Store session data in a secure way (#98)

* Replace SessionData DataStore with an encrypted SQLite DB.

---------

Co-authored-by: Benoit Marty <benoit@matrix.org>

samples/minimal/build.gradle.kts

@@ -54,5 +54,6 @@ dependencies {
     implementation(projects.libraries.dateformatter)
     implementation(projects.features.roomlist)
     implementation(projects.features.login)
+    implementation(libs.coroutines.core)
     coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.0.2")
 }

samples/minimal/src/main/kotlin/io/element/android/samples/minimal/InMemorySessionStore.kt

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2023 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 io.element.android.samples.minimal
+
+import io.element.android.libraries.matrix.session.SessionData
+import io.element.android.libraries.sessionstorage.SessionStore
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.map
+
+class InMemorySessionStore : SessionStore {
+
+    private var sessionData = MutableStateFlow<SessionData?>(null)
+
+    override fun isLoggedIn(): Flow<Boolean> {
+        return sessionData.map { it != null }
+    }
+
+    override suspend fun storeData(session: SessionData) {
+        sessionData.value = session
+    }
+
+    override suspend fun getSession(sessionId: String): SessionData? {
+        return sessionData.value.takeIf { it?.userId == sessionId }
+    }
+
+    override suspend fun getLatestSession(): SessionData? {
+        return sessionData.value
+    }
+
+    override suspend fun removeSession(sessionId: String) {
+        if (sessionData.value?.userId == sessionId) {
+            sessionData.value = null
+        }
+    }
+}

samples/minimal/src/main/kotlin/io/element/android/samples/minimal/MainActivity.kt

@@ -31,7 +31,6 @@ import androidx.core.view.WindowCompat
 import io.element.android.libraries.designsystem.theme.ElementTheme
 import io.element.android.libraries.matrix.auth.MatrixAuthenticationService
 import io.element.android.libraries.matrix.auth.RustMatrixAuthenticationService
-import io.element.android.libraries.matrix.session.PreferencesSessionStore
 import kotlinx.coroutines.runBlocking
 import org.matrix.rustcomponents.sdk.AuthenticationService
 import java.io.File
@@ -45,7 +44,7 @@ class MainActivity : ComponentActivity() {
             baseDirectory = baseDirectory,
             coroutineScope = Singleton.appScope,
             coroutineDispatchers = Singleton.coroutineDispatchers,
-            sessionStore = PreferencesSessionStore(applicationContext),
+            sessionStore = InMemorySessionStore(),
             authService = AuthenticationService(baseDirectory.absolutePath, null, null),
         )
     }

samples/minimal/src/main/res/values-night/themes.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (c) 2023 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.
+  -->
+
+<resources>
+    <style name="Theme.ElementX" parent="android:Theme.Material.NoActionBar" />
+</resources>

samples/minimal/src/main/res/values/themes.xml

@@ -16,6 +16,5 @@
   -->
 
 <resources>
-
     <style name="Theme.ElementX" parent="android:Theme.Material.Light.NoActionBar" />
 </resources>