Class CAffectedKeysVisitor

src/wallet/wallet.cpp:108–167

A class to identify which pubkeys a script and a keystore have in common. */

/** A class to identify which pubkeys a script and a keystore have in common. */
class CAffectedKeysVisitor : public boost::static_visitor<void> {
private:
    const CKeyStore &keystore;
    std::vector<CKeyID> &vKeys;

public:
    /**
     * @param[in] keystoreIn The CKeyStore that is queried for the presence of a pubkey.
     * @param[out] vKeysIn A vector to which a script's pubkey identifiers are appended if they are in the keystore.
     */
    CAffectedKeysVisitor(const CKeyStore &keystoreIn, std::vector<CKeyID> &vKeysIn) : keystore(keystoreIn), vKeys(vKeysIn) {}

    /**
     * Apply the visitor to each destination in a script, recursively to the redeemscript
     * in the case of p2sh destinations.
     * @param[in] script The CScript from which destinations are extracted.
     * @post Any CKeyIDs that script and keystore have in common are appended to the visitor's vKeys.
     */
    void Process(const CScript &script) {
        txnouttype type;
        std::vector<CTxDestination> vDest;
        int nRequired;
        if (ExtractDestinations(script, type, vDest, nRequired)) {
            for (const CTxDestination &dest : vDest)
                boost::apply_visitor(*this, dest);
        }
    }

    void operator()(const CKeyID &keyId) {
        if (keystore.HaveKey(keyId))
            vKeys.push_back(keyId);
    }

    void operator()(const CScriptID &scriptId) {
        CScript script;
        if (keystore.GetCScript(scriptId, script))
            Process(script);
    }

    void operator()(const WitnessV0ScriptHash& scriptID)
    {
        CScriptID id;
        CRIPEMD160().Write(scriptID.begin(), 32).Finalize(id.begin());
        CScript script;
        if (keystore.GetCScript(id, script)) {
            Process(script);
        }
    }

    void operator()(const WitnessV0KeyHash& keyid)
    {
        CKeyID id(keyid);
        if (keystore.HaveKey(id)) {
            vKeys.push_back(id);
        }
    }

    template<typename X>