Normalise content for non-templated broadcast events

We found that non-templated broadcast messages weren’t having their
content normalised before saving into an event.

This means that stuff like `\r\n` and curly quotes were being passed
through to the CBC proxy.

This commit firstly changes templated events to use
`str(BroadcastMessageTemplate)` to normalise the content, because it’s
non-obvious that calling
`BroadcastMessageTemplate.content_with_placeholders_filled_in` also
normalises content.

Then it changes the non-templated route to also call
`str(BroadcastMessageTemplate)`, where previously it was passing the
content straight through.

app/broadcast_message/rest.py

@@ -111,13 +111,12 @@ def create_broadcast_message(service_id):
         template = dao_get_template_by_id_and_service_id(
             template_id, data['service_id']
         )
-        content = template._as_utils_template_with_personalisation(
+        content = str(template._as_utils_template_with_personalisation(
             personalisation
-        ).content_with_placeholders_filled_in
+        ))
         reference = None
     else:
-        template, content, reference = None, data['content'], data['reference']
+        temporary_template = BroadcastMessageTemplate.from_content(data['content'])
-        temporary_template = BroadcastMessageTemplate.from_content(content)
         if temporary_template.content_too_long:
             raise InvalidRequest(
                 (
@@ -130,6 +129,9 @@ def create_broadcast_message(service_id):
                 ),
                 status_code=400,
             )
+        template = None
+        content = str(temporary_template)
+        reference = data['reference']
 
     broadcast_message = BroadcastMessage(
         service_id=service.id,

tests/app/broadcast_message/test_rest.py

@@ -130,7 +130,11 @@ def test_get_broadcast_messages_for_service(admin_request, sample_broadcast_serv
 @pytest.mark.parametrize('training_mode_service', [True, False])
 def test_create_broadcast_message(admin_request, sample_broadcast_service, training_mode_service):
     sample_broadcast_service.restricted = training_mode_service
-    t = create_template(sample_broadcast_service, BROADCAST_TYPE)
+    t = create_template(
+        sample_broadcast_service,
+        BROADCAST_TYPE,
+        content='Some content\r\n€ŷŵ~\r\n‘’“”—–-',
+    )
 
     response = admin_request.post(
         'broadcast_message.create_broadcast_message',
@@ -149,6 +153,7 @@ def test_create_broadcast_message(admin_request, sample_broadcast_service, train
     assert response['created_by_id'] == str(t.created_by_id)
     assert response['personalisation'] == {}
     assert response['areas'] == []
+    assert response['content'] == 'Some content\n€ŷŵ~\n\'\'""---'
 
     broadcast_message = dao_get_broadcast_message_by_id_and_service_id(response["id"], sample_broadcast_service.id)
     assert broadcast_message.stubbed == training_mode_service
@@ -231,7 +236,7 @@ def test_create_broadcast_message_can_be_created_from_content(admin_request, sam
     response = admin_request.post(
         'broadcast_message.create_broadcast_message',
         _data={
-            'content': 'Some tailor made broadcast content',
+            'content': 'Some content\r\n€ŷŵ~\r\n‘’“”—–-',
             'reference': 'abc123',
             'service_id': str(sample_broadcast_service.id),
             'created_by': str(sample_broadcast_service.created_by_id),
@@ -239,7 +244,7 @@ def test_create_broadcast_message_can_be_created_from_content(admin_request, sam
         service_id=sample_broadcast_service.id,
         _expected_status=201
     )
-    assert response['content'] == 'Some tailor made broadcast content'
+    assert response['content'] == 'Some content\n€ŷŵ~\n\'\'""---'
     assert response['reference'] == 'abc123'
     assert response['template_id'] is None