Room admins can change user roles (#2423)

Allow Admins to modify room member roles:

- Add a 'roles and permissions' option for each room.
- Allow promoting users to admins, adding or removing moderators, and demote yourself if you're and admin.

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SelectedUser.kt

@@ -51,6 +51,7 @@ import io.element.android.libraries.ui.strings.CommonStrings
 @Composable
 fun SelectedUser(
     matrixUser: MatrixUser,
+    canRemove: Boolean,
     onUserRemoved: (MatrixUser) -> Unit,
     modifier: Modifier = Modifier,
 ) {
@@ -70,24 +71,26 @@ fun SelectedUser(
                 style = MaterialTheme.typography.bodyLarge,
             )
         }
-        Surface(
-            color = MaterialTheme.colorScheme.primary,
-            modifier = Modifier
-                .clip(CircleShape)
-                .size(20.dp)
-                .align(Alignment.TopEnd)
-                .clickable(
-                    indication = rememberRipple(),
-                    interactionSource = remember { MutableInteractionSource() },
-                    onClick = { onUserRemoved(matrixUser) }
-                ),
-        ) {
-            Icon(
-                imageVector = CompoundIcons.Close(),
-                contentDescription = stringResource(id = CommonStrings.action_remove),
-                tint = MaterialTheme.colorScheme.onPrimary,
-                modifier = Modifier.padding(2.dp)
-            )
+        if (canRemove) {
+            Surface(
+                color = MaterialTheme.colorScheme.primary,
+                modifier = Modifier
+                    .clip(CircleShape)
+                    .size(20.dp)
+                    .align(Alignment.TopEnd)
+                    .clickable(
+                        indication = rememberRipple(),
+                        interactionSource = remember { MutableInteractionSource() },
+                        onClick = { onUserRemoved(matrixUser) }
+                    ),
+            ) {
+                Icon(
+                    imageVector = CompoundIcons.Close(),
+                    contentDescription = stringResource(id = CommonStrings.action_remove),
+                    tint = MaterialTheme.colorScheme.onPrimary,
+                    modifier = Modifier.padding(2.dp)
+                )
+            }
         }
     }
 }
@@ -97,6 +100,17 @@ fun SelectedUser(
 internal fun SelectedUserPreview() = ElementPreview {
     SelectedUser(
         aMatrixUser(),
+        canRemove = true,
+        onUserRemoved = {},
+    )
+}
+
+@PreviewsDayNight
+@Composable
+internal fun SelectedUserCannotRemovePreview() = ElementPreview {
+    SelectedUser(
+        aMatrixUser(),
+        canRemove = false,
         onUserRemoved = {},
     )
 }

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SelectedUsersRowList.kt

@@ -46,11 +46,12 @@ import kotlinx.collections.immutable.toImmutableList
 import kotlin.math.floor
 
 @Composable
-fun SelectedUsersList(
+fun SelectedUsersRowList(
     selectedUsers: ImmutableList<MatrixUser>,
     onUserRemoved: (MatrixUser) -> Unit,
     modifier: Modifier = Modifier,
     autoScroll: Boolean = false,
+    canDeselect: (MatrixUser) -> Boolean = { true },
     contentPadding: PaddingValues = PaddingValues(0.dp),
 ) {
     val lazyListState = rememberLazyListState()
@@ -105,11 +106,12 @@ fun SelectedUsersList(
             .fillMaxWidth(),
         contentPadding = contentPadding,
     ) {
-        itemsIndexed(selectedUsers.toList()) { index, matrixUser ->
+        itemsIndexed(selectedUsers.toList()) { index, selectedUser ->
             Layout(
                 content = {
                     SelectedUser(
-                        matrixUser = matrixUser,
+                        matrixUser = selectedUser,
+                        canRemove = canDeselect(selectedUser),
                         onUserRemoved = onUserRemoved,
                     )
                 },
@@ -133,7 +135,7 @@ fun SelectedUsersList(
 internal fun SelectedUsersListPreview() = ElementPreview {
     Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
         // Two users that will be visible with no scrolling
-        SelectedUsersList(
+        SelectedUsersRowList(
             selectedUsers = aMatrixUserList().take(2).toImmutableList(),
             onUserRemoved = {},
             modifier = Modifier
@@ -143,7 +145,7 @@ internal fun SelectedUsersListPreview() = ElementPreview {
 
         // Multiple users that don't fit, so will be spaced out per the measure policy
         for (i in 0..5) {
-            SelectedUsersList(
+            SelectedUsersRowList(
                 selectedUsers = aMatrixUserList().take(6).toImmutableList(),
                 onUserRemoved = {},
                 modifier = Modifier

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

@@ -18,9 +18,12 @@ package io.element.android.libraries.matrix.ui.room
 
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.State
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
 import androidx.compose.runtime.produceState
 import io.element.android.libraries.matrix.api.room.MatrixRoom
 import io.element.android.libraries.matrix.api.room.MessageEventType
+import io.element.android.libraries.matrix.api.room.RoomMember
 import io.element.android.libraries.matrix.api.room.powerlevels.canRedactOther
 import io.element.android.libraries.matrix.api.room.powerlevels.canRedactOwn
 import io.element.android.libraries.matrix.api.room.powerlevels.canSendMessage
@@ -45,3 +48,10 @@ fun MatrixRoom.canRedactOtherAsState(updateKey: Long): State<Boolean> {
         value = canRedactOther().getOrElse { false }
     }
 }
+
+@Composable
+fun MatrixRoom.isOwnUserAdmin(): Boolean {
+    val roomInfo by roomInfoFlow.collectAsState(initial = null)
+    val powerLevel = roomInfo?.userPowerLevels?.get(sessionId) ?: 0L
+    return RoomMember.Role.forPowerLevel(powerLevel) == RoomMember.Role.ADMIN
+}