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#
# Copyright (c) 2015 ThoughtWorks, Inc.
#
# Pixelated is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Pixelated 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with Pixelated. If not, see <http://www.gnu.org/licenses/>.
from email.mime.text import MIMEText
from email.utils import formatdate
from random import Random
from pixelated.support.markov import MarkovGenerator
import re
from collections import Counter
import time
def filter_two_line_on_wrote(lines):
skip_next = False
if len(lines) > 0:
for i in xrange(len(lines) - 1):
if skip_next:
skip_next = False
continue
if lines[i].startswith('On') and lines[i + 1].endswith('wrote:'):
skip_next = True
else:
yield lines[i].strip()
yield lines[-1]
def filter_lines(text):
pattern = re.compile('\s*[>-].*')
wrote_pattern = re.compile('\s*On.*wrote.*')
lines = text.splitlines()
lines = filter(lambda line: not pattern.match(line), lines)
lines = filter(lambda line: not len(line.strip()) == 0, lines)
lines = filter(lambda line: not wrote_pattern.match(line), lines)
lines = filter(lambda line: not line.endswith('writes:'), lines)
lines = filter(lambda line: ' ' in line.strip(), lines)
lines = filter_two_line_on_wrote(lines)
return ' '.join(lines)
def decode_multipart_mail_text(mail):
for payload in mail.get_payload():
if payload.get_content_type() == 'text/plain':
return payload.get_payload(decode=True)
return ''
def search_for_tags(content):
words = content.split()
only_alnum = filter(lambda word: word.isalnum(), words)
only_longer = filter(lambda word: len(word) > 5, only_alnum)
lower_case = map(lambda word: word.lower(), only_longer)
counter = Counter(lower_case)
potential_tags = counter.most_common(10)
return map(lambda tag: tag[0], potential_tags)
def filter_too_short_texts(texts):
return [text for text in texts if text is not None and len(text.split()) >= 3]
def load_all_mails(mail_list):
subjects = set()
mail_bodies = []
for mail in mail_list:
subjects.add(mail['Subject'])
if mail.is_multipart():
mail_bodies.append(filter_lines(decode_multipart_mail_text(mail)))
else:
if mail.get_content_type() == 'text/plain':
mail_bodies.append(filter_lines(mail.get_payload(decode=True)))
else:
raise Exception(mail.get_content_type())
return filter_too_short_texts(subjects), filter_too_short_texts(mail_bodies)
class MailGenerator(object):
NAMES = ['alice', 'bob', 'eve']
def __init__(self, receiver, domain_name, sample_mail_list, random=None):
self._random = random if random else Random()
self._receiver = receiver
self._domain_name = domain_name
self._subjects, self._bodies = load_all_mails(sample_mail_list)
self._potential_tags = search_for_tags(' '.join(self._bodies))
self._subject_markov = MarkovGenerator(
self._subjects, random=self._random)
self._body_markov = MarkovGenerator(
self._bodies, random=self._random, add_paragraph_on_empty_chain=True)
def generate_mail(self):
body = self._body_markov.generate(150)
mail = MIMEText(body)
mail['Subject'] = self._subject_markov.generate(8)
mail['To'] = '%s@%s' % (self._receiver, self._domain_name)
mail['From'] = self._random_from()
mail['Date'] = self._random_date()
mail['X-Tags'] = self._random_tags()
mail['X-Leap-Encryption'] = self._random_encryption_state()
mail['X-Leap-Signature'] = self._random_signature_state()
return mail
def _random_date(self):
now = int(time.time())
ten_days = 60 * 60 * 24 * 10
mail_time = self._random.randint(now - ten_days, now)
return formatdate(mail_time)
def _random_encryption_state(self):
return self._random.choice(['true', 'decrypted'])
def _random_signature_state(self):
return self._random.choice(['could not verify', 'valid'])
def _random_from(self):
name = self._random.choice(
filter(lambda name: name != self._receiver, MailGenerator.NAMES))
return '%s@%s' % (name, self._domain_name)
def _random_tags(self):
barrier = 0.5
tags = set()
while self._random.random() > barrier:
tags.add(self._random.choice(self._potential_tags))
barrier += 0.15
return ' '.join(tags)
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