add new endpoints for one-off flow

rather than creating a job, after entering the placeholders, you now
send a single notification. This means we don't clog up s3 by creating
lots of one line CSV files.

app/main/views/send.py

@@ -225,7 +225,11 @@ def send_test_step(service_id, template_id, step_index):
         current_placeholder = placeholders[step_index]
     except IndexError:
         if all_placeholders_in_session(placeholders):
-            return make_and_upload_csv_file(service_id, template)
+            return redirect(url_for(
+                'main.send_notification',
+                service_id=service_id,
+                template_id=template_id,
+            ))
         return redirect(url_for(
             {
                 'main.send_test_step': '.send_test',
@@ -248,7 +252,11 @@ def send_test_step(service_id, template_id, step_index):
         session['send_test_values'][current_placeholder] = form.placeholder_value.data
 
         if all_placeholders_in_session(placeholders):
-            return make_and_upload_csv_file(service_id, template)
+            return redirect(url_for(
+                'main.send_notification',
+                service_id=service_id,
+                template_id=template_id,
+            ))
 
         return redirect(url_for(
             request.endpoint,
@@ -567,3 +575,53 @@ def get_back_link(service_id, template_id, step_index):
             template_id=template_id,
             step_index=step_index - 1,
         )
+
+
+@main.route("/services/<service_id>/template/<template_id>/notification/check", methods=['GET'])
+@login_required
+@user_has_permissions('manage_templates')
+def check_notification(service_id, template_id):
+    # go back to start of process
+    back_link = get_back_link(service_id, template_id, 0)
+
+    db_template = service_api_client.get_service_template(service_id, template_id)['data']
+    template = get_template(
+        db_template,
+        current_service,
+        show_recipient=True,
+        letter_preview_url='FUCK WHAT DO I DO HERE'
+    )
+
+    return render_template(
+        'views/notifications/check.html',
+        template=template,
+        back_link=back_link,
+        help=get_help_argument(),
+    )
+
+
+@main.route("/services/<service_id>/template/<template_id>/notification/check", methods=['POST'])
+@login_required
+@user_has_permissions('manage_templates')
+def send_notification(service_id, template_id):
+    if 'send_test_values' not in session.keys():
+        return redirect(url_for(
+            '.send_one_off',
+            service_id=service_id,
+            template_id=template_id,
+        ))
+
+    noti = notification_api_client.send_notification(
+        service_id,
+        template_id=template_id,
+        recipient=next(x for x in session['send_test_values'].values()),
+        personalisation=None
+    )
+
+    session.pop('send_test_values')
+
+    return redirect(url_for(
+        '.view_notification',
+        service_id=service_id,
+        notification_id=noti['id']
+    ))

app/templates/views/notifications/check.html

@@ -0,0 +1,34 @@
+{% extends "withnav_template.html" %}
+<!-- {% from "components/banner.html" import banner_wrapper %} -->
+<!-- {% from "components/table.html" import list_table, field, text_field, index_field, hidden_field_heading %} -->
+<!-- {% from "components/file-upload.html" import file_upload %} -->
+<!-- {% from "components/page-footer.html" import page_footer %} -->
+{% from "components/radios.html" import radio_select %}
+{% from "components/message-count-label.html" import message_count_label %}
+
+{% block service_page_title %}
+  {{ "Error" if errors else "Preview" }}
+{% endblock %}
+
+{% block maincolumn_content %}
+
+  <h1 class="heading-large">
+    Preview of {{ template.name }}
+  </h1>
+
+  {{ template|string }}
+
+  <div class="bottom-gutter-3-2">
+    <form method="post" enctype="multipart/form-data" action="{{url_for('main.send_notification', service_id=current_service.id, template_id=template.id)}}" class='page-footer'>
+      <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
+      <input type="hidden" name="help" value="{{ '3' if help else 0 }}" />
+      {% if template.template_type != 'letter' or not request.args.from_test %}
+      <input type="submit" class="button" value="Send 1 {{ message_count_label(1, template.template_type, suffix='') }}" />
+      {% else %}
+        <a href="{{ url_for('main.check_messages_preview', service_id=current_service.id, template_type=template.template_type, upload_id=upload_id, filetype='pdf') }}" download="download" class="button">Download as a printable PDF</a>
+      {% endif %}
+      <a href="{{ back_link }}" class="page-footer-back-link">Back</a>
+    </form>
+  </div>
+
+{% endblock %}