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/*
* Nextcloud Android Library is available under MIT license
*
* @author Álvaro Brey Vilas
* Copyright (C) 2022 Álvaro Brey Vilas
* Copyright (C) 2022 Nextcloud GmbH
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.nextcloud.common
import com.owncloud.android.lib.common.utils.Log_OC
import okhttp3.ConnectionPool
import okhttp3.Interceptor
import okhttp3.Request
import okhttp3.Response
import java.net.ConnectException
import java.net.SocketTimeoutException
class IPv4FallbackInterceptor(private val connectionPool: ConnectionPool) : Interceptor {
companion object {
private const val TAG = "IPv4FallbackInterceptor"
private val SERVER_ERROR_RANGE = 500..599
}
@Suppress("TooGenericExceptionCaught")
override fun intercept(chain: Interceptor.Chain): Response {
val request = chain.request()
val response = chain.proceed(request)
val hostname = request.url.host
return try {
if (response.code in SERVER_ERROR_RANGE && DNSCache.isIPV6First(hostname)) {
Log_OC.d(TAG, "Response error with IPv6, trying IPv4")
retryWithIPv4(hostname, chain, request)
} else {
response
}
} catch (e: Exception) {
if (DNSCache.isIPV6First(hostname) && (e is SocketTimeoutException || e is ConnectException)) {
return retryWithIPv4(hostname, chain, request)
}
throw e
}
}
private fun retryWithIPv4(
hostname: String,
chain: Interceptor.Chain,
request: Request
): Response {
Log_OC.d(TAG, "Error with IPv6, trying IPv4")
DNSCache.setIPVersionPreference(hostname, true)
connectionPool.evictAll()
return chain.proceed(request)
}
}
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