Warn on verify when private keys not known

vector/src/main/java/im/vector/riotx/features/roommemberprofile/RoomMemberProfileAction.kt

@@ -23,5 +23,5 @@ sealed class RoomMemberProfileAction : VectorViewModelAction {
 
     object RetryFetchingInfo: RoomMemberProfileAction()
     object IgnoreUser: RoomMemberProfileAction()
-    data class VerifyUser(val userId: String? = null, val roomId: String? = null): RoomMemberProfileAction()
+    data class VerifyUser(val userId: String? = null, val roomId: String? = null, val canCrossSign: Boolean? = true): RoomMemberProfileAction()
 }

vector/src/main/java/im/vector/riotx/features/roommemberprofile/RoomMemberProfileFragment.kt

@@ -20,6 +20,7 @@ package im.vector.riotx.features.roommemberprofile
 import android.os.Bundle
 import android.os.Parcelable
 import android.view.View
+import androidx.appcompat.app.AlertDialog
 import androidx.core.view.isVisible
 import com.airbnb.mvrx.Fail
 import com.airbnb.mvrx.Incomplete
@@ -100,9 +101,22 @@ class RoomMemberProfileFragment @Inject constructor(
                 is Success -> {
                     when (val action = async.invoke()) {
                         is RoomMemberProfileAction.VerifyUser -> {
+                            if (action.canCrossSign == true) {
                                 VerificationBottomSheet
                                         .withArgs(roomId = null, otherUserId = action.userId!!)
                                         .show(parentFragmentManager, "VERIF")
+                            } else {
+                                AlertDialog.Builder(requireContext())
+                                        .setTitle(R.string.dialog_title_warning)
+                                        .setMessage(R.string.verify_cannot_cross_sign)
+                                        .setPositiveButton(R.string.verification_profile_verify) { _, _ ->
+                                            VerificationBottomSheet
+                                                    .withArgs(roomId = null, otherUserId = action.userId!!)
+                                                    .show(parentFragmentManager, "VERIF")
+                                        }
+                                        .setNegativeButton(R.string.cancel, null)
+                                        .show()
+                            }
                         }
                     }
                 }

vector/src/main/java/im/vector/riotx/features/roommemberprofile/RoomMemberProfileViewModel.kt

@@ -149,7 +149,12 @@ class RoomMemberProfileViewModel @AssistedInject constructor(@Assisted private v
             if (!state.isMine && state.userMXCrossSigningInfo?.isTrusted() == false) {
                 // ok, let's find or create the DM room
                 _actionResultLiveData.postValue(
-                        LiveEvent(Success(action.copy(userId = state.userId)))
+                        LiveEvent(Success(
+                                action.copy(
+                                        userId = state.userId,
+                                        canCrossSign = session.getCrossSigningService().canCrossSign()
+                                )
+                        ))
                 )
             }
         }

vector/src/main/res/values/strings_riotX.xml

@@ -91,6 +91,8 @@
 
     <string name="unignore">Unignore</string>
 
+    <string name="verify_cannot_cross_sign">This session is unable to share this verification with your other sessions.\nThe verification will be saved locally and shared in a future version of the app.</string>
+
     <string name="room_list_sharing_header_recent_rooms">Recent rooms</string>
     <string name="room_list_sharing_header_other_rooms">Other rooms</string>