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"""Gmail source."""
import base64
import dataclasses
import os.path
import random
import re
from datetime import datetime
from time import sleep
from typing import TYPE_CHECKING, Any, Iterable, Optional
from pydantic import Field as PydanticField
from typing_extensions import override
from ..config import data_path
from ..schema import Item, field
from ..utils import log
from .source import Source, SourceSchema
if TYPE_CHECKING:
from google.oauth2.credentials import Credentials
# If modifying these scopes, delete the token json file.
_SCOPES = ['https://www.googleapis.com/auth/gmail.readonly']
_GMAIL_CONFIG_DIR = os.path.join(data_path(), '.gmail')
_TOKEN_FILENAME = 'token.json'
_CREDS_FILENAME = 'credentials.json'
_NUM_RETRIES = 10
_MAX_NUM_THREADS = 30_000
_UNWRAP_PATTERN = re.compile(r'(\S)\n(\S)')
HTTP_PATTERN = re.compile(r'https?://[^\s]+')
class Gmail(Source):
"""Connects to your Gmail and loads the text of your emails.
**One time setup**
Download the OAuth credentials file from the
[Google Cloud Console](https://console.cloud.google.com/apis/credentials) and save it to the
correct location. See
[guide](https://developers.google.com/gmail/api/quickstart/python#authorize_credentials_for_a_desktop_application)
for details.
"""
name = 'gmail'
credentials_file: str = PydanticField(
description='Path to the OAuth credentials file.',
default=os.path.join(_GMAIL_CONFIG_DIR, _CREDS_FILENAME))
_creds: Optional['Credentials'] = None
class Config:
# Language is required even though it has a default value.
schema_extra = {'required': ['credentials_file']}
@override
def setup(self) -> None:
try:
from google.auth.transport.requests import Request
from google.oauth2.credentials import Credentials
from google_auth_oauthlib.flow import InstalledAppFlow
except ImportError:
raise ImportError('Could not import dependencies for the "gmail" source. '
'Please install with pip install lilac[gmail]')
# The token file stores the user's access and refresh tokens, and is created automatically when
# the authorization flow completes for the first time.
token_filepath = os.path.join(_GMAIL_CONFIG_DIR, _TOKEN_FILENAME)
if os.path.exists(token_filepath):
self._creds = Credentials.from_authorized_user_file(token_filepath, _SCOPES)
# If there are no (valid) credentials available, let the user log in.
if not self._creds or not self._creds.valid:
if self._creds and self._creds.expired and self._creds.refresh_token:
self._creds.refresh(Request())
else:
if not os.path.exists(self.credentials_file):
raise ValueError(
f'Could not find the OAuth credentials file at "{self.credentials_file}". Make sure to '
'download it from the Google Cloud Console and save it to the correct location.')
flow = InstalledAppFlow.from_client_secrets_file(self.credentials_file, _SCOPES)
self._creds = flow.run_local_server()
os.makedirs(os.path.dirname(token_filepath), exist_ok=True)
# Save the token for the next run.
with open(token_filepath, 'w') as token:
token.write(self._creds.to_json())
@override
def source_schema(self) -> SourceSchema:
return SourceSchema(
fields={
'body': field('string'),
'snippet': field('string'),
'dates': field(fields=['string']),
'subject': field('string'),
})
@override
def process(self) -> Iterable[Item]:
try:
from email_reply_parser import EmailReplyParser
from googleapiclient.discovery import build
from googleapiclient.errors import HttpError
except ImportError:
raise ImportError('Could not import dependencies for the "gmail" source. '
'Please install with pip install lilac[gmail]')
# Call the Gmail API
service = build('gmail', 'v1', credentials=self._creds)
# threads.list API
threads_resource = service.users().threads()
thread_batch: list[Item] = []
retry_batch: set[str] = set()
num_retries = 0
num_threads_fetched = 0
def _thread_fetched(request_id: str, response: Any, exception: Optional[HttpError]) -> None:
if exception is not None:
retry_batch.add(request_id)
return
replies: list[str] = []
dates: list[str] = []
snippets: list[str] = []
subject: Optional[str] = None
for msg in response['messages']:
epoch_sec = int(msg['internalDate']) / 1000.
date = datetime.fromtimestamp(epoch_sec).strftime('%Y-%m-%d %H:%M:%S')
dates.append(date)
if 'snippet' in msg:
snippets.append(msg['snippet'])
email_info = _parse_payload(msg['payload'])
subject = subject or email_info.subject
parsed_parts: list[str] = []
for body in email_info.parts:
if not body:
continue
text = base64.urlsafe_b64decode(body).decode('utf-8')
text = EmailReplyParser.parse_reply(text)
# Unwrap text.
text = _UNWRAP_PATTERN.sub('\\1 \\2', text)
# Remove URLs.
text = HTTP_PATTERN.sub('', text)
if text:
parsed_parts.append(text)
if email_info.sender and parsed_parts:
parsed_parts = [
f'--------------------{email_info.sender}--------------------', *parsed_parts
]
if parsed_parts:
replies.append('\n'.join(parsed_parts))
if replies:
thread_batch.append({
'body': '\n\n'.join(replies),
'snippet': '\n'.join(snippets) if snippets else None,
'dates': dates,
'subject': subject,
})
if request_id in retry_batch:
retry_batch.remove(request_id)
# First request.
thread_list_req = threads_resource.list(userId='me', includeSpamTrash=False) or None
thread_list = thread_list_req.execute(num_retries=_NUM_RETRIES) if thread_list_req else None
while (num_threads_fetched < _MAX_NUM_THREADS and thread_list and thread_list_req):
batch = service.new_batch_http_request(callback=_thread_fetched)
threads = thread_list['threads'] if 'threads' in thread_list else []
for gmail_thread in threads:
thread_id = gmail_thread['id'] if 'id' in gmail_thread else None
if not thread_id:
continue
if not retry_batch or (thread_id in retry_batch):
batch.add(
service.users().threads().get(userId='me', id=thread_id, format='full'),
request_id=thread_id)
batch.execute()
num_threads_fetched += len(thread_batch)
yield from thread_batch
thread_batch = []
if retry_batch:
log(f'Failed to fetch {len(retry_batch)} threads. Retrying...')
timeout = 2**(num_retries - 1) + random.uniform(0, 1)
sleep(timeout)
num_retries += 1
else:
retry_batch = set()
num_retries = 0
# Fetch next page.
thread_list_req = threads_resource.list_next(thread_list_req, thread_list)
thread_list = thread_list_req.execute(num_retries=_NUM_RETRIES) if thread_list_req else None
@dataclasses.dataclass
class EmailInfo:
"""Stores parsed information about an email."""
sender: Optional[str] = None
subject: Optional[str] = None
parts: list[bytes] = dataclasses.field(default_factory=list)
def _get_header(payload: Any, name: str) -> Optional[str]:
if 'headers' not in payload:
return None
values = [h['value'] for h in payload['headers'] if h['name'].lower().strip() == name]
return values[0] if values else None
def _parse_payload(payload: Any) -> EmailInfo:
sender = _get_header(payload, 'from')
subject = _get_header(payload, 'subject')
parts: list[bytes] = []
# Process the message body.
if 'mimeType' in payload and 'text/plain' in payload['mimeType']:
if 'body' in payload and 'data' in payload['body']:
parts.append(payload['body']['data'].encode('ascii'))
# Process the message parts.
for part in payload.get('parts', []):
email_info = _parse_payload(part)
sender = sender or email_info.sender
subject = subject or email_info.subject
parts.extend(email_info.parts)
return EmailInfo(sender, subject, parts)
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