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

   1 // Prefix these with `rustdoc::` when we update our MSRV to be >= 1.52 to remove warnings.
   2 #![deny(broken_intra_doc_links)]
   3 #![deny(private_intra_doc_links)]
   4
   5 #![deny(missing_docs)]
   6 #![deny(non_upper_case_globals)]
   7 #![deny(non_camel_case_types)]
   8 #![deny(non_snake_case)]
   9 #![deny(unused_mut)]
  10
  11 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
  12
  13 #![cfg_attr(feature = "strict", deny(warnings))]
  14 #![cfg_attr(all(not(feature = "std"), not(test)), no_std)]
  15
  16 //! This crate provides data structures to represent
  17 //! [lightning BOLT11](https://github.com/lightning/bolts/blob/master/11-payment-encoding.md)
  18 //! invoices and functions to create, encode and decode these. If you just want to use the standard
  19 //! en-/decoding functionality this should get you started:
  20 //!
  21 //!   * For parsing use `str::parse::<Invoice>(&self)` (see the docs of `impl FromStr for Invoice`)
  22 //!   * For constructing invoices use the `InvoiceBuilder`
  23 //!   * For serializing invoices use the `Display`/`ToString` traits
  24
  25 #[cfg(not(any(feature = "std", feature = "no-std")))]
  26 compile_error!("at least one of the `std` or `no-std` features must be enabled");
  27
  28 pub mod payment;
  29 pub mod utils;
  30
  31 pub(crate) mod time_utils;
  32
  33 extern crate bech32;
  34 extern crate bitcoin_hashes;
  35 #[macro_use] extern crate lightning;
  36 extern crate num_traits;
  37 extern crate secp256k1;
  38 extern crate alloc;
  39 #[cfg(any(test, feature = "std"))]
  40 extern crate core;
  41 #[cfg(feature = "serde")]
  42 extern crate serde;
  43
  44 #[cfg(feature = "std")]
  45 use std::time::SystemTime;
  46
  47 use bech32::u5;
  48 use bitcoin_hashes::Hash;
  49 use bitcoin_hashes::sha256;
  50 use lightning::ln::PaymentSecret;
  51 use lightning::ln::features::InvoiceFeatures;
  52 #[cfg(any(doc, test))]
  53 use lightning::routing::gossip::RoutingFees;
  54 use lightning::routing::router::RouteHint;
  55 use lightning::util::invoice::construct_invoice_preimage;
  56
  57 use secp256k1::PublicKey;
  58 use secp256k1::{Message, Secp256k1};
  59 use secp256k1::ecdsa::RecoverableSignature;
  60
  61 use core::fmt::{Display, Formatter, self};
  62 use core::iter::FilterMap;
  63 use core::num::ParseIntError;
  64 use core::ops::Deref;
  65 use core::slice::Iter;
  66 use core::time::Duration;
  67 use core::str;
  68
  69 #[cfg(feature = "serde")]
  70 use serde::{Deserialize, Deserializer,Serialize, Serializer, de::Error};
  71
  72 mod de;
  73 mod ser;
  74 mod tb;
  75
  76 mod prelude {
  77         #[cfg(feature = "hashbrown")]
  78         extern crate hashbrown;
  79
  80         pub use alloc::{vec, vec::Vec, string::String, collections::VecDeque, boxed::Box};
  81         #[cfg(not(feature = "hashbrown"))]
  82         pub use std::collections::{HashMap, HashSet, hash_map};
  83         #[cfg(feature = "hashbrown")]
  84         pub use self::hashbrown::{HashMap, HashSet, hash_map};
  85
  86         pub use alloc::string::ToString;
  87 }
  88
  89 use crate::prelude::*;
  90
  91 /// Sync compat for std/no_std
  92 #[cfg(feature = "std")]
  93 mod sync {
  94         pub use ::std::sync::{Mutex, MutexGuard};
  95 }
  96
  97 /// Sync compat for std/no_std
  98 #[cfg(not(feature = "std"))]
  99 mod sync;
 100
 101 /// Errors that indicate what is wrong with the invoice. They have some granularity for debug
 102 /// reasons, but should generally result in an "invalid BOLT11 invoice" message for the user.
 103 #[allow(missing_docs)]
 104 #[derive(PartialEq, Eq, Debug, Clone)]
 105 pub enum ParseError {
 106         Bech32Error(bech32::Error),
 107         ParseAmountError(ParseIntError),
 108         MalformedSignature(secp256k1::Error),
 109         BadPrefix,
 110         UnknownCurrency,
 111         UnknownSiPrefix,
 112         MalformedHRP,
 113         TooShortDataPart,
 114         UnexpectedEndOfTaggedFields,
 115         DescriptionDecodeError(str::Utf8Error),
 116         PaddingError,
 117         IntegerOverflowError,
 118         InvalidSegWitProgramLength,
 119         InvalidPubKeyHashLength,
 120         InvalidScriptHashLength,
 121         InvalidRecoveryId,
 122         InvalidSliceLength(String),
 123
 124         /// Not an error, but used internally to signal that a part of the invoice should be ignored
 125         /// according to BOLT11
 126         Skip,
 127 }
 128
 129 /// Indicates that something went wrong while parsing or validating the invoice. Parsing errors
 130 /// should be mostly seen as opaque and are only there for debugging reasons. Semantic errors
 131 /// like wrong signatures, missing fields etc. could mean that someone tampered with the invoice.
 132 #[derive(PartialEq, Eq, Debug, Clone)]
 133 pub enum ParseOrSemanticError {
 134         /// The invoice couldn't be decoded
 135         ParseError(ParseError),
 136
 137         /// The invoice could be decoded but violates the BOLT11 standard
 138         SemanticError(crate::SemanticError),
 139 }
 140
 141 /// The number of bits used to represent timestamps as defined in BOLT 11.
 142 const TIMESTAMP_BITS: usize = 35;
 143
 144 /// The maximum timestamp as [`Duration::as_secs`] since the Unix epoch allowed by [`BOLT 11`].
 145 ///
 146 /// [BOLT 11]: https://github.com/lightning/bolts/blob/master/11-payment-encoding.md
 147 pub const MAX_TIMESTAMP: u64 = (1 << TIMESTAMP_BITS) - 1;
 148
 149 /// Default expiry time as defined by [BOLT 11].
 150 ///
 151 /// [BOLT 11]: https://github.com/lightning/bolts/blob/master/11-payment-encoding.md
 152 pub const DEFAULT_EXPIRY_TIME: u64 = 3600;
 153
 154 /// Default minimum final CLTV expiry as defined by [BOLT 11].
 155 ///
 156 /// Note that this is *not* the same value as rust-lightning's minimum CLTV expiry, which is
 157 /// provided in [`MIN_FINAL_CLTV_EXPIRY`].
 158 ///
 159 /// [BOLT 11]: https://github.com/lightning/bolts/blob/master/11-payment-encoding.md
 160 /// [`MIN_FINAL_CLTV_EXPIRY`]: lightning::ln::channelmanager::MIN_FINAL_CLTV_EXPIRY
 161 pub const DEFAULT_MIN_FINAL_CLTV_EXPIRY: u64 = 18;
 162
 163 /// Builder for `Invoice`s. It's the most convenient and advised way to use this library. It ensures
 164 /// that only a semantically and syntactically correct Invoice can be built using it.
 165 ///
 166 /// ```
 167 /// extern crate secp256k1;
 168 /// extern crate lightning;
 169 /// extern crate lightning_invoice;
 170 /// extern crate bitcoin_hashes;
 171 ///
 172 /// use bitcoin_hashes::Hash;
 173 /// use bitcoin_hashes::sha256;
 174 ///
 175 /// use secp256k1::Secp256k1;
 176 /// use secp256k1::SecretKey;
 177 ///
 178 /// use lightning::ln::PaymentSecret;
 179 ///
 180 /// use lightning_invoice::{Currency, InvoiceBuilder};
 181 ///
 182 /// # #[cfg(not(feature = "std"))]
 183 /// # fn main() {}
 184 /// # #[cfg(feature = "std")]
 185 /// # fn main() {
 186 /// let private_key = SecretKey::from_slice(
 187 ///             &[
 188 ///                     0xe1, 0x26, 0xf6, 0x8f, 0x7e, 0xaf, 0xcc, 0x8b, 0x74, 0xf5, 0x4d, 0x26, 0x9f,
 189 ///                     0xe2, 0x06, 0xbe, 0x71, 0x50, 0x00, 0xf9, 0x4d, 0xac, 0x06, 0x7d, 0x1c, 0x04,
 190 ///             0xa8, 0xca, 0x3b, 0x2d, 0xb7, 0x34
 191 ///     ][..]
 192 ///     ).unwrap();
 193 ///
 194 /// let payment_hash = sha256::Hash::from_slice(&[0; 32][..]).unwrap();
 195 /// let payment_secret = PaymentSecret([42u8; 32]);
 196 ///
 197 /// let invoice = InvoiceBuilder::new(Currency::Bitcoin)
 198 ///     .description("Coins pls!".into())
 199 ///     .payment_hash(payment_hash)
 200 ///     .payment_secret(payment_secret)
 201 ///     .current_timestamp()
 202 ///     .min_final_cltv_expiry(144)
 203 ///     .build_signed(|hash| {
 204 ///             Secp256k1::new().sign_ecdsa_recoverable(hash, &private_key)
 205 ///     })
 206 ///     .unwrap();
 207 ///
 208 /// assert!(invoice.to_string().starts_with("lnbc1"));
 209 /// # }
 210 /// ```
 211 ///
 212 /// # Type parameters
 213 /// The two parameters `D` and `H` signal if the builder already contains the correct amount of the
 214 /// given field:
 215 ///  * `D`: exactly one `Description` or `DescriptionHash`
 216 ///  * `H`: exactly one `PaymentHash`
 217 ///  * `T`: the timestamp is set
 218 ///
 219 /// (C-not exported) as we likely need to manually select one set of boolean type parameters.
 220 #[derive(Eq, PartialEq, Debug, Clone)]
 221 pub struct InvoiceBuilder<D: tb::Bool, H: tb::Bool, T: tb::Bool, C: tb::Bool, S: tb::Bool> {
 222         currency: Currency,
 223         amount: Option<u64>,
 224         si_prefix: Option<SiPrefix>,
 225         timestamp: Option<PositiveTimestamp>,
 226         tagged_fields: Vec<TaggedField>,
 227         error: Option<CreationError>,
 228
 229         phantom_d: core::marker::PhantomData<D>,
 230         phantom_h: core::marker::PhantomData<H>,
 231         phantom_t: core::marker::PhantomData<T>,
 232         phantom_c: core::marker::PhantomData<C>,
 233         phantom_s: core::marker::PhantomData<S>,
 234 }
 235
 236 /// Represents a syntactically and semantically correct lightning BOLT11 invoice.
 237 ///
 238 /// There are three ways to construct an `Invoice`:
 239 ///  1. using `InvoiceBuilder`
 240 ///  2. using `Invoice::from_signed(SignedRawInvoice)`
 241 ///  3. using `str::parse::<Invoice>(&str)`
 242 #[derive(Eq, PartialEq, Debug, Clone, Hash)]
 243 pub struct Invoice {
 244         signed_invoice: SignedRawInvoice,
 245 }
 246
 247 /// Represents the description of an invoice which has to be either a directly included string or
 248 /// a hash of a description provided out of band.
 249 ///
 250 /// (C-not exported) As we don't have a good way to map the reference lifetimes making this
 251 /// practically impossible to use safely in languages like C.
 252 #[derive(Eq, PartialEq, Debug, Clone)]
 253 pub enum InvoiceDescription<'f> {
 254         /// Reference to the directly supplied description in the invoice
 255         Direct(&'f Description),
 256
 257         /// Reference to the description's hash included in the invoice
 258         Hash(&'f Sha256),
 259 }
 260
 261 /// Represents a signed `RawInvoice` with cached hash. The signature is not checked and may be
 262 /// invalid.
 263 ///
 264 /// # Invariants
 265 /// The hash has to be either from the deserialized invoice or from the serialized `raw_invoice`.
 266 #[derive(Eq, PartialEq, Debug, Clone, Hash)]
 267 pub struct SignedRawInvoice {
 268         /// The rawInvoice that the signature belongs to
 269         raw_invoice: RawInvoice,
 270
 271         /// Hash of the `RawInvoice` that will be used to check the signature.
 272         ///
 273         /// * if the `SignedRawInvoice` was deserialized the hash is of from the original encoded form,
 274         /// since it's not guaranteed that encoding it again will lead to the same result since integers
 275         /// could have been encoded with leading zeroes etc.
 276         /// * if the `SignedRawInvoice` was constructed manually the hash will be the calculated hash
 277         /// from the `RawInvoice`
 278         hash: [u8; 32],
 279
 280         /// signature of the payment request
 281         signature: InvoiceSignature,
 282 }
 283
 284 /// Represents an syntactically correct Invoice for a payment on the lightning network,
 285 /// but without the signature information.
 286 /// De- and encoding should not lead to information loss but may lead to different hashes.
 287 ///
 288 /// For methods without docs see the corresponding methods in `Invoice`.
 289 #[derive(Eq, PartialEq, Debug, Clone, Hash)]
 290 pub struct RawInvoice {
 291         /// human readable part
 292         pub hrp: RawHrp,
 293
 294         /// data part
 295         pub data: RawDataPart,
 296 }
 297
 298 /// Data of the `RawInvoice` that is encoded in the human readable part
 299 ///
 300 /// (C-not exported) As we don't yet support `Option<Enum>`
 301 #[derive(Eq, PartialEq, Debug, Clone, Hash)]
 302 pub struct RawHrp {
 303         /// The currency deferred from the 3rd and 4th character of the bech32 transaction
 304         pub currency: Currency,
 305
 306         /// The amount that, multiplied by the SI prefix, has to be payed
 307         pub raw_amount: Option<u64>,
 308
 309         /// SI prefix that gets multiplied with the `raw_amount`
 310         pub si_prefix: Option<SiPrefix>,
 311 }
 312
 313 /// Data of the `RawInvoice` that is encoded in the data part
 314 #[derive(Eq, PartialEq, Debug, Clone, Hash)]
 315 pub struct RawDataPart {
 316         /// generation time of the invoice
 317         pub timestamp: PositiveTimestamp,
 318
 319         /// tagged fields of the payment request
 320         pub tagged_fields: Vec<RawTaggedField>,
 321 }
 322
 323 /// A timestamp that refers to a date after 1 January 1970.
 324 ///
 325 /// # Invariants
 326 ///
 327 /// The Unix timestamp representing the stored time has to be positive and no greater than
 328 /// [`MAX_TIMESTAMP`].
 329 #[derive(Eq, PartialEq, Debug, Clone, Hash)]
 330 pub struct PositiveTimestamp(Duration);
 331
 332 /// SI prefixes for the human readable part
 333 #[derive(Eq, PartialEq, Debug, Clone, Copy, Hash)]
 334 pub enum SiPrefix {
 335         /// 10^-3
 336         Milli,
 337         /// 10^-6
 338         Micro,
 339         /// 10^-9
 340         Nano,
 341         /// 10^-12
 342         Pico,
 343 }
 344
 345 impl SiPrefix {
 346         /// Returns the multiplier to go from a BTC value to picoBTC implied by this SiPrefix.
 347         /// This is effectively 10^12 * the prefix multiplier
 348         pub fn multiplier(&self) -> u64 {
 349                 match *self {
 350                         SiPrefix::Milli => 1_000_000_000,
 351                         SiPrefix::Micro => 1_000_000,
 352                         SiPrefix::Nano => 1_000,
 353                         SiPrefix::Pico => 1,
 354                 }
 355         }
 356
 357         /// Returns all enum variants of `SiPrefix` sorted in descending order of their associated
 358         /// multiplier.
 359         ///
 360         /// (C-not exported) As we don't yet support a slice of enums, and also because this function
 361         /// isn't the most critical to expose.
 362         pub fn values_desc() -> &'static [SiPrefix] {
 363                 use crate::SiPrefix::*;
 364                 static VALUES: [SiPrefix; 4] = [Milli, Micro, Nano, Pico];
 365                 &VALUES
 366         }
 367 }
 368
 369 /// Enum representing the crypto currencies (or networks) supported by this library
 370 #[derive(Clone, Debug, Hash, Eq, PartialEq)]
 371 pub enum Currency {
 372         /// Bitcoin mainnet
 373         Bitcoin,
 374
 375         /// Bitcoin testnet
 376         BitcoinTestnet,
 377
 378         /// Bitcoin regtest
 379         Regtest,
 380
 381         /// Bitcoin simnet
 382         Simnet,
 383
 384         /// Bitcoin signet
 385         Signet,
 386 }
 387
 388 /// Tagged field which may have an unknown tag
 389 ///
 390 /// (C-not exported) as we don't currently support TaggedField
 391 #[derive(Clone, Debug, Hash, Eq, PartialEq)]
 392 pub enum RawTaggedField {
 393         /// Parsed tagged field with known tag
 394         KnownSemantics(TaggedField),
 395         /// tagged field which was not parsed due to an unknown tag or undefined field semantics
 396         UnknownSemantics(Vec<u5>),
 397 }
 398
 399 /// Tagged field with known tag
 400 ///
 401 /// For descriptions of the enum values please refer to the enclosed type's docs.
 402 ///
 403 /// (C-not exported) As we don't yet support enum variants with the same name the struct contained
 404 /// in the variant.
 405 #[allow(missing_docs)]
 406 #[derive(Clone, Debug, Hash, Eq, PartialEq)]
 407 pub enum TaggedField {
 408         PaymentHash(Sha256),
 409         Description(Description),
 410         PayeePubKey(PayeePubKey),
 411         DescriptionHash(Sha256),
 412         ExpiryTime(ExpiryTime),
 413         MinFinalCltvExpiry(MinFinalCltvExpiry),
 414         Fallback(Fallback),
 415         PrivateRoute(PrivateRoute),
 416         PaymentSecret(PaymentSecret),
 417         Features(InvoiceFeatures),
 418 }
 419
 420 /// SHA-256 hash
 421 #[derive(Clone, Debug, Hash, Eq, PartialEq)]
 422 pub struct Sha256(/// (C-not exported) as the native hash types are not currently mapped
 423         pub sha256::Hash);
 424
 425 /// Description string
 426 ///
 427 /// # Invariants
 428 /// The description can be at most 639 __bytes__ long
 429 #[derive(Clone, Debug, Hash, Eq, PartialEq)]
 430 pub struct Description(String);
 431
 432 /// Payee public key
 433 #[derive(Clone, Debug, Hash, Eq, PartialEq)]
 434 pub struct PayeePubKey(pub PublicKey);
 435
 436 /// Positive duration that defines when (relatively to the timestamp) in the future the invoice
 437 /// expires
 438 #[derive(Clone, Debug, Hash, Eq, PartialEq)]
 439 pub struct ExpiryTime(Duration);
 440
 441 /// `min_final_cltv_expiry` to use for the last HTLC in the route
 442 #[derive(Clone, Debug, Hash, Eq, PartialEq)]
 443 pub struct MinFinalCltvExpiry(pub u64);
 444
 445 // TODO: better types instead onf byte arrays
 446 /// Fallback address in case no LN payment is possible
 447 #[allow(missing_docs)]
 448 #[derive(Clone, Debug, Hash, Eq, PartialEq)]
 449 pub enum Fallback {
 450         SegWitProgram {
 451                 version: u5,
 452                 program: Vec<u8>,
 453         },
 454         PubKeyHash([u8; 20]),
 455         ScriptHash([u8; 20]),
 456 }
 457
 458 /// Recoverable signature
 459 #[derive(Clone, Debug, Hash, Eq, PartialEq)]
 460 pub struct InvoiceSignature(pub RecoverableSignature);
 461
 462 /// Private routing information
 463 ///
 464 /// # Invariants
 465 /// The encoded route has to be <1024 5bit characters long (<=639 bytes or <=12 hops)
 466 ///
 467 #[derive(Clone, Debug, Hash, Eq, PartialEq)]
 468 pub struct PrivateRoute(RouteHint);
 469
 470 /// Tag constants as specified in BOLT11
 471 #[allow(missing_docs)]
 472 pub mod constants {
 473         pub const TAG_PAYMENT_HASH: u8 = 1;
 474         pub const TAG_DESCRIPTION: u8 = 13;
 475         pub const TAG_PAYEE_PUB_KEY: u8 = 19;
 476         pub const TAG_DESCRIPTION_HASH: u8 = 23;
 477         pub const TAG_EXPIRY_TIME: u8 = 6;
 478         pub const TAG_MIN_FINAL_CLTV_EXPIRY: u8 = 24;
 479         pub const TAG_FALLBACK: u8 = 9;
 480         pub const TAG_PRIVATE_ROUTE: u8 = 3;
 481         pub const TAG_PAYMENT_SECRET: u8 = 16;
 482         pub const TAG_FEATURES: u8 = 5;
 483 }
 484
 485 impl InvoiceBuilder<tb::False, tb::False, tb::False, tb::False, tb::False> {
 486         /// Construct new, empty `InvoiceBuilder`. All necessary fields have to be filled first before
 487         /// `InvoiceBuilder::build(self)` becomes available.
 488         pub fn new(currrency: Currency) -> Self {
 489                 InvoiceBuilder {
 490                         currency: currrency,
 491                         amount: None,
 492                         si_prefix: None,
 493                         timestamp: None,
 494                         tagged_fields: Vec::new(),
 495                         error: None,
 496
 497                         phantom_d: core::marker::PhantomData,
 498                         phantom_h: core::marker::PhantomData,
 499                         phantom_t: core::marker::PhantomData,
 500                         phantom_c: core::marker::PhantomData,
 501                         phantom_s: core::marker::PhantomData,
 502                 }
 503         }
 504 }
 505
 506 impl<D: tb::Bool, H: tb::Bool, T: tb::Bool, C: tb::Bool, S: tb::Bool> InvoiceBuilder<D, H, T, C, S> {
 507         /// Helper function to set the completeness flags.
 508         fn set_flags<DN: tb::Bool, HN: tb::Bool, TN: tb::Bool, CN: tb::Bool, SN: tb::Bool>(self) -> InvoiceBuilder<DN, HN, TN, CN, SN> {
 509                 InvoiceBuilder::<DN, HN, TN, CN, SN> {
 510                         currency: self.currency,
 511                         amount: self.amount,
 512                         si_prefix: self.si_prefix,
 513                         timestamp: self.timestamp,
 514                         tagged_fields: self.tagged_fields,
 515                         error: self.error,
 516
 517                         phantom_d: core::marker::PhantomData,
 518                         phantom_h: core::marker::PhantomData,
 519                         phantom_t: core::marker::PhantomData,
 520                         phantom_c: core::marker::PhantomData,
 521                         phantom_s: core::marker::PhantomData,
 522                 }
 523         }
 524
 525         /// Sets the amount in millisatoshis. The optimal SI prefix is chosen automatically.
 526         pub fn amount_milli_satoshis(mut self, amount_msat: u64) -> Self {
 527                 let amount = amount_msat * 10; // Invoices are denominated in "pico BTC"
 528                 let biggest_possible_si_prefix = SiPrefix::values_desc()
 529                         .iter()
 530                         .find(|prefix| amount % prefix.multiplier() == 0)
 531                         .expect("Pico should always match");
 532                 self.amount = Some(amount / biggest_possible_si_prefix.multiplier());
 533                 self.si_prefix = Some(*biggest_possible_si_prefix);
 534                 self
 535         }
 536
 537         /// Sets the payee's public key.
 538         pub fn payee_pub_key(mut self, pub_key: PublicKey) -> Self {
 539                 self.tagged_fields.push(TaggedField::PayeePubKey(PayeePubKey(pub_key)));
 540                 self
 541         }
 542
 543         /// Sets the expiry time, dropping the subsecond part (which is not representable in BOLT 11
 544         /// invoices).
 545         pub fn expiry_time(mut self, expiry_time: Duration) -> Self {
 546                 self.tagged_fields.push(TaggedField::ExpiryTime(ExpiryTime::from_duration(expiry_time)));
 547                 self
 548         }
 549
 550         /// Adds a fallback address.
 551         pub fn fallback(mut self, fallback: Fallback) -> Self {
 552                 self.tagged_fields.push(TaggedField::Fallback(fallback));
 553                 self
 554         }
 555
 556         /// Adds a private route.
 557         pub fn private_route(mut self, hint: RouteHint) -> Self {
 558                 match PrivateRoute::new(hint) {
 559                         Ok(r) => self.tagged_fields.push(TaggedField::PrivateRoute(r)),
 560                         Err(e) => self.error = Some(e),
 561                 }
 562                 self
 563         }
 564 }
 565
 566 impl<D: tb::Bool, H: tb::Bool, C: tb::Bool, S: tb::Bool> InvoiceBuilder<D, H, tb::True, C, S> {
 567         /// Builds a `RawInvoice` if no `CreationError` occurred while construction any of the fields.
 568         pub fn build_raw(self) -> Result<RawInvoice, CreationError> {
 569
 570                 // If an error occurred at any time before, return it now
 571                 if let Some(e) = self.error {
 572                         return Err(e);
 573                 }
 574
 575                 let hrp = RawHrp {
 576                         currency: self.currency,
 577                         raw_amount: self.amount,
 578                         si_prefix: self.si_prefix,
 579                 };
 580
 581                 let timestamp = self.timestamp.expect("ensured to be Some(t) by type T");
 582
 583                 let tagged_fields = self.tagged_fields.into_iter().map(|tf| {
 584                         RawTaggedField::KnownSemantics(tf)
 585                 }).collect::<Vec<_>>();
 586
 587                 let data = RawDataPart {
 588                         timestamp: timestamp,
 589                         tagged_fields: tagged_fields,
 590                 };
 591
 592                 Ok(RawInvoice {
 593                         hrp: hrp,
 594                         data: data,
 595                 })
 596         }
 597 }
 598
 599 impl<H: tb::Bool, T: tb::Bool, C: tb::Bool, S: tb::Bool> InvoiceBuilder<tb::False, H, T, C, S> {
 600         /// Set the description. This function is only available if no description (hash) was set.
 601         pub fn description(mut self, description: String) -> InvoiceBuilder<tb::True, H, T, C, S> {
 602                 match Description::new(description) {
 603                         Ok(d) => self.tagged_fields.push(TaggedField::Description(d)),
 604                         Err(e) => self.error = Some(e),
 605                 }
 606                 self.set_flags()
 607         }
 608
 609         /// Set the description hash. This function is only available if no description (hash) was set.
 610         pub fn description_hash(mut self, description_hash: sha256::Hash) -> InvoiceBuilder<tb::True, H, T, C, S> {
 611                 self.tagged_fields.push(TaggedField::DescriptionHash(Sha256(description_hash)));
 612                 self.set_flags()
 613         }
 614 }
 615
 616 impl<D: tb::Bool, T: tb::Bool, C: tb::Bool, S: tb::Bool> InvoiceBuilder<D, tb::False, T, C, S> {
 617         /// Set the payment hash. This function is only available if no payment hash was set.
 618         pub fn payment_hash(mut self, hash: sha256::Hash) -> InvoiceBuilder<D, tb::True, T, C, S> {
 619                 self.tagged_fields.push(TaggedField::PaymentHash(Sha256(hash)));
 620                 self.set_flags()
 621         }
 622 }
 623
 624 impl<D: tb::Bool, H: tb::Bool, C: tb::Bool, S: tb::Bool> InvoiceBuilder<D, H, tb::False, C, S> {
 625         /// Sets the timestamp to a specific [`SystemTime`].
 626         #[cfg(feature = "std")]
 627         pub fn timestamp(mut self, time: SystemTime) -> InvoiceBuilder<D, H, tb::True, C, S> {
 628                 match PositiveTimestamp::from_system_time(time) {
 629                         Ok(t) => self.timestamp = Some(t),
 630                         Err(e) => self.error = Some(e),
 631                 }
 632
 633                 self.set_flags()
 634         }
 635
 636         /// Sets the timestamp to a duration since the Unix epoch, dropping the subsecond part (which
 637         /// is not representable in BOLT 11 invoices).
 638         pub fn duration_since_epoch(mut self, time: Duration) -> InvoiceBuilder<D, H, tb::True, C, S> {
 639                 match PositiveTimestamp::from_duration_since_epoch(time) {
 640                         Ok(t) => self.timestamp = Some(t),
 641                         Err(e) => self.error = Some(e),
 642                 }
 643
 644                 self.set_flags()
 645         }
 646
 647         /// Sets the timestamp to the current system time.
 648         #[cfg(feature = "std")]
 649         pub fn current_timestamp(mut self) -> InvoiceBuilder<D, H, tb::True, C, S> {
 650                 let now = PositiveTimestamp::from_system_time(SystemTime::now());
 651                 self.timestamp = Some(now.expect("for the foreseeable future this shouldn't happen"));
 652                 self.set_flags()
 653         }
 654 }
 655
 656 impl<D: tb::Bool, H: tb::Bool, T: tb::Bool, S: tb::Bool> InvoiceBuilder<D, H, T, tb::False, S> {
 657         /// Sets `min_final_cltv_expiry`.
 658         pub fn min_final_cltv_expiry(mut self, min_final_cltv_expiry: u64) -> InvoiceBuilder<D, H, T, tb::True, S> {
 659                 self.tagged_fields.push(TaggedField::MinFinalCltvExpiry(MinFinalCltvExpiry(min_final_cltv_expiry)));
 660                 self.set_flags()
 661         }
 662 }
 663
 664 impl<D: tb::Bool, H: tb::Bool, T: tb::Bool, C: tb::Bool> InvoiceBuilder<D, H, T, C, tb::False> {
 665         /// Sets the payment secret and relevant features.
 666         pub fn payment_secret(mut self, payment_secret: PaymentSecret) -> InvoiceBuilder<D, H, T, C, tb::True> {
 667                 let mut features = InvoiceFeatures::empty();
 668                 features.set_variable_length_onion_required();
 669                 features.set_payment_secret_required();
 670                 self.tagged_fields.push(TaggedField::PaymentSecret(payment_secret));
 671                 self.tagged_fields.push(TaggedField::Features(features));
 672                 self.set_flags()
 673         }
 674 }
 675
 676 impl<D: tb::Bool, H: tb::Bool, T: tb::Bool, C: tb::Bool> InvoiceBuilder<D, H, T, C, tb::True> {
 677         /// Sets the `basic_mpp` feature as optional.
 678         pub fn basic_mpp(mut self) -> Self {
 679                 for field in self.tagged_fields.iter_mut() {
 680                         if let TaggedField::Features(f) = field {
 681                                 f.set_basic_mpp_optional();
 682                         }
 683                 }
 684                 self
 685         }
 686 }
 687
 688 impl InvoiceBuilder<tb::True, tb::True, tb::True, tb::True, tb::True> {
 689         /// Builds and signs an invoice using the supplied `sign_function`. This function MAY NOT fail
 690         /// and MUST produce a recoverable signature valid for the given hash and if applicable also for
 691         /// the included payee public key.
 692         pub fn build_signed<F>(self, sign_function: F) -> Result<Invoice, CreationError>
 693                 where F: FnOnce(&Message) -> RecoverableSignature
 694         {
 695                 let invoice = self.try_build_signed::<_, ()>(|hash| {
 696                         Ok(sign_function(hash))
 697                 });
 698
 699                 match invoice {
 700                         Ok(i) => Ok(i),
 701                         Err(SignOrCreationError::CreationError(e)) => Err(e),
 702                         Err(SignOrCreationError::SignError(())) => unreachable!(),
 703                 }
 704         }
 705
 706         /// Builds and signs an invoice using the supplied `sign_function`. This function MAY fail with
 707         /// an error of type `E` and MUST produce a recoverable signature valid for the given hash and
 708         /// if applicable also for the included payee public key.
 709         pub fn try_build_signed<F, E>(self, sign_function: F) -> Result<Invoice, SignOrCreationError<E>>
 710                 where F: FnOnce(&Message) -> Result<RecoverableSignature, E>
 711         {
 712                 let raw = match self.build_raw() {
 713                         Ok(r) => r,
 714                         Err(e) => return Err(SignOrCreationError::CreationError(e)),
 715                 };
 716
 717                 let signed = match raw.sign(sign_function) {
 718                         Ok(s) => s,
 719                         Err(e) => return Err(SignOrCreationError::SignError(e)),
 720                 };
 721
 722                 let invoice = Invoice {
 723                         signed_invoice: signed,
 724                 };
 725
 726                 invoice.check_field_counts().expect("should be ensured by type signature of builder");
 727                 invoice.check_feature_bits().expect("should be ensured by type signature of builder");
 728                 invoice.check_amount().expect("should be ensured by type signature of builder");
 729
 730                 Ok(invoice)
 731         }
 732 }
 733
 734
 735 impl SignedRawInvoice {
 736         /// Disassembles the `SignedRawInvoice` into its three parts:
 737         ///  1. raw invoice
 738         ///  2. hash of the raw invoice
 739         ///  3. signature
 740         pub fn into_parts(self) -> (RawInvoice, [u8; 32], InvoiceSignature) {
 741                 (self.raw_invoice, self.hash, self.signature)
 742         }
 743
 744         /// The `RawInvoice` which was signed.
 745         pub fn raw_invoice(&self) -> &RawInvoice {
 746                 &self.raw_invoice
 747         }
 748
 749         /// The hash of the `RawInvoice` that was signed.
 750         pub fn signable_hash(&self) -> &[u8; 32] {
 751                 &self.hash
 752         }
 753
 754         /// InvoiceSignature for the invoice.
 755         pub fn signature(&self) -> &InvoiceSignature {
 756                 &self.signature
 757         }
 758
 759         /// Recovers the public key used for signing the invoice from the recoverable signature.
 760         pub fn recover_payee_pub_key(&self) -> Result<PayeePubKey, secp256k1::Error> {
 761                 let hash = Message::from_slice(&self.hash[..])
 762                         .expect("Hash is 32 bytes long, same as MESSAGE_SIZE");
 763
 764                 Ok(PayeePubKey(Secp256k1::new().recover_ecdsa(
 765                         &hash,
 766                         &self.signature
 767                 )?))
 768         }
 769
 770         /// Checks if the signature is valid for the included payee public key or if none exists if it's
 771         /// valid for the recovered signature (which should always be true?).
 772         pub fn check_signature(&self) -> bool {
 773                 let included_pub_key = self.raw_invoice.payee_pub_key();
 774
 775                 let mut recovered_pub_key = Option::None;
 776                 if recovered_pub_key.is_none() {
 777                         let recovered = match self.recover_payee_pub_key() {
 778                                 Ok(pk) => pk,
 779                                 Err(_) => return false,
 780                         };
 781                         recovered_pub_key = Some(recovered);
 782                 }
 783
 784                 let pub_key = included_pub_key.or_else(|| recovered_pub_key.as_ref())
 785                         .expect("One is always present");
 786
 787                 let hash = Message::from_slice(&self.hash[..])
 788                         .expect("Hash is 32 bytes long, same as MESSAGE_SIZE");
 789
 790                 let secp_context = Secp256k1::new();
 791                 let verification_result = secp_context.verify_ecdsa(
 792                         &hash,
 793                         &self.signature.to_standard(),
 794                         pub_key
 795                 );
 796
 797                 match verification_result {
 798                         Ok(()) => true,
 799                         Err(_) => false,
 800                 }
 801         }
 802 }
 803
 804 /// Finds the first element of an enum stream of a given variant and extracts one member of the
 805 /// variant. If no element was found `None` gets returned.
 806 ///
 807 /// The following example would extract the first B.
 808 ///
 809 /// ```ignore
 810 /// enum Enum {
 811 ///     A(u8),
 812 ///     B(u16)
 813 /// }
 814 ///
 815 /// let elements = vec![Enum::A(1), Enum::A(2), Enum::B(3), Enum::A(4)];
 816 ///
 817 /// assert_eq!(find_extract!(elements.iter(), Enum::B(x), x), Some(3u16));
 818 /// ```
 819 macro_rules! find_extract {
 820         ($iter:expr, $enm:pat, $enm_var:ident) => {
 821                 find_all_extract!($iter, $enm, $enm_var).next()
 822         };
 823 }
 824
 825 /// Finds the all elements of an enum stream of a given variant and extracts one member of the
 826 /// variant through an iterator.
 827 ///
 828 /// The following example would extract all A.
 829 ///
 830 /// ```ignore
 831 /// enum Enum {
 832 ///     A(u8),
 833 ///     B(u16)
 834 /// }
 835 ///
 836 /// let elements = vec![Enum::A(1), Enum::A(2), Enum::B(3), Enum::A(4)];
 837 ///
 838 /// assert_eq!(
 839 ///     find_all_extract!(elements.iter(), Enum::A(x), x).collect::<Vec<u8>>(),
 840 ///     vec![1u8, 2u8, 4u8]
 841 /// );
 842 /// ```
 843 macro_rules! find_all_extract {
 844         ($iter:expr, $enm:pat, $enm_var:ident) => {
 845                 $iter.filter_map(|tf| match *tf {
 846                         $enm => Some($enm_var),
 847                         _ => None,
 848                 })
 849         };
 850 }
 851
 852 #[allow(missing_docs)]
 853 impl RawInvoice {
 854         /// Hash the HRP as bytes and signatureless data part.
 855         fn hash_from_parts(hrp_bytes: &[u8], data_without_signature: &[u5]) -> [u8; 32] {
 856                 let preimage = construct_invoice_preimage(hrp_bytes, data_without_signature);
 857                 let mut hash: [u8; 32] = Default::default();
 858                 hash.copy_from_slice(&sha256::Hash::hash(&preimage)[..]);
 859                 hash
 860         }
 861
 862         /// Calculate the hash of the encoded `RawInvoice` which should be signed.
 863         pub fn signable_hash(&self) -> [u8; 32] {
 864                 use bech32::ToBase32;
 865
 866                 RawInvoice::hash_from_parts(
 867                         self.hrp.to_string().as_bytes(),
 868                         &self.data.to_base32()
 869                 )
 870         }
 871
 872         /// Signs the invoice using the supplied `sign_function`. This function MAY fail with an error
 873         /// of type `E`. Since the signature of a `SignedRawInvoice` is not required to be valid there
 874         /// are no constraints regarding the validity of the produced signature.
 875         ///
 876         /// (C-not exported) As we don't currently support passing function pointers into methods
 877         /// explicitly.
 878         pub fn sign<F, E>(self, sign_method: F) -> Result<SignedRawInvoice, E>
 879                 where F: FnOnce(&Message) -> Result<RecoverableSignature, E>
 880         {
 881                 let raw_hash = self.signable_hash();
 882                 let hash = Message::from_slice(&raw_hash[..])
 883                         .expect("Hash is 32 bytes long, same as MESSAGE_SIZE");
 884                 let signature = sign_method(&hash)?;
 885
 886                 Ok(SignedRawInvoice {
 887                         raw_invoice: self,
 888                         hash: raw_hash,
 889                         signature: InvoiceSignature(signature),
 890                 })
 891         }
 892
 893         /// Returns an iterator over all tagged fields with known semantics.
 894         ///
 895         /// (C-not exported) As there is not yet a manual mapping for a FilterMap
 896         pub fn known_tagged_fields(&self)
 897                 -> FilterMap<Iter<RawTaggedField>, fn(&RawTaggedField) -> Option<&TaggedField>>
 898         {
 899                 // For 1.14.0 compatibility: closures' types can't be written an fn()->() in the
 900                 // function's type signature.
 901                 // TODO: refactor once impl Trait is available
 902                 fn match_raw(raw: &RawTaggedField) -> Option<&TaggedField> {
 903                         match *raw {
 904                                 RawTaggedField::KnownSemantics(ref tf) => Some(tf),
 905                                 _ => None,
 906                         }
 907                 }
 908
 909                 self.data.tagged_fields.iter().filter_map(match_raw )
 910         }
 911
 912         pub fn payment_hash(&self) -> Option<&Sha256> {
 913                 find_extract!(self.known_tagged_fields(), TaggedField::PaymentHash(ref x), x)
 914         }
 915
 916         pub fn description(&self) -> Option<&Description> {
 917                 find_extract!(self.known_tagged_fields(), TaggedField::Description(ref x), x)
 918         }
 919
 920         pub fn payee_pub_key(&self) -> Option<&PayeePubKey> {
 921                 find_extract!(self.known_tagged_fields(), TaggedField::PayeePubKey(ref x), x)
 922         }
 923
 924         pub fn description_hash(&self) -> Option<&Sha256> {
 925                 find_extract!(self.known_tagged_fields(), TaggedField::DescriptionHash(ref x), x)
 926         }
 927
 928         pub fn expiry_time(&self) -> Option<&ExpiryTime> {
 929                 find_extract!(self.known_tagged_fields(), TaggedField::ExpiryTime(ref x), x)
 930         }
 931
 932         pub fn min_final_cltv_expiry(&self) -> Option<&MinFinalCltvExpiry> {
 933                 find_extract!(self.known_tagged_fields(), TaggedField::MinFinalCltvExpiry(ref x), x)
 934         }
 935
 936         pub fn payment_secret(&self) -> Option<&PaymentSecret> {
 937                 find_extract!(self.known_tagged_fields(), TaggedField::PaymentSecret(ref x), x)
 938         }
 939
 940         pub fn features(&self) -> Option<&InvoiceFeatures> {
 941                 find_extract!(self.known_tagged_fields(), TaggedField::Features(ref x), x)
 942         }
 943
 944         /// (C-not exported) as we don't support Vec<&NonOpaqueType>
 945         pub fn fallbacks(&self) -> Vec<&Fallback> {
 946                 find_all_extract!(self.known_tagged_fields(), TaggedField::Fallback(ref x), x).collect()
 947         }
 948
 949         pub fn private_routes(&self) -> Vec<&PrivateRoute> {
 950                 find_all_extract!(self.known_tagged_fields(), TaggedField::PrivateRoute(ref x), x).collect()
 951         }
 952
 953         pub fn amount_pico_btc(&self) -> Option<u64> {
 954                 self.hrp.raw_amount.map(|v| {
 955                         v * self.hrp.si_prefix.as_ref().map_or(1_000_000_000_000, |si| { si.multiplier() })
 956                 })
 957         }
 958
 959         pub fn currency(&self) -> Currency {
 960                 self.hrp.currency.clone()
 961         }
 962 }
 963
 964 impl PositiveTimestamp {
 965         /// Creates a `PositiveTimestamp` from a Unix timestamp in the range `0..=MAX_TIMESTAMP`.
 966         ///
 967         /// Otherwise, returns a [`CreationError::TimestampOutOfBounds`].
 968         pub fn from_unix_timestamp(unix_seconds: u64) -> Result<Self, CreationError> {
 969                 if unix_seconds <= MAX_TIMESTAMP {
 970                         Ok(Self(Duration::from_secs(unix_seconds)))
 971                 } else {
 972                         Err(CreationError::TimestampOutOfBounds)
 973                 }
 974         }
 975
 976         /// Creates a `PositiveTimestamp` from a [`SystemTime`] with a corresponding Unix timestamp in
 977         /// the range `0..=MAX_TIMESTAMP`.
 978         ///
 979         /// Note that the subsecond part is dropped as it is not representable in BOLT 11 invoices.
 980         ///
 981         /// Otherwise, returns a [`CreationError::TimestampOutOfBounds`].
 982         #[cfg(feature = "std")]
 983         pub fn from_system_time(time: SystemTime) -> Result<Self, CreationError> {
 984                 time.duration_since(SystemTime::UNIX_EPOCH)
 985                         .map(Self::from_duration_since_epoch)
 986                         .unwrap_or(Err(CreationError::TimestampOutOfBounds))
 987         }
 988
 989         /// Creates a `PositiveTimestamp` from a [`Duration`] since the Unix epoch in the range
 990         /// `0..=MAX_TIMESTAMP`.
 991         ///
 992         /// Note that the subsecond part is dropped as it is not representable in BOLT 11 invoices.
 993         ///
 994         /// Otherwise, returns a [`CreationError::TimestampOutOfBounds`].
 995         pub fn from_duration_since_epoch(duration: Duration) -> Result<Self, CreationError> {
 996                 Self::from_unix_timestamp(duration.as_secs())
 997         }
 998
 999         /// Returns the Unix timestamp representing the stored time
1000         pub fn as_unix_timestamp(&self) -> u64 {
1001                 self.0.as_secs()
1002         }
1003
1004         /// Returns the duration of the stored time since the Unix epoch
1005         pub fn as_duration_since_epoch(&self) -> Duration {
1006                 self.0
1007         }
1008
1009         /// Returns the [`SystemTime`] representing the stored time
1010         #[cfg(feature = "std")]
1011         pub fn as_time(&self) -> SystemTime {
1012                 SystemTime::UNIX_EPOCH + self.0
1013         }
1014 }
1015
1016 #[cfg(feature = "std")]
1017 impl Into<SystemTime> for PositiveTimestamp {
1018         fn into(self) -> SystemTime {
1019                 SystemTime::UNIX_EPOCH + self.0
1020         }
1021 }
1022
1023 impl Invoice {
1024         /// Transform the `Invoice` into it's unchecked version
1025         pub fn into_signed_raw(self) -> SignedRawInvoice {
1026                 self.signed_invoice
1027         }
1028
1029         /// Check that all mandatory fields are present
1030         fn check_field_counts(&self) -> Result<(), SemanticError> {
1031                 // "A writer MUST include exactly one p field […]."
1032                 let payment_hash_cnt = self.tagged_fields().filter(|&tf| match *tf {
1033                         TaggedField::PaymentHash(_) => true,
1034                         _ => false,
1035                 }).count();
1036                 if payment_hash_cnt < 1 {
1037                         return Err(SemanticError::NoPaymentHash);
1038                 } else if payment_hash_cnt > 1 {
1039                         return Err(SemanticError::MultiplePaymentHashes);
1040                 }
1041
1042                 // "A writer MUST include either exactly one d or exactly one h field."
1043                 let description_cnt = self.tagged_fields().filter(|&tf| match *tf {
1044                         TaggedField::Description(_) | TaggedField::DescriptionHash(_) => true,
1045                         _ => false,
1046                 }).count();
1047                 if  description_cnt < 1 {
1048                         return Err(SemanticError::NoDescription);
1049                 } else if description_cnt > 1 {
1050                         return  Err(SemanticError::MultipleDescriptions);
1051                 }
1052
1053                 self.check_payment_secret()?;
1054
1055                 Ok(())
1056         }
1057
1058         /// Checks that there is exactly one payment secret field
1059         fn check_payment_secret(&self) -> Result<(), SemanticError> {
1060                 // "A writer MUST include exactly one `s` field."
1061                 let payment_secret_count = self.tagged_fields().filter(|&tf| match *tf {
1062                         TaggedField::PaymentSecret(_) => true,
1063                         _ => false,
1064                 }).count();
1065                 if payment_secret_count < 1 {
1066                         return Err(SemanticError::NoPaymentSecret);
1067                 } else if payment_secret_count > 1 {
1068                         return Err(SemanticError::MultiplePaymentSecrets);
1069                 }
1070
1071                 Ok(())
1072         }
1073
1074         /// Check that amount is a whole number of millisatoshis
1075         fn check_amount(&self) -> Result<(), SemanticError> {
1076                 if let Some(amount_pico_btc) = self.amount_pico_btc() {
1077                         if amount_pico_btc % 10 != 0 {
1078                                 return Err(SemanticError::ImpreciseAmount);
1079                         }
1080                 }
1081                 Ok(())
1082         }
1083
1084         /// Check that feature bits are set as required
1085         fn check_feature_bits(&self) -> Result<(), SemanticError> {
1086                 self.check_payment_secret()?;
1087
1088                 // "A writer MUST set an s field if and only if the payment_secret feature is set."
1089                 // (this requirement has been since removed, and we now require the payment secret
1090                 // feature bit always).
1091                 let features = self.tagged_fields().find(|&tf| match *tf {
1092                         TaggedField::Features(_) => true,
1093                         _ => false,
1094                 });
1095                 match features {
1096                         None => Err(SemanticError::InvalidFeatures),
1097                         Some(TaggedField::Features(features)) => {
1098                                 if features.requires_unknown_bits() {
1099                                         Err(SemanticError::InvalidFeatures)
1100                                 } else if !features.supports_payment_secret() {
1101                                         Err(SemanticError::InvalidFeatures)
1102                                 } else {
1103                                         Ok(())
1104                                 }
1105                         },
1106                         Some(_) => unreachable!(),
1107                 }
1108         }
1109
1110         /// Check that the invoice is signed correctly and that key recovery works
1111         pub fn check_signature(&self) -> Result<(), SemanticError> {
1112                 match self.signed_invoice.recover_payee_pub_key() {
1113                         Err(secp256k1::Error::InvalidRecoveryId) =>
1114                                 return Err(SemanticError::InvalidRecoveryId),
1115                         Err(secp256k1::Error::InvalidSignature) =>
1116                                 return Err(SemanticError::InvalidSignature),
1117                         Err(e) => panic!("no other error may occur, got {:?}", e),
1118                         Ok(_) => {},
1119                 }
1120
1121                 if !self.signed_invoice.check_signature() {
1122                         return Err(SemanticError::InvalidSignature);
1123                 }
1124
1125                 Ok(())
1126         }
1127
1128         /// Constructs an `Invoice` from a `SignedRawInvoice` by checking all its invariants.
1129         /// ```
1130         /// use lightning_invoice::*;
1131         ///
1132         /// let invoice = "lnbc100p1psj9jhxdqud3jxktt5w46x7unfv9kz6mn0v3jsnp4q0d3p2sfluzdx45tqcs\
1133         /// h2pu5qc7lgq0xs578ngs6s0s68ua4h7cvspp5q6rmq35js88zp5dvwrv9m459tnk2zunwj5jalqtyxqulh0l\
1134         /// 5gflssp5nf55ny5gcrfl30xuhzj3nphgj27rstekmr9fw3ny5989s300gyus9qyysgqcqpcrzjqw2sxwe993\
1135         /// h5pcm4dxzpvttgza8zhkqxpgffcrf5v25nwpr3cmfg7z54kuqq8rgqqqqqqqq2qqqqq9qq9qrzjqd0ylaqcl\
1136         /// j9424x9m8h2vcukcgnm6s56xfgu3j78zyqzhgs4hlpzvznlugqq9vsqqqqqqqlgqqqqqeqq9qrzjqwldmj9d\
1137         /// ha74df76zhx6l9we0vjdquygcdt3kssupehe64g6yyp5yz5rhuqqwccqqyqqqqlgqqqqjcqq9qrzjqf9e58a\
1138         /// guqr0rcun0ajlvmzq3ek63cw2w282gv3z5uupmuwvgjtq2z55qsqqg6qqqyqqqrtnqqqzq3cqygrzjqvphms\
1139         /// ywntrrhqjcraumvc4y6r8v4z5v593trte429v4hredj7ms5z52usqq9ngqqqqqqqlgqqqqqqgq9qrzjq2v0v\
1140         /// p62g49p7569ev48cmulecsxe59lvaw3wlxm7r982zxa9zzj7z5l0cqqxusqqyqqqqlgqqqqqzsqygarl9fh3\
1141         /// 8s0gyuxjjgux34w75dnc6xp2l35j7es3jd4ugt3lu0xzre26yg5m7ke54n2d5sym4xcmxtl8238xxvw5h5h5\
1142         /// j5r6drg6k6zcqj0fcwg";
1143         ///
1144         /// let signed = invoice.parse::<SignedRawInvoice>().unwrap();
1145         ///
1146         /// assert!(Invoice::from_signed(signed).is_ok());
1147         /// ```
1148         pub fn from_signed(signed_invoice: SignedRawInvoice) -> Result<Self, SemanticError> {
1149                 let invoice = Invoice {
1150                         signed_invoice: signed_invoice,
1151                 };
1152                 invoice.check_field_counts()?;
1153                 invoice.check_feature_bits()?;
1154                 invoice.check_signature()?;
1155                 invoice.check_amount()?;
1156
1157                 Ok(invoice)
1158         }
1159
1160         /// Returns the `Invoice`'s timestamp (should equal its creation time)
1161         #[cfg(feature = "std")]
1162         pub fn timestamp(&self) -> SystemTime {
1163                 self.signed_invoice.raw_invoice().data.timestamp.as_time()
1164         }
1165
1166         /// Returns the `Invoice`'s timestamp as a duration since the Unix epoch
1167         pub fn duration_since_epoch(&self) -> Duration {
1168                 self.signed_invoice.raw_invoice().data.timestamp.0
1169         }
1170
1171         /// Returns an iterator over all tagged fields of this Invoice.
1172         ///
1173         /// (C-not exported) As there is not yet a manual mapping for a FilterMap
1174         pub fn tagged_fields(&self)
1175                 -> FilterMap<Iter<RawTaggedField>, fn(&RawTaggedField) -> Option<&TaggedField>> {
1176                 self.signed_invoice.raw_invoice().known_tagged_fields()
1177         }
1178
1179         /// Returns the hash to which we will receive the preimage on completion of the payment
1180         pub fn payment_hash(&self) -> &sha256::Hash {
1181                 &self.signed_invoice.payment_hash().expect("checked by constructor").0
1182         }
1183
1184         /// Return the description or a hash of it for longer ones
1185         ///
1186         /// (C-not exported) because we don't yet export InvoiceDescription
1187         pub fn description(&self) -> InvoiceDescription {
1188                 if let Some(ref direct) = self.signed_invoice.description() {
1189                         return InvoiceDescription::Direct(direct);
1190                 } else if let Some(ref hash) = self.signed_invoice.description_hash() {
1191                         return InvoiceDescription::Hash(hash);
1192                 }
1193                 unreachable!("ensured by constructor");
1194         }
1195
1196         /// Get the payee's public key if one was included in the invoice
1197         pub fn payee_pub_key(&self) -> Option<&PublicKey> {
1198                 self.signed_invoice.payee_pub_key().map(|x| &x.0)
1199         }
1200
1201         /// Get the payment secret if one was included in the invoice
1202         pub fn payment_secret(&self) -> &PaymentSecret {
1203                 self.signed_invoice.payment_secret().expect("was checked by constructor")
1204         }
1205
1206         /// Get the invoice features if they were included in the invoice
1207         pub fn features(&self) -> Option<&InvoiceFeatures> {
1208                 self.signed_invoice.features()
1209         }
1210
1211         /// Recover the payee's public key (only to be used if none was included in the invoice)
1212         pub fn recover_payee_pub_key(&self) -> PublicKey {
1213                 self.signed_invoice.recover_payee_pub_key().expect("was checked by constructor").0
1214         }
1215
1216         /// Returns the invoice's expiry time, if present, otherwise [`DEFAULT_EXPIRY_TIME`].
1217         pub fn expiry_time(&self) -> Duration {
1218                 self.signed_invoice.expiry_time()
1219                         .map(|x| x.0)
1220                         .unwrap_or(Duration::from_secs(DEFAULT_EXPIRY_TIME))
1221         }
1222
1223         /// Returns whether the invoice has expired.
1224         #[cfg(feature = "std")]
1225         pub fn is_expired(&self) -> bool {
1226                 Self::is_expired_from_epoch(&self.timestamp(), self.expiry_time())
1227         }
1228
1229         /// Returns whether the expiry time from the given epoch has passed.
1230         #[cfg(feature = "std")]
1231         pub(crate) fn is_expired_from_epoch(epoch: &SystemTime, expiry_time: Duration) -> bool {
1232                 match epoch.elapsed() {
1233                         Ok(elapsed) => elapsed > expiry_time,
1234                         Err(_) => false,
1235                 }
1236         }
1237
1238         /// Returns whether the expiry time would pass at the given point in time.
1239         /// `at_time` is the timestamp as a duration since the Unix epoch.
1240         pub fn would_expire(&self, at_time: Duration) -> bool {
1241                 self.duration_since_epoch()
1242                         .checked_add(self.expiry_time())
1243                         .unwrap_or_else(|| Duration::new(u64::max_value(), 1_000_000_000 - 1)) < at_time
1244         }
1245
1246         /// Returns the invoice's `min_final_cltv_expiry` time, if present, otherwise
1247         /// [`DEFAULT_MIN_FINAL_CLTV_EXPIRY`].
1248         pub fn min_final_cltv_expiry(&self) -> u64 {
1249                 self.signed_invoice.min_final_cltv_expiry()
1250                         .map(|x| x.0)
1251                         .unwrap_or(DEFAULT_MIN_FINAL_CLTV_EXPIRY)
1252         }
1253
1254         /// Returns a list of all fallback addresses
1255         ///
1256         /// (C-not exported) as we don't support Vec<&NonOpaqueType>
1257         pub fn fallbacks(&self) -> Vec<&Fallback> {
1258                 self.signed_invoice.fallbacks()
1259         }
1260
1261         /// Returns a list of all routes included in the invoice
1262         pub fn private_routes(&self) -> Vec<&PrivateRoute> {
1263                 self.signed_invoice.private_routes()
1264         }
1265
1266         /// Returns a list of all routes included in the invoice as the underlying hints
1267         pub fn route_hints(&self) -> Vec<RouteHint> {
1268                 find_all_extract!(
1269                         self.signed_invoice.known_tagged_fields(), TaggedField::PrivateRoute(ref x), x
1270                 ).map(|route| (**route).clone()).collect()
1271         }
1272
1273         /// Returns the currency for which the invoice was issued
1274         pub fn currency(&self) -> Currency {
1275                 self.signed_invoice.currency()
1276         }
1277
1278         /// Returns the amount if specified in the invoice as millisatoshis.
1279         pub fn amount_milli_satoshis(&self) -> Option<u64> {
1280                 self.signed_invoice.amount_pico_btc().map(|v| v / 10)
1281         }
1282
1283         /// Returns the amount if specified in the invoice as pico BTC.
1284         fn amount_pico_btc(&self) -> Option<u64> {
1285                 self.signed_invoice.amount_pico_btc()
1286         }
1287 }
1288
1289 impl From<TaggedField> for RawTaggedField {
1290         fn from(tf: TaggedField) -> Self {
1291                 RawTaggedField::KnownSemantics(tf)
1292         }
1293 }
1294
1295 impl TaggedField {
1296         /// Numeric representation of the field's tag
1297         pub fn tag(&self) -> u5 {
1298                 let tag = match *self {
1299                         TaggedField::PaymentHash(_) => constants::TAG_PAYMENT_HASH,
1300                         TaggedField::Description(_) => constants::TAG_DESCRIPTION,
1301                         TaggedField::PayeePubKey(_) => constants::TAG_PAYEE_PUB_KEY,
1302                         TaggedField::DescriptionHash(_) => constants::TAG_DESCRIPTION_HASH,
1303                         TaggedField::ExpiryTime(_) => constants::TAG_EXPIRY_TIME,
1304                         TaggedField::MinFinalCltvExpiry(_) => constants::TAG_MIN_FINAL_CLTV_EXPIRY,
1305                         TaggedField::Fallback(_) => constants::TAG_FALLBACK,
1306                         TaggedField::PrivateRoute(_) => constants::TAG_PRIVATE_ROUTE,
1307                         TaggedField::PaymentSecret(_) => constants::TAG_PAYMENT_SECRET,
1308                         TaggedField::Features(_) => constants::TAG_FEATURES,
1309                 };
1310
1311                 u5::try_from_u8(tag).expect("all tags defined are <32")
1312         }
1313 }
1314
1315 impl Description {
1316
1317         /// Creates a new `Description` if `description` is at most 1023 __bytes__ long,
1318         /// returns `CreationError::DescriptionTooLong` otherwise
1319         ///
1320         /// Please note that single characters may use more than one byte due to UTF8 encoding.
1321         pub fn new(description: String) -> Result<Description, CreationError> {
1322                 if description.len() > 639 {
1323                         Err(CreationError::DescriptionTooLong)
1324                 } else {
1325                         Ok(Description(description))
1326                 }
1327         }
1328
1329         /// Returns the underlying description `String`
1330         pub fn into_inner(self) -> String {
1331                 self.0
1332         }
1333 }
1334
1335 impl Into<String> for Description {
1336         fn into(self) -> String {
1337                 self.into_inner()
1338         }
1339 }
1340
1341 impl Deref for Description {
1342         type Target = str;
1343
1344         fn deref(&self) -> &str {
1345                 &self.0
1346         }
1347 }
1348
1349 impl From<PublicKey> for PayeePubKey {
1350         fn from(pk: PublicKey) -> Self {
1351                 PayeePubKey(pk)
1352         }
1353 }
1354
1355 impl Deref for PayeePubKey {
1356         type Target = PublicKey;
1357
1358         fn deref(&self) -> &PublicKey {
1359                 &self.0
1360         }
1361 }
1362
1363 impl ExpiryTime {
1364         /// Construct an `ExpiryTime` from seconds.
1365         pub fn from_seconds(seconds: u64) -> ExpiryTime {
1366                 ExpiryTime(Duration::from_secs(seconds))
1367         }
1368
1369         /// Construct an `ExpiryTime` from a `Duration`, dropping the sub-second part.
1370         pub fn from_duration(duration: Duration) -> ExpiryTime {
1371                 Self::from_seconds(duration.as_secs())
1372         }
1373
1374         /// Returns the expiry time in seconds
1375         pub fn as_seconds(&self) -> u64 {
1376                 self.0.as_secs()
1377         }
1378
1379         /// Returns a reference to the underlying `Duration` (=expiry time)
1380         pub fn as_duration(&self) -> &Duration {
1381                 &self.0
1382         }
1383 }
1384
1385 impl PrivateRoute {
1386         /// Creates a new (partial) route from a list of hops
1387         pub fn new(hops: RouteHint) -> Result<PrivateRoute, CreationError> {
1388                 if hops.0.len() <= 12 {
1389                         Ok(PrivateRoute(hops))
1390                 } else {
1391                         Err(CreationError::RouteTooLong)
1392                 }
1393         }
1394
1395         /// Returns the underlying list of hops
1396         pub fn into_inner(self) -> RouteHint {
1397                 self.0
1398         }
1399 }
1400
1401 impl Into<RouteHint> for PrivateRoute {
1402         fn into(self) -> RouteHint {
1403                 self.into_inner()
1404         }
1405 }
1406
1407 impl Deref for PrivateRoute {
1408         type Target = RouteHint;
1409
1410         fn deref(&self) -> &RouteHint {
1411                 &self.0
1412         }
1413 }
1414
1415 impl Deref for InvoiceSignature {
1416         type Target = RecoverableSignature;
1417
1418         fn deref(&self) -> &RecoverableSignature {
1419                 &self.0
1420         }
1421 }
1422
1423 impl Deref for SignedRawInvoice {
1424         type Target = RawInvoice;
1425
1426         fn deref(&self) -> &RawInvoice {
1427                 &self.raw_invoice
1428         }
1429 }
1430
1431 /// Errors that may occur when constructing a new `RawInvoice` or `Invoice`
1432 #[derive(Eq, PartialEq, Debug, Clone)]
1433 pub enum CreationError {
1434         /// The supplied description string was longer than 639 __bytes__ (see [`Description::new(…)`](./struct.Description.html#method.new))
1435         DescriptionTooLong,
1436
1437         /// The specified route has too many hops and can't be encoded
1438         RouteTooLong,
1439
1440         /// The Unix timestamp of the supplied date is less than zero or greater than 35-bits
1441         TimestampOutOfBounds,
1442
1443         /// The supplied millisatoshi amount was greater than the total bitcoin supply.
1444         InvalidAmount,
1445
1446         /// Route hints were required for this invoice and were missing. Applies to
1447         /// [phantom invoices].
1448         ///
1449         /// [phantom invoices]: crate::utils::create_phantom_invoice
1450         MissingRouteHints,
1451 }
1452
1453 impl Display for CreationError {
1454         fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
1455                 match self {
1456                         CreationError::DescriptionTooLong => f.write_str("The supplied description string was longer than 639 bytes"),
1457                         CreationError::RouteTooLong => f.write_str("The specified route has too many hops and can't be encoded"),
1458                         CreationError::TimestampOutOfBounds => f.write_str("The Unix timestamp of the supplied date is less than zero or greater than 35-bits"),
1459                         CreationError::InvalidAmount => f.write_str("The supplied millisatoshi amount was greater than the total bitcoin supply"),
1460                         CreationError::MissingRouteHints => f.write_str("The invoice required route hints and they weren't provided"),
1461                 }
1462         }
1463 }
1464
1465 #[cfg(feature = "std")]
1466 impl std::error::Error for CreationError { }
1467
1468 /// Errors that may occur when converting a `RawInvoice` to an `Invoice`. They relate to the
1469 /// requirements sections in BOLT #11
1470 #[derive(Eq, PartialEq, Debug, Clone)]
1471 pub enum SemanticError {
1472         /// The invoice is missing the mandatory payment hash
1473         NoPaymentHash,
1474
1475         /// The invoice has multiple payment hashes which isn't allowed
1476         MultiplePaymentHashes,
1477
1478         /// No description or description hash are part of the invoice
1479         NoDescription,
1480
1481         /// The invoice contains multiple descriptions and/or description hashes which isn't allowed
1482         MultipleDescriptions,
1483
1484         /// The invoice is missing the mandatory payment secret, which all modern lightning nodes
1485         /// should provide.
1486         NoPaymentSecret,
1487
1488         /// The invoice contains multiple payment secrets
1489         MultiplePaymentSecrets,
1490
1491         /// The invoice's features are invalid
1492         InvalidFeatures,
1493
1494         /// The recovery id doesn't fit the signature/pub key
1495         InvalidRecoveryId,
1496
1497         /// The invoice's signature is invalid
1498         InvalidSignature,
1499
1500         /// The invoice's amount was not a whole number of millisatoshis
1501         ImpreciseAmount,
1502 }
1503
1504 impl Display for SemanticError {
1505         fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
1506                 match self {
1507                         SemanticError::NoPaymentHash => f.write_str("The invoice is missing the mandatory payment hash"),
1508                         SemanticError::MultiplePaymentHashes => f.write_str("The invoice has multiple payment hashes which isn't allowed"),
1509                         SemanticError::NoDescription => f.write_str("No description or description hash are part of the invoice"),
1510                         SemanticError::MultipleDescriptions => f.write_str("The invoice contains multiple descriptions and/or description hashes which isn't allowed"),
1511                         SemanticError::NoPaymentSecret => f.write_str("The invoice is missing the mandatory payment secret"),
1512                         SemanticError::MultiplePaymentSecrets => f.write_str("The invoice contains multiple payment secrets"),
1513                         SemanticError::InvalidFeatures => f.write_str("The invoice's features are invalid"),
1514                         SemanticError::InvalidRecoveryId => f.write_str("The recovery id doesn't fit the signature/pub key"),
1515                         SemanticError::InvalidSignature => f.write_str("The invoice's signature is invalid"),
1516                         SemanticError::ImpreciseAmount => f.write_str("The invoice's amount was not a whole number of millisatoshis"),
1517                 }
1518         }
1519 }
1520
1521 #[cfg(feature = "std")]
1522 impl std::error::Error for SemanticError { }
1523
1524 /// When signing using a fallible method either an user-supplied `SignError` or a `CreationError`
1525 /// may occur.
1526 #[derive(Eq, PartialEq, Debug, Clone)]
1527 pub enum SignOrCreationError<S = ()> {
1528         /// An error occurred during signing
1529         SignError(S),
1530
1531         /// An error occurred while building the transaction
1532         CreationError(CreationError),
1533 }
1534
1535 impl<S> Display for SignOrCreationError<S> {
1536         fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
1537                 match self {
1538                         SignOrCreationError::SignError(_) => f.write_str("An error occurred during signing"),
1539                         SignOrCreationError::CreationError(err) => err.fmt(f),
1540                 }
1541         }
1542 }
1543
1544 #[cfg(feature = "serde")]
1545 impl Serialize for Invoice {
1546         fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer {
1547                 serializer.serialize_str(self.to_string().as_str())
1548         }
1549 }
1550 #[cfg(feature = "serde")]
1551 impl<'de> Deserialize<'de> for Invoice {
1552         fn deserialize<D>(deserializer: D) -> Result<Invoice, D::Error> where D: Deserializer<'de> {
1553                 let bolt11 = String::deserialize(deserializer)?
1554                         .parse::<Invoice>()
1555                         .map_err(|e| D::Error::custom(format!("{:?}", e)))?;
1556
1557                 Ok(bolt11)
1558         }
1559 }
1560
1561 #[cfg(test)]
1562 mod test {
1563         use bitcoin_hashes::hex::FromHex;
1564         use bitcoin_hashes::sha256;
1565
1566         #[test]
1567         fn test_system_time_bounds_assumptions() {
1568                 assert_eq!(
1569                         crate::PositiveTimestamp::from_unix_timestamp(crate::MAX_TIMESTAMP + 1),
1570                         Err(crate::CreationError::TimestampOutOfBounds)
1571                 );
1572         }
1573
1574         #[test]
1575         fn test_calc_invoice_hash() {
1576                 use crate::{RawInvoice, RawHrp, RawDataPart, Currency, PositiveTimestamp};
1577                 use crate::TaggedField::*;
1578
1579                 let invoice = RawInvoice {
1580                         hrp: RawHrp {
1581                                 currency: Currency::Bitcoin,
1582                                 raw_amount: None,
1583                                 si_prefix: None,
1584                         },
1585                         data: RawDataPart {
1586                                 timestamp: PositiveTimestamp::from_unix_timestamp(1496314658).unwrap(),
1587                                 tagged_fields: vec![
1588                                         PaymentHash(crate::Sha256(sha256::Hash::from_hex(
1589                                                 "0001020304050607080900010203040506070809000102030405060708090102"
1590                                         ).unwrap())).into(),
1591                                         Description(crate::Description::new(
1592                                                 "Please consider supporting this project".to_owned()
1593                                         ).unwrap()).into(),
1594                                 ],
1595                         },
1596                 };
1597
1598                 let expected_hash = [
1599                         0xc3, 0xd4, 0xe8, 0x3f, 0x64, 0x6f, 0xa7, 0x9a, 0x39, 0x3d, 0x75, 0x27, 0x7b, 0x1d,
1600                         0x85, 0x8d, 0xb1, 0xd1, 0xf7, 0xab, 0x71, 0x37, 0xdc, 0xb7, 0x83, 0x5d, 0xb2, 0xec,
1601                         0xd5, 0x18, 0xe1, 0xc9
1602                 ];
1603
1604                 assert_eq!(invoice.signable_hash(), expected_hash)
1605         }
1606
1607         #[test]
1608         fn test_check_signature() {
1609                 use crate::TaggedField::*;
1610                 use secp256k1::Secp256k1;
1611                 use secp256k1::ecdsa::{RecoveryId, RecoverableSignature};
1612                 use secp256k1::{SecretKey, PublicKey};
1613                 use crate::{SignedRawInvoice, InvoiceSignature, RawInvoice, RawHrp, RawDataPart, Currency, Sha256,
1614                          PositiveTimestamp};
1615
1616                 let invoice = SignedRawInvoice {
1617                         raw_invoice: RawInvoice {
1618                                 hrp: RawHrp {
1619                                         currency: Currency::Bitcoin,
1620                                         raw_amount: None,
1621                                         si_prefix: None,
1622                                 },
1623                                 data: RawDataPart {
1624                                         timestamp: PositiveTimestamp::from_unix_timestamp(1496314658).unwrap(),
1625                                         tagged_fields: vec ! [
1626                                                 PaymentHash(Sha256(sha256::Hash::from_hex(
1627                                                         "0001020304050607080900010203040506070809000102030405060708090102"
1628                                                 ).unwrap())).into(),
1629                                                 Description(
1630                                                         crate::Description::new(
1631                                                                 "Please consider supporting this project".to_owned()
1632                                                         ).unwrap()
1633                                                 ).into(),
1634                                         ],
1635                                 },
1636                         },
1637                         hash: [
1638                                 0xc3, 0xd4, 0xe8, 0x3f, 0x64, 0x6f, 0xa7, 0x9a, 0x39, 0x3d, 0x75, 0x27,
1639                                 0x7b, 0x1d, 0x85, 0x8d, 0xb1, 0xd1, 0xf7, 0xab, 0x71, 0x37, 0xdc, 0xb7,
1640                                 0x83, 0x5d, 0xb2, 0xec, 0xd5, 0x18, 0xe1, 0xc9
1641                         ],
1642                         signature: InvoiceSignature(RecoverableSignature::from_compact(
1643                                 & [
1644                                         0x38u8, 0xec, 0x68, 0x91, 0x34, 0x5e, 0x20, 0x41, 0x45, 0xbe, 0x8a,
1645                                         0x3a, 0x99, 0xde, 0x38, 0xe9, 0x8a, 0x39, 0xd6, 0xa5, 0x69, 0x43,
1646                                         0x4e, 0x18, 0x45, 0xc8, 0xaf, 0x72, 0x05, 0xaf, 0xcf, 0xcc, 0x7f,
1647                                         0x42, 0x5f, 0xcd, 0x14, 0x63, 0xe9, 0x3c, 0x32, 0x88, 0x1e, 0xad,
1648                                         0x0d, 0x6e, 0x35, 0x6d, 0x46, 0x7e, 0xc8, 0xc0, 0x25, 0x53, 0xf9,
1649                                         0xaa, 0xb1, 0x5e, 0x57, 0x38, 0xb1, 0x1f, 0x12, 0x7f
1650                                 ],
1651                                 RecoveryId::from_i32(0).unwrap()
1652                         ).unwrap()),
1653                 };
1654
1655                 assert!(invoice.check_signature());
1656
1657                 let private_key = SecretKey::from_slice(
1658                         &[
1659                                 0xe1, 0x26, 0xf6, 0x8f, 0x7e, 0xaf, 0xcc, 0x8b, 0x74, 0xf5, 0x4d, 0x26, 0x9f, 0xe2,
1660                                 0x06, 0xbe, 0x71, 0x50, 0x00, 0xf9, 0x4d, 0xac, 0x06, 0x7d, 0x1c, 0x04, 0xa8, 0xca,
1661                                 0x3b, 0x2d, 0xb7, 0x34
1662                         ][..]
1663                 ).unwrap();
1664                 let public_key = PublicKey::from_secret_key(&Secp256k1::new(), &private_key);
1665
1666                 assert_eq!(invoice.recover_payee_pub_key(), Ok(crate::PayeePubKey(public_key)));
1667
1668                 let (raw_invoice, _, _) = invoice.into_parts();
1669                 let new_signed = raw_invoice.sign::<_, ()>(|hash| {
1670                         Ok(Secp256k1::new().sign_ecdsa_recoverable(hash, &private_key))
1671                 }).unwrap();
1672
1673                 assert!(new_signed.check_signature());
1674         }
1675
1676         #[test]
1677         fn test_check_feature_bits() {
1678                 use crate::TaggedField::*;
1679                 use lightning::ln::features::InvoiceFeatures;
1680                 use secp256k1::Secp256k1;
1681                 use secp256k1::SecretKey;
1682                 use crate::{RawInvoice, RawHrp, RawDataPart, Currency, Sha256, PositiveTimestamp, Invoice,
1683                          SemanticError};
1684
1685                 let private_key = SecretKey::from_slice(&[42; 32]).unwrap();
1686                 let payment_secret = lightning::ln::PaymentSecret([21; 32]);
1687                 let invoice_template = RawInvoice {
1688                         hrp: RawHrp {
1689                                 currency: Currency::Bitcoin,
1690                                 raw_amount: None,
1691                                 si_prefix: None,
1692                         },
1693                         data: RawDataPart {
1694                                 timestamp: PositiveTimestamp::from_unix_timestamp(1496314658).unwrap(),
1695                                 tagged_fields: vec ! [
1696                                         PaymentHash(Sha256(sha256::Hash::from_hex(
1697                                                 "0001020304050607080900010203040506070809000102030405060708090102"
1698                                         ).unwrap())).into(),
1699                                         Description(
1700                                                 crate::Description::new(
1701                                                         "Please consider supporting this project".to_owned()
1702                                                 ).unwrap()
1703                                         ).into(),
1704                                 ],
1705                         },
1706                 };
1707
1708                 // Missing features
1709                 let invoice = {
1710                         let mut invoice = invoice_template.clone();
1711                         invoice.data.tagged_fields.push(PaymentSecret(payment_secret).into());
1712                         invoice.sign::<_, ()>(|hash| Ok(Secp256k1::new().sign_ecdsa_recoverable(hash, &private_key)))
1713                 }.unwrap();
1714                 assert_eq!(Invoice::from_signed(invoice), Err(SemanticError::InvalidFeatures));
1715
1716                 // Missing feature bits
1717                 let invoice = {
1718                         let mut invoice = invoice_template.clone();
1719                         invoice.data.tagged_fields.push(PaymentSecret(payment_secret).into());
1720                         invoice.data.tagged_fields.push(Features(InvoiceFeatures::empty()).into());
1721                         invoice.sign::<_, ()>(|hash| Ok(Secp256k1::new().sign_ecdsa_recoverable(hash, &private_key)))
1722                 }.unwrap();
1723                 assert_eq!(Invoice::from_signed(invoice), Err(SemanticError::InvalidFeatures));
1724
1725                 let mut payment_secret_features = InvoiceFeatures::empty();
1726                 payment_secret_features.set_payment_secret_required();
1727
1728                 // Including payment secret and feature bits
1729                 let invoice = {
1730                         let mut invoice = invoice_template.clone();
1731                         invoice.data.tagged_fields.push(PaymentSecret(payment_secret).into());
1732                         invoice.data.tagged_fields.push(Features(payment_secret_features.clone()).into());
1733                         invoice.sign::<_, ()>(|hash| Ok(Secp256k1::new().sign_ecdsa_recoverable(hash, &private_key)))
1734                 }.unwrap();
1735                 assert!(Invoice::from_signed(invoice).is_ok());
1736
1737                 // No payment secret or features
1738                 let invoice = {
1739                         let invoice = invoice_template.clone();
1740                         invoice.sign::<_, ()>(|hash| Ok(Secp256k1::new().sign_ecdsa_recoverable(hash, &private_key)))
1741                 }.unwrap();
1742                 assert_eq!(Invoice::from_signed(invoice), Err(SemanticError::NoPaymentSecret));
1743
1744                 // No payment secret or feature bits
1745                 let invoice = {
1746                         let mut invoice = invoice_template.clone();
1747                         invoice.data.tagged_fields.push(Features(InvoiceFeatures::empty()).into());
1748                         invoice.sign::<_, ()>(|hash| Ok(Secp256k1::new().sign_ecdsa_recoverable(hash, &private_key)))
1749                 }.unwrap();
1750                 assert_eq!(Invoice::from_signed(invoice), Err(SemanticError::NoPaymentSecret));
1751
1752                 // Missing payment secret
1753                 let invoice = {
1754                         let mut invoice = invoice_template.clone();
1755                         invoice.data.tagged_fields.push(Features(payment_secret_features).into());
1756                         invoice.sign::<_, ()>(|hash| Ok(Secp256k1::new().sign_ecdsa_recoverable(hash, &private_key)))
1757                 }.unwrap();
1758                 assert_eq!(Invoice::from_signed(invoice), Err(SemanticError::NoPaymentSecret));
1759
1760                 // Multiple payment secrets
1761                 let invoice = {
1762                         let mut invoice = invoice_template.clone();
1763                         invoice.data.tagged_fields.push(PaymentSecret(payment_secret).into());
1764                         invoice.data.tagged_fields.push(PaymentSecret(payment_secret).into());
1765                         invoice.sign::<_, ()>(|hash| Ok(Secp256k1::new().sign_ecdsa_recoverable(hash, &private_key)))
1766                 }.unwrap();
1767                 assert_eq!(Invoice::from_signed(invoice), Err(SemanticError::MultiplePaymentSecrets));
1768         }
1769
1770         #[test]
1771         fn test_builder_amount() {
1772                 use crate::*;
1773
1774                 let builder = InvoiceBuilder::new(Currency::Bitcoin)
1775                         .description("Test".into())
1776                         .payment_hash(sha256::Hash::from_slice(&[0;32][..]).unwrap())
1777                         .duration_since_epoch(Duration::from_secs(1234567));
1778
1779                 let invoice = builder.clone()
1780                         .amount_milli_satoshis(1500)
1781                         .build_raw()
1782                         .unwrap();
1783
1784                 assert_eq!(invoice.hrp.si_prefix, Some(SiPrefix::Nano));
1785                 assert_eq!(invoice.hrp.raw_amount, Some(15));
1786
1787
1788                 let invoice = builder.clone()
1789                         .amount_milli_satoshis(150)
1790                         .build_raw()
1791                         .unwrap();
1792
1793                 assert_eq!(invoice.hrp.si_prefix, Some(SiPrefix::Pico));
1794                 assert_eq!(invoice.hrp.raw_amount, Some(1500));
1795         }
1796
1797         #[test]
1798         fn test_builder_fail() {
1799                 use crate::*;
1800                 use lightning::routing::router::RouteHintHop;
1801                 use std::iter::FromIterator;
1802                 use secp256k1::PublicKey;
1803
1804                 let builder = InvoiceBuilder::new(Currency::Bitcoin)
1805                         .payment_hash(sha256::Hash::from_slice(&[0;32][..]).unwrap())
1806                         .duration_since_epoch(Duration::from_secs(1234567))
1807                         .min_final_cltv_expiry(144);
1808
1809                 let too_long_string = String::from_iter(
1810                         (0..1024).map(|_| '?')
1811                 );
1812
1813                 let long_desc_res = builder.clone()
1814                         .description(too_long_string)
1815                         .build_raw();
1816                 assert_eq!(long_desc_res, Err(CreationError::DescriptionTooLong));
1817
1818                 let route_hop = RouteHintHop {
1819                         src_node_id: PublicKey::from_slice(
1820                                         &[
1821                                                 0x03, 0x9e, 0x03, 0xa9, 0x01, 0xb8, 0x55, 0x34, 0xff, 0x1e, 0x92, 0xc4,
1822                                                 0x3c, 0x74, 0x43, 0x1f, 0x7c, 0xe7, 0x20, 0x46, 0x06, 0x0f, 0xcf, 0x7a,
1823                                                 0x95, 0xc3, 0x7e, 0x14, 0x8f, 0x78, 0xc7, 0x72, 0x55
1824                                         ][..]
1825                                 ).unwrap(),
1826                         short_channel_id: 0,
1827                         fees: RoutingFees {
1828                                 base_msat: 0,
1829                                 proportional_millionths: 0,
1830                         },
1831                         cltv_expiry_delta: 0,
1832                         htlc_minimum_msat: None,
1833                         htlc_maximum_msat: None,
1834                 };
1835                 let too_long_route = RouteHint(vec![route_hop; 13]);
1836                 let long_route_res = builder.clone()
1837                         .description("Test".into())
1838                         .private_route(too_long_route)
1839                         .build_raw();
1840                 assert_eq!(long_route_res, Err(CreationError::RouteTooLong));
1841
1842                 let sign_error_res = builder.clone()
1843                         .description("Test".into())
1844                         .payment_secret(PaymentSecret([0; 32]))
1845                         .try_build_signed(|_| {
1846                                 Err("ImaginaryError")
1847                         });
1848                 assert_eq!(sign_error_res, Err(SignOrCreationError::SignError("ImaginaryError")));
1849         }
1850
1851         #[test]
1852         fn test_builder_ok() {
1853                 use crate::*;
1854                 use lightning::routing::router::RouteHintHop;
1855                 use secp256k1::Secp256k1;
1856                 use secp256k1::{SecretKey, PublicKey};
1857                 use std::time::{UNIX_EPOCH, Duration};
1858
1859                 let secp_ctx = Secp256k1::new();
1860
1861                 let private_key = SecretKey::from_slice(
1862                         &[
1863                                 0xe1, 0x26, 0xf6, 0x8f, 0x7e, 0xaf, 0xcc, 0x8b, 0x74, 0xf5, 0x4d, 0x26, 0x9f, 0xe2,
1864                                 0x06, 0xbe, 0x71, 0x50, 0x00, 0xf9, 0x4d, 0xac, 0x06, 0x7d, 0x1c, 0x04, 0xa8, 0xca,
1865                                 0x3b, 0x2d, 0xb7, 0x34
1866                         ][..]
1867                 ).unwrap();
1868                 let public_key = PublicKey::from_secret_key(&secp_ctx, &private_key);
1869
1870                 let route_1 = RouteHint(vec![
1871                         RouteHintHop {
1872                                 src_node_id: public_key.clone(),
1873                                 short_channel_id: de::parse_int_be(&[123; 8], 256).expect("short chan ID slice too big?"),
1874                                 fees: RoutingFees {
1875                                         base_msat: 2,
1876                                         proportional_millionths: 1,
1877                                 },
1878                                 cltv_expiry_delta: 145,
1879                                 htlc_minimum_msat: None,
1880                                 htlc_maximum_msat: None,
1881                         },
1882                         RouteHintHop {
1883                                 src_node_id: public_key.clone(),
1884                                 short_channel_id: de::parse_int_be(&[42; 8], 256).expect("short chan ID slice too big?"),
1885                                 fees: RoutingFees {
1886                                         base_msat: 3,
1887                                         proportional_millionths: 2,
1888                                 },
1889                                 cltv_expiry_delta: 146,
1890                                 htlc_minimum_msat: None,
1891                                 htlc_maximum_msat: None,
1892                         }
1893                 ]);
1894
1895                 let route_2 = RouteHint(vec![
1896                         RouteHintHop {
1897                                 src_node_id: public_key.clone(),
1898                                 short_channel_id: 0,
1899                                 fees: RoutingFees {
1900                                         base_msat: 4,
1901                                         proportional_millionths: 3,
1902                                 },
1903                                 cltv_expiry_delta: 147,
1904                                 htlc_minimum_msat: None,
1905                                 htlc_maximum_msat: None,
1906                         },
1907                         RouteHintHop {
1908                                 src_node_id: public_key.clone(),
1909                                 short_channel_id: de::parse_int_be(&[1; 8], 256).expect("short chan ID slice too big?"),
1910                                 fees: RoutingFees {
1911                                         base_msat: 5,
1912                                         proportional_millionths: 4,
1913                                 },
1914                                 cltv_expiry_delta: 148,
1915                                 htlc_minimum_msat: None,
1916                                 htlc_maximum_msat: None,
1917                         }
1918                 ]);
1919
1920                 let builder = InvoiceBuilder::new(Currency::BitcoinTestnet)
1921                         .amount_milli_satoshis(123)
1922                         .duration_since_epoch(Duration::from_secs(1234567))
1923                         .payee_pub_key(public_key.clone())
1924                         .expiry_time(Duration::from_secs(54321))
1925                         .min_final_cltv_expiry(144)
1926                         .fallback(Fallback::PubKeyHash([0;20]))
1927                         .private_route(route_1.clone())
1928                         .private_route(route_2.clone())
1929                         .description_hash(sha256::Hash::from_slice(&[3;32][..]).unwrap())
1930                         .payment_hash(sha256::Hash::from_slice(&[21;32][..]).unwrap())
1931                         .payment_secret(PaymentSecret([42; 32]))
1932                         .basic_mpp();
1933
1934                 let invoice = builder.clone().build_signed(|hash| {
1935                         secp_ctx.sign_ecdsa_recoverable(hash, &private_key)
1936                 }).unwrap();
1937
1938                 assert!(invoice.check_signature().is_ok());
1939                 assert_eq!(invoice.tagged_fields().count(), 10);
1940
1941                 assert_eq!(invoice.amount_milli_satoshis(), Some(123));
1942                 assert_eq!(invoice.amount_pico_btc(), Some(1230));
1943                 assert_eq!(invoice.currency(), Currency::BitcoinTestnet);
1944                 #[cfg(feature = "std")]
1945                 assert_eq!(
1946                         invoice.timestamp().duration_since(UNIX_EPOCH).unwrap().as_secs(),
1947                         1234567
1948                 );
1949                 assert_eq!(invoice.payee_pub_key(), Some(&public_key));
1950                 assert_eq!(invoice.expiry_time(), Duration::from_secs(54321));
1951                 assert_eq!(invoice.min_final_cltv_expiry(), 144);
1952                 assert_eq!(invoice.fallbacks(), vec![&Fallback::PubKeyHash([0;20])]);
1953                 assert_eq!(invoice.private_routes(), vec![&PrivateRoute(route_1), &PrivateRoute(route_2)]);
1954                 assert_eq!(
1955                         invoice.description(),
1956                         InvoiceDescription::Hash(&Sha256(sha256::Hash::from_slice(&[3;32][..]).unwrap()))
1957                 );
1958                 assert_eq!(invoice.payment_hash(), &sha256::Hash::from_slice(&[21;32][..]).unwrap());
1959                 assert_eq!(invoice.payment_secret(), &PaymentSecret([42; 32]));
1960
1961                 let mut expected_features = InvoiceFeatures::empty();
1962                 expected_features.set_variable_length_onion_required();
1963                 expected_features.set_payment_secret_required();
1964                 expected_features.set_basic_mpp_optional();
1965                 assert_eq!(invoice.features(), Some(&expected_features));
1966
1967                 let raw_invoice = builder.build_raw().unwrap();
1968                 assert_eq!(raw_invoice, *invoice.into_signed_raw().raw_invoice())
1969         }
1970
1971         #[test]
1972         fn test_default_values() {
1973                 use crate::*;
1974                 use secp256k1::Secp256k1;
1975                 use secp256k1::SecretKey;
1976
1977                 let signed_invoice = InvoiceBuilder::new(Currency::Bitcoin)
1978                         .description("Test".into())
1979                         .payment_hash(sha256::Hash::from_slice(&[0;32][..]).unwrap())
1980                         .payment_secret(PaymentSecret([0; 32]))
1981                         .duration_since_epoch(Duration::from_secs(1234567))
1982                         .build_raw()
1983                         .unwrap()
1984                         .sign::<_, ()>(|hash| {
1985                                 let privkey = SecretKey::from_slice(&[41; 32]).unwrap();
1986                                 let secp_ctx = Secp256k1::new();
1987                                 Ok(secp_ctx.sign_ecdsa_recoverable(hash, &privkey))
1988                         })
1989                         .unwrap();
1990                 let invoice = Invoice::from_signed(signed_invoice).unwrap();
1991
1992                 assert_eq!(invoice.min_final_cltv_expiry(), DEFAULT_MIN_FINAL_CLTV_EXPIRY);
1993                 assert_eq!(invoice.expiry_time(), Duration::from_secs(DEFAULT_EXPIRY_TIME));
1994                 assert!(!invoice.would_expire(Duration::from_secs(1234568)));
1995         }
1996
1997         #[test]
1998         fn test_expiration() {
1999                 use crate::*;
2000                 use secp256k1::Secp256k1;
2001                 use secp256k1::SecretKey;
2002
2003                 let signed_invoice = InvoiceBuilder::new(Currency::Bitcoin)
2004                         .description("Test".into())
2005                         .payment_hash(sha256::Hash::from_slice(&[0;32][..]).unwrap())
2006                         .payment_secret(PaymentSecret([0; 32]))
2007                         .duration_since_epoch(Duration::from_secs(1234567))
2008                         .build_raw()
2009                         .unwrap()
2010                         .sign::<_, ()>(|hash| {
2011                                 let privkey = SecretKey::from_slice(&[41; 32]).unwrap();
2012                                 let secp_ctx = Secp256k1::new();
2013                                 Ok(secp_ctx.sign_ecdsa_recoverable(hash, &privkey))
2014                         })
2015                         .unwrap();
2016                 let invoice = Invoice::from_signed(signed_invoice).unwrap();
2017
2018                 assert!(invoice.would_expire(Duration::from_secs(1234567 + DEFAULT_EXPIRY_TIME + 1)));
2019         }
2020
2021         #[cfg(feature = "serde")]
2022         #[test]
2023         fn test_serde() {
2024                 let invoice_str = "lnbc100p1psj9jhxdqud3jxktt5w46x7unfv9kz6mn0v3jsnp4q0d3p2sfluzdx45tqcs\
2025                         h2pu5qc7lgq0xs578ngs6s0s68ua4h7cvspp5q6rmq35js88zp5dvwrv9m459tnk2zunwj5jalqtyxqulh0l\
2026                         5gflssp5nf55ny5gcrfl30xuhzj3nphgj27rstekmr9fw3ny5989s300gyus9qyysgqcqpcrzjqw2sxwe993\
2027                         h5pcm4dxzpvttgza8zhkqxpgffcrf5v25nwpr3cmfg7z54kuqq8rgqqqqqqqq2qqqqq9qq9qrzjqd0ylaqcl\
2028                         j9424x9m8h2vcukcgnm6s56xfgu3j78zyqzhgs4hlpzvznlugqq9vsqqqqqqqlgqqqqqeqq9qrzjqwldmj9d\
2029                         ha74df76zhx6l9we0vjdquygcdt3kssupehe64g6yyp5yz5rhuqqwccqqyqqqqlgqqqqjcqq9qrzjqf9e58a\
2030                         guqr0rcun0ajlvmzq3ek63cw2w282gv3z5uupmuwvgjtq2z55qsqqg6qqqyqqqrtnqqqzq3cqygrzjqvphms\
2031                         ywntrrhqjcraumvc4y6r8v4z5v593trte429v4hredj7ms5z52usqq9ngqqqqqqqlgqqqqqqgq9qrzjq2v0v\
2032                         p62g49p7569ev48cmulecsxe59lvaw3wlxm7r982zxa9zzj7z5l0cqqxusqqyqqqqlgqqqqqzsqygarl9fh3\
2033                         8s0gyuxjjgux34w75dnc6xp2l35j7es3jd4ugt3lu0xzre26yg5m7ke54n2d5sym4xcmxtl8238xxvw5h5h5\
2034                         j5r6drg6k6zcqj0fcwg";
2035                 let invoice = invoice_str.parse::<super::Invoice>().unwrap();
2036                 let serialized_invoice = serde_json::to_string(&invoice).unwrap();
2037                 let deserialized_invoice: super::Invoice = serde_json::from_str(serialized_invoice.as_str()).unwrap();
2038                 assert_eq!(invoice, deserialized_invoice);
2039                 assert_eq!(invoice_str, deserialized_invoice.to_string().as_str());
2040                 assert_eq!(invoice_str, serialized_invoice.as_str().trim_matches('\"'));
2041         }
2042 }