92 lines
3.2 KiB
Python
92 lines
3.2 KiB
Python
#!/usr/bin/env python3
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"""
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Bounce detection and header rewriting
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"""
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from typing import Tuple, Any
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from logger import log
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from aws.dynamodb_handler import DynamoDBHandler
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class BounceHandler:
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"""Handles bounce detection and header rewriting"""
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def __init__(self, dynamodb: DynamoDBHandler):
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self.dynamodb = dynamodb
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@staticmethod
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def is_ses_bounce_notification(parsed_email) -> bool:
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"""Check if email is from SES MAILER-DAEMON"""
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from_header = (parsed_email.get('From') or '').lower()
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return 'mailer-daemon@' in from_header and 'amazonses.com' in from_header
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def apply_bounce_logic(
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self,
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parsed,
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subject: str,
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worker_name: str = 'unified'
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) -> Tuple[Any, bool]:
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"""
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Check for SES Bounce, lookup in DynamoDB and rewrite headers
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Args:
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parsed: Parsed email message object
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subject: Email subject
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worker_name: Worker name for logging
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Returns:
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Tuple of (parsed_email_object, was_modified_bool)
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"""
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if not self.is_ses_bounce_notification(parsed):
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return parsed, False
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log("🔍 Detected SES MAILER-DAEMON bounce notification", 'INFO', worker_name)
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# Extract Message-ID from header
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message_id = (parsed.get('Message-ID') or '').strip('<>').split('@')[0]
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if not message_id:
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log("⚠ Could not extract Message-ID from bounce notification", 'WARNING', worker_name)
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return parsed, False
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log(f" Looking up Message-ID: {message_id}", 'INFO', worker_name)
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# Lookup in DynamoDB
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bounce_info = self.dynamodb.get_bounce_info(message_id, worker_name)
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if not bounce_info:
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return parsed, False
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# Bounce Info ausgeben
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original_source = bounce_info['original_source']
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bounced_recipients = bounce_info['bouncedRecipients']
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bounce_type = bounce_info['bounceType']
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bounce_subtype = bounce_info['bounceSubType']
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log(f"✓ Found bounce info:", 'INFO', worker_name)
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log(f" Original sender: {original_source}", 'INFO', worker_name)
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log(f" Bounce type: {bounce_type}/{bounce_subtype}", 'INFO', worker_name)
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log(f" Bounced recipients: {bounced_recipients}", 'INFO', worker_name)
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if bounced_recipients:
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new_from = bounced_recipients[0]
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# Rewrite Headers
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parsed['X-Original-SES-From'] = parsed.get('From', '')
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parsed['X-Bounce-Type'] = f"{bounce_type}/{bounce_subtype}"
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parsed.replace_header('From', new_from)
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if not parsed.get('Reply-To'):
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parsed['Reply-To'] = new_from
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# Subject anpassen
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if 'delivery status notification' in subject.lower() or 'thanks for your submission' in subject.lower():
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parsed.replace_header('Subject', f"Delivery Status: {new_from}")
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log(f"✓ Rewritten FROM: {new_from}", 'SUCCESS', worker_name)
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return parsed, True
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log("⚠ No bounced recipients found in bounce info", 'WARNING', worker_name)
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return parsed, False
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