Link back to uploaded letters page

If you’ve come to look at a notification via the uploaded letters page
then the ‘< back’ link should take you back there, not to the usual
activity page.

app/main/views/jobs.py

@@ -1,5 +1,7 @@
 # -*- coding: utf-8 -*-
 
+from functools import partial
+
 from flask import (
     Response,
     abort,
@@ -289,6 +291,11 @@ def get_notifications(service_id, message_type, status_override=None):
             status=request.args.get('status'),
             message_type=message_type,
             download_link=download_link,
+            single_notification_url=partial(
+                url_for,
+                '.view_notification',
+                service_id=current_service.id,
+            )
         ),
     }
 

app/main/views/notifications.py

@@ -120,6 +120,12 @@ def view_notification(service_id, notification_id):
             service_id=current_service.id,
             job_id=request.args.get('from_job'),
         )
+    elif request.args.get('from_uploaded_letters'):
+        back_link = url_for(
+            'main.uploaded_letters',
+            service_id=current_service.id,
+            letter_print_day=request.args.get('from_uploaded_letters'),
+        )
     else:
         back_link = url_for(
             'main.view_notifications',

app/main/views/uploads.py

@@ -4,6 +4,7 @@ import json
 import urllib
 import uuid
 from datetime import datetime
+from functools import partial
 from io import BytesIO
 from zipfile import BadZipFile
 
@@ -126,6 +127,12 @@ def uploaded_letters(service_id, letter_print_day):
             letter_print_day,
         ),
         letter_print_day=letter_print_day,
+        single_notification_url=partial(
+            url_for,
+            '.view_notification',
+            service_id=current_service.id,
+            from_uploaded_letters=letter_print_day,
+        )
     )