signal-desktop/preload.js

/* global Whisper, window */

const electron = require('electron');
const semver = require('semver');
const curve = require('curve25519-n');

const { deferredToPromise } = require('./js/modules/deferred_to_promise');

const { remote } = electron;
const { app } = remote;
const { systemPreferences } = remote.require('electron');

const browserWindow = remote.getCurrentWindow();
window.isFocused = () => browserWindow.isFocused();

// Waiting for clients to implement changes on receive side
window.ENABLE_STICKER_SEND = true;
window.TIMESTAMP_VALIDATION = false;
window.PAD_ALL_ATTACHMENTS = false;
window.SEND_RECIPIENT_UPDATES = false;

window.PROTO_ROOT = 'protos';
const config = require('url').parse(window.location.toString(), true).query;

let title = config.name;
if (config.environment !== 'production') {
  title += ` - ${config.environment}`;
}
if (config.appInstance) {
  title += ` - ${config.appInstance}`;
}

window.platform = process.platform;
window.getTitle = () => title;
window.getEnvironment = () => config.environment;
window.getAppInstance = () => config.appInstance;
window.getVersion = () => config.version;
window.isImportMode = () => config.importMode;
window.getExpiration = () => config.buildExpiration;
window.getNodeVersion = () => config.node_version;
window.getHostName = () => config.hostname;
window.getServerTrustRoot = () => config.serverTrustRoot;
window.isBehindProxy = () => Boolean(config.proxyUrl);

function setSystemTheme() {
  window.systemTheme = systemPreferences.isDarkMode() ? 'dark' : 'light';
}

setSystemTheme();

window.subscribeToSystemThemeChange = fn => {
  if (!systemPreferences.subscribeNotification) {
    return;
  }
  systemPreferences.subscribeNotification(
    'AppleInterfaceThemeChangedNotification',
    () => {
      setSystemTheme();
      fn();
    }
  );
};

window.isBeforeVersion = (toCheck, baseVersion) => {
  try {
    return semver.lt(toCheck, baseVersion);
  } catch (error) {
    window.log.error(
      `isBeforeVersion error: toCheck: ${toCheck}, baseVersion: ${baseVersion}`,
      error && error.stack ? error.stack : error
    );
    return true;
  }
};

window.wrapDeferred = deferredToPromise;

const ipc = electron.ipcRenderer;
const localeMessages = ipc.sendSync('locale-data');

window.setBadgeCount = count => ipc.send('set-badge-count', count);

// We never do these in our code, so we'll prevent it everywhere
window.open = () => null;
// eslint-disable-next-line no-eval, no-multi-assign
window.eval = global.eval = () => null;

window.drawAttention = () => {
  window.log.info('draw attention');
  ipc.send('draw-attention');
};
window.showWindow = () => {
  window.log.info('show window');
  ipc.send('show-window');
};

window.setAutoHideMenuBar = autoHide =>
  ipc.send('set-auto-hide-menu-bar', autoHide);

window.setMenuBarVisibility = visibility =>
  ipc.send('set-menu-bar-visibility', visibility);

window.restart = () => {
  window.log.info('restart');
  ipc.send('restart');
};

window.closeAbout = () => ipc.send('close-about');
window.readyForUpdates = () => ipc.send('ready-for-updates');

window.updateTrayIcon = unreadCount =>
  ipc.send('update-tray-icon', unreadCount);

ipc.on('set-up-with-import', () => {
  Whisper.events.trigger('setupWithImport');
});

ipc.on('set-up-as-new-device', () => {
  Whisper.events.trigger('setupAsNewDevice');
});

ipc.on('set-up-as-standalone', () => {
  Whisper.events.trigger('setupAsStandalone');
});

// Settings-related events

window.showSettings = () => ipc.send('show-settings');
window.showPermissionsPopup = () => ipc.send('show-permissions-popup');

ipc.on('show-keyboard-shortcuts', () => {
  window.Events.showKeyboardShortcuts();
});
ipc.on('add-dark-overlay', () => {
  window.Events.addDarkOverlay();
});
ipc.on('remove-dark-overlay', () => {
  window.Events.removeDarkOverlay();
});

installGetter('device-name', 'getDeviceName');

installGetter('theme-setting', 'getThemeSetting');
installSetter('theme-setting', 'setThemeSetting');
installGetter('hide-menu-bar', 'getHideMenuBar');
installSetter('hide-menu-bar', 'setHideMenuBar');

installGetter('notification-setting', 'getNotificationSetting');
installSetter('notification-setting', 'setNotificationSetting');
installGetter('audio-notification', 'getAudioNotification');
installSetter('audio-notification', 'setAudioNotification');

installGetter('spell-check', 'getSpellCheck');
installSetter('spell-check', 'setSpellCheck');

window.getMediaPermissions = () =>
  new Promise((resolve, reject) => {
    ipc.once('get-success-media-permissions', (_event, error, value) => {
      if (error) {
        return reject(new Error(error));
      }

      return resolve(value);
    });
    ipc.send('get-media-permissions');
  });

window.getBuiltInImages = () =>
  new Promise((resolve, reject) => {
    ipc.once('get-success-built-in-images', (_event, error, value) => {
      if (error) {
        return reject(new Error(error));
      }

      return resolve(value);
    });
    ipc.send('get-built-in-images');
  });

installGetter('is-primary', 'isPrimary');
installGetter('sync-request', 'getSyncRequest');
installGetter('sync-time', 'getLastSyncTime');
installSetter('sync-time', 'setLastSyncTime');

ipc.on('delete-all-data', () => {
  const { deleteAllData } = window.Events;
  if (deleteAllData) {
    deleteAllData();
  }
});

ipc.on('show-sticker-pack', (_event, info) => {
  const { packId, packKey } = info;
  const { showStickerPack } = window.Events;
  if (showStickerPack) {
    showStickerPack(packId, packKey);
  }
});

ipc.on('get-ready-for-shutdown', async () => {
  const { shutdown } = window.Events || {};
  if (!shutdown) {
    window.log.error('preload shutdown handler: shutdown method not found');
    ipc.send('now-ready-for-shutdown');
    return;
  }

  try {
    await shutdown();
    ipc.send('now-ready-for-shutdown');
  } catch (error) {
    ipc.send(
      'now-ready-for-shutdown',
      error && error.stack ? error.stack : error
    );
  }
});

function installGetter(name, functionName) {
  ipc.on(`get-${name}`, async () => {
    const getFn = window.Events[functionName];
    if (!getFn) {
      ipc.send(
        `get-success-${name}`,
        `installGetter: ${functionName} not found for event ${name}`
      );
      return;
    }
    try {
      ipc.send(`get-success-${name}`, null, await getFn());
    } catch (error) {
      ipc.send(
        `get-success-${name}`,
        error && error.stack ? error.stack : error
      );
    }
  });
}

function installSetter(name, functionName) {
  ipc.on(`set-${name}`, async (_event, value) => {
    const setFn = window.Events[functionName];
    if (!setFn) {
      ipc.send(
        `set-success-${name}`,
        `installSetter: ${functionName} not found for event ${name}`
      );
      return;
    }
    try {
      await setFn(value);
      ipc.send(`set-success-${name}`);
    } catch (error) {
      ipc.send(
        `set-success-${name}`,
        error && error.stack ? error.stack : error
      );
    }
  });
}

window.addSetupMenuItems = () => ipc.send('add-setup-menu-items');
window.removeSetupMenuItems = () => ipc.send('remove-setup-menu-items');

// We pull these dependencies in now, from here, because they have Node.js dependencies

require('./js/logging');

if (config.proxyUrl) {
  window.log.info('Using provided proxy url');
}

window.nodeSetImmediate = setImmediate;

const { initialize: initializeWebAPI } = require('./js/modules/web_api');

window.WebAPI = initializeWebAPI({
  url: config.serverUrl,
  cdnUrl: config.cdnUrl,
  certificateAuthority: config.certificateAuthority,
  contentProxyUrl: config.contentProxyUrl,
  proxyUrl: config.proxyUrl,
});

// Linux seems to periodically let the event loop stop, so this is a global workaround
setInterval(() => {
  window.nodeSetImmediate(() => {});
}, 1000);

const { autoOrientImage } = require('./js/modules/auto_orient_image');

window.autoOrientImage = autoOrientImage;
window.dataURLToBlobSync = require('blueimp-canvas-to-blob');
window.emojiData = require('emoji-datasource');
window.filesize = require('filesize');
window.libphonenumber = require('google-libphonenumber').PhoneNumberUtil.getInstance();
window.libphonenumber.PhoneNumberFormat = require('google-libphonenumber').PhoneNumberFormat;
window.loadImage = require('blueimp-load-image');
window.getGuid = require('uuid/v4');

window.React = require('react');
window.ReactDOM = require('react-dom');
window.moment = require('moment');
window.PQueue = require('p-queue');

const Signal = require('./js/modules/signal');
const i18n = require('./js/modules/i18n');
const Attachments = require('./app/attachments');

const { locale } = config;
window.i18n = i18n.setup(locale, localeMessages);
window.moment.updateLocale(locale, {
  relativeTime: {
    s: window.i18n('timestamp_s'),
    m: window.i18n('timestamp_m'),
    h: window.i18n('timestamp_h'),
  },
});
window.moment.locale(locale);

const userDataPath = app.getPath('userData');
window.baseAttachmentsPath = Attachments.getPath(userDataPath);
window.baseStickersPath = Attachments.getStickersPath(userDataPath);
window.baseTempPath = Attachments.getTempPath(userDataPath);
window.baseDraftPath = Attachments.getDraftPath(userDataPath);
window.Signal = Signal.setup({
  Attachments,
  userDataPath,
  getRegionCode: () => window.storage.get('regionCode'),
  logger: window.log,
});

function wrapWithPromise(fn) {
  return (...args) => Promise.resolve(fn(...args));
}
function typedArrayToArrayBuffer(typedArray) {
  const { buffer, byteOffset, byteLength } = typedArray;
  return buffer.slice(byteOffset, byteLength + byteOffset);
}
const externalCurve = {
  generateKeyPair: () => {
    const { privKey, pubKey } = curve.generateKeyPair();

    return {
      privKey: typedArrayToArrayBuffer(privKey),
      pubKey: typedArrayToArrayBuffer(pubKey),
    };
  },
  createKeyPair: incomingKey => {
    const incomingKeyBuffer = Buffer.from(incomingKey);
    const { privKey, pubKey } = curve.createKeyPair(incomingKeyBuffer);

    return {
      privKey: typedArrayToArrayBuffer(privKey),
      pubKey: typedArrayToArrayBuffer(pubKey),
    };
  },
  calculateAgreement: (pubKey, privKey) => {
    const pubKeyBuffer = Buffer.from(pubKey);
    const privKeyBuffer = Buffer.from(privKey);

    const buffer = curve.calculateAgreement(pubKeyBuffer, privKeyBuffer);

    return typedArrayToArrayBuffer(buffer);
  },
  verifySignature: (pubKey, message, signature) => {
    const pubKeyBuffer = Buffer.from(pubKey);
    const messageBuffer = Buffer.from(message);
    const signatureBuffer = Buffer.from(signature);

    const result = curve.verifySignature(
      pubKeyBuffer,
      messageBuffer,
      signatureBuffer
    );

    return result;
  },
  calculateSignature: (privKey, message) => {
    const privKeyBuffer = Buffer.from(privKey);
    const messageBuffer = Buffer.from(message);

    const buffer = curve.calculateSignature(privKeyBuffer, messageBuffer);

    return typedArrayToArrayBuffer(buffer);
  },
  validatePubKeyFormat: pubKey => {
    const pubKeyBuffer = Buffer.from(pubKey);

    return curve.validatePubKeyFormat(pubKeyBuffer);
  },
};
externalCurve.ECDHE = externalCurve.calculateAgreement;
externalCurve.Ed25519Sign = externalCurve.calculateSignature;
externalCurve.Ed25519Verify = externalCurve.verifySignature;
const externalCurveAsync = {
  generateKeyPair: wrapWithPromise(externalCurve.generateKeyPair),
  createKeyPair: wrapWithPromise(externalCurve.createKeyPair),
  calculateAgreement: wrapWithPromise(externalCurve.calculateAgreement),
  verifySignature: async (...args) => {
    // The async verifySignature function has a different signature than the sync function
    const verifyFailed = externalCurve.verifySignature(...args);
    if (verifyFailed) {
      throw new Error('Invalid signature');
    }
  },
  calculateSignature: wrapWithPromise(externalCurve.calculateSignature),
  validatePubKeyFormat: wrapWithPromise(externalCurve.validatePubKeyFormat),
  ECDHE: wrapWithPromise(externalCurve.ECDHE),
  Ed25519Sign: wrapWithPromise(externalCurve.Ed25519Sign),
  Ed25519Verify: wrapWithPromise(externalCurve.Ed25519Verify),
};
window.libsignal = window.libsignal || {};
window.libsignal.externalCurve = externalCurve;
window.libsignal.externalCurveAsync = externalCurveAsync;

// Pulling these in separately since they access filesystem, electron
window.Signal.Backup = require('./js/modules/backup');
window.Signal.Debug = require('./js/modules/debug');
window.Signal.Logs = require('./js/modules/logs');

// Add right-click listener for selected text and urls
const contextMenu = require('electron-context-menu');

contextMenu({
  showInspectElement: false,
  shouldShowMenu: (event, params) =>
    Boolean(
      !params.isEditable &&
        params.mediaType === 'none' &&
        (params.linkURL || params.selectionText)
    ),
});

// We pull this in last, because the native module involved appears to be sensitive to
//   /tmp mounted as noexec on Linux.
require('./js/spell_check');

if (config.environment === 'test') {
  /* eslint-disable global-require, import/no-extraneous-dependencies */
  window.test = {
    glob: require('glob'),
    fse: require('fs-extra'),
    tmp: require('tmp'),
    path: require('path'),
    basePath: __dirname,
    attachmentsPath: window.Signal.Migrations.attachmentsPath,
  };
  /* eslint-enable global-require, import/no-extraneous-dependencies */
}