allow non-loggedin users to access public bucket (#5570)

* conditionally render main action buttons

- Make bucket action will be available only for loggedIn users
- File upload button will be avaialble for loggedIn users
  and non-loggedIn users if the prefix is writable

* select the bucket and prefix from the url

When the url contains bucket and prefix, it will be selected
by default instead of the first bucket from the list.

* show BucketSearch only for LoggedIn users

* allow non-LoggedIn users to access public bucket

* removed unused Router imports

* fix test case failures in BucketList.test.js

* remove dupicate minioBrowserPrefix from url

since history is already initialized with minioBrowserPrefix,
no need to use it in push or replace

* remove unused match from App component

* remove unused minioBrowserPrefix imports

browser/app/js/browser/__tests__/SideBar.test.js

@@ -18,11 +18,20 @@ import React from "react"
 import { shallow } from "enzyme"
 import { SideBar } from "../SideBar"
 
+jest.mock("../../web", () => ({
+  LoggedIn: jest.fn(() => false).mockReturnValueOnce(true)
+}))
+
 describe("SideBar", () => {
   it("should render without crashing", () => {
     shallow(<SideBar />)
   })
 
+  it("should not render BucketSearch for non LoggedIn users", () => {
+    const wrapper = shallow(<SideBar />)
+    expect(wrapper.find("Connect(BucketSearch)").length).toBe(0)
+  })
+
   it("should call clickOutside when the user clicks outside the sidebar", () => {
     const clickOutside = jest.fn()
     const wrapper = shallow(<SideBar clickOutside={clickOutside} />)