Make a service model and use for permissions

Having the service floating about as JSON is a bit flakey. Could easily
introduce a mistake where you mistype the name of a key and silently
get `None`.

Also means doing awkward things like `if 'permission' in
current_service['permissions']`, whereas for users we can do the
much cleaner `user.has_permission()`.

So this commit:
- introduces a model
- adds a `.has_permission` method similar to the one we have for users

app/main/views/api_keys.py

@@ -37,7 +37,7 @@ dummy_bearer_token = 'bearer_token_set'
 @user_has_permissions('manage_api_keys')
 def api_integration(service_id):
     callbacks_link = (
-        '.api_callbacks' if 'inbound_sms' in current_service['permissions']
+        '.api_callbacks' if current_service.has_permission('inbound_sms')
         else '.delivery_status_callback'
     )
     return render_template(
@@ -104,7 +104,7 @@ def create_api_key(service_id):
             'Not available because your service is in '
             '<a href="{}#trial-mode">trial mode</a>'.format(url_for(".using_notify"))
         )
-    if 'letter' in current_service['permissions']:
+    if current_service.has_permission('letter'):
         option_hints[KEY_TYPE_TEAM] = 'Can’t be used to send letters'
     if form.validate_on_submit():
         if form.key_type.data in disabled_options:
@@ -198,7 +198,7 @@ def get_delivery_status_callback_details():
 def delivery_status_callback(service_id):
     delivery_status_callback = get_delivery_status_callback_details()
     back_link = (
-        '.api_callbacks' if 'inbound_sms' in current_service['permissions']
+        '.api_callbacks' if current_service.has_permission('inbound_sms')
         else '.api_integration'
     )
 

app/main/views/dashboard.py

@@ -152,7 +152,7 @@ def usage(service_id):
     yearly_usage = billing_api_client.get_service_usage_ft(service_id, year)
 
     usage_template = 'views/usage.html'
-    if 'letter' in current_service['permissions']:
+    if current_service.has_permission('letter'):
         usage_template = 'views/usage-with-letters.html'
     return render_template(
         usage_template,
@@ -293,7 +293,7 @@ def get_dashboard_partials(service_id):
     stats = service_api_client.get_service_statistics(service_id, today_only=False)
     column_width, max_notifiction_count = get_column_properties(
         number_of_columns=(
-            3 if 'letter' in current_service['permissions'] else 2
+            3 if current_service.has_permission('letter') else 2
         )
     )
     dashboard_totals = get_dashboard_totals(stats),
@@ -313,7 +313,7 @@ def get_dashboard_partials(service_id):
             'views/dashboard/_inbox.html',
             inbound_sms_summary=(
                 service_api_client.get_inbound_sms_summary(service_id)
-                if 'inbound_sms' in current_service['permissions'] else None
+                if current_service.has_permission('inbound_sms') else None
             ),
         ),
         'totals': render_template(

app/main/views/manage_users.py

@@ -48,14 +48,14 @@ def manage_users(service_id):
 @user_has_permissions('manage_service')
 def invite_user(service_id):
 
-    if 'caseworking' in current_service['permissions']:
+    if current_service.has_permission('caseworking'):
         form = CaseworkingInviteUserForm
     else:
         form = AdminInviteUserForm
 
     form = form(invalid_email_address=current_user.email_address)
 
-    service_has_email_auth = 'email_auth' in current_service['permissions']
+    service_has_email_auth = current_service.has_permission('email_auth')
     if not service_has_email_auth:
         form.login_authentication.data = 'sms_auth'
 
@@ -83,13 +83,13 @@ def invite_user(service_id):
 @login_required
 @user_has_permissions('manage_service')
 def edit_user_permissions(service_id, user_id):
-    service_has_email_auth = 'email_auth' in current_service['permissions']
+    service_has_email_auth = current_service.has_permission('email_auth')
     # TODO we should probably using the service id here in the get user
     # call as well. eg. /user/<user_id>?&service=service_id
     user = user_api_client.get_user(user_id)
     user_has_no_mobile_number = user.mobile_number is None
 
-    if 'caseworking' in current_service['permissions']:
+    if current_service.has_permission('caseworking'):
         form = partial(
             CaseworkingPermissionsForm,
             user_type='admin' if user.has_permission_for_service(service_id, 'view_activity') else 'caseworker',

app/main/views/notifications.py

@@ -91,7 +91,7 @@ def view_notification(service_id, notification_id):
         help=get_help_argument(),
         estimated_letter_delivery_date=get_letter_timings(notification['created_at']).earliest_delivery,
         notification_id=notification['id'],
-        can_receive_inbound=('inbound_sms' in current_service['permissions']),
+        can_receive_inbound=(current_service.has_permission('inbound_sms')),
         is_precompiled_letter=notification['template']['is_precompiled_letter']
     )
 

app/main/views/send.py

@@ -401,7 +401,7 @@ def send_test_step(service_id, template_id, step_index):
         dict_to_populate_from=get_normalised_placeholders_from_session(),
         template_type=template.template_type,
         optional_placeholder=optional_placeholder,
-        allow_international_phone_numbers='international_sms' in current_service['permissions'],
+        allow_international_phone_numbers=current_service.has_permission('international_sms'),
     )
 
     if form.validate_on_submit():
@@ -551,7 +551,7 @@ def _check_messages(service_id, template_id, upload_id, preview_row, letters_as_
             [user.name, user.mobile_number, user.email_address] for user in users
         ) if current_service['restricted'] else None,
         remaining_messages=remaining_messages,
-        international_sms='international_sms' in current_service['permissions'],
+        international_sms=current_service.has_permission('international_sms'),
     )
 
     if request.args.get('from_test'):

app/main/views/service_settings.py

@@ -93,7 +93,7 @@ def service_settings(service_id):
         letter_branding=letter_branding_organisations.get(
             current_service.get('dvla_organisation', '001')
         ),
-        can_receive_inbound=('inbound_sms' in current_service['permissions']),
+        can_receive_inbound=(current_service.has_permission('inbound_sms')),
         inbound_number=disp_inbound_number,
         default_reply_to_email_address=default_reply_to_email_address,
         reply_to_email_address_count=reply_to_email_address_count,
@@ -289,9 +289,7 @@ def force_service_permission(service_id, permission, on=False, sms_sender=None):
 
 def update_service_permissions(service_id, permissions, sms_sender=None):
 
-    current_service['permissions'] = list(permissions)
-
-    data = {'permissions': current_service['permissions']}
+    data = {'permissions': list(permissions)}
 
     if sms_sender:
         data['sms_sender'] = sms_sender
@@ -339,7 +337,7 @@ def service_switch_can_upload_document(service_id):
 
     # If turning the permission off, or turning it on and the service already has a contact_link,
     # don't show the form to add the link
-    if 'upload_document' in current_service['permissions'] or current_service.get('contact_link'):
+    if current_service.has_permission('upload_document') or current_service.get('contact_link'):
         switch_service_permissions(service_id, 'upload_document')
         return redirect(url_for('.service_settings', service_id=service_id))
 
@@ -569,7 +567,7 @@ def service_set_sms_prefix(service_id):
 @user_has_permissions('manage_service')
 def service_set_international_sms(service_id):
     form = InternationalSMSForm(
-        enabled='on' if 'international_sms' in current_service['permissions'] else 'off'
+        enabled='on' if current_service.has_permission('international_sms') else 'off'
     )
     if form.validate_on_submit():
         force_service_permission(
@@ -602,7 +600,7 @@ def service_set_inbound_sms(service_id):
 @user_has_permissions('manage_service')
 def service_set_letters(service_id):
     form = ServiceSwitchLettersForm(
-        enabled='on' if 'letter' in current_service['permissions'] else 'off'
+        enabled='on' if current_service.has_permission('letter') else 'off'
     )
     if form.validate_on_submit():
         force_service_permission(
@@ -640,7 +638,7 @@ def service_set_basic_view(service_id):
         abort(403)
 
     form = ServiceBasicViewForm(
-        enabled='caseworking' in current_service['permissions']
+        enabled=current_service.has_permission('caseworking')
     )
     if form.validate_on_submit():
         force_service_permission(

app/main/views/templates.py

@@ -108,7 +108,7 @@ def choose_template(service_id, template_type='all'):
     templates = service_api_client.get_service_templates(service_id)['data']
 
     letters_available = (
-        'letter' in current_service['permissions'] and
+        current_service.has_permission('letter') and
         current_user.has_permissions('view_activity')
     )
 
@@ -207,9 +207,9 @@ def view_template_version_preview(service_id, template_id, version, filetype):
 def add_template_by_type(service_id):
 
     form = ChooseTemplateType(
-        include_letters='letter' in current_service['permissions'],
+        include_letters=current_service.has_permission('letter'),
         include_copy=any((
-            service_api_client.count_service_templates(service_id),
+            service_api_client.count_service_templates(service_id) > 0,
             len(user_api_client.get_service_ids_for_user(current_user)) > 1,
         )),
     )
@@ -672,5 +672,5 @@ def get_human_readable_delta(from_time, until_time):
 def should_show_template(template_type):
     return (
         template_type != 'letter' or
-        'letter' in current_service['permissions']
+        current_service.has_permission('letter')
     )