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base.py
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base.py
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"""Google Mail reader."""
import base64
import email
from typing import Any, List, Optional
from llama_index.core.readers.base import BaseReader
from llama_index.core.schema import Document
from pydantic import BaseModel
SCOPES = ["https://www.googleapis.com/auth/gmail.readonly"]
class GmailReader(BaseReader, BaseModel):
"""Gmail reader.
Reads emails
Args:
max_results (int): Defaults to 10.
query (str): Gmail query. Defaults to None.
service (Any): Gmail service. Defaults to None.
results_per_page (Optional[int]): Max number of results per page. Defaults to 10.
use_iterative_parser (bool): Use iterative parser. Defaults to False.
"""
query: str = None
use_iterative_parser: bool = False
max_results: int = 10
service: Any
results_per_page: Optional[int]
def load_data(self) -> List[Document]:
"""Load emails from the user's account."""
from googleapiclient.discovery import build
credentials = self._get_credentials()
if not self.service:
self.service = build("gmail", "v1", credentials=credentials)
messages = self.search_messages()
results = []
for message in messages:
text = message.pop("body")
extra_info = message
results.append(Document(text=text, extra_info=extra_info or {}))
return results
def _get_credentials(self) -> Any:
"""Get valid user credentials from storage.
The file token.json stores the user's access and refresh tokens, and is
created automatically when the authorization flow completes for the first
time.
Returns:
Credentials, the obtained credential.
"""
import os
from google_auth_oauthlib.flow import InstalledAppFlow
from google.auth.transport.requests import Request
from google.oauth2.credentials import Credentials
creds = None
if os.path.exists("token.json"):
creds = Credentials.from_authorized_user_file("token.json", SCOPES)
# If there are no (valid) credentials available, let the user log in.
if not creds or not creds.valid:
if creds and creds.expired and creds.refresh_token:
creds.refresh(Request())
else:
flow = InstalledAppFlow.from_client_secrets_file(
"credentials.json", SCOPES
)
creds = flow.run_local_server(port=8080)
# Save the credentials for the next run
with open("token.json", "w") as token:
token.write(creds.to_json())
return creds
def search_messages(self):
query = self.query
max_results = self.max_results
if self.results_per_page:
max_results = self.results_per_page
results = (
self.service.users()
.messages()
.list(userId="me", q=query, maxResults=int(max_results))
.execute()
)
messages = results.get("messages", [])
if len(messages) < self.max_results:
# paginate if there are more results
while "nextPageToken" in results:
page_token = results["nextPageToken"]
results = (
self.service.users()
.messages()
.list(
userId="me",
q=query,
pageToken=page_token,
maxResults=int(max_results),
)
.execute()
)
messages.extend(results["messages"])
if len(messages) >= self.max_results:
break
result = []
try:
for message in messages:
message_data = self.get_message_data(message)
if not message_data:
continue
result.append(message_data)
except Exception as e:
raise Exception("Can't get message data" + str(e))
return result
def get_message_data(self, message):
message_id = message["id"]
message_data = (
self.service.users()
.messages()
.get(format="raw", userId="me", id=message_id)
.execute()
)
if self.use_iterative_parser:
body = self.extract_message_body_iterative(message_data)
else:
body = self.extract_message_body(message_data)
if not body:
return None
# https://developers.google.com/gmail/api/reference/rest/v1/users.messages
return {
"id": message_data["id"],
"threadId": message_data["threadId"],
"snippet": message_data["snippet"],
"internalDate": message_data["internalDate"],
"body": body,
}
def extract_message_body_iterative(self, message: dict):
if message["raw"]:
body = base64.urlsafe_b64decode(message["raw"].encode("utf-8"))
mime_msg = email.message_from_bytes(body)
else:
mime_msg = message
body_text = ""
if mime_msg.get_content_type() == "text/plain":
plain_text = mime_msg.get_payload(decode=True)
charset = mime_msg.get_content_charset("utf-8")
body_text = plain_text.decode(charset).encode("utf-8").decode("utf-8")
elif mime_msg.get_content_maintype() == "multipart":
msg_parts = mime_msg.get_payload()
for msg_part in msg_parts:
body_text += self.extract_message_body_iterative(msg_part)
return body_text
def extract_message_body(self, message: dict):
from bs4 import BeautifulSoup
try:
body = base64.urlsafe_b64decode(message["raw"].encode("utf-8"))
mime_msg = email.message_from_bytes(body)
# If the message body contains HTML, parse it with BeautifulSoup
if "text/html" in mime_msg:
soup = BeautifulSoup(body, "html.parser")
body = soup.get_text()
return body.decode("utf-8")
except Exception as e:
raise Exception("Can't parse message body" + str(e))
if __name__ == "__main__":
reader = GmailReader(query="from:me after:2023-01-01")
print(reader.load_data())