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from django.template.loader import get_template
from django.conf import settings
from datetime import timedelta
import os
import hmac
import hashlib
import re
import base64
from email.utils import formatdate
from email.utils import make_msgid
from pgweb.mailqueue.util import send_simple_mail
def _get_contenttype_from_extension(f):
_map = {
'png': 'image/png',
'jpg': 'image/jpeg',
}
e = os.path.splitext(f)[1][1:]
if e not in _map:
raise Exception("Unknown extension {}".format(e))
return _map[e]
def render_news_template(news):
# To generate HTML email, pick a template based on the organisation and render it.
html = get_template('news/mail/{}.html'.format(news.org.mailtemplate)).render({
'news': news,
})
# Enumerate all files for this template, if any
attachments = []
basedir = os.path.abspath(os.path.join(settings.PROJECT_ROOT, '../templates/news/mail/img.{}'.format(news.org.mailtemplate)))
if os.path.isdir(basedir):
for f in os.listdir(basedir):
a = {
'mimetype': _get_contenttype_from_extension(f),
'contenttype': '{}; name={}'.format(_get_contenttype_from_extension(f), f),
'filename': f,
'disposition': 'inline; filename="{}"'.format(f),
'id': '<{}>'.format(f),
}
with open(os.path.join(basedir, f), "rb") as f:
a['content'] = f.read()
attachments.append(a)
return html, attachments
_re_img = re.compile(r'(<img[^>]+src=")(cid:[^"]+)("[^>]+>)', re.I)
def embed_images_in_html(html, attachments):
amap = {a['filename']: a for a in attachments}
def _replace_cid_reference(t):
a = amap[t.group(2).replace('cid:', '')]
datasrc = 'data:{};base64,{}'.format(a['mimetype'], base64.b64encode(a['content']).decode('ascii'))
return t.group(1) + datasrc + t.group(3)
return _re_img.sub(_replace_cid_reference, html)
def send_news_email(news):
html, attachments = render_news_template(news)
messageid = make_msgid()
# If configured to, add the tags and sign them so that a pglister delivery system can filter
# recipients based on it.
if settings.NEWS_MAIL_TAGKEY:
date = formatdate(localtime=True)
tagstr = ",".join([t.urlname for t in news.tags.all()])
h = hmac.new(
settings.NEWS_MAIL_TAGKEY.encode('ascii'),
tagstr.encode('ascii') + messageid.encode('ascii') + date.encode('ascii'),
hashlib.sha256
)
headers = {
'X-pglister-tags': tagstr,
'X-pglister-tagsig': h.hexdigest(),
'Date': date,
}
else:
headers = {}
send_simple_mail(
settings.NEWS_MAIL_SENDER,
settings.NEWS_MAIL_RECEIVER,
news.title,
news.content,
replyto=news.email.address,
sendername=news.sentfrom,
receivername=settings.NEWS_MAIL_RECEIVER_NAME,
messageid=messageid,
htmlbody=html,
attachments=attachments,
headers=headers,
staggertype='news',
stagger=timedelta(minutes=30),
)
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