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"""
Module for Sending Messages via SMTP

.. versionadded:: 2014.7.0

:depends:   - smtplib python module
:configuration: This module can be used by either passing a jid and password
    directly to send_message, or by specifying the name of a configuration
    profile in the minion config, minion pillar, or master config.

    For example:

    .. code-block:: yaml

        my-smtp-login:
            smtp.server: smtp.domain.com
            smtp.tls: True
            smtp.sender: admin@domain.com
            smtp.username: myuser
            smtp.password: verybadpass

    The resourcename refers to the resource that is using this account. It is
    user-definable, and optional. The following configurations are both valid:

    .. code-block:: yaml

        my-smtp-login:
            smtp.server: smtp.domain.com
            smtp.tls: True
            smtp.sender: admin@domain.com
            smtp.username: myuser
            smtp.password: verybadpass

        another-smtp-login:
            smtp.server: smtp.domain.com
            smtp.tls: True
            smtp.sender: admin@domain.com
            smtp.username: myuser
            smtp.password: verybadpass

"""

import logging
import os
import socket

import salt.utils.files

log = logging.getLogger(__name__)

HAS_LIBS = False
try:
    import email.mime.application
    import email.mime.multipart
    import email.mime.text
    import smtplib

    HAS_LIBS = True
except ImportError:
    pass


__virtualname__ = "smtp"


def __virtual__():
    """
    Only load this module if smtplib is available on this minion.
    """
    if HAS_LIBS:
        return __virtualname__
    return (False, "This module is only loaded if smtplib is available")


def send_msg(
    recipient,
    message,
    subject="Message from Salt",
    sender=None,
    server=None,
    use_ssl="True",
    username=None,
    password=None,
    profile=None,
    attachments=None,
):
    """
    Send a message to an SMTP recipient. To send a message to multiple \
    recipients, the recipients should be in a comma-seperated Python string. \
    Designed for use in states.

    CLI Examples:

    .. code-block:: bash

        salt '*' smtp.send_msg 'admin@example.com' 'This is a salt module test' profile='my-smtp-account'
        salt '*' smtp.send_msg 'admin@example.com,admin2@example.com' 'This is a salt module test for multiple recipients' profile='my-smtp-account'
        salt '*' smtp.send_msg 'admin@example.com' 'This is a salt module test' username='myuser' password='verybadpass' sender='admin@example.com' server='smtp.domain.com'
        salt '*' smtp.send_msg 'admin@example.com' 'This is a salt module test' username='myuser' password='verybadpass' sender='admin@example.com' server='smtp.domain.com' attachments="['/var/log/messages']"
    """
    if profile:
        creds = __salt__["config.option"](profile)
        server = creds.get("smtp.server")
        use_ssl = creds.get("smtp.tls")
        sender = creds.get("smtp.sender")
        username = creds.get("smtp.username")
        password = creds.get("smtp.password")

    if attachments:
        msg = email.mime.multipart.MIMEMultipart()
        msg.attach(email.mime.text.MIMEText(message))
    else:
        msg = email.mime.text.MIMEText(message)
    msg["Subject"] = subject
    msg["From"] = sender
    msg["To"] = recipient
    recipients = [r.strip() for r in recipient.split(",")]

    try:
        if use_ssl in ["True", "true"]:
            smtpconn = smtplib.SMTP_SSL(server)
        else:
            smtpconn = smtplib.SMTP(server)

    except socket.gaierror as _error:
        log.debug("Exception: %s", _error)
        return False

    if use_ssl not in ("True", "true"):
        smtpconn.ehlo()
        if smtpconn.has_extn("STARTTLS"):
            try:
                smtpconn.starttls()
            except smtplib.SMTPHeloError:
                log.debug("The server didn’t reply properly to the HELO greeting.")
                return False
            except smtplib.SMTPException:
                log.debug("The server does not support the STARTTLS extension.")
                return False
            except RuntimeError:
                log.debug(
                    "SSL/TLS support is not available to your Python interpreter."
                )
                return False
            smtpconn.ehlo()

    if username and password:
        try:
            smtpconn.login(username, password)
        except smtplib.SMTPAuthenticationError as _error:
            log.debug("SMTP Authentication Failure")
            return False

    if attachments:
        for f in attachments:
            name = os.path.basename(f)
            with salt.utils.files.fopen(f, "rb") as fin:
                att = email.mime.application.MIMEApplication(fin.read(), Name=name)
            att["Content-Disposition"] = f'attachment; filename="{name}"'
            msg.attach(att)

    try:
        smtpconn.sendmail(sender, recipients, msg.as_string())
    except smtplib.SMTPRecipientsRefused:
        log.debug("All recipients were refused.")
        return False
    except smtplib.SMTPHeloError:
        log.debug("The server didn’t reply properly to the HELO greeting.")
        return False
    except smtplib.SMTPSenderRefused:
        log.debug("The server didn’t accept the %s.", sender)
        return False
    except smtplib.SMTPDataError:
        log.debug("The server replied with an unexpected error code.")
        return False

    smtpconn.quit()
    return True