mirror of
https://github.com/simple-login/app.git
synced 2024-09-05 01:51:30 +02:00
435 lines
12 KiB
Python
435 lines
12 KiB
Python
import os
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from email.message import Message
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from email.mime.base import MIMEBase
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from email.mime.multipart import MIMEMultipart
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from email.mime.text import MIMEText
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from email.utils import make_msgid, formatdate, parseaddr, formataddr
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from smtplib import SMTP
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from typing import Optional
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import dkim
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from jinja2 import Environment, FileSystemLoader
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from app.config import (
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SUPPORT_EMAIL,
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ROOT_DIR,
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POSTFIX_SERVER,
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NOT_SEND_EMAIL,
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DKIM_SELECTOR,
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DKIM_PRIVATE_KEY,
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DKIM_HEADERS,
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ALIAS_DOMAINS,
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SUPPORT_NAME,
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POSTFIX_SUBMISSION_TLS,
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)
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from app.log import LOG
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from app.models import Mailbox, User
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def render(template_name, **kwargs) -> str:
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templates_dir = os.path.join(ROOT_DIR, "templates", "emails")
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env = Environment(loader=FileSystemLoader(templates_dir))
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template = env.get_template(template_name)
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return template.render(**kwargs)
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def send_welcome_email(user):
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send_email(
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user.email,
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f"Welcome to SimpleLogin {user.name}",
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render("com/welcome.txt", name=user.name, user=user),
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render("com/welcome.html", name=user.name, user=user),
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)
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def send_trial_end_soon_email(user):
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send_email(
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user.email,
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f"Your trial will end soon {user.name}",
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render("transactional/trial-end.txt", name=user.name, user=user),
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render("transactional/trial-end.html", name=user.name, user=user),
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)
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def send_activation_email(email, name, activation_link):
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send_email(
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email,
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f"Just one more step to join SimpleLogin {name}",
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render(
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"transactional/activation.txt",
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name=name,
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activation_link=activation_link,
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email=email,
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),
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render(
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"transactional/activation.html",
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name=name,
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activation_link=activation_link,
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email=email,
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),
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)
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def send_reset_password_email(email, name, reset_password_link):
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send_email(
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email,
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f"Reset your password on SimpleLogin",
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render(
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"transactional/reset-password.txt",
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name=name,
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reset_password_link=reset_password_link,
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),
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render(
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"transactional/reset-password.html",
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name=name,
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reset_password_link=reset_password_link,
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),
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)
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def send_change_email(new_email, current_email, name, link):
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send_email(
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new_email,
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f"Confirm email update on SimpleLogin",
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render(
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"transactional/change-email.txt",
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name=name,
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link=link,
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new_email=new_email,
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current_email=current_email,
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),
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render(
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"transactional/change-email.html",
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name=name,
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link=link,
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new_email=new_email,
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current_email=current_email,
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),
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)
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def send_new_app_email(email, name):
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send_email(
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email,
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f"Any question/feedback for SimpleLogin {name}?",
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render("com/new-app.txt", name=name),
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render("com/new-app.html", name=name),
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)
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def send_test_email_alias(email, name):
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send_email(
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email,
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f"This email is sent to {email}",
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render("transactional/test-email.txt", name=name, alias=email),
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render("transactional/test-email.html", name=name, alias=email),
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)
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def send_cannot_create_directory_alias(user, alias, directory):
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"""when user cancels their subscription, they cannot create alias on the fly.
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If this happens, send them an email to notify
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"""
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send_email(
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user.email,
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f"Alias {alias} cannot be created",
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render(
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"transactional/cannot-create-alias-directory.txt",
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name=user.name,
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alias=alias,
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directory=directory,
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),
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render(
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"transactional/cannot-create-alias-directory.html",
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name=user.name,
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alias=alias,
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directory=directory,
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),
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)
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def send_cannot_create_domain_alias(user, alias, domain):
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"""when user cancels their subscription, they cannot create alias on the fly with custom domain.
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If this happens, send them an email to notify
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"""
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send_email(
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user.email,
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f"Alias {alias} cannot be created",
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render(
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"transactional/cannot-create-alias-domain.txt",
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name=user.name,
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alias=alias,
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domain=domain,
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),
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render(
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"transactional/cannot-create-alias-domain.html",
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name=user.name,
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alias=alias,
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domain=domain,
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),
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)
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def send_email(
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to_email, subject, plaintext, html=None, bounced_email: Optional[Message] = None
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):
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if NOT_SEND_EMAIL:
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LOG.d(
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"send email with subject %s to %s, plaintext: %s",
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subject,
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to_email,
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plaintext,
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)
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return
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LOG.d("send email to %s, subject %s", to_email, subject)
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if POSTFIX_SUBMISSION_TLS:
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smtp = SMTP(POSTFIX_SERVER, 587)
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smtp.starttls()
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else:
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smtp = SMTP(POSTFIX_SERVER, 25)
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if bounced_email:
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msg = MIMEMultipart("mixed")
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# add email main body
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body = MIMEMultipart("alternative")
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body.attach(MIMEText(plaintext, "text"))
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if html:
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body.attach(MIMEText(html, "html"))
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msg.attach(body)
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# add attachment
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rfcmessage = MIMEBase("message", "rfc822")
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rfcmessage.attach(bounced_email)
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msg.attach(rfcmessage)
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else:
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msg = MIMEMultipart("alternative")
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msg.attach(MIMEText(plaintext, "text"))
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if html:
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msg.attach(MIMEText(html, "html"))
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msg["Subject"] = subject
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msg["From"] = f"{SUPPORT_NAME} <{SUPPORT_EMAIL}>"
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msg["To"] = to_email
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msg_id_header = make_msgid()
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msg["Message-ID"] = msg_id_header
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date_header = formatdate()
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msg["Date"] = date_header
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# add DKIM
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email_domain = SUPPORT_EMAIL[SUPPORT_EMAIL.find("@") + 1 :]
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add_dkim_signature(msg, email_domain)
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msg_raw = msg.as_bytes()
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smtp.sendmail(SUPPORT_EMAIL, to_email, msg_raw)
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def get_email_local_part(address):
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"""
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Get the local part from email
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ab@cd.com -> ab
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"""
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return address[: address.find("@")]
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def get_email_domain_part(address):
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"""
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Get the domain part from email
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ab@cd.com -> cd.com
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"""
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return address[address.find("@") + 1 :]
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def add_dkim_signature(msg: Message, email_domain: str):
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delete_header(msg, "DKIM-Signature")
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# Specify headers in "byte" form
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# Generate message signature
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sig = dkim.sign(
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msg.as_bytes(),
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DKIM_SELECTOR,
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email_domain.encode(),
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DKIM_PRIVATE_KEY.encode(),
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include_headers=DKIM_HEADERS,
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)
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sig = sig.decode()
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# remove linebreaks from sig
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sig = sig.replace("\n", " ").replace("\r", "")
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msg["DKIM-Signature"] = sig[len("DKIM-Signature: ") :]
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def add_or_replace_header(msg: Message, header: str, value: str):
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"""
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Remove all occurrences of `header` and add `header` with `value`.
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"""
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delete_header(msg, header)
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msg[header] = value
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def delete_header(msg: Message, header: str):
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"""a header can appear several times in message."""
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# inspired from https://stackoverflow.com/a/47903323/1428034
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for i in reversed(range(len(msg._headers))):
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header_name = msg._headers[i][0].lower()
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if header_name == header.lower():
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del msg._headers[i]
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def delete_all_headers_except(msg: Message, headers: [str]):
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headers = [h.lower() for h in headers]
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for i in reversed(range(len(msg._headers))):
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header_name = msg._headers[i][0].lower()
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if header_name not in headers:
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del msg._headers[i]
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def email_belongs_to_alias_domains(address: str) -> bool:
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"""return True if an email ends with one of the alias domains provided by SimpleLogin"""
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for domain in ALIAS_DOMAINS:
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if address.endswith("@" + domain):
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return True
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return False
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def can_be_used_as_personal_email(email: str) -> bool:
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"""return True if an email can be used as a personal email. Currently the only condition is email domain is not
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- one of ALIAS_DOMAINS
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- one of custom domains
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"""
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domain = get_email_domain_part(email)
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if not domain:
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return False
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if domain in ALIAS_DOMAINS:
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return False
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from app.models import CustomDomain
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if CustomDomain.get_by(domain=domain, verified=True):
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return False
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return True
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def email_already_used(email: str) -> bool:
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"""test if an email can be used when:
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- user signs up
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- add a new mailbox
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"""
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if User.get_by(email=email):
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return True
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if Mailbox.get_by(email=email):
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return True
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return False
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def mailbox_already_used(email: str, user) -> bool:
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if Mailbox.get_by(email=email):
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return True
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# support the case user wants to re-add their real email as mailbox
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# can happen when user changes their root email and wants to add this new email as mailbox
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if email == user.email:
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return False
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if User.get_by(email=email):
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return True
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return False
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def get_orig_message_from_bounce(msg: Message) -> Message:
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"""parse the original email from Bounce"""
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i = 0
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for part in msg.walk():
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i += 1
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# the original message is the 4th part
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# 1st part is the root part, multipart/report
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# 2nd is text/plain, Postfix log
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# ...
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# 7th is original message
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if i == 7:
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return part
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def get_orig_message_from_spamassassin_report(msg: Message) -> Message:
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"""parse the original email from Spamassassin report"""
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i = 0
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for part in msg.walk():
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i += 1
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# the original message is the 4th part
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# 1st part is the root part, multipart/report
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# 2nd is text/plain, SpamAssassin part
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# 3rd is the original message in message/rfc822 content type
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# 4th is original message
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if i == 4:
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return part
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def new_addr(old_addr, new_email, user: User) -> str:
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"""replace First Last <first@example.com> by
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first@example.com by SimpleLogin <new_email>
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`new_email` is a special reply address
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"""
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name, old_email = parseaddr(old_addr)
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if user.use_via_format_for_sender:
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new_name = f"{old_email} via SimpleLogin"
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else:
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name = name or ""
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new_name = (
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name + (" - " if name else "") + old_email.replace("@", " at ")
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).strip()
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new_addr = formataddr((new_name, new_email)).strip()
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return new_addr.strip()
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def get_addrs_from_header(msg: Message, header) -> [str]:
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"""Get all addresses contained in `header`
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Used for To or CC header.
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"""
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ret = []
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header_content = msg.get_all(header)
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if not header_content:
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return ret
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for addrs in header_content:
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for addr in addrs.split(","):
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ret.append(addr.strip())
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# do not return empty string
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return [r for r in ret if r]
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def get_spam_info(msg: Message) -> (bool, str):
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"""parse SpamAssassin header to detect whether a message is classified as spam.
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Return (is spam, spam status detail)
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The header format is
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```X-Spam-Status: No, score=-0.1 required=5.0 tests=DKIM_SIGNED,DKIM_VALID,
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DKIM_VALID_AU,RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H2,SPF_PASS,
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URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.2```
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"""
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spamassassin_status = msg["X-Spam-Status"]
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if not spamassassin_status:
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return False, ""
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# yes or no
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spamassassin_answer = spamassassin_status[: spamassassin_status.find(",")]
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return spamassassin_answer.lower() == "yes", spamassassin_status
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