Sample Permissions plugin code

Hi everyone!
Some time ago I wrote a small plugin 'Permissions' just for me and for the tests.
But soon this plugin would be useless (oxide has its own system)...
So I decided to put a plug here, maybe it will help someone.

• perm.give <steamid\name> <permission>
• perm.take <steamid\name> <permission>
• perm.list <steamid>
• perm.list

Code:

-- Get API func
local API = GetPermissionsAPI() -- it's global function-- Get UserData
local userdata = API.GetUserDataFromPlayer(player) -- if userdata not found it will return nil
local userdata = API.GetUserDataFromPlayer(player, true) -- if userdata not found it will create new and return new userdata
local userdata = API.GetUserData(steamid, do_create_new)-- userdata func
userdata:GivePerm(permission) -- give permission (if given -> return true, if already have -> return nil)
userdata:TakePerm(permission) -- take permission(if taken -> return true, if have not -> return nil)
userdata:HasPerm(permission)  -- check permission(if found -> return Position, else nil)-- Get all permissions
for i=1, #userdata do
       print(userdata[i])
end

Code:

PLUGIN.Name = "Permissions"
PLUGIN.Title = "Permissions"
PLUGIN.Version = V(1, 0, 0)
PLUGIN.Description = "Adds Permissions System."
PLUGIN.Author = "Bombardir"
PLUGIN.HasConfig   = truelocal USERS = {}
-- ********** API ********** --
local API = {}
local base_userdata = {}function GetPermissionsAPI()
    return API
endfunction base_userdata:GivePerm(perm)
    if not self:HasPerm(perm) then
        table.insert(self, perm)
        datafile.SaveDataTable( "Permissions" )
        return true
    end
endfunction base_userdata:TakePerm(perm)
    local pos = self:HasPerm(perm)
    if pos then
        table.remove(self, pos)
        datafile.SaveDataTable( "Permissions" )
        return true
    end
endfunction base_userdata:HasPerm(perm)
    for i=1, #self do
        if self[i] == perm then
            return i
        end
    end
endfunction API.GetUserDataFromPlayer(player, do_create_new)
    return API.GetUserData(rust.UserIDFromPlayer( player ), do_create_new)
endfunction API.GetUserData(steamid, do_create_new)
    local data = USERS[steamid]
    if not data then
        if do_create_new then
            data = {}
            setmetatable(data, {__index = base_userdata})
            USERS[steamid] = data
        else
            return nil
        end
    end
    return data
end-- ********** API ********** --function PLUGIN:Init()
    USERS = datafile.GetDataTable( "Permissions" ) or {}
    for k, v in pairs(USERS) do
        if v[1] then
            setmetatable(USERS[k], {__index = base_userdata})
        else
            USERS[k] = nil
        end
        datafile.SaveDataTable( "Permissions" )
    end
    command.AddConsoleCommand( "perm.give", self.Object, "CC_Perm_Give" )
    command.AddConsoleCommand( "perm.take", self.Object, "CC_Perm_Take" )
    command.AddConsoleCommand( "perm.list", self.Object, "CC_Perm_List" )
    self.Config.ChatName = self.Config.ChatName or "[Permissions]"
    self.Config.No_Permission_Message = self.Config.No_Permission_Message or "You don't have permission for this command!"
    self:SaveConfig()
endlocal function Check_Perm(arg, permission)
    local player
    if arg.connection then
        player = arg.connection.player
    end
    if player then
        local data = API.GetUserData(rust.UserIDFromPlayer( player ))
        if (data and data:HasPerm(permission)) or player:GetComponent("BaseNetworkable").net.connection.authLevel >= 2 then
            return true
        else
            player:SendConsoleCommand( "chat.add \"" .. self.Config.ChatName .. "\""  .. self.Config.No_Permission_Message )
        end
    else
        return true
    end
endfunction PLUGIN:CC_Perm_Give(arg)
    local reply = ""
    if Check_Perm(arg, "Perm_Give") then
        local steam = arg:GetString( 0, false )
        local perm = arg:GetString( 1, false )
        if steam and perm then
            local target   = global.BasePlayer.Find(steam)
            local userdata
            if target then
                userdata = API.GetUserDataFromPlayer( target, true)
                steam = target.displayName
            else
                userdata = API.GetUserData(steam, true)
            end
            if userdata:GivePerm(perm) then
                reply = "Permission " .. perm .. " given to '" .. steam .. "' !"
            else
                reply =  "'" .. steam .. "' already have this permission!"
            end
        else
            reply = "Syntax Error! (perm.give <steam> <permission>)"
        end
    else
        reply = "No permission!"
    end
    arg:ReplyWith(reply)
    return true
endfunction PLUGIN:CC_Perm_Take(arg)
    local reply = ""
    if Check_Perm(arg, "Perm_Take") then
        local steam = arg:GetString( 0, false )
        local perm = arg:GetString( 1, false )
        if steam and perm then
            local target   = global.BasePlayer.Find(steam)
            local userdata
            if target then
                userdata = API.GetUserDataFromPlayer( target )
                steam = target.displayName
            else
                userdata = API.GetUserData(steam)
            end
            if userdata then
                if userdata:TakePerm(perm) then
                    reply = "Permission " .. perm .. " was taken from '" .. steam .. "' !"
                else
                    reply =  "'" .. steam .. "' haven't this permission! (" .. perm .. ")"
                end
            else
                reply =  "'" .. steam .. "' haven't permissions!"
            end
        else
            reply = "Syntax Error! (perm.take <steam> <permission>)"
        end
    else
        reply = "No permission!"
    end
    arg:ReplyWith(reply)
    return true
endfunction PLUGIN:CC_Perm_List(arg)
    local reply = ""
    if Check_Perm(arg, "Perm_List") then
        local steam = arg:GetString( 0, "all" )
        if steam == "all" then
            reply = reply .. "------------- PERMISSIONS LIST -------------\n"
            for steam, data in pairs(USERS) do
                reply = reply .. steam .. ": " .. table.concat(data, ", ") .. "\n"
            end
            reply = reply .. "--------------------------------------------"
        else
            local data = USERS[steam]
            if data then
                reply = reply .. steam .. ": " .. table.concat(data, ", ")
            else
                reply = "No user with steam: '" .. steam .. "' !"
            end
        end
    else
        reply = "No permission!"
    end
    arg:ReplyWith(reply)
    return true
end