agendas: fix import event crashing with nested quotes (#66187)

chrono/manager/forms.py

@@ -1043,6 +1043,7 @@ class ImportEventsForm(forms.Form):
 
         try:
             dialect = csv.Sniffer().sniff(content)
+            dialect.doublequote = True
         except csv.Error:
             dialect = None
 

tests/manager/test_event.py

@@ -995,6 +995,37 @@ def test_import_events(app, admin_user):
     assert 'Identifier:' in resp.text  # verbose_name is shown, not field name ('slug:')
 
 
+def test_import_event_nested_quotes(app, admin_user):
+    agenda = Agenda(label='Foo bar')
+    agenda.save()
+    app = login(app)
+
+    resp = app.get('/manage/agendas/%s/import-events' % agenda.id, status=200)
+    resp.form['events_csv_file'] = Upload(
+        't.csv',
+        ','.join(
+            [
+                "2016-09-16",
+                "18:00",
+                "10",
+                "5",
+                "éléphant",
+                "elephant",
+                # the multiline description and final dot
+                # and new line after ""éléphants"" are needed to trigger the bug.
+                '''"Animation:
+                    De nombreux ""éléphants"".
+"''',
+            ]
+        ).encode(),
+        'text/csv',
+    )
+
+    resp = resp.form.submit(status=302)
+    assert Event.objects.count() == 1
+    assert 'De nombreux "éléphants"' in Event.objects.all()[0].description
+
+
 def test_import_events_existing_event(app, admin_user, freezer):
     agenda = Agenda.objects.create(label='Foo bar')
     Desk.objects.create(agenda=agenda, slug='_exceptions_holder')