This is the implementation of "Add email template text to Contact Participants page"

accounts/models.py

@@ -673,13 +673,16 @@ def send_announcement_email(cls, user: User, study, children):
         return announcement_message
 
     def send_as_email(self):
+        lab_email = self.related_study.lab.contact_email
+
         context = {
             "base_url": settings.BASE_URL,
             "custom_message": mark_safe(self.body),
+            "lab_name": self.related_study.lab.name,
+            "lab_email": lab_email,
+            "study_name": self.related_study.name,
         }
 
-        lab_email = self.related_study.lab.contact_email
-
         recipient_email_list = list(self.recipients.values_list("username", flat=True))
 
         for to_email in recipient_email_list:

studies/templates/emails/custom_email.html

@@ -1,5 +1,6 @@
 {% extends "emails/base.html" %}
 {% block content %}
+    {% include "emails/custom_email_header.html" %}
     {% autoescape off %}
         {{ custom_message }}
     {% endautoescape %}

studies/templates/emails/custom_email.txt

@@ -1,4 +1,6 @@
 {% extends "emails/base.txt" %}
+
 {% block content %}
+{% include "emails/custom_email_header.txt"  %}
 {{ custom_message|striptags }}
 {% endblock content %}

studies/templates/emails/custom_email_header.html

@@ -0,0 +1 @@
+<p>{% include "emails/custom_email_header.txt" %}</p>

studies/templates/emails/custom_email_header.txt

@@ -0,0 +1 @@
+This is an email from {{ lab_name }} for "{{ study_name }}". You may reply to this email to message directly with the researchers at {{ lab_name }} or email them at {{ lab_email }} if you have other questions.

studies/templates/studies/study_participant_contact.html

@@ -143,6 +143,15 @@
                     </div>
                 </div>
             </div>
+            <div class="card bg-light mb-3">
+                <div class="card-header">Email Header</div>
+                <div class="card-body">
+                    <p>All particiapant emails will see the following header when they're contacted from this form:</p>
+                    <i>
+                        {% include "emails/custom_email_header.html" with lab_name=study.lab.name study_name=study.name lab_email=study.lab.contact_email %}
+                    </i>
+                </div>
+            </div>
             <form method="post">
                 {% csrf_token %}
                 {% bootstrap_form form %}

studies/tests.py

@@ -596,7 +596,13 @@ def test_potential_message_targets_external(self):
 
 class TestSendMail(TestCase):
     def setUp(self):
-        self.context = {"token": G(User).generate_token(), "username": "username"}
+        self.context = {
+            "token": G(User).generate_token(),
+            "username": "username",
+            "lab_email": "lab_email",
+            "study_name": "study_name",
+            "lab_name": "lab_name",
+        }
 
     def test_send_email_with_image(self):
         email = send_mail(
@@ -613,9 +619,8 @@ def test_send_email_with_image(self):
         self.assertEqual(email.subject, "Test email")
         self.assertEqual(email.to, ["[email protected]"])
         self.assertTrue(
-            email.body.startswith(
-                "\nline 1[IMAGE]line 2\n\n\nUpdate your email preferences here"
-            ),
+            "\nline 1[IMAGE]line 2\n\n\nUpdate your email preferences here"
+            in email.body,
             "Email plain text does not have expected substitution of [IMAGE] for image tag",
         )
         self.assertEqual(
@@ -627,7 +632,7 @@ def test_send_email_with_image(self):
         self.assertEqual(
             email.alternatives[0],
             (
-                f'\n    \n        <p>line 1<br></p><p><img style="width: 24px;" src="cid:image-00001" data-filename="small.jpg"></p><p>line 2<br></p>\n    \n\n<br />\n<a href="https://localhost:8000/account/email/">Update your email preferences</a>\n<a href="https://localhost:8000/account/{self.context["username"]}/{self.context["token"]}/">Unsubscribe from all emails</a>\n',
+                f'\n    <p>This is an email from {self.context["lab_name"]} for "{self.context["study_name"]}". You may reply to this email to message directly with the researchers at {self.context["lab_name"]} or email them at {self.context["lab_email"]} if you have other questions.\n</p>\n\n    \n        <p>line 1<br></p><p><img style="width: 24px;" src="cid:image-00001" data-filename="small.jpg"></p><p>line 2<br></p>\n    \n\n<br />\n<a href="https://localhost:8000/account/email/">Update your email preferences</a>\n<a href="https://localhost:8000/account/{self.context["username"]}/{self.context["token"]}/">Unsubscribe from all emails</a>\n',
                 "text/html",
             ),
         )