Add notifications from Google Drive to automatically get updates from Google Sheets

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

participation/views.py

@@ -1,7 +1,9 @@
 # Copyright (C) 2020 by Animath
 # SPDX-License-Identifier: GPL-3.0-or-later
-
+import asyncio
 import csv
+from concurrent.futures import ThreadPoolExecutor
+from hashlib import sha1
 from io import BytesIO
 import os
 import subprocess
@@ -9,6 +11,7 @@ from tempfile import mkdtemp
 from typing import Any, Dict
 from zipfile import ZipFile
 
+from asgiref.sync import sync_to_async
 from django.conf import settings
 from django.contrib import messages
 from django.contrib.auth.mixins import LoginRequiredMixin
@@ -23,7 +26,9 @@ from django.template.loader import render_to_string
 from django.urls import reverse_lazy
 from django.utils import timezone
 from django.utils.crypto import get_random_string
+from django.utils.decorators import method_decorator
 from django.utils.translation import gettext_lazy as _
+from django.views.decorators.csrf import csrf_exempt
 from django.views.generic import CreateView, DetailView, FormView, RedirectView, TemplateView, UpdateView, View
 from django.views.generic.detail import SingleObjectMixin
 from django.views.generic.edit import FormMixin, ProcessFormView
@@ -1874,6 +1879,29 @@ class NotationSheetsArchiveView(VolunteerMixin, DetailView):
         return response
 
 
+@method_decorator(csrf_exempt, name='dispatch')
+class GSheetNotificationsView(View):
+    async def post(self, request, *args, **kwargs):
+        if not await Tournament.objects.filter(pk=kwargs['pk']).aexists():
+            return HttpResponse(status=404)
+
+        tournament = await Tournament.objects.prefetch_related('participations', 'pools').aget(pk=kwargs['pk'])
+        request.site.domain = "test.ynerant.fr"
+        expected_channel_id = sha1(f"{tournament.name}{timezone.now().date()}{request.site.domain}".encode()) \
+            .hexdigest()
+
+        if request.headers['X-Goog-Channel-ID'] != expected_channel_id:
+            raise ValueError(f"Invalid channel ID: {request.headers['X-Goog-Channel-ID']}")
+
+        # Run the parsing in dedicated executors since it takes time
+        executor = ThreadPoolExecutor()
+        async for pool in tournament.pools.prefetch_related('participations', 'passages__notes', 'juries').all():
+            asyncio.get_event_loop().run_in_executor(executor, pool.parse_spreadsheet)
+        asyncio.get_event_loop().run_in_executor(executor, tournament.parse_tweaks_spreadsheets)
+
+        return HttpResponse(status=204)
+
+
 class PassageDetailView(LoginRequiredMixin, DetailView):
     model = Passage