Branch data     Line data    Source code

       1                 :            : // Copyright (c) 2020-2022 The Bitcoin Core developers
       2                 :            : // Distributed under the MIT software license, see the accompanying
       3                 :            : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       4                 :            : 
       5                 :            : #include <chainparams.h>
       6                 :            : #include <common/args.h>
       7                 :            : #include <common/system.h>
       8                 :            : #include <external_signer.h>
       9                 :            : #include <wallet/external_signer_scriptpubkeyman.h>
      10                 :            : 
      11                 :            : #include <iostream>
      12                 :            : #include <memory>
      13                 :            : #include <stdexcept>
      14                 :            : #include <string>
      15                 :            : #include <utility>
      16                 :            : #include <vector>
      17                 :            : 
      18                 :            : namespace wallet {
      19                 :          0 : bool ExternalSignerScriptPubKeyMan::SetupDescriptor(WalletBatch& batch, std::unique_ptr<Descriptor> desc)
      20                 :            : {
      21                 :          0 :     LOCK(cs_desc_man);
      22 [ #  # ][ #  # ]:          0 :     assert(m_storage.IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
      23 [ #  # ][ #  # ]:          0 :     assert(m_storage.IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER));
      24                 :            : 
      25         [ #  # ]:          0 :     int64_t creation_time = GetTime();
      26                 :            : 
      27                 :          2 :     // Make the descriptor
      28 [ #  # ][ #  # ]:          0 :     WalletDescriptor w_desc(std::move(desc), creation_time, 0, 0, 0);
      29         [ #  # ]:          0 :     m_wallet_descriptor = w_desc;
      30                 :            : 
      31                 :            :     // Store the descriptor
      32 [ #  # ][ #  # ]:          0 :     if (!batch.WriteDescriptor(GetID(), m_wallet_descriptor)) {
                 [ #  # ]
      33 [ #  # ][ #  # ]:          0 :         throw std::runtime_error(std::string(__func__) + ": writing descriptor failed");
         [ #  # ][ #  # ]
                 [ #  # ]
      34                 :            :     }
      35                 :            : 
      36                 :            :     // TopUp
      37         [ #  # ]:          0 :     TopUpWithDB(batch);
      38                 :            : 
      39         [ #  # ]:          0 :     m_storage.UnsetBlankWalletFlag(batch);
      40                 :            :     return true;
      41                 :          0 : }
      42                 :            : 
      43                 :          0 : ExternalSigner ExternalSignerScriptPubKeyMan::GetExternalSigner() {
      44 [ #  # ][ #  # ]:          0 :     const std::string command = gArgs.GetArg("-signer", "");
                 [ #  # ]
      45 [ #  # ][ #  # ]:          0 :     if (command == "") throw std::runtime_error(std::string(__func__) + ": restart bitcoind with -signer=<cmd>");
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
      46                 :          0 :     std::vector<ExternalSigner> signers;
      47 [ #  # ][ #  # ]:          0 :     ExternalSigner::Enumerate(command, signers, Params().GetChainTypeString());
                 [ #  # ]
      48 [ #  # ][ #  # ]:          0 :     if (signers.empty()) throw std::runtime_error(std::string(__func__) + ": No external signers found");
         [ #  # ][ #  # ]
                 [ #  # ]
      49                 :            :     // TODO: add fingerprint argument instead of failing in case of multiple signers.
      50 [ #  # ][ #  # ]:          0 :     if (signers.size() > 1) throw std::runtime_error(std::string(__func__) + ": More than one external signer found. Please connect only one at a time.");
         [ #  # ][ #  # ]
                 [ #  # ]
      51         [ #  # ]:          0 :     return signers[0];
      52                 :          0 : }
      53                 :            : 
      54                 :          0 : bool ExternalSignerScriptPubKeyMan::DisplayAddress(const CScript scriptPubKey, const ExternalSigner &signer) const
      55                 :            : {
      56                 :            :     // TODO: avoid the need to infer a descriptor from inside a descriptor wallet
      57                 :          0 :     auto provider = GetSolvingProvider(scriptPubKey);
      58         [ #  # ]:          0 :     auto descriptor = InferDescriptor(scriptPubKey, *provider);
      59                 :            : 
      60 [ #  # ][ #  # ]:          0 :     signer.DisplayAddress(descriptor->ToString());
      61                 :            :     // TODO inspect result
      62                 :            :     return true;
      63                 :          0 : }
      64                 :            : 
      65                 :            : // If sign is true, transaction must previously have been filled
      66                 :          0 : TransactionError ExternalSignerScriptPubKeyMan::FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type, bool sign, bool bip32derivs, int* n_signed, bool finalize) const
      67                 :            : {
      68         [ #  # ]:          0 :     if (!sign) {
      69                 :          0 :         return DescriptorScriptPubKeyMan::FillPSBT(psbt, txdata, sighash_type, false, bip32derivs, n_signed, finalize);
      70                 :            :     }
      71                 :            : 
      72                 :            :     // Already complete if every input is now signed
      73                 :          0 :     bool complete = true;
      74         [ #  # ]:          0 :     for (const auto& input : psbt.inputs) {
      75                 :            :         // TODO: for multisig wallets, we should only care if all _our_ inputs are signed
      76                 :          0 :         complete &= PSBTInputSigned(input);
      77                 :            :     }
      78         [ #  # ]:          0 :     if (complete) return TransactionError::OK;
      79                 :            : 
      80                 :          0 :     std::string strFailReason;
      81 [ #  # ][ #  # ]:          0 :     if(!GetExternalSigner().SignTransaction(psbt, strFailReason)) {
                 [ #  # ]
      82         [ #  # ]:          0 :         tfm::format(std::cerr, "Failed to sign: %s\n", strFailReason);
      83                 :          0 :         return TransactionError::EXTERNAL_SIGNER_FAILED;
      84                 :            :     }
      85 [ #  # ][ #  # ]:          0 :     if (finalize) FinalizePSBT(psbt); // This won't work in a multisig setup
      86                 :          0 :     return TransactionError::OK;
      87                 :          0 : }
      88                 :            : } // namespace wallet