405                 assert_eq!(invoice.offer_chains(), Some(vec![ChainHash::using_genesis_block(Network::Bitcoin)]));
1406                 assert_eq!(invoice.metadata(), None);
1407                 assert_eq!(invoice.amount(), Some(&Amount::Bitcoin { amount_msats: 1000 }));
1408                 assert_eq!(invoice.description(), PrintableString("foo"));
1409                 assert_eq!(invoice.offer_features(), Some(&OfferFeatures::empty()));
1410                 assert_eq!(invoice.absolute_expiry(), None);
1411                 assert_eq!(invoice.message_paths(), &[]);
1412                 assert_eq!(invoice.issuer(), None);
1413                 assert_eq!(invoice.supported_quantity(), Some(Quantity::One));
1414                 assert_eq!(invoice.signing_pubkey(), recipient_pubkey());
1415                 assert_eq!(invoice.chain(), ChainHash::using_genesis_block(Network::Bitcoin));
1416                 assert_eq!(invoice.amount_msats(), 1000);
1417                 assert_eq!(invoice.invoice_request_features(), &InvoiceRequestFeatures::empty());
1418                 assert_eq!(invoice.quantity(), None);
1419                 assert_eq!(invoice.payer_id(), payer_pubkey());
1420                 assert_eq!(invoice.payer_note(), None);
1421                 assert_eq!(invoice.payment_paths(), payment_paths.as_slice());
1422                 assert_eq!(invoice.created_at(), now);
1423                 assert_eq!(invoice.relative_expiry(), DEFAULT_RELATIVE_EXPIRY);
1424                 #[cfg(feature = "std")]
1425                 assert!(!invoice.is_expired());
1426                 assert_eq!(invoice.payment_hash(), payment_hash);
1427                 assert_eq!(invoice.amount_msats(), 1000);
1428                 assert_eq!(invoice.fallbacks(), vec![]);
1429                 assert_eq!(invoice.invoice_features(), &Bolt12InvoiceFeatures::empty());
1430                 assert_eq!(invoice.signing_pubkey(), recipient_pubkey());
1431
1432                 let message = TaggedHash::new(SIGNATURE_TAG, &invoice.bytes);
1433                 assert!(merkle::verify_signature(&invoice.signature, &message, recipient_pubkey()).is_ok());
1434
1435                 let digest = Message::from_slice(&invoice.signable_hash()).unwrap();
1436                 let pubkey = recipient_pubkey().into();
1437                 let secp_ctx = Secp256k1::verification_only();
1438                 assert!(secp_ctx.verify_schnorr(&invoice.signature, &digest, &pubkey).is_ok());
1439
1440                 assert_eq!(
1441                         invoice.as_tlv_stream(),
1442                         (
1443                                 PayerTlvStreamRef { metadata: Some(&vec![1; 32]) },
1444                                 OfferTlvStreamRef {
1445                                         chains: None,
1446                                         metadata: None,
1447                                         currency: None,
1448                                         amount: Some(1000),
1449                                         description: Some(&String::from("foo")),
1450                                         features: None,
1451                                         absolute_expiry: None,
1452                                         paths: None,
1453                                         issuer: None,
1454                                         quantity_max: None,
1455                                         node_id: Some(&recipient_pubkey()),
1456                                 },
1457                                 InvoiceRequestTlvStreamRef {
1458                                         chain: None,
1459                                         amount: None,
1460                                         features: None,
1461                                         quantity: None,
1462                                         payer_id: Some(&payer_pubkey()),
1463                                         payer_note: None,
1464                                 },
1465                                 InvoiceTlvStreamRef {
1466                                         paths: Some(Iterable(payment_paths.iter().map(|(_, path)| path))),
1467                                         blindedpay: Some(Iterable(payment_paths.iter().map(|(payinfo, _)| payinfo))),
1468                                         created_at: Some(now.as_secs()),
1469                                         relative_expiry: None,
1470                                         payment_hash: Some(&payment_hash),
1471                                         amount: Some(1000),
1472                                         fallbacks: None,
1473                                         features: None,
1474                                         node_id: Some(&recipient_pubkey()),
1475                                 },
1476                                 SignatureTlvStreamRef { signature: Some(&invoice.signature()) },
1477                         ),
1478                 );
1479
1480                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
1481                         panic!("error parsing invoice: {:?}", e);
1482                 }
1483         }
1484
1485         #[test]
1486         fn builds_invoice_for_refund_with_defaults() {
1487                 let payment_paths = payment_paths();
1488                 let payment_hash = payment_hash();
1489                 let now = now();
1490                 let invoice = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1491                         .build().unwrap()
1492                         .respond_with_no_std(payment_paths.clone(), payment_hash, recipient_pubkey(), now)
1493                         .unwrap()
1494                         .build().unwrap()
1495                         .sign(recipient_sign).unwrap();
1496
1497                 let mut buffer = Vec::new();
1498                 invoice.write(&mut buffer).unwrap();
1499
1500                 assert_eq!(invoice.bytes, buffer.as_slice());
1501                 assert_eq!(invoice.payer_metadata(), &[1; 32]);
1502                 assert_eq!(invoice.offer_chains(), None);
1503                 assert_eq!(invoice.metadata(), None);
1504                 assert_eq!(invoice.amount(), None);
1505                 assert_eq!(invoice.description(), PrintableString("foo"));
1506                 assert_eq!(invoice.offer_features(), None);
1507                 assert_eq!(invoice.absolute_expiry(), None);
1508                 assert_eq!(invoice.message_paths(), &[]);
1509                 assert_eq!(invoice.issuer(), None);
1510                 assert_eq!(invoice.supported_quantity(), None);
1511                 assert_eq!(invoice.signing_pubkey(), recipient_pubkey());
1512                 assert_eq!(invoice.chain(), ChainHash::using_genesis_block(Network::Bitcoin));
1513                 assert_eq!(invoice.amount_msats(), 1000);
1514                 assert_eq!(invoice.invoice_request_features(), &InvoiceRequestFeatures::empty());
1515                 assert_eq!(invoice.quantity(), None);
1516                 assert_eq!(invoice.payer_id(), payer_pubkey());
1517                 assert_eq!(invoice.payer_note(), None);
1518                 assert_eq!(invoice.payment_paths(), payment_paths.as_slice());
1519                 assert_eq!(invoice.created_at(), now);
1520                 assert_eq!(invoice.relative_expiry(), DEFAULT_RELATIVE_EXPIRY);
1521                 #[cfg(feature = "std")]
1522                 assert!(!invoice.is_expired());
1523                 assert_eq!(invoice.payment_hash(), payment_hash);
1524                 assert_eq!(invoice.amount_msats(), 1000);
1525                 assert_eq!(invoice.fallbacks(), vec![]);
1526                 assert_eq!(invoice.invoice_features(), &Bolt12InvoiceFeatures::empty());
1527                 assert_eq!(invoice.signing_pubkey(), recipient_pubkey());
1528
1529                 let message = TaggedHash::new(SIGNATURE_TAG, &invoice.bytes);
1530                 assert!(merkle::verify_signature(&invoice.signature, &message, recipient_pubkey()).is_ok());
1531
1532                 assert_eq!(
1533                         invoice.as_tlv_stream(),
1534                         (
1535                                 PayerTlvStreamRef { metadata: Some(&vec![1; 32]) },
1536                                 OfferTlvStreamRef {
1537                                         chains: None,
1538                                         metadata: None,
1539                                         currency: None,
1540                                         amount: None,
1541                                         description: Some(&String::from("foo")),
1542                                         features: None,
1543                                         absolute_expiry: None,
1544                                         paths: None,
1545                                         issuer: None,
1546                                         quantity_max: None,
1547                                         node_id: None,
1548                                 },
1549                                 InvoiceRequestTlvStreamRef {
1550                                         chain: None,
1551                                         amount: Some(1000),
1552                                         features: None,
1553                                         quantity: None,
1554                                         payer_id: Some(&payer_pubkey()),
1555                                         payer_note: None,
1556                                 },
1557                                 InvoiceTlvStreamRef {
1558                                         paths: Some(Iterable(payment_paths.iter().map(|(_, path)| path))),
1559                                         blindedpay: Some(Iterable(payment_paths.iter().map(|(payinfo, _)| payinfo))),
1560                                         created_at: Some(now.as_secs()),
1561                                         relative_expiry: None,
1562                                         payment_hash: Some(&payment_hash),
1563                                         amount: Some(1000),
1564                                         fallbacks: None,
1565                                         features: None,
1566                                         node_id: Some(&recipient_pubkey()),
1567                                 },
1568                                 SignatureTlvStreamRef { signature: Some(&invoice.signature()) },
1569                         ),
1570                 );
1571
1572                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
1573                         panic!("error parsing invoice: {:?}", e);
1574                 }
1575         }
1576
1577         #[cfg(feature = "std")]
1578         #[test]
1579         fn builds_invoice_from_offer_with_expiration() {
1580                 let future_expiry = Duration::from_secs(u64::max_value());
1581                 let past_expiry = Duration::from_secs(0);
1582
1583                 if let Err(e) = OfferBuilder::new("foo".into(), recipient_pubkey())
1584                         .amount_msats(1000)
1585                         .absolute_expiry(future_expiry)
1586                         .build().unwrap()
1587                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1588                         .build().unwrap()
1589                         .sign(payer_sign).unwrap()
1590                         .respond_with(payment_paths(), payment_hash())
1591                         .unwrap()
1592                         .build()
1593                 {
1594                         panic!("error building invoice: {:?}", e);
1595                 }
1596
1597                 match OfferBuilder::new("foo".into(), recipient_pubkey())
1598                         .amount_msats(1000)
1599                         .absolute_expiry(past_expiry)
1600                         .build().unwrap()
1601                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1602                         .build_unchecked()
1603                         .sign(payer_sign).unwrap()
1604                         .respond_with(payment_paths(), payment_hash())
1605                         .unwrap()
1606                         .build()
1607                 {
1608                         Ok(_) => panic!("expected error"),
1609                         Err(e) => assert_eq!(e, Bolt12SemanticError::AlreadyExpired),
1610                 }
1611         }
1612
1613         #[cfg(feature = "std")]
1614         #[test]
1615         fn builds_invoice_from_refund_with_expiration() {
1616                 let future_expiry = Duration::from_secs(u64::max_value());
1617                 let past_expiry = Duration::from_secs(0);
1618
1619                 if let Err(e) = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1620                         .absolute_expiry(future_expiry)
1621                         .build().unwrap()
1622                         .respond_with(payment_paths(), payment_hash(), recipient_pubkey())
1623                         .unwrap()
1624                         .build()
1625                 {
1626                         panic!("error building invoice: {:?}", e);
1627                 }
1628
1629                 match RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1630                         .absolute_expiry(past_expiry)
1631                         .build().unwrap()
1632                         .respond_with(payment_paths(), payment_hash(), recipient_pubkey())
1633                         .unwrap()
1634                         .build()
1635                 {
1636                         Ok(_) => panic!("expected error"),
1637                         Err(e) => assert_eq!(e, Bolt12SemanticError::AlreadyExpired),
1638                 }
1639         }
1640
1641         #[test]
1642         fn builds_invoice_from_offer_using_derived_keys() {
1643                 let desc = "foo".to_string();
1644                 let node_id = recipient_pubkey();
1645                 let expanded_key = ExpandedKey::new(&KeyMaterial([42; 32]));
1646                 let entropy = FixedEntropy {};
1647                 let secp_ctx = Secp256k1::new();
1648
1649                 let blinded_path = BlindedPath {
1650                         introduction_node_id: pubkey(40),
1651                         blinding_point: pubkey(41),
1652                         blinded_hops: vec![
1653                                 BlindedHop { blinded_node_id: pubkey(42), encrypted_payload: vec![0; 43] },
1654                                 BlindedHop { blinded_node_id: node_id, encrypted_payload: vec![0; 44] },
1655                         ],
1656                 };
1657
1658                 let offer = OfferBuilder
1659                         ::deriving_signing_pubkey(desc, node_id, &expanded_key, &entropy, &secp_ctx)
1660                         .amount_msats(1000)
1661                         .path(blinded_path)
1662                         .build().unwrap();
1663                 let invoice_request = offer.request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1664                         .build().unwrap()
1665                         .sign(payer_sign).unwrap();
1666
1667                 if let Err(e) = invoice_request.clone()
1668                         .verify(&expanded_key, &secp_ctx).unwrap()
1669                         .respond_using_derived_keys_no_std(payment_paths(), payment_hash(), now()).unwrap()
1670                         .build_and_sign(&secp_ctx)
1671                 {
1672                         panic!("error building invoice: {:?}", e);
1673                 }
1674
1675                 let expanded_key = ExpandedKey::new(&KeyMaterial([41; 32]));
1676                 assert!(invoice_request.verify(&expanded_key, &secp_ctx).is_err());
1677
1678                 let desc = "foo".to_string();
1679                 let offer = OfferBuilder
1680                         ::deriving_signing_pubkey(desc, node_id, &expanded_key, &entropy, &secp_ctx)
1681                         .amount_msats(1000)
1682                         // Omit the path so that node_id is used for the signing pubkey instead of deriving
1683                         .build().unwrap();
1684                 let invoice_request = offer.request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1685                         .build().unwrap()
1686                         .sign(payer_sign).unwrap();
1687
1688                 match invoice_request
1689                         .verify(&expanded_key, &secp_ctx).unwrap()
1690                         .respond_using_derived_keys_no_std(payment_paths(), payment_hash(), now())
1691                 {
1692                         Ok(_) => panic!("expected error"),
1693                         Err(e) => assert_eq!(e, Bolt12SemanticError::InvalidMetadata),
1694                 }
1695         }
1696
1697         #[test]
1698         fn builds_invoice_from_refund_using_derived_keys() {
1699                 let expanded_key = ExpandedKey::new(&KeyMaterial([42; 32]));
1700                 let entropy = FixedEntropy {};
1701                 let secp_ctx = Secp256k1::new();
1702
1703                 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1704                         .build().unwrap();
1705
1706                 if let Err(e) = refund
1707                         .respond_using_derived_keys_no_std(
1708                                 payment_paths(), payment_hash(), now(), &expanded_key, &entropy
1709                         )
1710                         .unwrap()
1711                         .build_and_sign(&secp_ctx)
1712                 {
1713                         panic!("error building invoice: {:?}", e);
1714                 }
1715         }
1716
1717         #[test]
1718         fn builds_invoice_with_relative_expiry() {
1719                 let now = now();
1720                 let one_hour = Duration::from_secs(3600);
1721
1722                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1723                         .amount_msats(1000)
1724                         .build().unwrap()
1725                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1726                         .build().unwrap()
1727                         .sign(payer_sign).unwrap()
1728                         .respond_with_no_std(payment_paths(), payment_hash(), now).unwrap()
1729                         .relative_expiry(one_hour.as_secs() as u32)
1730                         .build().unwrap()
1731                         .sign(recipient_sign).unwrap();
1732                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1733                 #[cfg(feature = "std")]
1734                 assert!(!invoice.is_expired());
1735                 assert_eq!(invoice.relative_expiry(), one_hour);
1736                 assert_eq!(tlv_stream.relative_expiry, Some(one_hour.as_secs() as u32));
1737
1738                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1739                         .amount_msats(1000)
1740                         .build().unwrap()
1741                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1742                         .build().unwrap()
1743                         .sign(payer_sign).unwrap()
1744                         .respond_with_no_std(payment_paths(), payment_hash(), now - one_hour).unwrap()
1745                         .relative_expiry(one_hour.as_secs() as u32 - 1)
1746                         .build().unwrap()
1747                         .sign(recipient_sign).unwrap();
1748                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1749                 #[cfg(feature = "std")]
1750                 assert!(invoice.is_expired());
1751                 assert_eq!(invoice.relative_expiry(), one_hour - Duration::from_secs(1));
1752                 assert_eq!(tlv_stream.relative_expiry, Some(one_hour.as_secs() as u32 - 1));
1753         }
1754
1755         #[test]
1756         fn builds_invoice_with_amount_from_request() {
1757                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1758                         .amount_msats(1000)
1759                         .build().unwrap()
1760                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1761                         .amount_msats(1001).unwrap()
1762                         .build().unwrap()
1763                         .sign(payer_sign).unwrap()
1764                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1765                         .build().unwrap()
1766                         .sign(recipient_sign).unwrap();
1767                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1768                 assert_eq!(invoice.amount_msats(), 1001);
1769                 assert_eq!(tlv_stream.amount, Some(1001));
1770         }
1771
1772         #[test]
1773         fn builds_invoice_with_quantity_from_request() {
1774                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1775                         .amount_msats(1000)
1776                         .supported_quantity(Quantity::Unbounded)
1777                         .build().unwrap()
1778                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1779                         .quantity(2).unwrap()
1780                         .build().unwrap()
1781                         .sign(payer_sign).unwrap()
1782                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1783                         .build().unwrap()
1784                         .sign(recipient_sign).unwrap();
1785                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1786                 assert_eq!(invoice.amount_msats(), 2000);
1787                 assert_eq!(tlv_stream.amount, Some(2000));
1788
1789                 match OfferBuilder::new("foo".into(), recipient_pubkey())
1790                         .amount_msats(1000)
1791                         .supported_quantity(Quantity::Unbounded)
1792                         .build().unwrap()
1793                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1794                         .quantity(u64::max_value()).unwrap()
1795                         .build_unchecked()
1796                         .sign(payer_sign).unwrap()
1797                         .respond_with_no_std(payment_paths(), payment_hash(), now())
1798                 {
1799                         Ok(_) => panic!("expected error"),
1800                         Err(e) => assert_eq!(e, Bolt12SemanticError::InvalidAmount),
1801                 }
1802         }
1803
1804         #[test]
1805         fn builds_invoice_with_fallback_address() {
1806                 let script = ScriptBuf::new();
1807                 let pubkey = bitcoin::key::PublicKey::new(recipient_pubkey());
1808                 let x_only_pubkey = XOnlyPublicKey::from_keypair(&recipient_keys()).0;
1809                 let tweaked_pubkey = TweakedPublicKey::dangerous_assume_tweaked(x_only_pubkey);
1810
1811                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1812                         .amount_msats(1000)
1813                         .build().unwrap()
1814                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1815                         .build().unwrap()
1816                         .sign(payer_sign).unwrap()
1817                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1818                         .fallback_v0_p2wsh(&script.wscript_hash())
1819                         .fallback_v0_p2wpkh(&pubkey.wpubkey_hash().unwrap())
1820                         .fallback_v1_p2tr_tweaked(&tweaked_pubkey)
1821                         .build().unwrap()
1822                         .sign(recipient_sign).unwrap();
1823                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1824                 assert_eq!(
1825                         invoice.fallbacks(),
1826                         vec![
1827                                 Address::p2wsh(&script, Network::Bitcoin),
1828                                 Address::p2wpkh(&pubkey, Network::Bitcoin).unwrap(),
1829                                 Address::p2tr_tweaked(tweaked_pubkey, Network::Bitcoin),
1830                         ],
1831                 );
1832                 assert_eq!(
1833                         tlv_stream.fallbacks,
1834                         Some(&vec![
1835                                 FallbackAddress {
1836                                         version: WitnessVersion::V0.to_num(),
1837                                         program: Vec::from(script.wscript_hash().to_byte_array()),
1838                                 },
1839                                 FallbackAddress {
1840                                         version: WitnessVersion::V0.to_num(),
1841                                         program: Vec::from(pubkey.wpubkey_hash().unwrap().to_byte_array()),
1842                                 },
1843                                 FallbackAddress {
1844                                         version: WitnessVersion::V1.to_num(),
1845                                         program: Vec::from(&tweaked_pubkey.serialize()[..]),
1846                                 },
1847                         ])
1848                 );
1849         }
1850
1851         #[test]
1852         fn builds_invoice_with_allow_mpp() {
1853                 let mut features = Bolt12InvoiceFeatures::empty();
1854                 features.set_basic_mpp_optional();
1855
1856                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1857                         .amount_msats(1000)
1858                         .build().unwrap()
1859                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1860                         .build().unwrap()
1861                         .sign(payer_sign).unwrap()
1862                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1863                         .allow_mpp()
1864                         .build().unwrap()
1865                         .sign(recipient_sign).unwrap();
1866                 let (_, _, _, tlv_stream, _) = invoice.as_tlv_stream();
1867                 assert_eq!(invoice.invoice_features(), &features);
1868                 assert_eq!(tlv_stream.features, Some(&features));
1869         }
1870
1871         #[test]
1872         fn fails_signing_invoice() {
1873                 match OfferBuilder::new("foo".into(), recipient_pubkey())
1874                         .amount_msats(1000)
1875                         .build().unwrap()
1876                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1877                         .build().unwrap()
1878                         .sign(payer_sign).unwrap()
1879                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1880                         .build().unwrap()
1881                         .sign(|_| Err(()))
1882                 {
1883                         Ok(_) => panic!("expected error"),
1884                         Err(e) => assert_eq!(e, SignError::Signing(())),
1885                 }
1886
1887                 match OfferBuilder::new("foo".into(), recipient_pubkey())
1888                         .amount_msats(1000)
1889                         .build().unwrap()
1890                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1891                         .build().unwrap()
1892                         .sign(payer_sign).unwrap()
1893                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1894                         .build().unwrap()
1895                         .sign(payer_sign)
1896                 {
1897                         Ok(_) => panic!("expected error"),
1898                         Err(e) => assert_eq!(e, SignError::Verification(secp256k1::Error::InvalidSignature)),
1899                 }
1900         }
1901
1902         #[test]
1903         fn parses_invoice_with_payment_paths() {
1904                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1905                         .amount_msats(1000)
1906                         .build().unwrap()
1907                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1908                         .build().unwrap()
1909                         .sign(payer_sign).unwrap()
1910                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1911                         .build().unwrap()
1912                         .sign(recipient_sign).unwrap();
1913
1914                 let mut buffer = Vec::new();
1915                 invoice.write(&mut buffer).unwrap();
1916
1917                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
1918                         panic!("error parsing invoice: {:?}", e);
1919                 }
1920
1921                 let mut tlv_stream = invoice.as_tlv_stream();
1922                 tlv_stream.3.paths = None;
1923
1924                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
1925                         Ok(_) => panic!("expected error"),
1926                         Err(e) => assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingPaths)),
1927                 }
1928
1929                 let mut tlv_stream = invoice.as_tlv_stream();
1930                 tlv_stream.3.blindedpay = None;
1931
1932                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
1933                         Ok(_) => panic!("expected error"),
1934                         Err(e) => assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::InvalidPayInfo)),
1935                 }
1936
1937                 let empty_payment_paths = vec![];
1938                 let mut tlv_stream = invoice.as_tlv_stream();
1939                 tlv_stream.3.paths = Some(Iterable(empty_payment_paths.iter().map(|(_, path)| path)));
1940
1941                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
1942                         Ok(_) => panic!("expected error"),
1943                         Err(e) => assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingPaths)),
1944                 }
1945
1946                 let mut payment_paths = payment_paths();
1947                 payment_paths.pop();
1948                 let mut tlv_stream = invoice.as_tlv_stream();
1949                 tlv_stream.3.blindedpay = Some(Iterable(payment_paths.iter().map(|(payinfo, _)| payinfo)));
1950
1951                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
1952                         Ok(_) => panic!("expected error"),
1953                         Err(e) => assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::InvalidPayInfo)),
1954                 }
1955         }
1956
1957         #[test]
1958         fn parses_invoice_with_created_at() {
1959                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1960                         .amount_msats(1000)
1961                         .build().unwrap()
1962                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1963                         .build().unwrap()
1964                         .sign(payer_sign).unwrap()
1965                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1966                         .build().unwrap()
1967                         .sign(recipient_sign).unwrap();
1968
1969                 let mut buffer = Vec::new();
1970                 invoice.write(&mut buffer).unwrap();
1971
1972                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
1973                         panic!("error parsing invoice: {:?}", e);
1974                 }
1975
1976                 let mut tlv_stream = invoice.as_tlv_stream();
1977                 tlv_stream.3.created_at = None;
1978
1979                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
1980                         Ok(_) => panic!("expected error"),
1981                         Err(e) => {
1982                                 assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingCreationTime));
1983                         },
1984                 }
1985         }
1986
1987         #[test]
1988         fn parses_invoice_with_relative_expiry() {
1989                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
1990                         .amount_msats(1000)
1991                         .build().unwrap()
1992                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1993                         .build().unwrap()
1994                         .sign(payer_sign).unwrap()
1995                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
1996                         .relative_expiry(3600)
1997                         .build().unwrap()
1998                         .sign(recipient_sign).unwrap();
1999
2000                 let mut buffer = Vec::new();
2001                 invoice.write(&mut buffer).unwrap();
2002
2003                 match Bolt12Invoice::try_from(buffer) {
2004                         Ok(invoice) => assert_eq!(invoice.relative_expiry(), Duration::from_secs(3600)),
2005                         Err(e) => panic!("error parsing invoice: {:?}", e),
2006                 }
2007         }
2008
2009         #[test]
2010         fn parses_invoice_with_payment_hash() {
2011                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
2012                         .amount_msats(1000)
2013                         .build().unwrap()
2014                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2015                         .build().unwrap()
2016                         .sign(payer_sign).unwrap()
2017                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2018                         .build().unwrap()
2019                         .sign(recipient_sign).unwrap();
2020
2021                 let mut buffer = Vec::new();
2022                 invoice.write(&mut buffer).unwrap();
2023
2024                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
2025                         panic!("error parsing invoice: {:?}", e);
2026                 }
2027
2028                 let mut tlv_stream = invoice.as_tlv_stream();
2029                 tlv_stream.3.payment_hash = None;
2030
2031                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
2032                         Ok(_) => panic!("expected error"),
2033                         Err(e) => {
2034                                 assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingPaymentHash));
2035                         },
2036                 }
2037         }
2038
2039         #[test]
2040         fn parses_invoice_with_amount() {
2041                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
2042                         .amount_msats(1000)
2043                         .build().unwrap()
2044                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2045                         .build().unwrap()
2046                         .sign(payer_sign).unwrap()
2047                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2048                         .build().unwrap()
2049                         .sign(recipient_sign).unwrap();
2050
2051                 let mut buffer = Vec::new();
2052                 invoice.write(&mut buffer).unwrap();
2053
2054                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
2055                         panic!("error parsing invoice: {:?}", e);
2056                 }
2057
2058                 let mut tlv_stream = invoice.as_tlv_stream();
2059                 tlv_stream.3.amount = None;
2060
2061                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
2062                         Ok(_) => panic!("expected error"),
2063                         Err(e) => assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingAmount)),
2064                 }
2065         }
2066
2067         #[test]
2068         fn parses_invoice_with_allow_mpp() {
2069                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
2070                         .amount_msats(1000)
2071                         .build().unwrap()
2072                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2073                         .build().unwrap()
2074                         .sign(payer_sign).unwrap()
2075                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2076                         .allow_mpp()
2077                         .build().unwrap()
2078                         .sign(recipient_sign).unwrap();
2079
2080                 let mut buffer = Vec::new();
2081                 invoice.write(&mut buffer).unwrap();
2082
2083                 match Bolt12Invoice::try_from(buffer) {
2084                         Ok(invoice) => {
2085                                 let mut features = Bolt12InvoiceFeatures::empty();
2086                                 features.set_basic_mpp_optional();
2087                                 assert_eq!(invoice.invoice_features(), &features);
2088                         },
2089                         Err(e) => panic!("error parsing invoice: {:?}", e),
2090                 }
2091         }
2092
2093         #[test]
2094         fn parses_invoice_with_fallback_address() {
2095                 let script = ScriptBuf::new();
2096                 let pubkey = bitcoin::key::PublicKey::new(recipient_pubkey());
2097                 let x_only_pubkey = XOnlyPublicKey::from_keypair(&recipient_keys()).0;
2098                 let tweaked_pubkey = TweakedPublicKey::dangerous_assume_tweaked(x_only_pubkey);
2099
2100                 let offer = OfferBuilder::new("foo".into(), recipient_pubkey())
2101                         .amount_msats(1000)
2102                         .build().unwrap();
2103                 let invoice_request = offer
2104                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2105                         .build().unwrap()
2106                         .sign(payer_sign).unwrap();
2107                 let mut invoice_builder = invoice_request
2108                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2109                         .fallback_v0_p2wsh(&script.wscript_hash())
2110                         .fallback_v0_p2wpkh(&pubkey.wpubkey_hash().unwrap())
2111                         .fallback_v1_p2tr_tweaked(&tweaked_pubkey);
2112
2113                 // Only standard addresses will be included.
2114                 let fallbacks = invoice_builder.invoice.fields_mut().fallbacks.as_mut().unwrap();
2115                 // Non-standard addresses
2116                 fallbacks.push(FallbackAddress { version: 1, program: vec![0u8; 41] });
2117                 fallbacks.push(FallbackAddress { version: 2, program: vec![0u8; 1] });
2118                 fallbacks.push(FallbackAddress { version: 17, program: vec![0u8; 40] });
2119                 // Standard address
2120                 fallbacks.push(FallbackAddress { version: 1, program: vec![0u8; 33] });
2121                 fallbacks.push(FallbackAddress { version: 2, program: vec![0u8; 40] });
2122
2123                 let invoice = invoice_builder.build().unwrap().sign(recipient_sign).unwrap();
2124                 let mut buffer = Vec::new();
2125                 invoice.write(&mut buffer).unwrap();
2126
2127                 match Bolt12Invoice::try_from(buffer) {
2128                         Ok(invoice) => {
2129                                 let v1_witness_program = WitnessProgram::new(WitnessVersion::V1, vec![0u8; 33]).unwrap();
2130                                 let v2_witness_program = WitnessProgram::new(WitnessVersion::V2, vec![0u8; 40]).unwrap();
2131                                 assert_eq!(
2132                                         invoice.fallbacks(),
2133                                         vec![
2134                                                 Address::p2wsh(&script, Network::Bitcoin),
2135                                                 Address::p2wpkh(&pubkey, Network::Bitcoin).unwrap(),
2136                                                 Address::p2tr_tweaked(tweaked_pubkey, Network::Bitcoin),
2137                                                 Address::new(Network::Bitcoin, Payload::WitnessProgram(v1_witness_program)),
2138                                                 Address::new(Network::Bitcoin, Payload::WitnessProgram(v2_witness_program)),
2139                                         ],
2140                                 );
2141                         },
2142                         Err(e) => panic!("error parsing invoice: {:?}", e),
2143                 }
2144         }
2145
2146         #[test]
2147         fn parses_invoice_with_node_id() {
2148                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
2149                         .amount_msats(1000)
2150                         .build().unwrap()
2151                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2152                         .build().unwrap()
2153                         .sign(payer_sign).unwrap()
2154                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2155                         .build().unwrap()
2156                         .sign(recipient_sign).unwrap();
2157
2158                 let mut buffer = Vec::new();
2159                 invoice.write(&mut buffer).unwrap();
2160
2161                 if let Err(e) = Bolt12Invoice::try_from(buffer) {
2162                         panic!("error parsing invoice: {:?}", e);
2163                 }
2164
2165                 let mut tlv_stream = invoice.as_tlv_stream();
2166                 tlv_stream.3.node_id = None;
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::MissingSigningPubkey));
2172                         },
2173                 }
2174
2175                 let invalid_pubkey = payer_pubkey();
2176                 let mut tlv_stream = invoice.as_tlv_stream();
2177                 tlv_stream.3.node_id = Some(&invalid_pubkey);
2178
2179                 match Bolt12Invoice::try_from(tlv_stream.to_bytes()) {
2180                         Ok(_) => panic!("expected error"),
2181                         Err(e) => {
2182                                 assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::InvalidSigningPubkey));
2183                         },
2184                 }
2185         }
2186
2187         #[test]
2188         fn fails_parsing_invoice_without_signature() {
2189                 let mut buffer = Vec::new();
2190                 OfferBuilder::new("foo".into(), recipient_pubkey())
2191                         .amount_msats(1000)
2192                         .build().unwrap()
2193                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2194                         .build().unwrap()
2195                         .sign(payer_sign).unwrap()
2196                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2197                         .build().unwrap()
2198                         .contents
2199                         .write(&mut buffer).unwrap();
2200
2201                 match Bolt12Invoice::try_from(buffer) {
2202                         Ok(_) => panic!("expected error"),
2203                         Err(e) => assert_eq!(e, Bolt12ParseError::InvalidSemantics(Bolt12SemanticError::MissingSignature)),
2204                 }
2205         }
2206
2207         #[test]
2208         fn fails_parsing_invoice_with_invalid_signature() {
2209                 let mut invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
2210                         .amount_msats(1000)
2211                         .build().unwrap()
2212                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2213                         .build().unwrap()
2214                         .sign(payer_sign).unwrap()
2215                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2216                         .build().unwrap()
2217                         .sign(recipient_sign).unwrap();
2218                 let last_signature_byte = invoice.bytes.last_mut().unwrap();
2219                 *last_signature_byte = last_signature_byte.wrapping_add(1);
2220
2221                 let mut buffer = Vec::new();
2222                 invoice.write(&mut buffer).unwrap();
2223
2224                 match Bolt12Invoice::try_from(buffer) {
2225                         Ok(_) => panic!("expected error"),
2226                         Err(e) => {
2227                                 assert_eq!(e, Bolt12ParseError::InvalidSignature(secp256k1::Error::InvalidSignature));
2228                         },
2229                 }
2230         }
2231
2232         #[test]
2233         fn fails_parsing_invoice_with_extra_tlv_records() {
2234                 let invoice = OfferBuilder::new("foo".into(), recipient_pubkey())
2235                         .amount_msats(1000)
2236                         .build().unwrap()
2237                         .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
2238                         .build().unwrap()
2239                         .sign(payer_sign).unwrap()
2240                         .respond_with_no_std(payment_paths(), payment_hash(), now()).unwrap()
2241                         .build().unwrap()
2242                         .sign(recipient_sign).unwrap();
2243
2244                 let mut encoded_invoice = Vec::new();
2245                 invoice.write(&mut encoded_invoice).unwrap();
2246                 BigSize(1002).write(&mut encoded_invoice).unwrap();
2247                 BigSize(32).write(&mut encoded_invoice).unwrap();
2248                 [42u8; 32].write(&mut encoded_invoice).unwrap();
2249
2250                 match Bolt12Invoice::try_from(encoded_invoice) {
2251                         Ok(_) => panic!("expected error"),
2252                         Err(e) => assert_eq!(e, Bolt12ParseError::Decode(DecodeError::InvalidValue)),
2253                 }
2254         }
2255 }