be16f80abc
Any projects which want to use Hush code from now on will need to be licensed as GPLv3 or we will send the lawyers: https://www.softwarefreedom.org/ Notably, Komodo (KMD) is licensed as GPLv2 and is no longer compatible to receive code changes, without causing legal issues. MIT projects, such as Zcash, also cannot pull in changes from the Hush Full Node without permission from The Hush Developers, which may in some circumstances grant an MIT license on a case-by-case basis.
114 lines
3.2 KiB
C++
114 lines
3.2 KiB
C++
// Copyright (c) 2018 The Zcash developers
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// Copyright (c) 2019-2020 The Hush developers
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// Distributed under the GPLv3 software license, see the accompanying
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// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
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#ifndef TRANSACTION_BUILDER_H
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#define TRANSACTION_BUILDER_H
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#include "consensus/params.h"
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#include "keystore.h"
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#include "primitives/transaction.h"
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#include "script/script.h"
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#include "script/standard.h"
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#include "uint256.h"
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#include "zcash/Address.hpp"
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#include "zcash/IncrementalMerkleTree.hpp"
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#include "zcash/Note.hpp"
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#include "zcash/NoteEncryption.hpp"
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#include <boost/optional.hpp>
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struct SpendDescriptionInfo {
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libzcash::SaplingExpandedSpendingKey expsk;
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libzcash::SaplingNote note;
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uint256 alpha;
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uint256 anchor;
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SaplingWitness witness;
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SpendDescriptionInfo(
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libzcash::SaplingExpandedSpendingKey expsk,
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libzcash::SaplingNote note,
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uint256 anchor,
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SaplingWitness witness);
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};
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struct OutputDescriptionInfo {
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uint256 ovk;
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libzcash::SaplingNote note;
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std::array<unsigned char, ZC_MEMO_SIZE> memo;
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OutputDescriptionInfo(
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uint256 ovk,
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libzcash::SaplingNote note,
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std::array<unsigned char, ZC_MEMO_SIZE> memo) : ovk(ovk), note(note), memo(memo) {}
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};
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struct TransparentInputInfo {
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CScript scriptPubKey;
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CAmount value;
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TransparentInputInfo(
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CScript scriptPubKey,
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CAmount value) : scriptPubKey(scriptPubKey), value(value) {}
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};
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class TransactionBuilder
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{
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private:
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Consensus::Params consensusParams;
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int nHeight;
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const CKeyStore* keystore;
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CMutableTransaction mtx;
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CAmount fee = 10000;
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std::vector<SpendDescriptionInfo> spends;
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std::vector<OutputDescriptionInfo> outputs;
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std::vector<TransparentInputInfo> tIns;
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boost::optional<std::pair<uint256, libzcash::SaplingPaymentAddress>> zChangeAddr;
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boost::optional<CTxDestination> tChangeAddr;
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boost::optional<CScript> opReturn;
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bool AddOpRetLast(CScript &s);
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public:
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TransactionBuilder() {}
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TransactionBuilder(const Consensus::Params& consensusParams, int nHeight, CKeyStore* keyStore = nullptr);
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void SetFee(CAmount fee);
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// Returns false if the anchor does not match the anchor used by
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// previously-added Sapling spends.
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bool AddSaplingSpend(
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libzcash::SaplingExpandedSpendingKey expsk,
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libzcash::SaplingNote note,
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uint256 anchor,
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SaplingWitness witness);
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void AddSaplingOutput(
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uint256 ovk,
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libzcash::SaplingPaymentAddress to,
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CAmount value,
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std::array<unsigned char, ZC_MEMO_SIZE> memo = {{0}});
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// Assumes that the value correctly corresponds to the provided UTXO.
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void AddTransparentInput(COutPoint utxo, CScript scriptPubKey, CAmount value, uint32_t nSequence = 0xffffffff);
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bool AddTransparentOutput(CTxDestination& to, CAmount value);
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void AddOpRet(CScript &s);
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bool AddOpRetLast();
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void SendChangeTo(libzcash::SaplingPaymentAddress changeAddr, uint256 ovk);
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bool SendChangeTo(CTxDestination& changeAddr);
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void SetLockTime(uint32_t time) { this->mtx.nLockTime = time; }
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boost::optional<CTransaction> Build();
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};
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#endif /* TRANSACTION_BUILDER_H */
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