misc: add property to get submission agent (#34708)

tests/test_formdata.py

@@ -110,25 +110,28 @@ def test_manual_display_id(pub):
     assert substvars.get('form_number_raw') == str(formdata.id)
 
 
-def test_submission_context(pub):
+def test_submission_context(pub, local_user):
     formdef.data_class().wipe()
     formdata = formdef.data_class()()
     formdata.backoffice_submission = True
     formdata.submission_channel = 'mail'
     formdata.submission_context = {
         'mail_url': 'http://www.example.com/test.pdf',
+        'agent_id': local_user.id,
     }
     substvars = formdata.get_substitution_variables()
     assert substvars.get('form_submission_backoffice') is True
     assert substvars.get('form_submission_channel') == 'mail'
     assert substvars.get('form_submission_channel_label') == 'Mail'
     assert substvars.get('form_submission_context_mail_url') == 'http://www.example.com/test.pdf'
+    assert substvars.get('form_submission_agent_email') == local_user.email
 
     formdata = formdef.data_class()()
     substvars = formdata.get_substitution_variables()
     assert substvars.get('form_submission_backoffice') is False
     assert substvars.get('form_submission_channel') is None
     assert substvars.get('form_submission_channel_label') == 'Web'
+    assert substvars.get('form_submission_agent_email') is None
 
 
 def test_just_created(pub):

wcs/variables.py

@@ -313,6 +313,13 @@ class LazyFormData(LazyFormDef):
     def submission_channel_label(self):
         return self._formdata.get_submission_channel_label()
 
+    @property
+    def submission_agent(self):
+        try:
+            return LazyUser(get_publisher().user_class.get(self._formdata.submission_context['agent_id']))
+        except (TypeError, KeyError):
+            return None
+
     @property
     def submission_context(self):
         return self._formdata.submission_context