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/*
* Copyright 2016 Coursera Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.coursera.naptime.access.combiner
import org.coursera.common.concurrent.Futures
import org.coursera.naptime.NaptimeActionException
import org.coursera.naptime.access.HeaderAccessControl
import org.coursera.naptime.access.StructuredAccessControl
import play.api.mvc.RequestHeader
import scala.concurrent.ExecutionContext
import scala.concurrent.Future
/**
* Allows the request if at least one of access controls allow it.
*
* The authentication data are exposed as a tuple containing [[Option]]s where at least one
* is defined.
*/
private[access] trait AnyOf {
/** See [[AnyOf]]. */
def anyOf[A, B](
controlA: HeaderAccessControl[A],
controlB: HeaderAccessControl[B]):
HeaderAccessControl[(Option[A], Option[B])] = {
new HeaderAccessControl[(Option[A], Option[B])] {
override def run(requestHeader: RequestHeader)(implicit ec: ExecutionContext):
Future[Either[NaptimeActionException, (Option[A], Option[B])]] = {
val futureA = Futures.safelyCall(controlA.run(requestHeader))
val futureB = Futures.safelyCall(controlB.run(requestHeader))
for {
resultA <- futureA
resultB <- futureB
} yield {
(resultA, resultB) match {
case (Left(errorA), Left(_)) => Left(errorA) // Ignore the other error.
case _ =>
Right((resultA.right.toOption, resultB.right.toOption))
}
}
}
override private[naptime] def check(
authInfo: (Option[A], Option[B])): Either[NaptimeActionException, (Option[A], Option[B])] = {
val resultA = computeCheckResult(authInfo._1, controlA)
val resultB = computeCheckResult(authInfo._2, controlB)
(resultA, resultB) match {
case (Left(errorA), Left(_)) => Left(errorA)
case _ =>
Right((resultA.right.toOption, resultB.right.toOption))
}
}
}
}
/** See [[AnyOf]]. */
def anyOf[A, B, C](
controlA: HeaderAccessControl[A],
controlB: HeaderAccessControl[B],
controlC: HeaderAccessControl[C]):
HeaderAccessControl[(Option[A], Option[B], Option[C])] = {
new HeaderAccessControl[(Option[A], Option[B], Option[C])] {
override def run(requestHeader: RequestHeader)(implicit ec: ExecutionContext):
Future[Either[NaptimeActionException, (Option[A], Option[B], Option[C])]] = {
val futureA = Futures.safelyCall(controlA.run(requestHeader))
val futureB = Futures.safelyCall(controlB.run(requestHeader))
val futureC = Futures.safelyCall(controlC.run(requestHeader))
for {
resultA <- futureA
resultB <- futureB
resultC <- futureC
} yield {
(resultA, resultB, resultC) match {
case (Left(errorA), Left(_), Left(_)) => Left(errorA) // Ignore the other errors.
case _ =>
Right((resultA.right.toOption, resultB.right.toOption, resultC.right.toOption))
}
}
}
override private[naptime] def check(
authInfo: (Option[A], Option[B], Option[C])):
Either[NaptimeActionException, (Option[A], Option[B], Option[C])] = {
val resultA = computeCheckResult(authInfo._1, controlA)
val resultB = computeCheckResult(authInfo._2, controlB)
val resultC = computeCheckResult(authInfo._3, controlC)
(resultA, resultB, resultC) match {
case (Left(errorA), Left(_), Left(_)) => Left(errorA)
case _ =>
Right((resultA.right.toOption, resultB.right.toOption, resultC.right.toOption))
}
}
}
}
/**
* Helper for the `check` functions to run the check functionality of a HeaderAccessControl.
*/
private[this] def computeCheckResult[T](
elem: Option[T],
accessControl: HeaderAccessControl[T]): Either[NaptimeActionException, T] = {
elem.map(e => accessControl.check(e)).getOrElse(StructuredAccessControl.missingResponse)
}
}
