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.

1 files changed, 234 insertions, 0 deletions

diff --git a/opendc-web/opendc-web-ui/src/redux/sagas/objects.js b/opendc-web/opendc-web-ui/src/redux/sagas/objects.js
new file mode 100644
index 00000000..e5fd092d
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/redux/sagas/objects.js
@@ -0,0 +1,234 @@
+import { call, put, select, getContext } from 'redux-saga/effects'
+import { addToStore } from '../actions/objects'
+import { getAllSchedulers } from '../../api/schedulers'
+import { getProject } from '../../api/projects'
+import { getAllTraces } from '../../api/traces'
+import { getTopology, updateTopology } from '../../api/topologies'
+import { uuid } from 'uuidv4'
+
+export const OBJECT_SELECTORS = {
+    project: (state) => state.objects.project,
+    user: (state) => state.objects.user,
+    authorization: (state) => state.objects.authorization,
+    portfolio: (state) => state.objects.portfolio,
+    scenario: (state) => state.objects.scenario,
+    cpu: (state) => state.objects.cpu,
+    gpu: (state) => state.objects.gpu,
+    memory: (state) => state.objects.memory,
+    storage: (state) => state.objects.storage,
+    machine: (state) => state.objects.machine,
+    rack: (state) => state.objects.rack,
+    tile: (state) => state.objects.tile,
+    room: (state) => state.objects.room,
+    topology: (state) => state.objects.topology,
+}
+
+function* fetchAndStoreObject(objectType, id, apiCall) {
+    const objectStore = yield select(OBJECT_SELECTORS[objectType])
+    let object = objectStore[id]
+    if (!object) {
+        object = yield apiCall
+        yield put(addToStore(objectType, object))
+    }
+    return object
+}
+
+function* fetchAndStoreObjects(objectType, apiCall) {
+    const objects = yield apiCall
+    for (let object of objects) {
+        yield put(addToStore(objectType, object))
+    }
+    return objects
+}
+
+export const fetchAndStoreProject = function* (id) {
+    const auth = yield getContext('auth')
+    return yield fetchAndStoreObject('project', id, call(getProject, auth, id))
+}
+
+export const fetchAndStoreTopology = function* (id) {
+    const topologyStore = yield select(OBJECT_SELECTORS['topology'])
+    const roomStore = yield select(OBJECT_SELECTORS['room'])
+    const tileStore = yield select(OBJECT_SELECTORS['tile'])
+    const rackStore = yield select(OBJECT_SELECTORS['rack'])
+    const machineStore = yield select(OBJECT_SELECTORS['machine'])
+    const auth = yield getContext('auth')
+
+    let topology = topologyStore[id]
+    if (!topology) {
+        const fullTopology = yield call(getTopology, auth, id)
+
+        for (let roomIdx in fullTopology.rooms) {
+            const fullRoom = fullTopology.rooms[roomIdx]
+
+            generateIdIfNotPresent(fullRoom)
+
+            if (!roomStore[fullRoom._id]) {
+                for (let tileIdx in fullRoom.tiles) {
+                    const fullTile = fullRoom.tiles[tileIdx]
+
+                    generateIdIfNotPresent(fullTile)
+
+                    if (!tileStore[fullTile._id]) {
+                        if (fullTile.rack) {
+                            const fullRack = fullTile.rack
+
+                            generateIdIfNotPresent(fullRack)
+
+                            if (!rackStore[fullRack._id]) {
+                                for (let machineIdx in fullRack.machines) {
+                                    const fullMachine = fullRack.machines[machineIdx]
+
+                                    generateIdIfNotPresent(fullMachine)
+
+                                    if (!machineStore[fullMachine._id]) {
+                                        let machine = (({ _id, position, cpus, gpus, memories, storages }) => ({
+                                            _id,
+                                            rackId: fullRack._id,
+                                            position,
+                                            cpuIds: cpus.map((u) => u._id),
+                                            gpuIds: gpus.map((u) => u._id),
+                                            memoryIds: memories.map((u) => u._id),
+                                            storageIds: storages.map((u) => u._id),
+                                        }))(fullMachine)
+                                        yield put(addToStore('machine', machine))
+                                    }
+                                }
+
+                                const filledSlots = new Array(fullRack.capacity).fill(null)
+                                fullRack.machines.forEach(
+                                    (machine) => (filledSlots[machine.position - 1] = machine._id)
+                                )
+                                let rack = (({ _id, name, capacity, powerCapacityW }) => ({
+                                    _id,
+                                    name,
+                                    capacity,
+                                    powerCapacityW,
+                                    machineIds: filledSlots,
+                                }))(fullRack)
+                                yield put(addToStore('rack', rack))
+                            }
+                        }
+
+                        let tile = (({ _id, positionX, positionY, rack }) => ({
+                            _id,
+                            roomId: fullRoom._id,
+                            positionX,
+                            positionY,
+                            rackId: rack ? rack._id : undefined,
+                        }))(fullTile)
+                        yield put(addToStore('tile', tile))
+                    }
+                }
+
+                let room = (({ _id, name, tiles }) => ({ _id, name, tileIds: tiles.map((t) => t._id) }))(fullRoom)
+                yield put(addToStore('room', room))
+            }
+        }
+
+        topology = (({ _id, name, rooms }) => ({ _id, name, roomIds: rooms.map((r) => r._id) }))(fullTopology)
+        yield put(addToStore('topology', topology))
+
+        // TODO consider pushing the IDs
+    }
+
+    return topology
+}
+
+const generateIdIfNotPresent = (obj) => {
+    if (!obj._id) {
+        obj._id = uuid()
+    }
+}
+
+export const updateTopologyOnServer = function* (id) {
+    const topology = yield getTopologyAsObject(id, true)
+    const auth = yield getContext('auth')
+    yield call(updateTopology, auth, topology)
+}
+
+export const getTopologyAsObject = function* (id, keepIds) {
+    const topologyStore = yield select(OBJECT_SELECTORS['topology'])
+    const rooms = yield getAllRooms(topologyStore[id].roomIds, keepIds)
+    return {
+        _id: keepIds ? id : undefined,
+        name: topologyStore[id].name,
+        rooms: rooms,
+    }
+}
+
+export const getAllRooms = function* (roomIds, keepIds) {
+    const roomStore = yield select(OBJECT_SELECTORS['room'])
+
+    let rooms = []
+
+    for (let id of roomIds) {
+        let tiles = yield getAllRoomTiles(roomStore[id], keepIds)
+        rooms.push({
+            _id: keepIds ? id : undefined,
+            name: roomStore[id].name,
+            tiles: tiles,
+        })
+    }
+    return rooms
+}
+
+export const getAllRoomTiles = function* (roomStore, keepIds) {
+    let tiles = []
+
+    for (let id of roomStore.tileIds) {
+        tiles.push(yield getTileById(id, keepIds))
+    }
+    return tiles
+}
+
+export const getTileById = function* (id, keepIds) {
+    const tileStore = yield select(OBJECT_SELECTORS['tile'])
+    return {
+        _id: keepIds ? id : undefined,
+        positionX: tileStore[id].positionX,
+        positionY: tileStore[id].positionY,
+        rack: !tileStore[id].rackId ? undefined : yield getRackById(tileStore[id].rackId, keepIds),
+    }
+}
+
+export const getRackById = function* (id, keepIds) {
+    const rackStore = yield select(OBJECT_SELECTORS['rack'])
+    const machineStore = yield select(OBJECT_SELECTORS['machine'])
+    const cpuStore = yield select(OBJECT_SELECTORS['cpu'])
+    const gpuStore = yield select(OBJECT_SELECTORS['gpu'])
+    const memoryStore = yield select(OBJECT_SELECTORS['memory'])
+    const storageStore = yield select(OBJECT_SELECTORS['storage'])
+
+    return {
+        _id: keepIds ? rackStore[id]._id : undefined,
+        name: rackStore[id].name,
+        capacity: rackStore[id].capacity,
+        powerCapacityW: rackStore[id].powerCapacityW,
+        machines: rackStore[id].machineIds
+            .filter((m) => m !== null)
+            .map((machineId) => ({
+                _id: keepIds ? machineId : undefined,
+                position: machineStore[machineId].position,
+                cpus: machineStore[machineId].cpuIds.map((id) => cpuStore[id]),
+                gpus: machineStore[machineId].gpuIds.map((id) => gpuStore[id]),
+                memories: machineStore[machineId].memoryIds.map((id) => memoryStore[id]),
+                storages: machineStore[machineId].storageIds.map((id) => storageStore[id]),
+            })),
+    }
+}
+
+export const fetchAndStoreAllTraces = function* () {
+    const auth = yield getContext('auth')
+    return yield fetchAndStoreObjects('trace', call(getAllTraces, auth))
+}
+
+export const fetchAndStoreAllSchedulers = function* () {
+    const auth = yield getContext('auth')
+    const objects = yield call(getAllSchedulers, auth)
+    for (let object of objects) {
+        object._id = object.name
+        yield put(addToStore('scheduler', object))
+    }
+    return objects
+}