"""
procmail-to-dispatch.py --- use dr.botzo's Dispatch to send mail notifications

"""

import argparse
import getpass
import glob
import logging
import os
import re
import sys
import time

import requests

# set up some basic logging
logger = logging.getLogger()
handler = logging.StreamHandler(sys.stdout)
logger.addHandler(handler)
logger.setLevel(logging.DEBUG)

# set up config flags
parser = argparse.ArgumentParser()
parser.add_argument('-f', '--filename')
parser.add_argument('-l', '--location')
parser.add_argument('-u', '--user')
args = parser.parse_args()

if (args.filename == None or args.user == None or
    args.location == None):
    print("script needs -f/--filename (location of .procmailrc.log) "
          "-l/--location (url to connect to) -u/--user (user to authenticate to XML-RPC as)")
    sys.exit(2)

password = getpass.getpass("password for {0:s}: ".format(args.user))

auth = requests.auth.HTTPBasicAuth(args.user, password)

file = open(args.filename, 'r')

folderre = re.compile("^  Folder: (\S+)\s+\d+$")
senderre = re.compile("^From: (.*)$")
subjectre = re.compile("^Subject: (.*)$")

# start file at the end
st_results = os.stat(args.filename)
st_size = st_results[6]
file.seek(st_size)

def get_mail_items(filename):
    sender = None
    subject = None

    for num, line in enumerate(open(filename)):
        if senderre.search(line):
            match = senderre.search(line)
            sender = match.group(1)
        if subjectre.search(line):
            match = subjectre.search(line)
            subject = match.group(1)

        if sender and subject:
            return (sender, subject)

    if sender:
        return (sender, "[no subject]")

while 1:
    try:
        filename = None

        where = file.tell()
        line = file.readline()
        if not line:
            time.sleep(1)
            file.seek(where)
        else:
            if folderre.search(line):
                sender = None
                subject = None

                match = folderre.search(line)
                filename = match.group(1)

                # ignore /dev/null, of course
                if filename == "/dev/null":
                    logger.debug("skipping message forwarded to /dev/null")
                    continue

                # ignore Spam
                if filename.find(".Spam") > 0:
                    logger.debug("skipping spam '{0:s}'".format(filename))
                    continue

                # try opening the actual path. this is a bit racey
                logger.debug("trying to open '{0:s}'".format(filename))
                if os.path.isfile(filename):
                    logger.debug("opening '{0:s}'".format(filename))
                    (sender, subject) = get_mail_items(filename)
                else:
                    # ok... maybe something already moved it into cur. in addition
                    # they probably added flags at the end
                    filepattern = filename.replace("/new", "/cur") + "*"
                    for globhit in glob.glob(filepattern):
                        logger.debug("trying to open '{0:s}'".format(globhit))
                        if os.path.isfile(globhit):
                            logger.debug("opening '{0:s}'".format(globhit))
                            (sender, subject) = get_mail_items(globhit)

                if sender and subject:
                    logger.debug("notifying: '{0:s}' from {1:s}".format(subject, sender))
                    message = "'{0:s}' from {1:s}".format(subject, sender)
                    payload = {'message': message}
                    r = requests.post(args.location, verify=False, auth=auth, data=payload)
                    print(r.json())
    except UnicodeDecodeError as e:
        logger.error("Error: " + str(e) + ", skipping")
        pass

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