Permission System

[xImAnton]

Related to #9

Semoxy Permission System

Usage

The permission system is added to let the admin user restrict the abilities that other users have. This could be useful when you only want to let people start the server when it crashed or other things.

Structure

There are dot-notated permission nodes that indicate whether a user can dispatch a specific action or not.
Permissions are primary set on permission groups that are assigned to each user. Secondary these group permissions can be overridden for each user. By default a user has no permissions, but they should be assigned automatically on creation to a default-group that can be modified by an admin.

Nodes

A single permission node consists of lowercase words, dots, tildes and asterisks.

global.server.create - The user can create a server

Asterisks represent a wildcard for anything in its position.

global.server.* - The user has all nodes that start with global.server

Tildes at the start of the note indicate that the node is negated. This is useful when using wildcards because these negated nodes are evaluated after them.

~global.server.create - the user can't create new servers

Order of evaluation

Do the following for all groups the user has and after that for the user specific permissions:

1. Add Wildcards
2. Add normal nodes
3. remove negated nodes

Save format

All permission related stuff on the user will be stored in a permissions object that has the following structure:

{
  "groups": [
    "List",
    "of",
    "group",
    "ids"
  ],
  "overrides": [
    "user",
    "specific",
    "nodes"
  ],
  "effectives": [
    "permission",
    "cache"
  ],
  "effectivesOutdated": false
}

Since it could be costly to recalculate the permissions for a user on every request, the effectives-key is added. It caches all actual permissions that the user has, with all groups and overrides included. When the permission for a user or a group that effects the users permissions is changed, effectivesOutdated should be set to true to regenerate them on the next request the user issues.

Permission Nodes

Node	Description
global.server.create	the user can create new servers
global.server.delete	the user can remove servers
global.user.create	the user can add new users
global.user.modify	the user can grant permissions that he has to other users
global.user.delete	the user can remove users
server.name.start	the user can start this server
server.name.stop	the user can stop this server
server.name.command.commandname	the user can execute a specific command
server.name.display	the user can see this server
server.name.player.kick	the user can kick players
server.name.player.ban	the user can ban a player
server.name.player.whitelist	the user can add players to the whitelist
server.name.player.op	the user can op players
server.name.player.deop	the user can deop players
server.name.dsm	the user can manage dsm settings
server.name.worlds	the user can manage worlds on this server
server.name.backups	the user can manage backups for this server
server.name.addons	the user can manage addon
global.system	the user can manage semoxy settings