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 `invoice_request` messages.
12 //! An [`InvoiceRequest`] can be built from a parsed [`Offer`] as an "offer to be paid". It is
13 //! typically constructed by a customer and sent to the merchant who had published the corresponding
14 //! offer. The recipient of the request responds with an [`Invoice`].
16 //! For an "offer for money" (e.g., refund, ATM withdrawal), where an offer doesn't exist as a
17 //! precursor, see [`Refund`].
19 //! [`Invoice`]: crate::offers::invoice::Invoice
20 //! [`Refund`]: crate::offers::refund::Refund
23 //! extern crate bitcoin;
24 //! extern crate lightning;
26 //! use bitcoin::network::constants::Network;
27 //! use bitcoin::secp256k1::{KeyPair, PublicKey, Secp256k1, SecretKey};
28 //! use core::convert::Infallible;
29 //! use lightning::ln::features::OfferFeatures;
30 //! use lightning::offers::offer::Offer;
31 //! use lightning::util::ser::Writeable;
33 //! # fn parse() -> Result<(), lightning::offers::parse::ParseError> {
34 //! let secp_ctx = Secp256k1::new();
35 //! let keys = KeyPair::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32])?);
36 //! let pubkey = PublicKey::from(keys);
37 //! let mut buffer = Vec::new();
40 //! .parse::<Offer>()?
41 //! .request_invoice(vec![42; 64], pubkey)?
42 //! .chain(Network::Testnet)?
43 //! .amount_msats(1000)?
45 //! .payer_note("foo".to_string())
47 //! .sign::<_, Infallible>(|digest| Ok(secp_ctx.sign_schnorr_no_aux_rand(digest, &keys)))
48 //! .expect("failed verifying signature")
49 //! .write(&mut buffer)
55 use bitcoin::blockdata::constants::ChainHash;
56 use bitcoin::network::constants::Network;
57 use bitcoin::secp256k1::{Message, PublicKey};
58 use bitcoin::secp256k1::schnorr::Signature;
59 use core::convert::TryFrom;
61 use crate::ln::PaymentHash;
62 use crate::ln::features::InvoiceRequestFeatures;
63 use crate::ln::msgs::DecodeError;
64 use crate::offers::invoice::{BlindedPayInfo, InvoiceBuilder};
65 use crate::offers::merkle::{SignError, SignatureTlvStream, SignatureTlvStreamRef, self};
66 use crate::offers::offer::{Offer, OfferContents, OfferTlvStream, OfferTlvStreamRef};
67 use crate::offers::parse::{ParseError, ParsedMessage, SemanticError};
68 use crate::offers::payer::{PayerContents, PayerTlvStream, PayerTlvStreamRef};
69 use crate::onion_message::BlindedPath;
70 use crate::util::ser::{HighZeroBytesDroppedBigSize, SeekReadable, WithoutLength, Writeable, Writer};
71 use crate::util::string::PrintableString;
73 use crate::prelude::*;
75 const SIGNATURE_TAG: &'static str = concat!("lightning", "invoice_request", "signature");
77 /// Builds an [`InvoiceRequest`] from an [`Offer`] for the "offer to be paid" flow.
79 /// See [module-level documentation] for usage.
81 /// [module-level documentation]: self
82 pub struct InvoiceRequestBuilder<'a> {
84 invoice_request: InvoiceRequestContents,
87 impl<'a> InvoiceRequestBuilder<'a> {
88 pub(super) fn new(offer: &'a Offer, metadata: Vec<u8>, payer_id: PublicKey) -> Self {
91 invoice_request: InvoiceRequestContents {
92 payer: PayerContents(metadata), offer: offer.contents.clone(), chain: None,
93 amount_msats: None, features: InvoiceRequestFeatures::empty(), quantity: None,
94 payer_id, payer_note: None,
99 /// Sets the [`InvoiceRequest::chain`] of the given [`Network`] for paying an invoice. If not
100 /// called, [`Network::Bitcoin`] is assumed. Errors if the chain for `network` is not supported
103 /// Successive calls to this method will override the previous setting.
104 pub fn chain(mut self, network: Network) -> Result<Self, SemanticError> {
105 let chain = ChainHash::using_genesis_block(network);
106 if !self.offer.supports_chain(chain) {
107 return Err(SemanticError::UnsupportedChain);
110 self.invoice_request.chain = Some(chain);
114 /// Sets the [`InvoiceRequest::amount_msats`] for paying an invoice. Errors if `amount_msats` is
115 /// not at least the expected invoice amount (i.e., [`Offer::amount`] times [`quantity`]).
117 /// Successive calls to this method will override the previous setting.
119 /// [`quantity`]: Self::quantity
120 pub fn amount_msats(mut self, amount_msats: u64) -> Result<Self, SemanticError> {
121 self.invoice_request.offer.check_amount_msats_for_quantity(
122 Some(amount_msats), self.invoice_request.quantity
124 self.invoice_request.amount_msats = Some(amount_msats);
128 /// Sets [`InvoiceRequest::quantity`] of items. If not set, `1` is assumed. Errors if `quantity`
129 /// does not conform to [`Offer::is_valid_quantity`].
131 /// Successive calls to this method will override the previous setting.
132 pub fn quantity(mut self, quantity: u64) -> Result<Self, SemanticError> {
133 self.invoice_request.offer.check_quantity(Some(quantity))?;
134 self.invoice_request.quantity = Some(quantity);
138 /// Sets the [`InvoiceRequest::payer_note`].
140 /// Successive calls to this method will override the previous setting.
141 pub fn payer_note(mut self, payer_note: String) -> Self {
142 self.invoice_request.payer_note = Some(payer_note);
146 /// Builds an unsigned [`InvoiceRequest`] after checking for valid semantics. It can be signed
147 /// by [`UnsignedInvoiceRequest::sign`].
148 pub fn build(mut self) -> Result<UnsignedInvoiceRequest<'a>, SemanticError> {
149 #[cfg(feature = "std")] {
150 if self.offer.is_expired() {
151 return Err(SemanticError::AlreadyExpired);
155 let chain = self.invoice_request.chain();
156 if !self.offer.supports_chain(chain) {
157 return Err(SemanticError::UnsupportedChain);
160 if chain == self.offer.implied_chain() {
161 self.invoice_request.chain = None;
164 if self.offer.amount().is_none() && self.invoice_request.amount_msats.is_none() {
165 return Err(SemanticError::MissingAmount);
168 self.invoice_request.offer.check_quantity(self.invoice_request.quantity)?;
169 self.invoice_request.offer.check_amount_msats_for_quantity(
170 self.invoice_request.amount_msats, self.invoice_request.quantity
173 let InvoiceRequestBuilder { offer, invoice_request } = self;
174 Ok(UnsignedInvoiceRequest { offer, invoice_request })
179 impl<'a> InvoiceRequestBuilder<'a> {
180 fn chain_unchecked(mut self, network: Network) -> Self {
181 let chain = ChainHash::using_genesis_block(network);
182 self.invoice_request.chain = Some(chain);
186 fn amount_msats_unchecked(mut self, amount_msats: u64) -> Self {
187 self.invoice_request.amount_msats = Some(amount_msats);
191 fn features_unchecked(mut self, features: InvoiceRequestFeatures) -> Self {
192 self.invoice_request.features = features;
196 fn quantity_unchecked(mut self, quantity: u64) -> Self {
197 self.invoice_request.quantity = Some(quantity);
201 pub(super) fn build_unchecked(self) -> UnsignedInvoiceRequest<'a> {
202 let InvoiceRequestBuilder { offer, invoice_request } = self;
203 UnsignedInvoiceRequest { offer, invoice_request }
207 /// A semantically valid [`InvoiceRequest`] that hasn't been signed.
208 pub struct UnsignedInvoiceRequest<'a> {
210 invoice_request: InvoiceRequestContents,
213 impl<'a> UnsignedInvoiceRequest<'a> {
214 /// Signs the invoice request using the given function.
215 pub fn sign<F, E>(self, sign: F) -> Result<InvoiceRequest, SignError<E>>
217 F: FnOnce(&Message) -> Result<Signature, E>
219 // Use the offer bytes instead of the offer TLV stream as the offer may have contained
220 // unknown TLV records, which are not stored in `OfferContents`.
221 let (payer_tlv_stream, _offer_tlv_stream, invoice_request_tlv_stream) =
222 self.invoice_request.as_tlv_stream();
223 let offer_bytes = WithoutLength(&self.offer.bytes);
224 let unsigned_tlv_stream = (payer_tlv_stream, offer_bytes, invoice_request_tlv_stream);
226 let mut bytes = Vec::new();
227 unsigned_tlv_stream.write(&mut bytes).unwrap();
229 let pubkey = self.invoice_request.payer_id;
230 let signature = merkle::sign_message(sign, SIGNATURE_TAG, &bytes, pubkey)?;
232 // Append the signature TLV record to the bytes.
233 let signature_tlv_stream = SignatureTlvStreamRef {
234 signature: Some(&signature),
236 signature_tlv_stream.write(&mut bytes).unwrap();
240 contents: self.invoice_request,
246 /// An `InvoiceRequest` is a request for an [`Invoice`] formulated from an [`Offer`].
248 /// An offer may provide choices such as quantity, amount, chain, features, etc. An invoice request
249 /// specifies these such that its recipient can send an invoice for payment.
251 /// [`Invoice`]: crate::offers::invoice::Invoice
252 /// [`Offer`]: crate::offers::offer::Offer
253 #[derive(Clone, Debug, PartialEq)]
254 pub struct InvoiceRequest {
255 pub(super) bytes: Vec<u8>,
256 pub(super) contents: InvoiceRequestContents,
257 signature: Signature,
260 /// The contents of an [`InvoiceRequest`], which may be shared with an [`Invoice`].
262 /// [`Invoice`]: crate::offers::invoice::Invoice
263 #[derive(Clone, Debug, PartialEq)]
264 pub(super) struct InvoiceRequestContents {
265 payer: PayerContents,
266 pub(super) offer: OfferContents,
267 chain: Option<ChainHash>,
268 amount_msats: Option<u64>,
269 features: InvoiceRequestFeatures,
270 quantity: Option<u64>,
272 payer_note: Option<String>,
275 impl InvoiceRequest {
276 /// An unpredictable series of bytes, typically containing information about the derivation of
279 /// [`payer_id`]: Self::payer_id
280 pub fn metadata(&self) -> &[u8] {
281 &self.contents.payer.0[..]
284 /// A chain from [`Offer::chains`] that the offer is valid for.
285 pub fn chain(&self) -> ChainHash {
286 self.contents.chain()
289 /// The amount to pay in msats (i.e., the minimum lightning-payable unit for [`chain`]), which
290 /// must be greater than or equal to [`Offer::amount`], converted if necessary.
292 /// [`chain`]: Self::chain
293 pub fn amount_msats(&self) -> Option<u64> {
294 self.contents.amount_msats
297 /// Features pertaining to requesting an invoice.
298 pub fn features(&self) -> &InvoiceRequestFeatures {
299 &self.contents.features
302 /// The quantity of the offer's item conforming to [`Offer::is_valid_quantity`].
303 pub fn quantity(&self) -> Option<u64> {
304 self.contents.quantity
307 /// A possibly transient pubkey used to sign the invoice request.
308 pub fn payer_id(&self) -> PublicKey {
309 self.contents.payer_id
312 /// A payer-provided note which will be seen by the recipient and reflected back in the invoice
314 pub fn payer_note(&self) -> Option<PrintableString> {
315 self.contents.payer_note.as_ref().map(|payer_note| PrintableString(payer_note.as_str()))
318 /// Signature of the invoice request using [`payer_id`].
320 /// [`payer_id`]: Self::payer_id
321 pub fn signature(&self) -> Signature {
325 /// Creates an [`Invoice`] for the request with the given required fields and using the
326 /// [`Duration`] since [`std::time::SystemTime::UNIX_EPOCH`] as the creation time.
328 /// See [`InvoiceRequest::respond_with_no_std`] for further details where the aforementioned
329 /// creation time is used for the `created_at` parameter.
331 /// [`Invoice`]: crate::offers::invoice::Invoice
332 /// [`Duration`]: core::time::Duration
333 #[cfg(feature = "std")]
335 &self, payment_paths: Vec<(BlindedPath, BlindedPayInfo)>, payment_hash: PaymentHash
336 ) -> Result<InvoiceBuilder, SemanticError> {
337 let created_at = std::time::SystemTime::now()
338 .duration_since(std::time::SystemTime::UNIX_EPOCH)
339 .expect("SystemTime::now() should come after SystemTime::UNIX_EPOCH");
341 self.respond_with_no_std(payment_paths, payment_hash, created_at)
344 /// Creates an [`Invoice`] for the request with the given required fields.
346 /// Unless [`InvoiceBuilder::relative_expiry`] is set, the invoice will expire two hours after
347 /// `created_at`, which is used to set [`Invoice::created_at`]. Useful for `no-std` builds where
348 /// [`std::time::SystemTime`] is not available.
350 /// The caller is expected to remember the preimage of `payment_hash` in order to claim a payment
353 /// The `payment_paths` parameter is useful for maintaining the payment recipient's privacy. It
354 /// must contain one or more elements ordered from most-preferred to least-preferred, if there's
355 /// a preference. Note, however, that any privacy is lost if a public node id was used for
356 /// [`Offer::signing_pubkey`].
358 /// Errors if the request contains unknown required features.
360 /// [`Invoice`]: crate::offers::invoice::Invoice
361 /// [`Invoice::created_at`]: crate::offers::invoice::Invoice::created_at
362 pub fn respond_with_no_std(
363 &self, payment_paths: Vec<(BlindedPath, BlindedPayInfo)>, payment_hash: PaymentHash,
364 created_at: core::time::Duration
365 ) -> Result<InvoiceBuilder, SemanticError> {
366 if self.features().requires_unknown_bits() {
367 return Err(SemanticError::UnknownRequiredFeatures);
370 InvoiceBuilder::for_offer(self, payment_paths, created_at, payment_hash)
374 fn as_tlv_stream(&self) -> FullInvoiceRequestTlvStreamRef {
375 let (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream) =
376 self.contents.as_tlv_stream();
377 let signature_tlv_stream = SignatureTlvStreamRef {
378 signature: Some(&self.signature),
380 (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, signature_tlv_stream)
384 impl InvoiceRequestContents {
385 pub(super) fn chain(&self) -> ChainHash {
386 self.chain.unwrap_or_else(|| self.offer.implied_chain())
389 pub(super) fn as_tlv_stream(&self) -> PartialInvoiceRequestTlvStreamRef {
390 let payer = PayerTlvStreamRef {
391 metadata: Some(&self.payer.0),
394 let offer = self.offer.as_tlv_stream();
397 if self.features == InvoiceRequestFeatures::empty() { None }
398 else { Some(&self.features) }
401 let invoice_request = InvoiceRequestTlvStreamRef {
402 chain: self.chain.as_ref(),
403 amount: self.amount_msats,
405 quantity: self.quantity,
406 payer_id: Some(&self.payer_id),
407 payer_note: self.payer_note.as_ref(),
410 (payer, offer, invoice_request)
414 impl Writeable for InvoiceRequest {
415 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
416 WithoutLength(&self.bytes).write(writer)
420 impl Writeable for InvoiceRequestContents {
421 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
422 self.as_tlv_stream().write(writer)
426 tlv_stream!(InvoiceRequestTlvStream, InvoiceRequestTlvStreamRef, 80..160, {
427 (80, chain: ChainHash),
428 (82, amount: (u64, HighZeroBytesDroppedBigSize)),
429 (84, features: (InvoiceRequestFeatures, WithoutLength)),
430 (86, quantity: (u64, HighZeroBytesDroppedBigSize)),
431 (88, payer_id: PublicKey),
432 (89, payer_note: (String, WithoutLength)),
435 type FullInvoiceRequestTlvStream =
436 (PayerTlvStream, OfferTlvStream, InvoiceRequestTlvStream, SignatureTlvStream);
439 type FullInvoiceRequestTlvStreamRef<'a> = (
440 PayerTlvStreamRef<'a>,
441 OfferTlvStreamRef<'a>,
442 InvoiceRequestTlvStreamRef<'a>,
443 SignatureTlvStreamRef<'a>,
446 impl SeekReadable for FullInvoiceRequestTlvStream {
447 fn read<R: io::Read + io::Seek>(r: &mut R) -> Result<Self, DecodeError> {
448 let payer = SeekReadable::read(r)?;
449 let offer = SeekReadable::read(r)?;
450 let invoice_request = SeekReadable::read(r)?;
451 let signature = SeekReadable::read(r)?;
453 Ok((payer, offer, invoice_request, signature))
457 type PartialInvoiceRequestTlvStream = (PayerTlvStream, OfferTlvStream, InvoiceRequestTlvStream);
459 type PartialInvoiceRequestTlvStreamRef<'a> = (
460 PayerTlvStreamRef<'a>,
461 OfferTlvStreamRef<'a>,
462 InvoiceRequestTlvStreamRef<'a>,
465 impl TryFrom<Vec<u8>> for InvoiceRequest {
466 type Error = ParseError;
468 fn try_from(bytes: Vec<u8>) -> Result<Self, Self::Error> {
469 let invoice_request = ParsedMessage::<FullInvoiceRequestTlvStream>::try_from(bytes)?;
470 let ParsedMessage { bytes, tlv_stream } = invoice_request;
472 payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream,
473 SignatureTlvStream { signature },
475 let contents = InvoiceRequestContents::try_from(
476 (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream)
479 let signature = match signature {
480 None => return Err(ParseError::InvalidSemantics(SemanticError::MissingSignature)),
481 Some(signature) => signature,
483 merkle::verify_signature(&signature, SIGNATURE_TAG, &bytes, contents.payer_id)?;
485 Ok(InvoiceRequest { bytes, contents, signature })
489 impl TryFrom<PartialInvoiceRequestTlvStream> for InvoiceRequestContents {
490 type Error = SemanticError;
492 fn try_from(tlv_stream: PartialInvoiceRequestTlvStream) -> Result<Self, Self::Error> {
494 PayerTlvStream { metadata },
496 InvoiceRequestTlvStream { chain, amount, features, quantity, payer_id, payer_note },
499 let payer = match metadata {
500 None => return Err(SemanticError::MissingPayerMetadata),
501 Some(metadata) => PayerContents(metadata),
503 let offer = OfferContents::try_from(offer_tlv_stream)?;
505 if !offer.supports_chain(chain.unwrap_or_else(|| offer.implied_chain())) {
506 return Err(SemanticError::UnsupportedChain);
509 if offer.amount().is_none() && amount.is_none() {
510 return Err(SemanticError::MissingAmount);
513 offer.check_quantity(quantity)?;
514 offer.check_amount_msats_for_quantity(amount, quantity)?;
516 let features = features.unwrap_or_else(InvoiceRequestFeatures::empty);
518 let payer_id = match payer_id {
519 None => return Err(SemanticError::MissingPayerId),
520 Some(payer_id) => payer_id,
523 Ok(InvoiceRequestContents {
524 payer, offer, chain, amount_msats: amount, features, quantity, payer_id, payer_note,
531 use super::{InvoiceRequest, InvoiceRequestTlvStreamRef, SIGNATURE_TAG};
533 use bitcoin::blockdata::constants::ChainHash;
534 use bitcoin::network::constants::Network;
535 use bitcoin::secp256k1::{KeyPair, Secp256k1, SecretKey, self};
536 use core::convert::{Infallible, TryFrom};
537 use core::num::NonZeroU64;
538 #[cfg(feature = "std")]
539 use core::time::Duration;
540 use crate::ln::features::InvoiceRequestFeatures;
541 use crate::ln::msgs::{DecodeError, MAX_VALUE_MSAT};
542 use crate::offers::merkle::{SignError, SignatureTlvStreamRef, self};
543 use crate::offers::offer::{Amount, OfferBuilder, OfferTlvStreamRef, Quantity};
544 use crate::offers::parse::{ParseError, SemanticError};
545 use crate::offers::payer::PayerTlvStreamRef;
546 use crate::offers::test_utils::*;
547 use crate::util::ser::{BigSize, Writeable};
548 use crate::util::string::PrintableString;
551 fn builds_invoice_request_with_defaults() {
552 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
555 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
557 .sign(payer_sign).unwrap();
559 let mut buffer = Vec::new();
560 invoice_request.write(&mut buffer).unwrap();
562 assert_eq!(invoice_request.bytes, buffer.as_slice());
563 assert_eq!(invoice_request.metadata(), &[1; 32]);
564 assert_eq!(invoice_request.chain(), ChainHash::using_genesis_block(Network::Bitcoin));
565 assert_eq!(invoice_request.amount_msats(), None);
566 assert_eq!(invoice_request.features(), &InvoiceRequestFeatures::empty());
567 assert_eq!(invoice_request.quantity(), None);
568 assert_eq!(invoice_request.payer_id(), payer_pubkey());
569 assert_eq!(invoice_request.payer_note(), None);
571 merkle::verify_signature(
572 &invoice_request.signature, SIGNATURE_TAG, &invoice_request.bytes, payer_pubkey()
577 invoice_request.as_tlv_stream(),
579 PayerTlvStreamRef { metadata: Some(&vec![1; 32]) },
585 description: Some(&String::from("foo")),
587 absolute_expiry: None,
591 node_id: Some(&recipient_pubkey()),
593 InvoiceRequestTlvStreamRef {
598 payer_id: Some(&payer_pubkey()),
601 SignatureTlvStreamRef { signature: Some(&invoice_request.signature()) },
605 if let Err(e) = InvoiceRequest::try_from(buffer) {
606 panic!("error parsing invoice request: {:?}", e);
610 #[cfg(feature = "std")]
612 fn builds_invoice_request_from_offer_with_expiration() {
613 let future_expiry = Duration::from_secs(u64::max_value());
614 let past_expiry = Duration::from_secs(0);
616 if let Err(e) = OfferBuilder::new("foo".into(), recipient_pubkey())
618 .absolute_expiry(future_expiry)
620 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
623 panic!("error building invoice_request: {:?}", e);
626 match OfferBuilder::new("foo".into(), recipient_pubkey())
628 .absolute_expiry(past_expiry)
630 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
633 Ok(_) => panic!("expected error"),
634 Err(e) => assert_eq!(e, SemanticError::AlreadyExpired),
639 fn builds_invoice_request_with_chain() {
640 let mainnet = ChainHash::using_genesis_block(Network::Bitcoin);
641 let testnet = ChainHash::using_genesis_block(Network::Testnet);
643 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
646 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
647 .chain(Network::Bitcoin).unwrap()
649 .sign(payer_sign).unwrap();
650 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
651 assert_eq!(invoice_request.chain(), mainnet);
652 assert_eq!(tlv_stream.chain, None);
654 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
656 .chain(Network::Testnet)
658 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
659 .chain(Network::Testnet).unwrap()
661 .sign(payer_sign).unwrap();
662 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
663 assert_eq!(invoice_request.chain(), testnet);
664 assert_eq!(tlv_stream.chain, Some(&testnet));
666 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
668 .chain(Network::Bitcoin)
669 .chain(Network::Testnet)
671 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
672 .chain(Network::Bitcoin).unwrap()
674 .sign(payer_sign).unwrap();
675 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
676 assert_eq!(invoice_request.chain(), mainnet);
677 assert_eq!(tlv_stream.chain, None);
679 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
681 .chain(Network::Bitcoin)
682 .chain(Network::Testnet)
684 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
685 .chain(Network::Bitcoin).unwrap()
686 .chain(Network::Testnet).unwrap()
688 .sign(payer_sign).unwrap();
689 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
690 assert_eq!(invoice_request.chain(), testnet);
691 assert_eq!(tlv_stream.chain, Some(&testnet));
693 match OfferBuilder::new("foo".into(), recipient_pubkey())
695 .chain(Network::Testnet)
697 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
698 .chain(Network::Bitcoin)
700 Ok(_) => panic!("expected error"),
701 Err(e) => assert_eq!(e, SemanticError::UnsupportedChain),
704 match OfferBuilder::new("foo".into(), recipient_pubkey())
706 .chain(Network::Testnet)
708 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
711 Ok(_) => panic!("expected error"),
712 Err(e) => assert_eq!(e, SemanticError::UnsupportedChain),
717 fn builds_invoice_request_with_amount() {
718 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
721 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
722 .amount_msats(1000).unwrap()
724 .sign(payer_sign).unwrap();
725 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
726 assert_eq!(invoice_request.amount_msats(), Some(1000));
727 assert_eq!(tlv_stream.amount, Some(1000));
729 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
732 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
733 .amount_msats(1001).unwrap()
734 .amount_msats(1000).unwrap()
736 .sign(payer_sign).unwrap();
737 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
738 assert_eq!(invoice_request.amount_msats(), Some(1000));
739 assert_eq!(tlv_stream.amount, Some(1000));
741 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
744 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
745 .amount_msats(1001).unwrap()
747 .sign(payer_sign).unwrap();
748 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
749 assert_eq!(invoice_request.amount_msats(), Some(1001));
750 assert_eq!(tlv_stream.amount, Some(1001));
752 match OfferBuilder::new("foo".into(), recipient_pubkey())
755 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
758 Ok(_) => panic!("expected error"),
759 Err(e) => assert_eq!(e, SemanticError::InsufficientAmount),
762 match OfferBuilder::new("foo".into(), recipient_pubkey())
764 .supported_quantity(Quantity::Unbounded)
766 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
767 .quantity(2).unwrap()
770 Ok(_) => panic!("expected error"),
771 Err(e) => assert_eq!(e, SemanticError::InsufficientAmount),
774 match OfferBuilder::new("foo".into(), recipient_pubkey())
777 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
778 .amount_msats(MAX_VALUE_MSAT + 1)
780 Ok(_) => panic!("expected error"),
781 Err(e) => assert_eq!(e, SemanticError::InvalidAmount),
784 match OfferBuilder::new("foo".into(), recipient_pubkey())
786 .supported_quantity(Quantity::Unbounded)
788 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
789 .amount_msats(1000).unwrap()
790 .quantity(2).unwrap()
793 Ok(_) => panic!("expected error"),
794 Err(e) => assert_eq!(e, SemanticError::InsufficientAmount),
797 match OfferBuilder::new("foo".into(), recipient_pubkey())
799 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
802 Ok(_) => panic!("expected error"),
803 Err(e) => assert_eq!(e, SemanticError::MissingAmount),
806 match OfferBuilder::new("foo".into(), recipient_pubkey())
808 .supported_quantity(Quantity::Unbounded)
810 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
811 .quantity(u64::max_value()).unwrap()
814 Ok(_) => panic!("expected error"),
815 Err(e) => assert_eq!(e, SemanticError::InvalidAmount),
820 fn builds_invoice_request_with_features() {
821 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
824 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
825 .features_unchecked(InvoiceRequestFeatures::unknown())
827 .sign(payer_sign).unwrap();
828 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
829 assert_eq!(invoice_request.features(), &InvoiceRequestFeatures::unknown());
830 assert_eq!(tlv_stream.features, Some(&InvoiceRequestFeatures::unknown()));
832 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
835 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
836 .features_unchecked(InvoiceRequestFeatures::unknown())
837 .features_unchecked(InvoiceRequestFeatures::empty())
839 .sign(payer_sign).unwrap();
840 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
841 assert_eq!(invoice_request.features(), &InvoiceRequestFeatures::empty());
842 assert_eq!(tlv_stream.features, None);
846 fn builds_invoice_request_with_quantity() {
847 let one = NonZeroU64::new(1).unwrap();
848 let ten = NonZeroU64::new(10).unwrap();
850 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
852 .supported_quantity(Quantity::One)
854 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
856 .sign(payer_sign).unwrap();
857 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
858 assert_eq!(invoice_request.quantity(), None);
859 assert_eq!(tlv_stream.quantity, None);
861 match OfferBuilder::new("foo".into(), recipient_pubkey())
863 .supported_quantity(Quantity::One)
865 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
866 .amount_msats(2_000).unwrap()
869 Ok(_) => panic!("expected error"),
870 Err(e) => assert_eq!(e, SemanticError::UnexpectedQuantity),
873 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
875 .supported_quantity(Quantity::Bounded(ten))
877 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
878 .amount_msats(10_000).unwrap()
879 .quantity(10).unwrap()
881 .sign(payer_sign).unwrap();
882 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
883 assert_eq!(invoice_request.amount_msats(), Some(10_000));
884 assert_eq!(tlv_stream.amount, Some(10_000));
886 match OfferBuilder::new("foo".into(), recipient_pubkey())
888 .supported_quantity(Quantity::Bounded(ten))
890 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
891 .amount_msats(11_000).unwrap()
894 Ok(_) => panic!("expected error"),
895 Err(e) => assert_eq!(e, SemanticError::InvalidQuantity),
898 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
900 .supported_quantity(Quantity::Unbounded)
902 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
903 .amount_msats(2_000).unwrap()
904 .quantity(2).unwrap()
906 .sign(payer_sign).unwrap();
907 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
908 assert_eq!(invoice_request.amount_msats(), Some(2_000));
909 assert_eq!(tlv_stream.amount, Some(2_000));
911 match OfferBuilder::new("foo".into(), recipient_pubkey())
913 .supported_quantity(Quantity::Unbounded)
915 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
918 Ok(_) => panic!("expected error"),
919 Err(e) => assert_eq!(e, SemanticError::MissingQuantity),
922 match OfferBuilder::new("foo".into(), recipient_pubkey())
924 .supported_quantity(Quantity::Bounded(one))
926 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
929 Ok(_) => panic!("expected error"),
930 Err(e) => assert_eq!(e, SemanticError::MissingQuantity),
935 fn builds_invoice_request_with_payer_note() {
936 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
939 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
940 .payer_note("bar".into())
942 .sign(payer_sign).unwrap();
943 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
944 assert_eq!(invoice_request.payer_note(), Some(PrintableString("bar")));
945 assert_eq!(tlv_stream.payer_note, Some(&String::from("bar")));
947 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
950 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
951 .payer_note("bar".into())
952 .payer_note("baz".into())
954 .sign(payer_sign).unwrap();
955 let (_, _, tlv_stream, _) = invoice_request.as_tlv_stream();
956 assert_eq!(invoice_request.payer_note(), Some(PrintableString("baz")));
957 assert_eq!(tlv_stream.payer_note, Some(&String::from("baz")));
961 fn fails_signing_invoice_request() {
962 match OfferBuilder::new("foo".into(), recipient_pubkey())
965 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
969 Ok(_) => panic!("expected error"),
970 Err(e) => assert_eq!(e, SignError::Signing(())),
973 match OfferBuilder::new("foo".into(), recipient_pubkey())
976 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
978 .sign(recipient_sign)
980 Ok(_) => panic!("expected error"),
981 Err(e) => assert_eq!(e, SignError::Verification(secp256k1::Error::InvalidSignature)),
986 fn parses_invoice_request_with_metadata() {
987 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
990 .request_invoice(vec![42; 32], payer_pubkey()).unwrap()
992 .sign(payer_sign).unwrap();
994 let mut buffer = Vec::new();
995 invoice_request.write(&mut buffer).unwrap();
997 if let Err(e) = InvoiceRequest::try_from(buffer) {
998 panic!("error parsing invoice_request: {:?}", e);
1003 fn parses_invoice_request_with_chain() {
1004 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1007 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1008 .chain(Network::Bitcoin).unwrap()
1010 .sign(payer_sign).unwrap();
1012 let mut buffer = Vec::new();
1013 invoice_request.write(&mut buffer).unwrap();
1015 if let Err(e) = InvoiceRequest::try_from(buffer) {
1016 panic!("error parsing invoice_request: {:?}", e);
1019 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1022 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1023 .chain_unchecked(Network::Testnet)
1025 .sign(payer_sign).unwrap();
1027 let mut buffer = Vec::new();
1028 invoice_request.write(&mut buffer).unwrap();
1030 match InvoiceRequest::try_from(buffer) {
1031 Ok(_) => panic!("expected error"),
1032 Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::UnsupportedChain)),
1037 fn parses_invoice_request_with_amount() {
1038 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1041 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1043 .sign(payer_sign).unwrap();
1045 let mut buffer = Vec::new();
1046 invoice_request.write(&mut buffer).unwrap();
1048 if let Err(e) = InvoiceRequest::try_from(buffer) {
1049 panic!("error parsing invoice_request: {:?}", e);
1052 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1054 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1055 .amount_msats(1000).unwrap()
1057 .sign(payer_sign).unwrap();
1059 let mut buffer = Vec::new();
1060 invoice_request.write(&mut buffer).unwrap();
1062 if let Err(e) = InvoiceRequest::try_from(buffer) {
1063 panic!("error parsing invoice_request: {:?}", e);
1066 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1068 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1070 .sign(payer_sign).unwrap();
1072 let mut buffer = Vec::new();
1073 invoice_request.write(&mut buffer).unwrap();
1075 match InvoiceRequest::try_from(buffer) {
1076 Ok(_) => panic!("expected error"),
1077 Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingAmount)),
1080 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1083 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1084 .amount_msats_unchecked(999)
1086 .sign(payer_sign).unwrap();
1088 let mut buffer = Vec::new();
1089 invoice_request.write(&mut buffer).unwrap();
1091 match InvoiceRequest::try_from(buffer) {
1092 Ok(_) => panic!("expected error"),
1093 Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::InsufficientAmount)),
1096 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1097 .amount(Amount::Currency { iso4217_code: *b"USD", amount: 1000 })
1099 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1101 .sign(payer_sign).unwrap();
1103 let mut buffer = Vec::new();
1104 invoice_request.write(&mut buffer).unwrap();
1106 match InvoiceRequest::try_from(buffer) {
1107 Ok(_) => panic!("expected error"),
1109 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::UnsupportedCurrency));
1113 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1115 .supported_quantity(Quantity::Unbounded)
1117 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1118 .quantity(u64::max_value()).unwrap()
1120 .sign(payer_sign).unwrap();
1122 let mut buffer = Vec::new();
1123 invoice_request.write(&mut buffer).unwrap();
1125 match InvoiceRequest::try_from(buffer) {
1126 Ok(_) => panic!("expected error"),
1127 Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::InvalidAmount)),
1132 fn parses_invoice_request_with_quantity() {
1133 let one = NonZeroU64::new(1).unwrap();
1134 let ten = NonZeroU64::new(10).unwrap();
1136 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1138 .supported_quantity(Quantity::One)
1140 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1142 .sign(payer_sign).unwrap();
1144 let mut buffer = Vec::new();
1145 invoice_request.write(&mut buffer).unwrap();
1147 if let Err(e) = InvoiceRequest::try_from(buffer) {
1148 panic!("error parsing invoice_request: {:?}", e);
1151 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1153 .supported_quantity(Quantity::One)
1155 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1156 .amount_msats(2_000).unwrap()
1157 .quantity_unchecked(2)
1159 .sign(payer_sign).unwrap();
1161 let mut buffer = Vec::new();
1162 invoice_request.write(&mut buffer).unwrap();
1164 match InvoiceRequest::try_from(buffer) {
1165 Ok(_) => panic!("expected error"),
1167 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::UnexpectedQuantity));
1171 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1173 .supported_quantity(Quantity::Bounded(ten))
1175 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1176 .amount_msats(10_000).unwrap()
1177 .quantity(10).unwrap()
1179 .sign(payer_sign).unwrap();
1181 let mut buffer = Vec::new();
1182 invoice_request.write(&mut buffer).unwrap();
1184 if let Err(e) = InvoiceRequest::try_from(buffer) {
1185 panic!("error parsing invoice_request: {:?}", e);
1188 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1190 .supported_quantity(Quantity::Bounded(ten))
1192 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1193 .amount_msats(11_000).unwrap()
1194 .quantity_unchecked(11)
1196 .sign(payer_sign).unwrap();
1198 let mut buffer = Vec::new();
1199 invoice_request.write(&mut buffer).unwrap();
1201 match InvoiceRequest::try_from(buffer) {
1202 Ok(_) => panic!("expected error"),
1203 Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::InvalidQuantity)),
1206 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1208 .supported_quantity(Quantity::Unbounded)
1210 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1211 .amount_msats(2_000).unwrap()
1212 .quantity(2).unwrap()
1214 .sign(payer_sign).unwrap();
1216 let mut buffer = Vec::new();
1217 invoice_request.write(&mut buffer).unwrap();
1219 if let Err(e) = InvoiceRequest::try_from(buffer) {
1220 panic!("error parsing invoice_request: {:?}", e);
1223 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1225 .supported_quantity(Quantity::Unbounded)
1227 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1229 .sign(payer_sign).unwrap();
1231 let mut buffer = Vec::new();
1232 invoice_request.write(&mut buffer).unwrap();
1234 match InvoiceRequest::try_from(buffer) {
1235 Ok(_) => panic!("expected error"),
1236 Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingQuantity)),
1239 let invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1241 .supported_quantity(Quantity::Bounded(one))
1243 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1245 .sign(payer_sign).unwrap();
1247 let mut buffer = Vec::new();
1248 invoice_request.write(&mut buffer).unwrap();
1250 match InvoiceRequest::try_from(buffer) {
1251 Ok(_) => panic!("expected error"),
1252 Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingQuantity)),
1257 fn fails_parsing_invoice_request_without_metadata() {
1258 let offer = OfferBuilder::new("foo".into(), recipient_pubkey())
1261 let unsigned_invoice_request = offer.request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1263 let mut tlv_stream = unsigned_invoice_request.invoice_request.as_tlv_stream();
1264 tlv_stream.0.metadata = None;
1266 let mut buffer = Vec::new();
1267 tlv_stream.write(&mut buffer).unwrap();
1269 match InvoiceRequest::try_from(buffer) {
1270 Ok(_) => panic!("expected error"),
1272 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingPayerMetadata));
1278 fn fails_parsing_invoice_request_without_payer_id() {
1279 let offer = OfferBuilder::new("foo".into(), recipient_pubkey())
1282 let unsigned_invoice_request = offer.request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1284 let mut tlv_stream = unsigned_invoice_request.invoice_request.as_tlv_stream();
1285 tlv_stream.2.payer_id = None;
1287 let mut buffer = Vec::new();
1288 tlv_stream.write(&mut buffer).unwrap();
1290 match InvoiceRequest::try_from(buffer) {
1291 Ok(_) => panic!("expected error"),
1292 Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingPayerId)),
1297 fn fails_parsing_invoice_request_without_node_id() {
1298 let offer = OfferBuilder::new("foo".into(), recipient_pubkey())
1301 let unsigned_invoice_request = offer.request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1303 let mut tlv_stream = unsigned_invoice_request.invoice_request.as_tlv_stream();
1304 tlv_stream.1.node_id = None;
1306 let mut buffer = Vec::new();
1307 tlv_stream.write(&mut buffer).unwrap();
1309 match InvoiceRequest::try_from(buffer) {
1310 Ok(_) => panic!("expected error"),
1312 assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingSigningPubkey));
1318 fn fails_parsing_invoice_request_without_signature() {
1319 let mut buffer = Vec::new();
1320 OfferBuilder::new("foo".into(), recipient_pubkey())
1323 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1326 .write(&mut buffer).unwrap();
1328 match InvoiceRequest::try_from(buffer) {
1329 Ok(_) => panic!("expected error"),
1330 Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingSignature)),
1335 fn fails_parsing_invoice_request_with_invalid_signature() {
1336 let mut invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
1339 .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
1341 .sign(payer_sign).unwrap();
1342 let last_signature_byte = invoice_request.bytes.last_mut().unwrap();
1343 *last_signature_byte = last_signature_byte.wrapping_add(1);
1345 let mut buffer = Vec::new();
1346 invoice_request.write(&mut buffer).unwrap();
1348 match InvoiceRequest::try_from(buffer) {
1349 Ok(_) => panic!("expected error"),
1351 assert_eq!(e, ParseError::InvalidSignature(secp256k1::Error::InvalidSignature));
1357 fn fails_parsing_invoice_request_with_extra_tlv_records() {
1358 let secp_ctx = Secp256k1::new();
1359 let keys = KeyPair::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
1360 let invoice_request = OfferBuilder::new("foo".into(), keys.public_key())
1363 .request_invoice(vec![1; 32], keys.public_key()).unwrap()
1365 .sign::<_, Infallible>(|digest| Ok(secp_ctx.sign_schnorr_no_aux_rand(digest, &keys)))
1368 let mut encoded_invoice_request = Vec::new();
1369 invoice_request.write(&mut encoded_invoice_request).unwrap();
1370 BigSize(1002).write(&mut encoded_invoice_request).unwrap();
1371 BigSize(32).write(&mut encoded_invoice_request).unwrap();
1372 [42u8; 32].write(&mut encoded_invoice_request).unwrap();
1374 match InvoiceRequest::try_from(encoded_invoice_request) {
1375 Ok(_) => panic!("expected error"),
1376 Err(e) => assert_eq!(e, ParseError::Decode(DecodeError::InvalidValue)),