Accept CAP XML

This commit makes the existing endpoint also accept CAP XML, should the
appropriate `Content-Type` header be set.

It uses the translation code we added in a previous commit to convert
the CAP to a dict. We can then validate that dict against with the JSON
schema to ensure it’s something we can work with.

tests/app/v2/broadcast/test_post_broadcast.py

@@ -2,6 +2,7 @@ from flask import json
 from freezegun import freeze_time
 from tests import create_authorization_header
 from unittest.mock import ANY
+from . import sample_cap_xml_documents
 
 
 def test_broadcast_for_service_without_permission_returns_400(
@@ -73,3 +74,51 @@ def test_valid_post_broadcast_returns_201(
     assert response_json['template_name'] is None
     assert response_json['template_version'] is None
     assert response_json['updated_at'] is None
+
+
+def test_valid_post_cap_xml_broadcast_returns_201(
+    client,
+    sample_broadcast_service,
+):
+    auth_header = create_authorization_header(service_id=sample_broadcast_service.id)
+
+    response = client.post(
+        path='/v2/broadcast',
+        data=sample_cap_xml_documents.WAINFLEET,
+        headers=[('Content-Type', 'application/cap+xml'), auth_header],
+    )
+
+    assert response.status_code == 201
+
+    response_json = json.loads(response.get_data(as_text=True))
+
+    assert response_json['approved_at'] is None
+    assert response_json['approved_by_id'] == None
+    assert response_json['areas'] == [
+        'River Steeping in Wainfleet All Saints'
+    ]
+    assert response_json['cancelled_at'] == None
+    assert response_json['cancelled_by_id'] == None
+    assert response_json['content'].startswith(
+        'A severe flood warning has been issued. Storm Dennis'
+    )
+    assert response_json['content'].endswith(
+        'closely monitoring the situation throughout the night. '
+    )
+    assert response_json['reference'] == '50385fcb0ab7aa447bbd46d848ce8466E'
+    assert response_json['created_at']  # datetime generated by the DB so can’t freeze it
+    assert response_json['created_by_id'] == None
+    assert response_json['finishes_at'] is None
+    assert response_json['id'] == ANY
+    assert response_json['personalisation'] is None
+    assert response_json['service_id'] == str(sample_broadcast_service.id)
+    assert len(response_json['simple_polygons']) == 1
+    assert len(response_json['simple_polygons'][0]) == 29
+    assert response_json['simple_polygons'][0][0] == [53.10569, 0.24453]
+    assert response_json['simple_polygons'][0][-1] == [53.10569, 0.24453]
+    assert response_json['starts_at'] is None
+    assert response_json['status'] == 'pending-approval'
+    assert response_json['template_id'] is None
+    assert response_json['template_name'] is None
+    assert response_json['template_version'] is None
+    assert response_json['updated_at'] is None