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/*
* Copyright © 2017-2023 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.android.model
import android.util.Log
import androidx.databinding.BaseObservable
import androidx.databinding.Bindable
import com.wireguard.android.Application
import com.wireguard.android.BR
import com.wireguard.android.backend.Dhcp
import com.wireguard.android.backend.Statistics
import com.wireguard.android.backend.Tunnel
import com.wireguard.android.databinding.Keyed
import com.wireguard.android.util.applicationScope
import com.wireguard.android.viewmodel.ConfigDetail
import com.wireguard.android.viewmodel.PeerDetail
import com.wireguard.config.Config
import com.wireguard.config.InetEndpoint
import com.wireguard.config.InetNetwork
import com.wireguard.crypto.Key
import java.util.Optional
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
/**
* Encapsulates the volatile and nonvolatile state of a WireGuard tunnel.
*/
class ObservableTunnel internal constructor(
private val manager: TunnelManager,
private var name: String,
config: Config?,
state: Tunnel.State
) : BaseObservable(), Keyed<String>, Tunnel {
override val key
get() = name
@Bindable
override fun getName() = name
suspend fun setNameAsync(name: String): String = withContext(Dispatchers.Main.immediate) {
if (name != this@ObservableTunnel.name)
manager.setTunnelName(this@ObservableTunnel, name)
else
this@ObservableTunnel.name
}
fun onNameChanged(name: String): String {
this.name = name
notifyPropertyChanged(BR.name)
return name
}
@get:Bindable
var state = state
private set
override fun onStateChange(newState: Tunnel.State) {
onStateChanged(newState)
}
fun onStateChanged(state: Tunnel.State): Tunnel.State {
if (state != Tunnel.State.UP) {
onStatisticsChanged(null)
onDhcpChanged(null)
Application.getCoroutineScope().launch {
onPeersReset()
}
} else {
configDetail?.peers?.forEach {
var endpoint: InetEndpoint? = it.peer?.endpoint?.orElse(null)
it.endpoint = Optional.ofNullable(endpoint?.getResolved()?.get())
}
}
this.state = state
notifyPropertyChanged(BR.state)
return state
}
suspend fun setStateAsync(state: Tunnel.State): Tunnel.State = withContext(Dispatchers.Main.immediate) {
if (state != this@ObservableTunnel.state)
manager.setTunnelState(this@ObservableTunnel, state)
else
this@ObservableTunnel.state
}
private var configDetail: ConfigDetail? = if (config != null) ConfigDetail(config) else null
@get:Bindable
var config = config
get() {
if (field == null)
// Opportunistically fetch this if we don't have a cached one, and rely on data bindings to update it eventually
applicationScope.launch {
try {
manager.getTunnelConfig(this@ObservableTunnel)
} catch (e: Throwable) {
Log.e(TAG, Log.getStackTraceString(e))
}
}
return field
}
private set
suspend fun getConfigAsync(): Config = withContext(Dispatchers.Main.immediate) {
config ?: manager.getTunnelConfig(this@ObservableTunnel).config!!
}
suspend fun getConfigDetailAsync(): ConfigDetail = withContext(Dispatchers.Main.immediate) {
configDetail ?: manager.getTunnelConfig(this@ObservableTunnel)
}
suspend fun setConfigAsync(config: Config): Config = withContext(Dispatchers.Main.immediate) {
this@ObservableTunnel.config.let {
if (config != it)
manager.setTunnelConfig(this@ObservableTunnel, config)
else
it
}
}
fun onConfigChanged(config: Config?): ConfigDetail? {
this.configDetail = ConfigDetail(config)
this.config = config
notifyPropertyChanged(BR.config)
return configDetail
}
@get:Bindable
var statistics: Statistics? = null
get() {
if (field == null || field?.isStale != false)
// Opportunistically fetch this if we don't have a cached one, and rely on data bindings to update it eventually
applicationScope.launch {
try {
manager.getTunnelStatistics(this@ObservableTunnel)
} catch (e: Throwable) {
Log.e(TAG, Log.getStackTraceString(e))
}
}
return field
}
private set
suspend fun getStatisticsAsync(): Statistics = withContext(Dispatchers.Main.immediate) {
statistics.let {
if (it == null || it.isStale)
manager.getTunnelStatistics(this@ObservableTunnel)
else
it
}
}
fun onStatisticsChanged(statistics: Statistics?): Statistics? {
this.statistics = statistics
notifyPropertyChanged(BR.statistics)
return statistics
}
@get:Bindable
var dhcp: Dhcp? = null
private set
override fun onDhcpChange(newDhcp: Dhcp) {
onDhcpChanged(newDhcp)
}
fun onDhcpChanged(dhcp: Dhcp?): Dhcp? {
this.dhcp = dhcp
notifyPropertyChanged(BR.dhcp)
return dhcp
}
// Remove dynamic peers, and reset static peers
fun onPeersReset() {
Log.i(TAG, "ObservableTunnel onPeersReset")
var toRemove: MutableList<PeerDetail> = ArrayList()
configDetail?.peers?.forEach {
if (it.peer == null) {
toRemove.add(it)
} else {
it.endpoint = Optional.empty()
}
}
toRemove.forEach {
Log.i(TAG, "ObservableTunnel remove " + it)
configDetail?.peers?.remove(it)
}
}
override fun onEndpointChange(publicKey: Key, newEndpoint: InetEndpoint?) {
Application.getCoroutineScope().launch {
onEndpointChanged(publicKey, newEndpoint)
}
}
private fun onEndpointChanged(publicKey: Key, newEndpoint: InetEndpoint?) {
Log.i(TAG, "ObservableTunnel onEndpointChange " + newEndpoint)
var peer: PeerDetail? = null
configDetail?.peers?.forEach {
if (it.publicKey.equals(publicKey) == true) {
Log.i(TAG, "ObservableTunnel peer " + it + ", " + it.peer)
peer = it;
}
}
if (peer == null) {
Log.i(TAG, "ObservableTunnel create peer " + publicKey)
peer = PeerDetail(publicKey)
configDetail?.peers?.add(peer)
}
var peer2: PeerDetail = peer!!
if (newEndpoint != null) {
peer2.endpoint = newEndpoint.getResolved()
} else {
var peer3 = peer2.peer
peer2.endpoint = if (peer3 != null) peer3.endpoint else Optional.empty()
}
}
fun lookupPeer(publicKey: Key): PeerDetail {
configDetail?.peers?.forEach {
if (it.publicKey.equals(publicKey) == true) {
Log.i(TAG, "ObservableTunnel peer " + it + ", " + it.peer)
return it
}
}
Log.i(TAG, "ObservableTunnel create peer " + publicKey)
var peer: PeerDetail = PeerDetail(publicKey)
configDetail?.peers?.add(peer)
return peer
}
override fun onAllowedIpsChange(publicKey: Key, addNetworks: List<InetNetwork>?, removeNetworks: List<InetNetwork>?) {
Application.getCoroutineScope().launch {
onAllowedIpsChanged(publicKey, addNetworks, removeNetworks)
}
}
private fun onAllowedIpsChanged(publicKey: Key, addNetworks: List<InetNetwork>?, removeNetworks: List<InetNetwork>?) {
var peer: PeerDetail = lookupPeer(publicKey)
removeNetworks?.let() {
peer.allowedIps.removeAll(removeNetworks)
}
addNetworks?.let() {
peer.allowedIps.addAll(addNetworks)
}
}
suspend fun deleteAsync() = manager.delete(this)
companion object {
private const val TAG = "WireGuard/ObservableTunnel"
}
}
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