new_contents: from twisted.plugin import IPlugin
  from twisted.words.protocols import irc
  from txircd.module_interface import ICommand, IModuleData, Command, ModuleData
  from txircd.utils import isValidNick
  from zope.interface import implements
  
  class SanickCommand(ModuleData, Command):
      implements(IPlugin, IModuleData, ICommand)
  
      name = "SanickCommand"
  
      def hookIRCd(self, ircd):
          self.ircd = ircd
  
      def userCommands(self):
          return [ ("SANICK", 1, self) ]
  
      def actions(self):
          return [ ("commandpermission-SANICK", 1, self.restrictToOpers) ]
  
      def restrictToOpers(self, user, command, data):
          if not self.ircd.runActionUntilValue("userhasoperpermission", user, "command-sanick", users=[user]):
              user.sendMessage(irc.ERR_NOPRIVILEGES, ":Permission denied - You do not have the correct operator privileges")
              return False
          return None
  
      def parseParams(self, user, params, prefix, tags):
          if len(params) < 2:
              user.sendSingleError("SanickCmd", irc.ERR_NEEDMOREPARAMS, "SANICK", ":Not enough parameters")
              return None
          if params[0] not in self.ircd.userNicks:
              user.sendSingleError("SanickCmd", irc.ERR_NOSUCHSERVER, ":No such nick/channel")
              return None
          if not isValidNick(params[1]):
              user.sendSingleError("SanickCmd", irc.ERR_ERRONEUSNICKNAME, params[1], ":Erroneous nickname")
              return None
          if params[1] in self.ircd.userNicks:
              otherUserID = self.ircd.userNicks[params[1]]
              if user.uuid != otherUserID:
                  user.sendSingleError("SanickCmd", irc.ERR_NICKNAMEINUSE, params[1], ":Nickname is already in use")
                  return None
          return {
              "target": self.ircd.users[self.ircd.userNicks[params[0]]],
              "nick": params[1]
          }
  
      def execute(self, user, data):
          data["target"].changeNick(data["nick"])
          return True
  
  sanick = SanickCommand()
subject: Implement the SANICK command