import os import mimetypes import logging from smtplib import SMTPException from django.utils.safestring import mark_safe logger = logging.getLogger('helpdesk') def send_templated_mail(template_name, context, recipients, sender=None, bcc=None, fail_silently=False, files=None, extra_headers={}): """ send_templated_mail() is a wrapper around Django's e-mail routines that allows us to easily send multipart (text/plain & text/html) e-mails using templates that are stored in the database. This lets the admin provide both a text and a HTML template for each message. template_name is the slug of the template to use for this message (see models.EmailTemplate) context is a dictionary to be used when rendering the template recipients can be either a string, eg 'a@b.com', or a list of strings. sender should contain a string, eg 'My Site '. If you leave it blank, it'll use settings.DEFAULT_FROM_EMAIL as a fallback. bcc is an optional list of addresses that will receive this message as a blind carbon copy. fail_silently is passed to Django's mail routine. Set to 'True' to ignore any errors at send time. files can be a list of tuples. Each tuple should be a filename to attach, along with the File objects to be read. files can be blank. extra_headers is a dictionary of extra email headers, needed to process email replies and keep proper threading. """ from django.core.mail import EmailMultiAlternatives from django.template import engines from_string = engines['django'].from_string from helpdesk.models import EmailTemplate from helpdesk.settings import HELPDESK_EMAIL_SUBJECT_TEMPLATE, \ HELPDESK_EMAIL_FALLBACK_LOCALE locale = context['queue'].get('locale') or HELPDESK_EMAIL_FALLBACK_LOCALE try: t = EmailTemplate.objects.get(template_name__iexact=template_name, locale=locale) except EmailTemplate.DoesNotExist: try: t = EmailTemplate.objects.get(template_name__iexact=template_name, locale__isnull=True) except EmailTemplate.DoesNotExist: logger.warning('template "%s" does not exist, no mail sent', template_name) return # just ignore if template doesn't exist subject_part = from_string( HELPDESK_EMAIL_SUBJECT_TEMPLATE % { "subject": t.subject }).render(context).replace('\n', '').replace('\r', '') footer_file = os.path.join('helpdesk', locale, 'email_text_footer.txt') text_part = from_string( "%s{%% include '%s' %%}" % (t.plain_text, footer_file) ).render(context) email_html_base_file = os.path.join('helpdesk', locale, 'email_html_base.html') # keep new lines in html emails if 'comment' in context: context['comment'] = mark_safe(context['comment'].replace('\r\n', '
')) html_part = from_string( "{%% extends '%s' %%}{%% block title %%}" "%s" "{%% endblock %%}{%% block content %%}%s{%% endblock %%}" % (email_html_base_file, t.heading, t.html) ).render(context) if isinstance(recipients, str): if recipients.find(','): recipients = recipients.split(',') elif type(recipients) != list: recipients = [recipients] msg = EmailMultiAlternatives(subject_part, text_part, sender or settings.DEFAULT_FROM_EMAIL, recipients, bcc=bcc) msg.attach_alternative(html_part, "text/html") if files: for filename, filefield in files: filefield.open('rb') content = filefield.read() msg.attach(filename, content) filefield.close() logger.debug('Sending email to: {!r}'.format(recipients)) try: return msg.send() except SMTPException as e: logger.exception('SMTPException raised while sending email to {}'.format(recipients)) if not fail_silently: raise e return 0