wip(refactor(wallet))!: remove signers APIs

- use default empty `SignersContainer::new()` on both wallet
  `create_with_params` and `load_with_params`.
- remove `add_signer`, `set_keymap` and `get_signers` methods.
- updates `FullyNodedExport::export_wallet` to export public descriptors
  only, and updates it's tests accordingly.
- remove test assertions for signers/keymaps creation/load.

Author: oleonardolima

wallet/src/wallet/export.rs

@@ -60,7 +60,7 @@ use core::fmt;
 use core::str::FromStr;
 use serde::{Deserialize, Serialize};
 
-use miniscript::descriptor::{ShInner, WshInner};
+use miniscript::descriptor::{KeyMap, ShInner, WshInner};
 use miniscript::{Descriptor, ScriptContext, Terminal};
 
 use crate::types::KeychainKind;
@@ -119,11 +119,8 @@ impl FullyNodedExport {
     ) -> Result<Self, &'static str> {
         let descriptor = wallet
             .public_descriptor(KeychainKind::External)
-            .to_string_with_secret(
-                &wallet
-                    .get_signers(KeychainKind::External)
-                    .as_key_map(wallet.secp_ctx()),
-            );
+            .to_string_with_secret(&KeyMap::new());
+
         let descriptor = remove_checksum(descriptor);
         Self::is_compatible_with_core(&descriptor)?;
 
@@ -147,11 +144,7 @@ impl FullyNodedExport {
         let change_descriptor = {
             let descriptor = wallet
                 .public_descriptor(KeychainKind::Internal)
-                .to_string_with_secret(
-                    &wallet
-                        .get_signers(KeychainKind::Internal)
-                        .as_key_map(wallet.secp_ctx()),
-                );
+                .to_string_with_secret(&KeyMap::new());
             Some(remove_checksum(descriptor))
         };
 
@@ -239,16 +232,23 @@ mod test {
         wallet
     }
 
+    // TODO: (@leonardo) what's the best way to update these tests ?
     #[test]
     fn test_export_bip44() {
         let descriptor = "wpkh(xprv9s21ZrQH143K4CTb63EaMxja1YiTnSEWKMbn23uoEnAzxjdUJRQkazCAtzxGm4LSoTSVTptoV9RbchnKPW9HxKtZumdyxyikZFDLhogJ5Uj/44'/0'/0'/0/*)";
+        let public_descriptor = "wpkh([a12b02f4/44'/0'/0']xpub6BzhLAQUDcBUfHRQHZxDF2AbcJqp4Kaeq6bzJpXrjrWuK26ymTFwkEFbxPra2bJ7yeZKbDjfDeFwxe93JMqpo5SsPJH6dZdvV9kMzJkAZ69/0/*)";
+
         let change_descriptor = "wpkh(xprv9s21ZrQH143K4CTb63EaMxja1YiTnSEWKMbn23uoEnAzxjdUJRQkazCAtzxGm4LSoTSVTptoV9RbchnKPW9HxKtZumdyxyikZFDLhogJ5Uj/44'/0'/0'/1/*)";
+        let public_change_descriptor = "wpkh([a12b02f4/44'/0'/0']xpub6BzhLAQUDcBUfHRQHZxDF2AbcJqp4Kaeq6bzJpXrjrWuK26ymTFwkEFbxPra2bJ7yeZKbDjfDeFwxe93JMqpo5SsPJH6dZdvV9kMzJkAZ69/1/*)";
 
         let wallet = get_test_wallet(descriptor, change_descriptor, Network::Bitcoin);
         let export = FullyNodedExport::export_wallet(&wallet, "Test Label", true).unwrap();
 
-        assert_eq!(export.descriptor(), descriptor);
-        assert_eq!(export.change_descriptor(), Some(change_descriptor.into()));
+        assert_eq!(export.descriptor(), public_descriptor);
+        assert_eq!(
+            export.change_descriptor(),
+            Some(public_change_descriptor.into())
+        );
         assert_eq!(export.blockheight, 5000);
         assert_eq!(export.label, "Test Label");
     }
@@ -305,24 +305,33 @@ mod test {
     #[test]
     fn test_export_tr() {
         let descriptor = "tr([73c5da0a/86'/0'/0']tprv8fMn4hSKPRC1oaCPqxDb1JWtgkpeiQvZhsr8W2xuy3GEMkzoArcAWTfJxYb6Wj8XNNDWEjfYKK4wGQXh3ZUXhDF2NcnsALpWTeSwarJt7Vc/0/*)";
+        let public_descriptor = "tr([73c5da0a/86'/0'/0']tpubDC3pD7UZXnsgh3EBjbtBQiB1FnLask7UHBSunZ1DPK4dCFFZoFRkgxHB8gt42FvLzx1DpxfHWxAsYaY6b643RVcGjDxXxns7wKKYnnfEcbB/0/*)";
+
         let change_descriptor = "tr([73c5da0a/86'/0'/0']tprv8fMn4hSKPRC1oaCPqxDb1JWtgkpeiQvZhsr8W2xuy3GEMkzoArcAWTfJxYb6Wj8XNNDWEjfYKK4wGQXh3ZUXhDF2NcnsALpWTeSwarJt7Vc/1/*)";
+        let public_change_descriptor = "tr([73c5da0a/86'/0'/0']tpubDC3pD7UZXnsgh3EBjbtBQiB1FnLask7UHBSunZ1DPK4dCFFZoFRkgxHB8gt42FvLzx1DpxfHWxAsYaY6b643RVcGjDxXxns7wKKYnnfEcbB/1/*)";
+
         let wallet = get_test_wallet(descriptor, change_descriptor, Network::Testnet);
         let export = FullyNodedExport::export_wallet(&wallet, "Test Label", true).unwrap();
-        assert_eq!(export.descriptor(), descriptor);
-        assert_eq!(export.change_descriptor(), Some(change_descriptor.into()));
+        assert_eq!(export.descriptor(), public_descriptor);
+        assert_eq!(
+            export.change_descriptor(),
+            Some(public_change_descriptor.into())
+        );
         assert_eq!(export.blockheight, 5000);
         assert_eq!(export.label, "Test Label");
     }
 
     #[test]
     fn test_export_to_json() {
         let descriptor = "wpkh(xprv9s21ZrQH143K4CTb63EaMxja1YiTnSEWKMbn23uoEnAzxjdUJRQkazCAtzxGm4LSoTSVTptoV9RbchnKPW9HxKtZumdyxyikZFDLhogJ5Uj/44'/0'/0'/0/*)";
+        let public_descriptor = "wpkh([a12b02f4/44'/0'/0']xpub6BzhLAQUDcBUfHRQHZxDF2AbcJqp4Kaeq6bzJpXrjrWuK26ymTFwkEFbxPra2bJ7yeZKbDjfDeFwxe93JMqpo5SsPJH6dZdvV9kMzJkAZ69/0/*)";
+
         let change_descriptor = "wpkh(xprv9s21ZrQH143K4CTb63EaMxja1YiTnSEWKMbn23uoEnAzxjdUJRQkazCAtzxGm4LSoTSVTptoV9RbchnKPW9HxKtZumdyxyikZFDLhogJ5Uj/44'/0'/0'/1/*)";
 
         let wallet = get_test_wallet(descriptor, change_descriptor, Network::Bitcoin);
         let export = FullyNodedExport::export_wallet(&wallet, "Test Label", true).unwrap();
 
-        assert_eq!(export.to_string(), "{\"descriptor\":\"wpkh(xprv9s21ZrQH143K4CTb63EaMxja1YiTnSEWKMbn23uoEnAzxjdUJRQkazCAtzxGm4LSoTSVTptoV9RbchnKPW9HxKtZumdyxyikZFDLhogJ5Uj/44\'/0\'/0\'/0/*)\",\"blockheight\":5000,\"label\":\"Test Label\"}");
+        assert_eq!(export.to_string(), format!("{{\"descriptor\":\"{public_descriptor}\",\"blockheight\":5000,\"label\":\"Test Label\"}}"));
     }
 
     #[test]

wallet/src/wallet/mod.rs

@@ -34,19 +34,11 @@ use bdk_chain::{
     FullTxOut, Indexed, IndexedTxGraph, Indexer, Merge,
 };
 use bitcoin::{
-    absolute,
-    consensus::encode::serialize,
-    constants::genesis_block,
-    psbt,
-    secp256k1::Secp256k1,
-    sighash::{EcdsaSighashType, TapSighashType},
+    absolute, consensus::encode::serialize, constants::genesis_block, psbt, secp256k1::Secp256k1,
     transaction, Address, Amount, Block, BlockHash, FeeRate, Network, OutPoint, Psbt, ScriptBuf,
     Sequence, SignedAmount, Transaction, TxOut, Txid, Weight, Witness,
 };
-use miniscript::{
-    descriptor::KeyMap,
-    psbt::{PsbtExt, PsbtInputExt, PsbtInputSatisfier},
-};
+use miniscript::psbt::{PsbtExt, PsbtInputExt, PsbtInputSatisfier};
 use rand_core::RngCore;
 
 mod changeset;
@@ -70,7 +62,7 @@ use crate::types::*;
 use crate::wallet::{
     coin_selection::{DefaultCoinSelectionAlgorithm, Excess, InsufficientFunds},
     error::{BuildFeeBumpError, CreateTxError, MiniscriptPsbtError},
-    signer::{SignOptions, SignerError, SignerOrdering, SignersContainer, TransactionSigner},
+    signer::{SignOptions, SignerError, SignersContainer},
     tx_builder::{FeePolicy, TxBuilder, TxParams},
     utils::{check_nsequence_rbf, After, Older, SecpCtx},
 };
@@ -417,22 +409,14 @@ impl Wallet {
         check_wallet_descriptor(&descriptor)?;
         descriptor_keymap.extend(params.descriptor_keymap);
 
-        let signers = Arc::new(SignersContainer::build(
-            descriptor_keymap,
-            &descriptor,
-            &secp,
-        ));
+        let signers = Arc::new(SignersContainer::new());
 
         let (change_descriptor, change_signers) = match params.change_descriptor {
             Some(make_desc) => {
                 let (change_descriptor, mut internal_keymap) = make_desc(&secp, network)?;
                 check_wallet_descriptor(&change_descriptor)?;
                 internal_keymap.extend(params.change_descriptor_keymap);
-                let change_signers = Arc::new(SignersContainer::build(
-                    internal_keymap,
-                    &change_descriptor,
-                    &secp,
-                ));
+                let change_signers = Arc::new(SignersContainer::new());
                 (Some(change_descriptor), change_signers)
             }
             None => (None, Arc::new(SignersContainer::new())),
@@ -580,7 +564,7 @@ impl Wallet {
                 }));
             }
         }
-        let signers = Arc::new(SignersContainer::build(external_keymap, &descriptor, &secp));
+        let signers = Arc::new(SignersContainer::new());
 
         let mut change_descriptor = None;
         let mut internal_keymap = params.change_descriptor_keymap;
@@ -634,11 +618,7 @@ impl Wallet {
         }
 
         let change_signers = match change_descriptor {
-            Some(ref change_descriptor) => Arc::new(SignersContainer::build(
-                internal_keymap,
-                change_descriptor,
-                &secp,
-            )),
+            Some(ref change_descriptor) => Arc::new(SignersContainer::new()),
             None => Arc::new(SignersContainer::new()),
         };
 
@@ -1207,70 +1187,6 @@ impl Wallet {
         )
     }
 
-    /// Add an external signer
-    ///
-    /// See [the `signer` module](signer) for an example.
-    pub fn add_signer(
-        &mut self,
-        keychain: KeychainKind,
-        ordering: SignerOrdering,
-        signer: Arc<dyn TransactionSigner>,
-    ) {
-        let signers = match keychain {
-            KeychainKind::External => Arc::make_mut(&mut self.signers),
-            KeychainKind::Internal => Arc::make_mut(&mut self.change_signers),
-        };
-
-        signers.add_external(signer.id(&self.secp), ordering, signer);
-    }
-
-    /// Set the keymap for a given keychain.
-    ///
-    /// Note this does nothing if the given keychain has no descriptor because we won't
-    /// know the context (segwit, taproot, etc) in which to create signatures.
-    pub fn set_keymap(&mut self, keychain: KeychainKind, keymap: KeyMap) {
-        let wallet_signers = match keychain {
-            KeychainKind::External => Arc::make_mut(&mut self.signers),
-            KeychainKind::Internal => Arc::make_mut(&mut self.change_signers),
-        };
-        if let Some(descriptor) = self.indexed_graph.index.get_descriptor(keychain) {
-            *wallet_signers = SignersContainer::build(keymap, descriptor, &self.secp)
-        }
-    }
-
-    /// Set the keymap for each keychain.
-    pub fn set_keymaps(&mut self, keymaps: impl IntoIterator<Item = (KeychainKind, KeyMap)>) {
-        for (keychain, keymap) in keymaps {
-            self.set_keymap(keychain, keymap);
-        }
-    }
-
-    /// Get the signers
-    ///
-    /// ## Example
-    ///
-    /// ```
-    /// # use bdk_wallet::{Wallet, KeychainKind};
-    /// # use bdk_wallet::bitcoin::Network;
-    /// let descriptor = "wpkh(tprv8ZgxMBicQKsPe73PBRSmNbTfbcsZnwWhz5eVmhHpi31HW29Z7mc9B4cWGRQzopNUzZUT391DeDJxL2PefNunWyLgqCKRMDkU1s2s8bAfoSk/84'/1'/0'/0/*)";
-    /// let change_descriptor = "wpkh(tprv8ZgxMBicQKsPe73PBRSmNbTfbcsZnwWhz5eVmhHpi31HW29Z7mc9B4cWGRQzopNUzZUT391DeDJxL2PefNunWyLgqCKRMDkU1s2s8bAfoSk/84'/1'/0'/1/*)";
-    /// let wallet = Wallet::create(descriptor, change_descriptor)
-    ///     .network(Network::Testnet)
-    ///     .create_wallet_no_persist()?;
-    /// for secret_key in wallet.get_signers(KeychainKind::External).signers().iter().filter_map(|s| s.descriptor_secret_key()) {
-    ///     // secret_key: tprv8ZgxMBicQKsPe73PBRSmNbTfbcsZnwWhz5eVmhHpi31HW29Z7mc9B4cWGRQzopNUzZUT391DeDJxL2PefNunWyLgqCKRMDkU1s2s8bAfoSk/84'/0'/0'/0/*
-    ///     println!("secret_key: {}", secret_key);
-    /// }
-    ///
-    /// Ok::<(), Box<dyn std::error::Error>>(())
-    /// ```
-    pub fn get_signers(&self, keychain: KeychainKind) -> Arc<SignersContainer> {
-        match keychain {
-            KeychainKind::External => Arc::clone(&self.signers),
-            KeychainKind::Internal => Arc::clone(&self.change_signers),
-        }
-    }
-
     /// Start building a transaction.
     ///
     /// This returns a blank [`TxBuilder`] from which you can specify the parameters for the
@@ -1657,7 +1573,8 @@ impl Wallet {
     ///         .add_recipient(to_address.script_pubkey(), Amount::from_sat(50_000));
     ///     builder.finish()?
     /// };
-    /// let _ = wallet.sign(&mut psbt, SignOptions::default())?;
+    /// // FIXME: (@leonardo) should use the `psbt.sign` instead!
+    /// // let _ = wallet.sign(&mut psbt, SignOptions::default())?;
     /// let tx = psbt.clone().extract_tx().expect("tx");
     /// // broadcast tx but it's taking too long to confirm so we want to bump the fee
     /// let mut psbt =  {
@@ -1667,7 +1584,8 @@ impl Wallet {
     ///     builder.finish()?
     /// };
     ///
-    /// let _ = wallet.sign(&mut psbt, SignOptions::default())?;
+    /// // FIXME: (@leonardo) should use the `psbt.sign` instead!
+    /// // let _ = wallet.sign(&mut psbt, SignOptions::default())?;
     /// let fee_bumped_tx = psbt.extract_tx();
     /// // broadcast fee_bumped_tx to replace original
     /// # Ok::<(), anyhow::Error>(())
@@ -1827,83 +1745,6 @@ impl Wallet {
         })
     }
 
-    /// Sign a transaction with all the wallet's signers, in the order specified by every signer's
-    /// [`SignerOrdering`]. This function returns the `Result` type with an encapsulated `bool` that
-    /// has the value true if the PSBT was finalized, or false otherwise.
-    ///
-    /// The [`SignOptions`] can be used to tweak the behavior of the software signers, and the way
-    /// the transaction is finalized at the end. Note that it can't be guaranteed that *every*
-    /// signers will follow the options, but the "software signers" (WIF keys and `xprv`) defined
-    /// in this library will.
-    ///
-    /// ## Example
-    ///
-    /// ```
-    /// # use std::str::FromStr;
-    /// # use bitcoin::*;
-    /// # use bdk_wallet::*;
-    /// # use bdk_wallet::ChangeSet;
-    /// # use bdk_wallet::error::CreateTxError;
-    /// # let descriptor = "wpkh(tpubD6NzVbkrYhZ4Xferm7Pz4VnjdcDPFyjVu5K4iZXQ4pVN8Cks4pHVowTBXBKRhX64pkRyJZJN5xAKj4UDNnLPb5p2sSKXhewoYx5GbTdUFWq/*)";
-    /// # let mut wallet = doctest_wallet!();
-    /// # let to_address = Address::from_str("2N4eQYCbKUHCCTUjBJeHcJp9ok6J2GZsTDt").unwrap().assume_checked();
-    /// let mut psbt = {
-    ///     let mut builder = wallet.build_tx();
-    ///     builder.add_recipient(to_address.script_pubkey(), Amount::from_sat(50_000));
-    ///     builder.finish()?
-    /// };
-    /// let finalized = wallet.sign(&mut psbt, SignOptions::default())?;
-    /// assert!(finalized, "we should have signed all the inputs");
-    /// # Ok::<(),anyhow::Error>(())
-    pub fn sign(&self, psbt: &mut Psbt, sign_options: SignOptions) -> Result<bool, SignerError> {
-        // This adds all the PSBT metadata for the inputs, which will help us later figure out how
-        // to derive our keys
-        self.update_psbt_with_descriptor(psbt)
-            .map_err(SignerError::MiniscriptPsbt)?;
-
-        // If we aren't allowed to use `witness_utxo`, ensure that every input (except p2tr and
-        // finalized ones) has the `non_witness_utxo`
-        if !sign_options.trust_witness_utxo
-            && psbt
-                .inputs
-                .iter()
-                .filter(|i| i.final_script_witness.is_none() && i.final_script_sig.is_none())
-                .filter(|i| i.tap_internal_key.is_none() && i.tap_merkle_root.is_none())
-                .any(|i| i.non_witness_utxo.is_none())
-        {
-            return Err(SignerError::MissingNonWitnessUtxo);
-        }
-
-        // If the user hasn't explicitly opted-in, refuse to sign the transaction unless every input
-        // is using `SIGHASH_ALL` or `SIGHASH_DEFAULT` for taproot
-        if !sign_options.allow_all_sighashes
-            && !psbt.inputs.iter().all(|i| {
-                i.sighash_type.is_none()
-                    || i.sighash_type == Some(EcdsaSighashType::All.into())
-                    || i.sighash_type == Some(TapSighashType::All.into())
-                    || i.sighash_type == Some(TapSighashType::Default.into())
-            })
-        {
-            return Err(SignerError::NonStandardSighash);
-        }
-
-        for signer in self
-            .signers
-            .signers()
-            .iter()
-            .chain(self.change_signers.signers().iter())
-        {
-            signer.sign_transaction(psbt, &sign_options, &self.secp)?;
-        }
-
-        // attempt to finalize
-        if sign_options.try_finalize {
-            self.finalize_psbt(psbt, sign_options)
-        } else {
-            Ok(false)
-        }
-    }
-
     /// Return the spending policies for the wallet's descriptor
     pub fn policies(&self, keychain: KeychainKind) -> Result<Option<Policy>, DescriptorError> {
         let signers = match keychain {

wallet/src/wallet/signer.rs

@@ -72,11 +72,12 @@
 //! let mut wallet = Wallet::create(descriptor, change_descriptor)
 //!     .network(Network::Testnet)
 //!     .create_wallet_no_persist()?;
-//! wallet.add_signer(
-//!     KeychainKind::External,
-//!     SignerOrdering(200),
-//!     Arc::new(custom_signer)
-//! );
+//! // FIXME: (@leonardo) should be removed ?
+//! // wallet.add_signer(
+//! //     KeychainKind::External,
+//! //     SignerOrdering(200),
+//! //     Arc::new(custom_signer)
+//! // );
 //!
 //! # Ok::<_, anyhow::Error>(())
 //! ```