"""Send Gmail messages."""
import base64
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from typing import Any, Dict, List, Optional, Type, Union
from langchain_core.callbacks import CallbackManagerForToolRun
from langchain_core.pydantic_v1 import BaseModel, Field
from langchain_google_community.gmail.base import GmailBaseTool
[docs]class SendMessageSchema(BaseModel):
"""Input for SendMessageTool."""
message: str = Field(
...,
description="The message to send.",
)
to: Union[str, List[str]] = Field(
...,
description="The list of recipients.",
)
subject: str = Field(
...,
description="The subject of the message.",
)
cc: Optional[Union[str, List[str]]] = Field(
default=None,
description="The list of CC recipients.",
)
bcc: Optional[Union[str, List[str]]] = Field(
default=None,
description="The list of BCC recipients.",
)
[docs]class GmailSendMessage(GmailBaseTool):
"""Tool that sends a message to Gmail."""
name: str = "send_gmail_message"
description: str = (
"Use this tool to send email messages." " The input is the message, recipients"
)
args_schema: Type[SendMessageSchema] = SendMessageSchema
def _prepare_message(
self,
message: str,
to: Union[str, List[str]],
subject: str,
cc: Optional[Union[str, List[str]]] = None,
bcc: Optional[Union[str, List[str]]] = None,
) -> Dict[str, Any]:
"""Create a message for an email."""
mime_message = MIMEMultipart()
mime_message.attach(MIMEText(message, "html"))
mime_message["To"] = ", ".join(to if isinstance(to, list) else [to])
mime_message["Subject"] = subject
if cc is not None:
mime_message["Cc"] = ", ".join(cc if isinstance(cc, list) else [cc])
if bcc is not None:
mime_message["Bcc"] = ", ".join(bcc if isinstance(bcc, list) else [bcc])
encoded_message = base64.urlsafe_b64encode(mime_message.as_bytes()).decode()
return {"raw": encoded_message}
def _run(
self,
message: str,
to: Union[str, List[str]],
subject: str,
cc: Optional[Union[str, List[str]]] = None,
bcc: Optional[Union[str, List[str]]] = None,
run_manager: Optional[CallbackManagerForToolRun] = None,
) -> str:
"""Run the tool."""
try:
create_message = self._prepare_message(message, to, subject, cc=cc, bcc=bcc)
send_message = (
self.api_resource.users()
.messages()
.send(userId="me", body=create_message)
)
sent_message = send_message.execute()
return f'Message sent. Message Id: {sent_message["id"]}'
except Exception as error:
raise Exception(f"An error occurred: {error}")
