Add endpoint to redirect from contact list to send

In order to use a contact list we’re going to put you in the normal
upload a spreadsheet journey. Except without having to upload again.

So this commit adds an endpoint that takes the file from the contact
list bucket, puts it in the same place it would have gone if you’d
uploaded it, then sends you on your way.

tests/app/main/views/test_send.py

@@ -6,6 +6,7 @@ from glob import glob
 from io import BytesIO
 from itertools import repeat
 from os import path
+from unittest.mock import ANY
 from uuid import uuid4
 from zipfile import BadZipFile
 
@@ -3780,3 +3781,43 @@ def test_redirects_to_template_if_job_exists_already(
             _external=True,
         )
     )
+
+
+def test_send_from_contact_list(
+    mocker,
+    client_request,
+    fake_uuid,
+):
+    new_uuid = uuid.uuid4()
+    mock_download = mocker.patch('app.models.contact_list.s3download', return_value='contents')
+    mock_get_metadata = mocker.patch('app.models.contact_list.get_csv_metadata', return_value={
+        'example_key': 'example value',
+    })
+    mock_upload = mocker.patch('app.models.contact_list.s3upload', return_value=new_uuid)
+    mock_set_metadata = mocker.patch('app.models.contact_list.set_metadata_on_csv_upload')
+    client_request.get(
+        'main.send_from_contact_list',
+        service_id=SERVICE_ONE_ID,
+        template_id=fake_uuid,
+        contact_list_id=fake_uuid,
+        _expected_status=302,
+        _expected_redirect=url_for(
+            'main.check_messages',
+            service_id=SERVICE_ONE_ID,
+            template_id=fake_uuid,
+            upload_id=new_uuid,
+            _external=True,
+        )
+    )
+    mock_download.assert_called_once_with(
+        SERVICE_ONE_ID, fake_uuid, bucket='test-contact-list'
+    )
+    mock_get_metadata.assert_called_once_with(
+        SERVICE_ONE_ID, fake_uuid, bucket='test-contact-list'
+    )
+    mock_upload.assert_called_once_with(
+        SERVICE_ONE_ID, 'contents', ANY
+    )
+    mock_set_metadata.assert_called_once_with(
+        SERVICE_ONE_ID, new_uuid, example_key='example value'
+    )