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"""Mbox parser.
Contains simple parser for mbox files.
"""
from pathlib import Path
from typing import Any, Dict, List
from gpt_index.readers.file.base_parser import BaseParser
class MboxParser(BaseParser):
"""Mbox parser.
Extract messages from mailbox files.
Returns string including date, subject, sender, receiver and
content for each message.
"""
DEFAULT_MESSAGE_FORMAT: str = (
"Date: {_date}\n"
"From: {_from}\n"
"To: {_to}\n"
"Subject: {_subject}\n"
"Content: {_content}"
)
def __init__(
self,
*args: Any,
max_count: int = 0,
message_format: str = DEFAULT_MESSAGE_FORMAT,
**kwargs: Any
) -> None:
"""Init params."""
super().__init__(*args, **kwargs)
self.max_count = max_count
self.message_format = message_format
def _init_parser(self) -> Dict:
"""Initialize parser."""
try:
from bs4 import BeautifulSoup # noqa: F401
except ImportError:
raise ImportError(
"`beautifulsoup4` package not found: `pip install beautifulsoup4`"
)
return {}
def parse_file(self, filepath: Path, errors: str = "ignore") -> List[str]:
"""Parse file into string."""
# Import required libraries
import mailbox
from email.parser import BytesParser
from email.policy import default
from bs4 import BeautifulSoup
i = 0
results: List[str] = []
# Load file using mailbox
bytes_parser = BytesParser(policy=default).parse
mbox = mailbox.mbox(filepath, factory=bytes_parser) # type: ignore
# Iterate through all messages
for _, _msg in enumerate(mbox):
msg: mailbox.mboxMessage = _msg
# Parse multipart messages
if msg.is_multipart():
for part in msg.walk():
ctype = part.get_content_type()
cdispo = str(part.get("Content-Disposition"))
if ctype == "text/plain" and "attachment" not in cdispo:
content = part.get_payload(decode=True) # decode
break
# Get plain message payload for non-multipart messages
else:
content = msg.get_payload(decode=True)
# Parse message HTML content and remove unneeded whitespace
soup = BeautifulSoup(content)
stripped_content = " ".join(soup.get_text().split())
# Format message to include date, sender, receiver and subject
msg_string = self.message_format.format(
_date=msg["date"],
_from=msg["from"],
_to=msg["to"],
_subject=msg["subject"],
_content=stripped_content,
)
# Add message string to results
results.append(msg_string)
# Increment counter and return if max count is met
i += 1
if self.max_count > 0 and i >= self.max_count:
break
return results
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