Template email subject lines

src/registrar/models/domain_application.py

@@ -476,6 +476,7 @@ class DomainApplication(TimeStampedModel):
         try:
             send_templated_email(
                 "emails/submission_confirmation.txt",
+                "emails/submission_confirmation.subject.txt",
                 self.submitter.email,
                 context={"id": self.id, "domain_name": self.requested_domain.name},
             )

src/registrar/templates/emails/domain_invitation.subject.txt

@@ -0,0 +1 @@
+You are invited to manage {{ domain.name }} on get.gov

src/registrar/templates/emails/submission_confirmation.subject.txt

@@ -0,0 +1 @@
+Thank you for applying for a .gov domain

src/registrar/utility/email.py

@@ -13,16 +13,22 @@ class EmailSendingError(RuntimeError):
     pass
 
 
-def send_templated_email(template_name: str, to_address: str, context={}):
+def send_templated_email(
+    template_name: str, subject_template_name: str, to_address: str, context={}
+):
     """Send an email built from a template to one email address.
 
-    template_name is relative to the same template context as Django's HTML
+    template_name and subject_template_name are relative to the same template
-    templates. context gives additional information that the template may use.
+    context as Django's HTML templates. context gives additional information
+    that the template may use.
     """
 
     template = get_template(template_name)
     email_body = template.render(context=context)
 
+    subject_template = get_template(subject_template_name)
+    subject = subject_template.render(context=context)
+
     try:
         ses_client = boto3.client(
             "sesv2",
@@ -40,7 +46,7 @@ def send_templated_email(template_name: str, to_address: str, context={}):
             Destination={"ToAddresses": [to_address]},
             Content={
                 "Simple": {
-                    "Subject": {"Data": "Thank you for applying for a .gov domain"},
+                    "Subject": {"Data": subject},
                     "Body": {"Text": {"Data": email_body}},
                 },
             },

src/registrar/views/domain.py

@@ -79,8 +79,12 @@ class DomainAddUserView(DomainPermission, FormMixin, DetailView):
             try:
                 send_templated_email(
                     "emails/domain_invitation.txt",
+                    "emails/domain_invitation.subject.txt",
                     to_address=email_address,
-                    context={"domain_url": self._domain_abs_url()},
+                    context={
+                        "domain_url": self._domain_abs_url(),
+                        "domain": self.object,
+                    },
                 )
             except EmailSendingError:
                 messages.warning(self.request, "Could not send email invitation.")