storing an retrieving the use case selection by user

- will enable multi account support in the future

vector/src/main/java/im/vector/app/core/extensions/DataStore.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2022 New Vector Ltd
+ *
+ * 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 im.vector.app.core.extensions
+
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.edit
+
+suspend fun DataStore<Preferences>.removeKeysWithPrefix(prefix: String) {
+    edit { preferences ->
+        val keysToRemove = preferences.asMap().keys.filter { key -> key.name.startsWith(prefix) }
+        keysToRemove.forEach {
+            preferences.remove(it)
+        }
+    }
+}

vector/src/main/java/im/vector/app/features/MainActivity.kt

@@ -151,7 +151,7 @@ class MainActivity : VectorBaseActivity<ActivityMainBinding>(), UnlockedActivity
                     // Just do the local cleanup
                     Timber.w("Account deactivated, start app")
                     sessionHolder.clearActiveSession()
-                    doLocalCleanup(clearPreferences = true)
+                    doLocalCleanup(clearPreferences = true, userId = session.myUserId)
                     startNextActivityAndFinish()
                 }
             }
@@ -165,14 +165,14 @@ class MainActivity : VectorBaseActivity<ActivityMainBinding>(), UnlockedActivity
                     }
                     Timber.w("SIGN_OUT: success, start app")
                     sessionHolder.clearActiveSession()
-                    doLocalCleanup(clearPreferences = true)
+                    doLocalCleanup(clearPreferences = true, userId = session.myUserId)
                     startNextActivityAndFinish()
                 }
             }
             args.clearCache           -> {
                 lifecycleScope.launch {
                     session.clearCache()
-                    doLocalCleanup(clearPreferences = false)
+                    doLocalCleanup(clearPreferences = false, userId = session.myUserId)
                     session.startSyncing(applicationContext)
                     startNextActivityAndFinish()
                 }
@@ -185,7 +185,7 @@ class MainActivity : VectorBaseActivity<ActivityMainBinding>(), UnlockedActivity
         Timber.w("Ignoring invalid token global error")
     }
 
-    private suspend fun doLocalCleanup(clearPreferences: Boolean) {
+    private suspend fun doLocalCleanup(clearPreferences: Boolean, userId: String) {
         // On UI Thread
         Glide.get(this@MainActivity).clearMemory()
 
@@ -195,7 +195,7 @@ class MainActivity : VectorBaseActivity<ActivityMainBinding>(), UnlockedActivity
             pinLocker.unlock()
             pinCodeStore.deleteEncodedPin()
             vectorAnalytics.onSignOut()
-            onboardingStore.clear()
+            onboardingStore.clear(userId)
         }
         withContext(Dispatchers.IO) {
             // On BG thread

vector/src/main/java/im/vector/app/features/onboarding/OnboardingViewModel.kt

@@ -753,7 +753,7 @@ class OnboardingViewModel @AssistedInject constructor(
 
     private suspend fun onSessionCreated(session: Session) {
         awaitState().useCase?.let { useCase ->
-            onboardingStore.setUseCase(useCase)
+            onboardingStore.setUseCase(userId = session.myUserId, useCase)
         }
         activeSessionHolder.setActiveSession(session)
 

vector/src/main/java/im/vector/app/features/onboarding/store/OnboardingStore.kt

@@ -22,6 +22,7 @@ import androidx.datastore.preferences.core.Preferences
 import androidx.datastore.preferences.core.edit
 import androidx.datastore.preferences.core.stringPreferencesKey
 import androidx.datastore.preferences.preferencesDataStore
+import im.vector.app.core.extensions.removeKeysWithPrefix
 import im.vector.app.features.onboarding.FtueUseCase
 import kotlinx.coroutines.flow.first
 import javax.inject.Inject
@@ -35,25 +36,25 @@ private val Context.dataStore: DataStore<Preferences> by preferencesDataStore(na
 class OnboardingStore @Inject constructor(
         private val context: Context
 ) {
-    private val useCaseKey = stringPreferencesKey("use_case")
+    suspend fun readUseCase(userId: String) = context.dataStore.data.first().let { preferences ->
-
+        preferences[userId.toUseCaseKey()]?.let { FtueUseCase.from(it) }
-    suspend fun readUseCase() = context.dataStore.data.first().let { preferences ->
-        preferences[useCaseKey]?.let { FtueUseCase.from(it) }
     }
 
-    suspend fun setUseCase(useCase: FtueUseCase) {
+    suspend fun setUseCase(userId: String, useCase: FtueUseCase) {
         context.dataStore.edit { settings ->
-            settings[useCaseKey] = useCase.persistableValue
+            settings[userId.toUseCaseKey()] = useCase.persistableValue
         }
     }
 
-    suspend fun resetUseCase() {
+    suspend fun resetUseCase(userId: String) {
         context.dataStore.edit { settings ->
-            settings.remove(useCaseKey)
+            settings.remove(userId.toUseCaseKey())
         }
     }
 
-    suspend fun clear() {
+    suspend fun clear(userId: String) {
-        context.dataStore.edit { it.clear() }
+        context.dataStore.removeKeysWithPrefix(userId)
     }
+
+    private fun String.toUseCaseKey() = stringPreferencesKey("$this-use_case")
 }