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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
// The Solver functions are used by policy and the wallet, but not consensus.
#ifndef BITCOIN_SCRIPT_SOLVER_H
#define BITCOIN_SCRIPT_SOLVER_H
#include <attributes.h>
#include <script/script.h>
#include <string>
#include <optional>
#include <utility>
#include <vector>
class CPubKey;
template <typename C> class Span;
enum class TxoutType {
NONSTANDARD,
// 'standard' transaction types:
PUBKEY,
PUBKEYHASH,
SCRIPTHASH,
MULTISIG,
NULL_DATA, //!< unspendable OP_RETURN script that carries data
WITNESS_V0_SCRIPTHASH,
WITNESS_V0_KEYHASH,
WITNESS_V1_TAPROOT,
WITNESS_UNKNOWN, //!< Only for Witness versions not already defined above
};
/** Get the name of a TxoutType as a string */
std::string GetTxnOutputType(TxoutType t);
constexpr bool IsPushdataOp(opcodetype opcode)
{
return opcode > OP_FALSE && opcode <= OP_PUSHDATA4;
}
/**
* Parse a scriptPubKey and identify script type for standard scripts. If
* successful, returns script type and parsed pubkeys or hashes, depending on
* the type. For example, for a P2SH script, vSolutionsRet will contain the
* script hash, for P2PKH it will contain the key hash, etc.
*
* @param[in] scriptPubKey Script to parse
* @param[out] vSolutionsRet Vector of parsed pubkeys and hashes
* @return The script type. TxoutType::NONSTANDARD represents a failed solve.
*/
TxoutType Solver(const CScript& scriptPubKey, std::vector<std::vector<unsigned char>>& vSolutionsRet);
/** Generate a P2PK script for the given pubkey. */
CScript GetScriptForRawPubKey(const CPubKey& pubkey);
/** Determine if script is a "multi_a" script. Returns (threshold, keyspans) if so, and nullopt otherwise.
* The keyspans refer to bytes in the passed script. */
std::optional<std::pair<int, std::vector<Span<const unsigned char>>>> MatchMultiA(const CScript& script LIFETIMEBOUND);
/** Generate a multisig script. */
CScript GetScriptForMultisig(int nRequired, const std::vector<CPubKey>& keys);
#endif // BITCOIN_SCRIPT_SOLVER_H
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