Allow platform admins to change rate limit

One less thing we have to go into the database to do, and remember to
manually clear the cache for after.

app/main/forms.py

@@ -1183,6 +1183,15 @@ class MessageLimit(StripWhitespaceForm):
     )
 
 
+class RateLimit(StripWhitespaceForm):
+    rate_limit = GovukIntegerField(
+        'Number of messages the service can send in a rolling 60 second window',
+        validators=[
+            DataRequired(message='Cannot be empty')
+        ]
+    )
+
+
 class ConfirmPasswordForm(StripWhitespaceForm):
     def __init__(self, validate_password_func, *args, **kwargs):
         self.validate_password_func = validate_password_func

app/main/views/service_settings.py

@@ -38,6 +38,7 @@ from app.main.forms import (
     LinkOrganisationsForm,
     MessageLimit,
     PreviewBranding,
+    RateLimit,
     RenameServiceForm,
     SearchByNameForm,
     ServiceContactDetailsForm,
@@ -956,6 +957,23 @@ def set_message_limit(service_id):
     )
 
 
+@main.route("/services/<uuid:service_id>/service-settings/set-rate-limit", methods=['GET', 'POST'])
+@user_is_platform_admin
+def set_rate_limit(service_id):
+
+    form = RateLimit(rate_limit=current_service.rate_limit)
+
+    if form.validate_on_submit():
+        current_service.update(rate_limit=form.rate_limit.data)
+
+        return redirect(url_for('.service_settings', service_id=service_id))
+
+    return render_template(
+        'views/service-settings/set-rate-limit.html',
+        form=form,
+    )
+
+
 @main.route("/services/<uuid:service_id>/service-settings/set-email-branding", methods=['GET', 'POST'])
 @user_is_platform_admin
 def service_set_email_branding(service_id):

app/models/service.py

@@ -37,6 +37,7 @@ class Service(JSONModel):
         'inbound_api',
         'letter_branding',
         'message_limit',
+        'rate_limit',
         'name',
         'prefix_sms',
         'research_mode',

app/navigation.py

@@ -317,6 +317,7 @@ class HeaderNavigation(Navigation):
         'services_or_dashboard',
         'set_free_sms_allowance',
         'set_message_limit',
+        'set_rate_limit',
         'set_sender',
         'set_template_sender',
         'show_accounts_or_dashboard',
@@ -505,6 +506,7 @@ class MainNavigation(Navigation):
             'service_sms_senders',
             'set_free_sms_allowance',
             'set_message_limit',
+            'set_rate_limit',
             'service_set_letter_branding',
             'submit_request_to_go_live',
         },
@@ -972,6 +974,7 @@ class CaseworkNavigation(Navigation):
         'services_or_dashboard',
         'set_free_sms_allowance',
         'set_message_limit',
+        'set_rate_limit',
         'service_set_letter_branding',
         'set_sender',
         'set_template_sender',
@@ -1285,6 +1288,7 @@ class OrgNavigation(Navigation):
         'services_or_dashboard',
         'set_free_sms_allowance',
         'set_message_limit',
+        'set_rate_limit',
         'service_set_letter_branding',
         'set_sender',
         'set_template_sender',

app/templates/views/service-settings.html

@@ -353,6 +353,11 @@
             {% endcall %}
             {{ edit_field('Change', url_for('.link_service_to_organisation', service_id=current_service.id), suffix='organisation for service') }}
           {% endcall %}
+          {% call row() %}
+            {{ text_field('Rate limit')}}
+            {{ text_field('{:,} per minute'.format(current_service.rate_limit)) }}
+            {{ edit_field('Change', url_for('.set_rate_limit', service_id=current_service.id), suffix='rate limit') }}
+          {% endcall %}
           {% call row() %}
             {{ text_field('Message limit')}}
             {{ text_field('{:,} per day'.format(current_service.message_limit)) }}

app/templates/views/service-settings/set-rate-limit.html

@@ -0,0 +1,21 @@
+{% extends "withnav_template.html" %}
+{% from "components/page-header.html" import page_header %}
+{% from "components/page-footer.html" import page_footer %}
+{% from "components/form.html" import form_wrapper %}
+
+{% block service_page_title %}
+  Set rate limit
+{% endblock %}
+
+{% block maincolumn_content %}
+
+  {% call form_wrapper() %}
+    {{ page_header(
+      'Rate limit',
+      back_link=url_for('.service_settings', service_id=current_service.id)
+    ) }}
+    {{ form.rate_limit }}
+    {{ page_footer('Save') }}
+  {% endcall %}
+
+{% endblock %}