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// Copyright (c) 2018-2019 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_SCRIPT_DESCRIPTOR_H
#define BITCOIN_SCRIPT_DESCRIPTOR_H
#include <script/script.h>
#include <script/sign.h>
#include <script/signingprovider.h>
#include <vector>
/** \brief Interface for parsed descriptor objects.
*
* Descriptors are strings that describe a set of scriptPubKeys, together with
* all information necessary to solve them. By combining all information into
* one, they avoid the need to separately import keys and scripts.
*
* Descriptors may be ranged, which occurs when the public keys inside are
* specified in the form of HD chains (xpubs).
*
* Descriptors always represent public information - public keys and scripts -
* but in cases where private keys need to be conveyed along with a descriptor,
* they can be included inside by changing public keys to private keys (WIF
* format), and changing xpubs by xprvs.
*
* Reference documentation about the descriptor language can be found in
* doc/descriptors.md.
*/
struct Descriptor {
virtual ~Descriptor() = default;
/** Whether the expansion of this descriptor depends on the position. */
virtual bool IsRange() const = 0;
/** Whether this descriptor has all information about signing ignoring lack of private keys.
* This is true for all descriptors except ones that use `raw` or `addr` constructions. */
virtual bool IsSolvable() const = 0;
/** Convert the descriptor back to a string, undoing parsing. */
virtual std::string ToString() const = 0;
/** Convert the descriptor to a private string. This fails if the provided provider does not have the relevant private keys. */
virtual bool ToPrivateString(const SigningProvider& provider, std::string& out) const = 0;
/** Expand a descriptor at a specified position.
*
* @param[in] pos The position at which to expand the descriptor. If IsRange() is false, this is ignored.
* @param[in] provider The provider to query for private keys in case of hardened derivation.
* @param[out] output_scripts The expanded scriptPubKeys.
* @param[out] out Scripts and public keys necessary for solving the expanded scriptPubKeys (may be equal to `provider`).
* @param[out] cache Cache data necessary to evaluate the descriptor at this point without access to private keys.
*/
virtual bool Expand(int pos, const SigningProvider& provider, std::vector<CScript>& output_scripts, FlatSigningProvider& out, std::vector<unsigned char>* cache = nullptr) const = 0;
/** Expand a descriptor at a specified position using cached expansion data.
*
* @param[in] pos The position at which to expand the descriptor. If IsRange() is false, this is ignored.
* @param[in] cache Cached expansion data.
* @param[out] output_scripts The expanded scriptPubKeys.
* @param[out] out Scripts and public keys necessary for solving the expanded scriptPubKeys (may be equal to `provider`).
*/
virtual bool ExpandFromCache(int pos, const std::vector<unsigned char>& cache, std::vector<CScript>& output_scripts, FlatSigningProvider& out) const = 0;
/** Expand the private key for a descriptor at a specified position, if possible.
*
* @param[in] pos The position at which to expand the descriptor. If IsRange() is false, this is ignored.
* @param[in] provider The provider to query for the private keys.
* @param[out] out Any private keys available for the specified `pos`.
*/
virtual void ExpandPrivate(int pos, const SigningProvider& provider, FlatSigningProvider& out) const = 0;
};
/** Parse a `descriptor` string. Included private keys are put in `out`.
*
* If the descriptor has a checksum, it must be valid. If `require_checksum`
* is set, the checksum is mandatory - otherwise it is optional.
*
* If a parse error occurs, or the checksum is missing/invalid, or anything
* else is wrong, `nullptr` is returned.
*/
std::unique_ptr<Descriptor> Parse(const std::string& descriptor, FlatSigningProvider& out, std::string& error, bool require_checksum = false);
/** Get the checksum for a `descriptor`.
*
* - If it already has one, and it is correct, return the checksum in the input.
* - If it already has one that is wrong, return "".
* - If it does not already have one, return the checksum that would need to be added.
*/
std::string GetDescriptorChecksum(const std::string& descriptor);
/** Find a descriptor for the specified `script`, using information from `provider` where possible.
*
* A non-ranged descriptor which only generates the specified script will be returned in all
* circumstances.
*
* For public keys with key origin information, this information will be preserved in the returned
* descriptor.
*
* - If all information for solving `script` is present in `provider`, a descriptor will be returned
* which is IsSolvable() and encapsulates said information.
* - Failing that, if `script` corresponds to a known address type, an "addr()" descriptor will be
* returned (which is not IsSolvable()).
* - Failing that, a "raw()" descriptor is returned.
*/
std::unique_ptr<Descriptor> InferDescriptor(const CScript& script, const SigningProvider& provider);
#endif // BITCOIN_SCRIPT_DESCRIPTOR_H
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