Separate userinfo from the config endpoint (#1728)

* Separate userinfo from the config endpoint

previously information about if the user was logged in and their username
was part of the config endpoint.
However, the config endpoint was previously static, and has a cache control.
Rather than not caching the config, a new endpoint called "userinfo"
is created to handle that information.

The config endpoint still has the non-changing part of the authentication:

  config:
    authentication:
        requires_client_login:  True/False
        login: <uri to login endoint if requires_client_login is True>
        logout: <uri to logout endoint if requires_client_login is True>

The userinfo endpoint returns this information:

  userinfo:
    is_authenticated:  True/False
    username: <string if is_authenticated>

if authentication is not enabled then the config does not have an authentication key,
and userinfo returns None.

Also in the PR are a few minor code improvements and bug fixes

Co-authored-by: Colin Megill <colinmegill@gmail.com>

client/src/reducers/index.js

@@ -4,6 +4,7 @@ import thunk from "redux-thunk";
 import cascadeReducers from "./cascade";
 import undoable from "./undoable";
 import config from "./config";
+import userinfo from "./userinfo";
 import annoMatrix from "./annoMatrix";
 import obsCrossfilter from "./obsCrossfilter";
 import categoricalSelection from "./categoricalSelection";
@@ -41,6 +42,7 @@ const Reducer = undoable(
     ["pointDilation", pointDialation],
     ["reembedController", reembedController],
     ["autosave", autosave],
+    ["userinfo", userinfo],
   ]),
   [
     "annoMatrix",

client/src/reducers/userinfo.js

@@ -0,0 +1,27 @@
+// jshint esversion: 6
+const UserInfo = (state = {}, action) => {
+  switch (action.type) {
+    case "initial data load start":
+      return {
+        ...state,
+        loading: true,
+        error: null,
+      };
+    case "userinfo load complete":
+      return {
+        ...state,
+        loading: false,
+        error: null,
+        ...action.userinfo,
+      };
+    case "initial data load error":
+      return {
+        ...state,
+        error: action.error,
+      };
+    default:
+      return state;
+  }
+};
+
+export default UserInfo;