text: // Copyright (c) 2010 Satoshi Nakamoto
  // Copyright (c) 2009-2016 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "rpc/server.h"
  
  #include "base58.h"
  #include "fs.h"
  #include "init.h"
  #include "random.h"
  #include "sync.h"
  #include "ui_interface.h"
  #include "util.h"
  #include "utilstrencodings.h"
  
  #include <univalue.h>
  
  #include <boost/bind.hpp>
  #include <boost/signals2/signal.hpp>
  #include <boost/algorithm/string/case_conv.hpp> // for to_upper()
  #include <boost/algorithm/string/classification.hpp>
  #include <boost/algorithm/string/split.hpp>
  
  #include <memory> // for unique_ptr
  #include <unordered_map>
  
  static bool fRPCRunning = false;
  static bool fRPCInWarmup = true;
  static std::string rpcWarmupStatus("RPC server started");
  static CCriticalSection cs_rpcWarmup;
  /* Timer-creating functions */
  static RPCTimerInterface* timerInterface = nullptr;
  /* Map of name to timer. */
  static std::map<std::string, std::unique_ptr<RPCTimerBase> > deadlineTimers;
  
  static struct CRPCSignals
  {
      boost::signals2::signal<void ()> Started;
      boost::signals2::signal<void ()> Stopped;
      boost::signals2::signal<void (const CRPCCommand&)> PreCommand;
  } g_rpcSignals;
  
  void RPCServer::OnStarted(std::function<void ()> slot)
  {
      g_rpcSignals.Started.connect(slot);
  }
  
  void RPCServer::OnStopped(std::function<void ()> slot)
  {
      g_rpcSignals.Stopped.connect(slot);
  }
  
  void RPCServer::OnPreCommand(std::function<void (const CRPCCommand&)> slot)
  {
      g_rpcSignals.PreCommand.connect(boost::bind(slot, _1));
  }
  
  void RPCTypeCheck(const UniValue& params,
                    const std::list<UniValue::VType>& typesExpected,
                    bool fAllowNull)
  {
      unsigned int i = 0;
      for (UniValue::VType t : typesExpected)
      {
          if (params.size() <= i)
              break;
  
          const UniValue& v = params[i];
          if (!(fAllowNull && v.isNull())) {
              RPCTypeCheckArgument(v, t);
          }
          i++;
      }
  }
  
  void RPCTypeCheckArgument(const UniValue& value, UniValue::VType typeExpected)
  {
      if (value.type() != typeExpected) {
          throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Expected type %s, got %s", uvTypeName(typeExpected), uvTypeName(value.type())));
      }
  }
  
  void RPCTypeCheckObj(const UniValue& o,
      const std::map<std::string, UniValueType>& typesExpected,
      bool fAllowNull,
      bool fStrict)
  {
      for (const auto& t : typesExpected) {
          const UniValue& v = find_value(o, t.first);
          if (!fAllowNull && v.isNull())
              throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Missing %s", t.first));
  
          if (!(t.second.typeAny || v.type() == t.second.type || (fAllowNull && v.isNull()))) {
              std::string err = strprintf("Expected type %s for %s, got %s",
                  uvTypeName(t.second.type), t.first, uvTypeName(v.type()));
              throw JSONRPCError(RPC_TYPE_ERROR, err);
          }
      }
  
      if (fStrict)
      {
          for (const std::string& k : o.getKeys())
          {
              if (typesExpected.count(k) == 0)
              {
                  std::string err = strprintf("Unexpected key %s", k);
                  throw JSONRPCError(RPC_TYPE_ERROR, err);
              }
          }
      }
  }
  
  CAmount AmountFromValue(const UniValue& value)
  {
      if (!value.isNum() && !value.isStr())
          throw JSONRPCError(RPC_TYPE_ERROR, "Amount is not a number or string");
      CAmount amount;
      if (!ParseFixedPoint(value.getValStr(), 8, &amount))
          throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount");
      if (!MoneyRange(amount))
          throw JSONRPCError(RPC_TYPE_ERROR, "Amount out of range");
      return amount;
  }
  
  uint256 ParseHashV(const UniValue& v, std::string strName)
  {
      std::string strHex;
      if (v.isStr())
          strHex = v.get_str();
      if (!IsHex(strHex)) // Note: IsHex("") is false
          throw JSONRPCError(RPC_INVALID_PARAMETER, strName+" must be hexadecimal string (not '"+strHex+"')");
      if (64 != strHex.length())
          throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("%s must be of length %d (not %d)", strName, 64, strHex.length()));
      uint256 result;
      result.SetHex(strHex);
      return result;
  }
  uint256 ParseHashO(const UniValue& o, std::string strKey)
  {
      return ParseHashV(find_value(o, strKey), strKey);
  }
  std::vector<unsigned char> ParseHexV(const UniValue& v, std::string strName)
  {
      std::string strHex;
      if (v.isStr())
          strHex = v.get_str();
      if (!IsHex(strHex))
          throw JSONRPCError(RPC_INVALID_PARAMETER, strName+" must be hexadecimal string (not '"+strHex+"')");
      return ParseHex(strHex);
  }
  std::vector<unsigned char> ParseHexO(const UniValue& o, std::string strKey)
  {
      return ParseHexV(find_value(o, strKey), strKey);
  }
  
  /**
   * Note: This interface may still be subject to change.
   */
  
  std::string CRPCTable::help(const std::string& strCommand, const JSONRPCRequest& helpreq) const
  {
      std::string strRet;
      std::string category;
      std::set<rpcfn_type> setDone;
      std::vector<std::pair<std::string, const CRPCCommand*> > vCommands;
  
      for (std::map<std::string, const CRPCCommand*>::const_iterator mi = mapCommands.begin(); mi != mapCommands.end(); ++mi)
          vCommands.push_back(make_pair(mi->second->category + mi->first, mi->second));
      sort(vCommands.begin(), vCommands.end());
  
      JSONRPCRequest jreq(helpreq);
      jreq.fHelp = true;
      jreq.params = UniValue();
  
      for (const std::pair<std::string, const CRPCCommand*>& command : vCommands)
      {
          const CRPCCommand *pcmd = command.second;
          std::string strMethod = pcmd->name;
          if ((strCommand != "" || pcmd->category == "hidden") && strMethod != strCommand)
              continue;
          jreq.strMethod = strMethod;
          try
          {
              rpcfn_type pfn = pcmd->actor;
              if (setDone.insert(pfn).second)
                  (*pfn)(jreq);
          }
          catch (const std::exception& e)
          {
              // Help text is returned in an exception
              std::string strHelp = std::string(e.what());
              if (strCommand == "")
              {
                  if (strHelp.find('\n') != std::string::npos)
                      strHelp = strHelp.substr(0, strHelp.find('\n'));
  
                  if (category != pcmd->category)
                  {
                      if (!category.empty())
                          strRet += "\n";
                      category = pcmd->category;
                      std::string firstLetter = category.substr(0,1);
                      boost::to_upper(firstLetter);
                      strRet += "== " + firstLetter + category.substr(1) + " ==\n";
                  }
              }
              strRet += strHelp + "\n";
          }
      }
      if (strRet == "")
          strRet = strprintf("help: unknown command: %s\n", strCommand);
      strRet = strRet.substr(0,strRet.size()-1);
      return strRet;
  }
  
  UniValue help(const JSONRPCRequest& jsonRequest)
  {
      if (jsonRequest.fHelp || jsonRequest.params.size() > 1)
          throw std::runtime_error(
              "help ( \"command\" )\n"
              "\nList all commands, or get help for a specified command.\n"
              "\nArguments:\n"
              "1. \"command\"     (string, optional) The command to get help on\n"
              "\nResult:\n"
              "\"text\"     (string) The help text\n"
          );
  
      std::string strCommand;
      if (jsonRequest.params.size() > 0)
          strCommand = jsonRequest.params[0].get_str();
  
      return tableRPC.help(strCommand, jsonRequest);
  }
  
  
  UniValue stop(const JSONRPCRequest& jsonRequest)
  {
      // Accept the deprecated and ignored 'detach' boolean argument
      if (jsonRequest.fHelp || jsonRequest.params.size() > 1)
          throw std::runtime_error(
              "stop\n"
              "\nStop Gamecoin server.");
      // Event loop will exit after current HTTP requests have been handled, so
      // this reply will get back to the client.
      StartShutdown();
      return "Gamecoin server stopping";
  }
  
  UniValue uptime(const JSONRPCRequest& jsonRequest)
  {
      if (jsonRequest.fHelp || jsonRequest.params.size() > 1)
          throw std::runtime_error(
                  "uptime\n"
                          "\nReturns the total uptime of the server.\n"
                          "\nResult:\n"
                          "ttt        (numeric) The number of seconds that the server has been running\n"
                          "\nExamples:\n"
                  + HelpExampleCli("uptime", "")
                  + HelpExampleRpc("uptime", "")
          );
  
      return GetTime() - GetStartupTime();
  }
  
  /**
   * Call Table
   */
  static const CRPCCommand vRPCCommands[] =
  { //  category              name                      actor (function)         okSafe argNames
    //  --------------------- ------------------------  -----------------------  ------ ----------
      /* Overall control/query calls */
      { "control",            "help",                   &help,                   true,  {"command"}  },
      { "control",            "stop",                   &stop,                   true,  {}  },
      { "control",            "uptime",                 &uptime,                 true,  {}  },
  };
  
  CRPCTable::CRPCTable()
  {
      unsigned int vcidx;
      for (vcidx = 0; vcidx < (sizeof(vRPCCommands) / sizeof(vRPCCommands[0])); vcidx++)
      {
          const CRPCCommand *pcmd;
  
          pcmd = &vRPCCommands[vcidx];
          mapCommands[pcmd->name] = pcmd;
      }
  }
  
  const CRPCCommand *CRPCTable::operator[](const std::string &name) const
  {
      std::map<std::string, const CRPCCommand*>::const_iterator it = mapCommands.find(name);
      if (it == mapCommands.end())
          return nullptr;
      return (*it).second;
  }
  
  bool CRPCTable::appendCommand(const std::string& name, const CRPCCommand* pcmd)
  {
      if (IsRPCRunning())
          return false;
  
      // don't allow overwriting for now
      std::map<std::string, const CRPCCommand*>::const_iterator it = mapCommands.find(name);
      if (it != mapCommands.end())
          return false;
  
      mapCommands[name] = pcmd;
      return true;
  }
  
  bool StartRPC()
  {
      LogPrint(BCLog::RPC, "Starting RPC\n");
      fRPCRunning = true;
      g_rpcSignals.Started();
      return true;
  }
  
  void InterruptRPC()
  {
      LogPrint(BCLog::RPC, "Interrupting RPC\n");
      // Interrupt e.g. running longpolls
      fRPCRunning = false;
  }
  
  void StopRPC()
  {
      LogPrint(BCLog::RPC, "Stopping RPC\n");
      deadlineTimers.clear();
      DeleteAuthCookie();
      g_rpcSignals.Stopped();
  }
  
  bool IsRPCRunning()
  {
      return fRPCRunning;
  }
  
  void SetRPCWarmupStatus(const std::string& newStatus)
  {
      LOCK(cs_rpcWarmup);
      rpcWarmupStatus = newStatus;
  }
  
  void SetRPCWarmupFinished()
  {
      LOCK(cs_rpcWarmup);
      assert(fRPCInWarmup);
      fRPCInWarmup = false;
  }
  
  bool RPCIsInWarmup(std::string *outStatus)
  {
      LOCK(cs_rpcWarmup);
      if (outStatus)
          *outStatus = rpcWarmupStatus;
      return fRPCInWarmup;
  }
  
  void JSONRPCRequest::parse(const UniValue& valRequest)
  {
      // Parse request
      if (!valRequest.isObject())
          throw JSONRPCError(RPC_INVALID_REQUEST, "Invalid Request object");
      const UniValue& request = valRequest.get_obj();
  
      // Parse id now so errors from here on will have the id
      id = find_value(request, "id");
  
      // Parse method
      UniValue valMethod = find_value(request, "method");
      if (valMethod.isNull())
          throw JSONRPCError(RPC_INVALID_REQUEST, "Missing method");
      if (!valMethod.isStr())
          throw JSONRPCError(RPC_INVALID_REQUEST, "Method must be a string");
      strMethod = valMethod.get_str();
      LogPrint(BCLog::RPC, "ThreadRPCServer method=%s\n", SanitizeString(strMethod));
  
      // Parse params
      UniValue valParams = find_value(request, "params");
      if (valParams.isArray() || valParams.isObject())
          params = valParams;
      else if (valParams.isNull())
          params = UniValue(UniValue::VARR);
      else
          throw JSONRPCError(RPC_INVALID_REQUEST, "Params must be an array or object");
  }
  
  static UniValue JSONRPCExecOne(const UniValue& req)
  {
      UniValue rpc_result(UniValue::VOBJ);
  
      JSONRPCRequest jreq;
      try {
          jreq.parse(req);
  
          UniValue result = tableRPC.execute(jreq);
          rpc_result = JSONRPCReplyObj(result, NullUniValue, jreq.id);
      }
      catch (const UniValue& objError)
      {
          rpc_result = JSONRPCReplyObj(NullUniValue, objError, jreq.id);
      }
      catch (const std::exception& e)
      {
          rpc_result = JSONRPCReplyObj(NullUniValue,
                                       JSONRPCError(RPC_PARSE_ERROR, e.what()), jreq.id);
      }
  
      return rpc_result;
  }
  
  std::string JSONRPCExecBatch(const UniValue& vReq)
  {
      UniValue ret(UniValue::VARR);
      for (unsigned int reqIdx = 0; reqIdx < vReq.size(); reqIdx++)
          ret.push_back(JSONRPCExecOne(vReq[reqIdx]));
  
      return ret.write() + "\n";
  }
  
  /**
   * Process named arguments into a vector of positional arguments, based on the
   * passed-in specification for the RPC call's arguments.
   */
  static inline JSONRPCRequest transformNamedArguments(const JSONRPCRequest& in, const std::vector<std::string>& argNames)
  {
      JSONRPCRequest out = in;
      out.params = UniValue(UniValue::VARR);
      // Build a map of parameters, and remove ones that have been processed, so that we can throw a focused error if
      // there is an unknown one.
      const std::vector<std::string>& keys = in.params.getKeys();
      const std::vector<UniValue>& values = in.params.getValues();
      std::unordered_map<std::string, const UniValue*> argsIn;
      for (size_t i=0; i<keys.size(); ++i) {
          argsIn[keys[i]] = &values[i];
      }
      // Process expected parameters.
      int hole = 0;
      for (const std::string &argNamePattern: argNames) {
          std::vector<std::string> vargNames;
          boost::algorithm::split(vargNames, argNamePattern, boost::algorithm::is_any_of("|"));
          auto fr = argsIn.end();
          for (const std::string & argName : vargNames) {
              fr = argsIn.find(argName);
              if (fr != argsIn.end()) {
                  break;
              }
          }
          if (fr != argsIn.end()) {
              for (int i = 0; i < hole; ++i) {
                  // Fill hole between specified parameters with JSON nulls,
                  // but not at the end (for backwards compatibility with calls
                  // that act based on number of specified parameters).
                  out.params.push_back(UniValue());
              }
              hole = 0;
              out.params.push_back(*fr->second);
              argsIn.erase(fr);
          } else {
              hole += 1;
          }
      }
      // If there are still arguments in the argsIn map, this is an error.
      if (!argsIn.empty()) {
          throw JSONRPCError(RPC_INVALID_PARAMETER, "Unknown named parameter " + argsIn.begin()->first);
      }
      // Return request with named arguments transformed to positional arguments
      return out;
  }
  
  UniValue CRPCTable::execute(const JSONRPCRequest &request) const
  {
      // Return immediately if in warmup
      {
          LOCK(cs_rpcWarmup);
          if (fRPCInWarmup)
              throw JSONRPCError(RPC_IN_WARMUP, rpcWarmupStatus);
      }
  
      // Find method
      const CRPCCommand *pcmd = tableRPC[request.strMethod];
      if (!pcmd)
          throw JSONRPCError(RPC_METHOD_NOT_FOUND, "Method not found");
  
      g_rpcSignals.PreCommand(*pcmd);
  
      try
      {
          // Execute, convert arguments to array if necessary
          if (request.params.isObject()) {
              return pcmd->actor(transformNamedArguments(request, pcmd->argNames));
          } else {
              return pcmd->actor(request);
          }
      }
      catch (const std::exception& e)
      {
          throw JSONRPCError(RPC_MISC_ERROR, e.what());
      }
  }
  
  std::vector<std::string> CRPCTable::listCommands() const
  {
      std::vector<std::string> commandList;
      typedef std::map<std::string, const CRPCCommand*> commandMap;
  
      std::transform( mapCommands.begin(), mapCommands.end(),
                     std::back_inserter(commandList),
                     boost::bind(&commandMap::value_type::first,_1) );
      return commandList;
  }
  
  std::string HelpExampleCli(const std::string& methodname, const std::string& args)
  {
      return "> gamecoin-cli " + methodname + " " + args + "\n";
  }
  
  std::string HelpExampleRpc(const std::string& methodname, const std::string& args)
  {
      return "> curl --user myusername --data-binary '{\"jsonrpc\": \"1.0\", \"id\":\"curltest\", "
          "\"method\": \"" + methodname + "\", \"params\": [" + args + "] }' -H 'content-type: text/plain;' http://127.0.0.1:9332/\n";
  }
  
  void RPCSetTimerInterfaceIfUnset(RPCTimerInterface *iface)
  {
      if (!timerInterface)
          timerInterface = iface;
  }
  
  void RPCSetTimerInterface(RPCTimerInterface *iface)
  {
      timerInterface = iface;
  }
  
  void RPCUnsetTimerInterface(RPCTimerInterface *iface)
  {
      if (timerInterface == iface)
          timerInterface = nullptr;
  }
  
  void RPCRunLater(const std::string& name, std::function<void(void)> func, int64_t nSeconds)
  {
      if (!timerInterface)
          throw JSONRPCError(RPC_INTERNAL_ERROR, "No timer handler registered for RPC");
      deadlineTimers.erase(name);
      LogPrint(BCLog::RPC, "queue run of timer %s in %i seconds (using %s)\n", name, nSeconds, timerInterface->Name());
      deadlineTimers.emplace(name, std::unique_ptr<RPCTimerBase>(timerInterface->NewTimer(func, nSeconds*1000)));
  }
  
  int RPCSerializationFlags()
  {
      int flag = 0;
      if (gArgs.GetArg("-rpcserialversion", DEFAULT_RPC_SERIALIZE_VERSION) == 0)
          flag |= SERIALIZE_TRANSACTION_NO_WITNESS;
      return flag;
  }
  
  CRPCTable tableRPC;
  