util.h

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// Copyright (c) 2017-present 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_RPC_UTIL_H
#define BITCOIN_RPC_UTIL_H

#include <addresstype.h>
#include <consensus/amount.h>
#include <node/transaction.h>
#include <outputtype.h>
#include <pubkey.h>
#include <rpc/protocol.h>
#include <rpc/request.h>
#include <script/script.h>
#include <script/sign.h>
#include <uint256.h>
#include <univalue.h>
#include <util/check.h>

#include <cstddef>
#include <cstdint>
#include <functional>
#include <initializer_list>
#include <map>
#include <optional>
#include <string>
#include <string_view>
#include <type_traits>
#include <utility>
#include <variant>
#include <vector>

class JSONRPCRequest;
enum ServiceFlags : uint64_t;
enum class OutputType;
struct FlatSigningProvider;
struct bilingual_str;
namespace common {
enum class PSBTError;
} // namespace common
namespace node {
enum class TransactionError;
} // namespace node

static constexpr bool DEFAULT_RPC_DOC_CHECK{
#ifdef RPC_DOC_CHECK
    true
#else
    false
#endif
};

extern const std::string UNIX_EPOCH_TIME;

extern const std::string EXAMPLE_ADDRESS[2];

class FillableSigningProvider;
class CScript;
struct Sections;

struct HelpResult : std::runtime_error {
    explicit HelpResult(const std::string& msg) : std::runtime_error{msg} {}
};

std::string GetAllOutputTypes();

struct UniValueType {
    UniValueType(UniValue::VType _type) : typeAny(false), type(_type) {}
    UniValueType() : typeAny(true) {}
    bool typeAny;
    UniValue::VType type;
};

/*
  Check for expected keys/value types in an Object.
*/
void RPCTypeCheckObj(const UniValue& o,
    const std::map<std::string, UniValueType>& typesExpected,
    bool fAllowNull = false,
    bool fStrict = false);

uint256 ParseHashV(const UniValue& v, std::string_view name);
uint256 ParseHashO(const UniValue& o, std::string_view strKey);
std::vector<unsigned char> ParseHexV(const UniValue& v, std::string_view name);
std::vector<unsigned char> ParseHexO(const UniValue& o, std::string_view strKey);

int ParseVerbosity(const UniValue& arg, int default_verbosity, bool allow_bool);

CAmount AmountFromValue(const UniValue& value, int decimals = 8);
CFeeRate ParseFeeRate(const UniValue& json);

using RPCArgList = std::vector<std::pair<std::string, UniValue>>;
std::string HelpExampleCli(const std::string& methodname, const std::string& args);
std::string HelpExampleCliNamed(const std::string& methodname, const RPCArgList& args);
std::string HelpExampleRpc(const std::string& methodname, const std::string& args);
std::string HelpExampleRpcNamed(const std::string& methodname, const RPCArgList& args);

CPubKey HexToPubKey(const std::string& hex_in);
CTxDestination AddAndGetMultisigDestination(int required, const std::vector<CPubKey>& pubkeys, OutputType type, FlatSigningProvider& keystore, CScript& script_out);

UniValue DescribeAddress(const CTxDestination& dest);

std::optional<int> ParseSighashString(const UniValue& sighash);

unsigned int ParseConfirmTarget(const UniValue& value, unsigned int max_target);

RPCErrorCode RPCErrorFromTransactionError(node::TransactionError terr);
UniValue JSONRPCPSBTError(common::PSBTError err);
UniValue JSONRPCTransactionError(node::TransactionError terr, const std::string& err_string = "");

std::pair<int64_t, int64_t> ParseDescriptorRange(const UniValue& value);

std::vector<CScript> EvalDescriptorStringOrObject(const UniValue& scanobject, FlatSigningProvider& provider, bool expand_priv = false);

enum class OuterType {
    ARR,
    OBJ,
    NONE, // Only set on first recursion
};

struct RPCArgOptions {
    bool skip_type_check{false};
    std::string oneline_description{};   
    std::vector<std::string> type_str{}; 
    bool hidden{false};                  
    bool also_positional{false};         
};

// NOLINTNEXTLINE(misc-no-recursion)
struct RPCArg {
    enum class Type {
        OBJ,
        ARR,
        STR,
        NUM,
        BOOL,
        OBJ_NAMED_PARAMS, 
        OBJ_USER_KEYS, 
        AMOUNT,        
        STR_HEX,       
        RANGE,         
    };

    enum class Optional {
        NO,
        OMITTED,
    };
    using DefaultHint = std::string;
    using Default = UniValue;
    using Fallback = std::variant<Optional, DefaultHint, Default>;

    const std::string m_names; 
    const Type m_type;
    const std::vector<RPCArg> m_inner; 
    const Fallback m_fallback;
    const std::string m_description;
    const RPCArgOptions m_opts;

    RPCArg(
        std::string name,
        Type type,
        Fallback fallback,
        std::string description,
        RPCArgOptions opts = {})
        : m_names{std::move(name)},
          m_type{std::move(type)},
          m_fallback{std::move(fallback)},
          m_description{std::move(description)},
          m_opts{std::move(opts)}
    {
        CHECK_NONFATAL(type != Type::ARR && type != Type::OBJ && type != Type::OBJ_NAMED_PARAMS && type != Type::OBJ_USER_KEYS);
    }

    RPCArg(
        std::string name,
        Type type,
        Fallback fallback,
        std::string description,
        std::vector<RPCArg> inner,
        RPCArgOptions opts = {})
        : m_names{std::move(name)},
          m_type{std::move(type)},
          m_inner{std::move(inner)},
          m_fallback{std::move(fallback)},
          m_description{std::move(description)},
          m_opts{std::move(opts)}
    {
        CHECK_NONFATAL(type == Type::ARR || type == Type::OBJ || type == Type::OBJ_NAMED_PARAMS || type == Type::OBJ_USER_KEYS);
    }

    bool IsOptional() const;

    UniValue MatchesType(const UniValue& request) const;

    std::string GetFirstName() const;

    std::string GetName() const;

    std::string ToString(bool oneline) const;
    std::string ToStringObj(bool oneline) const;
    std::string ToDescriptionString(bool is_named_arg) const;
};

// NOLINTNEXTLINE(misc-no-recursion)
struct RPCResult {
    enum class Type {
        OBJ,
        ARR,
        STR,
        NUM,
        BOOL,
        NONE,
        ANY,        
        STR_AMOUNT, 
        STR_HEX,    
        OBJ_DYN,    
        ARR_FIXED,  
        NUM_TIME,   
        ELISION,    
    };

    const Type m_type;
    const std::string m_key_name;         
    const std::vector<RPCResult> m_inner; 
    const bool m_optional;
    const bool m_skip_type_check;
    const std::string m_description;
    const std::string m_cond;

    RPCResult(
        std::string cond,
        Type type,
        std::string m_key_name,
        bool optional,
        std::string description,
        std::vector<RPCResult> inner = {})
        : m_type{std::move(type)},
          m_key_name{std::move(m_key_name)},
          m_inner{std::move(inner)},
          m_optional{optional},
          m_skip_type_check{false},
          m_description{std::move(description)},
          m_cond{std::move(cond)}
    {
        CHECK_NONFATAL(!m_cond.empty());
        CheckInnerDoc();
    }

    RPCResult(
        std::string cond,
        Type type,
        std::string m_key_name,
        std::string description,
        std::vector<RPCResult> inner = {})
        : RPCResult{std::move(cond), type, std::move(m_key_name), /*optional=*/false, std::move(description), std::move(inner)} {}

    RPCResult(
        Type type,
        std::string m_key_name,
        bool optional,
        std::string description,
        std::vector<RPCResult> inner = {},
        bool skip_type_check = false)
        : m_type{std::move(type)},
          m_key_name{std::move(m_key_name)},
          m_inner{std::move(inner)},
          m_optional{optional},
          m_skip_type_check{skip_type_check},
          m_description{std::move(description)},
          m_cond{}
    {
        CheckInnerDoc();
    }

    RPCResult(
        Type type,
        std::string m_key_name,
        std::string description,
        std::vector<RPCResult> inner = {},
        bool skip_type_check = false)
        : RPCResult{type, std::move(m_key_name), /*optional=*/false, std::move(description), std::move(inner), skip_type_check} {}

    void ToSections(Sections& sections, OuterType outer_type = OuterType::NONE, int current_indent = 0) const;
    std::string ToStringObj() const;
    std::string ToDescriptionString() const;
    UniValue MatchesType(const UniValue& result) const;

private:
    void CheckInnerDoc() const;
};

struct RPCResults {
    const std::vector<RPCResult> m_results;

    RPCResults(RPCResult result)
        : m_results{{result}}
    {
    }

    RPCResults(std::initializer_list<RPCResult> results)
        : m_results{results}
    {
    }

    std::string ToDescriptionString() const;
};

struct RPCExamples {
    const std::string m_examples;
    explicit RPCExamples(
        std::string examples)
        : m_examples(std::move(examples))
    {
    }
    std::string ToDescriptionString() const;
};

class RPCHelpMan
{
public:
    RPCHelpMan(std::string name, std::string description, std::vector<RPCArg> args, RPCResults results, RPCExamples examples);
    using RPCMethodImpl = std::function<UniValue(const RPCHelpMan&, const JSONRPCRequest&)>;
    RPCHelpMan(std::string name, std::string description, std::vector<RPCArg> args, RPCResults results, RPCExamples examples, RPCMethodImpl fun);

    UniValue HandleRequest(const JSONRPCRequest& request) const;
    template <typename R>
    auto Arg(std::string_view key) const
    {
        auto i{GetParamIndex(key)};
        // Return argument (required or with default value).
        if constexpr (std::is_trivially_copyable_v<R>) {
            // Return trivially copyable types by value.
            return ArgValue<R>(i);
        } else {
            // Return everything else by reference.
            return ArgValue<const R&>(i);
        }
    }
    template <typename R>
    auto MaybeArg(std::string_view key) const
    {
        auto i{GetParamIndex(key)};
        // Return optional argument (without default).
        if constexpr (std::is_trivially_copyable_v<R>) {
            // Return trivially copyable types by value, wrapped in optional.
            return ArgValue<std::optional<R>>(i);
        } else {
            // Return other types by pointer.
            return ArgValue<const R*>(i);
        }
    }
    std::string ToString() const;
    UniValue GetArgMap() const;
    bool IsValidNumArgs(size_t num_args) const;
    std::vector<std::pair<std::string, bool>> GetArgNames() const;

    const std::string m_name;

private:
    const RPCMethodImpl m_fun;
    const std::string m_description;
    const std::vector<RPCArg> m_args;
    const RPCResults m_results;
    const RPCExamples m_examples;
    mutable const JSONRPCRequest* m_req{nullptr}; // A pointer to the request for the duration of m_fun()
    template <typename R>
    R ArgValue(size_t i) const;
    size_t GetParamIndex(std::string_view key) const;
};

void PushWarnings(const UniValue& warnings, UniValue& obj);
void PushWarnings(const std::vector<bilingual_str>& warnings, UniValue& obj);

std::vector<RPCResult> ScriptPubKeyDoc();

/***
 * Get the target for a given block index.
 *
 * @param[in] blockindex    the block
 * @param[in] pow_limit     PoW limit (consensus parameter)
 *
 * @return  the target
 */
uint256 GetTarget(const CBlockIndex& blockindex, uint256 pow_limit);

#endif // BITCOIN_RPC_UTIL_H