mail2cert.py

#!/usr/bin/env python
"""
mail2cert.py: 
Extracts certificates from Outlook emails.
Uses only emails received today and with specific subject.
Certificate is saved to a file, where file name is the first FQDN found
in the email.

Can be easily modified to extract anything using given regex.
"""

from win32com.client import constants
from win32com.client.gencache import EnsureDispatch as Dispatch
import datetime as dt
import re

outlook = Dispatch("Outlook.Application")
mapi = outlook.GetNamespace("MAPI")

ACCOUNT = "[email protected]"
INBOX_FOLDER = "Inbox"
SUBJECT = "Certificate approved. Installation next steps."
CERT_EXTENSION = ".p7b"
FQDN_REGEX = "(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.){2,}([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9]){2,}"
CERT_REGEX = "-+BEGIN CERTIFICATE-+\s+(.*?)\s+-+END CERTIFICATE-+"


class Oli():
    def __init__(self, outlook_object):
        self._obj = outlook_object

    def items(self):
        array_size = self._obj.Count
        for item_index in range(1, array_size+1):
            yield (item_index, self._obj[item_index])

    def prop(self):
        return sorted(self._obj._prop_map_get_.keys())


def main():
    for inx, folder in Oli(mapi.Folders).items():
        if (folder.Name == ACCOUNT):
            for inx, subfolder in Oli(folder.Folders).items():
                #print("(%i)" % inx, subfolder.Name,"=> ", subfolder)
                if subfolder.Name == INBOX_FOLDER:
                    messages = subfolder.Items
                    lastDayDateTime = dt.datetime.now() - dt.timedelta(days=1)
                    todaysMessages = messages.Restrict(
                        "[ReceivedTime] >= '" + lastDayDateTime.strftime('%m/%d/%Y %H:%M %p')+"'")
                    certMessages = todaysMessages.Restrict(
                        "[Subject] = '%s'" % SUBJECT)
                    print("Number of messages: %s" % len(certMessages))
                    for message in certMessages:
                        subject = message.Subject
                        # print(subject)
                        body_content = message.Body
                        m = re.search(FQDN_REGEX, body_content)
                        fqdn = m.group(0)
                        print(fqdn)
                        m = re.search(CERT_REGEX, body_content, flags=re.DOTALL)
                        cert = m.group(0)
                        print(cert)
                        f = open(fqdn+CERT_EXTENSION, "w")
                        f.write(cert)
                        f.close()


if __name__ == "__main__":
    main()