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mailparsing.py
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mailparsing.py
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#
# Copyright 2019 Christelle Zouein <christellezouein@hotmail.com>
#
# The authors license this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import os
import pandas
import argparse
import mailbox
from datetime import datetime
from pytz import utc
from email.utils import parseaddr
from email import policy, message_from_binary_file
from rulesetfinding import find_rulesets
MAIL_FIELDS = ["sender_name", "sender_email", "date", "subject", "in_reply_to", "references", "message_id", "body"]
class _MailParser:
def __init__(self):
self.__paths = []
self.__rulesets = {}
@staticmethod
def get_argument_parser() -> argparse.ArgumentParser:
arg_parser = argparse.ArgumentParser(add_help=False)
arg_parser.add_argument(
"paths",
metavar="path",
nargs="+",
help="Path of a mail archive to process or of a directory containing mail archives",
)
arg_parser.add_argument("-f", "--start", help="Start date")
arg_parser.add_argument("-u", "--end", help="End date")
return arg_parser
def add_archive(self, path):
if not isinstance(path, str):
raise ValueError("String expected")
abs_path = os.path.abspath(os.path.expanduser(path))
self.__rulesets[abs_path] = find_rulesets(abs_path, "comdaan_mail.py")
self.__paths.append(abs_path)
def add_archives(self, paths):
if isinstance(paths, str):
self.__add_archives([paths])
else:
self.__add_archives(paths)
def __add_archives(self, paths):
for path in paths:
abs_path = os.path.abspath(os.path.expanduser(path))
if os.path.isdir(abs_path):
subpaths = list(map(lambda x: os.path.join(abs_path, x), os.listdir(abs_path)))
for subpath in subpaths:
self.add_archives(subpath)
else:
if not path.endswith(".mbox"):
continue
self.add_archive(path)
def get_emails(self, start_date=None, end_date=None):
entries = []
for path in self.__paths:
entries.extend(self.__create_entries(path, start_date, end_date))
return pandas.DataFrame(entries, columns=MAIL_FIELDS)
def __create_entries(self, path, start_date=None, end_date=None):
emails = []
def get_body(message):
if message.is_multipart():
return get_body(next(message.iter_parts()))
else:
return message.get_content()
for msg in mailbox.mbox(path, factory=lambda f: message_from_binary_file(f, policy=policy.default)):
sender = parseaddr(msg["From"])
try:
body = get_body(msg)
except:
body = "Unknown encoding. Failed to retrieve message body."
email_message = {
"sender_name": sender[0],
"sender_email": sender[-1],
"subject": msg["Subject"],
"date": msg["Date"],
"message_id": msg["Message-ID"],
"references": msg["References"],
"in_reply_to": msg["In-Reply-To"],
"body": body,
}
emails.append(email_message)
start_datetime = None
if start_date:
start_datetime = datetime.strptime(start_date, "%Y-%m-%d")
end_datetime = None
if end_date:
end_datetime = datetime.strptime(end_date, "%Y-%m-%d")
rulesets = self.__rulesets.get(path, [])
emails = list(filter(lambda x: self.__is_entry_acceptable(x, start_datetime, end_datetime, rulesets), emails))
emails = list(map(lambda x: self.__postprocess_entry(x, rulesets), emails))
return emails
def __is_entry_acceptable(self, entry, start_datetime, end_datetime, rulesets):
for ruleset in rulesets:
if not ruleset.is_entry_acceptable(entry):
return False
try:
entry_datetime = datetime.strptime(entry["date"], "%a, %d %b %Y %H:%M:%S %z").astimezone(utc)
if start_datetime and entry_datetime.date() < start_datetime.date():
return False
if end_datetime and entry_datetime.date() > end_datetime.date():
return False
if entry_datetime.date() > datetime.now().date():
return False
except:
return False
return True
def __postprocess_entry(self, entry, rulesets):
if entry["references"]:
entry["references"] = set(entry["references"].split(" "))
else:
entry["references"] = set()
entry["date"] = datetime.strptime(entry["date"], "%a, %d %b %Y %H:%M:%S %z").astimezone(utc)
for ruleset in rulesets:
ruleset.postprocess_entry(entry)
return entry