spamotron/mailing.py

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#! /usr/bin/env python3
# (C) Olivier Berger 2001-2002
# (C) François Poulain 2019
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
#
# This program is used to mail a message to several recipients, thus
# providing customization for each recipient.
import argparse, csv, sys, re
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import smtplib, time, mimetypes
from email.header import Header
from email.message import EmailMessage
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def parse_args():
parser = argparse.ArgumentParser(description="Simple mailing script.")
ma = parser.add_argument_group(title="mandatory arguments", description=None)
ma.add_argument(
"-t",
"--tofile",
type=str,
required=True,
help="CSV file containing recipients data.",
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)
ma.add_argument(
"-b",
"--bodyfile",
metavar="BODY.FILE",
type=str,
required=True,
help="Template of the mail to be sent",
)
parser.add_argument(
"-d",
"--dry-run",
action="store_true",
help="Load data but don't send anything.",
)
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parser.add_argument(
"-v", "--verbose", action="store_true",
)
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parser.add_argument(
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"-a", "--attachement", type=str, nargs="+", help="Optionnal attachments.",
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)
return parser.parse_args()
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def read_recipients_datas(args):
with open(args.tofile) as csv_file:
csv_soup = csv.reader(csv_file)
first = [(s.split(":", 1)) for s in csv_soup.__next__()]
header = [
(h[0].strip().lower(), h[1].strip() if len(h) == 2 else None) for h in first
]
datas = [[s.strip() for s in d] for d in csv_soup]
full_datas = []
for data in datas:
try:
full_data = {
h[0]: data[i] if i < len(data) or not h[1] else h[1]
for i, h in enumerate(header)
}
full_datas.append(full_data)
except Exception:
print("Ligne mal renseignée:", data, file=sys.stderr)
return full_datas
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def read_body(args):
bodyfile = open(args.bodyfile)
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body = ""
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for line in bodyfile.readlines():
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body = body + line
return body
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def read_join(args):
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r = []
for attachement in args.attachement:
try:
with open(attachement, "rb") as fp:
ctype, encoding = mimetypes.guess_type(attachement)
if ctype is None or encoding is not None:
ctype = "application/octet-stream"
maintype, subtype = ctype.split("/", 1)
metadata = {
"filename": attachement,
"maintype": maintype,
"subtype": subtype,
}
r.append((fp.read(), metadata))
except Exception as e:
print("read error: %s" % e)
exit(1)
return r
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def replace_values(bodytemplate, values):
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body = bodytemplate
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for i in range(len(values)):
i = i + 1
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pattern = "${{%02d}}" % i
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body = body.replace(pattern, values[i - 1])
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return body
# patterns for header of the mail
FROMPATTERN = re.compile(r"^From: *(.*)")
SUBJECTPATTERN = re.compile(r"^Subject: *(.*)")
CCPATTERN = re.compile(r"^Cc: *(.*)")
BCCPATTERN = re.compile(r"^Bcc: *(.*)")
REPLYTOPATTERN = re.compile(r"^Reply-To: *(.*)")
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def qencode_subject(message):
subjectmatches = re.search(r"^Subject: *(.*)$", message, re.MULTILINE)
if subjectmatches == None:
return message
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subjectstr = subjectmatches.group(1)
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h = Header(subjectstr, "utf-8")
qsubjectstr = h.encode()
return message.replace(subjectstr, qsubjectstr, 1)
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def send_message(message, to, attachments, args):
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lines = message.split("\n")
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# identify headers in the template
fromvalue = None
subjectvalue = None
ccvalue = None
bccvalue = None
replytovalue = None
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for index, line in enumerate(lines):
if not line:
body = "\n".join(lines[index + 1 :])
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break
frommatches = FROMPATTERN.match(line)
subjectmatches = SUBJECTPATTERN.match(line)
ccmatches = CCPATTERN.match(line)
bccmatches = BCCPATTERN.match(line)
replytomatches = REPLYTOPATTERN.match(line)
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if frommatches:
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fromvalue = frommatches.group(1)
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if subjectmatches:
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subjectvalue = subjectmatches.group(1)
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if ccmatches:
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ccvalue = ccmatches.group(1)
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if bccmatches:
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bccvalue = bccmatches.group(1)
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if replytomatches:
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replytovalue = replytomatches.group(1)
# lists all addresses to which the mail will be sent
dests = [to]
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if ccvalue:
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dests.append(ccvalue)
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if bccvalue:
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dests.append(bccvalue)
msg = EmailMessage()
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msg["Subject"] = subjectvalue
msg["From"] = fromvalue
msg["To"] = to
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if replytovalue:
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msg["Reply-To"] = replytovalue
if ccvalue:
msg["Cc"] = ccvalue
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msg.set_content(body)
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if attachments:
for attachment in attachments:
msg.add_attachment(attachment[0], **attachment[1])
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if args.verbose:
print(msg)
print("-" * 80)
else:
print(
"Sending : %s, from %s to %s, dests : %s"
% (subjectvalue, fromvalue, dests[0], repr(dests))
)
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if not args.dry_run:
# sending the mail to its recipients using the local mailer via SMTP
server = smtplib.SMTP("localhost", "25")
server.set_debuglevel(1)
server.send_message(msg)
server.quit()
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if __name__ == "__main__":
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args = parse_args()
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# read the recipients file
datas = read_recipients_datas(args)
print(datas)
exit(0)
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# read the template of the mail
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bodytemplate = read_body(args)
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# optionnaly read the attachment of the mail
attachment = None
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if args.attachement:
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attachments = read_join(args)
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# counter to be able to pause each 10 mails send
counter = 0
# send mail to each recipient
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for set in sets:
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values = set
# the recipient is always in first column
recipient = values[0]
# replace substitution variables in the template for each recipient
body = replace_values(bodytemplate, values)
# send message
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send_message(body, recipient, attachments, args)
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# pause every 10 mails for 5 secs so that the MTA doesn't explode
counter = counter + 1
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if counter >= 10:
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counter = 0
print("suspending execution for 5 secs")
time.sleep(5)