Invite users to existing rooms (#441)

Invite users to existing rooms

Scope:

- Allow inviting from the room detail screen and the member list
- Invite option is only shown if the user has the correct power level
- Search flow the same as creating a new room, allowing multi-select
- Existing room members/invitees are disabled with a custom caption
- Sending is asynchronous, an error dialog will appear wherever the
  user is if necessary

Closes #245

appnav/build.gradle.kts

@@ -56,6 +56,7 @@ dependencies {
     implementation(projects.tests.uitests)
     implementation(libs.coil)
 
+    implementation(projects.services.apperror.impl)
     implementation(projects.services.appnavstate.api)
 
     testImplementation(libs.test.junit)

appnav/src/main/kotlin/io/element/android/appnav/root/RootPresenter.kt

@@ -17,24 +17,30 @@
 package io.element.android.appnav.root
 
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
 import io.element.android.features.rageshake.api.crash.CrashDetectionPresenter
 import io.element.android.features.rageshake.api.detection.RageshakeDetectionPresenter
 import io.element.android.libraries.architecture.Presenter
+import io.element.android.services.apperror.api.AppErrorStateService
 import javax.inject.Inject
 
 class RootPresenter @Inject constructor(
     private val crashDetectionPresenter: CrashDetectionPresenter,
     private val rageshakeDetectionPresenter: RageshakeDetectionPresenter,
+    private val appErrorStateService: AppErrorStateService,
 ) : Presenter<RootState> {
 
     @Composable
     override fun present(): RootState {
         val rageshakeDetectionState = rageshakeDetectionPresenter.present()
         val crashDetectionState = crashDetectionPresenter.present()
+        val appErrorState by appErrorStateService.appErrorStateFlow.collectAsState()
 
         return RootState(
             rageshakeDetectionState = rageshakeDetectionState,
             crashDetectionState = crashDetectionState,
+            errorState = appErrorState,
         )
     }
 }

appnav/src/main/kotlin/io/element/android/appnav/root/RootState.kt

@@ -19,9 +19,11 @@ package io.element.android.appnav.root
 import androidx.compose.runtime.Immutable
 import io.element.android.features.rageshake.api.crash.CrashDetectionState
 import io.element.android.features.rageshake.api.detection.RageshakeDetectionState
+import io.element.android.services.apperror.api.AppErrorState
 
 @Immutable
 data class RootState(
     val rageshakeDetectionState: RageshakeDetectionState,
     val crashDetectionState: CrashDetectionState,
+    val errorState: AppErrorState,
 )

appnav/src/main/kotlin/io/element/android/appnav/root/RootStateProvider.kt

@@ -19,6 +19,8 @@ package io.element.android.appnav.root
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.features.rageshake.api.crash.aCrashDetectionState
 import io.element.android.features.rageshake.api.detection.aRageshakeDetectionState
+import io.element.android.services.apperror.api.AppErrorState
+import io.element.android.services.apperror.api.aAppErrorState
 
 open class RootStateProvider : PreviewParameterProvider<RootState> {
     override val values: Sequence<RootState>
@@ -30,6 +32,9 @@ open class RootStateProvider : PreviewParameterProvider<RootState> {
             aRootState().copy(
                 rageshakeDetectionState = aRageshakeDetectionState().copy(showDialog = true),
                 crashDetectionState = aCrashDetectionState().copy(crashDetected = false),
+            ),
+            aRootState().copy(
+                errorState = aAppErrorState(),
             )
         )
 }
@@ -37,4 +42,5 @@ open class RootStateProvider : PreviewParameterProvider<RootState> {
 fun aRootState() = RootState(
     rageshakeDetectionState = aRageshakeDetectionState(),
     crashDetectionState = aCrashDetectionState(),
+    errorState = AppErrorState.NoError,
 )

appnav/src/main/kotlin/io/element/android/appnav/root/RootView.kt

@@ -31,6 +31,7 @@ import io.element.android.features.rageshake.api.detection.RageshakeDetectionVie
 import io.element.android.libraries.designsystem.preview.ElementPreviewDark
 import io.element.android.libraries.designsystem.preview.ElementPreviewLight
 import io.element.android.libraries.designsystem.theme.components.Text
+import io.element.android.services.apperror.impl.AppErrorView
 
 @Composable
 fun RootView(
@@ -60,6 +61,9 @@ fun RootView(
             state = state.crashDetectionState,
             onOpenBugReport = ::onOpenBugReport,
         )
+        AppErrorView(
+            state = state.errorState,
+        )
     }
 }
 

appnav/src/test/kotlin/io/element/android/appnav/RootPresenterTest.kt

@@ -28,6 +28,9 @@ import io.element.android.features.rageshake.test.crash.FakeCrashDataStore
 import io.element.android.features.rageshake.test.rageshake.FakeRageShake
 import io.element.android.features.rageshake.test.rageshake.FakeRageshakeDataStore
 import io.element.android.features.rageshake.test.screenshot.FakeScreenshotHolder
+import io.element.android.services.apperror.api.AppErrorState
+import io.element.android.services.apperror.api.AppErrorStateService
+import io.element.android.services.apperror.impl.DefaultAppErrorStateService
 import kotlinx.coroutines.test.runTest
 import org.junit.Test
 
@@ -44,7 +47,32 @@ class RootPresenterTest {
         }
     }
 
-    private fun createPresenter(): RootPresenter {
+    @Test
+    fun `present - passes app error state`() = runTest {
+        val presenter = createPresenter(
+            appErrorService = DefaultAppErrorStateService().apply {
+                showError("Bad news", "Something bad happened")
+            }
+        )
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            skipItems(1)
+
+            val initialState = awaitItem()
+            assertThat(initialState.errorState).isInstanceOf(AppErrorState.Error::class.java)
+            val initialErrorState = initialState.errorState as AppErrorState.Error
+            assertThat(initialErrorState.title).isEqualTo("Bad news")
+            assertThat(initialErrorState.body).isEqualTo("Something bad happened")
+
+            initialErrorState.dismiss()
+            assertThat(awaitItem().errorState).isInstanceOf(AppErrorState.NoError::class.java)
+        }
+    }
+
+    private fun createPresenter(
+        appErrorService: AppErrorStateService = DefaultAppErrorStateService()
+    ): RootPresenter {
         val crashDataStore = FakeCrashDataStore()
         val rageshakeDataStore = FakeRageshakeDataStore()
         val rageshake = FakeRageShake()
@@ -63,6 +91,7 @@ class RootPresenterTest {
         return RootPresenter(
             crashDetectionPresenter = crashDetectionPresenter,
             rageshakeDetectionPresenter = rageshakeDetectionPresenter,
+            appErrorStateService = appErrorService,
         )
     }
 }

changelog.d/245.feature

@@ -0,0 +1 @@
+[Create and join rooms] Add ability to invite users to existing rooms

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/addpeople/AddPeopleView.kt

@@ -33,6 +33,7 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import io.element.android.features.createroom.impl.R
 import io.element.android.features.createroom.impl.components.UserListView
+import io.element.android.features.createroom.impl.userlist.UserListEvents
 import io.element.android.features.createroom.impl.userlist.UserListState
 import io.element.android.libraries.designsystem.components.button.BackButton
 import io.element.android.libraries.designsystem.preview.ElementPreviewDark
@@ -54,13 +55,17 @@ fun AddPeopleView(
     Scaffold(
         modifier = modifier,
         topBar = {
-            if (!state.isSearchActive) {
-                AddPeopleViewTopBar(
-                    hasSelectedUsers = state.selectedUsers.isNotEmpty(),
-                    onBackPressed = onBackPressed,
-                    onNextPressed = onNextPressed,
-                )
-            }
+            AddPeopleViewTopBar(
+                hasSelectedUsers = state.selectedUsers.isNotEmpty(),
+                onBackPressed = {
+                    if (state.isSearchActive) {
+                        state.eventSink(UserListEvents.OnSearchActiveChanged(false))
+                    } else {
+                        onBackPressed()
+                    }
+                },
+                onNextPressed = onNextPressed,
+            )
         }
     ) { padding ->
         Column(
@@ -73,6 +78,7 @@ fun AddPeopleView(
                 modifier = Modifier
                     .fillMaxWidth(),
                 state = state,
+                showBackButton = false,
             )
         }
     }

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/components/SearchUserBar.kt

@@ -39,6 +39,7 @@ fun SearchUserBar(
     active: Boolean,
     isMultiSelectionEnabled: Boolean,
     modifier: Modifier = Modifier,
+    showBackButton: Boolean = true,
     placeHolderTitle: String = stringResource(R.string.common_search_for_someone),
     onActiveChanged: (Boolean) -> Unit = {},
     onTextChanged: (String) -> Unit = {},
@@ -52,6 +53,7 @@ fun SearchUserBar(
         onActiveChange = onActiveChanged,
         modifier = modifier,
         placeHolderTitle = placeHolderTitle,
+        showBackButton = showBackButton,
         contentPrefix = {
             if (isMultiSelectionEnabled && active && selectedUsers.isNotEmpty()) {
                 SelectedUsersList(

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/components/UserListView.kt

@@ -36,6 +36,7 @@ import io.element.android.libraries.matrix.ui.components.SelectedUsersList
 fun UserListView(
     state: UserListState,
     modifier: Modifier = Modifier,
+    showBackButton: Boolean = true,
     onUserSelected: (MatrixUser) -> Unit = {},
     onUserDeselected: (MatrixUser) -> Unit = {},
 ) {
@@ -49,6 +50,7 @@ fun UserListView(
             selectedUsers = state.selectedUsers,
             active = state.isSearchActive,
             isMultiSelectionEnabled = state.isMultiSelectionEnabled,
+            showBackButton = showBackButton,
             onActiveChanged = { state.eventSink(UserListEvents.OnSearchActiveChanged(it)) },
             onTextChanged = { state.eventSink(UserListEvents.UpdateSearchQuery(it)) },
             onUserSelected = {

features/roomdetails/impl/build.gradle.kts

@@ -43,6 +43,7 @@ dependencies {
     implementation(projects.libraries.androidutils)
     api(projects.features.roomdetails.api)
     api(projects.libraries.usersearch.api)
+    api(projects.services.apperror.api)
     implementation(libs.coil.compose)
 
     testImplementation(libs.test.junit)
@@ -51,6 +52,7 @@ dependencies {
     testImplementation(libs.test.truth)
     testImplementation(libs.test.turbine)
     testImplementation(projects.libraries.matrix.test)
+    testImplementation(projects.libraries.usersearch.test)
     testImplementation(projects.tests.testutils)
 
     ksp(libs.showkase.processor)

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/RoomDetailsFlowNode.kt

@@ -28,6 +28,7 @@ import com.bumble.appyx.navmodel.backstack.operation.push
 import dagger.assisted.Assisted
 import dagger.assisted.AssistedInject
 import io.element.android.anvilannotations.ContributesNode
+import io.element.android.features.roomdetails.impl.invite.RoomInviteMembersNode
 import io.element.android.features.roomdetails.impl.members.RoomMemberListNode
 import io.element.android.features.roomdetails.impl.members.details.RoomMemberDetailsNode
 import io.element.android.libraries.architecture.BackstackNode
@@ -57,6 +58,9 @@ class RoomDetailsFlowNode @AssistedInject constructor(
         @Parcelize
         object RoomMemberList : NavTarget
 
+        @Parcelize
+        object InviteMembers : NavTarget
+
         @Parcelize
         data class RoomMemberDetails(val roomMemberId: UserId) : NavTarget
     }
@@ -68,6 +72,10 @@ class RoomDetailsFlowNode @AssistedInject constructor(
                     override fun openRoomMemberList() {
                         backstack.push(NavTarget.RoomMemberList)
                     }
+
+                    override fun openInviteMembers() {
+                        backstack.push(NavTarget.InviteMembers)
+                    }
                 }
                 createNode<RoomDetailsNode>(buildContext, listOf(roomDetailsCallback))
             }
@@ -76,9 +84,16 @@ class RoomDetailsFlowNode @AssistedInject constructor(
                     override fun openRoomMemberDetails(roomMemberId: UserId) {
                         backstack.push(NavTarget.RoomMemberDetails(roomMemberId))
                     }
+
+                    override fun openInviteMembers() {
+                        backstack.push(NavTarget.InviteMembers)
+                    }
                 }
                 createNode<RoomMemberListNode>(buildContext, listOf(roomMemberListCallback))
             }
+            NavTarget.InviteMembers -> {
+                createNode<RoomInviteMembersNode>(buildContext)
+            }
             is NavTarget.RoomMemberDetails -> {
                 createNode<RoomMemberDetailsNode>(buildContext, listOf(RoomMemberDetailsNode.Inputs(navTarget.roomMemberId)))
             }

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/RoomDetailsNode.kt

@@ -45,6 +45,7 @@ class RoomDetailsNode @AssistedInject constructor(
 
     interface Callback : Plugin {
         fun openRoomMemberList()
+        fun openInviteMembers()
     }
 
     private val callbacks = plugins<Callback>()
@@ -53,6 +54,10 @@ class RoomDetailsNode @AssistedInject constructor(
         callbacks.forEach { it.openRoomMemberList() }
     }
 
+    private fun invitePeople() {
+        callbacks.forEach { it.openInviteMembers() }
+    }
+
     private fun onShareRoom(context: Context) {
         val alias = room.alias ?: room.alternativeAliases.firstOrNull()
         val permalinkResult = alias?.let { PermalinkBuilder.permalinkForRoomAlias(it) }
@@ -105,6 +110,7 @@ class RoomDetailsNode @AssistedInject constructor(
             onShareRoom = ::onShareRoom,
             onShareMember = ::onShareMember,
             openRoomMemberList = ::openRoomMemberList,
+            invitePeople = ::invitePeople,
         )
     }
 }

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/RoomDetailsPresenter.kt

@@ -62,6 +62,7 @@ class RoomDetailsPresenter @Inject constructor(
 
         val membersState by room.membersStateFlow.collectAsState()
         val memberCount by getMemberCount(membersState)
+        val canInvite by getCanInvite(membersState)
         val dmMember by room.getDirectRoomMember(membersState)
         val roomMemberDetailsPresenter = roomMemberDetailsPresenter(dmMember)
         val roomType = getRoomType(dmMember)
@@ -76,7 +77,7 @@ class RoomDetailsPresenter @Inject constructor(
                         error = error,
                     )
                 }
-                is RoomDetailsEvent.ClearLeaveRoomWarning -> leaveRoomWarning.value = null
+                RoomDetailsEvent.ClearLeaveRoomWarning -> leaveRoomWarning.value = null
                 RoomDetailsEvent.ClearError -> error.value = null
             }
         }
@@ -91,6 +92,7 @@ class RoomDetailsPresenter @Inject constructor(
             roomTopic = room.topic,
             memberCount = memberCount,
             isEncrypted = room.isEncrypted,
+            canInvite = canInvite,
             displayLeaveRoomWarning = leaveRoomWarning.value,
             error = error.value,
             roomType = roomType.value,
@@ -117,6 +119,15 @@ class RoomDetailsPresenter @Inject constructor(
         }
     }
 
+    @Composable
+    private fun getCanInvite(membersState: MatrixRoomMembersState): State<Boolean> {
+        val canInvite = remember(membersState) { mutableStateOf(false) }
+        LaunchedEffect(membersState) {
+            canInvite.value = room.canInvite().getOrElse { false }
+        }
+        return canInvite
+    }
+
     @Composable
     private fun getMemberCount(membersState: MatrixRoomMembersState): State<Async<Int>> {
         return remember(membersState) {

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/RoomDetailsState.kt

@@ -32,6 +32,7 @@ data class RoomDetailsState(
     val error: RoomDetailsError?,
     val roomType: RoomDetailsType,
     val roomMemberDetailsState: RoomMemberDetailsState?,
+    val canInvite: Boolean,
     val eventSink: (RoomDetailsEvent) -> Unit
 )
 

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/RoomDetailsStateProvider.kt

@@ -33,6 +33,7 @@ open class RoomDetailsStateProvider : PreviewParameterProvider<RoomDetailsState>
             aRoomDetailsState().copy(memberCount = Async.Failure(Throwable())),
             aDmRoomDetailsState().copy(roomName = "Daniel"),
             aDmRoomDetailsState(isDmMemberIgnored = true).copy(roomName = "Daniel"),
+            aRoomDetailsState().copy(canInvite = true),
             // Add other state here
         )
 }
@@ -71,6 +72,7 @@ fun aRoomDetailsState() = RoomDetailsState(
     isEncrypted = true,
     displayLeaveRoomWarning = null,
     error = null,
+    canInvite = false,
     roomType = RoomDetailsType.Room,
     roomMemberDetailsState = null,
     eventSink = {}

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/RoomDetailsView.kt

@@ -78,6 +78,7 @@ fun RoomDetailsView(
     onShareRoom: () -> Unit,
     onShareMember: (RoomMember) -> Unit,
     openRoomMemberList: () -> Unit,
+    invitePeople: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
 
@@ -127,7 +128,9 @@ fun RoomDetailsView(
                 MembersSection(
                     memberCount = memberCount,
                     isLoading = state.memberCount.isLoading(),
-                    openRoomMemberList = openRoomMemberList
+                    showInvite = state.canInvite,
+                    openRoomMemberList = openRoomMemberList,
+                    invitePeople = invitePeople,
                 )
             }
 
@@ -211,8 +214,10 @@ internal fun TopicSection(roomTopic: String, modifier: Modifier = Modifier) {
 internal fun MembersSection(
     memberCount: Int?,
     isLoading: Boolean,
+    showInvite: Boolean,
+    invitePeople: () -> Unit,
+    openRoomMemberList: () -> Unit,
     modifier: Modifier = Modifier,
-    openRoomMemberList: () -> Unit
 ) {
     PreferenceCategory(modifier = modifier) {
         PreferenceText(
@@ -222,10 +227,13 @@ internal fun MembersSection(
             onClick = openRoomMemberList,
             loadingCurrentValue = isLoading,
         )
-        PreferenceText(
-            title = stringResource(R.string.screen_room_details_invite_people_title),
-            icon = Icons.Outlined.PersonAddAlt,
-        )
+        if (showInvite) {
+            PreferenceText(
+                title = stringResource(R.string.screen_room_details_invite_people_title),
+                icon = Icons.Outlined.PersonAddAlt,
+                onClick = invitePeople,
+            )
+        }
     }
 }
 
@@ -291,5 +299,6 @@ private fun ContentToPreview(state: RoomDetailsState) {
         onShareRoom = {},
         onShareMember = {},
         openRoomMemberList = {},
+        invitePeople = {},
     )
 }

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/invite/RoomInviteMembersEvents.kt

@@ -0,0 +1,25 @@
+/*
+ * 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.features.roomdetails.impl.invite
+
+import io.element.android.libraries.matrix.api.user.MatrixUser
+
+sealed interface RoomInviteMembersEvents {
+    data class ToggleUser(val user: MatrixUser) : RoomInviteMembersEvents
+    data class UpdateSearchQuery(val query: String) : RoomInviteMembersEvents
+    data class OnSearchActiveChanged(val active: Boolean) : RoomInviteMembersEvents
+}

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/invite/RoomInviteMembersNode.kt

@@ -0,0 +1,78 @@
+/*
+ * 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.features.roomdetails.impl.invite
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import com.bumble.appyx.core.modality.BuildContext
+import com.bumble.appyx.core.node.Node
+import com.bumble.appyx.core.plugin.Plugin
+import dagger.assisted.Assisted
+import dagger.assisted.AssistedInject
+import io.element.android.anvilannotations.ContributesNode
+import io.element.android.libraries.core.coroutine.CoroutineDispatchers
+import io.element.android.libraries.di.RoomScope
+import io.element.android.libraries.matrix.api.room.MatrixRoom
+import io.element.android.services.apperror.api.AppErrorStateService
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.launch
+import io.element.android.libraries.ui.strings.R as StringR
+
+@ContributesNode(RoomScope::class)
+class RoomInviteMembersNode @AssistedInject constructor(
+    @Assisted buildContext: BuildContext,
+    @Assisted plugins: List<Plugin>,
+    coroutineDispatchers: CoroutineDispatchers,
+    private val room: MatrixRoom,
+    private val presenter: RoomInviteMembersPresenter,
+    private val appErrorStateService: AppErrorStateService,
+) : Node(buildContext, plugins = plugins) {
+
+    private val coroutineScope = CoroutineScope(SupervisorJob() + coroutineDispatchers.io)
+
+    @Composable
+    override fun View(modifier: Modifier) {
+        val state = presenter.present()
+        val context = LocalContext.current.applicationContext
+
+        RoomInviteMembersView(
+            state = state,
+            modifier = modifier,
+            onBackPressed = { navigateUp() },
+            onSendPressed = { users ->
+                navigateUp()
+
+                coroutineScope.launch {
+                    val anyInviteFailed = users
+                        .map { room.inviteUserById(it.userId) }
+                        .any { it.isFailure }
+
+                    if (anyInviteFailed) {
+                        appErrorStateService.showError(
+                            title = context.getString(StringR.string.common_unable_to_invite_title),
+                            body = context.getString(StringR.string.common_unable_to_invite_message),
+                        )
+                    }
+
+                    room.updateMembers()
+                }
+            }
+        )
+    }
+}

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/invite/RoomInviteMembersPresenter.kt

@@ -0,0 +1,152 @@
+/*
+ * 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.features.roomdetails.impl.invite
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.MutableState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import io.element.android.features.roomdetails.impl.members.RoomMemberListDataSource
+import io.element.android.libraries.architecture.Async
+import io.element.android.libraries.architecture.Presenter
+import io.element.android.libraries.architecture.execute
+import io.element.android.libraries.core.coroutine.CoroutineDispatchers
+import io.element.android.libraries.designsystem.theme.components.SearchBarResultState
+import io.element.android.libraries.matrix.api.room.RoomMember
+import io.element.android.libraries.matrix.api.room.RoomMembershipState
+import io.element.android.libraries.matrix.api.user.MatrixUser
+import io.element.android.libraries.usersearch.api.UserRepository
+import kotlinx.collections.immutable.ImmutableList
+import kotlinx.collections.immutable.persistentListOf
+import kotlinx.collections.immutable.toImmutableList
+import kotlinx.coroutines.withContext
+import javax.inject.Inject
+
+class RoomInviteMembersPresenter @Inject constructor(
+    private val userRepository: UserRepository,
+    private val roomMemberListDataSource: RoomMemberListDataSource,
+    private val coroutineDispatchers: CoroutineDispatchers,
+) : Presenter<RoomInviteMembersState> {
+
+    @Composable
+    override fun present(): RoomInviteMembersState {
+        val roomMembers = remember { mutableStateOf<Async<ImmutableList<RoomMember>>>(Async.Loading()) }
+        val selectedUsers = remember { mutableStateOf<ImmutableList<MatrixUser>>(persistentListOf()) }
+        val searchResults = remember { mutableStateOf<SearchBarResultState<ImmutableList<InvitableUser>>>(SearchBarResultState.NotSearching()) }
+        var searchQuery by rememberSaveable { mutableStateOf("") }
+        var searchActive by rememberSaveable { mutableStateOf(false) }
+
+        LaunchedEffect(Unit) {
+            fetchMembers(roomMembers)
+        }
+
+        LaunchedEffect(searchQuery, roomMembers) {
+            performSearch(searchResults, roomMembers, selectedUsers, searchQuery)
+        }
+
+        return RoomInviteMembersState(
+            canInvite = selectedUsers.value.isNotEmpty(),
+            selectedUsers = selectedUsers.value,
+            searchQuery = searchQuery,
+            isSearchActive = searchActive,
+            searchResults = searchResults.value,
+            eventSink = {
+                when (it) {
+                    is RoomInviteMembersEvents.OnSearchActiveChanged -> {
+                        searchActive = it.active
+                        searchQuery = ""
+                    }
+
+                    is RoomInviteMembersEvents.UpdateSearchQuery -> {
+                        searchQuery = it.query
+                    }
+
+                    is RoomInviteMembersEvents.ToggleUser -> {
+                        selectedUsers.toggleUser(it.user)
+                        searchResults.toggleUser(it.user)
+                    }
+                }
+            }
+        )
+    }
+
+    @JvmName("toggleUserInSelectedUsers")
+    private fun MutableState<ImmutableList<MatrixUser>>.toggleUser(user: MatrixUser) {
+        value = if (value.contains(user)) {
+            value.filterNot { it == user }
+        } else {
+            (value + user)
+        }.toImmutableList()
+    }
+
+    @JvmName("toggleUserInSearchResults")
+    private fun MutableState<SearchBarResultState<ImmutableList<InvitableUser>>>.toggleUser(user: MatrixUser) {
+        val existingResults = value
+        if (existingResults is SearchBarResultState.Results) {
+            value = SearchBarResultState.Results(
+                existingResults.results.map { iu ->
+                    if (iu.matrixUser == user) {
+                        iu.copy(isSelected = !iu.isSelected)
+                    } else {
+                        iu
+                    }
+                }.toImmutableList()
+            )
+        }
+    }
+
+    private suspend fun performSearch(
+        searchResults: MutableState<SearchBarResultState<ImmutableList<InvitableUser>>>,
+        roomMembers: MutableState<Async<ImmutableList<RoomMember>>>,
+        selectedUsers: MutableState<ImmutableList<MatrixUser>>,
+        searchQuery: String,
+    ) = withContext(coroutineDispatchers.io) {
+        searchResults.value = SearchBarResultState.NotSearching()
+
+        val joinedMembers = roomMembers.value.dataOrNull().orEmpty()
+
+        userRepository.search(searchQuery).collect {
+            searchResults.value = when {
+                it.isEmpty() -> SearchBarResultState.NoResults()
+                else -> SearchBarResultState.Results(it.map { user ->
+                    val existingMembership = joinedMembers.firstOrNull { j -> j.userId == user.userId }?.membership
+                    val isJoined = existingMembership == RoomMembershipState.JOIN
+                    val isInvited = existingMembership == RoomMembershipState.INVITE
+                    InvitableUser(
+                        matrixUser = user,
+                        isSelected = selectedUsers.value.contains(user) || isJoined || isInvited,
+                        isAlreadyJoined = isJoined,
+                        isAlreadyInvited = isInvited,
+                    )
+                }.toImmutableList())
+            }
+        }
+    }
+
+    private suspend fun fetchMembers(roomMembers: MutableState<Async<ImmutableList<RoomMember>>>) {
+        suspend {
+            withContext(coroutineDispatchers.io) {
+                roomMemberListDataSource.search("").toImmutableList()
+            }
+        }.execute(roomMembers)
+    }
+}
+

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/invite/RoomInviteMembersState.kt

@@ -0,0 +1,38 @@
+/*
+ * 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.features.roomdetails.impl.invite
+
+import io.element.android.libraries.designsystem.theme.components.SearchBarResultState
+import io.element.android.libraries.matrix.api.user.MatrixUser
+import kotlinx.collections.immutable.ImmutableList
+import kotlinx.collections.immutable.persistentListOf
+
+data class RoomInviteMembersState(
+    val canInvite: Boolean = false,
+    val searchQuery: String = "",
+    val searchResults: SearchBarResultState<ImmutableList<InvitableUser>> = SearchBarResultState.NotSearching(),
+    val selectedUsers: ImmutableList<MatrixUser> = persistentListOf(),
+    val isSearchActive: Boolean = false,
+    val eventSink: (RoomInviteMembersEvents) -> Unit = {},
+)
+
+data class InvitableUser(
+    val matrixUser: MatrixUser,
+    val isSelected: Boolean = false,
+    val isAlreadyJoined: Boolean = false,
+    val isAlreadyInvited: Boolean = false,
+)

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/invite/RoomInviteMembersStateProvider.kt

@@ -0,0 +1,52 @@
+/*
+ * 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.features.roomdetails.impl.invite
+
+import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import io.element.android.libraries.designsystem.theme.components.SearchBarResultState
+import io.element.android.libraries.matrix.ui.components.aMatrixUser
+import io.element.android.libraries.matrix.ui.components.aMatrixUserList
+import kotlinx.collections.immutable.persistentListOf
+import kotlinx.collections.immutable.toImmutableList
+
+internal class RoomInviteMembersStateProvider : PreviewParameterProvider<RoomInviteMembersState> {
+    override val values: Sequence<RoomInviteMembersState>
+        get() = sequenceOf(
+            RoomInviteMembersState(),
+            RoomInviteMembersState(canInvite = true, selectedUsers = aMatrixUserList().toImmutableList()),
+            RoomInviteMembersState(isSearchActive = true, searchQuery = "some query"),
+            RoomInviteMembersState(isSearchActive = true, searchQuery = "some query", selectedUsers = aMatrixUserList().toImmutableList()),
+            RoomInviteMembersState(isSearchActive = true, searchQuery = "some query", searchResults = SearchBarResultState.NoResults()),
+            RoomInviteMembersState(
+                isSearchActive = true,
+                canInvite = true,
+                searchQuery = "some query",
+                selectedUsers = persistentListOf(
+                    aMatrixUser("@carol:server.org", "Carol")
+                ),
+                searchResults = SearchBarResultState.Results(
+                    persistentListOf(
+                        InvitableUser(aMatrixUser("@alice:server.org")),
+                        InvitableUser(aMatrixUser("@bob:server.org", "Bob")),
+                        InvitableUser(aMatrixUser("@carol:server.org", "Carol"), isSelected = true),
+                        InvitableUser(aMatrixUser("@eve:server.org", "Eve"), isSelected = true, isAlreadyJoined = true),
+                        InvitableUser(aMatrixUser("@justin:server.org", "Justin"), isSelected = true, isAlreadyInvited = true),
+                    )
+                )
+            ),
+        )
+}

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/invite/RoomInviteMembersView.kt

@@ -0,0 +1,218 @@
+/*
+ * 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.features.roomdetails.impl.invite
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.consumeWindowInsets
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.tooling.preview.PreviewParameter
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import io.element.android.features.roomdetails.impl.R
+import io.element.android.libraries.designsystem.components.avatar.AvatarSize
+import io.element.android.libraries.designsystem.components.button.BackButton
+import io.element.android.libraries.designsystem.preview.ElementPreviewDark
+import io.element.android.libraries.designsystem.preview.ElementPreviewLight
+import io.element.android.libraries.designsystem.theme.components.CenterAlignedTopAppBar
+import io.element.android.libraries.designsystem.theme.components.Scaffold
+import io.element.android.libraries.designsystem.theme.components.SearchBar
+import io.element.android.libraries.designsystem.theme.components.SearchBarResultState
+import io.element.android.libraries.designsystem.theme.components.Text
+import io.element.android.libraries.designsystem.theme.components.TextButton
+import io.element.android.libraries.matrix.api.user.MatrixUser
+import io.element.android.libraries.matrix.ui.components.CheckableUserRow
+import io.element.android.libraries.matrix.ui.components.SelectedUsersList
+import io.element.android.libraries.matrix.ui.model.getAvatarData
+import io.element.android.libraries.matrix.ui.model.getBestName
+import kotlinx.collections.immutable.ImmutableList
+import io.element.android.libraries.ui.strings.R as StringR
+
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+fun RoomInviteMembersView(
+    state: RoomInviteMembersState,
+    modifier: Modifier = Modifier,
+    onBackPressed: () -> Unit = {},
+    onSendPressed: (List<MatrixUser>) -> Unit = {},
+) {
+    Scaffold(
+        topBar = {
+            RoomInviteMembersTopBar(
+                onBackPressed = {
+                    if (state.isSearchActive) {
+                        state.eventSink(RoomInviteMembersEvents.OnSearchActiveChanged(false))
+                    } else {
+                        onBackPressed()
+                    }
+                },
+                onSendPressed = { onSendPressed(state.selectedUsers) },
+                canSend = state.canInvite,
+            )
+        }
+    ) { padding ->
+        Column(
+            modifier = modifier
+                .fillMaxWidth()
+                .padding(padding)
+                .consumeWindowInsets(padding),
+            verticalArrangement = Arrangement.spacedBy(16.dp),
+        ) {
+            RoomInviteMembersSearchBar(
+                modifier = Modifier.fillMaxWidth(),
+                query = state.searchQuery,
+                selectedUsers = state.selectedUsers,
+                state = state.searchResults,
+                active = state.isSearchActive,
+                onActiveChanged = { state.eventSink(RoomInviteMembersEvents.OnSearchActiveChanged(it)) },
+                onTextChanged = { state.eventSink(RoomInviteMembersEvents.UpdateSearchQuery(it)) },
+                onUserToggled = { state.eventSink(RoomInviteMembersEvents.ToggleUser(it)) },
+            )
+
+            if (!state.isSearchActive) {
+                SelectedUsersList(
+                    modifier = Modifier.fillMaxWidth(),
+                    selectedUsers = state.selectedUsers,
+                    autoScroll = true,
+                    onUserRemoved = { state.eventSink(RoomInviteMembersEvents.ToggleUser(it)) },
+                    contentPadding = PaddingValues(16.dp),
+                )
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun RoomInviteMembersTopBar(
+    canSend: Boolean,
+    modifier: Modifier = Modifier,
+    onBackPressed: () -> Unit = {},
+    onSendPressed: () -> Unit = {},
+) {
+    CenterAlignedTopAppBar(
+        modifier = modifier,
+        title = {
+            Text(
+                text = stringResource(R.string.screen_room_details_invite_people_title),
+                fontSize = 16.sp,
+                fontWeight = FontWeight.SemiBold,
+            )
+        },
+        navigationIcon = { BackButton(onClick = onBackPressed) },
+        actions = {
+            TextButton(
+                onClick = onSendPressed,
+                content = {
+                    Text(stringResource(StringR.string.action_send))
+                },
+                enabled = canSend,
+            )
+        }
+    )
+}
+
+@Composable
+private fun RoomInviteMembersSearchBar(
+    query: String,
+    state: SearchBarResultState<ImmutableList<InvitableUser>>,
+    selectedUsers: ImmutableList<MatrixUser>,
+    active: Boolean,
+    modifier: Modifier = Modifier,
+    placeHolderTitle: String = stringResource(io.element.android.libraries.ui.strings.R.string.common_search_for_someone),
+    onActiveChanged: (Boolean) -> Unit = {},
+    onTextChanged: (String) -> Unit = {},
+    onUserToggled: (MatrixUser) -> Unit = {},
+) {
+    SearchBar(
+        query = query,
+        onQueryChange = onTextChanged,
+        active = active,
+        onActiveChange = onActiveChanged,
+        modifier = modifier,
+        placeHolderTitle = placeHolderTitle,
+        contentPrefix = {
+            if (selectedUsers.isNotEmpty()) {
+                SelectedUsersList(
+                    modifier = Modifier.fillMaxWidth(),
+                    selectedUsers = selectedUsers,
+                    autoScroll = true,
+                    onUserRemoved = onUserToggled,
+                    contentPadding = PaddingValues(16.dp),
+                )
+            }
+        },
+        showBackButton = false,
+        resultState = state,
+        resultHandler = { results ->
+            Text(
+                text = "Search results",
+                fontWeight = FontWeight.Medium,
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(start = 16.dp, top = 12.dp, end = 16.dp, bottom = 8.dp)
+            )
+
+            LazyColumn {
+                items(results) { invitableUser ->
+                    CheckableUserRow(
+                        checked = invitableUser.isSelected,
+                        enabled = !invitableUser.isAlreadyInvited && !invitableUser.isAlreadyJoined,
+                        avatarData = invitableUser.matrixUser.getAvatarData(AvatarSize.MEDIUM),
+                        name = invitableUser.matrixUser.getBestName(),
+                        subtext = when {
+                            // If they're already invited or joined we show that information
+                            invitableUser.isAlreadyJoined -> stringResource(R.string.screen_room_details_already_a_member)
+                            invitableUser.isAlreadyInvited -> stringResource(R.string.screen_room_details_already_invited)
+                            // Otherwise show the ID, unless that's already used for their name
+                            invitableUser.matrixUser.displayName.isNullOrEmpty().not() -> invitableUser.matrixUser.userId.value
+                            else -> null
+                        },
+                        onCheckedChange = { onUserToggled(invitableUser.matrixUser) },
+                        modifier = Modifier.fillMaxWidth()
+                    )
+                }
+            }
+        },
+    )
+}
+
+@Preview
+@Composable
+fun RoomInviteMembersLightPreview(@PreviewParameter(RoomInviteMembersStateProvider::class) state: RoomInviteMembersState) =
+    ElementPreviewLight { ContentToPreview(state) }
+
+@Preview
+@Composable
+fun RoomInviteMembersDarkPreview(@PreviewParameter(RoomInviteMembersStateProvider::class) state: RoomInviteMembersState) =
+    ElementPreviewDark { ContentToPreview(state) }
+
+@Composable
+private fun ContentToPreview(state: RoomInviteMembersState) {
+    RoomInviteMembersView(state)
+}

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/members/RoomMemberListNode.kt

@@ -27,7 +27,6 @@ import dagger.assisted.AssistedInject
 import io.element.android.anvilannotations.ContributesNode
 import io.element.android.libraries.di.RoomScope
 import io.element.android.libraries.matrix.api.core.UserId
-import io.element.android.libraries.matrix.api.room.RoomMember
 
 @ContributesNode(RoomScope::class)
 class RoomMemberListNode @AssistedInject constructor(
@@ -38,6 +37,7 @@ class RoomMemberListNode @AssistedInject constructor(
 
     interface Callback : Plugin {
         fun openRoomMemberDetails(roomMemberId: UserId)
+        fun openInviteMembers()
     }
 
     private val callbacks = plugins<Callback>()
@@ -48,6 +48,12 @@ class RoomMemberListNode @AssistedInject constructor(
         }
     }
 
+    private fun openInviteMembers() {
+        callbacks.forEach {
+            it.openInviteMembers()
+        }
+    }
+
     @Composable
     override fun View(modifier: Modifier) {
         val state = presenter.present()
@@ -56,6 +62,7 @@ class RoomMemberListNode @AssistedInject constructor(
             modifier = modifier,
             onBackPressed = { navigateUp() },
             onMemberSelected = this::openRoomMemberDetails,
+            onInvitePressed = this::openInviteMembers,
         )
     }
 }

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/members/RoomMemberListPresenter.kt

@@ -18,6 +18,8 @@ package io.element.android.features.roomdetails.impl.members
 
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.State
+import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -27,12 +29,15 @@ import io.element.android.libraries.architecture.Async
 import io.element.android.libraries.architecture.Presenter
 import io.element.android.libraries.core.coroutine.CoroutineDispatchers
 import io.element.android.libraries.designsystem.theme.components.SearchBarResultState
+import io.element.android.libraries.matrix.api.room.MatrixRoom
+import io.element.android.libraries.matrix.api.room.MatrixRoomMembersState
 import io.element.android.libraries.matrix.api.room.RoomMembershipState
 import kotlinx.collections.immutable.toImmutableList
 import kotlinx.coroutines.withContext
 import javax.inject.Inject
 
 class RoomMemberListPresenter @Inject constructor(
+    private val room: MatrixRoom,
     private val roomMemberListDataSource: RoomMemberListDataSource,
     private val coroutineDispatchers: CoroutineDispatchers,
 ) : Presenter<RoomMemberListState> {
@@ -46,6 +51,9 @@ class RoomMemberListPresenter @Inject constructor(
         }
         var isSearchActive by rememberSaveable { mutableStateOf(false) }
 
+        val membersState by room.membersStateFlow.collectAsState()
+        val canInvite by getCanInvite(membersState = membersState)
+
         LaunchedEffect(Unit) {
             withContext(coroutineDispatchers.io) {
                 val members = roomMemberListDataSource.search("").groupBy { it.membership }
@@ -80,6 +88,7 @@ class RoomMemberListPresenter @Inject constructor(
             searchQuery = searchQuery,
             searchResults = searchResults,
             isSearchActive = isSearchActive,
+            canInvite = canInvite,
             eventSink = { event ->
                 when (event) {
                     is RoomMemberListEvents.OnSearchActiveChanged -> isSearchActive = event.active
@@ -88,5 +97,14 @@ class RoomMemberListPresenter @Inject constructor(
             },
         )
     }
+
+    @Composable
+    private fun getCanInvite(membersState: MatrixRoomMembersState): State<Boolean> {
+        val canInvite = remember(membersState) { mutableStateOf(false) }
+        LaunchedEffect(membersState) {
+            canInvite.value = room.canInvite().getOrElse { false }
+        }
+        return canInvite
+    }
 }
 

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/members/RoomMemberListState.kt

@@ -26,6 +26,7 @@ data class RoomMemberListState(
     val searchQuery: String,
     val searchResults: SearchBarResultState<RoomMembers>,
     val isSearchActive: Boolean,
+    val canInvite: Boolean,
     val eventSink: (RoomMemberListEvents) -> Unit,
 )
 

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/members/RoomMemberListStateProvider.kt

@@ -36,6 +36,7 @@ internal class RoomMemberListStateProvider : PreviewParameterProvider<RoomMember
                 )
             ),
             aRoomMemberListState(roomMembers = Async.Loading()),
+            aRoomMemberListState().copy(canInvite = true),
             aRoomMemberListState().copy(isSearchActive = false),
             aRoomMemberListState().copy(isSearchActive = true),
             aRoomMemberListState().copy(isSearchActive = true, searchQuery = "someone"),
@@ -65,6 +66,7 @@ internal fun aRoomMemberListState(
     searchQuery = "",
     searchResults = searchResults,
     isSearchActive = false,
+    canInvite = false,
     eventSink = {}
 )
 

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/members/RoomMemberListView.kt

@@ -56,6 +56,7 @@ import io.element.android.libraries.designsystem.theme.components.Scaffold
 import io.element.android.libraries.designsystem.theme.components.SearchBar
 import io.element.android.libraries.designsystem.theme.components.SearchBarResultState
 import io.element.android.libraries.designsystem.theme.components.Text
+import io.element.android.libraries.designsystem.theme.components.TextButton
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.room.RoomMember
 import io.element.android.libraries.matrix.api.user.MatrixUser
@@ -68,6 +69,7 @@ import io.element.android.libraries.ui.strings.R as StringR
 fun RoomMemberListView(
     state: RoomMemberListState,
     onBackPressed: () -> Unit,
+    onInvitePressed: () -> Unit,
     onMemberSelected: (UserId) -> Unit,
     modifier: Modifier = Modifier,
 ) {
@@ -79,7 +81,11 @@ fun RoomMemberListView(
     Scaffold(
         topBar = {
             if (!state.isSearchActive) {
-                RoomMemberListTopBar(onBackPressed = onBackPressed)
+                RoomMemberListTopBar(
+                    canInvite = state.canInvite,
+                    onBackPressed = onBackPressed,
+                    onInvitePressed = onInvitePressed,
+                )
             }
         }
     ) { padding ->
@@ -192,8 +198,10 @@ private fun RoomMemberListItem(
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 private fun RoomMemberListTopBar(
+    canInvite: Boolean,
     modifier: Modifier = Modifier,
     onBackPressed: () -> Unit = {},
+    onInvitePressed: () -> Unit = {},
 ) {
     CenterAlignedTopAppBar(
         modifier = modifier,
@@ -205,6 +213,19 @@ private fun RoomMemberListTopBar(
             )
         },
         navigationIcon = { BackButton(onClick = onBackPressed) },
+        actions = {
+            if (canInvite) {
+                TextButton(
+                    modifier = Modifier.padding(horizontal = 8.dp),
+                    onClick = onInvitePressed,
+                ) {
+                    Text(
+                        text = stringResource(StringR.string.action_invite),
+                        fontSize = 16.sp,
+                    )
+                }
+            }
+        }
     )
 }
 
@@ -252,6 +273,7 @@ private fun ContentToPreview(state: RoomMemberListState) {
     RoomMemberListView(
         state = state,
         onBackPressed = {},
-        onMemberSelected = {}
+        onMemberSelected = {},
+        onInvitePressed = {},
     )
 }

features/roomdetails/impl/src/test/kotlin/io/element/android/features/roomdetails/RoomDetailsPresenterTests.kt

@@ -25,7 +25,6 @@ import io.element.android.features.roomdetails.impl.RoomDetailsEvent
 import io.element.android.features.roomdetails.impl.RoomDetailsPresenter
 import io.element.android.features.roomdetails.impl.RoomDetailsType
 import io.element.android.features.roomdetails.impl.members.aRoomMember
-import io.element.android.features.roomdetails.impl.members.aRoomMemberList
 import io.element.android.features.roomdetails.impl.members.details.RoomMemberDetailsPresenter
 import io.element.android.libraries.architecture.Async
 import io.element.android.libraries.matrix.api.core.RoomId
@@ -33,7 +32,6 @@ import io.element.android.libraries.matrix.api.core.SessionId
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.room.MatrixRoom
 import io.element.android.libraries.matrix.api.room.MatrixRoomMembersState
-import io.element.android.libraries.matrix.api.room.RoomMember
 import io.element.android.libraries.matrix.api.room.RoomMembershipObserver
 import io.element.android.libraries.matrix.api.room.RoomMembershipState
 import io.element.android.libraries.matrix.api.timeline.item.event.MembershipChange
@@ -101,18 +99,19 @@ class RoomDetailsPresenterTests {
             room.givenRoomMembersState(MatrixRoomMembersState.Unknown)
             val initialState = awaitItem()
             Truth.assertThat(initialState.memberCount).isEqualTo(Async.Uninitialized)
+            skipItems(1)
 
             room.givenRoomMembersState(MatrixRoomMembersState.Pending(null))
             val loadingState = awaitItem()
             Truth.assertThat(loadingState.memberCount).isEqualTo(Async.Loading(null))
 
             room.givenRoomMembersState(MatrixRoomMembersState.Error(error))
-            //skipItems(1)
+            skipItems(1)
             val failureState = awaitItem()
             Truth.assertThat(failureState.memberCount).isEqualTo(Async.Failure(error, null))
 
             room.givenRoomMembersState(MatrixRoomMembersState.Ready(roomMembers))
-            //skipItems(1)
+            skipItems(1)
             val successState = awaitItem()
             Truth.assertThat(successState.memberCount).isEqualTo(Async.Success(1))
 
@@ -166,6 +165,8 @@ class RoomDetailsPresenterTests {
             presenter.present()
         }.test {
             val initialState = awaitItem()
+            skipItems(1)
+
             initialState.eventSink(RoomDetailsEvent.LeaveRoom(needsConfirmation = true))
             val confirmationState = awaitItem()
             Truth.assertThat(confirmationState.displayLeaveRoomWarning).isEqualTo(LeaveRoomWarning.PrivateRoom)
@@ -182,6 +183,8 @@ class RoomDetailsPresenterTests {
             presenter.present()
         }.test {
             val initialState = awaitItem()
+            skipItems(1)
+
             initialState.eventSink(RoomDetailsEvent.LeaveRoom(needsConfirmation = true))
             val confirmationState = awaitItem()
             Truth.assertThat(confirmationState.displayLeaveRoomWarning).isEqualTo(LeaveRoomWarning.LastUserInRoom)
@@ -198,6 +201,8 @@ class RoomDetailsPresenterTests {
             presenter.present()
         }.test {
             val initialState = awaitItem()
+            skipItems(1)
+
             initialState.eventSink(RoomDetailsEvent.LeaveRoom(needsConfirmation = true))
             val confirmationState = awaitItem()
             Truth.assertThat(confirmationState.displayLeaveRoomWarning).isEqualTo(LeaveRoomWarning.Generic)
@@ -214,6 +219,8 @@ class RoomDetailsPresenterTests {
             presenter.present()
         }.test {
             val initialState = awaitItem()
+            skipItems(1)
+
             initialState.eventSink(RoomDetailsEvent.LeaveRoom(needsConfirmation = false))
 
             cancelAndIgnoreRemainingEvents()
@@ -235,6 +242,8 @@ class RoomDetailsPresenterTests {
             presenter.present()
         }.test {
             val initialState = awaitItem()
+            skipItems(1)
+
             initialState.eventSink(RoomDetailsEvent.LeaveRoom(needsConfirmation = false))
             val errorState = awaitItem()
             Truth.assertThat(errorState.error).isNotNull()
@@ -242,6 +251,50 @@ class RoomDetailsPresenterTests {
             Truth.assertThat(awaitItem().error).isNull()
         }
     }
+
+    @Test
+    fun `present - initial state when user can invite others to room`() = runTest {
+        val room = aMatrixRoom().apply {
+            givenCanInviteResult(Result.success(true))
+        }
+        val presenter = aRoomDetailsPresenter(room)
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            // Initially false
+            Truth.assertThat(awaitItem().canInvite).isFalse()
+            // Then the asynchronous check completes and it becomes true
+            Truth.assertThat(awaitItem().canInvite).isTrue()
+
+            cancelAndIgnoreRemainingEvents()
+        }
+    }
+
+    @Test
+    fun `present - initial state when user can not invite others to room`() = runTest {
+        val room = aMatrixRoom().apply {
+            givenCanInviteResult(Result.success(false))
+        }
+        val presenter = aRoomDetailsPresenter(room)
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            Truth.assertThat(awaitItem().canInvite).isFalse()
+        }
+    }
+
+    @Test
+    fun `present - initial state when canInvite errors`() = runTest {
+        val room = aMatrixRoom().apply {
+            givenCanInviteResult(Result.failure(Throwable("Whoops")))
+        }
+        val presenter = aRoomDetailsPresenter(room)
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            Truth.assertThat(awaitItem().canInvite).isFalse()
+        }
+    }
 }
 
 fun aMatrixClient(

features/roomdetails/impl/src/test/kotlin/io/element/android/features/roomdetails/impl/invite/RoomInviteMembersPresenterTest.kt

@@ -0,0 +1,331 @@
+/*
+ * 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.features.roomdetails.impl.invite
+
+import app.cash.molecule.RecompositionClock
+import app.cash.molecule.moleculeFlow
+import app.cash.turbine.test
+import com.google.common.truth.Truth.assertThat
+import io.element.android.features.roomdetails.aMatrixRoom
+import io.element.android.features.roomdetails.impl.members.RoomMemberListDataSource
+import io.element.android.features.roomdetails.impl.members.aRoomMember
+import io.element.android.features.roomdetails.impl.members.aRoomMemberList
+import io.element.android.libraries.core.coroutine.CoroutineDispatchers
+import io.element.android.libraries.designsystem.theme.components.SearchBarResultState
+import io.element.android.libraries.matrix.api.room.MatrixRoom
+import io.element.android.libraries.matrix.api.room.MatrixRoomMembersState
+import io.element.android.libraries.matrix.api.room.RoomMembershipState
+import io.element.android.libraries.matrix.test.A_USER_ID_2
+import io.element.android.libraries.matrix.test.room.FakeMatrixRoom
+import io.element.android.libraries.matrix.ui.components.aMatrixUser
+import io.element.android.libraries.matrix.ui.components.aMatrixUserList
+import io.element.android.libraries.usersearch.test.FakeUserRepository
+import io.element.android.tests.testutils.testCoroutineDispatchers
+import kotlinx.collections.immutable.ImmutableList
+import kotlinx.coroutines.test.runTest
+import org.junit.Test
+
+internal class RoomInviteMembersPresenterTest {
+
+    @Test
+    fun `present - initial state has no results and no search`() = runTest {
+        val presenter = RoomInviteMembersPresenter(
+            userRepository = FakeUserRepository(),
+            roomMemberListDataSource = createDataSource(FakeMatrixRoom()),
+            coroutineDispatchers = testCoroutineDispatchers()
+        )
+
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            val initialState = awaitItem()
+
+            assertThat(initialState.searchResults).isInstanceOf(SearchBarResultState.NotSearching::class.java)
+            assertThat(initialState.isSearchActive).isFalse()
+            assertThat(initialState.canInvite).isFalse()
+            assertThat(initialState.searchQuery).isEmpty()
+
+            skipItems(1)
+        }
+    }
+
+    @Test
+    fun `present - updates search active state`() = runTest {
+        val presenter = RoomInviteMembersPresenter(
+            userRepository = FakeUserRepository(),
+            roomMemberListDataSource = createDataSource(FakeMatrixRoom()),
+            coroutineDispatchers = testCoroutineDispatchers()
+        )
+
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            val initialState = awaitItem()
+            skipItems(1)
+
+            initialState.eventSink(RoomInviteMembersEvents.OnSearchActiveChanged(true))
+
+            val resultState = awaitItem()
+            assertThat(resultState.isSearchActive).isTrue()
+        }
+    }
+
+    @Test
+    fun `present - performs search and handles no results`() = runTest {
+        val repository = FakeUserRepository()
+        val presenter = RoomInviteMembersPresenter(
+            userRepository = repository,
+            roomMemberListDataSource = createDataSource(FakeMatrixRoom()),
+            coroutineDispatchers = testCoroutineDispatchers()
+        )
+
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            val initialState = awaitItem()
+            skipItems(1)
+
+            initialState.eventSink(RoomInviteMembersEvents.UpdateSearchQuery("some query"))
+            skipItems(1)
+
+            assertThat(repository.providedQuery).isEqualTo("some query")
+            repository.emitResult(emptyList())
+            skipItems(1)
+
+            val resultState = awaitItem()
+            assertThat(resultState.searchResults).isInstanceOf(SearchBarResultState.NoResults::class.java)
+        }
+    }
+
+    @Test
+    fun `present - performs search and handles user results`() = runTest {
+        val repository = FakeUserRepository()
+        val presenter = RoomInviteMembersPresenter(
+            userRepository = repository,
+            roomMemberListDataSource = createDataSource(FakeMatrixRoom()),
+            coroutineDispatchers = testCoroutineDispatchers()
+        )
+
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            val initialState = awaitItem()
+            skipItems(1)
+
+            initialState.eventSink(RoomInviteMembersEvents.UpdateSearchQuery("some query"))
+            skipItems(1)
+
+            assertThat(repository.providedQuery).isEqualTo("some query")
+            repository.emitResult(aMatrixUserList())
+            skipItems(1)
+
+            val resultState = awaitItem()
+            assertThat(resultState.searchResults).isInstanceOf(SearchBarResultState.Results::class.java)
+
+            val expectedUsers = aMatrixUserList()
+            val users = resultState.searchResults.users()
+            expectedUsers.forEachIndexed { index, matrixUser ->
+                assertThat(users[index].matrixUser).isEqualTo(matrixUser)
+                assertThat(users[index].isAlreadyInvited).isFalse()
+                assertThat(users[index].isAlreadyJoined).isFalse()
+                assertThat(users[index].isSelected).isFalse()
+            }
+        }
+    }
+
+    @Test
+    fun `present - performs search and handles membership state of existing users`() = runTest {
+        val userList = aMatrixUserList()
+        val joinedUser = userList[0]
+        val invitedUser = userList[1]
+
+        val repository = FakeUserRepository()
+        val presenter = RoomInviteMembersPresenter(
+            userRepository = repository,
+            roomMemberListDataSource = createDataSource(FakeMatrixRoom().apply {
+                givenRoomMembersState(MatrixRoomMembersState.Ready(listOf(
+                    aRoomMember(userId = joinedUser.userId, membership = RoomMembershipState.JOIN),
+                    aRoomMember(userId = invitedUser.userId, membership = RoomMembershipState.INVITE),
+                )))
+            }),
+            coroutineDispatchers = testCoroutineDispatchers()
+        )
+
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            val initialState = awaitItem()
+            skipItems(1)
+
+            initialState.eventSink(RoomInviteMembersEvents.UpdateSearchQuery("some query"))
+            skipItems(1)
+
+            assertThat(repository.providedQuery).isEqualTo("some query")
+            repository.emitResult(aMatrixUserList())
+            skipItems(1)
+
+            val resultState = awaitItem()
+            assertThat(resultState.searchResults).isInstanceOf(SearchBarResultState.Results::class.java)
+
+            val users = resultState.searchResults.users()
+
+            // The result that matches a user with JOINED membership is marked as such
+            val userWhoShouldBeJoined = users.find { it.matrixUser == joinedUser }
+            assertThat(userWhoShouldBeJoined).isNotNull()
+            assertThat(userWhoShouldBeJoined?.isAlreadyJoined).isTrue()
+            assertThat(userWhoShouldBeJoined?.isAlreadyInvited).isFalse()
+
+            // The result that matches a user with INVITED membership is marked as such
+            val userWhoShouldBeInvited = users.find { it.matrixUser == invitedUser }
+            assertThat(userWhoShouldBeInvited).isNotNull()
+            assertThat(userWhoShouldBeInvited?.isAlreadyJoined).isFalse()
+            assertThat(userWhoShouldBeInvited?.isAlreadyInvited).isTrue()
+
+            // All other users are neither joined nor invited
+            val otherUsers = users.minus(userWhoShouldBeInvited!!).minus(userWhoShouldBeJoined!!)
+            assertThat(otherUsers.none { it.isAlreadyInvited }).isTrue()
+            assertThat(otherUsers.none { it.isAlreadyJoined }).isTrue()
+        }
+    }
+
+    @Test
+    fun `present - toggle users updates selected user state`() = runTest {
+        val repository = FakeUserRepository()
+        val presenter = RoomInviteMembersPresenter(
+            userRepository = repository,
+            roomMemberListDataSource = createDataSource(),
+            coroutineDispatchers = testCoroutineDispatchers()
+        )
+
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            val initialState = awaitItem()
+            skipItems(1)
+
+            // When we toggle a user not in the list, they are added
+            initialState.eventSink(RoomInviteMembersEvents.ToggleUser(aMatrixUser()))
+            assertThat(awaitItem().selectedUsers).containsExactly(aMatrixUser())
+
+            // Toggling a different user also adds them
+            initialState.eventSink(RoomInviteMembersEvents.ToggleUser(aMatrixUser(id = A_USER_ID_2.value)))
+            assertThat(awaitItem().selectedUsers).containsExactly(aMatrixUser(), aMatrixUser(id = A_USER_ID_2.value))
+
+            // Toggling the first user removes them
+            initialState.eventSink(RoomInviteMembersEvents.ToggleUser(aMatrixUser()))
+            assertThat(awaitItem().selectedUsers).containsExactly(aMatrixUser(id = A_USER_ID_2.value))
+        }
+    }
+
+    @Test
+    fun `present - selected users appear as such in search results`() = runTest {
+        val repository = FakeUserRepository()
+        val presenter = RoomInviteMembersPresenter(
+            userRepository = repository,
+            roomMemberListDataSource = createDataSource(FakeMatrixRoom()),
+            coroutineDispatchers = testCoroutineDispatchers()
+        )
+
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            val initialState = awaitItem()
+            skipItems(1)
+
+            val selectedUser = aMatrixUser()
+
+            initialState.eventSink(RoomInviteMembersEvents.ToggleUser(selectedUser))
+
+            initialState.eventSink(RoomInviteMembersEvents.UpdateSearchQuery("some query"))
+            skipItems(1)
+
+            assertThat(repository.providedQuery).isEqualTo("some query")
+            repository.emitResult(aMatrixUserList() + selectedUser)
+            skipItems(2)
+
+            val resultState = awaitItem()
+            assertThat(resultState.searchResults).isInstanceOf(SearchBarResultState.Results::class.java)
+
+            val users = resultState.searchResults.users()
+
+            // The one user we have previously toggled is marked as selected
+            val shouldBeSelectedUser = users.find { it.matrixUser == selectedUser }
+            assertThat(shouldBeSelectedUser).isNotNull()
+            assertThat(shouldBeSelectedUser?.isSelected).isTrue()
+
+            // And no others are
+            val allOtherUsers = users.minus(shouldBeSelectedUser!!)
+            assertThat(allOtherUsers.none { it.isSelected }).isTrue()
+        }
+    }
+
+
+    @Test
+    fun `present - toggling a user updates existing search results`() = runTest {
+        val repository = FakeUserRepository()
+        val presenter = RoomInviteMembersPresenter(
+            userRepository = repository,
+            roomMemberListDataSource = createDataSource(FakeMatrixRoom()),
+            coroutineDispatchers = testCoroutineDispatchers()
+        )
+
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            val initialState = awaitItem()
+            skipItems(1)
+
+            val selectedUser = aMatrixUser()
+
+            // Given a query is made
+            initialState.eventSink(RoomInviteMembersEvents.UpdateSearchQuery("some query"))
+            skipItems(1)
+
+            assertThat(repository.providedQuery).isEqualTo("some query")
+            repository.emitResult(aMatrixUserList() + selectedUser)
+            skipItems(2)
+
+            // And then a user is toggled
+            initialState.eventSink(RoomInviteMembersEvents.ToggleUser(selectedUser))
+            skipItems(1)
+            val resultState = awaitItem()
+
+            // The results are updated...
+            assertThat(resultState.searchResults).isInstanceOf(SearchBarResultState.Results::class.java)
+            val users = resultState.searchResults.users()
+
+            // The one user we have now toggled is marked as selected
+            val shouldBeSelectedUser = users.find { it.matrixUser == selectedUser }
+            assertThat(shouldBeSelectedUser).isNotNull()
+            assertThat(shouldBeSelectedUser?.isSelected).isTrue()
+
+            // And no others are
+            val allOtherUsers = users.minus(shouldBeSelectedUser!!)
+            assertThat(allOtherUsers.none { it.isSelected }).isTrue()
+        }
+    }
+
+    private fun createDataSource(
+        matrixRoom: MatrixRoom = aMatrixRoom().apply {
+            givenRoomMembersState(MatrixRoomMembersState.Ready(aRoomMemberList()))
+        },
+        coroutineDispatchers: CoroutineDispatchers = testCoroutineDispatchers()
+    ) = RoomMemberListDataSource(matrixRoom, coroutineDispatchers)
+
+    private fun SearchBarResultState<ImmutableList<InvitableUser>>.users() =
+        (this as? SearchBarResultState.Results<ImmutableList<InvitableUser>>)?.results.orEmpty()
+}

features/roomdetails/impl/src/test/kotlin/io/element/android/features/roomdetails/members/RoomMemberListPresenterTests.kt

@@ -32,6 +32,7 @@ import io.element.android.libraries.core.coroutine.CoroutineDispatchers
 import io.element.android.libraries.designsystem.theme.components.SearchBarResultState
 import io.element.android.libraries.matrix.api.room.MatrixRoom
 import io.element.android.libraries.matrix.api.room.MatrixRoomMembersState
+import io.element.android.libraries.matrix.test.room.FakeMatrixRoom
 import io.element.android.tests.testutils.testCoroutineDispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.test.runTest
@@ -113,6 +114,54 @@ class RoomMemberListPresenterTests {
 
         }
     }
+
+    @Test
+    fun `present - asynchronously sets canInvite when user has correct power level`() = runTest {
+        val presenter = createPresenter(
+            matrixRoom = FakeMatrixRoom().apply {
+                givenCanInviteResult(Result.success(true))
+            }
+        )
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            skipItems(1)
+            val loadedState = awaitItem()
+            Truth.assertThat(loadedState.canInvite).isTrue()
+        }
+    }
+
+    @Test
+    fun `present - asynchronously sets canInvite when user does not have correct power level`() = runTest {
+        val presenter = createPresenter(
+            matrixRoom = FakeMatrixRoom().apply {
+                givenCanInviteResult(Result.success(false))
+            }
+        )
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            skipItems(1)
+            val loadedState = awaitItem()
+            Truth.assertThat(loadedState.canInvite).isFalse()
+        }
+    }
+
+    @Test
+    fun `present - asynchronously sets canInvite when power level check fails`() = runTest {
+        val presenter = createPresenter(
+            matrixRoom = FakeMatrixRoom().apply {
+                givenCanInviteResult(Result.failure(Throwable("Eek")))
+            }
+        )
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            skipItems(1)
+            val loadedState = awaitItem()
+            Truth.assertThat(loadedState.canInvite).isFalse()
+        }
+    }
 }
 
 @ExperimentalCoroutinesApi
@@ -125,6 +174,7 @@ private fun createDataSource(
 
 @ExperimentalCoroutinesApi
 private fun createPresenter(
+    matrixRoom: MatrixRoom = FakeMatrixRoom(),
     roomMemberListDataSource: RoomMemberListDataSource = createDataSource(),
     coroutineDispatchers: CoroutineDispatchers = testCoroutineDispatchers()
-) = RoomMemberListPresenter(roomMemberListDataSource, coroutineDispatchers)
+) = RoomMemberListPresenter(matrixRoom, roomMemberListDataSource, coroutineDispatchers)

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/theme/components/SearchBar.kt

@@ -57,6 +57,7 @@ fun <T> SearchBar(
     placeHolderTitle: String,
     modifier: Modifier = Modifier,
     enabled: Boolean = true,
+    showBackButton: Boolean = true,
     resultState: SearchBarResultState<T> = SearchBarResultState.NotSearching(),
     shape: Shape = SearchBarDefaults.inputFieldShape,
     tonalElevation: Dp = SearchBarDefaults.Elevation,
@@ -87,7 +88,7 @@ fun <T> SearchBar(
                 modifier = Modifier.alpha(0.4f), // FIXME align on Design system theme (removing alpha should be fine)
             )
         },
-        leadingIcon = if (active) {
+        leadingIcon = if (showBackButton && active) {
             { BackButton(onClick = { onActiveChange(false) }) }
         } else {
             null
@@ -179,6 +180,16 @@ internal fun SearchBarPreviewActiveWithQuery() = ElementThemedPreview {
     )
 }
 
+@Preview(group = PreviewGroup.Search)
+@Composable
+internal fun SearchBarPreviewActiveWithQueryNoBackButton() = ElementThemedPreview {
+    ContentToPreview(
+        query = "search term",
+        active = true,
+        showBackButton = false,
+    )
+}
+
 @Preview(group = PreviewGroup.Search)
 @Composable
 internal fun SearchBarPreviewActiveWithNoResults() = ElementThemedPreview {
@@ -212,6 +223,7 @@ internal fun SearchBarPreviewActiveWithContent() = ElementThemedPreview {
 private fun ContentToPreview(
     query: String = "",
     active: Boolean = false,
+    showBackButton: Boolean = true,
     resultState: SearchBarResultState<String> = SearchBarResultState.NotSearching(),
     contentPrefix: @Composable ColumnScope.() -> Unit = {},
     contentSuffix: @Composable ColumnScope.() -> Unit = {},
@@ -221,6 +233,7 @@ private fun ContentToPreview(
         query = query,
         active = active,
         resultState = resultState,
+        showBackButton = showBackButton,
         onQueryChange = {},
         onActiveChange = {},
         placeHolderTitle = "Search for things",

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

@@ -85,4 +85,8 @@ interface MatrixRoom : Closeable {
     suspend fun acceptInvitation(): Result<Unit>
 
     suspend fun rejectInvitation(): Result<Unit>
+
+    suspend fun inviteUserById(id: UserId): Result<Unit>
+
+    suspend fun canInvite(): Result<Boolean>
 }

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

@@ -40,6 +40,7 @@ import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.onStart
 import kotlinx.coroutines.withContext
 import org.matrix.rustcomponents.sdk.Room
+import org.matrix.rustcomponents.sdk.RoomMember
 import org.matrix.rustcomponents.sdk.SlidingSyncRoom
 import org.matrix.rustcomponents.sdk.UpdateSummary
 import org.matrix.rustcomponents.sdk.genTransactionId
@@ -209,6 +210,18 @@ class RustMatrixRoom(
         }
     }
 
+    override suspend fun inviteUserById(id: UserId): Result<Unit> = withContext(coroutineDispatchers.io) {
+        runCatching {
+            innerRoom.inviteUserById(id.value)
+        }
+    }
+
+    override suspend fun canInvite(): Result<Boolean> = withContext(coroutineDispatchers.io) {
+        runCatching {
+            innerRoom.member(sessionId.value).use(RoomMember::canInvite)
+        }
+    }
+
     override suspend fun sendImage(file: File, thumbnailFile: File, imageInfo: ImageInfo): Result<Unit> {
         return runCatching {
             innerRoom.sendImage(file.path, thumbnailFile.path, imageInfo.map())

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/timeline/RustMatrixTimeline.kt

@@ -152,6 +152,7 @@ class RustMatrixTimeline(
                     RequiredState(key = "m.room.canonical_alias", value = ""),
                     RequiredState(key = "m.room.topic", value = ""),
                     RequiredState(key = "m.room.join_rules", value = ""),
+                    RequiredState(key = "m.room.power_levels", value = ""),
                 ),
                 timelineLimit = null
             )

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

@@ -59,6 +59,8 @@ class FakeMatrixRoom(
     private var updateMembersResult: Result<Unit> = Result.success(Unit)
     private var acceptInviteResult = Result.success(Unit)
     private var rejectInviteResult = Result.success(Unit)
+    private var inviteUserResult = Result.success(Unit)
+    private var canInviteResult = Result.success(true)
     private var sendMediaResult = Result.success(Unit)
     var sendMediaCount = 0
         private set
@@ -69,6 +71,9 @@ class FakeMatrixRoom(
     var isInviteRejected: Boolean = false
         private set
 
+    var invitedUserId: UserId? = null
+        private set
+
     private var leaveRoomError: Throwable? = null
 
     override val membersStateFlow: MutableStateFlow<MatrixRoomMembersState> = MutableStateFlow(MatrixRoomMembersState.Unknown)
@@ -136,6 +141,15 @@ class FakeMatrixRoom(
         return rejectInviteResult
     }
 
+    override suspend fun inviteUserById(id: UserId): Result<Unit> {
+        invitedUserId = id
+        return inviteUserResult
+    }
+
+    override suspend fun canInvite(): Result<Boolean> {
+        return canInviteResult
+    }
+
     override suspend fun sendImage(file: File, thumbnailFile: File, imageInfo: ImageInfo): Result<Unit> = sendMediaResult.also { sendMediaCount++ }
 
     override suspend fun sendVideo(file: File, thumbnailFile: File, videoInfo: VideoInfo): Result<Unit> = sendMediaResult.also { sendMediaCount++ }
@@ -174,6 +188,14 @@ class FakeMatrixRoom(
         rejectInviteResult = result
     }
 
+    fun givenInviteUserResult(result: Result<Unit>) {
+        inviteUserResult = result
+    }
+
+    fun givenCanInviteResult(result: Result<Boolean>) {
+        canInviteResult = result
+    }
+
     fun givenIgnoreResult(result: Result<Unit>) {
         ignoreResult = result
     }

libraries/ui-strings/src/main/res/values/localazy.xml

@@ -69,6 +69,7 @@
   <string name="common_file">"File"</string>
   <string name="common_gif">"GIF"</string>
   <string name="common_image">"Image"</string>
+  <string name="common_leaving_room">"Leaving room"</string>
   <string name="common_link_copied_to_clipboard">"Link copied to clipboard"</string>
   <string name="common_loading">"Loading…"</string>
   <string name="common_message">"Message"</string>
@@ -98,6 +99,8 @@
   <string name="common_suggestions">"Suggestions"</string>
   <string name="common_topic">"Topic"</string>
   <string name="common_unable_to_decrypt">"Unable to decrypt"</string>
+  <string name="common_unable_to_invite_message">"We were unable to successfully send invites to one or more users."</string>
+  <string name="common_unable_to_invite_title">"Unable to send invite(s)"</string>
   <string name="common_unsupported_event">"Unsupported event"</string>
   <string name="common_username">"Username"</string>
   <string name="common_verification_cancelled">"Verification cancelled"</string>
@@ -162,4 +165,4 @@
   <string name="screen_analytics_settings_read_terms">"You can read all our terms %1$s."</string>
   <string name="screen_analytics_settings_read_terms_content_link">"here"</string>
   <string name="screen_report_content_block_user">"Block user"</string>
-</resources>
+</resources>

plugins/src/main/kotlin/extension/DependencyHandleScope.kt

@@ -95,6 +95,7 @@ fun DependencyHandlerScope.allLibrariesImpl() {
 
 fun DependencyHandlerScope.allServicesImpl() {
     implementation(project(":services:analytics:noop"))
+    implementation(project(":services:apperror:impl"))
     implementation(project(":services:appnavstate:impl"))
     implementation(project(":services:toolbox:impl"))
 }

services/apperror/api/build.gradle.kts

@@ -0,0 +1,27 @@
+/*
+ * 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.
+ */
+
+plugins {
+    id("io.element.android-library")
+}
+
+android {
+    namespace = "io.element.android.services.apperror.api"
+}
+
+dependencies {
+    implementation(libs.coroutines.core)
+}

services/apperror/api/src/main/kotlin/io/element/android/services/apperror/api/AppErrorState.kt

@@ -0,0 +1,29 @@
+/*
+ * 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.services.apperror.api
+
+sealed interface AppErrorState {
+
+    object NoError : AppErrorState
+
+    data class Error(
+        val title: String,
+        val body: String,
+        val dismiss: () -> Unit,
+    ) : AppErrorState
+
+}

services/apperror/api/src/main/kotlin/io/element/android/services/apperror/api/AppErrorStateProvider.kt

@@ -0,0 +1,23 @@
+/*
+ * 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.services.apperror.api
+
+fun aAppErrorState() = AppErrorState.Error(
+    title = "An error occurred",
+    body = "Something went wrong, and the details of that would go here.",
+    dismiss = {},
+)

services/apperror/api/src/main/kotlin/io/element/android/services/apperror/api/AppErrorStateService.kt

@@ -0,0 +1,27 @@
+/*
+ * 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.services.apperror.api
+
+import kotlinx.coroutines.flow.StateFlow
+
+interface AppErrorStateService {
+
+    val appErrorStateFlow: StateFlow<AppErrorState>
+
+    fun showError(title: String, body: String)
+
+}

services/apperror/impl/build.gradle.kts

@@ -0,0 +1,51 @@
+/*
+ * 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.
+ */
+
+plugins {
+    id("io.element.android-compose-library")
+    alias(libs.plugins.ksp)
+    alias(libs.plugins.anvil)
+}
+
+anvil {
+    generateDaggerFactories.set(true)
+}
+
+android {
+    namespace = "io.element.android.services.apperror.impl"
+}
+
+dependencies {
+    anvil(projects.anvilcodegen)
+    implementation(libs.dagger)
+    implementation(projects.libraries.core)
+    implementation(projects.libraries.di)
+    implementation(projects.libraries.designsystem)
+    implementation(projects.libraries.uiStrings)
+    implementation(projects.anvilannotations)
+
+    implementation(libs.coroutines.core)
+    implementation(libs.androidx.corektx)
+
+    api(projects.services.apperror.api)
+
+    testImplementation(libs.test.junit)
+    testImplementation(libs.coroutines.test)
+    testImplementation(libs.test.turbine)
+    testImplementation(libs.test.truth)
+
+    ksp(libs.showkase.processor)
+}

services/apperror/impl/src/main/kotlin/io/element/android/services/apperror/impl/AppErrorView.kt

@@ -0,0 +1,66 @@
+/*
+ * 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.services.apperror.impl
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.tooling.preview.Preview
+import io.element.android.libraries.designsystem.components.dialogs.ErrorDialog
+import io.element.android.libraries.designsystem.preview.ElementPreviewDark
+import io.element.android.libraries.designsystem.preview.ElementPreviewLight
+import io.element.android.services.apperror.api.AppErrorState
+import io.element.android.services.apperror.api.aAppErrorState
+
+@Composable
+fun AppErrorView(
+    state: AppErrorState,
+) {
+    if (state is AppErrorState.Error) {
+        AppErrorViewContent(
+            title = state.title,
+            body = state.body,
+            onDismiss = state.dismiss,
+        )
+    }
+}
+
+@Composable
+fun AppErrorViewContent(
+    title: String,
+    body: String,
+    onDismiss: () -> Unit = { },
+) {
+    ErrorDialog(
+        title = title,
+        content = body,
+        onDismiss = onDismiss,
+    )
+}
+
+@Preview
+@Composable
+internal fun AppErrorViewLightPreview() = ElementPreviewLight { ContentToPreview() }
+
+@Preview
+@Composable
+internal fun AppErrorViewDarkPreview() = ElementPreviewDark { ContentToPreview() }
+
+@Composable
+private fun ContentToPreview() {
+    AppErrorView(
+        state = aAppErrorState()
+    )
+}

services/apperror/impl/src/main/kotlin/io/element/android/services/apperror/impl/DefaultAppErrorStateService.kt

@@ -0,0 +1,44 @@
+/*
+ * 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.services.apperror.impl
+
+import com.squareup.anvil.annotations.ContributesBinding
+import io.element.android.libraries.di.AppScope
+import io.element.android.libraries.di.SingleIn
+import io.element.android.services.apperror.api.AppErrorState
+import io.element.android.services.apperror.api.AppErrorStateService
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import javax.inject.Inject
+
+@ContributesBinding(AppScope::class)
+@SingleIn(AppScope::class)
+class DefaultAppErrorStateService @Inject constructor() : AppErrorStateService {
+
+    private val currentAppErrorState = MutableStateFlow<AppErrorState>(AppErrorState.NoError)
+    override val appErrorStateFlow: StateFlow<AppErrorState> = currentAppErrorState
+
+    override fun showError(title: String, body: String) {
+        currentAppErrorState.value = AppErrorState.Error(
+            title = title,
+            body = body,
+            dismiss = {
+                currentAppErrorState.value = AppErrorState.NoError
+            },
+        )
+    }
+}

services/apperror/impl/src/test/kotlin/io/element/android/services/apperror/impl/DefaultAppErrorStateServiceTest.kt

@@ -0,0 +1,72 @@
+/*
+ * 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.services.apperror.impl
+
+import app.cash.turbine.test
+import com.google.common.truth.Truth.assertThat
+import io.element.android.services.apperror.api.AppErrorState
+import kotlinx.coroutines.test.runTest
+import org.junit.Test
+
+internal class DefaultAppErrorStateServiceTest {
+
+    @Test
+    fun `initial value is no error`() = runTest {
+        val service = DefaultAppErrorStateService()
+
+        service.appErrorStateFlow.test {
+            val state = awaitItem()
+            assertThat(state).isInstanceOf(AppErrorState.NoError::class.java)
+        }
+    }
+
+    @Test
+    fun `showError - emits value`() = runTest {
+        val service = DefaultAppErrorStateService()
+
+        service.appErrorStateFlow.test {
+            skipItems(1)
+
+            service.showError("Title", "Body")
+            val state = awaitItem()
+            assertThat(state).isInstanceOf(AppErrorState.Error::class.java)
+
+            val errorState = state as AppErrorState.Error
+            assertThat(errorState.title).isEqualTo("Title")
+            assertThat(errorState.body).isEqualTo("Body")
+        }
+    }
+
+    @Test
+    fun `dismiss - clears value`() = runTest {
+        val service = DefaultAppErrorStateService()
+
+        service.appErrorStateFlow.test {
+            skipItems(1)
+
+            service.showError("Title", "Body")
+            val state = awaitItem()
+            assertThat(state).isInstanceOf(AppErrorState.Error::class.java)
+
+            val errorState = state as AppErrorState.Error
+            errorState.dismiss()
+
+            assertThat(awaitItem()).isInstanceOf(AppErrorState.NoError::class.java)
+        }
+    }
+
+}

tests/uitests/src/test/snapshots/images/io.element.android.tests.uitests_ScreenshotTest_preview_tests[io.element.android.features.createroom.impl.addpeople_null_DefaultGroup_AddPeopleViewDarkPreview_0_null_2,NEXUS_5,1.0,en].png

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