fix: Improve validation for form that accepts pasted email feedback (#5761)

* test: Test paste-email-feedback-form with missing headers and/or body

* fix: Don't crash if paste-email-feedback-form doesn't contain a Subject line

* test: Test that paste-email-feedback-form requires headers

* fix: If email headers are missing, prompt the user to try again

* chore: retrigger PR checks

ietf/nomcom/tests.py

@@ -99,6 +99,7 @@ class NomcomViewsTest(TestCase):
         self.private_nominate_newperson_url = reverse('ietf.nomcom.views.private_nominate_newperson', kwargs={'year': self.year})
         self.add_questionnaire_url = reverse('ietf.nomcom.views.private_questionnaire', kwargs={'year': self.year})
         self.private_feedback_url = reverse('ietf.nomcom.views.private_feedback', kwargs={'year': self.year})
+        self.private_feedback_email_url = reverse('ietf.nomcom.views.private_feedback_email', kwargs={'year': self.year})
         self.positions_url = reverse('ietf.nomcom.views.list_positions', kwargs={'year': self.year})        
         self.edit_position_url = reverse('ietf.nomcom.views.edit_position', kwargs={'year': self.year})
 
@@ -1012,6 +1013,43 @@ class NomcomViewsTest(TestCase):
             nominee_position.save()
 
 
+    def test_private_feedback_email(self):
+        self.access_chair_url(self.private_feedback_email_url)
+
+        feedback_url = self.private_feedback_email_url
+        response = self.client.get(feedback_url)
+        self.assertEqual(response.status_code, 200)
+
+        nomcom = get_nomcom_by_year(self.year)
+        if not nomcom.public_key:
+            self.assertNotContains(response, "paste-email-feedback-form")
+
+        # save the cert file in tmp
+        with io.open(self.cert_file.name, 'r') as fd:
+            nomcom.public_key.save('cert', File(fd))
+
+        response = self.client.get(feedback_url)
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, "paste-email-feedback-form")
+
+        headers = \
+            "From: Zaphod Beeblebrox <president@galaxy>\n" \
+            "Subject: Ford Prefect\n\n"
+        body = \
+            "Hey, you sass that hoopy Ford Prefect?\n" \
+            "There's a frood who really knows where his towel is.\n"
+
+        test_data = {'email_text': body}
+        response = self.client.post(feedback_url, test_data)
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, 'Missing email headers')
+
+        test_data = {'email_text': headers + body}
+        response = self.client.post(feedback_url, test_data)
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, 'The feedback email has been registered.')
+
+
 class NomineePositionStateSaveTest(TestCase):
     """Tests for the NomineePosition save override method"""
 

ietf/nomcom/utils.py

@@ -12,6 +12,7 @@ import tempfile
 
 from collections import defaultdict
 from email import message_from_string, message_from_bytes
+from email.errors import HeaderParseError
 from email.header import decode_header
 from email.iterators import typed_subpart_iterator
 from email.utils import parseaddr
@@ -442,7 +443,11 @@ def make_nomineeposition_for_newperson(nomcom, candidate_name, candidate_email,
 def getheader(header_text, default="utf-8"):
     """Decode the specified header"""
 
+    try:
         tuples = decode_header(header_text)
+    except TypeError:
+        return ""
+
     header_sections = [ text.decode(charset or default) if isinstance(text, bytes) else text for text, charset in tuples]
     return "".join(header_sections)
 
@@ -491,6 +496,9 @@ def parse_email(text):
     body = get_body(msg)
     subject = getheader(msg['Subject'])
     __, addr = parseaddr(msg['From'])
+    if not addr:
+        raise HeaderParseError
+
     return addr.lower(), subject, body
 
 

ietf/nomcom/views.py

@@ -20,6 +20,7 @@ from django.template.loader import render_to_string
 from django.urls import reverse
 from django.utils.encoding import force_bytes, force_str
 
+from email.errors import HeaderParseError
 
 from ietf.dbtemplate.models import DBTemplate
 from ietf.dbtemplate.views import group_template_edit, group_template_show
@@ -652,9 +653,12 @@ def private_feedback_email(request, year):
         form = FeedbackEmailForm(data=request.POST,
                                  nomcom=nomcom)
         if form.is_valid():
+            try:
                 form.save()
                 form = FeedbackEmailForm(nomcom=nomcom)
                 messages.success(request, 'The feedback email has been registered.')
+            except HeaderParseError:
+                messages.error(request, 'Missing email headers')
 
     return render(request, template,
                               {'form': form,