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PolicyMode.scala
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PolicyMode.scala
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/*
*************************************************************************************
* Copyright 2016 Normation SAS
*************************************************************************************
*
* This file is part of Rudder.
*
* Rudder is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* In accordance with the terms of section 7 (7. Additional Terms.) of
* the GNU General Public License version 3, the copyright holders add
* the following Additional permissions:
* Notwithstanding to the terms of section 5 (5. Conveying Modified Source
* Versions) and 6 (6. Conveying Non-Source Forms.) of the GNU General
* Public License version 3, when you create a Related Module, this
* Related Module is not considered as a part of the work and may be
* distributed under the license agreement of your choice.
* A "Related Module" means a set of sources files including their
* documentation that, without modification of the Source Code, enables
* supplementary functions or services in addition to those offered by
* the Software.
*
* Rudder is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Rudder. If not, see <http://www.gnu.org/licenses/>.
*
*************************************************************************************
*/
package com.normation.rudder.domain.policies
import net.liftweb.common.{Box,Full,Failure}
import ca.mrvisser.sealerate.values
sealed trait PolicyMode { def name : String }
final object PolicyMode {
final case object Verify extends PolicyMode { val name = "verify" }
final case object Enforce extends PolicyMode { val name = "enforce" }
def allModes: Set[PolicyMode] = values[PolicyMode]
//get from string, case insensitive
def parse (value : String) : Box[PolicyMode] = {
allModes.find { _.name == value.toLowerCase() } match {
case None =>
Failure(s"Unable to parse policy mode name '${value}'. was expecting ${allModes.map(_.name).mkString("'", "' or '", "'")}.")
case Some(mode) =>
Full(mode)
}
}
/*
* Combine different modes and get the resulting one. Typically used when we
* want to know what is the policy mode on a given node, for a given directive,
* and we know from the context the default global value and the value of
* other directives for the same technique also on that node.
*/
def computeMode(globalValue : GlobalPolicyMode, nodeMode : Option[PolicyMode], directiveMode : Seq[Option[PolicyMode]]) = {
globalValue.overridable match {
case PolicyModeOverrides.Always =>
nodeMode match {
case Some(Verify) => Verify
case _ =>
(((None : Option[PolicyMode]) /: directiveMode) {
case (None,current) => current
case (Some(Verify),_) | (_,Some(Verify)) => Some(Verify)
case _ => Some(Enforce)
}).getOrElse(globalValue.mode)
}
case PolicyModeOverrides.Unoverridable =>
globalValue.mode
}
}
}
/*
* What is allowed to override the global value for policy mode
*/
sealed trait PolicyModeOverrides
final object PolicyModeOverrides {
//nothing can override. Global is the sole value
final case object Unoverridable extends PolicyModeOverrides
//anything can override. Combination rules applies.
final case object Always extends PolicyModeOverrides
//directives, groups, ...
}
final case class GlobalPolicyMode (
mode : PolicyMode
, overridable: PolicyModeOverrides
)