# pylint: disable=C0301, C0114 import json import imaplib import smtplib import email from email.mime.multipart import MIMEMultipart from email.mime.text import MIMEText from email.utils import parseaddr from email.header import decode_header import time import datetime import logging import socket import re import socks def provider_in(address, provider_list): """Check if the provider is in the provider list""" for provider in provider_list: if address.endswith(provider): return True return False def decode_mime_words(s): """Decodes a string containing multiple MIME words""" decoded_fragments = decode_header(s) return ''.join( str(fragment, encoding or 'utf-8') if isinstance(fragment, bytes) else fragment for fragment, encoding in decoded_fragments ) def add_mask(original_msg, content, is_html): """Adds a mask to the content""" original_subject = decode_mime_words(original_msg['Subject']) from_name, from_address = parseaddr(original_msg['From']) from_name = decode_mime_words(from_name) to_name, to_address = parseaddr(original_msg['To']) to_name = decode_mime_words(to_name) header = f"""

Forwarded Email

{'' if is_html else '

This email is plain text, it may have display issues

'}

From: {from_name} <{from_address}>

To: {to_name} <{to_address}>

Subject: {original_subject}

""" footer = """
FORWARDED

Notice:

 This is a automatically forwarded email, which means it may contains something bad.

 You shouldn't reply directly to this email, it will never reach your destination!

""" return header + content + footer def load_config(config_file='config.json'): """Loads the configuration file""" with open(config_file, 'r', encoding='utf-8') as file: config = json.load(file) return config def set_proxy(proxy_config): """Sets the proxy""" socks.setdefaultproxy(socks.PROXY_TYPE_SOCKS5, proxy_config['server'], proxy_config['port']) socket.socket = socks.socksocket def setup_logging(filename): """Sets up the logging""" logger = logging.getLogger() logger.setLevel('DEBUG') basic_format = "%(asctime)s >> %(levelname)s - %(message)s" date_format = '%Y-%m-%d %H:%M:%S' formatter = logging.Formatter(basic_format, date_format) chlr = logging.StreamHandler() chlr.setFormatter(formatter) chlr.setLevel('INFO') fhlr = logging.FileHandler(filename, encoding='utf-8') fhlr.setFormatter(formatter) logger.addHandler(chlr) logger.addHandler(fhlr) return logger def get_unforwarded_emails(account_config, logger): """Gets the unforwarded emails""" if account_config['proxy']['enabled']: set_proxy(account_config['proxy']) if account_config['imap'].get('use_ssl', True): imap = imaplib.IMAP4_SSL(account_config['imap']['server'], account_config['imap']['port'], timeout=10) else: imap = imaplib.IMAP4(account_config['imap']['server'], account_config['imap']['port'], timeout=10) imap.login(account_config['email'], account_config['password']) if provider_in(account_config['email'], ["163.com", "126.com"]): imaplib.Commands['ID'] = 'AUTH' args = ("name","XXXX","contact","XXXX@163.com","version","1.0.0","vendor","myclient") imap._simple_command('ID', '("' + '" "'.join(args) + '")') # pylint: disable=W0212 imap.select() _, messages = imap.search(None, 'UNSEEN') email_ids = messages[0].split() emails = [] for email_id in email_ids: _, data = imap.fetch(email_id, '(RFC822)') for response_part in data: if isinstance(response_part, tuple): msg = email.message_from_bytes(response_part[1]) # pylint: disable=E1136 emails.append((email_id, msg)) imap.store(email_id, '+FLAGS', '\\Seen') imap.logout() if len(emails) > 0: logger.info(f"Retrieved {len(emails)} new emails from {account_config['email']}") return emails def forward_emails(account_config, emails, logger): """Forwards the emails""" if account_config['proxy']['enabled']: set_proxy(account_config['proxy']) smtp = None if account_config['smtp'].get('use_ssl', False): smtp = smtplib.SMTP_SSL(account_config['smtp']['server'], account_config['smtp']['port'], timeout=10) else: smtp = smtplib.SMTP(account_config['smtp']['server'], account_config['smtp']['port'], timeout=10) if account_config['smtp'].get('use_starttls', False): smtp.starttls() smtp.login(account_config['email'], account_config['password']) for email_id, original_msg in emails: for recipient in account_config['forward']['to']: from_name, from_address = parseaddr(original_msg['From']) from_name = decode_mime_words(from_name) to_name, to_address = parseaddr(original_msg['To']) to_name = decode_mime_words(to_name) msg = MIMEMultipart('mixed') msg['From'] = f'"{from_name} ({from_address}) via Forwarder" <{account_config["email"]}>' msg['To'] = f'"{to_name} ({to_address}) via Forwarder" <{recipient}>' original_subject = decode_mime_words(original_msg['Subject']) msg['Subject'] = original_subject body = "" attachments = [] if original_msg.is_multipart(): for part in original_msg.walk(): content_type = part.get_content_type() content_disposition = str(part.get("Content-Disposition")) if "attachment" in content_disposition or part.get_filename(): attachments.append(part) elif content_type == 'text/html': body = part.get_payload(decode=True).decode() elif content_type == 'text/plain' and not body: body = part.get_payload(decode=True).decode() else: body = original_msg.get_payload(decode=True).decode() if not body: logger.error(f"Failed to extract body from email {email_id}") continue is_html = bool(re.compile(r'<[^>]+>').search(body)) if not is_html: body = body.replace('\n', '
') html_content = add_mask(original_msg, body, is_html) msg.attach(MIMEText(html_content, 'html')) for attachment in attachments: filename = attachment.get_filename() if decode_header(filename): filename = decode_mime_words(filename) attachment.add_header('Content-Disposition', 'attachment', filename=filename) msg.attach(attachment) smtp.sendmail(account_config['email'], recipient, msg.as_string()) logger.info(f"Forwarded email {original_subject} from {account_config['email']} to {recipient}") smtp.quit() def main(): """Main function""" config = load_config() logger = setup_logging(config['log']) while True: for account in config['accounts']: if account['enabled']: try: emails = get_unforwarded_emails(account, logger) if emails: forward_emails(account, emails, logger) except Exception as e: # pylint: disable=W0718 logger.error(f"Error processing account {account['email']}: {str(e)}") # pylint: disable=W1203 logger.info(datetime.datetime.now().strftime("Check finished at %Y-%m-%d %H:%M:%S")) time.sleep(config.get('check_interval', 60)) if __name__ == "__main__": main()