/
RequestFilter.kt
66 lines (55 loc) · 2.15 KB
/
RequestFilter.kt
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/*
* Copyright (C) 2017/2021 e-voyageurs technologies
*
* 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 ai.tock.shared.security
import io.vertx.core.http.HttpServerRequest
fun createRequestFilter(allowedIps: Set<String>?, xAuthToken: String?): RequestFilter = RequestFiltersComposer(
listOfNotNull(
allowedIps
?.mapNotNull { ip -> ip.trim().takeUnless { it.isEmpty() } }
?.toSet()
?.takeUnless { it.isEmpty() }
?.let { IPRequestFilter(it) },
xAuthToken
?.takeUnless { it.isBlank() }
?.let { XAuthTokenRequestFilter(it.trim()) }
)
)
/**
* A request filter is used to filter an incoming request.
*/
interface RequestFilter {
/**
* Returns true is the request is accepted, false either.
*/
fun accept(request: HttpServerRequest): Boolean
}
internal class RequestFiltersComposer(private val filters: List<RequestFilter>) : RequestFilter {
override fun accept(request: HttpServerRequest): Boolean {
return filters.all { it.accept(request) }
}
}
internal class IPRequestFilter(private val allowedIps: Set<String>) : RequestFilter {
override fun accept(request: HttpServerRequest): Boolean {
val directIp = request.remoteAddress().host()
val forwardedIp = request.getHeader("X-Forwarded-For")?.split(",")?.lastOrNull()?.trim()
return allowedIps.contains(directIp) || allowedIps.contains(forwardedIp)
}
}
internal class XAuthTokenRequestFilter(private val token: String) : RequestFilter {
override fun accept(request: HttpServerRequest): Boolean {
return token == request.getHeader("X-Auth-Token")
}
}