sh_cpl/src/cpl/mailing/email_client_service.py

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import ssl
from smtplib import SMTP
from typing import Optional
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from cpl.environment.environment_abc import EnvironmentABC
from cpl.logging.logger_abc import LoggerABC
from cpl.mailing.email import EMail
from cpl.mailing.email_client_abc import EMailClientABC
from cpl.mailing.email_client_settings import EMailClientSettings
from cpl.utils.credential_manager import CredentialManager
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class EMailClient(EMailClientABC):
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def __init__(self, environment: EnvironmentABC, logger: LoggerABC, mail_settings: EMailClientSettings):
EMailClientABC.__init__(self)
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self._environment = environment
self._mail_settings = mail_settings
self._logger = logger
self._server: Optional[SMTP] = None
self.create()
def create(self):
self._logger.trace(__name__, f'Started {__name__}.create')
self.connect()
self._logger.trace(__name__, f'Stopped {__name__}.create')
def connect(self):
self._logger.trace(__name__, f'Started {__name__}.connect')
try:
self._logger.debug(__name__, f'Try to connect to {self._mail_settings.host}:{self._mail_settings.port}')
self._server = SMTP(self._mail_settings.host, self._mail_settings.port)
self._logger.info(__name__, f'Connected to {self._mail_settings.host}:{self._mail_settings.port}')
self._logger.debug(__name__, 'Try to start tls')
self._server.starttls(context=ssl.create_default_context())
self._logger.info(__name__, 'Started tls')
except Exception as e:
self._logger.error(__name__, 'Cannot connect to mail server', e)
self._logger.trace(__name__, f'Stopped {__name__}.connect')
def login(self):
self._logger.trace(__name__, f'Started {__name__}.login')
try:
self._logger.debug(__name__, f'Try to login {self._mail_settings.user_name}@{self._mail_settings.host}:{self._mail_settings.port}')
self._server.login(self._mail_settings.user_name, CredentialManager.decrypt(self._mail_settings.credentials))
self._logger.info(__name__, f'Logged on as {self._mail_settings.user_name} to {self._mail_settings.host}:{self._mail_settings.port}')
except Exception as e:
self._logger.error(__name__, 'Cannot login to mail server', e)
self._logger.trace(__name__, f'Stopped {__name__}.login')
def send_mail(self, email: EMail):
self._logger.trace(__name__, f'Started {__name__}.send_mail')
try:
self.login()
email.body += f'\n\nDies ist eine automatische E-Mail.' \
f'\nGesendet von {self._environment.application_name}-{self._environment.environment_name}@{self._environment.host_name} für ' \
f'{self._environment.customer}.'
self._logger.debug(__name__, f'Try to send email to {email.receiver_list}')
self._server.sendmail(self._mail_settings.user_name, email.receiver_list, email.get_content(self._mail_settings.user_name))
self._logger.info(__name__, f'Sent email to {email.receiver_list}')
except Exception as e:
self._logger.error(__name__, f'Cannot send mail to {email.receiver_list}', e)
self._logger.trace(__name__, f'Stopped {__name__}.send_mail')