ui: Migrate to Auth0 as Identity Provider

This change updates the frontend codebase to move away from the Google
login and instead use Auth0 as generic Identity Provider. This allows
users to login with other accounts as well.

Since Auth0 has a free tier, users can experiment themselves with OpenDC
locally without having to pay for the login functionality. The code has
been written so that we should be able to migrate away from Auth0 once
it is not a suitable Identity Provider for OpenDC anymore.

1 files changed, 53 insertions, 71 deletions

diff --git a/opendc-web/opendc-web-ui/src/auth.js b/opendc-web/opendc-web-ui/src/auth.js
index faed9829..706151bf 100644
--- a/opendc-web/opendc-web-ui/src/auth.js
+++ b/opendc-web/opendc-web-ui/src/auth.js
@@ -1,83 +1,65 @@
-import { LOG_IN_SUCCEEDED, LOG_OUT } from './redux/actions/auth'
-import { DELETE_CURRENT_USER_SUCCEEDED } from './redux/actions/users'
-import { useEffect, useState } from 'react'
-import { useRouter } from 'next/router'
-import { useSelector } from 'react-redux'
-
-const getAuthObject = () => {
-    const authItem = global.localStorage && localStorage.getItem('auth')
-    if (!authItem || authItem === '{}') {
-        return undefined
-    }
-    return JSON.parse(authItem)
-}
-
-export const userIsLoggedIn = () => {
-    const authObj = getAuthObject()
-
-    if (!authObj || !authObj.googleId) {
-        return false
-    }
-
-    const currentTime = new Date().getTime()
-    return parseInt(authObj.expiresAt, 10) - currentTime > 0
-}
-
-export const getAuthToken = () => {
-    const authObj = getAuthObject()
-    if (!authObj) {
-        return undefined
-    }
-
-    return authObj.authToken
-}
-
-export const saveAuthLocalStorage = (payload) => {
-    localStorage.setItem('auth', JSON.stringify(payload))
-}
-
-export const clearAuthLocalStorage = () => {
-    localStorage.setItem('auth', '')
-}
-
-export const authRedirectMiddleware = (store) => (next) => (action) => {
-    switch (action.type) {
-        case LOG_IN_SUCCEEDED:
-            saveAuthLocalStorage(action.payload)
-            window.location.href = '/projects'
-            break
-        case LOG_OUT:
-        case DELETE_CURRENT_USER_SUCCEEDED:
-            clearAuthLocalStorage()
-            window.location.href = '/'
-            break
-        default:
-            next(action)
-            return
-    }
-
-    next(action)
-}
+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
 
-export function useIsLoggedIn() {
-    const [isLoggedIn, setLoggedIn] = useState(false)
-
-    useEffect(() => {
-        setLoggedIn(userIsLoggedIn())
-    }, [])
+import { Auth0Provider, useAuth0 } from '@auth0/auth0-react'
+import { useEffect } from 'react'
+import { useRouter } from 'next/router'
 
-    return isLoggedIn
+/**
+ * Obtain the authentication context.
+ */
+export function useAuth() {
+    return useAuth0()
 }
 
+/**
+ * Force the user to be authenticated or redirect to the homepage.
+ */
 export function useRequireAuth() {
+    const auth = useAuth()
     const router = useRouter()
+    const { isLoading, isAuthenticated } = auth
+
     useEffect(() => {
-        if (!userIsLoggedIn()) {
+        if (!isLoading && !isAuthenticated) {
             router.replace('/')
         }
-    })
+    }, [isLoading, isAuthenticated])
+
+    return auth
 }
 
-export function useUser() {
-    return useSelector((state) => state.auth)
+/**
+ * AuthProvider which provides an authentication context.
+ */
+export function AuthProvider({ children }) {
+    return (
+        <Auth0Provider
+            domain={process.env.NEXT_PUBLIC_AUTH0_DOMAIN}
+            clientId={process.env.NEXT_PUBLIC_AUTH0_CLIENT_ID}
+            redirectUri={global.window && global.window.location.origin}
+            audience={process.env.NEXT_PUBLIC_AUTH0_AUDIENCE}
+        >
+            {children}
+        </Auth0Provider>
+    )
 }