mirror of
https://github.com/simple-login/app.git
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200 lines
5.0 KiB
Python
200 lines
5.0 KiB
Python
import os
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from email.message import EmailMessage
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from email.utils import make_msgid, formatdate
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from smtplib import SMTP
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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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)
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from app.log import LOG
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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(email, name):
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send_email(
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email,
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f"{name}, welcome to SimpleLogin!",
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_render("welcome.txt", name=name),
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_render("welcome.html", name=name),
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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"{name}, just one more step to join SimpleLogin",
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_render(
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"activation.txt", name=name, activation_link=activation_link, email=email
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),
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_render(
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"activation.html", name=name, activation_link=activation_link, 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"{name}, reset your password on SimpleLogin",
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_render(
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"reset-password.txt", name=name, reset_password_link=reset_password_link
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),
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_render(
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"reset-password.html", name=name, 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"{name}, confirm email update on SimpleLogin",
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_render(
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"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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"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"{name}, any question/feedback for SimpleLogin?",
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_render("new-app.txt", name=name),
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_render("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"{name}, this email is sent to {email}",
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_render("test-email.txt", name=name, alias=email),
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_render("test-email.html", name=name, alias=email),
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)
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def send_email(to_email, subject, plaintext, html):
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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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# host IP, setup via Docker network
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smtp = SMTP(POSTFIX_SERVER, 25)
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msg = EmailMessage()
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msg["Subject"] = subject
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msg["From"] = f"Son from SimpleLogin <{SUPPORT_EMAIL}>"
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msg["To"] = to_email
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msg.set_content(plaintext)
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if html is not None:
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msg.add_alternative(html, subtype="html")
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msg_id_header = make_msgid()
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LOG.d("message-id %s", msg_id_header)
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msg["Message-ID"] = msg_id_header
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date_header = formatdate()
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LOG.d("Date header: %s", date_header)
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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_string().encode()
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smtp.sendmail(SUPPORT_EMAIL, to_email, msg_raw)
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def get_email_name(email_from):
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"""parse email from header and return the name part
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First Last <ab@cd.com> -> First Last
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ab@cd.com -> ""
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"""
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if "<" in email_from:
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return email_from[: email_from.find("<")].strip()
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return ""
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def get_email_part(email_from):
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"""parse email from header and return the email part
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First Last <ab@cd.com> -> ab@cd.com
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ab@cd.com -> ""
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"""
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if "<" in email_from:
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return email_from[email_from.find("<") + 1 : email_from.find(">")].strip()
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return email_from
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def get_email_local_part(email):
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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 email[: email.find("@")]
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def get_email_domain_part(email):
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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 email[email.find("@") + 1 :]
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def add_dkim_signature(msg: EmailMessage, email_domain: str):
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if msg["DKIM-Signature"]:
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LOG.d("Remove DKIM-Signature %s", msg["DKIM-Signature"])
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del 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_string().encode(),
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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.add_header("DKIM-Signature", sig[len("DKIM-Signature: ") :])
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