Allow user with enough power level to redact other's messages (#969)

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/MessagesPresenter.kt

@@ -71,6 +71,7 @@ import io.element.android.libraries.matrix.api.room.MatrixRoomMembersState
 import io.element.android.libraries.matrix.api.room.MessageEventType
 import io.element.android.libraries.matrix.ui.components.AttachmentThumbnailInfo
 import io.element.android.libraries.matrix.ui.components.AttachmentThumbnailType
+import io.element.android.libraries.matrix.ui.room.canRedactAsState
 import io.element.android.libraries.matrix.ui.room.canSendMessageAsState
 import io.element.android.libraries.textcomposer.MessageComposerMode
 import kotlinx.coroutines.CoroutineScope
@@ -109,6 +110,7 @@ class MessagesPresenter @AssistedInject constructor(
 
         val syncUpdateFlow = room.syncUpdateFlow.collectAsState()
         val userHasPermissionToSendMessage by room.canSendMessageAsState(type = MessageEventType.ROOM_MESSAGE, updateKey = syncUpdateFlow.value)
+        val userHasPermissionToRedact by room.canRedactAsState(updateKey = syncUpdateFlow.value)
         var roomName: Async<String> by remember { mutableStateOf(Async.Uninitialized) }
         var roomAvatar: Async<AvatarData> by remember { mutableStateOf(Async.Uninitialized) }
         LaunchedEffect(syncUpdateFlow.value) {
@@ -165,6 +167,7 @@ class MessagesPresenter @AssistedInject constructor(
             roomName = roomName,
             roomAvatar = roomAvatar,
             userHasPermissionToSendMessage = userHasPermissionToSendMessage,
+            userHasPermissionToRedact = userHasPermissionToRedact,
             composerState = composerState,
             timelineState = timelineState,
             actionListState = actionListState,

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/MessagesState.kt

@@ -33,6 +33,7 @@ data class MessagesState(
     val roomName: Async<String>,
     val roomAvatar: Async<AvatarData>,
     val userHasPermissionToSendMessage: Boolean,
+    val userHasPermissionToRedact: Boolean,
     val composerState: MessageComposerState,
     val timelineState: TimelineState,
     val actionListState: ActionListState,

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/MessagesStateProvider.kt

@@ -50,6 +50,7 @@ fun aMessagesState() = MessagesState(
     roomName = Async.Success("Room name"),
     roomAvatar = Async.Success(AvatarData("!id:domain", "Room name", size = AvatarSize.TimelineRoom)),
     userHasPermissionToSendMessage = true,
+    userHasPermissionToRedact = false,
     composerState = aMessageComposerState().copy(
         text = "Hello",
         isFullScreen = false,

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/MessagesView.kt

@@ -115,7 +115,7 @@ fun MessagesView(
     fun onMessageLongClicked(event: TimelineItem.Event) {
         Timber.v("OnMessageLongClicked= ${event.id}")
         localView.hideKeyboard()
-        state.actionListState.eventSink(ActionListEvents.ComputeForMessage(event))
+        state.actionListState.eventSink(ActionListEvents.ComputeForMessage(event, state.userHasPermissionToRedact))
     }
 
     fun onActionSelected(action: TimelineItemAction, event: TimelineItem.Event) {

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/actionlist/ActionListEvents.kt

@@ -20,5 +20,5 @@ import io.element.android.features.messages.impl.timeline.model.TimelineItem
 
 sealed interface ActionListEvents {
     object Clear : ActionListEvents
-    data class ComputeForMessage(val event: TimelineItem.Event) : ActionListEvents
+    data class ComputeForMessage(val event: TimelineItem.Event, val canRedact: Boolean) : ActionListEvents
 }

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/actionlist/ActionListPresenter.kt

@@ -54,7 +54,11 @@ class ActionListPresenter @Inject constructor(
         fun handleEvents(event: ActionListEvents) {
             when (event) {
                 ActionListEvents.Clear -> target.value = ActionListState.Target.None
-                is ActionListEvents.ComputeForMessage -> localCoroutineScope.computeForMessage(event.event, target)
+                is ActionListEvents.ComputeForMessage -> localCoroutineScope.computeForMessage(
+                    timelineItem = event.event,
+                    userCanRedact = event.canRedact,
+                    target = target,
+                )
             }
         }
 
@@ -65,7 +69,11 @@ class ActionListPresenter @Inject constructor(
         )
     }
 
-    private fun CoroutineScope.computeForMessage(timelineItem: TimelineItem.Event, target: MutableState<ActionListState.Target>) = launch {
+    private fun CoroutineScope.computeForMessage(
+        timelineItem: TimelineItem.Event,
+        userCanRedact: Boolean,
+        target: MutableState<ActionListState.Target>
+    ) = launch {
         target.value = ActionListState.Target.Loading(timelineItem)
         val actions =
             when (timelineItem.content) {
@@ -102,7 +110,7 @@ class ActionListPresenter @Inject constructor(
                     if (!timelineItem.isMine) {
                         add(TimelineItemAction.ReportContent)
                     }
-                    if (timelineItem.isMine) {
+                    if (timelineItem.isMine || userCanRedact) {
                         add(TimelineItemAction.Redact)
                     }
                 }

features/messages/impl/src/test/kotlin/io/element/android/features/messages/MessagesPresenterTest.kt

@@ -44,8 +44,11 @@ import io.element.android.features.messages.media.FakeLocalMediaFactory
 import io.element.android.features.messages.utils.messagesummary.FakeMessageSummaryFormatter
 import io.element.android.features.networkmonitor.test.FakeNetworkMonitor
 import io.element.android.libraries.androidutils.clipboard.FakeClipboardHelper
+import io.element.android.libraries.architecture.Async
 import io.element.android.libraries.core.coroutine.CoroutineDispatchers
 import io.element.android.libraries.core.mimetype.MimeTypes
+import io.element.android.libraries.designsystem.components.avatar.AvatarData
+import io.element.android.libraries.designsystem.components.avatar.AvatarSize
 import io.element.android.libraries.designsystem.utils.SnackbarDispatcher
 import io.element.android.libraries.featureflag.test.FakeFeatureFlagService
 import io.element.android.libraries.matrix.api.media.MediaSource
@@ -83,9 +86,16 @@ class MessagesPresenterTest {
         moleculeFlow(RecompositionMode.Immediate) {
             presenter.present()
         }.test {
-            skipItems(1)
+            val initialState = consumeItemsUntilTimeout().last()
-            val initialState = awaitItem()
             assertThat(initialState.roomId).isEqualTo(A_ROOM_ID)
+            assertThat(initialState.roomName).isEqualTo(Async.Success(""))
+            assertThat(initialState.roomAvatar).isEqualTo(Async.Success(AvatarData(id = A_ROOM_ID.value, name = "", size = AvatarSize.TimelineRoom)))
+            assertThat(initialState.userHasPermissionToSendMessage).isTrue()
+            assertThat(initialState.userHasPermissionToRedact).isFalse()
+            assertThat(initialState.hasNetworkConnection).isTrue()
+            assertThat(initialState.snackbarMessage).isNull()
+            assertThat(initialState.inviteProgress).isEqualTo(Async.Uninitialized)
+            assertThat(initialState.showReinvitePrompt).isFalse()
         }
     }
 
@@ -531,6 +541,18 @@ class MessagesPresenterTest {
         }
     }
 
+    @Test
+    fun `present - permission to redact`() = runTest {
+        val matrixRoom = FakeMatrixRoom(canRedact = true)
+        val presenter = createMessagePresenter(matrixRoom = matrixRoom)
+        moleculeFlow(RecompositionMode.Immediate) {
+            presenter.present()
+        }.test {
+            val initialState = consumeItemsUntilTimeout().last()
+            assertThat(initialState.userHasPermissionToRedact).isTrue()
+        }
+    }
+
     private fun TestScope.createMessagePresenter(
         coroutineDispatchers: CoroutineDispatchers = testCoroutineDispatchers(),
         matrixRoom: MatrixRoom = FakeMatrixRoom(),

features/messages/impl/src/test/kotlin/io/element/android/features/messages/actionlist/ActionListPresenterTest.kt

@@ -56,7 +56,7 @@ class ActionListPresenterTest {
         }.test {
             val initialState = awaitItem()
             val messageEvent = aMessageEvent(isMine = true, content = TimelineItemRedactedContent)
-            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent))
+            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent, false))
             // val loadingState = awaitItem()
             // assertThat(loadingState.target).isEqualTo(ActionListState.Target.Loading(messageEvent))
             val successState = awaitItem()
@@ -81,7 +81,7 @@ class ActionListPresenterTest {
         }.test {
             val initialState = awaitItem()
             val messageEvent = aMessageEvent(isMine = false, content = TimelineItemRedactedContent)
-            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent))
+            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent, false))
             // val loadingState = awaitItem()
             // assertThat(loadingState.target).isEqualTo(ActionListState.Target.Loading(messageEvent))
             val successState = awaitItem()
@@ -109,7 +109,7 @@ class ActionListPresenterTest {
                 isMine = false,
                 content = TimelineItemTextContent(body = A_MESSAGE, htmlDocument = null, isEdited = false)
             )
-            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent))
+            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent, false))
             // val loadingState = awaitItem()
             // assertThat(loadingState.target).isEqualTo(ActionListState.Target.Loading(messageEvent))
             val successState = awaitItem()
@@ -130,6 +130,37 @@ class ActionListPresenterTest {
         }
     }
 
+    @Test
+    fun `present - compute for others message and can redact`() = runTest {
+        val presenter = anActionListPresenter(isBuildDebuggable = true)
+        moleculeFlow(RecompositionMode.Immediate) {
+            presenter.present()
+        }.test {
+            val initialState = awaitItem()
+            val messageEvent = aMessageEvent(
+                isMine = false,
+                content = TimelineItemTextContent(body = A_MESSAGE, htmlDocument = null, isEdited = false)
+            )
+            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent, true))
+            val successState = awaitItem()
+            assertThat(successState.target).isEqualTo(
+                ActionListState.Target.Success(
+                    messageEvent,
+                    persistentListOf(
+                        TimelineItemAction.Reply,
+                        TimelineItemAction.Forward,
+                        TimelineItemAction.Copy,
+                        TimelineItemAction.Developer,
+                        TimelineItemAction.ReportContent,
+                        TimelineItemAction.Redact,
+                    )
+                )
+            )
+            initialState.eventSink.invoke(ActionListEvents.Clear)
+            assertThat(awaitItem().target).isEqualTo(ActionListState.Target.None)
+        }
+    }
+
     @Test
     fun `present - compute for my message`() = runTest {
         val presenter = anActionListPresenter(isBuildDebuggable = true)
@@ -141,7 +172,7 @@ class ActionListPresenterTest {
                 isMine = true,
                 content = TimelineItemTextContent(body = A_MESSAGE, htmlDocument = null, isEdited = false)
             )
-            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent))
+            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent, false))
             // val loadingState = awaitItem()
             // assertThat(loadingState.target).isEqualTo(ActionListState.Target.Loading(messageEvent))
             val successState = awaitItem()
@@ -174,7 +205,7 @@ class ActionListPresenterTest {
                 isMine = true,
                 content = aTimelineItemImageContent(),
             )
-            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent))
+            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent, false))
             // val loadingState = awaitItem()
             // assertThat(loadingState.target).isEqualTo(ActionListState.Target.Loading(messageEvent))
             val successState = awaitItem()
@@ -205,7 +236,7 @@ class ActionListPresenterTest {
                 isMine = true,
                 content = aTimelineItemStateEventContent(),
             )
-            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(stateEvent))
+            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(stateEvent, false))
             // val loadingState = awaitItem()
             // assertThat(loadingState.target).isEqualTo(ActionListState.Target.Loading(messageEvent))
             val successState = awaitItem()
@@ -234,7 +265,7 @@ class ActionListPresenterTest {
                 isMine = true,
                 content = aTimelineItemStateEventContent(),
             )
-            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(stateEvent))
+            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(stateEvent, false))
             // val loadingState = awaitItem()
             // assertThat(loadingState.target).isEqualTo(ActionListState.Target.Loading(messageEvent))
             val successState = awaitItem()
@@ -262,7 +293,7 @@ class ActionListPresenterTest {
                 isMine = true,
                 content = TimelineItemTextContent(body = A_MESSAGE, htmlDocument = null, isEdited = false)
             )
-            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent))
+            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent, false))
             // val loadingState = awaitItem()
             // assertThat(loadingState.target).isEqualTo(ActionListState.Target.Loading(messageEvent))
             val successState = awaitItem()
@@ -299,10 +330,10 @@ class ActionListPresenterTest {
                 content = TimelineItemRedactedContent,
             )
 
-            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent))
+            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent, false))
             assertThat(awaitItem().target).isInstanceOf(ActionListState.Target.Success::class.java)
 
-            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(redactedEvent))
+            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(redactedEvent, false))
             awaitItem().run {
                 assertThat(target).isEqualTo(ActionListState.Target.None)
                 assertThat(displayEmojiReactions).isFalse()
@@ -323,7 +354,7 @@ class ActionListPresenterTest {
                 content = TimelineItemTextContent(body = A_MESSAGE, htmlDocument = null, isEdited = false),
             )
 
-            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent))
+            initialState.eventSink.invoke(ActionListEvents.ComputeForMessage(messageEvent, false))
             val successState = awaitItem()
             assertThat(successState.target).isEqualTo(
                 ActionListState.Target.Success(

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/MatrixRoom.kt

@@ -105,6 +105,8 @@ interface MatrixRoom : Closeable {
 
     suspend fun canUserInvite(userId: UserId): Result<Boolean>
 
+    suspend fun canUserRedact(userId: UserId): Result<Boolean>
+
     suspend fun canUserSendState(userId: UserId, type: StateEventType): Result<Boolean>
 
     suspend fun canUserSendMessage(userId: UserId, type: MessageEventType): Result<Boolean>

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/powerlevels/MatrixRoomPowerLevels.kt

@@ -34,3 +34,9 @@ suspend fun MatrixRoom.canSendState(type: StateEventType): Result<Boolean> = can
  * Shortcut for calling [MatrixRoom.canUserSendMessage] with our own user.
  */
 suspend fun MatrixRoom.canSendMessage(type: MessageEventType): Result<Boolean> = canUserSendMessage(sessionId, type)
+
+/**
+ * Shortcut for calling [MatrixRoom.canUserRedact] with our own user.
+ */
+suspend fun MatrixRoom.canRedact(): Result<Boolean> = canUserRedact(sessionId)
+

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/room/RustMatrixRoom.kt

@@ -250,6 +250,12 @@ class RustMatrixRoom(
         }
     }
 
+    override suspend fun canUserRedact(userId: UserId): Result<Boolean> {
+        return runCatching {
+            innerRoom.canUserRedact(userId.value)
+        }
+    }
+
     override suspend fun canUserSendState(userId: UserId, type: StateEventType): Result<Boolean> {
         return runCatching {
             innerRoom.canUserSendState(userId.value, type.map())

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/room/FakeMatrixRoom.kt

@@ -56,6 +56,7 @@ class FakeMatrixRoom(
     override val joinedMemberCount: Long = 123L,
     override val activeMemberCount: Long = 234L,
     private val matrixTimeline: MatrixTimeline = FakeMatrixTimeline(),
+    canRedact: Boolean = false,
 ) : MatrixRoom {
 
     private var ignoreResult: Result<Unit> = Result.success(Unit)
@@ -66,6 +67,7 @@ class FakeMatrixRoom(
     private var joinRoomResult = Result.success(Unit)
     private var inviteUserResult = Result.success(Unit)
     private var canInviteResult = Result.success(true)
+    private var canRedactResult = Result.success(canRedact)
     private val canSendStateResults = mutableMapOf<StateEventType, Result<Boolean>>()
     private val canSendEventResults = mutableMapOf<MessageEventType, Result<Boolean>>()
     private var sendMediaResult = Result.success(Unit)
@@ -207,6 +209,10 @@ class FakeMatrixRoom(
         return canInviteResult
     }
 
+    override suspend fun canUserRedact(userId: UserId): Result<Boolean> {
+        return canRedactResult
+    }
+
     override suspend fun canUserSendState(userId: UserId, type: StateEventType): Result<Boolean> {
         return canSendStateResults[type] ?: Result.failure(IllegalStateException("No fake answer"))
     }

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/room/MatrixRoomState.kt

@@ -21,6 +21,7 @@ import androidx.compose.runtime.State
 import androidx.compose.runtime.produceState
 import io.element.android.libraries.matrix.api.room.MatrixRoom
 import io.element.android.libraries.matrix.api.room.MessageEventType
+import io.element.android.libraries.matrix.api.room.powerlevels.canRedact
 import io.element.android.libraries.matrix.api.room.powerlevels.canSendMessage
 
 @Composable
@@ -30,3 +31,10 @@ fun MatrixRoom.canSendMessageAsState(type: MessageEventType, updateKey: Long): S
     }
 }
 
+@Composable
+fun MatrixRoom.canRedactAsState(updateKey: Long): State<Boolean> {
+    return produceState(initialValue = false, key1 = updateKey) {
+        value = canRedact().getOrElse { false }
+    }
+}
+