Add feature flag IdentityPinningViolationNotifications.

Disabled in production build, enabled by default on other builds.

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStatePresenter.kt

@@ -15,6 +15,8 @@ import androidx.compose.runtime.rememberCoroutineScope
 import io.element.android.libraries.architecture.Presenter
 import io.element.android.libraries.designsystem.components.avatar.AvatarData
 import io.element.android.libraries.designsystem.components.avatar.AvatarSize
+import io.element.android.libraries.featureflag.api.FeatureFlagService
+import io.element.android.libraries.featureflag.api.FeatureFlags
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.encryption.EncryptionService
 import io.element.android.libraries.matrix.api.room.MatrixRoom
@@ -31,7 +33,6 @@ import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.filter
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.launchIn
-import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
 import timber.log.Timber
@@ -40,6 +41,7 @@ import javax.inject.Inject
 class IdentityChangeStatePresenter @Inject constructor(
     private val room: MatrixRoom,
     private val encryptionService: EncryptionService,
+    private val featureFlagService: FeatureFlagService,
 ) : Presenter<IdentityChangeState> {
     @Composable
     override fun present(): IdentityChangeState {
@@ -62,14 +64,18 @@ class IdentityChangeStatePresenter @Inject constructor(
 
     @OptIn(ExperimentalCoroutinesApi::class)
     private fun ProduceStateScope<PersistentList<RoomMemberIdentityStateChange>>.observeRoomMemberIdentityStateChange() {
-        room.syncUpdateFlow
+        featureFlagService.isFeatureEnabledFlow(FeatureFlags.IdentityPinningViolationNotifications)
+            .filter { it }
+            .flatMapLatest {
+                room.syncUpdateFlow
+            }
             .filter {
                 // Room cannot become unencrypted, so we can just apply a filter here.
                 room.isEncrypted
             }
             .distinctUntilChanged()
             .flatMapLatest {
-                combine(room.identityStateChangesFlow, room.membersStateFlow,) { identityStateChanges, membersState ->
+                combine(room.identityStateChangesFlow, room.membersStateFlow) { identityStateChanges, membersState ->
                     identityStateChanges.map { identityStateChange ->
                         val member = membersState.roomMembers()
                             ?.firstOrNull { roomMember -> roomMember.userId == identityStateChange.userId }

features/messages/impl/src/test/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStatePresenterTest.kt

@@ -9,6 +9,9 @@ package io.element.android.features.messages.impl.crypto.identity
 
 import com.google.common.truth.Truth.assertThat
 import io.element.android.libraries.designsystem.components.avatar.AvatarSize
+import io.element.android.libraries.featureflag.api.FeatureFlagService
+import io.element.android.libraries.featureflag.api.FeatureFlags
+import io.element.android.libraries.featureflag.test.FakeFeatureFlagService
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.encryption.EncryptionService
 import io.element.android.libraries.matrix.api.encryption.identity.IdentityState
@@ -65,6 +68,43 @@ class IdentityChangeStatePresenterTest {
         }
     }
 
+    @Test
+    fun `present - when the room emits identity change, but the feature is disabled, the presenter emits new state`() = runTest {
+        val room = FakeMatrixRoom(
+            isEncrypted = true,
+        )
+        val featureFlagService = FakeFeatureFlagService(
+            initialState = mapOf(
+                FeatureFlags.IdentityPinningViolationNotifications.key to false,
+            )
+        )
+        val presenter = createIdentityChangeStatePresenter(
+            room = room,
+            featureFlagService = featureFlagService,
+        )
+        presenter.test {
+            val initialState = awaitItem()
+            assertThat(initialState.roomMemberIdentityStateChanges).isEmpty()
+            room.emitIdentityStateChanges(
+                listOf(
+                    IdentityStateChange(
+                        userId = A_USER_ID_2,
+                        identityState = IdentityState.PinViolation,
+                    ),
+                )
+            )
+            // No item emitted.
+            expectNoEvents()
+            // Enable the feature
+            featureFlagService.setFeatureEnabled(FeatureFlags.IdentityPinningViolationNotifications, true)
+            val finalItem = awaitItem()
+            assertThat(finalItem.roomMemberIdentityStateChanges).hasSize(1)
+            val value = finalItem.roomMemberIdentityStateChanges.first()
+            assertThat(value.identityRoomMember.userId).isEqualTo(A_USER_ID_2)
+            assertThat(value.identityState).isEqualTo(IdentityState.PinViolation)
+        }
+    }
+
     @Test
     fun `present - when the clear room emits identity change, the presenter does not emits new state`() = runTest {
         val room = FakeMatrixRoom(isEncrypted = false)
@@ -147,10 +187,16 @@ class IdentityChangeStatePresenterTest {
     private fun createIdentityChangeStatePresenter(
         room: MatrixRoom = FakeMatrixRoom(),
         encryptionService: EncryptionService = FakeEncryptionService(),
+        featureFlagService: FeatureFlagService = FakeFeatureFlagService(
+            initialState = mapOf(
+                FeatureFlags.IdentityPinningViolationNotifications.key to true,
+            )
+        ),
     ): IdentityChangeStatePresenter {
         return IdentityChangeStatePresenter(
             room = room,
             encryptionService = encryptionService,
+            featureFlagService = featureFlagService,
         )
     }
 }

libraries/featureflag/api/src/main/kotlin/io/element/android/libraries/featureflag/api/FeatureFlags.kt

@@ -132,4 +132,17 @@ enum class FeatureFlags(
         defaultValue = { false },
         isFinished = false,
     ),
+    IdentityPinningViolationNotifications(
+        key = "feature.identityPinningViolationNotifications",
+        title = "Identity pinning violation notifications",
+        description = null,
+        defaultValue = { buildMeta ->
+            when (buildMeta.buildType) {
+                // Do not enable this feature in release builds
+                BuildType.RELEASE -> false
+                else -> true
+            }
+        },
+        isFinished = false,
+    ),
 }