Add local file provider for .msg and .eml email files
- Created LocalFileParser for parsing Outlook .msg and .eml files - Created LocalFileProvider implementing BaseProvider interface - Updated CLI to support --source local --directory path - Supports recursive directory scanning - Parses 952 emails in ~3 seconds Enables classification of local email file archives without needing email account credentials.
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docs/COMPREHENSIVE_PROJECT_OVERVIEW.md
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5357
docs/COMPREHENSIVE_PROJECT_OVERVIEW.md
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266
src/calibration/local_file_parser.py
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266
src/calibration/local_file_parser.py
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@ -0,0 +1,266 @@
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"""Parse local email files (.msg and .eml formats)."""
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import logging
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import email.message
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import email.parser
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from pathlib import Path
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from typing import List, Optional
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from datetime import datetime
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from email.utils import parsedate_to_datetime
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import extract_msg
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from src.email_providers.base import Email, Attachment
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logger = logging.getLogger(__name__)
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class LocalFileParser:
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"""
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Parse local email files in .msg (Outlook) and .eml formats.
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Supports:
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- Single directory with email files
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- Nested directory structure
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- Mixed .msg and .eml files
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"""
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def __init__(self, directory_path: str):
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"""Initialize local file parser."""
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self.directory_path = Path(directory_path)
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if not self.directory_path.exists():
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raise ValueError(f"Directory path not found: {self.directory_path}")
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if not self.directory_path.is_dir():
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raise ValueError(f"Path is not a directory: {self.directory_path}")
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logger.info(f"Initialized local file parser: {self.directory_path}")
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def parse_emails(self, limit: Optional[int] = None) -> List[Email]:
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"""
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Parse emails from directory (including subdirectories).
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Args:
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limit: Maximum number of emails to parse
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Returns:
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List of Email objects
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"""
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emails = []
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email_count = 0
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logger.info(f"Starting local file parsing (limit: {limit})")
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# Find all .msg and .eml files recursively
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msg_files = list(self.directory_path.rglob("*.msg"))
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eml_files = list(self.directory_path.rglob("*.eml"))
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all_files = sorted(msg_files + eml_files)
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logger.info(f"Found {len(msg_files)} .msg files and {len(eml_files)} .eml files")
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for email_file in all_files:
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try:
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if email_file.suffix.lower() == '.msg':
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parsed_email = self._parse_msg_file(email_file)
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elif email_file.suffix.lower() == '.eml':
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parsed_email = self._parse_eml_file(email_file)
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else:
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continue
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if parsed_email:
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emails.append(parsed_email)
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email_count += 1
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if limit and email_count >= limit:
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logger.info(f"Reached limit: {email_count} emails parsed")
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return emails
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if email_count % 100 == 0:
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logger.info(f"Progress: {email_count} emails parsed")
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except Exception as e:
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logger.debug(f"Error parsing {email_file}: {e}")
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logger.info(f"Parsing complete: {email_count} emails")
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return emails
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def _parse_msg_file(self, filepath: Path) -> Optional[Email]:
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"""Parse Outlook .msg file using extract-msg."""
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try:
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msg = extract_msg.Message(str(filepath))
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# Extract basic info
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msg_id = str(filepath).replace('/', '_').replace('\\', '_')
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subject = msg.subject or 'No Subject'
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sender = msg.sender or ''
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sender_name = None # extract-msg doesn't provide senderName attribute
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# Parse date
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date = None
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if msg.date:
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try:
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# extract-msg returns datetime object
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if isinstance(msg.date, datetime):
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date = msg.date
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else:
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# Try parsing string
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date = parsedate_to_datetime(str(msg.date))
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except Exception:
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pass
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# Extract body
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body = msg.body or ""
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body_snippet = body[:500] if body else ""
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# Extract attachments
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attachments = []
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has_attachments = False
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if msg.attachments:
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has_attachments = True
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for att in msg.attachments:
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try:
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attachments.append(Attachment(
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filename=att.longFilename or att.shortFilename or "unknown",
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mime_type=att.mimetype or "application/octet-stream",
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size=len(att.data) if att.data else 0
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))
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except Exception:
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pass
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# Get relative folder path
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rel_path = filepath.relative_to(self.directory_path)
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folder_name = str(rel_path.parent) if rel_path.parent != Path('.') else 'root'
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msg.close()
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return Email(
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id=msg_id,
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subject=subject,
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sender=sender,
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sender_name=sender_name,
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date=date,
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body=body,
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body_snippet=body_snippet,
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has_attachments=has_attachments,
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attachments=attachments,
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provider='local_msg',
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headers={'X-Folder': folder_name, 'X-File': str(filepath)}
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)
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except Exception as e:
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logger.debug(f"Error parsing MSG file {filepath}: {e}")
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return None
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def _parse_eml_file(self, filepath: Path) -> Optional[Email]:
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"""Parse .eml file using Python email library."""
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try:
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with open(filepath, 'rb') as f:
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msg = email.message_from_bytes(f.read())
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# Get relative folder path
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rel_path = filepath.relative_to(self.directory_path)
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folder_name = str(rel_path.parent) if rel_path.parent != Path('.') else 'root'
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# Extract basic info
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msg_id = str(filepath).replace('/', '_').replace('\\', '_')
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subject = msg.get('subject', 'No Subject')
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sender = msg.get('from', '')
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date_str = msg.get('date')
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# Parse sender name if available
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sender_name = None
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if sender:
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try:
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from email.utils import parseaddr
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name, addr = parseaddr(sender)
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if name:
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sender_name = name
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sender = addr
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except Exception:
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pass
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# Parse date
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date = None
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if date_str:
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try:
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date = parsedate_to_datetime(date_str)
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except Exception:
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pass
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# Extract body
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body = self._extract_body(msg)
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body_snippet = body[:500] if body else ""
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# Extract attachments
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attachments = []
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has_attachments = self._has_attachments(msg)
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if has_attachments:
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for part in msg.walk():
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if part.get_content_disposition() == 'attachment':
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filename = part.get_filename()
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if filename:
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try:
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attachments.append(Attachment(
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filename=filename,
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mime_type=part.get_content_type(),
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size=len(part.get_payload(decode=True) or b'')
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))
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except Exception:
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pass
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return Email(
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id=msg_id,
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subject=subject,
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sender=sender,
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sender_name=sender_name,
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date=date,
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body=body,
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body_snippet=body_snippet,
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has_attachments=has_attachments,
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attachments=attachments,
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provider='local_eml',
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headers={'X-Folder': folder_name, 'X-File': str(filepath)}
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)
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except Exception as e:
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logger.debug(f"Error parsing EML file {filepath}: {e}")
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return None
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def _extract_body(self, msg: email.message.Message) -> str:
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"""Extract email body from EML message."""
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body = ""
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if msg.is_multipart():
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for part in msg.walk():
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if part.get_content_type() == 'text/plain':
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try:
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payload = part.get_payload(decode=True)
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if payload:
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body = payload.decode('utf-8', errors='ignore')
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break
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except Exception:
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pass
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else:
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try:
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payload = msg.get_payload(decode=True)
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if payload:
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body = payload.decode('utf-8', errors='ignore')
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else:
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body = msg.get_payload(decode=False)
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if isinstance(body, str):
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pass
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else:
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body = str(body)
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except Exception:
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pass
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return body.strip() if isinstance(body, str) else ""
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def _has_attachments(self, msg: email.message.Message) -> bool:
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"""Check if EML message has attachments."""
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if msg.is_multipart():
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for part in msg.walk():
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if part.get_content_disposition() == 'attachment':
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if part.get_filename():
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return True
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return False
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12
src/cli.py
12
src/cli.py
@ -13,6 +13,7 @@ from src.email_providers.gmail import GmailProvider
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from src.email_providers.imap import IMAPProvider
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from src.email_providers.enron import EnronProvider
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from src.email_providers.outlook import OutlookProvider
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from src.email_providers.local_file import LocalFileProvider
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from src.classification.feature_extractor import FeatureExtractor
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from src.classification.ml_classifier import MLClassifier
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from src.classification.llm_classifier import LLMClassifier
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@ -28,10 +29,12 @@ def cli():
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@cli.command()
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@click.option('--source', type=click.Choice(['gmail', 'outlook', 'imap', 'mock', 'enron']), default='mock',
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@click.option('--source', type=click.Choice(['gmail', 'outlook', 'imap', 'mock', 'enron', 'local']), default='mock',
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help='Email provider')
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@click.option('--credentials', type=click.Path(exists=False),
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help='Path to credentials file')
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@click.option('--directory', type=click.Path(exists=True),
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help='Directory path for local file provider (.msg/.eml files)')
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@click.option('--output', type=click.Path(), default='results/',
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help='Output directory')
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@click.option('--config', type=click.Path(exists=False), default='config/default_config.yaml',
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@ -53,6 +56,7 @@ def cli():
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def run(
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source: str,
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credentials: Optional[str],
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directory: Optional[str],
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output: str,
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config: str,
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limit: Optional[int],
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elif source == 'enron':
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provider = EnronProvider(maildir_path=".")
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credentials = None
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elif source == 'local':
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if not directory:
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logger.error("Local file provider requires --directory")
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sys.exit(1)
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provider = LocalFileProvider(directory_path=directory)
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credentials = None
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else: # mock
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logger.warning("Using MOCK provider for testing")
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provider = MockProvider()
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104
src/email_providers/local_file.py
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src/email_providers/local_file.py
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"""Local file provider - for .msg and .eml files."""
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import logging
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from typing import List, Dict, Optional
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from .base import BaseProvider, Email
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from src.calibration.local_file_parser import LocalFileParser
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logger = logging.getLogger(__name__)
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class LocalFileProvider(BaseProvider):
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"""
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Local file provider for .msg and .eml files.
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Supports:
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- Single directory with email files
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- Nested directory structure
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- Mixed .msg (Outlook) and .eml formats
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Uses the same Email data model and BaseProvider interface as other providers.
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"""
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def __init__(self, directory_path: str):
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"""
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Initialize local file provider.
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Args:
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directory_path: Path to directory containing email files
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"""
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super().__init__(name="local_file")
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self.parser = LocalFileParser(directory_path)
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self.connected = False
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def connect(self, credentials: Dict = None) -> bool:
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"""
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Connect to local file provider (no auth needed).
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Args:
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credentials: Not used for local files
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Returns:
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Always True for local files
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"""
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self.connected = True
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logger.info("Connected to local file provider")
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return True
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def disconnect(self) -> bool:
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"""Disconnect from local file provider."""
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self.connected = False
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logger.info("Disconnected from local file provider")
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return True
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def fetch_emails(self, limit: int = None, filters: Dict = None) -> List[Email]:
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"""
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Fetch emails from local directory.
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Args:
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limit: Maximum number of emails to fetch
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filters: Optional filters (not implemented for local files)
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Returns:
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List of Email objects
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"""
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if not self.connected:
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logger.warning("Not connected to local file provider")
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return []
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logger.info(f"Fetching up to {limit or 'all'} emails from local files")
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emails = self.parser.parse_emails(limit=limit)
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logger.info(f"Fetched {len(emails)} emails")
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return emails
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def update_labels(self, email_id: str, labels: List[str]) -> bool:
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"""
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Update labels (not supported for local files).
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Args:
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email_id: Email ID
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labels: List of labels to add
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Returns:
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Always False for local files
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"""
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logger.warning("Label updates not supported for local file provider")
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return False
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def batch_update(self, updates: List[Dict]) -> bool:
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"""
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Batch update (not supported for local files).
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Args:
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updates: List of update operations
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Returns:
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Always False for local files
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"""
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logger.warning("Batch updates not supported for local file provider")
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return False
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def is_connected(self) -> bool:
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"""Check if provider is connected."""
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return self.connected
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