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package org.onap.vid.properties
import org.apache.commons.io.filefilter.WildcardFileFilter
import org.springframework.web.context.request.RequestContextHolder.getRequestAttributes
import org.springframework.web.context.request.ServletRequestAttributes
import org.togglz.core.Feature
import org.togglz.core.manager.FeatureManager
import org.togglz.core.manager.FeatureManagerBuilder
import org.togglz.core.repository.file.FileBasedStateRepository
import java.io.File
import java.io.FilenameFilter
import javax.servlet.ServletContext
import javax.servlet.http.HttpServletRequest
private const val SLOW_RELOAD = 60_000
private const val COOKIE_NAME = "features.set"
class FeatureSetsManager(
private val defaultManager: FeatureManager,
private val nameProvider: AlternativeFeatureSetNameProvider,
private val servletContext: ServletContext
) : FeatureManager by defaultManager {
override fun isActive(feature: Feature?): Boolean {
return resolvedFeatureManager().isActive(feature)
}
private fun resolvedFeatureManager(): FeatureManager {
return when (val alternativeFeatureSetName = nameProvider.alternativeFeatureSetName) {
null -> defaultManager
else -> allFeatureManagers.getValue(alternativeFeatureSetName)
}
}
internal val allFeatureManagers: Map<String, FeatureManager> by lazy {
allFeatureSetFiles().associateBy(
{ it.name },
{ newFeatureManager(it) }
).withDefault { allFeaturesOff }
}
private val allFeaturesOff =
FeatureManagerBuilder().featureEnum(Features::class.java).build()
private fun newFeatureManager(file: File): FeatureManager {
return FeatureManagerBuilder()
.featureEnum(Features::class.java)
.stateRepository(FileBasedStateRepository(file, SLOW_RELOAD))
.build()
}
private fun allFeatureSetFiles(): Array<File> {
val dir = File(servletContext.getRealPath("/WEB-INF/conf/"))
val fileFilter: FilenameFilter = WildcardFileFilter("*.features.properties")
return dir.listFiles(fileFilter) ?: emptyArray()
}
}
interface AlternativeFeatureSetNameProvider {
val alternativeFeatureSetName: String?
}
class AlternativeFeatureSetNameFromCookie: AlternativeFeatureSetNameProvider {
override val alternativeFeatureSetName: String?
get() = valueFromCookie(currentHttpRequest())
internal fun valueFromCookie(httpServletRequest: HttpServletRequest?): String? {
return httpServletRequest
?.cookies
?.firstOrNull { it.name == COOKIE_NAME }
?.value
}
internal fun currentHttpRequest(): HttpServletRequest? {
return when (val requestAttributes = getRequestAttributes()) {
is ServletRequestAttributes -> requestAttributes.request
else -> null
}
}
}
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