Add an in-room reminder to set up key recovery

This adds an in-room reminder above the message timeline to set up Secure
Message Recovery so that your keys will be backed up. If you try to ignore it,
an additional dialog is shown to confirm.

Fixes vector-im/riot-web#7783.

Signed-off-by: J. Ryan Stinnett <jryans@gmail.com>

src/components/structures/RoomView.js

@@ -607,6 +607,20 @@ module.exports = React.createClass({
         }
     },
 
+    async onRoomRecoveryReminderFinished(backupCreated) {
+        // If the user cancelled the key backup dialog, it suggests they don't
+        // want to be reminded anymore.
+        if (!backupCreated) {
+            await SettingsStore.setValue(
+                "showRoomRecoveryReminder",
+                null,
+                SettingLevel.ACCOUNT,
+                false,
+            );
+        }
+        this.forceUpdate();
+    },
+
     canResetTimeline: function() {
         if (!this.refs.messagePanel) {
             return true;
@@ -1521,6 +1535,7 @@ module.exports = React.createClass({
         const Loader = sdk.getComponent("elements.Spinner");
         const TimelinePanel = sdk.getComponent("structures.TimelinePanel");
         const RoomUpgradeWarningBar = sdk.getComponent("rooms.RoomUpgradeWarningBar");
+        const RoomRecoveryReminder = sdk.getComponent("rooms.RoomRecoveryReminder");
 
         if (!this.state.room) {
             if (this.state.roomLoading || this.state.peekLoading) {
@@ -1655,6 +1670,13 @@ module.exports = React.createClass({
             this.state.room.userMayUpgradeRoom(MatrixClientPeg.get().credentials.userId)
         );
 
+        const showRoomRecoveryReminder = (
+            SettingsStore.isFeatureEnabled("feature_keybackup") &&
+            SettingsStore.getValue("showRoomRecoveryReminder") &&
+            MatrixClientPeg.get().isRoomEncrypted(this.state.room.roomId) &&
+            !MatrixClientPeg.get().getKeyBackupEnabled()
+        );
+
         let aux = null;
         let hideCancel = false;
         if (this.state.editingRoomSettings) {
@@ -1669,6 +1691,9 @@ module.exports = React.createClass({
         } else if (showRoomUpgradeBar) {
             aux = <RoomUpgradeWarningBar room={this.state.room} />;
             hideCancel = true;
+        } else if (showRoomRecoveryReminder) {
+            aux = <RoomRecoveryReminder onFinished={this.onRoomRecoveryReminderFinished} />;
+            hideCancel = true;
         } else if (this.state.showingPinned) {
             hideCancel = true; // has own cancel
             aux = <PinnedEventsPanel room={this.state.room} onCancelClick={this.onPinnedClick} />;