Introduce send_template_mail

This introduces the function of the same name from the pgweb code base
(though it isn't identical, to be clear).  This function is to be used
when rendering a text file into an email.  There is a helper function
template_to_string() which is also added and can be used if a string
result is needed.

The primary different here is that the variables set in
util/context_processor:settings_context are included in the hash
automatically, so those settings do not need to be explicitly set by
the callers and the templates can expect them to be available.

Using that, this change also includes changes to move away from
hard-coded values like 'PostgreSQL Europe' in favor of using the
variables set in settings.py/local_settings.py in the text templates.
This will allow others to re-use the exisitng templates and not have
to develop and maintain their own going forward.

1 files changed, 15 insertions, 0 deletions

diff --git a/postgresqleu/mailqueue/util.py b/postgresqleu/mailqueue/util.py
index 2f616b66..19952ff9 100644
--- a/postgresqleu/mailqueue/util.py
+++ b/postgresqleu/mailqueue/util.py
@@ -4,8 +4,23 @@ from email.mime.nonmultipart import MIMENonMultipart
 from email.Utils import formatdate
 from email import encoders
 
+from postgresqleu.util.context_processors import settings_context
+
+from django.template import Context
+from django.template.loader import get_template
+
 from models import QueuedMail
 
+def template_to_string(templatename, attrs = {}):
+	context = Context(attrs)
+	context.update(settings_context())
+	return get_template(templatename).render(context)
+
+def send_template_mail(sender, receiver, subject, templatename, templateattr={}, attachments=None, bcc=None, sendername=None, receivername=None):
+	send_simple_mail(sender, receiver, subject,
+					 template_to_string(templatename, templateattr),
+					 attachments, bcc, sendername, receivername)
+
 def send_simple_mail(sender, receiver, subject, msgtxt, attachments=None, bcc=None, sendername=None, receivername=None):
 	# attachment format, each is a tuple of (name, mimetype,contents)
 	# content should be *binary* and not base64 encoded, since we need to