Introduce Lock Screen and Passcode (#1839)

2022-05-31 20:58:35 +04:00 · 2022-05-31 20:58:35 +04:00 · 017170c2e2
commit 017170c2e2
parent fa6eec434f
79 changed files with 1905 additions and 501 deletions
--- a/package-lock.json
+++ b/package-lock.json
@ -86,7 +86,7 @@
        "stylelint": "^14.6.1",
        "stylelint-config-recommended-scss": "^6.0.0",
        "stylelint-declaration-block-no-ignored-properties": "^2.5.0",
-        "stylelint-group-selectors": "^1.0.8",
+        "stylelint-group-selectors": "^1.0.6",
        "stylelint-high-performance-animation": "^1.6.0",
        "telegraph-node": "^1.0.4",
        "typescript": "^4.6.3",
--- a/package.json
+++ b/package.json
@ -103,7 +103,7 @@
    "stylelint": "^14.6.1",
    "stylelint-config-recommended-scss": "^6.0.0",
    "stylelint-declaration-block-no-ignored-properties": "^2.5.0",
-    "stylelint-group-selectors": "^1.0.8",
+    "stylelint-group-selectors": "^1.0.6",
    "stylelint-high-performance-animation": "^1.6.0",
    "telegraph-node": "^1.0.4",
    "typescript": "^4.6.3",
--- a/src/App.tsx
+++ b/src/App.tsx
@ -3,26 +3,45 @@ import React, { useEffect } from './lib/teact/teact';
 import { getActions, withGlobal } from './global';

 import type { GlobalState } from './global/types';
+import type { UiLoaderPage } from './components/common/UiLoader';

 import { INACTIVE_MARKER, PAGE_TITLE } from './config';
-import { pick } from './util/iteratees';
+import { PLATFORM_ENV } from './util/environment';
 import { updateSizes } from './util/windowSize';
 import { addActiveTabChangeListener } from './util/activeTabMonitor';
+import { hasStoredSession } from './util/sessions';
+import buildClassName from './util/buildClassName';
 import useFlag from './hooks/useFlag';
+import usePrevious from './hooks/usePrevious';

 import Auth from './components/auth/Auth';
-import UiLoader from './components/common/UiLoader';
 import Main from './components/main/Main.async';
+import LockScreen from './components/main/LockScreen.async';
 import AppInactive from './components/main/AppInactive';
-import { hasStoredSession } from './util/sessions';
+import Transition from './components/ui/Transition';
+import UiLoader from './components/common/UiLoader';
 // import Test from './components/test/TestNoRedundancy';

-type StateProps = Pick<GlobalState, 'authState'>;
+type StateProps = {
+  authState: GlobalState['authState'];
+  isScreenLocked?: boolean;
+};

-const App: FC<StateProps> = ({ authState }) => {
+enum AppScreens {
+  auth,
+  lock,
+  main,
+  inactive,
+}
+
+const App: FC<StateProps> = ({
+  authState,
+  isScreenLocked,
+}) => {
  const { disconnect } = getActions();

  const [isInactive, markInactive] = useFlag(false);
+  const isMobile = PLATFORM_ENV === 'iOS' || PLATFORM_ENV === 'Android';

  useEffect(() => {
    updateSizes();
@ -36,37 +55,89 @@ const App: FC<StateProps> = ({ authState }) => {

  // return <Test />;

-  if (isInactive) {
-    return <AppInactive />;
-  }
+  let activeKey: number;
+  let page: UiLoaderPage | undefined;

-  if (authState) {
+  if (isInactive) {
+    activeKey = AppScreens.inactive;
+  } else if (isScreenLocked) {
+    page = 'lock';
+    activeKey = AppScreens.lock;
+  } else if (authState) {
    switch (authState) {
      case 'authorizationStateWaitPhoneNumber':
+        page = 'authPhoneNumber';
+        activeKey = AppScreens.auth;
+        break;
      case 'authorizationStateWaitCode':
+        page = 'authCode';
+        activeKey = AppScreens.auth;
+        break;
      case 'authorizationStateWaitPassword':
+        page = 'authPassword';
+        activeKey = AppScreens.auth;
+        break;
      case 'authorizationStateWaitRegistration':
+        activeKey = AppScreens.auth;
+        break;
      case 'authorizationStateWaitQrCode':
-        return <Auth />;
+        page = 'authQrCode';
+        activeKey = AppScreens.auth;
+        break;
      case 'authorizationStateClosed':
      case 'authorizationStateClosing':
      case 'authorizationStateLoggingOut':
      case 'authorizationStateReady':
-        return renderMain();
+        page = 'main';
+        activeKey = AppScreens.main;
+        break;
+    }
+  } else if (hasStoredSession(true)) {
+    page = 'main';
+    activeKey = AppScreens.main;
+  } else {
+    page = isMobile ? 'authPhoneNumber' : 'authQrCode';
+    activeKey = AppScreens.auth;
+  }
+
+  const prevActiveKey = usePrevious(activeKey);
+
+  // eslint-disable-next-line consistent-return
+  function renderContent(isActive: boolean) {
+    switch (activeKey) {
+      case AppScreens.auth:
+        return <Auth isActive={isActive} />;
+      case AppScreens.main:
+        return <Main />;
+      case AppScreens.lock:
+        return <LockScreen isLocked={isScreenLocked} />;
+      case AppScreens.inactive:
+        return <AppInactive />;
    }
  }

-  return hasStoredSession(true) ? renderMain() : <Auth />;
-};
-
-function renderMain() {
  return (
-    <UiLoader page="main" key="main">
-      <Main />
+    <UiLoader key="Loader" page={page}>
+      <Transition
+        name="fade"
+        activeKey={activeKey}
+        shouldCleanup
+        className={buildClassName(
+          'full-height',
+          (activeKey === AppScreens.auth || prevActiveKey === AppScreens.auth) && 'is-auth',
+        )}
+      >
+        {renderContent}
+      </Transition>
    </UiLoader>
  );
-}
+};

 export default withGlobal(
-  (global): StateProps => pick(global, ['authState']),
+  (global): StateProps => {
+    return {
+      authState: global.authState,
+      isScreenLocked: global.passcode?.isScreenLocked,
+    };
+  },
 )(App);
--- a/src/api/gramjs/localDb.ts
+++ b/src/api/gramjs/localDb.ts
@ -13,7 +13,7 @@ interface LocalDb {
  webDocuments: Record<string, GramJs.TypeWebDocument>;
 }

-export default {
+const LOCAL_DB_INITIAL = {
  localMessages: {},
  chats: {},
  users: {},
@ -22,4 +22,12 @@ export default {
  stickerSets: {},
  photos: {},
  webDocuments: {},
-} as LocalDb;
+};
+
+const localDb: LocalDb = LOCAL_DB_INITIAL;
+
+export default localDb;
+
+export function clearLocalDb() {
+  Object.assign(localDb, LOCAL_DB_INITIAL);
+}
--- a/src/api/gramjs/methods/client.ts
+++ b/src/api/gramjs/methods/client.ts
@ -25,7 +25,7 @@ import { updater } from '../updater';
 import { setMessageBuilderCurrentUserId } from '../apiBuilders/messages';
 import downloadMediaWithClient, { parseMediaUrl } from './media';
 import { buildApiUserFromFull } from '../apiBuilders/users';
-import localDb from '../localDb';
+import localDb, { clearLocalDb } from '../localDb';
 import { buildApiPeerId } from '../apiBuilders/peers';
 import { addMessageToLocalDb } from '../helpers';

@ -102,7 +102,7 @@ export async function init(_onUpdate: OnApiUpdate, initialArgs: ApiInitialArgs)
      // eslint-disable-next-line no-console
      console.error(err);

-      if (err.message !== 'Disconnect') {
+      if (err.message !== 'Disconnect' && err.message !== 'Cannot send requests while disconnected') {
        onUpdate({
          '@type': 'updateConnectionState',
          connectionState: 'connectionStateBroken',
@ -134,8 +134,13 @@ export async function init(_onUpdate: OnApiUpdate, initialArgs: ApiInitialArgs)
  }
 }

-export async function destroy() {
-  await invokeRequest(new GramJs.auth.LogOut());
+export async function destroy(noLogOut = false) {
+  if (!noLogOut) {
+    await invokeRequest(new GramJs.auth.LogOut());
+  }
+
+  clearLocalDb();
+
  await client.destroy();
 }

--- a/src/assets/fonts/icomoon.woff
+++ b/src/assets/fonts/icomoon.woff
--- a/src/assets/fonts/icomoon.woff2
+++ b/src/assets/fonts/icomoon.woff2
--- a/src/assets/lock.png
+++ b/src/assets/lock.png
--- a/src/assets/mastercard.svg
+++ b/src/assets/mastercard.svg
@ -1,2 +1 @@
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--- a/src/assets/tgs/settings/Congratulations.tgs
+++ b/src/assets/tgs/settings/Congratulations.tgs
--- a/src/assets/tgs/settings/Lock.tgs
+++ b/src/assets/tgs/settings/Lock.tgs
--- a/src/assets/visa.svg
+++ b/src/assets/visa.svg
@ -1,2 +1 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<svg width="108.54" height="84.42" version="1.1" viewBox="0 0 108.54 84.42" xml:space="preserve" xmlns="http://www.w3.org/2000/svg" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><metadata><rdf:RDF><cc:Work rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/><dc:title/></cc:Work></rdf:RDF></metadata><g id="_x33_63-visa_x2C__Credit_card" transform="matrix(.23596 0 0 .23596 -6.1352 -18.195)"><path d="m486 115.44v281.11c0 21.165-17.17 38.335-38.333 38.335h-383.33c-21.163 0-38.333-17.17-38.333-38.335v-281.11c0-21.164 17.17-38.334 38.333-38.334h383.33c21.163 0 38.333 17.171 38.333 38.334z" fill="#0353a5"/><g fill="#fff"><path d="m421.79 192.11h-24.837c-7.666 0-13.498 2.237-16.771 10.302l-47.678 113.8h33.702s5.511-15.332 6.708-18.606h41.209c0.956 4.392 3.832 18.606 3.832 18.606h29.709zm-39.612 80.1c2.637-7.106 12.778-34.738 12.778-34.738-0.16 0.239 2.636-7.268 4.233-11.9l2.235 10.702s6.07 29.708 7.428 35.937h-26.674z"/><path d="m164.32 192.11-31.385 84.653-3.435-17.171-11.181-57.021c-1.837-7.906-7.507-10.142-14.535-10.461h-51.668l-0.56 2.476c12.618 3.195 23.879 7.827 33.701 13.656l28.591 107.81h33.94l50.471-123.94h-33.939z"/><polygon points="211.2 192.11 191.15 316.21 223.18 316.21 243.3 192.11"/><path d="m307.99 241.86c-11.26-5.67-18.128-9.504-18.128-15.333 0.159-5.271 5.829-10.702 18.448-10.702 10.461-0.24 18.128 2.237 23.877 4.711l2.876 1.358 4.392-26.833c-6.31-2.477-16.371-5.272-28.75-5.272-31.704 0-53.985 16.932-54.145 41.049-0.24 17.809 15.971 27.713 28.11 33.701 12.379 6.068 16.611 10.063 16.611 15.413-0.159 8.307-10.063 12.14-19.247 12.14-12.777 0-19.646-1.998-30.105-6.627l-4.234-1.999-4.472 27.871c7.505 3.435 21.402 6.47 35.777 6.631 33.701 0.078 55.663-16.614 55.902-42.328 0.162-14.134-8.463-24.916-26.912-33.78z"/></g></g></svg>
+<svg width="108.54" height="84.42" xml:space="preserve" xmlns="http://www.w3.org/2000/svg"><path d="M108.541 9.044v66.33c0 4.995-4.051 9.046-9.045 9.046H9.046C4.052 84.42 0 80.37 0 75.375V9.045C0 4.05 4.052-.002 9.046-.002h90.45c4.994 0 9.045 4.052 9.045 9.045z" fill="#0353a5"/><path d="M93.39 27.135h-5.86c-1.809 0-3.185.528-3.957 2.431l-11.25 26.852h7.952s1.3-3.617 1.583-4.39h9.723c.226 1.036.904 4.39.904 4.39h7.01zm-9.346 18.9c.622-1.676 3.015-8.196 3.015-8.196-.038.056.622-1.715.998-2.808l.528 2.525s1.432 7.01 1.753 8.48h-6.294zm-51.406-18.9L25.232 47.11l-.81-4.052-2.639-13.454c-.433-1.866-1.771-2.393-3.43-2.469H6.164l-.133.585c2.977.753 5.634 1.846 7.952 3.222l6.746 25.439h8.009l11.909-29.245h-8.008zm11.062 0-4.731 29.283h7.557l4.748-29.283zm22.838 11.739c-2.657-1.338-4.277-2.242-4.277-3.618.037-1.243 1.375-2.525 4.353-2.525 2.468-.057 4.277.528 5.634 1.112l.678.32 1.037-6.331c-1.49-.585-3.863-1.244-6.784-1.244-7.481 0-12.739 3.995-12.776 9.686-.057 4.202 3.768 6.539 6.633 7.952 2.92 1.431 3.92 2.374 3.92 3.636-.038 1.96-2.375 2.865-4.542 2.865-3.015 0-4.636-.471-7.104-1.564l-1-.471-1.054 6.576c1.77.81 5.05 1.527 8.442 1.565 7.952.018 13.134-3.92 13.19-9.988.039-3.335-1.997-5.88-6.35-7.97z" fill="#fff"/></svg>
--- a/src/bundles/main.ts
+++ b/src/bundles/main.ts
@ -4,12 +4,14 @@ import { DEBUG } from '../config';

 // eslint-disable-next-line import/no-cycle
 export { default as Main } from '../components/main/Main';
+export { default as LockScreen } from '../components/main/LockScreen';

 if (DEBUG) {
  // eslint-disable-next-line no-console
  console.log('>>> FINISH LOAD MAIN BUNDLE');
 }

-if (!getGlobal().connectionState) {
+const { connectionState, passcode: { isScreenLocked } } = getGlobal();
+if (!connectionState && !isScreenLocked) {
  getActions().initApi();
 }
--- a/src/components/auth/Auth.tsx
+++ b/src/components/auth/Auth.tsx
@ -9,8 +9,8 @@ import { pick } from '../../util/iteratees';
 import { PLATFORM_ENV } from '../../util/environment';
 import windowSize from '../../util/windowSize';
 import useHistoryBack from '../../hooks/useHistoryBack';
+import useCurrentOrPrev from '../../hooks/useCurrentOrPrev';

-import UiLoader from '../common/UiLoader';
 import AuthPhoneNumber from './AuthPhoneNumber';
 import AuthCode from './AuthCode.async';
 import AuthPassword from './AuthPassword.async';
@ -19,19 +19,25 @@ import AuthQrCode from './AuthQrCode';

 import './Auth.scss';

+type OwnProps = {
+  isActive: boolean;
+};
+
 type StateProps = Pick<GlobalState, 'authState'>;

-const Auth: FC<StateProps> = ({
-  authState,
+const Auth: FC<OwnProps & StateProps> = ({
+  isActive, authState,
 }) => {
  const {
    reset, initApi, returnToAuthPhoneNumber, goToAuthQrCode,
  } = getActions();

  useEffect(() => {
-    reset();
-    initApi();
-  }, [reset, initApi]);
+    if (isActive) {
+      reset();
+      initApi();
+    }
+  }, [isActive, reset, initApi]);

  const isMobile = PLATFORM_ENV === 'iOS' || PLATFORM_ENV === 'Android';

@ -58,24 +64,28 @@ const Auth: FC<StateProps> = ({
    };
  }, []);

-  switch (authState) {
+  // For animation purposes
+  const renderingAuthState = useCurrentOrPrev(
+    authState !== 'authorizationStateReady' ? authState : undefined,
+    true,
+  );
+
+  switch (renderingAuthState) {
    case 'authorizationStateWaitCode':
-      return <UiLoader page="authCode" key="authCode"><AuthCode /></UiLoader>;
+      return <AuthCode />;
    case 'authorizationStateWaitPassword':
-      return <UiLoader page="authPassword" key="authPassword"><AuthPassword /></UiLoader>;
+      return <AuthPassword />;
    case 'authorizationStateWaitRegistration':
      return <AuthRegister />;
    case 'authorizationStateWaitPhoneNumber':
-      return <UiLoader page="authPhoneNumber" key="authPhoneNumber"><AuthPhoneNumber /></UiLoader>;
+      return <AuthPhoneNumber />;
    case 'authorizationStateWaitQrCode':
-      return <UiLoader page="authQrCode" key="authQrCode"><AuthQrCode /></UiLoader>;
+      return <AuthQrCode />;
    default:
-      return isMobile
-        ? <UiLoader page="authPhoneNumber" key="authPhoneNumber"><AuthPhoneNumber /></UiLoader>
-        : <UiLoader page="authQrCode" key="authQrCode"><AuthQrCode /></UiLoader>;
+      return isMobile ? <AuthPhoneNumber /> : <AuthQrCode />;
  }
 };

-export default memo(withGlobal(
+export default memo(withGlobal<OwnProps>(
  (global): StateProps => pick(global, ['authState']),
 )(Auth));
--- a/src/components/calls/group/GroupCallParticipantMenu.tsx
+++ b/src/components/calls/group/GroupCallParticipantMenu.tsx
@ -8,6 +8,7 @@ import { getActions, withGlobal } from '../../../global';
 import type { IAnchorPosition } from '../../../types';

 import buildClassName from '../../../util/buildClassName';
+import buildStyle from '../../../util/buildStyle';
 import useRunThrottled from '../../../hooks/useRunThrottled';
 import useFlag from '../../../hooks/useFlag';
 import useLang from '../../../hooks/useLang';
@ -147,7 +148,7 @@ const GroupCallParticipantMenu: FC<OwnProps & StateProps> = ({
        isOpen={isDropdownOpen}
        positionX="right"
        autoClose
-        style={anchor ? `right: 1rem; top: ${anchor.y}px;` : undefined}
+        style={buildStyle(anchor && `right: 1rem; top: ${anchor.y}px`)}
        onClose={closeDropdown}
        className="participant-menu"
      >
--- a/src/components/common/AnimatedEmoji.tsx
+++ b/src/components/common/AnimatedEmoji.tsx
@ -18,7 +18,7 @@ import AnimatedSticker from './AnimatedSticker';
 import './AnimatedEmoji.scss';

 type OwnProps = {
-  sticker: ApiSticker;
+  sticker?: ApiSticker;
  effect?: ApiSticker;
  isOwn?: boolean;
  soundId?: string;
@ -56,13 +56,13 @@ const AnimatedEmoji: FC<OwnProps> = ({
    playKey,
  } = useAnimatedEmoji(size, chatId, messageId, soundId, activeEmojiInteractions, isOwn, undefined, effect?.emoji);

-  const localMediaHash = `sticker${sticker.id}`;
+  const localMediaHash = `sticker${sticker?.id}`;

  const isIntersecting = useIsIntersecting(ref, observeIntersection);

-  const thumbDataUri = sticker.thumbnail?.dataUri;
+  const thumbDataUri = sticker?.thumbnail?.dataUri;
  const previewBlobUrl = useMedia(
-    `${localMediaHash}?size=m`,
+    sticker ? `${localMediaHash}?size=m` : undefined,
    !isIntersecting && !forceLoadPreview,
    ApiMediaFormat.BlobUrl,
    lastSyncTime,
@ -75,7 +75,7 @@ const AnimatedEmoji: FC<OwnProps> = ({
  return (
    <div
      ref={ref}
-      className={buildClassName('AnimatedEmoji media-inner', sticker.id === LIKE_STICKER_ID && 'like-sticker-thumb')}
+      className={buildClassName('AnimatedEmoji media-inner', sticker?.id === LIKE_STICKER_ID && 'like-sticker-thumb')}
      style={style}
      onClick={handleClick}
    >
--- a/src/components/common/PasswordForm.tsx
+++ b/src/components/common/PasswordForm.tsx
@ -18,8 +18,12 @@ type OwnProps = {
  hint?: string;
  placeholder?: string;
  isLoading?: boolean;
+  shouldDisablePasswordManager?: boolean;
+  shouldShowSubmit?: boolean;
+  shouldResetValue?: boolean;
  isPasswordVisible?: boolean;
  clearError: NoneToVoidFunction;
+  noRipple?: boolean;
  onChangePasswordVisibility: (state: boolean) => void;
  onInputChange?: (password: string) => void;
  onSubmit: (password: string) => void;
@ -34,6 +38,10 @@ const PasswordForm: FC<OwnProps> = ({
  hint,
  placeholder = 'Password',
  submitLabel = 'Next',
+  shouldShowSubmit,
+  shouldResetValue,
+  shouldDisablePasswordManager = false,
+  noRipple = false,
  clearError,
  onChangePasswordVisibility,
  onInputChange,
@ -46,6 +54,12 @@ const PasswordForm: FC<OwnProps> = ({
  const [password, setPassword] = useState('');
  const [canSubmit, setCanSubmit] = useState(false);

+  useEffect(() => {
+    if (shouldResetValue) {
+      setPassword('');
+    }
+  }, [shouldResetValue]);
+
  useTimeout(() => {
    if (!IS_TOUCH_ENV) {
      inputRef.current!.focus();
@ -102,8 +116,9 @@ const PasswordForm: FC<OwnProps> = ({
          type={isPasswordVisible ? 'text' : 'password'}
          id="sign-in-password"
          value={password || ''}
-          autoComplete="current-password"
+          autoComplete={shouldDisablePasswordManager ? 'one-time-code' : 'current-password'}
          onChange={onPasswordChange}
+          maxLength={256}
          dir="auto"
        />
        <label>{error || hint || placeholder}</label>
@ -117,8 +132,8 @@ const PasswordForm: FC<OwnProps> = ({
          <i className={isPasswordVisible ? 'icon-eye' : 'icon-eye-closed'} />
        </div>
      </div>
-      {canSubmit && (
-        <Button type="submit" ripple isLoading={isLoading}>
+      {(canSubmit || shouldShowSubmit) && (
+        <Button type="submit" ripple={!noRipple} isLoading={isLoading} disabled={!canSubmit}>
          {submitLabel}
        </Button>
      )}
--- a/src/components/common/UiLoader.module.scss
+++ b/src/components/common/UiLoader.module.scss
@ -0,0 +1,115 @@
+.root {
+  height: 100%;
+
+  background-color: var(--theme-background-color);
+  background-repeat: no-repeat;
+  background-size: 100% 100%;
+
+  @media (max-width: 600px) {
+    height: calc(var(--vh, 1vh) * 100);
+  }
+
+  :global(html.theme-light) & {
+    background-image: url('../../assets/chat-bg-br.png');
+  }
+
+  &::before {
+    content: "";
+    position: absolute;
+    top: 0;
+    left: 0;
+    bottom: 0;
+    right: 0;
+    background-image: url('../../assets/chat-bg-pattern-light.png');
+    background-position: top right;
+    background-size: 510px auto;
+    background-repeat: repeat;
+    mix-blend-mode: overlay;
+
+    :global(html.theme-dark) & {
+      background-image: url('../../assets/chat-bg-pattern-dark.png');
+      mix-blend-mode: unset;
+    }
+  }
+}
+
+.mask {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  margin: 0 auto;
+  width: 100%;
+  height: 100%;
+  z-index: var(--z-ui-loader-mask);
+  display: flex;
+
+  @media (min-width: 600px) {
+    display: grid;
+    grid-template-columns: auto 1fr;
+    grid-template-rows: 100%;
+  }
+}
+
+.left {
+  flex: 1;
+  background: var(--color-background);
+  min-width: 12rem;
+  width: 33vw;
+  max-width: 26.5rem;
+
+  @media (min-width: 926px) {
+    max-width: 40vw;
+  }
+
+  @media (min-width: 1276px) {
+    width: 25vw;
+    max-width: 33vw;
+  }
+
+  @media (max-width: 1275px) {
+    flex: 2;
+  }
+
+  @media (max-width: 925px) {
+    width: 26.5rem !important;
+  }
+
+  @media (max-width: 600px) {
+    max-width: none;
+    width: 100vw !important;
+  }
+}
+
+.middle {
+  flex: 3;
+  border-left: 1px solid var(--color-borders);
+  border-right: 1px solid var(--color-borders);
+  position: relative;
+  z-index: 1;
+  overflow: hidden;
+
+  @media (max-width: 1275px) {
+    border-right: none;
+  }
+
+  @media (max-width: 600px) {
+    display: none;
+  }
+}
+
+.right {
+  position: absolute;
+  top: 0;
+  right: 0;
+  z-index: 1;
+  height: 100%;
+  width: var(--right-column-width);
+  border-left: 1px solid var(--color-borders);
+  background: var(--color-background);
+}
+
+.blank {
+  flex: 1;
+  background: var(--color-background);
+}
--- a/src/components/common/UiLoader.scss
+++ b/src/components/common/UiLoader.scss
@ -1,91 +0,0 @@
-#UiLoader {
-  height: 100%;
-  @media (max-width: 600px) {
-    height: calc(var(--vh, 1vh) * 100);
-  }
-
-  > .wrapper {
-    height: 100%;
-  }
-
-  .mask {
-    position: fixed;
-    top: 0;
-    left: 0;
-    right: 0;
-    margin: 0 auto;
-    width: 100%;
-    height: 100%;
-    z-index: var(--z-ui-loader-mask);
-    display: flex;
-
-    @media (min-width: 600px) {
-      display: grid;
-      grid-template-columns: auto 1fr;
-      grid-template-rows: 100%;
-    }
-
-    .left {
-      flex: 1;
-      background: var(--color-background);
-      min-width: 12rem;
-      width: 33vw;
-      max-width: 26.5rem;
-
-      @media (min-width: 926px) {
-        max-width: 40vw;
-      }
-
-      @media (min-width: 1276px) {
-        width: 25vw;
-        max-width: 33vw;
-      }
-
-      @media (max-width: 1275px) {
-        flex: 2;
-      }
-
-      @media (max-width: 925px) {
-        width: 26.5rem !important;
-      }
-
-      @media (max-width: 600px) {
-        max-width: none;
-        width: 100vw !important;
-      }
-    }
-
-    .middle {
-      flex: 3;
-      border-left: 1px solid var(--color-borders);
-      border-right: 1px solid var(--color-borders);
-      position: relative;
-      z-index: 1;
-      overflow: hidden;
-
-      @media (max-width: 1275px) {
-        border-right: none;
-      }
-
-      @media (max-width: 600px) {
-        display: none;
-      }
-    }
-
-    .right {
-      position: absolute;
-      top: 0;
-      right: 0;
-      z-index: 1;
-      height: 100%;
-      width: var(--right-column-width);
-      border-left: 1px solid var(--color-borders);
-      background: var(--color-background);
-    }
-  }
-
-  .blank {
-    flex: 1;
-    background: var(--color-background);
-  }
-}
--- a/src/components/common/UiLoader.tsx
+++ b/src/components/common/UiLoader.tsx
@ -6,9 +6,9 @@ import { ApiMediaFormat } from '../../api/types';
 import type { GlobalState } from '../../global/types';
 import type { ThemeKey } from '../../types';

-import { DARK_THEME_BG_COLOR, LIGHT_THEME_BG_COLOR } from '../../config';
 import { getChatAvatarHash } from '../../global/helpers/chats'; // Direct import for better module splitting
 import { selectIsRightColumnShown, selectTheme } from '../../global/selectors';
+import { DARK_THEME_BG_COLOR, LIGHT_THEME_BG_COLOR } from '../../config';
 import useFlag from '../../hooks/useFlag';
 import useShowTransition from '../../hooks/useShowTransition';
 import { pause } from '../../util/schedulers';
@ -17,30 +17,32 @@ import preloadFonts from '../../util/fonts';
 import * as mediaLoader from '../../util/mediaLoader';
 import { Bundles, loadModule } from '../../util/moduleLoader';
 import buildClassName from '../../util/buildClassName';
-import buildStyle from '../../util/buildStyle';
-import useCustomBackground from '../../hooks/useCustomBackground';

-import './UiLoader.scss';
+import styles from './UiLoader.module.scss';

 import telegramLogoPath from '../../assets/telegram-logo.svg';
 import reactionThumbsPath from '../../assets/reaction-thumbs.png';
+import lockPreviewPath from '../../assets/lock.png';
 import monkeyPath from '../../assets/monkey.svg';

+export type UiLoaderPage =
+  'main'
+  | 'lock'
+  | 'authCode'
+  | 'authPassword'
+  | 'authPhoneNumber'
+  | 'authQrCode';
+
 type OwnProps = {
-  page: 'main' | 'authCode' | 'authPassword' | 'authPhoneNumber' | 'authQrCode';
+  page?: UiLoaderPage;
  children: React.ReactNode;
 };

-type StateProps =
-  Pick<GlobalState, 'uiReadyState' | 'shouldSkipHistoryAnimations'>
-  & {
-    isRightColumnShown?: boolean;
-    leftColumnWidth?: number;
-    isBackgroundBlurred?: boolean;
-    theme: ThemeKey;
-    customBackground?: string;
-    backgroundColor?: string;
-  };
+type StateProps = Pick<GlobalState, 'uiReadyState' | 'shouldSkipHistoryAnimations'> & {
+  isRightColumnShown?: boolean;
+  leftColumnWidth?: number;
+  theme: ThemeKey;
+};

 const MAX_PRELOAD_DELAY = 700;
 const SECOND_STATE_DELAY = 1000;
@ -81,6 +83,10 @@ const preloadTasks = {
  authCode: () => preloadImage(monkeyPath),
  authPassword: () => preloadImage(monkeyPath),
  authQrCode: preloadFonts,
+  lock: () => Promise.all([
+    preloadFonts(),
+    preloadImage(lockPreviewPath),
+  ]),
 };

 const UiLoader: FC<OwnProps & StateProps> = ({
@ -90,9 +96,6 @@ const UiLoader: FC<OwnProps & StateProps> = ({
  shouldSkipHistoryAnimations,
  leftColumnWidth,
  theme,
-  backgroundColor,
-  customBackground,
-  isBackgroundBlurred,
 }) => {
  const { setIsUiReady } = getActions();

@ -101,14 +104,12 @@ const UiLoader: FC<OwnProps & StateProps> = ({
    shouldRender: shouldRenderMask, transitionClassNames,
  } = useShowTransition(!isReady, undefined, true);

-  const customBackgroundValue = useCustomBackground(theme, customBackground);
-
  useEffect(() => {
    let timeout: number | undefined;

    const safePreload = async () => {
      try {
-        await preloadTasks[page]();
+        await preloadTasks[page!]();
      } catch (err) {
        // Do nothing
      }
@ -116,7 +117,7 @@ const UiLoader: FC<OwnProps & StateProps> = ({

    Promise.race([
      pause(MAX_PRELOAD_DELAY),
-      safePreload(),
+      page ? safePreload() : Promise.resolve(),
    ]).then(() => {
      markReady();
      setIsUiReady({ uiReadyState: 1 });
@ -137,38 +138,26 @@ const UiLoader: FC<OwnProps & StateProps> = ({
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

-  const middleClassName = buildClassName(
-    'middle bg-layers',
-    transitionClassNames,
-    customBackground && 'custom-bg-image',
-    backgroundColor && 'custom-bg-color',
-    customBackground && isBackgroundBlurred && 'blurred',
-    isRightColumnShown && 'with-right-column',
-  );
-  const inlineStyles = [
-    `--theme-background-color: ${backgroundColor || (theme === 'dark' ? DARK_THEME_BG_COLOR : LIGHT_THEME_BG_COLOR)}`,
-    customBackgroundValue && `--custom-background: ${customBackgroundValue}`,
-  ];
-
  return (
-    <div id="UiLoader">
+    <div
+      id="UiLoader"
+      className={styles.root}
+      style={`--theme-background-color: ${theme === 'dark' ? DARK_THEME_BG_COLOR : LIGHT_THEME_BG_COLOR}`}
+    >
      {children}
-      {shouldRenderMask && !shouldSkipHistoryAnimations && (
-        <div className={buildClassName('mask', transitionClassNames)}>
+      {shouldRenderMask && !shouldSkipHistoryAnimations && Boolean(page) && (
+        <div className={buildClassName(styles.mask, transitionClassNames)}>
          {page === 'main' ? (
            <>
              <div
-                className="left"
+                className={styles.left}
                style={leftColumnWidth ? `width: ${leftColumnWidth}px` : undefined}
              />
-              <div
-                className={middleClassName}
-                style={buildStyle(...inlineStyles)}
-              />
-              {isRightColumnShown && <div className="right" />}
+              <div className={buildClassName(styles.middle, transitionClassNames)} />
+              {isRightColumnShown && <div className={styles.right} />}
            </>
          ) : (
-            <div className="blank" />
+            <div className={styles.blank} />
          )}
        </div>
      )}
@ -179,9 +168,6 @@ const UiLoader: FC<OwnProps & StateProps> = ({
 export default withGlobal<OwnProps>(
  (global): StateProps => {
    const theme = selectTheme(global);
-    const {
-      isBlurred: isBackgroundBlurred, background: customBackground, backgroundColor,
-    } = global.settings.themes[theme] || {};

    return {
      shouldSkipHistoryAnimations: global.shouldSkipHistoryAnimations,
@ -189,9 +175,6 @@ export default withGlobal<OwnProps>(
      isRightColumnShown: selectIsRightColumnShown(global),
      leftColumnWidth: global.leftColumnWidth,
      theme,
-      customBackground,
-      isBackgroundBlurred,
-      backgroundColor,
    };
  },
 )(UiLoader);
--- a/src/components/common/helpers/animatedAssets.ts
+++ b/src/components/common/helpers/animatedAssets.ts
@ -10,6 +10,8 @@ import MonkeyPeek from '../../../assets/tgs/monkeys/TwoFactorSetupMonkeyPeek.tgs
 import FoldersAll from '../../../assets/tgs/settings/FoldersAll.tgs';
 import FoldersNew from '../../../assets/tgs/settings/FoldersNew.tgs';
 import DiscussionGroups from '../../../assets/tgs/settings/DiscussionGroupsDucks.tgs';
+import Lock from '../../../assets/tgs/settings/Lock.tgs';
+import Congratulations from '../../../assets/tgs/settings/Congratulations.tgs';

 import CameraFlip from '../../../assets/tgs/calls/CameraFlip.tgs';
 import HandFilled from '../../../assets/tgs/calls/HandFilled.tgs';
@ -37,6 +39,7 @@ export const ANIMATED_STICKERS_PATHS = {
  FoldersAll,
  FoldersNew,
  DiscussionGroups,
+  Lock,
  CameraFlip,
  HandFilled,
  HandOutline,
@ -51,6 +54,7 @@ export const ANIMATED_STICKERS_PATHS = {
  JoinRequest,
  Invite,
  QrPlane,
+  Congratulations,
 };

 export default function getAnimationData(name: keyof typeof ANIMATED_STICKERS_PATHS) {
--- a/src/components/left/LeftColumn.scss
+++ b/src/components/left/LeftColumn.scss
@ -4,7 +4,7 @@

 .left-header {
  height: var(--header-height);
-  padding: 0.375rem 1rem 0.5rem 0.8125rem;
+  padding: 0.375rem 0.8125rem 0.5rem 0.8125rem;
  display: flex;
  align-items: center;
  flex-shrink: 0;
@ -19,7 +19,7 @@
  }

  .SearchInput {
-    margin-left: 0.875rem;
+    margin-left: 0.8125rem;
    max-width: calc(100% - 3.25rem);

    @media (max-width: 600px) {
--- a/src/components/left/LeftColumn.tsx
+++ b/src/components/left/LeftColumn.tsx
@ -11,6 +11,7 @@ import captureEscKeyListener from '../../util/captureEscKeyListener';
 import useFoldersReducer from '../../hooks/reducers/useFoldersReducer';
 import { useResize } from '../../hooks/useResize';
 import { useHotkeys } from '../../hooks/useHotkeys';
+import useOnChange from '../../hooks/useOnChange';

 import Transition from '../ui/Transition';
 import LeftMain from './main/LeftMain';
@ -27,6 +28,8 @@ type StateProps = {
  shouldSkipHistoryAnimations?: boolean;
  leftColumnWidth?: number;
  currentUserId?: string;
+  hasPasscode?: boolean;
+  nextSettingsScreen?: SettingsScreens;
 };

 enum ContentType {
@ -50,6 +53,8 @@ const LeftColumn: FC<StateProps> = ({
  shouldSkipHistoryAnimations,
  leftColumnWidth,
  currentUserId,
+  hasPasscode,
+  nextSettingsScreen,
 }) => {
  const {
    setGlobalSearchQuery,
@ -61,6 +66,7 @@ const LeftColumn: FC<StateProps> = ({
    setLeftColumnWidth,
    resetLeftColumnWidth,
    openChat,
+    requestNextSettingsScreen,
  } = getActions();

  // eslint-disable-next-line no-null/no-null
@ -91,17 +97,30 @@ const LeftColumn: FC<StateProps> = ({
      break;
  }

-  const handleReset = useCallback((forceReturnToChatList?: boolean) => {
-    if (content === LeftColumnContent.NewGroupStep2
-      && !forceReturnToChatList
-    ) {
+  const handleReset = useCallback((forceReturnToChatList?: true | Event) => {
+    function fullReset() {
+      setContent(LeftColumnContent.ChatList);
+      setContactsFilter('');
+      setGlobalSearchQuery({ query: '' });
+      setGlobalSearchDate({ date: undefined });
+      setGlobalSearchChatId({ id: undefined });
+      resetChatCreation();
+      setTimeout(() => {
+        setLastResetTime(Date.now());
+      }, RESET_TRANSITION_DELAY_MS);
+    }
+
+    if (forceReturnToChatList === true) {
+      fullReset();
+      return;
+    }
+
+    if (content === LeftColumnContent.NewGroupStep2) {
      setContent(LeftColumnContent.NewGroupStep1);
      return;
    }

-    if (content === LeftColumnContent.NewChannelStep2
-      && !forceReturnToChatList
-    ) {
+    if (content === LeftColumnContent.NewChannelStep2) {
      setContent(LeftColumnContent.NewChannelStep1);
      return;
    }
@ -145,8 +164,33 @@ const LeftColumn: FC<StateProps> = ({
        case SettingsScreens.TwoFaDisabled:
        case SettingsScreens.TwoFaEnabled:
        case SettingsScreens.TwoFaCongratulations:
+        case SettingsScreens.PasscodeDisabled:
+        case SettingsScreens.PasscodeEnabled:
+        case SettingsScreens.PasscodeCongratulations:
          setSettingsScreen(SettingsScreens.Privacy);
          return;
+
+        case SettingsScreens.PasscodeNewPasscode:
+          setSettingsScreen(hasPasscode ? SettingsScreens.PasscodeEnabled : SettingsScreens.PasscodeDisabled);
+          return;
+
+        case SettingsScreens.PasscodeChangePasscodeCurrent:
+        case SettingsScreens.PasscodeTurnOff:
+          setSettingsScreen(SettingsScreens.PasscodeEnabled);
+          return;
+
+        case SettingsScreens.PasscodeNewPasscodeConfirm:
+          setSettingsScreen(SettingsScreens.PasscodeNewPasscode);
+          return;
+
+        case SettingsScreens.PasscodeChangePasscodeNew:
+          setSettingsScreen(SettingsScreens.PasscodeChangePasscodeCurrent);
+          return;
+
+        case SettingsScreens.PasscodeChangePasscodeConfirm:
+          setSettingsScreen(SettingsScreens.PasscodeChangePasscodeNew);
+          return;
+
        case SettingsScreens.PrivacyPhoneNumberAllowedContacts:
        case SettingsScreens.PrivacyPhoneNumberDeniedContacts:
          setSettingsScreen(SettingsScreens.PrivacyPhoneNumber);
@ -235,18 +279,10 @@ const LeftColumn: FC<StateProps> = ({
      return;
    }

-    setContent(LeftColumnContent.ChatList);
-    setContactsFilter('');
-    setGlobalSearchQuery({ query: '' });
-    setGlobalSearchDate({ date: undefined });
-    setGlobalSearchChatId({ id: undefined });
-    resetChatCreation();
-    setTimeout(() => {
-      setLastResetTime(Date.now());
-    }, RESET_TRANSITION_DELAY_MS);
+    fullReset();
  }, [
    content, activeChatFolder, settingsScreen, setGlobalSearchQuery, setGlobalSearchDate, setGlobalSearchChatId,
-    resetChatCreation,
+    resetChatCreation, hasPasscode,
  ]);

  const handleSearchQuery = useCallback((query: string) => {
@ -296,6 +332,14 @@ const LeftColumn: FC<StateProps> = ({
    }
  }, [clearTwoFaError, loadPasswordInfo, settingsScreen]);

+  useOnChange(() => {
+    if (nextSettingsScreen) {
+      setContent(LeftColumnContent.Settings);
+      setSettingsScreen(nextSettingsScreen);
+      requestNextSettingsScreen(undefined);
+    }
+  }, [nextSettingsScreen, requestNextSettingsScreen]);
+
  const {
    initResize, resetResize, handleMouseUp,
  } = useResize(resizeRef, setLeftColumnWidth, resetLeftColumnWidth, leftColumnWidth);
@ -401,6 +445,12 @@ export default memo(withGlobal(
      shouldSkipHistoryAnimations,
      leftColumnWidth,
      currentUserId,
+      passcode: {
+        hasPasscode,
+      },
+      settings: {
+        nextScreen: nextSettingsScreen,
+      },
    } = global;

    return {
@ -410,6 +460,8 @@ export default memo(withGlobal(
      shouldSkipHistoryAnimations,
      leftColumnWidth,
      currentUserId,
+      hasPasscode,
+      nextSettingsScreen,
    };
  },
 )(LeftColumn));
--- a/src/components/left/main/LeftMainHeader.scss
+++ b/src/components/left/main/LeftMainHeader.scss
@ -92,6 +92,10 @@
    @include overflow-y-overlay();
  }

+  .passcode-lock {
+    margin-left: 0.8125rem;
+  }
+
  // @optimization
  @include while-transition() {
    .Menu .bubble {
--- a/src/components/left/main/LeftMainHeader.tsx
+++ b/src/components/left/main/LeftMainHeader.tsx
@ -3,7 +3,7 @@ import React, { memo, useCallback, useMemo } from '../../../lib/teact/teact';
 import { getActions, withGlobal } from '../../../global';

 import type { ISettings } from '../../../types';
-import { LeftColumnContent } from '../../../types';
+import { LeftColumnContent, SettingsScreens } from '../../../types';
 import type { ApiChat } from '../../../api/types';
 import type { GlobalState } from '../../../global/types';

@ -18,7 +18,7 @@ import {
  IS_BETA,
  IS_TEST,
 } from '../../../config';
-import { IS_SINGLE_COLUMN_LAYOUT } from '../../../util/environment';
+import { IS_PWA, IS_SINGLE_COLUMN_LAYOUT } from '../../../util/environment';
 import buildClassName from '../../../util/buildClassName';
 import { formatDateToString } from '../../../util/dateFormat';
 import switchTheme from '../../../util/switchTheme';
@ -28,6 +28,7 @@ import { selectCurrentMessageList, selectTheme } from '../../../global/selectors
 import { isChatArchived } from '../../../global/helpers';
 import useLang from '../../../hooks/useLang';
 import useConnectionStatus from '../../../hooks/useConnectionStatus';
+import { useHotkeys } from '../../../hooks/useHotkeys';

 import DropdownMenu from '../../ui/DropdownMenu';
 import MenuItem from '../../ui/MenuItem';
@ -64,6 +65,7 @@ type StateProps =
    isMessageListOpen: boolean;
    isConnectionStatusMinimized: ISettings['isConnectionStatusMinimized'];
    areChatsLoaded?: boolean;
+    hasPasscode?: boolean;
  }
  & Pick<GlobalState, 'connectionState' | 'isSyncing'>;

@ -93,6 +95,7 @@ const LeftMainHeader: FC<OwnProps & StateProps> = ({
  isMessageListOpen,
  isConnectionStatusMinimized,
  areChatsLoaded,
+  hasPasscode,
 }) => {
  const {
    openChat,
@ -100,6 +103,8 @@ const LeftMainHeader: FC<OwnProps & StateProps> = ({
    setSettingOption,
    setGlobalSearchChatId,
    openChatByUsername,
+    lockScreen,
+    requestNextSettingsScreen,
  } = getActions();

  const lang = useLang();
@ -129,6 +134,23 @@ const LeftMainHeader: FC<OwnProps & StateProps> = ({
    lang, connectionState, isSyncing, isMessageListOpen, isConnectionStatusMinimized, !areChatsLoaded,
  );

+  const handleLockScreenHotkey = useCallback((e: KeyboardEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+    if (hasPasscode) {
+      lockScreen();
+    } else {
+      requestNextSettingsScreen(SettingsScreens.PasscodeDisabled);
+    }
+  }, [hasPasscode, lockScreen, requestNextSettingsScreen]);
+
+  useHotkeys({
+    'Ctrl+Shift+L': handleLockScreenHotkey,
+    'Alt+Shift+L': handleLockScreenHotkey,
+    'Meta+Shift+L': handleLockScreenHotkey,
+    ...(IS_PWA && { 'Meta+L': handleLockScreenHotkey }),
+  });
+
  const withOtherVersions = window.location.hostname === PRODUCTION_HOSTNAME || IS_TEST;

  const MainButton: FC<{ onTrigger: () => void; isOpen?: boolean }> = useMemo(() => {
@ -167,6 +189,12 @@ const LeftMainHeader: FC<OwnProps & StateProps> = ({
    openChat({ id: currentUserId, shouldReplaceHistory: true });
  }, [currentUserId, openChat]);

+  const handleSelectPasscode = useCallback(() => {
+    requestNextSettingsScreen(
+      hasPasscode ? SettingsScreens.PasscodeEnabled : SettingsScreens.PasscodeDisabled,
+    );
+  }, [hasPasscode, requestNextSettingsScreen]);
+
  const handleDarkModeToggle = useCallback((e: React.SyntheticEvent<HTMLElement>) => {
    e.stopPropagation();
    const newTheme = theme === 'light' ? 'dark' : 'light';
@ -197,6 +225,10 @@ const LeftMainHeader: FC<OwnProps & StateProps> = ({
    openChatByUsername({ username: lang('Settings.TipsUsername') });
  }, [lang, openChatByUsername]);

+  const handleLockScreen = useCallback(() => {
+    lockScreen();
+  }, [lockScreen]);
+
  const isSearchFocused = (
    Boolean(globalSearchChatId)
    || content === LeftColumnContent.GlobalSearch
@ -243,6 +275,13 @@ const LeftMainHeader: FC<OwnProps & StateProps> = ({
          >
            {lang('Settings')}
          </MenuItem>
+          <MenuItem
+            icon="lock"
+            onClick={handleSelectPasscode}
+          >
+            {lang('Passcode')}
+            <span className="menu-item-badge">{lang('New')}</span>
+          </MenuItem>
          <MenuItem
            icon="darkmode"
            onClick={handleDarkModeToggle}
@ -344,6 +383,19 @@ const LeftMainHeader: FC<OwnProps & StateProps> = ({
            />
          )}
        </SearchInput>
+        {hasPasscode && (
+          <Button
+            round
+            ripple={!IS_SINGLE_COLUMN_LAYOUT}
+            size="smaller"
+            color="translucent"
+            ariaLabel={`${lang('ShortcutsController.Others.LockByPasscode')} (Ctrl+Shift+L)`}
+            onClick={handleLockScreen}
+            className="passcode-lock"
+          >
+            <i className="icon-lock" />
+          </Button>
+        )}
        <ShowTransition
          isOpen={connectionStatusPosition === 'overlay'}
          isCustom
@ -383,6 +435,7 @@ export default memo(withGlobal<OwnProps>(
      isMessageListOpen: Boolean(selectCurrentMessageList(global)),
      isConnectionStatusMinimized,
      areChatsLoaded: Boolean(global.chats.listIds.active),
+      hasPasscode: Boolean(global.passcode.hasPasscode),
    };
  },
 )(LeftMainHeader));
--- a/src/components/left/settings/Settings.scss
+++ b/src/components/left/settings/Settings.scss
@ -40,10 +40,14 @@
  overflow-y: auto;
  @include overflow-y-overlay();

-  &.no-border, &.two-fa {
+  &.no-border, &.two-fa, &.local-passcode, &.password-form {
    border-top: none;
  }

+  &.password-form .input-group.error label::first-letter {
+    text-transform: uppercase;
+  }
+
  &.infinite-scroll {
    display: flex;
    flex-direction: column;
@ -152,7 +156,9 @@
    margin-top: -0.5rem;
    margin-bottom: 1.5rem;

-    .settings-content.two-fa & {
+    .settings-content.two-fa &,
+    .settings-content.password-form &,
+    .settings-content.local-passcode & {
      font-size: 1rem;
    }

--- a/src/components/left/settings/Settings.tsx
+++ b/src/components/left/settings/Settings.tsx
@ -1,5 +1,5 @@
 import type { FC } from '../../../lib/teact/teact';
-import React, { memo, useCallback } from '../../../lib/teact/teact';
+import React, { memo, useCallback, useState } from '../../../lib/teact/teact';

 import { SettingsScreens } from '../../../types';
 import type { FolderEditDispatch, FoldersState } from '../../../hooks/reducers/useFoldersReducer';
@ -25,6 +25,7 @@ import SettingsPrivacyBlockedUsers from './SettingsPrivacyBlockedUsers';
 import SettingsTwoFa from './twoFa/SettingsTwoFa';
 import SettingsPrivacyVisibilityExceptionList from './SettingsPrivacyVisibilityExceptionList';
 import SettingsQuickReaction from './SettingsQuickReaction';
+import SettingsPasscode from './passcode/SettingsPasscode';

 import './Settings.scss';

@ -50,6 +51,11 @@ const TWO_FA_SCREENS = [
  SettingsScreens.TwoFaRecoveryEmailCode,
 ];

+const PASSCODE_SCREENS = [
+  SettingsScreens.PasscodeDisabled,
+  SettingsScreens.PasscodeEnabled,
+];
+
 const FOLDERS_SCREENS = [
  SettingsScreens.Folders,
  SettingsScreens.FoldersCreateFolder,
@ -108,7 +114,7 @@ export type OwnProps = {
  foldersDispatch: FolderEditDispatch;
  onScreenSelect: (screen: SettingsScreens) => void;
  shouldSkipTransition?: boolean;
-  onReset: () => void;
+  onReset: (forceReturnToChatList?: true | Event) => void;
 };

 const Settings: FC<OwnProps> = ({
@ -121,8 +127,14 @@ const Settings: FC<OwnProps> = ({
  shouldSkipTransition,
 }) => {
  const [twoFaState, twoFaDispatch] = useTwoFaReducer();
+  const [privacyPasscode, setPrivacyPasscode] = useState<string>('');
+
+  const handleReset = useCallback((forceReturnToChatList?: true | Event) => {
+    if (forceReturnToChatList === true) {
+      onReset(true);
+      return;
+    }

-  const handleReset = useCallback(() => {
    if (
      currentScreen === SettingsScreens.FoldersCreateFolder
      || currentScreen === SettingsScreens.FoldersEditFolder
@ -168,9 +180,11 @@ const Settings: FC<OwnProps> = ({
    };

    const isTwoFaScreen = TWO_FA_SCREENS.includes(screen);
+    const isPasscodeScreen = PASSCODE_SCREENS.includes(screen);
    const isFoldersScreen = FOLDERS_SCREENS.includes(screen);
    const isPrivacyScreen = PRIVACY_SCREENS.includes(screen)
      || isTwoFaScreen
+      || isPasscodeScreen
      || Object.keys(privacyAllowScreens).includes(screen.toString())
      || Object.values(privacyAllowScreens).find((key) => key === true);

@ -191,10 +205,10 @@ const Settings: FC<OwnProps> = ({
          <SettingsGeneral
            onScreenSelect={onScreenSelect}
            isActive={isScreenActive
-            || screen === SettingsScreens.GeneralChatBackgroundColor
-            || screen === SettingsScreens.GeneralChatBackground
-            || screen === SettingsScreens.QuickReaction
-            || isPrivacyScreen || isFoldersScreen}
+              || screen === SettingsScreens.GeneralChatBackgroundColor
+              || screen === SettingsScreens.GeneralChatBackground
+              || screen === SettingsScreens.QuickReaction
+              || isPrivacyScreen || isFoldersScreen}
            onReset={handleReset}
          />
        );
@ -214,7 +228,7 @@ const Settings: FC<OwnProps> = ({
        return (
          <SettingsPrivacy
            onScreenSelect={onScreenSelect}
-            isActive={isScreenActive || isPrivacyScreen || isTwoFaScreen}
+            isActive={isScreenActive || isPrivacyScreen}
            onReset={handleReset}
          />
        );
@ -348,6 +362,27 @@ const Settings: FC<OwnProps> = ({
          />
        );

+      case SettingsScreens.PasscodeDisabled:
+      case SettingsScreens.PasscodeNewPasscode:
+      case SettingsScreens.PasscodeNewPasscodeConfirm:
+      case SettingsScreens.PasscodeChangePasscodeCurrent:
+      case SettingsScreens.PasscodeChangePasscodeNew:
+      case SettingsScreens.PasscodeChangePasscodeConfirm:
+      case SettingsScreens.PasscodeCongratulations:
+      case SettingsScreens.PasscodeEnabled:
+      case SettingsScreens.PasscodeTurnOff:
+        return (
+          <SettingsPasscode
+            currentScreen={currentScreen}
+            passcode={privacyPasscode}
+            onSetPasscode={setPrivacyPasscode}
+            shownScreen={screen}
+            isActive={isScreenActive}
+            onScreenSelect={onScreenSelect}
+            onReset={handleReset}
+          />
+        );
+
      default:
        return undefined;
    }
--- a/src/components/left/settings/SettingsHeader.tsx
+++ b/src/components/left/settings/SettingsHeader.tsx
@ -157,6 +157,23 @@ const SettingsHeader: FC<OwnProps> = ({
      case SettingsScreens.TwoFaRecoveryEmailCurrentPassword:
        return <h3>{lang('PleaseEnterCurrentPassword')}</h3>;

+      case SettingsScreens.PasscodeDisabled:
+      case SettingsScreens.PasscodeEnabled:
+      case SettingsScreens.PasscodeNewPasscode:
+      case SettingsScreens.PasscodeNewPasscodeConfirm:
+      case SettingsScreens.PasscodeCongratulations:
+        return <h3>{lang('Passcode')}</h3>;
+
+      case SettingsScreens.PasscodeTurnOff:
+        return <h3>{lang('PasscodeController.Disable.Title')}</h3>;
+
+      case SettingsScreens.PasscodeChangePasscodeCurrent:
+      case SettingsScreens.PasscodeChangePasscodeNew:
+        return <h3>{lang('PasscodeController.Change.Title')}</h3>;
+
+      case SettingsScreens.PasscodeChangePasscodeConfirm:
+        return <h3>{lang('PasscodeController.ReEnterPasscode.Placeholder')}</h3>;
+
      case SettingsScreens.Folders:
        return <h3>{lang('Filters')}</h3>;
      case SettingsScreens.FoldersCreateFolder:
--- a/src/components/left/settings/twoFa/SettingsTwoFaPassword.tsx
+++ b/src/components/left/settings/twoFa/SettingsTwoFaPassword.tsx
@ -1,15 +1,16 @@
-import type { FC } from '../../../../lib/teact/teact';
-import React, { memo, useCallback, useState } from '../../../../lib/teact/teact';
+import type { FC } from '../../../lib/teact/teact';
+import React, { memo, useCallback, useState } from '../../../lib/teact/teact';

-import useLang from '../../../../hooks/useLang';
-import useHistoryBack from '../../../../hooks/useHistoryBack';
+import useLang from '../../../hooks/useLang';
+import useHistoryBack from '../../../hooks/useHistoryBack';

-import PasswordMonkey from '../../../common/PasswordMonkey';
-import PasswordForm from '../../../common/PasswordForm';
+import PasswordMonkey from '../../common/PasswordMonkey';
+import PasswordForm from '../../common/PasswordForm';

 type OwnProps = {
  error?: string;
  isLoading?: boolean;
+  shouldDisablePasswordManager?: boolean;
  expectedPassword?: string;
  placeholder?: string;
  hint?: string;
@ -22,11 +23,12 @@ type OwnProps = {

 const EQUAL_PASSWORD_ERROR = 'Passwords Should Be Equal';

-const SettingsTwoFaPassword: FC<OwnProps> = ({
+const SettingsPasswordForm: FC<OwnProps> = ({
  isActive,
  onReset,
  error,
  isLoading,
+  shouldDisablePasswordManager,
  expectedPassword,
  placeholder = 'Current Password',
  hint,
@ -60,7 +62,7 @@ const SettingsTwoFaPassword: FC<OwnProps> = ({
  });

  return (
-    <div className="settings-content two-fa custom-scroll">
+    <div className="settings-content password-form custom-scroll">
      <div className="settings-content-header no-border">
        <PasswordMonkey isBig isPasswordVisible={shouldShowPassword} />
      </div>
@ -70,10 +72,12 @@ const SettingsTwoFaPassword: FC<OwnProps> = ({
          error={validationError || error}
          hint={hint}
          placeholder={placeholder}
+          shouldDisablePasswordManager={shouldDisablePasswordManager}
          submitLabel={submitLabel || lang('Next')}
          clearError={handleClearError}
          isLoading={isLoading}
          isPasswordVisible={shouldShowPassword}
+          shouldResetValue={isActive}
          onChangePasswordVisibility={setShouldShowPassword}
          onSubmit={handleSubmit}
        />
@ -82,4 +86,4 @@ const SettingsTwoFaPassword: FC<OwnProps> = ({
  );
 };

-export default memo(SettingsTwoFaPassword);
+export default memo(SettingsPasswordForm);
--- a/src/components/left/settings/SettingsPrivacy.tsx
+++ b/src/components/left/settings/SettingsPrivacy.tsx
@ -19,6 +19,7 @@ type OwnProps = {

 type StateProps = {
  hasPassword?: boolean;
+  hasPasscode?: boolean;
  blockedCount: number;
  isSensitiveEnabled?: boolean;
  canChangeSensitive?: boolean;
@ -36,6 +37,7 @@ const SettingsPrivacy: FC<OwnProps & StateProps> = ({
  onScreenSelect,
  onReset,
  hasPassword,
+  hasPasscode,
  blockedCount,
  isSensitiveEnabled,
  canChangeSensitive,
@ -112,6 +114,21 @@ const SettingsPrivacy: FC<OwnProps & StateProps> = ({
            )}
          </div>
        </ListItem>
+        <ListItem
+          icon="key"
+          narrow
+          // eslint-disable-next-line react/jsx-no-bind
+          onClick={() => onScreenSelect(
+            hasPasscode ? SettingsScreens.PasscodeEnabled : SettingsScreens.PasscodeDisabled,
+          )}
+        >
+          <div className="multiline-menu-item">
+            <span className="title">{lang('Passcode')}</span>
+            <span className="subtitle" dir="auto">
+              {lang(hasPasscode ? 'PasswordOn' : 'PasswordOff')}
+            </span>
+          </div>
+        </ListItem>
        <ListItem
          icon="lock"
          narrow
@ -247,14 +264,20 @@ export default memo(withGlobal<OwnProps>(
  (global): StateProps => {
    const {
      settings: {
-        byKey: { hasPassword, isSensitiveEnabled, canChangeSensitive },
+        byKey: {
+          hasPassword, isSensitiveEnabled, canChangeSensitive,
+        },
        privacy,
      },
      blocked,
+      passcode: {
+        hasPasscode,
+      },
    } = global;

    return {
      hasPassword,
+      hasPasscode: Boolean(hasPasscode),
      blockedCount: blocked.totalCount,
      isSensitiveEnabled,
      canChangeSensitive,
--- a/src/components/left/settings/passcode/SettingsPasscode.tsx
+++ b/src/components/left/settings/passcode/SettingsPasscode.tsx
@ -0,0 +1,225 @@
+import type { FC } from '../../../../lib/teact/teact';
+import React, { memo, useCallback } from '../../../../lib/teact/teact';
+import { getActions, withGlobal } from '../../../../global';
+
+import type { GlobalState } from '../../../../global/types';
+import { SettingsScreens } from '../../../../types';
+
+import useLang from '../../../../hooks/useLang';
+import { decryptSession } from '../../../../util/passcode';
+
+import SettingsPasscodeStart from './SettingsPasscodeStart';
+import SettingsPasscodeForm from '../SettingsPasswordForm';
+import SettingsPasscodeEnabled from './SettingsPasscodeEnabled';
+import SettingsPasscodeCongratulations from './SettingsPasscodeCongratulations';
+
+export type OwnProps = {
+  passcode: string;
+  currentScreen: SettingsScreens;
+  shownScreen: SettingsScreens;
+  isActive?: boolean;
+  onSetPasscode: (passcode: string) => void;
+  onScreenSelect: (screen: SettingsScreens) => void;
+  onReset: () => void;
+};
+
+type StateProps = GlobalState['passcode'];
+
+const SettingsPasscode: FC<OwnProps & StateProps> = ({
+  passcode,
+  currentScreen,
+  shownScreen,
+  error,
+  isActive,
+  isLoading,
+  onScreenSelect,
+  onSetPasscode,
+  onReset,
+}) => {
+  const {
+    setPasscode,
+    clearPasscode,
+    setPasscodeError,
+    clearPasscodeError,
+  } = getActions();
+
+  const lang = useLang();
+
+  const handleStartWizard = useCallback(() => {
+    onSetPasscode('');
+    onScreenSelect(SettingsScreens.PasscodeNewPasscode);
+  }, [onScreenSelect, onSetPasscode]);
+
+  const handleNewPassword = useCallback((value: string) => {
+    onSetPasscode(value);
+    onScreenSelect(SettingsScreens.PasscodeNewPasscodeConfirm);
+  }, [onScreenSelect, onSetPasscode]);
+
+  const handleNewPasswordConfirm = useCallback(() => {
+    setPasscode({ passcode });
+    onSetPasscode('');
+    onScreenSelect(SettingsScreens.PasscodeCongratulations);
+  }, [onScreenSelect, onSetPasscode, passcode, setPasscode]);
+
+  const handleChangePasswordCurrent = useCallback((currentPasscode: string) => {
+    onSetPasscode('');
+    decryptSession(currentPasscode).then(() => {
+      onScreenSelect(SettingsScreens.PasscodeChangePasscodeNew);
+    }, () => {
+      setPasscodeError({
+        error: lang('PasscodeController.Error.Current'),
+      });
+    });
+  }, [lang, onScreenSelect, onSetPasscode, setPasscodeError]);
+
+  const handleChangePasswordNew = useCallback((value: string) => {
+    onSetPasscode(value);
+    onScreenSelect(SettingsScreens.PasscodeChangePasscodeConfirm);
+  }, [onScreenSelect, onSetPasscode]);
+
+  const handleTurnOff = useCallback((currentPasscode: string) => {
+    decryptSession(currentPasscode).then(() => {
+      clearPasscode();
+      onScreenSelect(SettingsScreens.Privacy);
+    }, () => {
+      setPasscodeError({
+        error: lang('PasscodeController.Error.Current'),
+      });
+    });
+  }, [clearPasscode, lang, onScreenSelect, setPasscodeError]);
+
+  switch (currentScreen) {
+    case SettingsScreens.PasscodeDisabled:
+      return (
+        <SettingsPasscodeStart
+          onStart={handleStartWizard}
+          isActive={isActive || [
+            SettingsScreens.PasscodeNewPasscode,
+            SettingsScreens.PasscodeNewPasscodeConfirm,
+            SettingsScreens.PasscodeCongratulations,
+          ].includes(shownScreen)}
+          onReset={onReset}
+        />
+      );
+
+    case SettingsScreens.PasscodeNewPasscode:
+      return (
+        <SettingsPasscodeForm
+          shouldDisablePasswordManager
+          placeholder={lang('EnterNewPasscode')}
+          submitLabel={lang('Continue')}
+          onSubmit={handleNewPassword}
+          isActive={isActive || [
+            SettingsScreens.PasscodeNewPasscodeConfirm,
+            SettingsScreens.PasscodeCongratulations,
+          ].includes(shownScreen)}
+          onReset={onReset}
+        />
+      );
+
+    case SettingsScreens.PasscodeNewPasscodeConfirm:
+      return (
+        <SettingsPasscodeForm
+          shouldDisablePasswordManager
+          expectedPassword={passcode}
+          placeholder={lang('ReEnterYourPasscode')}
+          submitLabel={lang('Continue')}
+          isLoading={isLoading}
+          onSubmit={handleNewPasswordConfirm}
+          isActive={isActive || [
+            SettingsScreens.PasscodeCongratulations,
+          ].includes(shownScreen)}
+          onReset={onReset}
+        />
+      );
+
+    case SettingsScreens.PasscodeCongratulations:
+      return (
+        <SettingsPasscodeCongratulations
+          isActive={isActive}
+          onReset={onReset}
+        />
+      );
+
+    case SettingsScreens.PasscodeEnabled:
+      return (
+        <SettingsPasscodeEnabled
+          onScreenSelect={onScreenSelect}
+          isActive={isActive || [
+            SettingsScreens.PasscodeChangePasscodeCurrent,
+            SettingsScreens.PasscodeChangePasscodeNew,
+            SettingsScreens.PasscodeChangePasscodeConfirm,
+            SettingsScreens.PasscodeCongratulations,
+            SettingsScreens.PasscodeTurnOff,
+          ].includes(shownScreen)}
+          onReset={onReset}
+        />
+      );
+
+    case SettingsScreens.PasscodeChangePasscodeCurrent:
+      return (
+        <SettingsPasscodeForm
+          shouldDisablePasswordManager
+          error={error}
+          clearError={clearPasscodeError}
+          placeholder={lang('PasscodeController.Current.Placeholder')}
+          onSubmit={handleChangePasswordCurrent}
+          isActive={isActive || [
+            SettingsScreens.PasscodeChangePasscodeNew,
+            SettingsScreens.PasscodeChangePasscodeConfirm,
+            SettingsScreens.PasscodeCongratulations,
+          ].includes(shownScreen)}
+          onReset={onReset}
+        />
+      );
+
+    case SettingsScreens.PasscodeChangePasscodeNew:
+      return (
+        <SettingsPasscodeForm
+          shouldDisablePasswordManager
+          placeholder={lang('PleaseEnterNewFirstPassword')}
+          onSubmit={handleChangePasswordNew}
+          isActive={isActive || [
+            SettingsScreens.PasscodeChangePasscodeConfirm,
+            SettingsScreens.PasscodeCongratulations,
+          ].includes(shownScreen)}
+          onReset={onReset}
+        />
+      );
+
+    case SettingsScreens.PasscodeChangePasscodeConfirm:
+      return (
+        <SettingsPasscodeForm
+          shouldDisablePasswordManager
+          expectedPassword={passcode}
+          placeholder={lang('PasscodeController.ReEnterPasscode.Placeholder')}
+          isLoading={isLoading}
+          onSubmit={handleNewPasswordConfirm}
+          isActive={isActive || [
+            SettingsScreens.PasscodeCongratulations,
+          ].includes(shownScreen)}
+          onReset={onReset}
+        />
+      );
+
+    case SettingsScreens.PasscodeTurnOff:
+      return (
+        <SettingsPasscodeForm
+          shouldDisablePasswordManager
+          error={error ? lang(error) : undefined}
+          clearError={clearPasscodeError}
+          placeholder={lang('PasscodeController.Current.Placeholder')}
+          onSubmit={handleTurnOff}
+          isActive={isActive}
+          onReset={onReset}
+        />
+      );
+
+    default:
+      return undefined;
+  }
+};
+
+export default memo(withGlobal<OwnProps>(
+  (global): StateProps => ({ ...global.passcode }),
+)(SettingsPasscode));
--- a/src/components/left/settings/passcode/SettingsPasscodeCongratulations.tsx
+++ b/src/components/left/settings/passcode/SettingsPasscodeCongratulations.tsx
@ -0,0 +1,47 @@
+import type { FC } from '../../../../lib/teact/teact';
+import React, { memo, useCallback } from '../../../../lib/teact/teact';
+
+import { STICKER_SIZE_PASSCODE } from '../../../../config';
+import useLang from '../../../../hooks/useLang';
+import useHistoryBack from '../../../../hooks/useHistoryBack';
+
+import Button from '../../../ui/Button';
+import AnimatedIcon from '../../../common/AnimatedIcon';
+
+type OwnProps = {
+  isActive?: boolean;
+  onReset: (forceReturnToChatList?: boolean) => void;
+};
+
+const SettingsPasscodeCongratulations: FC<OwnProps> = ({
+  isActive, onReset,
+}) => {
+  const lang = useLang();
+
+  const fullReset = useCallback(() => {
+    onReset(true);
+  }, [onReset]);
+
+  useHistoryBack({ isActive, onBack: onReset });
+
+  return (
+    <div className="settings-content local-passcode custom-scroll">
+      <div className="settings-content-header no-border">
+        <AnimatedIcon size={STICKER_SIZE_PASSCODE} name="Congratulations" />
+
+        <p className="settings-item-description mb-3" dir="auto">
+          Congratulations!
+        </p>
+        <p className="settings-item-description mb-3" dir="auto">
+          Now you can lock the app with a passcode so that others can&apos;t open it.
+        </p>
+      </div>
+
+      <div className="settings-item pt-0">
+        <Button onClick={fullReset}>{lang('Back')}</Button>
+      </div>
+    </div>
+  );
+};
+
+export default memo(SettingsPasscodeCongratulations);
--- a/src/components/left/settings/passcode/SettingsPasscodeEnabled.tsx
+++ b/src/components/left/settings/passcode/SettingsPasscodeEnabled.tsx
@ -0,0 +1,66 @@
+import type { FC } from '../../../../lib/teact/teact';
+import React, { memo } from '../../../../lib/teact/teact';
+import { withGlobal } from '../../../../global';
+
+import type { ApiSticker } from '../../../../api/types';
+import { SettingsScreens } from '../../../../types';
+
+import { selectAnimatedEmoji } from '../../../../global/selectors';
+import useLang from '../../../../hooks/useLang';
+import useHistoryBack from '../../../../hooks/useHistoryBack';
+
+import ListItem from '../../../ui/ListItem';
+import AnimatedEmoji from '../../../common/AnimatedEmoji';
+
+type OwnProps = {
+  isActive?: boolean;
+  onScreenSelect: (screen: SettingsScreens) => void;
+  onReset: () => void;
+};
+
+type StateProps = {
+  animatedEmoji: ApiSticker;
+};
+
+const SettingsPasscodeEnabled: FC<OwnProps & StateProps> = ({
+  isActive, onReset, animatedEmoji, onScreenSelect,
+}) => {
+  const lang = useLang();
+
+  useHistoryBack({ isActive, onBack: onReset });
+
+  return (
+    <div className="settings-content local-passcode custom-scroll">
+      <div className="settings-content-header no-border">
+        <AnimatedEmoji sticker={animatedEmoji} size="large" />
+
+        <p className="settings-item-description mb-3" dir="auto">
+          Local passcode is enabled.
+        </p>
+      </div>
+
+      <div className="settings-item pt-0">
+        <ListItem
+          icon="edit"
+          // eslint-disable-next-line react/jsx-no-bind
+          onClick={() => onScreenSelect(SettingsScreens.PasscodeChangePasscodeCurrent)}
+        >
+          {lang('Passcode.Change')}
+        </ListItem>
+        <ListItem
+          icon="password-off"
+          // eslint-disable-next-line react/jsx-no-bind
+          onClick={() => onScreenSelect(SettingsScreens.PasscodeTurnOff)}
+        >
+          {lang('Passcode.TurnOff')}
+        </ListItem>
+      </div>
+    </div>
+  );
+};
+
+export default memo(withGlobal<OwnProps>((global) => {
+  return {
+    animatedEmoji: selectAnimatedEmoji(global, '🔐'),
+  };
+})(SettingsPasscodeEnabled));
--- a/src/components/left/settings/passcode/SettingsPasscodeStart.tsx
+++ b/src/components/left/settings/passcode/SettingsPasscodeStart.tsx
@ -0,0 +1,45 @@
+import type { FC } from '../../../../lib/teact/teact';
+import React, { memo } from '../../../../lib/teact/teact';
+
+import { STICKER_SIZE_PASSCODE } from '../../../../config';
+import useLang from '../../../../hooks/useLang';
+import useHistoryBack from '../../../../hooks/useHistoryBack';
+
+import Button from '../../../ui/Button';
+import AnimatedIcon from '../../../common/AnimatedIcon';
+
+type OwnProps = {
+  onStart: NoneToVoidFunction;
+  isActive?: boolean;
+  onReset: () => void;
+};
+
+const SettingsPasscodeStart: FC<OwnProps> = ({
+  isActive, onReset, onStart,
+}) => {
+  const lang = useLang();
+
+  useHistoryBack({ isActive, onBack: onReset });
+
+  return (
+    <div className="settings-content local-passcode custom-scroll">
+      <div className="settings-content-header no-border">
+        <AnimatedIcon size={STICKER_SIZE_PASSCODE} name="Lock" />
+
+        <p className="settings-item-description" dir="auto">
+          When you set up an additional passcode, a lock icon will appear on the chats page.
+          Tap it to lock and unlock your Telegram WebZ.
+        </p>
+        <p className="settings-item-description mb-3" dir="auto">
+          Note: if you forget your local passcode, you&apos;ll need to log out of Telegram WebZ and log in again.
+        </p>
+      </div>
+
+      <div className="settings-item pt-0">
+        <Button onClick={onStart}>{lang('EnablePasscode')}</Button>
+      </div>
+    </div>
+  );
+};
+
+export default memo(SettingsPasscodeStart);
--- a/src/components/left/settings/twoFa/SettingsTwoFa.tsx
+++ b/src/components/left/settings/twoFa/SettingsTwoFa.tsx
@ -9,7 +9,7 @@ import type { TwoFaDispatch, TwoFaState } from '../../../../hooks/reducers/useTw
 import useLang from '../../../../hooks/useLang';

 import SettingsTwoFaEnabled from './SettingsTwoFaEnabled';
-import SettingsTwoFaPassword from './SettingsTwoFaPassword';
+import SettingsTwoFaPassword from '../SettingsPasswordForm';
 import SettingsTwoFaStart from './SettingsTwoFaStart';
 import SettingsTwoFaSkippableForm from './SettingsTwoFaSkippableForm';
 import SettingsTwoFaCongratulations from './SettingsTwoFaCongratulations';
--- a/src/components/left/settings/twoFa/SettingsTwoFaCongratulations.tsx
+++ b/src/components/left/settings/twoFa/SettingsTwoFaCongratulations.tsx
@ -1,16 +1,14 @@
 import type { FC } from '../../../../lib/teact/teact';
 import React, { memo, useCallback } from '../../../../lib/teact/teact';
-import { withGlobal } from '../../../../global';

-import type { ApiSticker } from '../../../../api/types';
 import { SettingsScreens } from '../../../../types';

-import { selectAnimatedEmoji } from '../../../../global/selectors';
+import { STICKER_SIZE_TWO_FA } from '../../../../config';
 import useLang from '../../../../hooks/useLang';
 import useHistoryBack from '../../../../hooks/useHistoryBack';

 import Button from '../../../ui/Button';
-import AnimatedEmoji from '../../../common/AnimatedEmoji';
+import AnimatedIcon from '../../../common/AnimatedIcon';

 type OwnProps = {
  isActive?: boolean;
@ -18,12 +16,8 @@ type OwnProps = {
  onReset: () => void;
 };

-type StateProps = {
-  animatedEmoji: ApiSticker;
-};
-
-const SettingsTwoFaCongratulations: FC<OwnProps & StateProps> = ({
-  isActive, onReset, animatedEmoji, onScreenSelect,
+const SettingsTwoFaCongratulations: FC<OwnProps> = ({
+  isActive, onReset, onScreenSelect,
 }) => {
  const lang = useLang();

@ -39,7 +33,7 @@ const SettingsTwoFaCongratulations: FC<OwnProps & StateProps> = ({
  return (
    <div className="settings-content two-fa custom-scroll">
      <div className="settings-content-header no-border">
-        <AnimatedEmoji sticker={animatedEmoji} size="large" />
+        <AnimatedIcon size={STICKER_SIZE_TWO_FA} name="Congratulations" />

        <p className="settings-item-description mb-3" dir="auto">
          {lang('TwoStepVerificationPasswordSetInfo')}
@ -53,8 +47,4 @@ const SettingsTwoFaCongratulations: FC<OwnProps & StateProps> = ({
  );
 };

-export default memo(withGlobal<OwnProps>((global) => {
-  return {
-    animatedEmoji: selectAnimatedEmoji(global, '🥳'),
-  };
-})(SettingsTwoFaCongratulations));
+export default memo(SettingsTwoFaCongratulations);
--- a/src/components/main/AppInactive.scss
+++ b/src/components/main/AppInactive.scss
@ -10,6 +10,8 @@
    margin: auto;
    padding: 1.5rem;
    text-align: center;
+    background: var(--color-background);
+    border-radius: var(--border-radius-default);
  }

  .title {
--- a/src/components/main/LockScreen.async.tsx
+++ b/src/components/main/LockScreen.async.tsx
@ -0,0 +1,17 @@
+import type { FC } from '../../lib/teact/teact';
+import React, { memo } from '../../lib/teact/teact';
+import { Bundles } from '../../util/moduleLoader';
+
+import type { OwnProps } from './LockScreen';
+
+import useModuleLoader from '../../hooks/useModuleLoader';
+
+const LockScreenAsync: FC<OwnProps> = (props) => {
+  const { isLocked } = props;
+  const LockScreen = useModuleLoader(Bundles.Main, 'LockScreen', !isLocked);
+
+  // eslint-disable-next-line react/jsx-props-no-spreading
+  return LockScreen ? <LockScreen {...props} /> : undefined;
+};
+
+export default memo(LockScreenAsync);
--- a/src/components/main/LockScreen.module.scss
+++ b/src/components/main/LockScreen.module.scss
@ -0,0 +1,51 @@
+.container {
+  position: fixed;
+  left: 0;
+  top: 0;
+  right: 0;
+  bottom: 0;
+
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.wrapper {
+  display: inline-flex;
+  flex-direction: column;
+  background: var(--color-background);
+  color: var(--color-text);
+  max-width: 20rem;
+  padding: 1.5rem 1rem 0;
+  border-radius: var(--border-radius-default);
+  z-index: 2;
+
+  &[dir="rtl"] {
+    text-align: right;
+  }
+}
+
+.icon {
+  position: relative;
+  width: 10rem;
+  height: 10rem;
+  margin: 0 auto 1rem;
+}
+
+.iconAnimated,
+.iconStatic {
+  position: absolute;
+  left: 0;
+  top: 0;
+  width: 10rem;
+  height: 10rem;
+}
+
+.iconStatic {
+  background: url("../../assets/lock.png") no-repeat center;
+  background-size: contain;
+}
+
+.help {
+  margin-top: 2rem;
+}
--- a/src/components/main/LockScreen.tsx
+++ b/src/components/main/LockScreen.tsx
@ -0,0 +1,184 @@
+import type { FC } from '../../lib/teact/teact';
+import React, {
+  memo, useCallback, useEffect, useState,
+} from '../../lib/teact/teact';
+import { getActions, withGlobal } from '../../global';
+
+import type { GlobalState } from '../../global/types';
+
+import useLang from '../../hooks/useLang';
+import buildClassName from '../../util/buildClassName';
+import { decryptSession } from '../../util/passcode';
+import getAnimationData from '../common/helpers/animatedAssets';
+import useShowTransition from '../../hooks/useShowTransition';
+import useTimeout from '../../hooks/useTimeout';
+import useFlag from '../../hooks/useFlag';
+
+import AnimatedSticker from '../common/AnimatedSticker';
+import PasswordForm from '../common/PasswordForm';
+import ConfirmDialog from '../ui/ConfirmDialog';
+import Button from '../ui/Button';
+import Link from '../ui/Link';
+
+import styles from './LockScreen.module.scss';
+
+export type OwnProps = {
+  isLocked?: boolean;
+};
+
+type StateProps = {
+  passcodeSettings: GlobalState['passcode'];
+};
+
+const MAX_INVALID_ATTEMPTS = 5;
+const TIMEOUT_RESET_INVALID_ATTEMPTS_MS = 180000; // 3 minutes
+const ICON_SIZE = 160;
+
+const LockScreen: FC<OwnProps & StateProps> = ({
+  isLocked,
+  passcodeSettings,
+}) => {
+  const {
+    unlockScreen,
+    signOut,
+    logInvalidUnlockAttempt,
+    resetInvalidUnlockAttempts,
+  } = getActions();
+
+  const {
+    invalidAttemptsCount,
+    isLoading,
+  } = passcodeSettings;
+
+  const lang = useLang();
+  const [validationError, setValidationError] = useState<string>('');
+  const [shouldShowPasscode, setShouldShowPasscode] = useState(false);
+  const [isSignOutDialogOpen, openSignOutConfirmation, closeSignOutConfirmation] = useFlag(false);
+  const { transitionClassNames, shouldRender } = useShowTransition(isLocked);
+  const [animationData, setAnimationData] = useState<string>();
+  const [isAnimationLoaded, markAnimationLoaded] = useFlag();
+  const shouldRenderAnimated = Boolean(animationData);
+
+  useEffect(() => {
+    getAnimationData('Lock').then(setAnimationData);
+  }, []);
+
+  const { transitionClassNames: animatedClassNames } = useShowTransition(shouldRenderAnimated);
+  const { shouldRender: shouldRenderStatic, transitionClassNames: staticClassNames } = useShowTransition(
+    !isAnimationLoaded, undefined, true,
+  );
+
+  useTimeout(
+    resetInvalidUnlockAttempts,
+    invalidAttemptsCount && invalidAttemptsCount >= MAX_INVALID_ATTEMPTS
+      ? TIMEOUT_RESET_INVALID_ATTEMPTS_MS
+      : undefined,
+  );
+
+  const handleClearError = useCallback(() => {
+    setValidationError('');
+  }, []);
+
+  const handleSubmit = useCallback((passcode: string) => {
+    if (invalidAttemptsCount && invalidAttemptsCount >= MAX_INVALID_ATTEMPTS) {
+      setValidationError(lang('FloodWait'));
+      return;
+    }
+
+    setValidationError('');
+    decryptSession(passcode).then(unlockScreen, () => {
+      logInvalidUnlockAttempt();
+      setValidationError(lang('lng_passcode_wrong'));
+    });
+  }, [invalidAttemptsCount, lang, logInvalidUnlockAttempt, unlockScreen]);
+
+  useEffect(() => {
+    if (invalidAttemptsCount && invalidAttemptsCount >= MAX_INVALID_ATTEMPTS) {
+      setValidationError(lang('FloodWait'));
+    } else if (invalidAttemptsCount === 0) {
+      setValidationError('');
+    }
+  }, [invalidAttemptsCount, lang]);
+
+  const handleSignOutMessage = useCallback(() => {
+    closeSignOutConfirmation();
+    signOut();
+  }, [closeSignOutConfirmation, signOut]);
+
+  if (!shouldRender) {
+    return undefined;
+  }
+
+  function renderLogoutPrompt() {
+    return (
+      <div className={styles.help}>
+        <p>
+          <Link onClick={openSignOutConfirmation}>Log out</Link>{' '}
+          if you don&apos;t remember your passcode.
+        </p>
+        <p>
+          <Button color="translucent" size="tiny" isText onClick={openSignOutConfirmation}>
+            {lang('AccountSettings.Logout')}
+          </Button>
+        </p>
+      </div>
+    );
+  }
+
+  return (
+    <div className={buildClassName(styles.container, transitionClassNames)}>
+      <div className={styles.wrapper} dir={lang.isRtl ? 'rtl' : undefined}>
+        <div className={styles.icon}>
+          {shouldRenderStatic && (
+            <div className={buildClassName(styles.iconStatic, staticClassNames)} />
+          )}
+          {shouldRenderAnimated && (
+            <AnimatedSticker
+              id="lock_screen_icon"
+              animationData={animationData}
+              className={buildClassName(styles.iconAnimated, animatedClassNames)}
+              play
+              noLoop
+              size={ICON_SIZE}
+              onLoad={markAnimationLoaded}
+            />
+          )}
+        </div>
+
+        <PasswordForm
+          key="password-form"
+          shouldShowSubmit
+          shouldDisablePasswordManager
+          isLoading={isLoading}
+          error={validationError}
+          placeholder={lang('Passcode.EnterPasscodePlaceholder')}
+          submitLabel={lang('Next')}
+          clearError={handleClearError}
+          isPasswordVisible={shouldShowPasscode}
+          noRipple
+          onChangePasswordVisibility={setShouldShowPasscode}
+          onSubmit={handleSubmit}
+        />
+
+        {renderLogoutPrompt()}
+      </div>
+
+      <ConfirmDialog
+        isOpen={isSignOutDialogOpen}
+        onClose={closeSignOutConfirmation}
+        text={lang('lng_sure_logout')}
+        confirmLabel={lang('AccountSettings.Logout')}
+        confirmHandler={handleSignOutMessage}
+        confirmIsDestructive
+      />
+    </div>
+  );
+};
+
+export default memo(withGlobal<OwnProps>(
+  (global): StateProps => {
+    return {
+      passcodeSettings: global.passcode,
+    };
+  },
+)(LockScreen));
--- a/src/components/main/Main.scss
+++ b/src/components/main/Main.scss
@ -33,6 +33,7 @@
  max-width: 26.5rem;
  height: 100%;
  position: relative;
+  background-color: var(--color-background);

  & > div {
    height: 100%;
--- a/src/components/main/Main.tsx
+++ b/src/components/main/Main.tsx
@ -356,7 +356,6 @@ const Main: FC<StateProps> = ({
  // Online status and browser tab indicators
  useBackgroundMode(handleBlur, handleFocus);
  useBeforeUnload(handleBlur);
-
  usePreventPinchZoomGesture(isMediaViewerOpen);

  return (
@ -419,7 +418,13 @@ function updatePageTitle(nextTitle: string) {

 export default memo(withGlobal(
  (global): StateProps => {
-    const { settings: { byKey: { animationLevel, language, wasTimeFormatSetManually } } } = global;
+    const {
+      settings: {
+        byKey: {
+          animationLevel, language, wasTimeFormatSetManually,
+        },
+      },
+    } = global;
    const { chatId: audioChatId, messageId: audioMessageId } = global.audioPlayer;
    const audioMessage = audioChatId && audioMessageId
      ? selectChatMessage(global, audioChatId, audioMessageId)
--- a/src/components/middle/HeaderActions.tsx
+++ b/src/components/middle/HeaderActions.tsx
@ -153,7 +153,7 @@ const HeaderActions: FC<OwnProps & StateProps> = ({
  }, [canSearch, handleSearchClick]);

  useHotkeys({
-    'meta+F': handleHotkeySearchClick,
+    'Meta+F': handleHotkeySearchClick,
  });

  const lang = useLang();
--- a/src/components/middle/MiddleColumn.module.scss
+++ b/src/components/middle/MiddleColumn.module.scss
@ -1,10 +1,13 @@
-.bg-layers {
+.background {
+  position: absolute;
+  top: 0;
+  left: 0;
+  bottom: 0;
+  right: 0;
+  z-index: -1;
+  overflow: hidden;
  background-color: var(--theme-background-color);

-  body:not(.animation-level-0) &.with-transition {
-    transition: background-color 0.2s;
-  }
-
  &::before {
    content: "";
    position: absolute;
@ -17,67 +20,70 @@
    background-size: cover;
  }

-  html.theme-light &:not(.custom-bg-image)::before {
-    background-image: url('../assets/chat-bg-br.png');
+  :global(html.theme-light) &:not(.customBgImage)::before {
+    background-image: url('../../assets/chat-bg-br.png');
  }

-  &:not(.custom-bg-image).custom-bg-color::before {
+  &:not(.customBgImage).customBgColor::before {
    display: none;
  }

-  &.custom-bg-image::before {
+  &.customBgImage::before {
    background-image: var(--custom-background) !important;
    transform: scale(1.1);
  }

-  body:not(.animation-level-0) &.custom-bg-image.with-transition::before {
-    transition: background-image var(--layer-transition);
+  :global(body:not(.animation-level-0)) &.withTransition {
+    transition: background-color 0.2s;
+
+    &.customBgImage::before {
+      transition: background-image var(--layer-transition);
+    }
  }

-  &.custom-bg-image.blurred::before {
+  &.customBgImage.blurred::before {
    filter: blur(12px);
  }

  @media screen and (min-width: 1276px) {
-    body.animation-level-2 &::before {
+    :global(body.animation-level-2) &:not(.customBgImage)::before {
      overflow: hidden;
      transform: scale(1);
      transform-origin: left center;
    }
  }

-  html.theme-light body.animation-level-2 &:not(.custom-bg-image).with-right-column::before {
-    transition: transform var(--layer-transition);
-
+  :global(html.theme-light body.animation-level-2) &:not(.customBgImage).withRightColumn::before {
    @media screen and (min-width: 1276px) {
      transform: scaleX(0.67) !important;
    }
-
    @media screen and (min-width: 1921px) {
      transform: scaleX(0.8) !important;
    }
-
    @media screen and (min-width: 2600px) {
      transform: scaleX(0.95) !important;
    }
  }

-  &:not(.custom-bg-image):not(.custom-bg-color)::after {
+  :global(html.theme-light body.animation-level-2) &:not(.customBgImage).withRightColumn.withTransition::before {
+    transition: transform var(--layer-transition);
+  }
+
+  &:not(.customBgImage):not(.customBgColor)::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
-    z-index: 1;
-    background-image: url('../assets/chat-bg-pattern-light.png');
-    background-position: top left;
+    background-image: url('../../assets/chat-bg-pattern-light.png');
+    background-position: top right;
    background-size: 510px auto;
    background-repeat: repeat;
    mix-blend-mode: overlay;

-    html.theme-dark & {
-      background-image: url('../assets/chat-bg-pattern-dark.png');
+    :global(html.theme-dark) & {
+      background-image: url('../../assets/chat-bg-pattern-dark.png');
      mix-blend-mode: unset;
    }
  }
--- a/src/components/middle/MiddleColumn.scss
+++ b/src/components/middle/MiddleColumn.scss
@ -1,13 +1,3 @@
-#middle-column-bg {
-  position: absolute;
-  top: 0;
-  left: 0;
-  bottom: 0;
-  right: 0;
-  overflow: hidden;
-  z-index: -1;
-}
-
 #MiddleColumn {
  display: flex;
  justify-content: center;
--- a/src/components/middle/MiddleColumn.tsx
+++ b/src/components/middle/MiddleColumn.tsx
@ -75,6 +75,7 @@ import EmojiInteractionAnimation from './EmojiInteractionAnimation.async';
 import ReactorListModal from './ReactorListModal.async';

 import './MiddleColumn.scss';
+import styles from './MiddleColumn.module.scss';

 type StateProps = {
  chatId?: string;
@ -319,11 +320,12 @@ const MiddleColumn: FC<StateProps> = ({
  );

  const bgClassName = buildClassName(
-    'bg-layers with-transition',
-    customBackground && 'custom-bg-image',
-    backgroundColor && 'custom-bg-color',
-    customBackground && isBackgroundBlurred && 'blurred',
-    isRightColumnShown && 'with-right-column',
+    styles.background,
+    styles.withTransition,
+    customBackground && styles.customBgImage,
+    backgroundColor && styles.customBgColor,
+    customBackground && isBackgroundBlurred && styles.blurred,
+    isRightColumnShown && styles.withRightColumn,
  );

  const messagingDisabledClassName = buildClassName(
@ -389,7 +391,6 @@ const MiddleColumn: FC<StateProps> = ({
      onClick={(IS_TABLET_COLUMN_LAYOUT && isLeftColumnShown) ? handleTabletFocus : undefined}
    >
      <div
-        id="middle-column-bg"
        className={bgClassName}
        style={customBackgroundValue ? `--custom-background: ${customBackgroundValue}` : undefined}
      />
--- a/src/components/middle/hooks/useCopySelectedMessages.ts
+++ b/src/components/middle/hooks/useCopySelectedMessages.ts
@ -10,7 +10,7 @@ const useCopySelectedMessages = (isActive: boolean, copySelectedMessages: NoneTo
    copySelectedMessages();
  }

-  useHotkeys({ 'meta+C': handleCopy });
+  useHotkeys({ 'Meta+C': handleCopy });
 };

 export default useCopySelectedMessages;
--- a/src/components/right/RightColumn.tsx
+++ b/src/components/right/RightColumn.tsx
@ -319,7 +319,10 @@ const RightColumn: FC<StateProps> = ({
          renderCount={MAIN_SCREENS_COUNT + MANAGEMENT_SCREENS_COUNT}
          activeKey={isManagement ? MAIN_SCREENS_COUNT + managementScreen : renderingContentKey}
          shouldCleanup
-          cleanupExceptionKey={renderingContentKey === RightColumnContent.MessageStatistics ? RightColumnContent.Statistics : undefined}
+          cleanupExceptionKey={
+            renderingContentKey === RightColumnContent.MessageStatistics
+              ? RightColumnContent.Statistics : undefined
+          }
        >
          {renderContent}
        </Transition>
--- a/src/components/ui/Button.tsx
+++ b/src/components/ui/Button.tsx
@ -4,6 +4,7 @@ import type { FC } from '../../lib/teact/teact';
 import React, { useRef, useCallback, useState } from '../../lib/teact/teact';

 import buildClassName from '../../util/buildClassName';
+import buildStyle from '../../util/buildStyle';

 import Spinner from './Spinner';
 import RippleEffect from './RippleEffect';
@ -171,7 +172,7 @@ const Button: FC<OwnProps> = ({
      title={ariaLabel}
      tabIndex={tabIndex}
      dir={isRtl ? 'rtl' : undefined}
-      style={backgroundImage ? `background-image: url(${backgroundImage})` : style}
+      style={buildStyle(backgroundImage && `background-image: url(${backgroundImage})`)}
    >
      {isLoading ? (
        <div>
--- a/src/components/ui/InfiniteScroll.tsx
+++ b/src/components/ui/InfiniteScroll.tsx
@ -9,6 +9,7 @@ import React, {
 import { debounce } from '../../util/schedulers';
 import resetScroll from '../../util/resetScroll';
 import { IS_ANDROID } from '../../util/environment';
+import buildStyle from '../../util/buildStyle';

 type OwnProps = {
  ref?: RefObject<HTMLDivElement>;
@ -226,7 +227,7 @@ const InfiniteScroll: FC<OwnProps> = ({
      {withAbsolutePositioning && items?.length ? (
        <div
          teactFastList={!noFastList}
-          style={`position: relative;${IS_ANDROID ? ` height: ${maxHeight}px;` : undefined}`}
+          style={buildStyle('position: relative', IS_ANDROID && `height: ${maxHeight}px`)}
        >
          {children}
        </div>
--- a/src/components/ui/Menu.tsx
+++ b/src/components/ui/Menu.tsx
@ -8,6 +8,7 @@ import useVirtualBackdrop from '../../hooks/useVirtualBackdrop';
 import useEffectWithPrevDeps from '../../hooks/useEffectWithPrevDeps';
 import captureEscKeyListener from '../../util/captureEscKeyListener';
 import buildClassName from '../../util/buildClassName';
+import buildStyle from '../../util/buildStyle';
 import { dispatchHeavyAnimationEvent } from '../../hooks/useHeavyAnimationCheck';
 import useHistoryBack from '../../hooks/useHistoryBack';
 import { preventMessageInputBlurWithBubbling } from '../middle/helpers/preventMessageInputBlur';
@ -143,8 +144,10 @@ const Menu: FC<OwnProps> = ({
      <div
        ref={menuRef}
        className={bubbleClassName}
-        style={`transform-origin: ${transformOriginXStyle || positionX} ${transformOriginYStyle || positionY};${
-          bubbleStyle || ''}`}
+        style={buildStyle(
+          `transform-origin: ${transformOriginXStyle || positionX} ${transformOriginYStyle || positionY}`,
+          bubbleStyle,
+        )}
        onClick={autoClose ? onClose : undefined}
      >
        {children}
--- a/src/components/ui/MenuItem.scss
+++ b/src/components/ui/MenuItem.scss
@ -69,10 +69,18 @@
    transition: none !important;
  }

-  & > .Switcher {
+  .Switcher, .menu-item-badge {
    margin-left: auto;
  }

+  .menu-item-badge {
+    margin-right: 0.25rem;
+    font-size: 0.75rem;
+    color: var(--color-primary);
+    font-weight: normal;
+    line-height: normal;
+  }
+
  &[dir="rtl"] {
    i {
      margin-left: 2rem;
--- a/src/components/ui/Modal.scss
+++ b/src/components/ui/Modal.scss
@ -2,6 +2,10 @@
  position: relative;
  z-index: var(--z-modal);

+  &.confirm {
+    z-index: var(--z-lock-screen);
+  }
+
  &.delete,
  &.error,
  &.confirm,
--- a/src/config.ts
+++ b/src/config.ts
@ -23,6 +23,7 @@ export const DEBUG_PAYMENT_SMART_GLOCAL = false;

 export const SESSION_USER_KEY = 'user_auth';
 export const LEGACY_SESSION_KEY = 'GramJs:sessionId';
+export const PASSCODE_CACHE_NAME = 'tt-passcode';

 export const GLOBAL_STATE_CACHE_DISABLED = false;
 export const GLOBAL_STATE_CACHE_KEY = 'tt-global-state';
@ -122,6 +123,8 @@ export const API_THROTTLE_RESET_UPDATES = new Set([
  'newMessage', 'newScheduledMessage', 'deleteMessages', 'deleteScheduledMessages', 'deleteHistory',
 ]);

+export const LOCK_SCREEN_ANIMATION_DURATION_MS = 200;
+
 export const STICKER_SIZE_INLINE_DESKTOP_FACTOR = 13;
 export const STICKER_SIZE_INLINE_MOBILE_FACTOR = 11;
 export const STICKER_SIZE_AUTH = 160;
@ -132,6 +135,7 @@ export const STICKER_SIZE_PICKER_HEADER = 32;
 export const STICKER_SIZE_SEARCH = 64;
 export const STICKER_SIZE_MODAL = 64;
 export const STICKER_SIZE_TWO_FA = 160;
+export const STICKER_SIZE_PASSCODE = 160;
 export const STICKER_SIZE_DISCUSSION_GROUPS = 140;
 export const STICKER_SIZE_FOLDER_SETTINGS = 100;
 export const STICKER_SIZE_INLINE_BOT_RESULT = 100;
--- a/src/global/actions/all.ts
+++ b/src/global/actions/all.ts
@ -10,6 +10,7 @@ import './ui/misc';
 import './ui/payments';
 import './ui/calls';
 import './ui/mediaViewer';
+import './ui/passcode';

 import './api/initial';
 import './api/chats';
--- a/src/global/actions/api/initial.ts
+++ b/src/global/actions/api/initial.ts
@ -11,6 +11,7 @@ import {
  MEDIA_CACHE_NAME_AVATARS,
  MEDIA_PROGRESSIVE_CACHE_NAME,
  IS_TEST,
+  LOCK_SCREEN_ANIMATION_DURATION_MS,
 } from '../../../config';
 import { IS_MOV_SUPPORTED, IS_WEBM_SUPPORTED, PLATFORM_ENV } from '../../../util/environment';
 import { unsubscribe } from '../../../util/notifications';
@ -24,6 +25,9 @@ import {
  clearLegacySessions,
 } from '../../../util/sessions';
 import { forceWebsync } from '../../../util/websync';
+import { clearGlobalForLockScreen, updatePasscodeSettings } from '../../reducers';
+import { clearEncryptedSession, encryptSession, forgetPasscode } from '../../../util/passcode';
+import { serializeGlobal } from '../../cache';

 addActionHandler('initApi', async (global, actions) => {
  if (!IS_TEST) {
@ -142,6 +146,7 @@ addActionHandler('signOut', async (_global, _actions, payload) => {

 addActionHandler('reset', () => {
  clearStoredSession();
+  clearEncryptedSession();

  void cacheApi.clear(MEDIA_CACHE_NAME);
  void cacheApi.clear(MEDIA_CACHE_NAME_AVATARS);
@ -161,6 +166,18 @@ addActionHandler('reset', () => {
  getActions().init();
 });

+addActionHandler('softReset', () => {
+  clearStoredSession();
+
+  void clearLegacySessions();
+
+  updateAppBadge(0);
+
+  let global = getGlobal();
+  global = clearGlobalForLockScreen(global);
+  setGlobal(global);
+});
+
 addActionHandler('disconnect', () => {
  void callApi('disconnect');
 });
@ -194,3 +211,29 @@ addActionHandler('deleteDeviceToken', (global) => {
    push: undefined,
  };
 });
+
+addActionHandler('lockScreen', async (global, { softReset }) => {
+  const sessionJson = JSON.stringify({ ...loadStoredSession(), userId: global.currentUserId });
+  const globalJson = serializeGlobal();
+
+  await encryptSession(sessionJson, globalJson);
+  forgetPasscode();
+
+  global = getGlobal();
+  setGlobal(updatePasscodeSettings(
+    global,
+    {
+      isScreenLocked: true,
+      invalidAttemptsCount: 0,
+    },
+  ));
+
+  try {
+    await unsubscribe();
+    await callApi('destroy', true);
+  } catch (err) {
+    // Do nothing
+  }
+
+  setTimeout(() => softReset(), LOCK_SCREEN_ANIMATION_DURATION_MS);
+});
--- a/src/global/actions/ui/passcode.ts
+++ b/src/global/actions/ui/passcode.ts
@ -0,0 +1,69 @@
+import { addActionHandler, setGlobal, getGlobal } from '../../index';
+
+import { clearPasscodeSettings, updatePasscodeSettings } from '../../reducers';
+import { loadStoredSession, storeSession } from '../../../util/sessions';
+import { clearEncryptedSession, encryptSession, setupPasscode } from '../../../util/passcode';
+import { serializeGlobal } from '../../cache';
+
+addActionHandler('setPasscode', async (global, actions, { passcode }) => {
+  setGlobal(updatePasscodeSettings(global, {
+    isLoading: true,
+  }));
+  await setupPasscode(passcode);
+
+  const sessionJson = JSON.stringify({ ...loadStoredSession(), userId: global.currentUserId });
+  const globalJson = serializeGlobal();
+
+  await encryptSession(sessionJson, globalJson);
+
+  setGlobal(updatePasscodeSettings(getGlobal(), {
+    hasPasscode: true,
+    error: undefined,
+    isLoading: false,
+  }));
+});
+
+addActionHandler('clearPasscode', (global) => {
+  void clearEncryptedSession();
+
+  return clearPasscodeSettings(global);
+});
+
+addActionHandler('unlockScreen', (global, actions, { sessionJson, globalJson }) => {
+  const session = JSON.parse(sessionJson);
+  storeSession(session, session.userId);
+
+  global = JSON.parse(globalJson);
+  setGlobal(updatePasscodeSettings(
+    global,
+    {
+      isScreenLocked: false,
+      error: undefined,
+      invalidAttemptsCount: 0,
+    },
+  ));
+
+  actions.initApi();
+});
+
+addActionHandler('logInvalidUnlockAttempt', (global) => {
+  return updatePasscodeSettings(global, {
+    invalidAttemptsCount: (global.passcode?.invalidAttemptsCount ?? 0) + 1,
+  });
+});
+
+addActionHandler('resetInvalidUnlockAttempts', (global) => {
+  return updatePasscodeSettings(global, {
+    invalidAttemptsCount: 0,
+  });
+});
+
+addActionHandler('setPasscodeError', (global, actions, payload) => {
+  const { error } = payload;
+
+  return updatePasscodeSettings(global, { error });
+});
+
+addActionHandler('clearPasscodeError', (global) => {
+  return updatePasscodeSettings(global, { error: undefined });
+});
--- a/src/global/actions/ui/settings.ts
+++ b/src/global/actions/ui/settings.ts
@ -11,3 +11,13 @@ addActionHandler('setThemeSettings', (global, actions, payload: { theme: ThemeKe

  return replaceThemeSettings(global, theme, settings);
 });
+
+addActionHandler('requestNextSettingsScreen', (global, actions, nextScreen) => {
+  return {
+    ...global,
+    settings: {
+      ...global.settings,
+      nextScreen,
+    },
+  };
+});
--- a/src/global/cache.ts
+++ b/src/global/cache.ts
@ -27,11 +27,13 @@ import {
  selectCurrentMessageList,
  selectVisibleUsers,
 } from './selectors';
-import { hasStoredSession } from '../util/sessions';
+import { hasStoredSession, loadStoredSession } from '../util/sessions';
 import { INITIAL_STATE } from './initialState';
 import { parseLocationHash } from '../util/routing';
 import { isUserId } from './helpers';
 import { getOrderedIds } from '../util/folderManager';
+import { clearGlobalForLockScreen } from './reducers';
+import { encryptSession } from '../util/passcode';

 const UPDATE_THROTTLE = 5000;

@ -45,6 +47,16 @@ export function initCache() {
    return;
  }

+  const resetCache = () => {
+    localStorage.removeItem(GLOBAL_STATE_CACHE_KEY);
+
+    if (!isCaching) {
+      return;
+    }
+
+    clearCaching();
+  };
+
  addActionHandler('saveSession', () => {
    if (isCaching) {
      return;
@ -53,15 +65,7 @@ export function initCache() {
    setupCaching();
  });

-  addActionHandler('reset', () => {
-    localStorage.removeItem(GLOBAL_STATE_CACHE_KEY);
-
-    if (!isCaching) {
-      return;
-    }
-
-    clearCaching();
-  });
+  addActionHandler('reset', resetCache);
 }

 export function loadCache(initialState: GlobalState): GlobalState | undefined {
@ -236,6 +240,10 @@ function migrateCache(cached: GlobalState, initialState: GlobalState) {
    cached.trustedBotIds = [];
  }

+  if (!cached.passcode) {
+    cached.passcode = {};
+  }
+
  if (cached.activeSessions?.byHash === undefined) {
    cached.activeSessions = {
      byHash: {},
@ -245,16 +253,30 @@ function migrateCache(cached: GlobalState, initialState: GlobalState) {
 }

 function updateCache() {
-  if (!isCaching || isHeavyAnimating()) {
-    return;
-  }
-
  const global = getGlobal();
-
-  if (global.isLoggingOut) {
+  if (!isCaching || global.isLoggingOut || isHeavyAnimating()) {
    return;
  }

+  const { hasPasscode, isScreenLocked } = global.passcode;
+  const serializedGlobal = serializeGlobal();
+
+  if (hasPasscode) {
+    if (!isScreenLocked) {
+      const sessionJson = JSON.stringify({ ...loadStoredSession(), userId: global.currentUserId });
+      void encryptSession(sessionJson, serializedGlobal);
+    }
+
+    localStorage.setItem(GLOBAL_STATE_CACHE_KEY, JSON.stringify(clearGlobalForLockScreen(global)));
+
+    return;
+  }
+
+  localStorage.setItem(GLOBAL_STATE_CACHE_KEY, serializedGlobal);
+}
+
+export function serializeGlobal() {
+  const global = getGlobal();
  const reducedGlobal: GlobalState = {
    ...INITIAL_STATE,
    ...pick(global, [
@ -295,10 +317,14 @@ function updateCache() {
    availableReactions: reduceAvailableReactions(global),
    isCallPanelVisible: undefined,
    trustedBotIds: global.trustedBotIds,
+    passcode: pick(global.passcode, [
+      'isScreenLocked',
+      'hasPasscode',
+      'invalidAttemptsCount',
+    ]),
  };

-  const json = JSON.stringify(reducedGlobal);
-  localStorage.setItem(GLOBAL_STATE_CACHE_KEY, json);
+  return JSON.stringify(reducedGlobal);
 }

 function reduceShowChatInfo(global: GlobalState): boolean {
@ -352,7 +378,7 @@ function reduceChats(global: GlobalState): GlobalState['chats'] {
 function reduceMessages(global: GlobalState): GlobalState['messages'] {
  const { currentUserId } = global;
  const byChatId: GlobalState['messages']['byChatId'] = {};
-  const { chatId: currentChatId } = selectCurrentMessageList(global) || {};
+  const { chatId: currentChatId, threadId, type } = selectCurrentMessageList(global) || {};
  const chatIdsToSave = [
    ...currentChatId ? [currentChatId] : [],
    ...currentUserId ? [currentUserId] : [],
@ -380,7 +406,7 @@ function reduceMessages(global: GlobalState): GlobalState['messages'] {

  return {
    byChatId,
-    messageLists: [],
+    messageLists: currentChatId && threadId && type ? [{ chatId: currentChatId, threadId, type }] : [],
    sponsoredByChatId: {},
  };
 }
--- a/src/global/init.ts
+++ b/src/global/init.ts
@ -1,15 +1,24 @@
 import { addActionHandler } from './index';

 import { INITIAL_STATE } from './initialState';
+import { IS_MOCKED_CLIENT } from '../config';
 import { initCache, loadCache } from './cache';
 import { cloneDeep } from '../util/iteratees';
-import { IS_MOCKED_CLIENT } from '../config';
+import { updatePasscodeSettings } from './reducers';

 initCache();

 addActionHandler('init', () => {
  const initial = cloneDeep(INITIAL_STATE);
-  const state = loadCache(initial) || initial;
-  if (IS_MOCKED_CLIENT) state.authState = 'authorizationStateReady';
-  return state;
+  let global = loadCache(initial) || initial;
+  if (IS_MOCKED_CLIENT) global.authState = 'authorizationStateReady';
+
+  const { hasPasscode, isScreenLocked } = global.passcode;
+  if (hasPasscode && !isScreenLocked) {
+    global = updatePasscodeSettings(global, {
+      isScreenLocked: true,
+    });
+  }
+
+  return global;
 });
--- a/src/global/initialState.ts
+++ b/src/global/initialState.ts
@ -192,6 +192,7 @@ export const INITIAL_STATE: GlobalState = {
  },

  twoFaSettings: {},
+  passcode: {},
  activeReactions: {},

  shouldShowContextMenuHint: true,
--- a/src/global/reducers/index.ts
+++ b/src/global/reducers/index.ts
@ -7,5 +7,6 @@ export * from './localSearch';
 export * from './management';
 export * from './settings';
 export * from './twoFaSettings';
+export * from './passcode';
 export * from './payments';
 export * from './statistics';
--- a/src/global/reducers/passcode.ts
+++ b/src/global/reducers/passcode.ts
@ -0,0 +1,46 @@
+import type { GlobalState } from '../types';
+import { INITIAL_STATE } from '../initialState';
+
+export function updatePasscodeSettings(
+  global: GlobalState,
+  update: GlobalState['passcode'],
+): GlobalState {
+  return {
+    ...global,
+    passcode: {
+      ...global.passcode,
+      ...update,
+    },
+  };
+}
+
+export function clearPasscodeSettings(global: GlobalState): GlobalState {
+  return {
+    ...global,
+    passcode: {},
+  };
+}
+
+export function clearGlobalForLockScreen(global: GlobalState): GlobalState {
+  const {
+    theme,
+    shouldUseSystemTheme,
+    animationLevel,
+    language,
+  } = global.settings.byKey;
+
+  return {
+    ...INITIAL_STATE,
+    passcode: global.passcode,
+    settings: {
+      ...INITIAL_STATE.settings,
+      byKey: {
+        ...INITIAL_STATE.settings.byKey,
+        theme,
+        shouldUseSystemTheme,
+        animationLevel,
+        language,
+      },
+    },
+  };
+}
--- a/src/global/types.ts
+++ b/src/global/types.ts
@ -62,6 +62,7 @@ import type {
  NewChatMembersProgress,
  AudioOrigin,
  ManagementState,
+  SettingsScreens,
 } from '../types';
 import { typify } from '../lib/teact/teactn';
 import type { P2pMessage } from '../lib/secret-sauce';
@ -494,6 +495,7 @@ export type GlobalState = {
    themes: Partial<Record<ThemeKey, IThemeSettings>>;
    privacy: Partial<Record<ApiPrivacyKey, ApiPrivacySettings>>;
    notifyExceptions?: Record<number, NotifyException>;
+    nextScreen?: SettingsScreens;
  };

  twoFaSettings: {
@ -503,6 +505,14 @@ export type GlobalState = {
    waitingEmailCodeLength?: number;
  };

+  passcode: {
+    isScreenLocked?: boolean;
+    hasPasscode?: boolean;
+    error?: string;
+    invalidAttemptsCount?: number;
+    isLoading?: boolean;
+  };
+
  push?: {
    deviceToken: string;
    subscribedAt: number;
@ -861,6 +871,21 @@ export interface ActionPayloads {
    sound: CallSound;
  };
  connectToActivePhoneCall: {};
+
+  // Passcode
+  setPasscode: { passcode: string };
+  clearPasscode: never;
+  lockScreen: never;
+  unlockScreen: { sessionJson: string; globalJson: string };
+  softSignIn: never;
+  softReset: never;
+  logInvalidUnlockAttempt: never;
+  resetInvalidUnlockAttempts: never;
+  setPasscodeError: { error: string };
+  clearPasscodeError: never;
+
+  // Settings
+  requestNextSettingsScreen: SettingsScreens;
 }

 export type NonTypedActionNames = (
--- a/src/hooks/useNativeCopySelectedMessages.ts
+++ b/src/hooks/useNativeCopySelectedMessages.ts
@ -11,7 +11,7 @@ const useNativeCopySelectedMessages = (copyMessagesByIds: ({ messageIds }: { mes
    }
  }

-  useHotkeys({ 'meta+C': handleCopy });
+  useHotkeys({ 'Meta+C': handleCopy });
 };

 export default useNativeCopySelectedMessages;
--- a/src/index.tsx
+++ b/src/index.tsx
@ -38,7 +38,9 @@ if (DEBUG) {
  console.log('>>> FINISH INITIAL RENDER');
 }

-document.addEventListener('dblclick', () => {
-  // eslint-disable-next-line no-console
-  console.warn('GLOBAL STATE', getGlobal());
-});
+if (DEBUG) {
+  document.addEventListener('dblclick', () => {
+    // eslint-disable-next-line no-console
+    console.warn('GLOBAL STATE', getGlobal());
+  });
+}
--- a/src/styles/Telegram
+++ b/src/styles/Telegram
--- a/src/styles/_forms.scss
+++ b/src/styles/_forms.scss
@ -148,6 +148,26 @@
    box-shadow: inset 0 0 0 1px var(--color-text-green);
    caret-color: var(--color-text-green);
  }
+
+  // Disable yellow highlight on autofill
+  &:autofill,
+  &:-webkit-autofill-strong-password,
+  &:-webkit-autofill-strong-password-viewable,
+  &:-webkit-autofill-and-obscured {
+    box-shadow: inset 0 0 0 10rem var(--color-background);
+    -webkit-text-fill-color: var(--color-text);
+  }
+
+  // Hide hint for Safari password strength meter
+  &::-webkit-strong-password-auto-fill-button {
+    opacity: 0;
+    width: 0 !important;
+    overflow: hidden !important;
+    max-width: 0 !important;
+    min-width: 0 !important;
+    clip: rect(0, 0, 0, 0);
+    position: absolute;
+  }
 }

 select.form-control {
--- a/src/styles/_variables.scss
+++ b/src/styles/_variables.scss
@ -199,6 +199,7 @@ $color-message-reaction-own-hover: #b5e0a4;
    --symbol-menu-height: 14.6875rem;
  }

+  --z-lock-screen: 3000;
  --z-ui-loader-mask: 2000;
  --z-notification: 1520;
  --z-right-column: 900;
--- a/src/styles/icons.scss
+++ b/src/styles/icons.scss
@ -51,6 +51,9 @@
 .icon-volume-3:before {
  content: "\e991";
 }
+.icon-key:before {
+  content: "\e99a";
+}
 .icon-heart-outline:before {
  content: "\e99e";
 }
--- a/src/styles/index.scss
+++ b/src/styles/index.scss
@ -5,7 +5,6 @@
@import "forms";
@import "icons";
@import "common";
-@import "bg";
@import "../assets/fonts/roboto.css";
@import "./print";

@ -66,12 +65,17 @@ body.cursor-ew-resize {
  cursor: ew-resize !important;
 }

-#root {
+#root,
+.full-height {
  height: 100%;

  @media (max-width: 600px) {
    height: calc(var(--vh, 1vh) * 100);
  }
+
+  &.is-auth {
+    background: var(--color-background);
+  }
 }

 #middle-column-portals,
--- a/src/styles/print.scss
+++ b/src/styles/print.scss
@ -12,7 +12,6 @@
  .Modal,
  .ActiveCallHeader,
  .unread-count,
-  #middle-column-bg,
  #middle-column-portals,
  .header-tools,
  .ScrollDownButton,
--- a/src/types/index.ts
+++ b/src/types/index.ts
@ -214,6 +214,15 @@ export enum SettingsScreens {
  TwoFaRecoveryEmailCode,
  TwoFaCongratulations,
  QuickReaction,
+  PasscodeDisabled,
+  PasscodeNewPasscode,
+  PasscodeNewPasscodeConfirm,
+  PasscodeEnabled,
+  PasscodeChangePasscodeCurrent,
+  PasscodeChangePasscodeNew,
+  PasscodeChangePasscodeConfirm,
+  PasscodeTurnOff,
+  PasscodeCongratulations,
 }

 export type StickerSetOrRecent = Pick<ApiStickerSet, (
--- a/src/util/cacheApi.ts
+++ b/src/util/cacheApi.ts
@ -5,6 +5,7 @@ export enum Type {
  Text,
  Blob,
  Json,
+  ArrayBuffer,
 }

 export async function fetch(
@ -52,6 +53,8 @@ export async function fetch(
      }
      case Type.Json:
        return await response.json();
+      case Type.ArrayBuffer:
+        return await response.arrayBuffer();
      default:
        return undefined;
    }
@ -62,13 +65,15 @@ export async function fetch(
  }
 }

-export async function save(cacheName: string, key: string, data: AnyLiteral | Blob | string) {
+export async function save(cacheName: string, key: string, data: AnyLiteral | Blob | ArrayBuffer | string) {
  if (!cacheApi) {
    return undefined;
  }

  try {
-    const cacheData = typeof data === 'string' || data instanceof Blob ? data : JSON.stringify(data);
+    const cacheData = typeof data === 'string' || data instanceof Blob || data instanceof ArrayBuffer
+      ? data
+      : JSON.stringify(data);
    // To avoid the error "Request scheme 'webdocument' is unsupported"
    const request = new Request(key.replace(/:/g, '_'));
    const response = new Response(cacheData);
@ -81,6 +86,21 @@ export async function save(cacheName: string, key: string, data: AnyLiteral | Bl
  }
 }

+export async function remove(cacheName: string, key: string) {
+  try {
+    if (!cacheApi) {
+      return undefined;
+    }
+
+    const cache = await cacheApi.open(cacheName);
+    return await cache.delete(key);
+  } catch (err) {
+    // eslint-disable-next-line no-console
+    console.warn(err);
+    return undefined;
+  }
+}
+
 export async function clear(cacheName: string) {
  try {
    if (!cacheApi) {
--- a/src/util/notifications.ts
+++ b/src/util/notifications.ts
@ -4,7 +4,7 @@ import type {
 } from '../api/types';
 import { ApiMediaFormat } from '../api/types';
 import { renderActionMessageText } from '../components/common/helpers/renderActionMessageText';
-import { DEBUG, IS_TEST } from '../config';
+import { APP_NAME, DEBUG, IS_TEST } from '../config';
 import { getActions, getGlobal, setGlobal } from '../global';
 import {
  getChatAvatarHash,
@ -275,6 +275,7 @@ function getNotificationContent(chat: ApiChat, message: ApiMessage, reaction?: A
  } = message;
  if (reaction) senderId = reaction.userId;

+  const { isScreenLocked } = global.passcode;
  const messageSender = senderId ? selectUser(global, senderId) : undefined;
  const messageAction = getMessageAction(message as ApiMessage);
  const actionTargetMessage = messageAction && replyToMessageId
@ -293,7 +294,10 @@ function getNotificationContent(chat: ApiChat, message: ApiMessage, reaction?: A
  const privateChatUser = privateChatUserId ? selectUser(global, privateChatUserId) : undefined;

  let body: string;
-  if (selectShouldShowMessagePreview(chat, selectNotifySettings(global), selectNotifyExceptions(global))) {
+  if (
+    !isScreenLocked
+    && selectShouldShowMessagePreview(chat, selectNotifySettings(global), selectNotifyExceptions(global))
+  ) {
    if (isActionMessage(message)) {
      const isChat = chat && (isChatChannel(chat) || message.senderId === message.chatId);

@ -318,7 +322,7 @@ function getNotificationContent(chat: ApiChat, message: ApiMessage, reaction?: A
  }

  return {
-    title: getChatTitle(getTranslation, chat, privateChatUser),
+    title: isScreenLocked ? APP_NAME : getChatTitle(getTranslation, chat, privateChatUser),
    body,
  };
 }
--- a/src/util/passcode.ts
+++ b/src/util/passcode.ts
@ -0,0 +1,94 @@
+import * as cacheApi from './cacheApi';
+import { PASSCODE_CACHE_NAME } from '../config';
+
+const IV_LENGTH = 12;
+const SALT = 'harder better faster stronger';
+
+let currentPasscodeHash: ArrayBuffer | undefined;
+
+export async function setupPasscode(passcode: string) {
+  currentPasscodeHash = await sha256(passcode);
+}
+
+export async function encryptSession(sessionJson: string, globalJson: string) {
+  if (!currentPasscodeHash) {
+    throw new Error('[api/passcode] Missing current passcode');
+  }
+
+  const [sessionEncrypted, globalEncrypted] = await Promise.all([
+    aesEncrypt(sessionJson, currentPasscodeHash),
+    aesEncrypt(globalJson, currentPasscodeHash),
+  ]);
+
+  await Promise.all([
+    store('sessionEncrypted', sessionEncrypted),
+    store('globalEncrypted', globalEncrypted),
+  ]);
+}
+
+export async function decryptSession(passcode: string) {
+  const passcodeHash = await sha256(passcode);
+
+  const [sessionEncrypted, globalEncrypted] = await Promise.all([
+    load('sessionEncrypted'),
+    load('globalEncrypted'),
+  ]);
+
+  if (!sessionEncrypted || !globalEncrypted) {
+    throw new Error('[api/passcode] Missing required stored fields');
+  }
+
+  const [sessionJson, globalJson] = await Promise.all([
+    aesDecrypt(sessionEncrypted, passcodeHash),
+    aesDecrypt(globalEncrypted, passcodeHash),
+  ]);
+
+  currentPasscodeHash = passcodeHash;
+
+  return { sessionJson, globalJson };
+}
+
+export function forgetPasscode() {
+  currentPasscodeHash = undefined;
+}
+
+export function clearEncryptedSession() {
+  forgetPasscode();
+  return cacheApi.clear(PASSCODE_CACHE_NAME);
+}
+
+function sha256(plaintext: string) {
+  return crypto.subtle.digest('SHA-256', new TextEncoder().encode(`${plaintext}${SALT}`));
+}
+
+async function store(key: string, value: ArrayBuffer) {
+  await cacheApi.save(PASSCODE_CACHE_NAME, key, value);
+}
+
+function load(key: string) {
+  return cacheApi.fetch(PASSCODE_CACHE_NAME, key, cacheApi.Type.ArrayBuffer);
+}
+
+async function aesEncrypt(plaintext: string, pwHash: ArrayBuffer) {
+  const iv = crypto.getRandomValues(new Uint8Array(IV_LENGTH));
+  const alg = { name: 'AES-GCM', iv };
+  const key = await crypto.subtle.importKey('raw', pwHash, alg, false, ['encrypt']);
+  const ptUint8 = new TextEncoder().encode(plaintext);
+  const ctBuffer = await crypto.subtle.encrypt(alg, key, ptUint8);
+  const ct = new Uint8Array(ctBuffer);
+  const result = new Uint8Array(IV_LENGTH + ct.length);
+  result.set(iv, 0);
+  result.set(ct, IV_LENGTH);
+  return result.buffer;
+}
+
+async function aesDecrypt(data: ArrayBuffer, pwHash: ArrayBuffer) {
+  const dataArray = new Uint8Array(data);
+  const iv = dataArray.slice(0, IV_LENGTH);
+  const alg = { name: 'AES-GCM', iv };
+  const key = await crypto.subtle.importKey('raw', pwHash, alg, false, ['decrypt']);
+  const ct = dataArray.slice(IV_LENGTH);
+  const plainBuffer = await crypto.subtle.decrypt(alg, key, ct);
+
+  return new TextDecoder().decode(plainBuffer);
+}
--- a/src/util/sessions.ts
+++ b/src/util/sessions.ts
@ -2,7 +2,9 @@ import * as idb from 'idb-keyval';

 import type { ApiSessionData } from '../api/types';

-import { DEBUG, LEGACY_SESSION_KEY, SESSION_USER_KEY } from '../config';
+import {
+  DEBUG, GLOBAL_STATE_CACHE_KEY, LEGACY_SESSION_KEY, SESSION_USER_KEY,
+} from '../config';
 import * as cacheApi from './cacheApi';

 const DC_IDS = [1, 2, 3, 4, 5];
@ -12,8 +14,14 @@ export function hasStoredSession(withLegacy = false) {
    return true;
  }

+  if (checkSessionLocked()) {
+    return true;
+  }
+
  const userAuthJson = localStorage.getItem(SESSION_USER_KEY);
-  if (!userAuthJson) return false;
+  if (!userAuthJson) {
+    return false;
+  }

  try {
    const userAuth = JSON.parse(userAuthJson);
@ -57,6 +65,9 @@ export function loadStoredSession(): ApiSessionData | undefined {
  }

  const userAuth = JSON.parse(localStorage.getItem(SESSION_USER_KEY)!);
+  if (!userAuth) {
+    return undefined;
+  }
  const mainDcId = Number(userAuth.dcID);
  const keys: Record<number, string> = {};
  const hashes: Record<number, string> = {};
@ -134,3 +145,9 @@ export function importTestSession() {
    // Do nothing.
  }
 }
+
+function checkSessionLocked() {
+  const stateFromCache = JSON.parse(localStorage.getItem(GLOBAL_STATE_CACHE_KEY) || '{}');
+
+  return Boolean(stateFromCache?.passcode?.isScreenLocked);
+}
--- a/src/util/switchTheme.ts
+++ b/src/util/switchTheme.ts
@ -32,6 +32,10 @@ const colors = (Object.keys(themeColors) as Array<keyof typeof themeColors>).map
 }));

 const switchTheme = (theme: ISettings['theme'], withAnimation: boolean) => {
+  const themeClassName = `theme-${theme}`;
+  if (document.documentElement.classList.contains(themeClassName)) {
+    return;
+  }
  const isDarkTheme = theme === 'dark';
  const shouldAnimate = isInitialized && withAnimation;
  const startIndex = isDarkTheme ? 0 : 1;
@ -43,7 +47,7 @@ const switchTheme = (theme: ISettings['theme'], withAnimation: boolean) => {
  if (isInitialized) {
    document.documentElement.classList.add('no-animations');
  }
-  document.documentElement.classList.add(`theme-${theme}`);
+  document.documentElement.classList.add(themeClassName);
  if (themeColorTag) {
    themeColorTag.setAttribute('content', isDarkTheme ? '#212121' : '#fff');
  }
--- a/webpack.config.js
+++ b/webpack.config.js
@ -51,6 +51,7 @@ module.exports = (env = {}, argv = {}) => {
        stats: 'minimal',
      },
    },
+
    output: {
      filename: '[name].[contenthash].js',
      chunkFilename: '[id].[chunkhash].js',