Migrate to Auth0 as Identity Provider

This pull request removes the hard dependency on Google for 
authenticating users and migrates to Auth0 as Identity Provider for OpenDC. 
This has as benefit that we can authenticate users without having to manage 
user data ourselves and do not have a dependency on Google accounts anymore. 

- Frontend cleanup:
   - Use CSS modules everywhere to encapsulate the styling of React components.
   - Perform all communication in the frontend via the REST API (as opposed to WebSockets).
      The original approach was aimed at collaborative editing, but made normal operations 
      harder to implement and debug. If we want to implement collaborative editing in the 
      future, we can expose only a small WebSocket API specifically for collaborative editing.
   - Move to FontAwesome 5 (using the official React libraries)
   - Use Reactstrap where possible. Previously, we mixed raw Bootstrap classes with 
      Reactstrap, which is confusing.
   - Reduce the scope of the Redux state. Some state in the frontend application can be 
      kept locally and does not need to be managed by Redux.
   - Migrate from Create React App (CRA) to Next.js since it allows us to pre-render
      multiple pages as well as opt-in to Server Side Rendering.
   - Remove the Google login and use Auth0 for authentication now.
   - Use Node 16
- Backend cleanup:
   - Remove Socket.IO endpoint from backend, since it is not needed by the frontend 
      anymore. Removing it reduces the attack surface of OpenDC as well as the maintenance efforts.
   - Use Auth0 JWT token for authorizing API accesses
   - Refactor API endpoints to use Flask Restful as opposed to our custom in-house 
      routing logic. Previously, this was needed to support the Socket.IO endpoint, 
      but increases maintenance effort.
   - Expose Swagger UI from API
   - Use Python 3.9 and uwsgi to host Flask application
- Actualize OpenAPI schema and update to version 3.0.

**Breaking API Changes**

* This pull request removes the users collection from the database table. Instead, we now use the user identifier passed by Auth0 to identify the data that belongs to a user.

7 files changed, 301 insertions, 0 deletions

diff --git a/opendc-web/opendc-web-ui/src/redux/reducers/construction-mode.js b/opendc-web/opendc-web-ui/src/redux/reducers/construction-mode.js
new file mode 100644
index 00000000..257dddd2
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/redux/reducers/construction-mode.js
@@ -0,0 +1,52 @@
+import { combineReducers } from 'redux'
+import { GO_DOWN_ONE_INTERACTION_LEVEL } from '../actions/interaction-level'
+import {
+    CANCEL_NEW_ROOM_CONSTRUCTION_SUCCEEDED,
+    FINISH_NEW_ROOM_CONSTRUCTION,
+    FINISH_ROOM_EDIT,
+    SET_CURRENT_TOPOLOGY,
+    START_NEW_ROOM_CONSTRUCTION_SUCCEEDED,
+    START_ROOM_EDIT,
+} from '../actions/topology/building'
+import { DELETE_ROOM, START_RACK_CONSTRUCTION, STOP_RACK_CONSTRUCTION } from '../actions/topology/room'
+import { OPEN_PORTFOLIO_SUCCEEDED } from '../actions/portfolios'
+import { OPEN_SCENARIO_SUCCEEDED } from '../actions/scenarios'
+
+export function currentRoomInConstruction(state = '-1', action) {
+    switch (action.type) {
+        case START_NEW_ROOM_CONSTRUCTION_SUCCEEDED:
+            return action.roomId
+        case START_ROOM_EDIT:
+            return action.roomId
+        case CANCEL_NEW_ROOM_CONSTRUCTION_SUCCEEDED:
+        case FINISH_NEW_ROOM_CONSTRUCTION:
+        case OPEN_PORTFOLIO_SUCCEEDED:
+        case OPEN_SCENARIO_SUCCEEDED:
+        case FINISH_ROOM_EDIT:
+        case SET_CURRENT_TOPOLOGY:
+        case DELETE_ROOM:
+            return '-1'
+        default:
+            return state
+    }
+}
+
+export function inRackConstructionMode(state = false, action) {
+    switch (action.type) {
+        case START_RACK_CONSTRUCTION:
+            return true
+        case STOP_RACK_CONSTRUCTION:
+        case OPEN_PORTFOLIO_SUCCEEDED:
+        case OPEN_SCENARIO_SUCCEEDED:
+        case SET_CURRENT_TOPOLOGY:
+        case GO_DOWN_ONE_INTERACTION_LEVEL:
+            return false
+        default:
+            return state
+    }
+}
+
+export const construction = combineReducers({
+    currentRoomInConstruction,
+    inRackConstructionMode,
+})
diff --git a/opendc-web/opendc-web-ui/src/redux/reducers/current-ids.js b/opendc-web/opendc-web-ui/src/redux/reducers/current-ids.js
new file mode 100644
index 00000000..9b46aa60
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/redux/reducers/current-ids.js
@@ -0,0 +1,54 @@
+import { OPEN_PORTFOLIO_SUCCEEDED, SET_CURRENT_PORTFOLIO } from '../actions/portfolios'
+import { OPEN_PROJECT_SUCCEEDED } from '../actions/projects'
+import { SET_CURRENT_TOPOLOGY } from '../actions/topology/building'
+import { OPEN_SCENARIO_SUCCEEDED, SET_CURRENT_SCENARIO } from '../actions/scenarios'
+
+export function currentTopologyId(state = '-1', action) {
+    switch (action.type) {
+        case SET_CURRENT_TOPOLOGY:
+            return action.topologyId
+        default:
+            return state
+    }
+}
+
+export function currentProjectId(state = '-1', action) {
+    switch (action.type) {
+        case OPEN_PROJECT_SUCCEEDED:
+            return action.id
+        case OPEN_PORTFOLIO_SUCCEEDED:
+        case OPEN_SCENARIO_SUCCEEDED:
+            return action.projectId
+        default:
+            return state
+    }
+}
+
+export function currentPortfolioId(state = '-1', action) {
+    switch (action.type) {
+        case OPEN_PORTFOLIO_SUCCEEDED:
+        case SET_CURRENT_PORTFOLIO:
+        case SET_CURRENT_SCENARIO:
+            return action.portfolioId
+        case OPEN_SCENARIO_SUCCEEDED:
+            return action.portfolioId
+        case OPEN_PROJECT_SUCCEEDED:
+        case SET_CURRENT_TOPOLOGY:
+            return '-1'
+        default:
+            return state
+    }
+}
+export function currentScenarioId(state = '-1', action) {
+    switch (action.type) {
+        case OPEN_SCENARIO_SUCCEEDED:
+        case SET_CURRENT_SCENARIO:
+            return action.scenarioId
+        case OPEN_PORTFOLIO_SUCCEEDED:
+        case SET_CURRENT_TOPOLOGY:
+        case OPEN_PROJECT_SUCCEEDED:
+            return '-1'
+        default:
+            return state
+    }
+}
diff --git a/opendc-web/opendc-web-ui/src/redux/reducers/index.js b/opendc-web/opendc-web-ui/src/redux/reducers/index.js
new file mode 100644
index 00000000..b143d417
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/redux/reducers/index.js
@@ -0,0 +1,21 @@
+import { combineReducers } from 'redux'
+import { construction } from './construction-mode'
+import { currentPortfolioId, currentProjectId, currentScenarioId, currentTopologyId } from './current-ids'
+import { interactionLevel } from './interaction-level'
+import { map } from './map'
+import { objects } from './objects'
+import { projects } from './projects'
+
+const rootReducer = combineReducers({
+    objects,
+    projects,
+    construction,
+    map,
+    currentProjectId,
+    currentTopologyId,
+    currentPortfolioId,
+    currentScenarioId,
+    interactionLevel,
+})
+
+export default rootReducer
diff --git a/opendc-web/opendc-web-ui/src/redux/reducers/interaction-level.js b/opendc-web/opendc-web-ui/src/redux/reducers/interaction-level.js
new file mode 100644
index 00000000..eafcb269
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/redux/reducers/interaction-level.js
@@ -0,0 +1,61 @@
+import { OPEN_PORTFOLIO_SUCCEEDED } from '../actions/portfolios'
+import {
+    GO_DOWN_ONE_INTERACTION_LEVEL,
+    GO_FROM_BUILDING_TO_ROOM,
+    GO_FROM_RACK_TO_MACHINE,
+    GO_FROM_ROOM_TO_RACK,
+} from '../actions/interaction-level'
+import { OPEN_PROJECT_SUCCEEDED } from '../actions/projects'
+import { SET_CURRENT_TOPOLOGY } from '../actions/topology/building'
+import { OPEN_SCENARIO_SUCCEEDED } from '../actions/scenarios'
+
+export function interactionLevel(state = { mode: 'BUILDING' }, action) {
+    switch (action.type) {
+        case OPEN_PORTFOLIO_SUCCEEDED:
+        case OPEN_SCENARIO_SUCCEEDED:
+        case OPEN_PROJECT_SUCCEEDED:
+        case SET_CURRENT_TOPOLOGY:
+            return {
+                mode: 'BUILDING',
+            }
+        case GO_FROM_BUILDING_TO_ROOM:
+            return {
+                mode: 'ROOM',
+                roomId: action.roomId,
+            }
+        case GO_FROM_ROOM_TO_RACK:
+            return {
+                mode: 'RACK',
+                roomId: state.roomId,
+                tileId: action.tileId,
+            }
+        case GO_FROM_RACK_TO_MACHINE:
+            return {
+                mode: 'MACHINE',
+                roomId: state.roomId,
+                tileId: state.tileId,
+                position: action.position,
+            }
+        case GO_DOWN_ONE_INTERACTION_LEVEL:
+            if (state.mode === 'ROOM') {
+                return {
+                    mode: 'BUILDING',
+                }
+            } else if (state.mode === 'RACK') {
+                return {
+                    mode: 'ROOM',
+                    roomId: state.roomId,
+                }
+            } else if (state.mode === 'MACHINE') {
+                return {
+                    mode: 'RACK',
+                    roomId: state.roomId,
+                    tileId: state.tileId,
+                }
+            } else {
+                return state
+            }
+        default:
+            return state
+    }
+}
diff --git a/opendc-web/opendc-web-ui/src/redux/reducers/map.js b/opendc-web/opendc-web-ui/src/redux/reducers/map.js
new file mode 100644
index 00000000..de712c15
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/redux/reducers/map.js
@@ -0,0 +1,35 @@
+import { combineReducers } from 'redux'
+import { SET_MAP_DIMENSIONS, SET_MAP_POSITION, SET_MAP_SCALE } from '../actions/map'
+
+export function position(state = { x: 0, y: 0 }, action) {
+    switch (action.type) {
+        case SET_MAP_POSITION:
+            return { x: action.x, y: action.y }
+        default:
+            return state
+    }
+}
+
+export function dimensions(state = { width: 600, height: 400 }, action) {
+    switch (action.type) {
+        case SET_MAP_DIMENSIONS:
+            return { width: action.width, height: action.height }
+        default:
+            return state
+    }
+}
+
+export function scale(state = 1, action) {
+    switch (action.type) {
+        case SET_MAP_SCALE:
+            return action.scale
+        default:
+            return state
+    }
+}
+
+export const map = combineReducers({
+    position,
+    dimensions,
+    scale,
+})
diff --git a/opendc-web/opendc-web-ui/src/redux/reducers/objects.js b/opendc-web/opendc-web-ui/src/redux/reducers/objects.js
new file mode 100644
index 00000000..a2483b43
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/redux/reducers/objects.js
@@ -0,0 +1,64 @@
+import { combineReducers } from 'redux'
+import {
+    ADD_ID_TO_STORE_OBJECT_LIST_PROP,
+    ADD_PROP_TO_STORE_OBJECT,
+    ADD_TO_STORE,
+    REMOVE_ID_FROM_STORE_OBJECT_LIST_PROP,
+} from '../actions/objects'
+import { CPU_UNITS, GPU_UNITS, MEMORY_UNITS, STORAGE_UNITS } from '../../util/unit-specifications'
+
+export const objects = combineReducers({
+    project: object('project'),
+    user: object('user'),
+    authorization: objectWithId('authorization', (object) => [object.userId, object.projectId]),
+    cpu: object('cpu', CPU_UNITS),
+    gpu: object('gpu', GPU_UNITS),
+    memory: object('memory', MEMORY_UNITS),
+    storage: object('storage', STORAGE_UNITS),
+    machine: object('machine'),
+    rack: object('rack'),
+    tile: object('tile'),
+    room: object('room'),
+    topology: object('topology'),
+    trace: object('trace'),
+    scheduler: object('scheduler'),
+    portfolio: object('portfolio'),
+    scenario: object('scenario'),
+    prefab: object('prefab'),
+})
+
+function object(type, defaultState = {}) {
+    return objectWithId(type, (object) => object._id, defaultState)
+}
+
+function objectWithId(type, getId, defaultState = {}) {
+    return (state = defaultState, action) => {
+        if (action.objectType !== type) {
+            return state
+        }
+
+        if (action.type === ADD_TO_STORE) {
+            return Object.assign({}, state, {
+                [getId(action.object)]: action.object,
+            })
+        } else if (action.type === ADD_PROP_TO_STORE_OBJECT) {
+            return Object.assign({}, state, {
+                [action.objectId]: Object.assign({}, state[action.objectId], action.propObject),
+            })
+        } else if (action.type === ADD_ID_TO_STORE_OBJECT_LIST_PROP) {
+            return Object.assign({}, state, {
+                [action.objectId]: Object.assign({}, state[action.objectId], {
+                    [action.propName]: [...state[action.objectId][action.propName], action.id],
+                }),
+            })
+        } else if (action.type === REMOVE_ID_FROM_STORE_OBJECT_LIST_PROP) {
+            return Object.assign({}, state, {
+                [action.objectId]: Object.assign({}, state[action.objectId], {
+                    [action.propName]: state[action.objectId][action.propName].filter((id) => id !== action.id),
+                }),
+            })
+        }
+
+        return state
+    }
+}
diff --git a/opendc-web/opendc-web-ui/src/redux/reducers/projects.js b/opendc-web/opendc-web-ui/src/redux/reducers/projects.js
new file mode 100644
index 00000000..a920e47f
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/redux/reducers/projects.js
@@ -0,0 +1,14 @@
+import { ADD_PROJECT_SUCCEEDED, DELETE_PROJECT_SUCCEEDED, FETCH_PROJECTS_SUCCEEDED } from '../actions/projects'
+
+export function projects(state = [], action) {
+    switch (action.type) {
+        case FETCH_PROJECTS_SUCCEEDED:
+            return action.projects
+        case ADD_PROJECT_SUCCEEDED:
+            return [...state, action.project]
+        case DELETE_PROJECT_SUCCEEDED:
+            return state.filter((project) => project._id !== action.id)
+        default:
+            return state
+    }
+}