Update device naming flow during link and sync

_locales/en/messages.json

@@ -4747,6 +4747,10 @@
     "messageformat": "Cancel transfer",
     "description": "Text of the cancel button at the bottom of backup import screen"
   },
+  "icu:BackupImportScreen__security-description": {
+    "messageformat": "Messages and chat info are protected by end-to-end encryption, including the sync process. <learnMoreLink>Learn more</learnMoreLink>",
+    "description": "Text shown while importing messages & chats from the user's primary device."
+  },
   "icu:BackupImportScreen__cancel-confirmation__title": {
     "messageformat": "Cancel transfer?",
     "description": "Title of the cancel confirmation modal in the backup import screen"

stylesheets/components/InstallScreenBackupImportStep.scss

@@ -8,12 +8,17 @@
   width: 100vw;
   height: 100vh;
 
-  justify-content: center;
+  flex-direction: column;
   align-items: center;
 }
 
 .InstallScreenBackupImportStep__content {
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
   text-align: center;
+  margin-top: 64px;
+  flex: 1;
 }
 
 .InstallScreenBackupImportStep__title {
@@ -55,9 +60,6 @@
   @include button-focus-outline;
   @include font-body-1-bold;
 
-  position: absolute;
-  bottom: 48px;
-
   @include light-theme() {
     color: $color-ultramarine;
   }
@@ -66,3 +68,56 @@
     color: $color-ultramarine-light;
   }
 }
+
+.InstallScreenBackupImportStep__footer {
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+  margin-bottom: 36px;
+  min-height: 94px;
+  gap: 26px;
+}
+
+.InstallScreenBackupImportStep__security {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  max-width: 336px;
+
+  &--icon::after {
+    @include light-theme {
+      @include color-svg(
+        '../images/icons/v3/lock/lock.svg',
+        rgba($color-gray-60, 0.8)
+      );
+    }
+
+    @include dark-theme {
+      @include color-svg('../images/icons/v3/lock/lock.svg', $color-gray-25);
+    }
+
+    content: '';
+    display: block;
+    height: 16px;
+    width: 16px;
+    margin-bottom: 4px;
+  }
+
+  &--description {
+    @include font-caption;
+    text-align: center;
+
+    @include light-theme {
+      color: rgba($color-gray-60, 0.8);
+    }
+
+    @include dark-theme {
+      color: $color-gray-25;
+    }
+
+    a {
+      text-decoration: none;
+    }
+  }
+}

ts/components/installScreen/InstallScreenBackupImportStep.tsx

@@ -12,6 +12,8 @@ import { ConfirmationDialog } from '../ConfirmationDialog';
 import { InstallScreenSignalLogo } from './InstallScreenSignalLogo';
 import { roundFractionForProgressBar } from '../../util/numbers';
 import { missingCaseError } from '../../util/missingCaseError';
+import { SYNCING_MESSAGES_SECURITY_URL } from '../../types/support';
+import { I18n } from '../I18n';
 
 // We can't always use destructuring assignment because of the complexity of this props
 //   type.
@@ -115,12 +117,17 @@ export function InstallScreenBackupImportStep({
     );
   }
 
+  const learnMoreLink = (parts: Array<string | JSX.Element>) => (
+    <a href={SYNCING_MESSAGES_SECURITY_URL} rel="noreferrer" target="_blank">
+      {parts}
+    </a>
+  );
+
   return (
     <div className="InstallScreenBackupImportStep">
       <TitlebarDragArea />
 
       <InstallScreenSignalLogo />
-
       <div className="InstallScreenBackupImportStep__content">
         <h3 className="InstallScreenBackupImportStep__title">
           {i18n('icu:BackupImportScreen__title')}
@@ -130,16 +137,28 @@ export function InstallScreenBackupImportStep({
           {i18n('icu:BackupImportScreen__description')}
         </div>
       </div>
+      <div className="InstallScreenBackupImportStep__footer">
+        <div className="InstallScreenBackupImportStep__security">
+          <div className="InstallScreenBackupImportStep__security--icon" />
+          <div className="InstallScreenBackupImportStep__security--description">
+            <I18n
+              i18n={i18n}
+              id="icu:BackupImportScreen__security-description"
+              components={{ learnMoreLink }}
+            />
+          </div>
+        </div>
 
-      {backupStep === InstallScreenBackupStep.Download && (
+        {backupStep === InstallScreenBackupStep.Download && (
-        <button
+          <button
-          className="InstallScreenBackupImportStep__cancel"
+            className="InstallScreenBackupImportStep__cancel"
-          type="button"
+            type="button"
-          onClick={confirmCancel}
+            onClick={confirmCancel}
-        >
+          >
-          {i18n('icu:BackupImportScreen__cancel')}
+            {i18n('icu:BackupImportScreen__cancel')}
-        </button>
+          </button>
-      )}
+        )}
+      </div>
 
       {isConfirmingCancel && (
         <ConfirmationDialog

ts/state/ducks/installer.ts

@@ -28,6 +28,7 @@ import type { BoundActionCreatorsMapObject } from '../../hooks/useBoundActions';
 import { useBoundActions } from '../../hooks/useBoundActions';
 import * as log from '../../logging/log';
 import { backupsService } from '../../services/backups';
+import OS from '../../util/os/osMain';
 
 const SLEEP_ERROR = new TimeoutError();
 
@@ -318,26 +319,30 @@ function startInstaller(): ThunkAction<
     }
     provisionerByBaton.set(baton, provisioner);
 
-    // Switch to next UI phase
+    if (provisioner.isLinkAndSync()) {
-    dispatch({
+      dispatch(finishInstall({ deviceName: OS.getName() || 'Signal Desktop' }));
-      type: QR_CODE_SCANNED,
+    } else {
-      payload: {
+      // Show screen to choose device name
-        deviceName:
+      dispatch({
-          window.textsecure.storage.user.getDeviceName() ||
+        type: QR_CODE_SCANNED,
-          window.getHostName() ||
+        payload: {
-          '',
+          deviceName:
-        baton,
+            window.textsecure.storage.user.getDeviceName() ||
-      },
+            window.getHostName() ||
-    });
+            '',
+          baton,
+        },
+      });
 
-    // And feed it the CI data if present
+      // And feed it the CI data if present
-    const { SignalCI } = window;
+      const { SignalCI } = window;
-    if (SignalCI != null) {
+      if (SignalCI != null) {
-      dispatch(
+        dispatch(
-        finishInstall({
+          finishInstall({
-          deviceName: SignalCI.deviceName,
+            deviceName: SignalCI.deviceName,
-        })
+          })
-      );
+        );
+      }
     }
   };
 }
@@ -356,8 +361,9 @@ function finishInstall(
   return async (dispatch, getState) => {
     const state = getState();
     strictAssert(
-      state.installer.step === InstallScreenStep.ChoosingDeviceName,
+      state.installer.step === InstallScreenStep.ChoosingDeviceName ||
-      'Not choosing device name'
+        state.installer.step === InstallScreenStep.QrCodeNotScanned,
+      'Wrong step'
     );
 
     const { baton } = state.installer;
@@ -367,6 +373,13 @@ function finishInstall(
       'Provisioner is not waiting for device info'
     );
 
+    if (state.installer.step === InstallScreenStep.QrCodeNotScanned) {
+      strictAssert(
+        provisioner.isLinkAndSync(),
+        'Can only skip device naming if link & sync'
+      );
+    }
+
     // Cleanup
     controllerByBaton.delete(baton);
     provisionerByBaton.delete(baton);
@@ -563,8 +576,8 @@ export function reducer(
 
   if (action.type === SHOW_BACKUP_IMPORT) {
     if (
-      // Downloading backup after linking
+      //  Downloading backup after linking
-      state.step !== InstallScreenStep.ChoosingDeviceName &&
+      state.step !== InstallScreenStep.QrCodeNotScanned &&
       // Restarting backup download on startup
       state.step !== InstallScreenStep.NotStarted
     ) {

ts/types/support.ts

@@ -9,3 +9,5 @@ export const LINK_SIGNAL_DESKTOP =
   'https://support.signal.org/hc/articles/360007320451#desktop_multiple_device';
 export const SAFETY_NUMBER_URL =
   'https://support.signal.org/hc/articles/360007060632';
+export const SYNCING_MESSAGES_SECURITY_URL =
+  'https://support.signal.org/hc/articles/360007320391';