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/*
* Copyright (C) 2023 MURENA SAS
* Copyright (C) 2021 E FOUNDATION
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package foundation.e.advancedprivacy.domain.usecases
import android.content.Intent
import foundation.e.advancedprivacy.common.isStandaloneBuild
import foundation.e.advancedprivacy.data.repositories.AppListsRepository
import foundation.e.advancedprivacy.data.repositories.LocalStateRepository
import foundation.e.advancedprivacy.domain.entities.ApplicationDescription
import foundation.e.advancedprivacy.domain.entities.InternetPrivacyMode
import foundation.e.advancedprivacy.domain.entities.InternetPrivacyMode.HIDE_IP
import foundation.e.advancedprivacy.domain.entities.InternetPrivacyMode.HIDE_IP_LOADING
import foundation.e.advancedprivacy.domain.entities.InternetPrivacyMode.REAL_IP
import foundation.e.advancedprivacy.domain.entities.InternetPrivacyMode.REAL_IP_LOADING
import foundation.e.advancedprivacy.externalinterfaces.permissions.IPermissionsPrivacyModule
import foundation.e.advancedprivacy.ipscrambler.IpScramblerModule
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.channels.awaitClose
import kotlinx.coroutines.delay
import kotlinx.coroutines.flow.SharingStarted
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.callbackFlow
import kotlinx.coroutines.flow.stateIn
import kotlinx.coroutines.launch
class IpScramblingStateUseCase(
private val ipScramblerModule: IpScramblerModule,
private val permissionsPrivacyModule: IPermissionsPrivacyModule,
private val appDesc: ApplicationDescription,
private val localStateRepository: LocalStateRepository,
private val appListsRepository: AppListsRepository,
private val coroutineScope: CoroutineScope
) {
val internetPrivacyMode: StateFlow<InternetPrivacyMode> = callbackFlow {
val listener = object : IpScramblerModule.Listener {
override fun onStatusChanged(newStatus: IpScramblerModule.Status) {
trySend(map(newStatus))
}
override fun log(message: String) {}
override fun onTrafficUpdate(
upload: Long,
download: Long,
read: Long,
write: Long
) {
}
}
ipScramblerModule.addListener(listener)
ipScramblerModule.requestStatus()
awaitClose { ipScramblerModule.removeListener(listener) }
}.stateIn(
scope = coroutineScope,
started = SharingStarted.Eagerly,
initialValue = REAL_IP
)
init {
coroutineScope.launch(Dispatchers.Default) {
localStateRepository.ipScramblingSetting.collect {
applySettings(it)
}
}
coroutineScope.launch(Dispatchers.IO) {
internetPrivacyMode.collect {
if (
it == REAL_IP &&
localStateRepository.internetPrivacyMode.value == REAL_IP_LOADING
) {
// Wait for orbot to relax before allowing user to reactivate it.
delay(1000)
}
localStateRepository.internetPrivacyMode.value = it
}
}
}
fun toggle(hideIp: Boolean) {
localStateRepository.setIpScramblingSetting(enabled = hideIp)
}
private fun getHiddenPackageNames(): List<String> {
return appListsRepository.getMainProfileHiddenSystemApps().map { it.packageName }
}
val bypassTorApps: Set<String> get() {
var whitelist = ipScramblerModule.appList
if (getHiddenPackageNames().any { it in whitelist }) {
val mutable = whitelist.toMutableSet()
mutable.removeAll(getHiddenPackageNames())
mutable.add(appListsRepository.dummySystemApp.packageName)
whitelist = mutable
}
if (AppListsRepository.compatibiltyPNames.any { it in whitelist }) {
val mutable = whitelist.toMutableSet()
mutable.removeAll(AppListsRepository.compatibiltyPNames)
mutable.add(appListsRepository.dummyCompatibilityApp.packageName)
whitelist = mutable
}
return whitelist
}
fun toggleBypassTor(packageName: String) {
val visibleList = bypassTorApps.toMutableSet()
val rawList = ipScramblerModule.appList.toMutableSet()
if (visibleList.contains(packageName)) {
if (packageName == appListsRepository.dummySystemApp.packageName) {
rawList.removeAll(getHiddenPackageNames())
} else if (packageName == appListsRepository.dummyCompatibilityApp.packageName) {
rawList.removeAll(AppListsRepository.compatibiltyPNames)
} else {
rawList.remove(packageName)
}
} else {
if (packageName == appListsRepository.dummySystemApp.packageName) {
rawList.addAll(getHiddenPackageNames())
} else if (packageName == appListsRepository.dummyCompatibilityApp.packageName) {
rawList.addAll(AppListsRepository.compatibiltyPNames)
} else {
rawList.add(packageName)
}
}
ipScramblerModule.appList = rawList
}
private suspend fun applySettings(isIpScramblingEnabled: Boolean) {
val currentMode = localStateRepository.internetPrivacyMode.value
when {
isIpScramblingEnabled && currentMode in setOf(REAL_IP, REAL_IP_LOADING) ->
applyStartIpScrambling()
!isIpScramblingEnabled && currentMode in setOf(HIDE_IP, HIDE_IP_LOADING) ->
ipScramblerModule.stop()
else -> {}
}
}
private suspend fun applyStartIpScrambling() {
val authorizeVpnIntent = ipScramblerModule.prepareAndroidVpn()
if (authorizeVpnIntent == null) {
localStateRepository.emitStartVpnDisclaimer(null)
startIpScrambling()
return
}
acquireVpnAuthorization(authorizeVpnIntent)
}
private suspend fun acquireVpnAuthorization(authorizeVpnIntent: Intent) {
val authorized = permissionsPrivacyModule.setVpnPackageAuthorization(appDesc.packageName)
val alwaysOnVpnPackage = permissionsPrivacyModule.getAlwaysOnVpnPackage()
when {
authorized && alwaysOnVpnPackage == null -> {
localStateRepository.emitStartVpnDisclaimer(null)
startIpScrambling()
}
authorized && alwaysOnVpnPackage != null -> {
localStateRepository.emitOtherVpnRunning(
permissionsPrivacyModule.getApplicationDescription(
packageName = alwaysOnVpnPackage,
withIcon = false
)
)
localStateRepository.setIpScramblingSetting(enabled = false)
}
else -> localStateRepository.emitStartVpnDisclaimer(authorizeVpnIntent)
}
}
fun startIpScrambling() {
localStateRepository.internetPrivacyMode.value = HIDE_IP_LOADING
ipScramblerModule.start(enableNotification = isStandaloneBuild)
}
private fun map(status: IpScramblerModule.Status): InternetPrivacyMode {
return when (status) {
IpScramblerModule.Status.OFF -> REAL_IP
IpScramblerModule.Status.ON -> HIDE_IP
IpScramblerModule.Status.STARTING -> HIDE_IP_LOADING
IpScramblerModule.Status.STOPPING,
IpScramblerModule.Status.START_DISABLED -> REAL_IP_LOADING
}
}
}
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