user reducer

Reviewed By: jknoxville

Differential Revision: D14224403

fbshipit-source-id: 8341dd8af03148c4b1f648641bda522804acb22d

src/dispatcher/user.js

@@ -0,0 +1,27 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+
+import type {Store} from '../reducers/index.js';
+import type {Logger} from '../fb-interfaces/Logger.js';
+import {login} from '../reducers/user';
+import {getUser, logoutUser} from '../fb-stubs/user';
+
+export default (store: Store, logger: Logger) => {
+  getUser()
+    .then(user => {
+      store.dispatch(login(user));
+    })
+    .catch(console.debug);
+
+  let prevUserName = store.getState().user.name;
+  store.subscribe(() => {
+    if (prevUserName && !store.getState().user.name) {
+      logoutUser();
+    }
+    prevUserName = store.getState().user.name;
+  });
+};