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/*
* Copyright © 2018 Samuel Holland <samuel@sholland.org>
* Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
* SPDX-License-Identifier: GPL-2.0-or-later
*/
package com.wireguard.android.model;
import android.content.SharedPreferences;
import android.databinding.BaseObservable;
import android.databinding.Bindable;
import android.support.annotation.NonNull;
import com.wireguard.android.Application.ApplicationScope;
import com.wireguard.android.BR;
import com.wireguard.android.backend.Backend;
import com.wireguard.android.configStore.ConfigStore;
import com.wireguard.android.model.Tunnel.State;
import com.wireguard.android.model.Tunnel.Statistics;
import com.wireguard.android.util.AsyncWorker;
import com.wireguard.android.util.ExceptionLoggers;
import com.wireguard.android.util.ObservableKeyedList;
import com.wireguard.android.util.ObservableSortedKeyedArrayList;
import com.wireguard.android.util.ObservableSortedKeyedList;
import com.wireguard.config.Config;
import java.util.Collection;
import java.util.Comparator;
import java.util.Set;
import javax.inject.Inject;
import java9.util.Comparators;
import java9.util.concurrent.CompletableFuture;
import java9.util.concurrent.CompletionStage;
import java9.util.stream.Collectors;
import java9.util.stream.StreamSupport;
/**
* Maintains and mediates changes to the set of available WireGuard tunnels,
*/
@ApplicationScope
public final class TunnelManager extends BaseObservable {
private static final Comparator<String> COMPARATOR = Comparators.<String>thenComparing(
String.CASE_INSENSITIVE_ORDER, Comparators.naturalOrder());
private static final String KEY_LAST_USED_TUNNEL = "last_used_tunnel";
private static final String KEY_RESTORE_ON_BOOT = "restore_on_boot";
private static final String KEY_RUNNING_TUNNELS = "enabled_configs";
private final AsyncWorker asyncWorker;
private final Backend backend;
private final ConfigStore configStore;
private final SharedPreferences preferences;
private final ObservableSortedKeyedList<String, Tunnel> tunnels =
new ObservableSortedKeyedArrayList<>(COMPARATOR);
private Tunnel lastUsedTunnel;
@Inject
public TunnelManager(final AsyncWorker asyncWorker, final Backend backend,
final ConfigStore configStore, final SharedPreferences preferences) {
this.asyncWorker = asyncWorker;
this.backend = backend;
this.configStore = configStore;
this.preferences = preferences;
}
private Tunnel addToList(final String name, final Config config, final State state) {
final Tunnel tunnel = new Tunnel(this, name, config, state);
tunnels.add(tunnel);
return tunnel;
}
public CompletionStage<Tunnel> create(@NonNull final String name, final Config config) {
if (Tunnel.isNameInvalid(name))
return CompletableFuture.failedFuture(new IllegalArgumentException("Invalid name"));
if (tunnels.containsKey(name)) {
final String message = "Tunnel " + name + " already exists";
return CompletableFuture.failedFuture(new IllegalArgumentException(message));
}
return asyncWorker.supplyAsync(() -> configStore.create(name, config))
.thenApply(savedConfig -> addToList(name, savedConfig, State.DOWN));
}
CompletionStage<Void> delete(final Tunnel tunnel) {
final State originalState = tunnel.getState();
final boolean wasLastUsed = tunnel == lastUsedTunnel;
// Make sure nothing touches the tunnel.
if (wasLastUsed)
setLastUsedTunnel(null);
tunnels.remove(tunnel);
return asyncWorker.runAsync(() -> {
if (originalState == State.UP)
backend.setState(tunnel, State.DOWN);
try {
configStore.delete(tunnel.getName());
} catch (final Exception e) {
if (originalState == State.UP)
backend.setState(tunnel, State.UP);
// Re-throw the exception to fail the completion.
throw e;
}
}).whenComplete((x, e) -> {
if (e == null)
return;
// Failure, put the tunnel back.
tunnels.add(tunnel);
if (wasLastUsed)
setLastUsedTunnel(tunnel);
});
}
@Bindable
public Tunnel getLastUsedTunnel() {
return lastUsedTunnel;
}
CompletionStage<Config> getTunnelConfig(final Tunnel tunnel) {
return asyncWorker.supplyAsync(() -> configStore.load(tunnel.getName()))
.thenApply(tunnel::onConfigChanged);
}
CompletionStage<State> getTunnelState(final Tunnel tunnel) {
return asyncWorker.supplyAsync(() -> backend.getState(tunnel))
.thenApply(tunnel::onStateChanged);
}
CompletionStage<Statistics> getTunnelStatistics(final Tunnel tunnel) {
return asyncWorker.supplyAsync(() -> backend.getStatistics(tunnel))
.thenApply(tunnel::onStatisticsChanged);
}
public ObservableKeyedList<String, Tunnel> getTunnels() {
return tunnels;
}
public void onCreate() {
asyncWorker.supplyAsync(configStore::enumerate)
.thenAcceptBoth(asyncWorker.supplyAsync(backend::enumerate), this::onTunnelsLoaded)
.whenComplete(ExceptionLoggers.E);
}
private void onTunnelsLoaded(final Iterable<String> present, final Collection<String> running) {
for (final String name : present)
addToList(name, null, running.contains(name) ? State.UP : State.DOWN);
final String lastUsedName = preferences.getString(KEY_LAST_USED_TUNNEL, null);
if (lastUsedName != null)
setLastUsedTunnel(tunnels.get(lastUsedName));
}
public void refreshTunnelStates() {
asyncWorker.supplyAsync(backend::enumerate)
.thenAccept(running -> {
for (final Tunnel tunnel : tunnels)
tunnel.onStateChanged(running.contains(tunnel.getName()) ? State.UP : State.DOWN);
})
.whenComplete(ExceptionLoggers.E);
}
public CompletionStage<Void> restoreState() {
if (!preferences.getBoolean(KEY_RESTORE_ON_BOOT, false))
return CompletableFuture.completedFuture(null);
final Set<String> previouslyRunning = preferences.getStringSet(KEY_RUNNING_TUNNELS, null);
if (previouslyRunning == null)
return CompletableFuture.completedFuture(null);
return CompletableFuture.allOf(StreamSupport.stream(tunnels)
.filter(tunnel -> previouslyRunning.contains(tunnel.getName()))
.map(tunnel -> setTunnelState(tunnel, State.UP))
.toArray(CompletableFuture[]::new));
}
public void saveState() {
final Set<String> runningTunnels = StreamSupport.stream(tunnels)
.filter(tunnel -> tunnel.getState() == State.UP)
.map(Tunnel::getName)
.collect(Collectors.toUnmodifiableSet());
preferences.edit().putStringSet(KEY_RUNNING_TUNNELS, runningTunnels).apply();
}
private void setLastUsedTunnel(final Tunnel tunnel) {
if (tunnel == lastUsedTunnel)
return;
lastUsedTunnel = tunnel;
notifyPropertyChanged(BR.lastUsedTunnel);
if (tunnel != null)
preferences.edit().putString(KEY_LAST_USED_TUNNEL, tunnel.getName()).apply();
else
preferences.edit().remove(KEY_LAST_USED_TUNNEL).apply();
}
CompletionStage<Config> setTunnelConfig(final Tunnel tunnel, final Config config) {
return asyncWorker.supplyAsync(() -> {
final Config appliedConfig = backend.applyConfig(tunnel, config);
return configStore.save(tunnel.getName(), appliedConfig);
}).thenApply(tunnel::onConfigChanged);
}
CompletionStage<String> setTunnelName(final Tunnel tunnel, final String name) {
if (Tunnel.isNameInvalid(name))
return CompletableFuture.failedFuture(new IllegalArgumentException("Invalid name"));
if (tunnels.containsKey(name)) {
final String message = "Tunnel " + name + " already exists";
return CompletableFuture.failedFuture(new IllegalArgumentException(message));
}
final State originalState = tunnel.getState();
final boolean wasLastUsed = tunnel == lastUsedTunnel;
// Make sure nothing touches the tunnel.
if (wasLastUsed)
setLastUsedTunnel(null);
tunnels.remove(tunnel);
return asyncWorker.supplyAsync(() -> {
if (originalState == State.UP)
backend.setState(tunnel, State.DOWN);
configStore.rename(tunnel.getName(), name);
final String newName = tunnel.onNameChanged(name);
if (originalState == State.UP)
backend.setState(tunnel, State.UP);
return newName;
}).whenComplete((newName, e) -> {
// On failure, we don't know what state the tunnel might be in. Fix that.
if (e != null)
getTunnelState(tunnel);
// Add the tunnel back to the manager, under whatever name it thinks it has.
tunnels.add(tunnel);
if (wasLastUsed)
setLastUsedTunnel(tunnel);
});
}
CompletionStage<State> setTunnelState(final Tunnel tunnel, final State state) {
// Ensure the configuration is loaded before trying to use it.
return tunnel.getConfigAsync().thenCompose(x ->
asyncWorker.supplyAsync(() -> backend.setState(tunnel, state))
).whenComplete((newState, e) -> {
// Ensure onStateChanged is always called (failure or not), and with the correct state.
tunnel.onStateChanged(e == null ? newState : tunnel.getState());
if (e == null && newState == State.UP)
setLastUsedTunnel(tunnel);
});
}
}
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