delegation.h

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// Copyright (c) 2020 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef BITCOIN_AVALANCHE_DELEGATION_H
#define BITCOIN_AVALANCHE_DELEGATION_H
 
#include <avalanche/delegationid.h>
#include <avalanche/proofid.h>
#include <key.h>
#include <pubkey.h>
#include <serialize.h>
 
#include <vector>
 
struct bilingual_str;
 
namespace avalanche {
 
constexpr size_t MAX_DELEGATION_LEVELS{20};
 
class DelegationState;
class Proof;
 
class Delegation {
    LimitedProofId limitedProofid;
    CPubKey proofMaster;
 
    DelegationId dgid;
    DelegationId computeDelegationId() const;
 
    struct Level {
        CPubKey pubkey;
        SchnorrSig sig;
 
        SERIALIZE_METHODS(Level, obj) { READWRITE(obj.pubkey, obj.sig); }
    };
 
    std::vector<Level> levels;
 
    friend class DelegationBuilder;
    Delegation(const LimitedProofId &limitedProofid_,
               const CPubKey &proofMaster_, const DelegationId &dgid_,
               std::vector<Level> levels_)
        : limitedProofid(limitedProofid_), proofMaster(proofMaster_),
          dgid(dgid_), levels(std::move(levels_)) {}
 
public:
    explicit Delegation() {}
 
    static bool FromHex(Delegation &dg, const std::string &dgHex,
                        bilingual_str &errorOut);
 
    const DelegationId &getId() const { return dgid; }
    const LimitedProofId &getLimitedProofId() const { return limitedProofid; }
    const CPubKey &getProofMaster() const { return proofMaster; }
    const CPubKey &getDelegatedPubkey() const;
    const std::vector<Level> &getLevels() const { return levels; }
 
    ProofId getProofId() const;
 
    SERIALIZE_METHODS(Delegation, obj) {
        READWRITE(obj.limitedProofid, obj.proofMaster, obj.levels);
        SER_READ(obj, obj.dgid = obj.computeDelegationId());
    }
 
    bool verify(DelegationState &state, CPubKey &auth) const;
};
 
} // namespace avalanche
 
#endif // BITCOIN_AVALANCHE_DELEGATION_H