Login / Logout button (#1718)

* first pass auth button

* only pop anno dialogue if authenticated

* add config to ignore

* remove config

client/src/components/menubar/authButtons.js

@@ -0,0 +1,32 @@
+import React from "react";
+import { AnchorButton, Tooltip } from "@blueprintjs/core";
+import * as globals from "../../globals";
+import styles from "./menubar.css";
+
+const Auth = React.memo((props) => {
+  const { auth } = props;
+
+  if (!auth || (auth && !auth.requires_client_login)) return null;
+
+  return (
+    <div className={`bp3-button-group ${styles.menubarButton}`}>
+      <Tooltip
+        content="Log in or log out of cellxgene"
+        position="bottom"
+        hoverOpenDelay={globals.tooltipHoverOpenDelay}
+      >
+        <AnchorButton
+          type="button"
+          data-testid="auth-button"
+          disabled={false}
+          icon={!auth.is_authenticated ? "log-in" : "log-out"}
+          href={!auth.is_authenticated ? auth.login : auth.logout}
+        >
+          {!auth.is_authenticated ? "Log In" : "Log Out"}
+        </AnchorButton>
+      </Tooltip>
+    </div>
+  );
+});
+
+export default Auth;