contentdb/app/tasks/emails.py
2024-05-24 16:24:38 +01:00

223 lines
7.2 KiB
Python

# ContentDB
# Copyright (C) 2018-21 rubenwardy
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
import smtplib
import typing
from typing import Dict
from flask import render_template
from flask_babel import force_locale, gettext, lazy_gettext, LazyString
from flask_mail import Message
from markupsafe import escape
from app import mail
from app.models import Notification, db, EmailSubscription, User
from app.rediscache import increment_key
from app.tasks import celery
from app.utils import abs_url_for, abs_url, random_string
def get_email_subscription(email):
assert type(email) == str
ret = EmailSubscription.query.filter_by(email=email).first()
if not ret:
ret = EmailSubscription(email)
ret.token = random_string(32)
db.session.add(ret)
db.session.commit()
return ret
def gen_headers(sub: EmailSubscription, is_bulk: bool) -> Dict[str,str]:
headers = {"List-Help": f"<{abs_url_for('flatpage', path='help/faq/')}>", "List-Unsubscribe": f"<{sub.url}>"}
if is_bulk:
headers["Precedence"] = "Bulk"
return headers
@celery.task()
def send_verify_email(email, token, locale):
sub = get_email_subscription(email)
if sub.blacklisted:
return
with force_locale(locale or "en"):
msg = Message("Confirm email address", recipients=[email], extra_headers=gen_headers(sub, False))
msg.body = """
This email has been sent to you because someone (hopefully you)
has entered your email address as a user's email.
If it wasn't you, then just delete this email.
If this was you, then please click this link to confirm the address:
{}
""".format(abs_url_for('users.verify_email', token=token))
msg.html = render_template("emails/verify.html", token=token, sub=sub)
mail.send(msg)
increment_key("emails_sent")
@celery.task()
def send_unsubscribe_verify(email, locale):
sub = get_email_subscription(email)
if sub.blacklisted:
return
with force_locale(locale or "en"):
msg = Message("Confirm unsubscribe", recipients=[email], extra_headers=gen_headers(sub, False))
msg.body = """
We're sorry to see you go. You just need to do one more thing before your email is blacklisted.
Click this link to blacklist email: {}
""".format(abs_url_for('users.unsubscribe', token=sub.token))
msg.html = render_template("emails/verify_unsubscribe.html", sub=sub)
mail.send(msg)
increment_key("emails_sent")
@celery.task(rate_limit="25/m")
def send_email_with_reason(email: str, locale: str, subject: str, text: str, html: str,
reason: typing.Union[str, LazyString], conn: any):
sub = get_email_subscription(email)
if sub.blacklisted:
return
with force_locale(locale or "en"):
msg = Message(subject, recipients=[email], extra_headers=gen_headers(sub, conn is not None))
msg.body = text
html = html or f"<pre>{escape(text)}</pre>"
msg.html = render_template("emails/base.html", subject=subject, content=html, reason=reason, sub=sub)
if conn:
conn.send(msg)
else:
mail.send(msg)
increment_key("emails_sent")
@celery.task(rate_limit="25/m")
def send_user_email(email: str, locale: str, subject: str, text: str, html=None, conn=None):
return send_email_with_reason(email, locale, subject, text, html,
lazy_gettext("You are receiving this email because you are a registered user of ContentDB."), conn)
@celery.task(rate_limit="25/m")
def send_anon_email(email: str, locale: str, subject: str, text: str, html=None):
return send_email_with_reason(email, locale, subject, text, html,
lazy_gettext("You are receiving this email because someone (hopefully you) entered your email address as a user's email."), None)
def send_single_email(notification, locale):
sub = get_email_subscription(notification.user.email)
if sub.blacklisted:
return
with force_locale(locale or "en"):
msg = Message(notification.title, recipients=[notification.user.email], extra_headers=gen_headers(sub, False))
msg.body = """
New notification: {}
View: {}
Manage email settings: {}
Unsubscribe: {}
""".format(notification.title, abs_url(notification.url),
abs_url_for("users.email_notifications", username=notification.user.username),
abs_url_for("users.unsubscribe", token=sub.token))
msg.html = render_template("emails/notification.html", notification=notification, sub=sub)
mail.send(msg)
increment_key("emails_sent")
def send_notification_digest(notifications: [Notification], locale):
user = notifications[0].user
sub = get_email_subscription(user.email)
if sub.blacklisted:
return
with force_locale(locale or "en"):
msg = Message(gettext("%(num)d new notifications", num=len(notifications)), recipients=[user.email])
msg.body = "".join(["<{}> {}\n{}: {}\n\n".format(notification.causer.display_name, notification.title, gettext("View"), abs_url(notification.url)) for notification in notifications])
msg.body += "{}: {}\n{}: {}".format(
gettext("Manage email settings"),
abs_url_for("users.email_notifications", username=user.username),
gettext("Unsubscribe"),
abs_url_for("users.unsubscribe", token=sub.token))
msg.html = render_template("emails/notification_digest.html", notifications=notifications, user=user, sub=sub)
mail.send(msg)
increment_key("emails_sent")
@celery.task()
def send_pending_digests():
for user in User.query.filter(User.notifications.any(emailed=False)).all():
to_send = []
for notification in user.notifications:
if not notification.emailed and notification.can_send_digest():
to_send.append(notification)
notification.emailed = True
if len(to_send) > 0:
send_notification_digest(to_send, user.locale or "en")
db.session.commit()
@celery.task()
def send_pending_notifications():
for user in User.query.filter(User.notifications.any(emailed=False)).all():
to_send = []
for notification in user.notifications:
if not notification.emailed:
if notification.can_send_email():
to_send.append(notification)
notification.emailed = True
elif not notification.can_send_digest():
notification.emailed = True
db.session.commit()
try:
if len(to_send) > 1:
send_notification_digest(to_send, user.locale or "en")
elif len(to_send) > 0:
send_single_email(to_send[0], user.locale or "en")
except smtplib.SMTPDataError as e:
if "Message rejected under suspicion of SPAM" in str(e):
raise Exception(f"Failed to send email to {user.username} due to yandex spam filter") from e
else:
raise e
@celery.task()
def send_bulk_email(subject: str, text: str, html=None):
with mail.connect() as conn:
for user in User.query.filter(User.email.isnot(None)).all():
send_user_email(user.email, user.locale or "en", subject, text, html, conn)