114 lines
4.1 KiB
Python
114 lines
4.1 KiB
Python
#!/usr/bin/env python3
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""" E-Mail / IMAP handling """
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import os
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import logging
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import re
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import email
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import email.parser
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import socket
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import imaplib
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_EMAIL_SUBJECTS = '(OR OR SUBJECT "Einsatzausdruck_FW" SUBJECT "Einsatzprotokoll" SUBJECT "Einsatzrapport" UNSEEN)'
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class EmailHandling:
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""" Email handling """
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def __init__(self, server, username, password, mailbox, tmp_dir):
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self.logger = logging.getLogger(__name__)
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self.logger.info('Connecting to IMAP server %s', server)
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self.tmp_dir = tmp_dir
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socket.setdefaulttimeout(60)
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try:
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# TODO timeout
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self.imap = imaplib.IMAP4_SSL(server)
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self.imap.login(username, password)
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self.imap.select(mailbox, readonly=False)
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except Exception as err:
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self.logger.error('IMAP connection failed - exiting: %s', str(err))
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raise SystemExit(1)
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self.logger.info('IMAP connection successfull')
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def search_emails(self):
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""" searches for emails matching the configured subject """
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self.logger.info('Searching for messages matching: %s', _EMAIL_SUBJECTS)
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try:
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typ, msg_ids = self.imap.search(
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None,
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_EMAIL_SUBJECTS,
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)
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if typ != 'OK':
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self.logger.error('Error searching for matching messages')
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return False
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except imaplib.IMAP4.abort as err:
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self.logger.error('IMAP search aborted - exiting: %s', str(err))
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raise SystemExit(1)
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num_messages = len(msg_ids[0].split())
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self.logger.info('Found %s matching messages', str(num_messages))
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return num_messages, msg_ids
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def store_attachments(self, msg_ids):
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""" stores the attachments to filesystem and marks message as read """
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data = {}
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for msg_id in msg_ids[0].split():
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# download message from imap
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typ, msg_data = self.imap.fetch(msg_id, '(RFC822)')
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if typ != 'OK':
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self.logger.error('Error fetching message')
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continue
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# extract attachment
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for response_part in msg_data:
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if isinstance(response_part, tuple):
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mail = email.message_from_string(str(response_part[1], 'utf-8'))
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subject = mail['subject']
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f_type, f_id = self.parse_subject(subject)
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self.logger.info('[%s] Getting attachment from "%s"', f_id, subject)
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for part in mail.walk():
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file_name = part.get_filename()
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if not file_name:
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self.logger.debug(
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'Most probably not an attachment as no filename found'
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)
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continue
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self.logger.info('[%s] Extracting attachment "%s"', f_id, file_name)
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if bool(file_name):
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f_type, _ = self.parse_subject(subject)
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renamed_file_name = f_type + '_' + file_name
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# save attachment to filesystem
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file_path = os.path.join(self.tmp_dir, renamed_file_name)
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self.logger.info('[%s] Saving attachment to "%s"', f_id, file_path)
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if not os.path.isfile(file_path):
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file = open(file_path, 'wb')
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file.write(part.get_payload(decode=True))
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file.close()
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data[subject] = renamed_file_name
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# mark as seen
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self.logger.info('[%s] Marking message "%s" as seen', f_id, subject)
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self.imap.store(msg_id, '+FLAGS', '(\\Seen)')
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return data
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def parse_subject(self, subject):
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""" extract f id and type from subject """
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# This regex matches the subjects filtered already in IMAP search
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parsed = re.search('([a-zA-Z_]*):? ?(F[0-9].*)?', subject)
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f_type = parsed.group(1)
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f_id = parsed.group(2)
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return f_type, f_id
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