descriptor.h

Go to the documentation of this file.

// Copyright (c) 2018-2020 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 <optional.h>
#include <outputtype.h>
#include <script/script.h>
#include <script/sign.h>
#include <script/signingprovider.h>

#include <vector>

using ExtPubKeyMap = std::unordered_map<uint32_t, CExtPubKey>;

class DescriptorCache {
private:
    std::unordered_map<uint32_t, ExtPubKeyMap> m_derived_xpubs;
    ExtPubKeyMap m_parent_xpubs;

public:
    void CacheParentExtPubKey(uint32_t key_exp_pos, const CExtPubKey& xpub);
    bool GetCachedParentExtPubKey(uint32_t key_exp_pos, CExtPubKey& xpub) const;
    void CacheDerivedExtPubKey(uint32_t key_exp_pos, uint32_t der_index, const CExtPubKey& xpub);
    bool GetCachedDerivedExtPubKey(uint32_t key_exp_pos, uint32_t der_index, CExtPubKey& xpub) const;

    const ExtPubKeyMap GetCachedParentExtPubKeys() const;
    const std::unordered_map<uint32_t, ExtPubKeyMap> GetCachedDerivedExtPubKeys() const;
};

struct Descriptor {
    virtual ~Descriptor() = default;

    virtual bool IsRange() const = 0;

    virtual bool IsSolvable() const = 0;

    virtual std::string ToString() const = 0;

    virtual bool IsSingleType() const = 0;

    virtual bool ToPrivateString(const SigningProvider& provider, std::string& out) const = 0;

    virtual bool Expand(int pos, const SigningProvider& provider, std::vector<CScript>& output_scripts, FlatSigningProvider& out, DescriptorCache* write_cache = nullptr) const = 0;

    virtual bool ExpandFromCache(int pos, const DescriptorCache& read_cache, std::vector<CScript>& output_scripts, FlatSigningProvider& out) const = 0;

    virtual void ExpandPrivate(int pos, const SigningProvider& provider, FlatSigningProvider& out) const = 0;

    virtual Optional<OutputType> GetOutputType() const = 0;
};

std::unique_ptr<Descriptor> Parse(const std::string& descriptor, FlatSigningProvider& out, std::string& error, bool require_checksum = false);

std::string GetDescriptorChecksum(const std::string& descriptor);

std::unique_ptr<Descriptor> InferDescriptor(const CScript& script, const SigningProvider& provider);

#endif // BITCOIN_SCRIPT_DESCRIPTOR_H