Move all files under /app to typescript

app/permissions.ts

@@ -0,0 +1,88 @@
+// Copyright 2018-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+// The list of permissions is here:
+//   https://electronjs.org/docs/api/session#sessetpermissionrequesthandlerhandler
+
+import { session as ElectronSession } from 'electron';
+
+import { ConfigType } from './config';
+
+const PERMISSIONS: Record<string, boolean> = {
+  // Allowed
+  fullscreen: true, // required to show videos in full-screen
+  notifications: true, // required to show OS notifications for new messages
+
+  // Off by default, can be enabled by user
+  media: false, // required for access to microphone and camera, used for voice notes and calling
+
+  // Not allowed
+  geolocation: false,
+  midiSysex: false,
+  openExternal: false, // we don't need this; we open links via 'will-navigate' event
+  pointerLock: false,
+};
+
+function _createPermissionHandler(
+  userConfig: ConfigType
+): Parameters<typeof ElectronSession.prototype.setPermissionRequestHandler>[0] {
+  return (_webContents, permission, callback, details): void => {
+    // We default 'media' permission to false, but the user can override that for
+    // the microphone and camera.
+    if (permission === 'media') {
+      if (
+        details.mediaTypes?.includes('audio') ||
+        details.mediaTypes?.includes('video')
+      ) {
+        if (
+          details.mediaTypes?.includes('audio') &&
+          userConfig.get('mediaPermissions')
+        ) {
+          callback(true);
+          return;
+        }
+        if (
+          details.mediaTypes?.includes('video') &&
+          userConfig.get('mediaCameraPermissions')
+        ) {
+          callback(true);
+          return;
+        }
+
+        callback(false);
+        return;
+      }
+
+      // If it doesn't have 'video' or 'audio', it's probably screenshare.
+      // TODO: DESKTOP-1611
+      callback(true);
+      return;
+    }
+
+    if (PERMISSIONS[permission]) {
+      console.log(`Approving request for permission '${permission}'`);
+      callback(true);
+      return;
+    }
+
+    console.log(`Denying request for permission '${permission}'`);
+    callback(false);
+  };
+}
+
+export function installPermissionsHandler({
+  session,
+  userConfig,
+}: {
+  session: typeof ElectronSession;
+  userConfig: ConfigType;
+}): void {
+  // Setting the permission request handler to null first forces any permissions to be
+  //   requested again. Without this, revoked permissions might still be available if
+  //   they've already been used successfully.
+  session.defaultSession.setPermissionRequestHandler(null);
+
+  session.defaultSession.setPermissionRequestHandler(
+    _createPermissionHandler(userConfig)
+  );
+}