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// Bitcoin Dev Kit // Written in 2020 by Alekos Filini <alekos.filini@gmail.com> // // Copyright (c) 2020-2021 Bitcoin Dev Kit Developers // // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option. // You may not use this file except in accordance with one or both of these // licenses. //! Address validation callbacks //! //! The typical usage of those callbacks is for displaying the newly-generated address on a //! hardware wallet, so that the user can cross-check its correctness. //! //! More generally speaking though, these callbacks can also be used to "do something" every time //! an address is generated, without necessarily checking or validating it. //! //! An address validator can be attached to a [`Wallet`](super::Wallet) by using the //! [`Wallet::add_address_validator`](super::Wallet::add_address_validator) method, and //! whenever a new address is generated (either explicitly by the user with //! [`Wallet::get_address`](super::Wallet::get_address) or internally to create a change //! address) all the attached validators will be polled, in sequence. All of them must complete //! successfully to continue. //! //! ## Example //! //! ``` //! # use std::sync::Arc; //! # use bitcoin::*; //! # use bdk::address_validator::*; //! # use bdk::database::*; //! # use bdk::*; //! # use bdk::wallet::AddressIndex::New; //! #[derive(Debug)] //! struct PrintAddressAndContinue; //! //! impl AddressValidator for PrintAddressAndContinue { //! fn validate( //! &self, //! keychain: KeychainKind, //! hd_keypaths: &HdKeyPaths, //! script: &Script //! ) -> Result<(), AddressValidatorError> { //! let address = Address::from_script(script, Network::Testnet) //! .as_ref() //! .map(Address::to_string) //! .unwrap_or(script.to_string()); //! println!("New address of type {:?}: {}", keychain, address); //! println!("HD keypaths: {:#?}", hd_keypaths); //! //! Ok(()) //! } //! } //! //! let descriptor = "wpkh(tpubD6NzVbkrYhZ4Xferm7Pz4VnjdcDPFyjVu5K4iZXQ4pVN8Cks4pHVowTBXBKRhX64pkRyJZJN5xAKj4UDNnLPb5p2sSKXhewoYx5GbTdUFWq/*)"; //! let mut wallet = Wallet::new_offline(descriptor, None, Network::Testnet, MemoryDatabase::default())?; //! wallet.add_address_validator(Arc::new(PrintAddressAndContinue)); //! //! let address = wallet.get_address(New)?; //! println!("Address: {}", address); //! # Ok::<(), bdk::Error>(()) //! ``` use std::fmt; use bitcoin::Script; use crate::descriptor::HdKeyPaths; use crate::types::KeychainKind; /// Errors that can be returned to fail the validation of an address #[derive(Debug, Clone, PartialEq, Eq)] pub enum AddressValidatorError { /// User rejected the address UserRejected, /// Network connection error ConnectionError, /// Network request timeout error TimeoutError, /// Invalid script InvalidScript, /// A custom error message Message(String), } impl fmt::Display for AddressValidatorError { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "{:?}", self) } } impl std::error::Error for AddressValidatorError {} /// Trait to build address validators /// /// All the address validators attached to a wallet with [`Wallet::add_address_validator`](super::Wallet::add_address_validator) will be polled /// every time an address (external or internal) is generated by the wallet. Errors returned in the /// validator will be propagated up to the original caller that triggered the address generation. /// /// For a usage example see [this module](crate::address_validator)'s documentation. pub trait AddressValidator: Send + Sync + fmt::Debug { /// Validate or inspect an address fn validate( &self, keychain: KeychainKind, hd_keypaths: &HdKeyPaths, script: &Script, ) -> Result<(), AddressValidatorError>; } #[cfg(test)] mod test { use std::sync::Arc; use super::*; use crate::wallet::test::{get_funded_wallet, get_test_wpkh}; use crate::wallet::AddressIndex::New; #[derive(Debug)] struct TestValidator; impl AddressValidator for TestValidator { fn validate( &self, _keychain: KeychainKind, _hd_keypaths: &HdKeyPaths, _script: &bitcoin::Script, ) -> Result<(), AddressValidatorError> { Err(AddressValidatorError::InvalidScript) } } #[test] #[should_panic(expected = "InvalidScript")] fn test_address_validator_external() { let (mut wallet, _, _) = get_funded_wallet(get_test_wpkh()); wallet.add_address_validator(Arc::new(TestValidator)); wallet.get_address(New).unwrap(); } #[test] #[should_panic(expected = "InvalidScript")] fn test_address_validator_internal() { let (mut wallet, descriptors, _) = get_funded_wallet(get_test_wpkh()); wallet.add_address_validator(Arc::new(TestValidator)); let addr = crate::testutils!(@external descriptors, 10); let mut builder = wallet.build_tx(); builder.add_recipient(addr.script_pubkey(), 25_000); builder.finish().unwrap(); } }