212 lines
7.8 KiB
Python
212 lines
7.8 KiB
Python
import smtplib
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import os
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import json
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import logging
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import sys
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from email.parser import BytesParser
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from email.policy import default
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from datetime import datetime
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import redis
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import smtpd
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import asyncore
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import base64
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from .config import Config
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# 配置日志输出到控制台
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logging.basicConfig(
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level=logging.DEBUG, # 改为 DEBUG 级别
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format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
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handlers=[
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logging.StreamHandler(sys.stdout)
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]
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)
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logger = logging.getLogger('smtp_server')
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# 初始化 Redis 客户端
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redis_client = redis.from_url(Config.REDIS_URL)
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class CustomSMTPServer(smtpd.SMTPServer):
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def __init__(self, localaddr, remoteaddr):
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logger.info(f"Initializing SMTP server on {localaddr}")
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super().__init__(localaddr, remoteaddr)
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def process_message(self, peer, mailfrom, rcpttos, data):
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try:
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logger.debug(f"Connection from peer: {peer}")
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logger.debug(f"Mail from: {mailfrom}")
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logger.debug(f"Recipients: {rcpttos}")
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logger.debug(f"Raw data length: {len(data)} bytes")
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# 记录接收到的邮件基本信息
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logger.info(f"Received mail from {mailfrom} to {rcpttos}")
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# 验证收件人域名
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valid_recipients = []
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for rcpt in rcpttos:
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if not rcpt.endswith('@nosqli.com'):
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logger.warning(f"Rejected mail to {rcpt}: invalid domain")
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else:
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valid_recipients.append(rcpt)
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if not valid_recipients:
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logger.error("No valid recipients found")
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return
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# 解析邮件
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logger.debug("Parsing email data...")
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email = BytesParser(policy=default).parsebytes(data)
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# 获取邮件正文
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body = self._get_email_body(email)
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logger.debug(f"Email body length: {len(body) if body else 0}")
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# 处理附件
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attachments = self._process_attachments(email)
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logger.debug(f"Found {len(attachments)} attachments")
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# 构建邮件数据
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timestamp = datetime.now().isoformat()
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message_id = email.get('Message-ID', f"<{timestamp}@nosqli.com>")
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email_data = {
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'message_id': message_id,
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'subject': email.get('subject', ''),
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'sender': mailfrom,
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'recipients': json.dumps(valid_recipients),
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'body': body,
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'timestamp': timestamp,
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'attachments': json.dumps(attachments),
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'headers': json.dumps(dict(email.items())),
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'peer': json.dumps(peer)
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}
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# 存储邮件
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self._store_email(email_data)
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logger.info(f"Successfully processed mail: {message_id}")
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except Exception as e:
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logger.error(f"Error processing email: {str(e)}", exc_info=True)
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raise
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def _get_email_body(self, email):
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"""提取邮件正文"""
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try:
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logger.debug("Extracting email body...")
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if email.is_multipart():
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for part in email.walk():
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if part.get_content_type() == "text/plain":
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content = part.get_payload(decode=True).decode()
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logger.debug(f"Found text/plain content: {len(content)} chars")
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return content
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else:
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content = email.get_payload(decode=True).decode()
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logger.debug(f"Found single part content: {len(content)} chars")
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return content
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logger.warning("No text content found in email")
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return ""
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except Exception as e:
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logger.error(f"Error extracting email body: {str(e)}")
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return ""
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def _process_attachments(self, email):
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"""处理邮件附件"""
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attachments = []
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try:
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logger.debug("Processing attachments...")
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if email.is_multipart():
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for part in email.walk():
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if part.get_content_maintype() == 'multipart':
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continue
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if part.get('Content-Disposition') is None:
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continue
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filename = part.get_filename()
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if filename:
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logger.debug(f"Processing attachment: {filename}")
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attachment_data = part.get_payload(decode=True)
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attachments.append({
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'filename': filename,
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'content': base64.b64encode(attachment_data).decode(),
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'content_type': part.get_content_type(),
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'size': len(attachment_data)
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})
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logger.debug(f"Attachment processed: {filename} ({len(attachment_data)} bytes)")
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except Exception as e:
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logger.error(f"Error processing attachments: {str(e)}")
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return attachments
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def _store_email(self, email_data):
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"""存储邮件到 Redis"""
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try:
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logger.debug("Storing email in Redis...")
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# 使用 message_id 作为主键
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email_key = f"email:{email_data['message_id']}"
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redis_client.hmset(email_key, email_data)
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logger.debug(f"Stored email with key: {email_key}")
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# 为每个收件人创建索引
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recipients = json.loads(email_data['recipients'])
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for recipient in recipients:
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recipient_key = f"recipient:{recipient}"
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redis_client.lpush(recipient_key, email_key)
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logger.debug(f"Created recipient index: {recipient_key}")
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# 创建时间索引
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time_key = f"time:{email_data['timestamp']}"
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redis_client.set(time_key, email_key)
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logger.debug(f"Created time index: {time_key}")
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# 设置过期时间（可选，这里设置为30天）
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redis_client.expire(email_key, 30 * 24 * 60 * 60)
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logger.debug("Set expiration time: 30 days")
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except Exception as e:
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logger.error(f"Error storing email: {str(e)}")
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raise
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def start_smtp_server(host='0.0.0.0', port=25):
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"""启动 SMTP 服务器"""
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try:
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logger.info(f"Starting SMTP server on {host}:{port}")
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server = CustomSMTPServer((host, port), None)
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logger.info("SMTP server initialized, entering main loop...")
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asyncore.loop()
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except Exception as e:
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logger.error(f"Error starting SMTP server: {str(e)}")
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raise
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def get_emails_by_recipient(recipient, limit=10):
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"""获取指定收件人的最新邮件"""
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try:
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recipient_key = f'recipient:{recipient}'
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email_keys = redis_client.lrange(recipient_key, 0, limit - 1)
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emails = []
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for key in email_keys:
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email_data = redis_client.hgetall(key.decode())
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if email_data:
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# 转换数据为字符串
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email_data = {k.decode(): v.decode() for k, v in email_data.items()}
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emails.append(email_data)
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return emails
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except Exception as e:
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print(f'Error fetching emails: {e}')
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return []
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def get_attachment(email_key, attachment_index):
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"""获取指定邮件的附件"""
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try:
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email_data = redis_client.hgetall(email_key)
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if email_data:
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attachments = json.loads(email_data[b'attachments'].decode())
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if 0 <= attachment_index < len(attachments):
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return attachments[attachment_index]
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return None
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except Exception as e:
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print(f'Error fetching attachment: {e}')
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return None |