basic_mail.py

"""
    Ejemplo tomado de : https://medium.com/lyfepedia/sending-emails-with-gmail-api-and-python-49474e32c81f
"""

from __future__ import print_function
from googleapiclient.discovery import build
from apiclient import errors
from httplib2 import Http
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
import base64
from google.oauth2 import service_account

from login import login


def create_message(sender, to, subject, message_text):
  """Create a message for an email.

  Args:
    sender: Email address of the sender.
    to: Email address of the receiver.
    subject: The subject of the email message.
    message_text: The text of the email message.

  Returns:
    An object containing a base64url encoded email object.
  """
  
  message = MIMEMultipart()
  message['to'] = to
  message['from'] = sender
  message['subject'] = subject

  msg = MIMEText(message_text)
  message.attach(msg)
  

  return {
    #'raw': base64.urlsafe_b64encode(message.as_string())
    'raw': base64.urlsafe_b64encode(message.as_string().encode()).decode()
  }

def send_message(service, user_id, message):
  """Send an email message.

  Args:
    service: Authorized Gmail API service instance.
    user_id: User's email address. The special value "me"
    can be used to indicate the authenticated user.
    message: Message to be sent.

  Returns:
    Sent Message.
  """
  try:
    message = (service.users().messages().send(userId=user_id, body=message)
               .execute())
    print('Message Id: %s' % message['id'])
    return message
  except errors.HttpError as error:
    print('An error occurred: %s' % error)

def service_account_login():
  SCOPES = ['https://www.googleapis.com/auth/gmail.send']
  SERVICE_ACCOUNT_FILE = 'service-key.json'

  credentials = service_account.Credentials.from_service_account_file(
          SERVICE_ACCOUNT_FILE, scopes=SCOPES)
  delegated_credentials = credentials.with_subject(EMAIL_FROM)
  service = build('gmail', 'v1', credentials=delegated_credentials)
  return service


if __name__ == "__main__":
  # Email variables. Modify this!
  EMAIL_FROM = 'gml.automat@gmail.com'
  EMAIL_TO = EMAIL_FROM
  EMAIL_SUBJECT = 'Hola robot!'
  EMAIL_CONTENT = 'Esto es una prueba'
  
  #service = service_account_login()
  service = login()
  # Call the Gmail API
  message = create_message(EMAIL_FROM, EMAIL_TO, EMAIL_SUBJECT, EMAIL_CONTENT)
  sent = send_message(service,'me', message)