catalog/mail/sendmail.yaml

apiVersion: tekton.dev/v1alpha1
kind: Task
metadata:
  name: sendmail
spec:
  inputs:
    params:
    - name: server
      type: string
      description: secret name for SMTP server information (url, port, password)
    - name: subject
      type: string
      description: plain text email subject
    - name: body
      type: string
      description: plain text email body
    - name: sender
      type: string
      description: sender email address
    - name: recipients
      type: string
      description: recipient email addresses (space delimited list)
  steps:
  - name: send
    image: python:3.8-alpine
    script: |
      #!/usr/bin/env python3
      import smtplib, ssl, os
      port = os.getenv('PORT')
      smtp_server = os.getenv('SERVER')
      sender_email = "$(inputs.params.sender)"
      receiver_emails = "$(inputs.params.recipients)"
      user = os.getenv('USER')
      password = os.getenv('PASSWORD')
      tls = os.getenv('TLS')
      message = f"""\
      Subject: $(inputs.params.subject)
      To: {receiver_emails}
      From: {sender_email}

      $(inputs.params.body)"""
      print(message)
      if tls == 'True':
          context = ssl.create_default_context()
          server = smtplib.SMTP_SSL(smtp_server, port, context=context)
      else:
          server = smtplib.SMTP(smtp_server, port)
      if password != '':
          server.login(user, password)
      for receiver in receiver_emails.split(' '):
          server.sendmail(sender_email, receiver, message)
      server.quit()      
    env:
    - name: USER
      valueFrom:
        secretKeyRef:
          name: $(inputs.params.server)
          key: user
    - name: PASSWORD
      valueFrom:
        secretKeyRef:
          name: $(inputs.params.server)
          key: password
    - name: TLS
      valueFrom:
        secretKeyRef:
          name: $(inputs.params.server)
          key: tls
    - name: SERVER
      valueFrom:
        secretKeyRef:
          name: $(inputs.params.server)
          key: url
    - name: PORT
      valueFrom:
        secretKeyRef:
          name: $(inputs.params.server)
          key: port