1 // This file is Copyright its original authors, visible in version control
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
10 //! Data structures and encoding for refunds.
12 //! A [`Refund`] is an "offer for money" and is typically constructed by a merchant and presented
13 //! directly to the customer. The recipient responds with an [`Invoice`] to be paid.
15 //! This is an [`InvoiceRequest`] produced *not* in response to an [`Offer`].
17 //! [`Invoice`]: crate::offers::invoice::Invoice
18 //! [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
19 //! [`Offer`]: crate::offers::offer::Offer
22 //! extern crate bitcoin;
23 //! extern crate core;
24 //! extern crate lightning;
26 //! use core::convert::TryFrom;
27 //! use core::time::Duration;
29 //! use bitcoin::network::constants::Network;
30 //! use bitcoin::secp256k1::{KeyPair, PublicKey, Secp256k1, SecretKey};
31 //! use lightning::offers::parse::ParseError;
32 //! use lightning::offers::refund::{Refund, RefundBuilder};
33 //! use lightning::util::ser::{Readable, Writeable};
35 //! # use lightning::onion_message::BlindedPath;
36 //! # #[cfg(feature = "std")]
37 //! # use std::time::SystemTime;
39 //! # fn create_blinded_path() -> BlindedPath { unimplemented!() }
40 //! # fn create_another_blinded_path() -> BlindedPath { unimplemented!() }
42 //! # #[cfg(feature = "std")]
43 //! # fn build() -> Result<(), ParseError> {
44 //! let secp_ctx = Secp256k1::new();
45 //! let keys = KeyPair::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
46 //! let pubkey = PublicKey::from(keys);
48 //! let expiration = SystemTime::now() + Duration::from_secs(24 * 60 * 60);
49 //! let refund = RefundBuilder::new("coffee, large".to_string(), vec![1; 32], pubkey, 20_000)?
50 //! .absolute_expiry(expiration.duration_since(SystemTime::UNIX_EPOCH).unwrap())
51 //! .issuer("Foo Bar".to_string())
52 //! .path(create_blinded_path())
53 //! .path(create_another_blinded_path())
54 //! .chain(Network::Bitcoin)
55 //! .payer_note("refund for order #12345".to_string())
58 //! // Encode as a bech32 string for use in a QR code.
59 //! let encoded_refund = refund.to_string();
61 //! // Parse from a bech32 string after scanning from a QR code.
62 //! let refund = encoded_refund.parse::<Refund>()?;
64 //! // Encode refund as raw bytes.
65 //! let mut bytes = Vec::new();
66 //! refund.write(&mut bytes).unwrap();
68 //! // Decode raw bytes into an refund.
69 //! let refund = Refund::try_from(bytes)?;
74 use bitcoin::blockdata::constants::ChainHash;
75 use bitcoin::network::constants::Network;
76 use bitcoin::secp256k1::{PublicKey, Secp256k1, self};
77 use core::convert::TryFrom;
79 use core::str::FromStr;
80 use core::time::Duration;
81 use crate::chain::keysinterface::EntropySource;
83 use crate::ln::PaymentHash;
84 use crate::ln::features::InvoiceRequestFeatures;
85 use crate::ln::inbound_payment::{ExpandedKey, IV_LEN, Nonce};
86 use crate::ln::msgs::{DecodeError, MAX_VALUE_MSAT};
87 use crate::offers::invoice::{BlindedPayInfo, InvoiceBuilder};
88 use crate::offers::invoice_request::{InvoiceRequestTlvStream, InvoiceRequestTlvStreamRef};
89 use crate::offers::offer::{OfferTlvStream, OfferTlvStreamRef};
90 use crate::offers::parse::{Bech32Encode, ParseError, ParsedMessage, SemanticError};
91 use crate::offers::payer::{PayerContents, PayerTlvStream, PayerTlvStreamRef};
92 use crate::offers::signer::{Metadata, MetadataMaterial};
93 use crate::onion_message::BlindedPath;
94 use crate::util::ser::{SeekReadable, WithoutLength, Writeable, Writer};
95 use crate::util::string::PrintableString;
97 use crate::prelude::*;
99 #[cfg(feature = "std")]
100 use std::time::SystemTime;
102 pub(super) const IV_BYTES: &[u8; IV_LEN] = b"LDK Refund ~~~~~";
104 /// Builds a [`Refund`] for the "offer for money" flow.
106 /// See [module-level documentation] for usage.
108 /// [module-level documentation]: self
109 pub struct RefundBuilder<'a, T: secp256k1::Signing> {
110 refund: RefundContents,
111 secp_ctx: Option<&'a Secp256k1<T>>,
114 impl<'a> RefundBuilder<'a, secp256k1::SignOnly> {
115 /// Creates a new builder for a refund using the [`Refund::payer_id`] for the public node id to
116 /// send to if no [`Refund::paths`] are set. Otherwise, it may be a transient pubkey.
118 /// Additionally, sets the required [`Refund::description`], [`Refund::metadata`], and
119 /// [`Refund::amount_msats`].
121 description: String, metadata: Vec<u8>, payer_id: PublicKey, amount_msats: u64
122 ) -> Result<Self, SemanticError> {
123 if amount_msats > MAX_VALUE_MSAT {
124 return Err(SemanticError::InvalidAmount);
127 let metadata = Metadata::Bytes(metadata);
129 refund: RefundContents {
130 payer: PayerContents(metadata), description, absolute_expiry: None, issuer: None,
131 paths: None, chain: None, amount_msats, features: InvoiceRequestFeatures::empty(),
132 quantity: None, payer_id, payer_note: None,
139 impl<'a, T: secp256k1::Signing> RefundBuilder<'a, T> {
140 /// Similar to [`RefundBuilder::new`] except, if [`RefundBuilder::path`] is called, the payer id
141 /// is derived from the given [`ExpandedKey`] and nonce. This provides sender privacy by using a
142 /// different payer id for each refund, assuming a different nonce is used. Otherwise, the
143 /// provided `node_id` is used for the payer id.
145 /// Also, sets the metadata when [`RefundBuilder::build`] is called such that it can be used to
146 /// verify that an [`InvoiceRequest`] was produced for the refund given an [`ExpandedKey`].
148 /// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
149 /// [`ExpandedKey`]: crate::ln::inbound_payment::ExpandedKey
150 pub fn deriving_payer_id<ES: Deref>(
151 description: String, node_id: PublicKey, expanded_key: &ExpandedKey, entropy_source: ES,
152 secp_ctx: &'a Secp256k1<T>, amount_msats: u64
153 ) -> Result<Self, SemanticError> where ES::Target: EntropySource {
154 if amount_msats > MAX_VALUE_MSAT {
155 return Err(SemanticError::InvalidAmount);
158 let nonce = Nonce::from_entropy_source(entropy_source);
159 let derivation_material = MetadataMaterial::new(nonce, expanded_key, IV_BYTES);
160 let metadata = Metadata::DerivedSigningPubkey(derivation_material);
162 refund: RefundContents {
163 payer: PayerContents(metadata), description, absolute_expiry: None, issuer: None,
164 paths: None, chain: None, amount_msats, features: InvoiceRequestFeatures::empty(),
165 quantity: None, payer_id: node_id, payer_note: None,
167 secp_ctx: Some(secp_ctx),
171 /// Sets the [`Refund::absolute_expiry`] as seconds since the Unix epoch. Any expiry that has
172 /// already passed is valid and can be checked for using [`Refund::is_expired`].
174 /// Successive calls to this method will override the previous setting.
175 pub fn absolute_expiry(mut self, absolute_expiry: Duration) -> Self {
176 self.refund.absolute_expiry = Some(absolute_expiry);
180 /// Sets the [`Refund::issuer`].
182 /// Successive calls to this method will override the previous setting.
183 pub fn issuer(mut self, issuer: String) -> Self {
184 self.refund.issuer = Some(issuer);
188 /// Adds a blinded path to [`Refund::paths`]. Must include at least one path if only connected
189 /// by private channels or if [`Refund::payer_id`] is not a public node id.
191 /// Successive calls to this method will add another blinded path. Caller is responsible for not
192 /// adding duplicate paths.
193 pub fn path(mut self, path: BlindedPath) -> Self {
194 self.refund.paths.get_or_insert_with(Vec::new).push(path);
198 /// Sets the [`Refund::chain`] of the given [`Network`] for paying an invoice. If not
199 /// called, [`Network::Bitcoin`] is assumed.
201 /// Successive calls to this method will override the previous setting.
202 pub fn chain(mut self, network: Network) -> Self {
203 self.refund.chain = Some(ChainHash::using_genesis_block(network));
207 /// Sets [`Refund::quantity`] of items. This is purely for informational purposes. It is useful
208 /// when the refund pertains to an [`Invoice`] that paid for more than one item from an
209 /// [`Offer`] as specified by [`InvoiceRequest::quantity`].
211 /// Successive calls to this method will override the previous setting.
213 /// [`Invoice`]: crate::offers::invoice::Invoice
214 /// [`InvoiceRequest::quantity`]: crate::offers::invoice_request::InvoiceRequest::quantity
215 /// [`Offer`]: crate::offers::offer::Offer
216 pub fn quantity(mut self, quantity: u64) -> Self {
217 self.refund.quantity = Some(quantity);
221 /// Sets the [`Refund::payer_note`].
223 /// Successive calls to this method will override the previous setting.
224 pub fn payer_note(mut self, payer_note: String) -> Self {
225 self.refund.payer_note = Some(payer_note);
229 /// Builds a [`Refund`] after checking for valid semantics.
230 pub fn build(mut self) -> Result<Refund, SemanticError> {
231 if self.refund.chain() == self.refund.implied_chain() {
232 self.refund.chain = None;
235 // Create the metadata for stateless verification of an Invoice.
236 if self.refund.payer.0.has_derivation_material() {
237 let mut metadata = core::mem::take(&mut self.refund.payer.0);
239 if self.refund.paths.is_none() {
240 metadata = metadata.without_keys();
243 let mut tlv_stream = self.refund.as_tlv_stream();
244 tlv_stream.0.metadata = None;
245 if metadata.derives_keys() {
246 tlv_stream.2.payer_id = None;
249 let (derived_metadata, keys) = metadata.derive_from(tlv_stream, self.secp_ctx);
250 metadata = derived_metadata;
251 if let Some(keys) = keys {
252 self.refund.payer_id = keys.public_key();
255 self.refund.payer.0 = metadata;
258 let mut bytes = Vec::new();
259 self.refund.write(&mut bytes).unwrap();
261 Ok(Refund { bytes, contents: self.refund })
266 impl<'a, T: secp256k1::Signing> RefundBuilder<'a, T> {
267 fn features_unchecked(mut self, features: InvoiceRequestFeatures) -> Self {
268 self.refund.features = features;
273 /// A `Refund` is a request to send an [`Invoice`] without a preceding [`Offer`].
275 /// Typically, after an invoice is paid, the recipient may publish a refund allowing the sender to
276 /// recoup their funds. A refund may be used more generally as an "offer for money", such as with a
279 /// [`Invoice`]: crate::offers::invoice::Invoice
280 /// [`Offer`]: crate::offers::offer::Offer
281 #[derive(Clone, Debug)]
282 #[cfg_attr(test, derive(PartialEq))]
284 pub(super) bytes: Vec<u8>,
285 pub(super) contents: RefundContents,
288 /// The contents of a [`Refund`], which may be shared with an [`Invoice`].
290 /// [`Invoice`]: crate::offers::invoice::Invoice
291 #[derive(Clone, Debug)]
292 #[cfg_attr(test, derive(PartialEq))]
293 pub(super) struct RefundContents {
294 payer: PayerContents,
297 absolute_expiry: Option<Duration>,
298 issuer: Option<String>,
299 paths: Option<Vec<BlindedPath>>,
300 // invoice_request fields
301 chain: Option<ChainHash>,
303 features: InvoiceRequestFeatures,
304 quantity: Option<u64>,
306 payer_note: Option<String>,
310 /// A complete description of the purpose of the refund. Intended to be displayed to the user
311 /// but with the caveat that it has not been verified in any way.
312 pub fn description(&self) -> PrintableString {
313 PrintableString(&self.contents.description)
316 /// Duration since the Unix epoch when an invoice should no longer be sent.
318 /// If `None`, the refund does not expire.
319 pub fn absolute_expiry(&self) -> Option<Duration> {
320 self.contents.absolute_expiry
323 /// Whether the refund has expired.
324 #[cfg(feature = "std")]
325 pub fn is_expired(&self) -> bool {
326 self.contents.is_expired()
329 /// The issuer of the refund, possibly beginning with `user@domain` or `domain`. Intended to be
330 /// displayed to the user but with the caveat that it has not been verified in any way.
331 pub fn issuer(&self) -> Option<PrintableString> {
332 self.contents.issuer.as_ref().map(|issuer| PrintableString(issuer.as_str()))
335 /// Paths to the sender originating from publicly reachable nodes. Blinded paths provide sender
336 /// privacy by obfuscating its node id.
337 pub fn paths(&self) -> &[BlindedPath] {
338 self.contents.paths.as_ref().map(|paths| paths.as_slice()).unwrap_or(&[])
341 /// An unpredictable series of bytes, typically containing information about the derivation of
344 /// [`payer_id`]: Self::payer_id
345 pub fn metadata(&self) -> &[u8] {
346 self.contents.metadata()
349 /// A chain that the refund is valid for.
350 pub fn chain(&self) -> ChainHash {
351 self.contents.chain.unwrap_or_else(|| self.contents.implied_chain())
354 /// The amount to refund in msats (i.e., the minimum lightning-payable unit for [`chain`]).
356 /// [`chain`]: Self::chain
357 pub fn amount_msats(&self) -> u64 {
358 self.contents.amount_msats
361 /// Features pertaining to requesting an invoice.
362 pub fn features(&self) -> &InvoiceRequestFeatures {
363 &self.contents.features
366 /// The quantity of an item that refund is for.
367 pub fn quantity(&self) -> Option<u64> {
368 self.contents.quantity
371 /// A public node id to send to in the case where there are no [`paths`]. Otherwise, a possibly
372 /// transient pubkey.
374 /// [`paths`]: Self::paths
375 pub fn payer_id(&self) -> PublicKey {
376 self.contents.payer_id
379 /// Payer provided note to include in the invoice.
380 pub fn payer_note(&self) -> Option<PrintableString> {
381 self.contents.payer_note.as_ref().map(|payer_note| PrintableString(payer_note.as_str()))
384 /// Creates an [`InvoiceBuilder`] for the refund with the given required fields and using the
385 /// [`Duration`] since [`std::time::SystemTime::UNIX_EPOCH`] as the creation time.
387 /// See [`Refund::respond_with_no_std`] for further details where the aforementioned creation
388 /// time is used for the `created_at` parameter.
390 /// [`Duration`]: core::time::Duration
391 #[cfg(feature = "std")]
393 &self, payment_paths: Vec<(BlindedPath, BlindedPayInfo)>, payment_hash: PaymentHash,
394 signing_pubkey: PublicKey,
395 ) -> Result<InvoiceBuilder, SemanticError> {
396 let created_at = std::time::SystemTime::now()
397 .duration_since(std::time::SystemTime::UNIX_EPOCH)
398 .expect("SystemTime::now() should come after SystemTime::UNIX_EPOCH");
400 self.respond_with_no_std(payment_paths, payment_hash, signing_pubkey, created_at)
403 /// Creates an [`InvoiceBuilder`] for the refund with the given required fields.
405 /// Unless [`InvoiceBuilder::relative_expiry`] is set, the invoice will expire two hours after
406 /// `created_at`, which is used to set [`Invoice::created_at`]. Useful for `no-std` builds where
407 /// [`std::time::SystemTime`] is not available.
409 /// The caller is expected to remember the preimage of `payment_hash` in order to
410 /// claim a payment for the invoice.
412 /// The `signing_pubkey` is required to sign the invoice since refunds are not in response to an
413 /// offer, which does have a `signing_pubkey`.
415 /// The `payment_paths` parameter is useful for maintaining the payment recipient's privacy. It
416 /// must contain one or more elements ordered from most-preferred to least-preferred, if there's
417 /// a preference. Note, however, that any privacy is lost if a public node id is used for
418 /// `signing_pubkey`.
420 /// Errors if the request contains unknown required features.
422 /// [`Invoice::created_at`]: crate::offers::invoice::Invoice::created_at
423 pub fn respond_with_no_std(
424 &self, payment_paths: Vec<(BlindedPath, BlindedPayInfo)>, payment_hash: PaymentHash,
425 signing_pubkey: PublicKey, created_at: Duration
426 ) -> Result<InvoiceBuilder, SemanticError> {
427 if self.features().requires_unknown_bits() {
428 return Err(SemanticError::UnknownRequiredFeatures);
431 InvoiceBuilder::for_refund(self, payment_paths, created_at, payment_hash, signing_pubkey)
435 fn as_tlv_stream(&self) -> RefundTlvStreamRef {
436 self.contents.as_tlv_stream()
440 impl AsRef<[u8]> for Refund {
441 fn as_ref(&self) -> &[u8] {
446 impl RefundContents {
447 #[cfg(feature = "std")]
448 pub(super) fn is_expired(&self) -> bool {
449 match self.absolute_expiry {
450 Some(seconds_from_epoch) => match SystemTime::UNIX_EPOCH.elapsed() {
451 Ok(elapsed) => elapsed > seconds_from_epoch,
458 pub(super) fn metadata(&self) -> &[u8] {
459 self.payer.0.as_bytes().map(|bytes| bytes.as_slice()).unwrap_or(&[])
462 pub(super) fn chain(&self) -> ChainHash {
463 self.chain.unwrap_or_else(|| self.implied_chain())
466 pub fn implied_chain(&self) -> ChainHash {
467 ChainHash::using_genesis_block(Network::Bitcoin)
470 pub(super) fn derives_keys(&self) -> bool {
471 self.payer.0.derives_keys()
474 pub(super) fn payer_id(&self) -> PublicKey {
478 pub(super) fn as_tlv_stream(&self) -> RefundTlvStreamRef {
479 let payer = PayerTlvStreamRef {
480 metadata: self.payer.0.as_bytes(),
483 let offer = OfferTlvStreamRef {
488 description: Some(&self.description),
490 absolute_expiry: self.absolute_expiry.map(|duration| duration.as_secs()),
491 paths: self.paths.as_ref(),
492 issuer: self.issuer.as_ref(),
498 if self.features == InvoiceRequestFeatures::empty() { None }
499 else { Some(&self.features) }
502 let invoice_request = InvoiceRequestTlvStreamRef {
503 chain: self.chain.as_ref(),
504 amount: Some(self.amount_msats),
506 quantity: self.quantity,
507 payer_id: Some(&self.payer_id),
508 payer_note: self.payer_note.as_ref(),
511 (payer, offer, invoice_request)
515 impl Writeable for Refund {
516 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
517 WithoutLength(&self.bytes).write(writer)
521 impl Writeable for RefundContents {
522 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
523 self.as_tlv_stream().write(writer)
527 type RefundTlvStream = (PayerTlvStream, OfferTlvStream, InvoiceRequestTlvStream);
529 type RefundTlvStreamRef<'a> = (
530 PayerTlvStreamRef<'a>,
531 OfferTlvStreamRef<'a>,
532 InvoiceRequestTlvStreamRef<'a>,
535 impl SeekReadable for RefundTlvStream {
536 fn read<R: io::Read + io::Seek>(r: &mut R) -> Result<Self, DecodeError> {
537 let payer = SeekReadable::read(r)?;
538 let offer = SeekReadable::read(r)?;
539 let invoice_request = SeekReadable::read(r)?;
541 Ok((payer, offer, invoice_request))
545 impl Bech32Encode for Refund {
546 const BECH32_HRP: &'static str = "lnr";
549 impl FromStr for Refund {
550 type Err = ParseError;
552 fn from_str(s: &str) -> Result<Self, <Self as FromStr>::Err> {
553 Refund::from_bech32_str(s)
557 impl TryFrom<Vec<u8>> for Refund {
558 type Error = ParseError;
560 fn try_from(bytes: Vec<u8>) -> Result<Self, Self::Error> {
561 let refund = ParsedMessage::<RefundTlvStream>::try_from(bytes)?;
562 let ParsedMessage { bytes, tlv_stream } = refund;
563 let contents = RefundContents::try_from(tlv_stream)?;
565 Ok(Refund { bytes, contents })
569 impl TryFrom<RefundTlvStream> for RefundContents {
570 type Error = SemanticError;
572 fn try_from(tlv_stream: RefundTlvStream) -> Result<Self, Self::Error> {
574 PayerTlvStream { metadata: payer_metadata },
576 chains, metadata, currency, amount: offer_amount, description,
577 features: offer_features, absolute_expiry, paths, issuer, quantity_max, node_id,
579 InvoiceRequestTlvStream { chain, amount, features, quantity, payer_id, payer_note },
582 let payer = match payer_metadata {
583 None => return Err(SemanticError::MissingPayerMetadata),
584 Some(metadata) => PayerContents(Metadata::Bytes(metadata)),
587 if metadata.is_some() {
588 return Err(SemanticError::UnexpectedMetadata);
591 if chains.is_some() {
592 return Err(SemanticError::UnexpectedChain);
595 if currency.is_some() || offer_amount.is_some() {
596 return Err(SemanticError::UnexpectedAmount);
599 let description = match description {
600 None => return Err(SemanticError::MissingDescription),
601 Some(description) => description,
604 if offer_features.is_some() {
605 return Err(SemanticError::UnexpectedFeatures);
608 let absolute_expiry = absolute_expiry.map(Duration::from_secs);
610 if quantity_max.is_some() {
611 return Err(SemanticError::UnexpectedQuantity);
614 if node_id.is_some() {
615 return Err(SemanticError::UnexpectedSigningPubkey);
618 let amount_msats = match amount {
619 None => return Err(SemanticError::MissingAmount),
620 Some(amount_msats) if amount_msats > MAX_VALUE_MSAT => {
621 return Err(SemanticError::InvalidAmount);
623 Some(amount_msats) => amount_msats,
626 let features = features.unwrap_or_else(InvoiceRequestFeatures::empty);
628 let payer_id = match payer_id {
629 None => return Err(SemanticError::MissingPayerId),
630 Some(payer_id) => payer_id,
634 payer, description, absolute_expiry, issuer, paths, chain, amount_msats, features,
635 quantity, payer_id, payer_note,
640 impl core::fmt::Display for Refund {
641 fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
642 self.fmt_bech32_str(f)
648 use super::{Refund, RefundBuilder, RefundTlvStreamRef};
650 use bitcoin::blockdata::constants::ChainHash;
651 use bitcoin::network::constants::Network;
652 use bitcoin::secp256k1::{KeyPair, Secp256k1, SecretKey};
653 use core::convert::TryFrom;
654 use core::time::Duration;
655 use crate::chain::keysinterface::KeyMaterial;
656 use crate::ln::features::{InvoiceRequestFeatures, OfferFeatures};
657 use crate::ln::inbound_payment::ExpandedKey;
658 use crate::ln::msgs::{DecodeError, MAX_VALUE_MSAT};
659 use crate::offers::invoice_request::InvoiceRequestTlvStreamRef;
660 use crate::offers::offer::OfferTlvStreamRef;
661 use crate::offers::parse::{ParseError, SemanticError};
662 use crate::offers::payer::PayerTlvStreamRef;
663 use crate::offers::test_utils::*;
664 use crate::onion_message::{BlindedHop, BlindedPath};
665 use crate::util::ser::{BigSize, Writeable};
666 use crate::util::string::PrintableString;
669 fn to_bytes(&self) -> Vec<u8>;
672 impl<'a> ToBytes for RefundTlvStreamRef<'a> {
673 fn to_bytes(&self) -> Vec<u8> {
674 let mut buffer = Vec::new();
675 self.write(&mut buffer).unwrap();
681 fn builds_refund_with_defaults() {
682 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
685 let mut buffer = Vec::new();
686 refund.write(&mut buffer).unwrap();
688 assert_eq!(refund.bytes, buffer.as_slice());
689 assert_eq!(refund.metadata(), &[1; 32]);
690 assert_eq!(refund.description(), PrintableString("foo"));
691 assert_eq!(refund.absolute_expiry(), None);
692 #[cfg(feature = "std")]
693 assert!(!refund.is_expired());
694 assert_eq!(refund.paths(), &[]);
695 assert_eq!(refund.issuer(), None);
696 assert_eq!(refund.chain(), ChainHash::using_genesis_block(Network::Bitcoin));
697 assert_eq!(refund.amount_msats(), 1000);
698 assert_eq!(refund.features(), &InvoiceRequestFeatures::empty());
699 assert_eq!(refund.payer_id(), payer_pubkey());
700 assert_eq!(refund.payer_note(), None);
703 refund.as_tlv_stream(),
705 PayerTlvStreamRef { metadata: Some(&vec![1; 32]) },
711 description: Some(&String::from("foo")),
713 absolute_expiry: None,
719 InvoiceRequestTlvStreamRef {
724 payer_id: Some(&payer_pubkey()),
730 if let Err(e) = Refund::try_from(buffer) {
731 panic!("error parsing refund: {:?}", e);
736 fn fails_building_refund_with_invalid_amount() {
737 match RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), MAX_VALUE_MSAT + 1) {
738 Ok(_) => panic!("expected error"),
739 Err(e) => assert_eq!(e, SemanticError::InvalidAmount),
744 fn builds_refund_with_metadata_derived() {
745 let desc = "foo".to_string();
746 let node_id = payer_pubkey();
747 let expanded_key = ExpandedKey::new(&KeyMaterial([42; 32]));
748 let entropy = FixedEntropy {};
749 let secp_ctx = Secp256k1::new();
751 let refund = RefundBuilder
752 ::deriving_payer_id(desc, node_id, &expanded_key, &entropy, &secp_ctx, 1000)
755 assert_eq!(refund.payer_id(), node_id);
757 // Fails verification with altered fields
759 .respond_with_no_std(payment_paths(), payment_hash(), recipient_pubkey(), now())
762 .sign(recipient_sign).unwrap();
763 assert!(invoice.verify(&expanded_key, &secp_ctx));
765 let mut tlv_stream = refund.as_tlv_stream();
766 tlv_stream.2.amount = Some(2000);
768 let mut encoded_refund = Vec::new();
769 tlv_stream.write(&mut encoded_refund).unwrap();
771 let invoice = Refund::try_from(encoded_refund).unwrap()
772 .respond_with_no_std(payment_paths(), payment_hash(), recipient_pubkey(), now())
775 .sign(recipient_sign).unwrap();
776 assert!(!invoice.verify(&expanded_key, &secp_ctx));
778 // Fails verification with altered metadata
779 let mut tlv_stream = refund.as_tlv_stream();
780 let metadata = tlv_stream.0.metadata.unwrap().iter().copied().rev().collect();
781 tlv_stream.0.metadata = Some(&metadata);
783 let mut encoded_refund = Vec::new();
784 tlv_stream.write(&mut encoded_refund).unwrap();
786 let invoice = Refund::try_from(encoded_refund).unwrap()
787 .respond_with_no_std(payment_paths(), payment_hash(), recipient_pubkey(), now())
790 .sign(recipient_sign).unwrap();
791 assert!(!invoice.verify(&expanded_key, &secp_ctx));
795 fn builds_refund_with_derived_payer_id() {
796 let desc = "foo".to_string();
797 let node_id = payer_pubkey();
798 let expanded_key = ExpandedKey::new(&KeyMaterial([42; 32]));
799 let entropy = FixedEntropy {};
800 let secp_ctx = Secp256k1::new();
802 let blinded_path = BlindedPath {
803 introduction_node_id: pubkey(40),
804 blinding_point: pubkey(41),
806 BlindedHop { blinded_node_id: pubkey(43), encrypted_payload: vec![0; 43] },
807 BlindedHop { blinded_node_id: node_id, encrypted_payload: vec![0; 44] },
811 let refund = RefundBuilder
812 ::deriving_payer_id(desc, node_id, &expanded_key, &entropy, &secp_ctx, 1000)
816 assert_ne!(refund.payer_id(), node_id);
819 .respond_with_no_std(payment_paths(), payment_hash(), recipient_pubkey(), now())
822 .sign(recipient_sign).unwrap();
823 assert!(invoice.verify(&expanded_key, &secp_ctx));
825 // Fails verification with altered fields
826 let mut tlv_stream = refund.as_tlv_stream();
827 tlv_stream.2.amount = Some(2000);
829 let mut encoded_refund = Vec::new();
830 tlv_stream.write(&mut encoded_refund).unwrap();
832 let invoice = Refund::try_from(encoded_refund).unwrap()
833 .respond_with_no_std(payment_paths(), payment_hash(), recipient_pubkey(), now())
836 .sign(recipient_sign).unwrap();
837 assert!(!invoice.verify(&expanded_key, &secp_ctx));
839 // Fails verification with altered payer_id
840 let mut tlv_stream = refund.as_tlv_stream();
841 let payer_id = pubkey(1);
842 tlv_stream.2.payer_id = Some(&payer_id);
844 let mut encoded_refund = Vec::new();
845 tlv_stream.write(&mut encoded_refund).unwrap();
847 let invoice = Refund::try_from(encoded_refund).unwrap()
848 .respond_with_no_std(payment_paths(), payment_hash(), recipient_pubkey(), now())
851 .sign(recipient_sign).unwrap();
852 assert!(!invoice.verify(&expanded_key, &secp_ctx));
856 fn builds_refund_with_absolute_expiry() {
857 let future_expiry = Duration::from_secs(u64::max_value());
858 let past_expiry = Duration::from_secs(0);
860 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
861 .absolute_expiry(future_expiry)
864 let (_, tlv_stream, _) = refund.as_tlv_stream();
865 #[cfg(feature = "std")]
866 assert!(!refund.is_expired());
867 assert_eq!(refund.absolute_expiry(), Some(future_expiry));
868 assert_eq!(tlv_stream.absolute_expiry, Some(future_expiry.as_secs()));
870 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
871 .absolute_expiry(future_expiry)
872 .absolute_expiry(past_expiry)
875 let (_, tlv_stream, _) = refund.as_tlv_stream();
876 #[cfg(feature = "std")]
877 assert!(refund.is_expired());
878 assert_eq!(refund.absolute_expiry(), Some(past_expiry));
879 assert_eq!(tlv_stream.absolute_expiry, Some(past_expiry.as_secs()));
883 fn builds_refund_with_paths() {
886 introduction_node_id: pubkey(40),
887 blinding_point: pubkey(41),
889 BlindedHop { blinded_node_id: pubkey(43), encrypted_payload: vec![0; 43] },
890 BlindedHop { blinded_node_id: pubkey(44), encrypted_payload: vec![0; 44] },
894 introduction_node_id: pubkey(40),
895 blinding_point: pubkey(41),
897 BlindedHop { blinded_node_id: pubkey(45), encrypted_payload: vec![0; 45] },
898 BlindedHop { blinded_node_id: pubkey(46), encrypted_payload: vec![0; 46] },
903 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
904 .path(paths[0].clone())
905 .path(paths[1].clone())
908 let (_, offer_tlv_stream, invoice_request_tlv_stream) = refund.as_tlv_stream();
909 assert_eq!(refund.paths(), paths.as_slice());
910 assert_eq!(refund.payer_id(), pubkey(42));
911 assert_ne!(pubkey(42), pubkey(44));
912 assert_eq!(offer_tlv_stream.paths, Some(&paths));
913 assert_eq!(invoice_request_tlv_stream.payer_id, Some(&pubkey(42)));
917 fn builds_refund_with_issuer() {
918 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
919 .issuer("bar".into())
922 let (_, tlv_stream, _) = refund.as_tlv_stream();
923 assert_eq!(refund.issuer(), Some(PrintableString("bar")));
924 assert_eq!(tlv_stream.issuer, Some(&String::from("bar")));
926 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
927 .issuer("bar".into())
928 .issuer("baz".into())
931 let (_, tlv_stream, _) = refund.as_tlv_stream();
932 assert_eq!(refund.issuer(), Some(PrintableString("baz")));
933 assert_eq!(tlv_stream.issuer, Some(&String::from("baz")));
937 fn builds_refund_with_chain() {
938 let mainnet = ChainHash::using_genesis_block(Network::Bitcoin);
939 let testnet = ChainHash::using_genesis_block(Network::Testnet);
941 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
942 .chain(Network::Bitcoin)
944 let (_, _, tlv_stream) = refund.as_tlv_stream();
945 assert_eq!(refund.chain(), mainnet);
946 assert_eq!(tlv_stream.chain, None);
948 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
949 .chain(Network::Testnet)
951 let (_, _, tlv_stream) = refund.as_tlv_stream();
952 assert_eq!(refund.chain(), testnet);
953 assert_eq!(tlv_stream.chain, Some(&testnet));
955 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
956 .chain(Network::Regtest)
957 .chain(Network::Testnet)
959 let (_, _, tlv_stream) = refund.as_tlv_stream();
960 assert_eq!(refund.chain(), testnet);
961 assert_eq!(tlv_stream.chain, Some(&testnet));
965 fn builds_refund_with_quantity() {
966 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
969 let (_, _, tlv_stream) = refund.as_tlv_stream();
970 assert_eq!(refund.quantity(), Some(10));
971 assert_eq!(tlv_stream.quantity, Some(10));
973 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
977 let (_, _, tlv_stream) = refund.as_tlv_stream();
978 assert_eq!(refund.quantity(), Some(1));
979 assert_eq!(tlv_stream.quantity, Some(1));
983 fn builds_refund_with_payer_note() {
984 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
985 .payer_note("bar".into())
987 let (_, _, tlv_stream) = refund.as_tlv_stream();
988 assert_eq!(refund.payer_note(), Some(PrintableString("bar")));
989 assert_eq!(tlv_stream.payer_note, Some(&String::from("bar")));
991 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
992 .payer_note("bar".into())
993 .payer_note("baz".into())
995 let (_, _, tlv_stream) = refund.as_tlv_stream();
996 assert_eq!(refund.payer_note(), Some(PrintableString("baz")));
997 assert_eq!(tlv_stream.payer_note, Some(&String::from("baz")));
1001 fn fails_responding_with_unknown_required_features() {
1002 match RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1003 .features_unchecked(InvoiceRequestFeatures::unknown())
1005 .respond_with_no_std(payment_paths(), payment_hash(), recipient_pubkey(), now())
1007 Ok(_) => panic!("expected error"),
1008 Err(e) => assert_eq!(e, SemanticError::UnknownRequiredFeatures),
1013 fn parses_refund_with_metadata() {
1014 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1016 if let Err(e) = refund.to_string().parse::<Refund>() {
1017 panic!("error parsing refund: {:?}", e);
1020 let mut tlv_stream = refund.as_tlv_stream();
1021 tlv_stream.0.metadata = None;
1023 match Refund::try_from(tlv_stream.to_bytes()) {
1024 Ok(_) => panic!("expected error"),
1026 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingPayerMetadata));
1032 fn parses_refund_with_description() {
1033 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1035 if let Err(e) = refund.to_string().parse::<Refund>() {
1036 panic!("error parsing refund: {:?}", e);
1039 let mut tlv_stream = refund.as_tlv_stream();
1040 tlv_stream.1.description = None;
1042 match Refund::try_from(tlv_stream.to_bytes()) {
1043 Ok(_) => panic!("expected error"),
1045 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingDescription));
1051 fn parses_refund_with_amount() {
1052 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1054 if let Err(e) = refund.to_string().parse::<Refund>() {
1055 panic!("error parsing refund: {:?}", e);
1058 let mut tlv_stream = refund.as_tlv_stream();
1059 tlv_stream.2.amount = None;
1061 match Refund::try_from(tlv_stream.to_bytes()) {
1062 Ok(_) => panic!("expected error"),
1064 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingAmount));
1068 let mut tlv_stream = refund.as_tlv_stream();
1069 tlv_stream.2.amount = Some(MAX_VALUE_MSAT + 1);
1071 match Refund::try_from(tlv_stream.to_bytes()) {
1072 Ok(_) => panic!("expected error"),
1074 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::InvalidAmount));
1080 fn parses_refund_with_payer_id() {
1081 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1083 if let Err(e) = refund.to_string().parse::<Refund>() {
1084 panic!("error parsing refund: {:?}", e);
1087 let mut tlv_stream = refund.as_tlv_stream();
1088 tlv_stream.2.payer_id = None;
1090 match Refund::try_from(tlv_stream.to_bytes()) {
1091 Ok(_) => panic!("expected error"),
1093 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingPayerId));
1099 fn parses_refund_with_optional_fields() {
1100 let past_expiry = Duration::from_secs(0);
1103 introduction_node_id: pubkey(40),
1104 blinding_point: pubkey(41),
1106 BlindedHop { blinded_node_id: pubkey(43), encrypted_payload: vec![0; 43] },
1107 BlindedHop { blinded_node_id: pubkey(44), encrypted_payload: vec![0; 44] },
1111 introduction_node_id: pubkey(40),
1112 blinding_point: pubkey(41),
1114 BlindedHop { blinded_node_id: pubkey(45), encrypted_payload: vec![0; 45] },
1115 BlindedHop { blinded_node_id: pubkey(46), encrypted_payload: vec![0; 46] },
1120 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1121 .absolute_expiry(past_expiry)
1122 .issuer("bar".into())
1123 .path(paths[0].clone())
1124 .path(paths[1].clone())
1125 .chain(Network::Testnet)
1126 .features_unchecked(InvoiceRequestFeatures::unknown())
1128 .payer_note("baz".into())
1131 match refund.to_string().parse::<Refund>() {
1133 assert_eq!(refund.absolute_expiry(), Some(past_expiry));
1134 #[cfg(feature = "std")]
1135 assert!(refund.is_expired());
1136 assert_eq!(refund.paths(), &paths[..]);
1137 assert_eq!(refund.issuer(), Some(PrintableString("bar")));
1138 assert_eq!(refund.chain(), ChainHash::using_genesis_block(Network::Testnet));
1139 assert_eq!(refund.features(), &InvoiceRequestFeatures::unknown());
1140 assert_eq!(refund.quantity(), Some(10));
1141 assert_eq!(refund.payer_note(), Some(PrintableString("baz")));
1143 Err(e) => panic!("error parsing refund: {:?}", e),
1148 fn fails_parsing_refund_with_unexpected_fields() {
1149 let refund = RefundBuilder::new("foo".into(), vec![1; 32], payer_pubkey(), 1000).unwrap()
1151 if let Err(e) = refund.to_string().parse::<Refund>() {
1152 panic!("error parsing refund: {:?}", e);
1155 let metadata = vec![42; 32];
1156 let mut tlv_stream = refund.as_tlv_stream();
1157 tlv_stream.1.metadata = Some(&metadata);
1159 match Refund::try_from(tlv_stream.to_bytes()) {
1160 Ok(_) => panic!("expected error"),
1162 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::UnexpectedMetadata));
1166 let chains = vec![ChainHash::using_genesis_block(Network::Testnet)];
1167 let mut tlv_stream = refund.as_tlv_stream();
1168 tlv_stream.1.chains = Some(&chains);
1170 match Refund::try_from(tlv_stream.to_bytes()) {
1171 Ok(_) => panic!("expected error"),
1173 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::UnexpectedChain));
1177 let mut tlv_stream = refund.as_tlv_stream();
1178 tlv_stream.1.currency = Some(&b"USD");
1179 tlv_stream.1.amount = Some(1000);
1181 match Refund::try_from(tlv_stream.to_bytes()) {
1182 Ok(_) => panic!("expected error"),
1184 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::UnexpectedAmount));
1188 let features = OfferFeatures::unknown();
1189 let mut tlv_stream = refund.as_tlv_stream();
1190 tlv_stream.1.features = Some(&features);
1192 match Refund::try_from(tlv_stream.to_bytes()) {
1193 Ok(_) => panic!("expected error"),
1195 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::UnexpectedFeatures));
1199 let mut tlv_stream = refund.as_tlv_stream();
1200 tlv_stream.1.quantity_max = Some(10);
1202 match Refund::try_from(tlv_stream.to_bytes()) {
1203 Ok(_) => panic!("expected error"),
1205 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::UnexpectedQuantity));
1209 let node_id = payer_pubkey();
1210 let mut tlv_stream = refund.as_tlv_stream();
1211 tlv_stream.1.node_id = Some(&node_id);
1213 match Refund::try_from(tlv_stream.to_bytes()) {
1214 Ok(_) => panic!("expected error"),
1216 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::UnexpectedSigningPubkey));
1222 fn fails_parsing_refund_with_extra_tlv_records() {
1223 let secp_ctx = Secp256k1::new();
1224 let keys = KeyPair::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
1225 let refund = RefundBuilder::new("foo".into(), vec![1; 32], keys.public_key(), 1000).unwrap()
1228 let mut encoded_refund = Vec::new();
1229 refund.write(&mut encoded_refund).unwrap();
1230 BigSize(1002).write(&mut encoded_refund).unwrap();
1231 BigSize(32).write(&mut encoded_refund).unwrap();
1232 [42u8; 32].write(&mut encoded_refund).unwrap();
1234 match Refund::try_from(encoded_refund) {
1235 Ok(_) => panic!("expected error"),
1236 Err(e) => assert_eq!(e, ParseError::Decode(DecodeError::InvalidValue)),