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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.http.filter
import com.yahoo.container.core.ChainsConfig
import com.yahoo.component.provider.ComponentRegistry
import com.yahoo.jdisc.http.filter.chain.{RequestFilterChain, ResponseFilterChain}
import com.yahoo.jdisc.http.filter.{RequestFilter, ResponseFilter}
import com.yahoo.jdisc.http.filter.{SecurityResponseFilterChain, SecurityRequestFilterChain, SecurityResponseFilter, SecurityRequestFilter}
import com.yahoo.component.{ComponentSpecification, ComponentId, AbstractComponent}
import com.yahoo.component.chain.model.ChainsModelBuilder
import com.yahoo.component.chain.{Chain, ChainedComponent, ChainsConfigurer}
import com.yahoo.processing.execution.chain.ChainRegistry
import FilterChainRepository._
import scala.collection.JavaConversions._
/**
* Creates JDisc request/response filter chains.
* @author tonytv
*/
class FilterChainRepository(chainsConfig: ChainsConfig,
requestFilters: ComponentRegistry[RequestFilter],
responseFilters: ComponentRegistry[ResponseFilter],
securityRequestFilters: ComponentRegistry[SecurityRequestFilter],
securityResponseFilters: ComponentRegistry[SecurityResponseFilter]) extends AbstractComponent {
private val filtersAndChains = new ComponentRegistry[AnyRef]
addAllFilters(filtersAndChains, requestFilters, responseFilters, securityRequestFilters, securityResponseFilters)
addAllChains(filtersAndChains, chainsConfig, requestFilters, responseFilters, securityRequestFilters, securityResponseFilters)
filtersAndChains.freeze()
def getFilter(componentSpecification: ComponentSpecification) =
filtersAndChains.getComponent(componentSpecification)
}
private[filter] object FilterChainRepository {
case class FilterWrapper(id: ComponentId, filter: AnyRef) extends ChainedComponent(id) {
def filterType: Class[_] = filter match {
case f: RequestFilter => classOf[RequestFilter]
case f: ResponseFilter => classOf[ResponseFilter]
case f: SecurityRequestFilter => classOf[SecurityRequestFilter]
case f: SecurityResponseFilter => classOf[SecurityResponseFilter]
case _ => throw new IllegalArgumentException("Unsupported filter type: " + filter.getClass.getName)
}
}
def allFiltersWrapped(registries: ComponentRegistry[_ <: AnyRef]*): ComponentRegistry[FilterWrapper] = {
val wrappedFilters = new ComponentRegistry[FilterWrapper]
def registerWrappedFilters(registry: ComponentRegistry[_ <: AnyRef]) {
for ((id, filter) <- registry.allComponentsById())
wrappedFilters.register(id, new FilterWrapper(id, filter))
}
registries.foreach(registerWrappedFilters)
wrappedFilters.freeze()
wrappedFilters
}
private def addAllFilters(destination: ComponentRegistry[AnyRef], registries: ComponentRegistry[_ <: AnyRef]*) {
def wrapSecurityFilter(filter: AnyRef) = {
if (isSecurityFilter(filter)) createSecurityChain(List(filter))
else filter
}
for {
registry <- registries
(id, filter) <- registry.allComponentsById()
} destination.register(id, wrapSecurityFilter(filter))
}
private def addAllChains(destination: ComponentRegistry[AnyRef], chainsConfig: ChainsConfig, filters: ComponentRegistry[_ <: AnyRef]*) {
val chainRegistry = buildChainsRegistry(chainsConfig, filters)
for (chain <- chainRegistry.allComponents()) {
destination.register(chain.getId, toJDiscChain(chain))
}
}
def buildChainsRegistry(chainsConfig: ChainsConfig, filters: Seq[ComponentRegistry[_ <: AnyRef]]) = {
val chainRegistry = new ChainRegistry[FilterWrapper]
val chainsModel = ChainsModelBuilder.buildFromConfig(chainsConfig)
ChainsConfigurer.prepareChainRegistry(chainRegistry, chainsModel, allFiltersWrapped(filters: _*))
chainRegistry.freeze()
chainRegistry
}
private def toJDiscChain(chain: Chain[FilterWrapper]): AnyRef = {
checkFilterTypesCompatible(chain)
val jDiscFilters = chain.components() map {_.filter}
wrapJDiscChain(wrapSecurityFilters(jDiscFilters.toList))
}
def wrapJDiscChain(filters: List[AnyRef]): AnyRef = {
if (filters.size == 1) filters.head
else {
filters.head match {
case _: RequestFilter => RequestFilterChain.newInstance(filters.asInstanceOf[List[RequestFilter]])
case _: ResponseFilter => ResponseFilterChain.newInstance(filters.asInstanceOf[List[ResponseFilter]])
}
}
}
def wrapSecurityFilters(filters: List[AnyRef]): List[AnyRef] = {
if (filters.isEmpty) List()
else {
val (securityFilters, rest) = filters.span(isSecurityFilter)
if (securityFilters.isEmpty) {
val (regularFilters, rest) = filters.span(!isSecurityFilter(_))
regularFilters ++ wrapSecurityFilters(rest)
} else {
createSecurityChain(securityFilters) :: wrapSecurityFilters(rest)
}
}
}
def createSecurityChain(filters: List[AnyRef]): AnyRef = {
filters.head match {
case _: SecurityRequestFilter => SecurityRequestFilterChain.newInstance(filters.asInstanceOf[List[SecurityRequestFilter]])
case _: SecurityResponseFilter => SecurityResponseFilterChain.newInstance(filters.asInstanceOf[List[SecurityResponseFilter]])
case _ => throw new IllegalArgumentException("Unexpected class " + filters.head.getClass)
}
}
def isSecurityFilter(filter: AnyRef) = {
filter match {
case _: SecurityRequestFilter => true
case _: SecurityResponseFilter => true
case _ => false
}
}
def checkFilterTypesCompatible(chain: Chain[FilterWrapper]) {
val requestFilters = Set[Class[_]](classOf[RequestFilter], classOf[SecurityRequestFilter])
val responseFilters = Set[Class[_]](classOf[ResponseFilter], classOf[SecurityResponseFilter])
def check(a: FilterWrapper, b: FilterWrapper) {
if (requestFilters(a.filterType) && responseFilters(b.filterType))
throw new RuntimeException("Can't mix request and response filters in chain %s: %s, %s".format(chain.getId, a.getId, b.getId))
}
overlappingPairIterator(chain.components).foreach {
case Seq(_) =>
case Seq(filter1: FilterWrapper, filter2: FilterWrapper) =>
check(filter1, filter2)
check(filter2, filter1)
}
}
def overlappingPairIterator[T](s: Seq[T]) = s.iterator.sliding(2, 1)
}
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