mirror of
https://github.com/zulip/zulip.git
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618 lines
23 KiB
Python
618 lines
23 KiB
Python
import datetime
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import hashlib
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import logging
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import os
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import smtplib
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from contextlib import suppress
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from email.headerregistry import Address
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from email.parser import Parser
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from email.policy import default
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from email.utils import formataddr, parseaddr
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from typing import Any, Callable, Dict, List, Mapping, Optional, Sequence, Tuple, Union
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import backoff
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import css_inline
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import orjson
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from django.conf import settings
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from django.core.mail import EmailMultiAlternatives, get_connection
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from django.core.mail.backends.base import BaseEmailBackend
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from django.core.mail.backends.smtp import EmailBackend
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from django.core.mail.message import sanitize_address
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from django.core.management import CommandError
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from django.db import transaction
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from django.db.models import QuerySet
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from django.http import HttpRequest
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from django.template import loader
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from django.utils.timezone import now as timezone_now
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from django.utils.translation import gettext as _
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from django.utils.translation import override as override_language
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from confirmation.models import generate_key
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from zerver.lib.logging_util import log_to_file
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from zerver.models import EMAIL_TYPES, Realm, ScheduledEmail, UserProfile, get_user_profile_by_id
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from zproject.email_backends import EmailLogBackEnd, get_forward_address
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MAX_CONNECTION_TRIES = 3
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## Logging setup ##
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logger = logging.getLogger("zulip.send_email")
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log_to_file(logger, settings.EMAIL_LOG_PATH)
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def get_inliner_instance() -> css_inline.CSSInliner:
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return css_inline.CSSInliner()
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class FromAddress:
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SUPPORT = parseaddr(settings.ZULIP_ADMINISTRATOR)[1]
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NOREPLY = parseaddr(settings.NOREPLY_EMAIL_ADDRESS)[1]
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support_placeholder = "SUPPORT"
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no_reply_placeholder = "NO_REPLY"
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tokenized_no_reply_placeholder = "TOKENIZED_NO_REPLY"
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# Generates an unpredictable noreply address.
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@staticmethod
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def tokenized_no_reply_address() -> str:
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if settings.ADD_TOKENS_TO_NOREPLY_ADDRESS:
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return parseaddr(settings.TOKENIZED_NOREPLY_EMAIL_ADDRESS)[1].format(
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token=generate_key()
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)
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return FromAddress.NOREPLY
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@staticmethod
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def security_email_from_name(
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language: Optional[str] = None, user_profile: Optional[UserProfile] = None
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) -> str:
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if language is None:
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assert user_profile is not None
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language = user_profile.default_language
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with override_language(language):
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return _("Zulip Account Security")
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def build_email(
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template_prefix: str,
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to_user_ids: Optional[List[int]] = None,
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to_emails: Optional[List[str]] = None,
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from_name: Optional[str] = None,
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from_address: Optional[str] = None,
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reply_to_email: Optional[str] = None,
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language: Optional[str] = None,
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context: Mapping[str, Any] = {},
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realm: Optional[Realm] = None,
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) -> EmailMultiAlternatives:
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# Callers should pass exactly one of to_user_id and to_email.
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assert (to_user_ids is None) ^ (to_emails is None)
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if to_user_ids is not None:
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to_users = [get_user_profile_by_id(to_user_id) for to_user_id in to_user_ids]
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if realm is None:
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assert len({to_user.realm_id for to_user in to_users}) == 1
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realm = to_users[0].realm
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to_emails = []
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for to_user in to_users:
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stringified = str(
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Address(display_name=to_user.full_name, addr_spec=to_user.delivery_email)
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)
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# Check ASCII encoding length. Amazon SES rejects emails
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# with From or To values longer than 320 characters (which
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# appears to be a misinterpretation of the RFC); in that
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# case we drop the name part from the address, under the
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# theory that it's better to send the email with a
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# simplified field than not at all.
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if len(sanitize_address(stringified, "utf-8")) > 320:
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stringified = str(Address(addr_spec=to_user.delivery_email))
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to_emails.append(stringified)
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# Attempt to suppress all auto-replies. This header originally
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# came out of Microsoft Outlook and friends, but seems reasonably
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# commonly-recognized.
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extra_headers = {"X-Auto-Response-Suppress": "All"}
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if realm is not None:
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# formaddr is meant for formatting (display_name, email_address) pair for headers like "To",
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# but we can use its utility for formatting the List-Id header, as it follows the same format,
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# except having just a domain instead of an email address.
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extra_headers["List-Id"] = formataddr((realm.name, realm.host))
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assert settings.STATIC_URL is not None
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context = {
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**context,
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"support_email": FromAddress.SUPPORT,
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# Emails use unhashed image URLs so that those continue to
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# work over time, even if the prod-static directory is cleaned
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# out; as such, they just use a STATIC_URL prefix.
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"email_images_base_url": settings.STATIC_URL + "images/emails",
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"physical_address": settings.PHYSICAL_ADDRESS,
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}
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def get_inlined_template(template: str) -> str:
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inliner = get_inliner_instance()
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return inliner.inline(template)
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def render_templates() -> Tuple[str, str, str]:
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email_subject = (
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loader.render_to_string(
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template_prefix + ".subject.txt", context=context, using="Jinja2_plaintext"
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)
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.strip()
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.replace("\n", "")
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)
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message = loader.render_to_string(
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template_prefix + ".txt", context=context, using="Jinja2_plaintext"
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)
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html_message = loader.render_to_string(template_prefix + ".html", context)
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return (get_inlined_template(html_message), message, email_subject)
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# The i18n story for emails is a bit complicated. For emails
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# going to a single user, we want to use the language that user
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# has configured for their Zulip account. For emails going to
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# multiple users or to email addresses without a known Zulip
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# account (E.g. invitations), we want to use the default language
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# configured for the Zulip organization.
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#
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# See our i18n documentation for some high-level details:
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# https://zulip.readthedocs.io/en/latest/translating/internationalization.html
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if not language and to_user_ids is not None:
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language = to_users[0].default_language
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if language:
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with override_language(language):
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# Make sure that we render the email using the target's native language
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(html_message, message, email_subject) = render_templates()
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else:
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(html_message, message, email_subject) = render_templates()
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logger.warning("Missing language for email template '%s'", template_prefix)
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if from_name is None:
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from_name = "Zulip"
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if from_address is None:
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from_address = FromAddress.NOREPLY
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if from_address == FromAddress.tokenized_no_reply_placeholder:
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from_address = FromAddress.tokenized_no_reply_address()
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if from_address == FromAddress.no_reply_placeholder:
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from_address = FromAddress.NOREPLY
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if from_address == FromAddress.support_placeholder:
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from_address = FromAddress.SUPPORT
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# Set the "From" that is displayed separately from the envelope-from.
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extra_headers["From"] = str(Address(display_name=from_name, addr_spec=from_address))
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# As above, with the "To" line, we drop the name part if it would
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# result in an address which is longer than 320 bytes.
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if len(sanitize_address(extra_headers["From"], "utf-8")) > 320:
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extra_headers["From"] = str(Address(addr_spec=from_address))
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# If we have an unsubscribe link for this email, configure it for
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# "Unsubscribe" buttons in email clients via the List-Unsubscribe header.
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#
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# Note that Microsoft ignores URLs in List-Unsubscribe headers, as
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# they only support the alternative `mailto:` format, which we
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# have not implemented.
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if "unsubscribe_link" in context:
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extra_headers["List-Unsubscribe"] = f"<{context['unsubscribe_link']}>"
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extra_headers["List-Unsubscribe-Post"] = "List-Unsubscribe=One-Click"
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reply_to = None
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if reply_to_email is not None:
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reply_to = [reply_to_email]
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# Remove the from_name in the reply-to for noreply emails, so that users
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# see "noreply@..." rather than "Zulip" or whatever the from_name is
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# when they reply in their email client.
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elif from_address == FromAddress.NOREPLY:
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reply_to = [FromAddress.NOREPLY]
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envelope_from = FromAddress.NOREPLY
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mail = EmailMultiAlternatives(
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email_subject, message, envelope_from, to_emails, reply_to=reply_to, headers=extra_headers
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)
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if html_message is not None:
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mail.attach_alternative(html_message, "text/html")
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return mail
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class EmailNotDeliveredError(Exception):
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pass
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class DoubledEmailArgumentError(CommandError):
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def __init__(self, argument_name: str) -> None:
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msg = (
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f"Argument '{argument_name}' is ambiguously present in both options and email template."
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)
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super().__init__(msg)
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class NoEmailArgumentError(CommandError):
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def __init__(self, argument_name: str) -> None:
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msg = f"Argument '{argument_name}' is required in either options or email template."
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super().__init__(msg)
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# When changing the arguments to this function, you may need to write a
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# migration to change or remove any emails in ScheduledEmail.
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def send_email(
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template_prefix: str,
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to_user_ids: Optional[List[int]] = None,
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to_emails: Optional[List[str]] = None,
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from_name: Optional[str] = None,
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from_address: Optional[str] = None,
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reply_to_email: Optional[str] = None,
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language: Optional[str] = None,
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context: Mapping[str, Any] = {},
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realm: Optional[Realm] = None,
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connection: Optional[BaseEmailBackend] = None,
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dry_run: bool = False,
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request: Optional[HttpRequest] = None,
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) -> None:
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mail = build_email(
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template_prefix,
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to_user_ids=to_user_ids,
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to_emails=to_emails,
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from_name=from_name,
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from_address=from_address,
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reply_to_email=reply_to_email,
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language=language,
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context=context,
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realm=realm,
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)
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template = template_prefix.split("/")[-1]
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log_email_config_errors()
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if dry_run:
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print(mail.message().get_payload()[0])
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return
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if connection is None:
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connection = get_connection()
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cause = ""
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if request is not None:
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cause = f" (triggered from {request.META['REMOTE_ADDR']})"
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logging_recipient: Union[str, List[str]] = mail.to
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if realm is not None:
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logging_recipient = f"{mail.to} in {realm.string_id}"
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logger.info("Sending %s email to %s%s", template, logging_recipient, cause)
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try:
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# This will call .open() for us, which is a no-op if it's already open;
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# it will only call .close() if it was not open to begin with
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if connection.send_messages([mail]) == 0:
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logger.error("Unknown error sending %s email to %s", template, mail.to)
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raise EmailNotDeliveredError
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except smtplib.SMTPResponseException as e:
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logger.exception(
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"Error sending %s email to %s with error code %s: %s",
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template,
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mail.to,
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e.smtp_code,
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e.smtp_error,
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stack_info=True,
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)
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raise EmailNotDeliveredError
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except smtplib.SMTPException as e:
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logger.exception("Error sending %s email to %s: %s", template, mail.to, e, stack_info=True)
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raise EmailNotDeliveredError
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@backoff.on_exception(backoff.expo, OSError, max_tries=MAX_CONNECTION_TRIES, logger=None)
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def initialize_connection(connection: Optional[BaseEmailBackend] = None) -> BaseEmailBackend:
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if not connection:
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connection = get_connection()
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assert connection is not None
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if connection.open():
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# If it's a new connection, no need to no-op to check connectivity
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return connection
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if isinstance(connection, EmailLogBackEnd) and not get_forward_address():
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# With the development environment backend and without a
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# configured forwarding address, we don't actually send emails.
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#
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# As a result, the connection cannot be closed by the server
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# (as there is none), and `connection.noop` is not
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# implemented, so we need to return the connection early.
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return connection
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# No-op to ensure that we don't return a connection that has been
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# closed by the mail server.
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if isinstance(connection, EmailBackend):
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try:
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assert connection.connection is not None
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status = connection.connection.noop()[0]
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except Exception:
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status = -1
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if status != 250:
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# Close and connect again.
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connection.close()
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connection.open()
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return connection
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def send_future_email(
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template_prefix: str,
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realm: Realm,
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to_user_ids: Optional[List[int]] = None,
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to_emails: Optional[List[str]] = None,
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from_name: Optional[str] = None,
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from_address: Optional[str] = None,
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language: Optional[str] = None,
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context: Mapping[str, Any] = {},
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delay: datetime.timedelta = datetime.timedelta(0),
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) -> None:
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template_name = template_prefix.split("/")[-1]
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email_fields = {
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"template_prefix": template_prefix,
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"from_name": from_name,
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"from_address": from_address,
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"language": language,
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"context": context,
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}
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if settings.DEVELOPMENT_LOG_EMAILS:
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send_email(
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template_prefix,
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to_user_ids=to_user_ids,
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to_emails=to_emails,
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from_name=from_name,
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from_address=from_address,
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language=language,
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context=context,
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)
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# For logging the email
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assert (to_user_ids is None) ^ (to_emails is None)
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with transaction.atomic():
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email = ScheduledEmail.objects.create(
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type=EMAIL_TYPES[template_name],
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scheduled_timestamp=timezone_now() + delay,
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realm=realm,
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data=orjson.dumps(email_fields).decode(),
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)
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# We store the recipients in the ScheduledEmail object itself,
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# rather than the JSON data object, so that we can find and clear
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# them using clear_scheduled_emails.
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try:
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if to_user_ids is not None:
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email.users.add(*to_user_ids)
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else:
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assert to_emails is not None
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assert len(to_emails) == 1
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email.address = parseaddr(to_emails[0])[1]
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email.save()
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except Exception as e:
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email.delete()
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raise e
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def send_email_to_admins(
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template_prefix: str,
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realm: Realm,
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from_name: Optional[str] = None,
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from_address: Optional[str] = None,
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language: Optional[str] = None,
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context: Mapping[str, Any] = {},
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) -> None:
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admins = realm.get_human_admin_users()
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admin_user_ids = [admin.id for admin in admins]
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send_email(
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template_prefix,
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to_user_ids=admin_user_ids,
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from_name=from_name,
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from_address=from_address,
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language=language,
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context=context,
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)
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def send_email_to_billing_admins_and_realm_owners(
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template_prefix: str,
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realm: Realm,
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from_name: Optional[str] = None,
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from_address: Optional[str] = None,
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language: Optional[str] = None,
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context: Mapping[str, Any] = {},
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) -> None:
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send_email(
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template_prefix,
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to_user_ids=[user.id for user in realm.get_human_billing_admin_and_realm_owner_users()],
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from_name=from_name,
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from_address=from_address,
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language=language,
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context=context,
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)
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def clear_scheduled_invitation_emails(email: str) -> None:
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"""Unlike most scheduled emails, invitation emails don't have an
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existing user object to key off of, so we filter by address here."""
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items = ScheduledEmail.objects.filter(
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address__iexact=email, type=ScheduledEmail.INVITATION_REMINDER
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)
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items.delete()
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|
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@transaction.atomic(savepoint=False)
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def clear_scheduled_emails(user_id: int, email_type: Optional[int] = None) -> None:
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# We need to obtain a FOR UPDATE lock on the selected rows to keep a concurrent
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# execution of this function (or something else) from deleting them before we access
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# the .users attribute.
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items = (
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ScheduledEmail.objects.filter(users__in=[user_id])
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.prefetch_related("users")
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.select_for_update()
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)
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if email_type is not None:
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items = items.filter(type=email_type)
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for item in items:
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item.users.remove(user_id)
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if not item.users.all().exists():
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# Due to our transaction holding the row lock we have a guarantee
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# that the obtained COUNT is accurate, thus we can reliably use it
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# to decide whether to delete the ScheduledEmail row.
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item.delete()
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def handle_send_email_format_changes(job: Dict[str, Any]) -> None:
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# Reformat any jobs that used the old to_email
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# and to_user_ids argument formats.
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if "to_email" in job:
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if job["to_email"] is not None:
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job["to_emails"] = [job["to_email"]]
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del job["to_email"]
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if "to_user_id" in job:
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if job["to_user_id"] is not None:
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job["to_user_ids"] = [job["to_user_id"]]
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del job["to_user_id"]
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|
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def deliver_scheduled_emails(email: ScheduledEmail) -> None:
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data = orjson.loads(email.data)
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user_ids = list(email.users.values_list("id", flat=True))
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if not user_ids and not email.address:
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# This state doesn't make sense, so something must have mutated the object
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logger.warning(
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"ScheduledEmail %s at %s had empty users and address attributes: %r",
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email.id,
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email.scheduled_timestamp,
|
|
data,
|
|
)
|
|
email.delete()
|
|
return
|
|
|
|
if user_ids:
|
|
data["to_user_ids"] = user_ids
|
|
if email.address is not None:
|
|
data["to_emails"] = [email.address]
|
|
handle_send_email_format_changes(data)
|
|
send_email(**data)
|
|
email.delete()
|
|
|
|
|
|
def get_header(option: Optional[str], header: Optional[str], name: str) -> str:
|
|
if option and header:
|
|
raise DoubledEmailArgumentError(name)
|
|
if not option and not header:
|
|
raise NoEmailArgumentError(name)
|
|
return str(option or header)
|
|
|
|
|
|
def send_custom_email(
|
|
users: QuerySet[UserProfile],
|
|
*,
|
|
target_emails: Sequence[str] = [],
|
|
options: Dict[str, Any],
|
|
add_context: Optional[Callable[[Dict[str, object], UserProfile], None]] = None,
|
|
) -> None:
|
|
"""
|
|
Helper for `manage.py send_custom_email`.
|
|
|
|
Can be used directly with from a management shell with
|
|
send_custom_email(user_profile_list, dict(
|
|
markdown_template_path="/path/to/markdown/file.md",
|
|
subject="Email subject",
|
|
from_name="Sender Name")
|
|
)
|
|
"""
|
|
|
|
with open(options["markdown_template_path"]) as f:
|
|
text = f.read()
|
|
parsed_email_template = Parser(policy=default).parsestr(text)
|
|
email_template_hash = hashlib.sha256(text.encode()).hexdigest()[0:32]
|
|
|
|
email_id = f"zerver/emails/custom/custom_email_{email_template_hash}"
|
|
markdown_email_base_template_path = "templates/zerver/emails/custom_email_base.pre.html"
|
|
html_template_path = f"templates/{email_id}.html"
|
|
plain_text_template_path = f"templates/{email_id}.txt"
|
|
subject_path = f"templates/{email_id}.subject.txt"
|
|
os.makedirs(os.path.dirname(html_template_path), exist_ok=True)
|
|
|
|
# First, we render the Markdown input file just like our
|
|
# user-facing docs with render_markdown_path.
|
|
with open(plain_text_template_path, "w") as f:
|
|
f.write(parsed_email_template.get_payload())
|
|
|
|
from zerver.lib.templates import render_markdown_path
|
|
|
|
rendered_input = render_markdown_path(plain_text_template_path.replace("templates/", ""))
|
|
|
|
# And then extend it with our standard email headers.
|
|
with open(html_template_path, "w") as f:
|
|
with open(markdown_email_base_template_path) as base_template:
|
|
# We use an ugly string substitution here, because we want to:
|
|
# 1. Only run Jinja once on the supplied content
|
|
# 2. Allow the supplied content to have jinja interpolation in it
|
|
# 3. Have that interpolation happen in the context of
|
|
# each individual email we send, so the contents can
|
|
# vary user-to-user
|
|
f.write(base_template.read().replace("{{ rendered_input }}", rendered_input))
|
|
|
|
with open(subject_path, "w") as f:
|
|
f.write(get_header(options.get("subject"), parsed_email_template.get("subject"), "subject"))
|
|
|
|
# Finally, we send the actual emails.
|
|
for user_profile in users.select_related("realm").order_by("id"):
|
|
if options.get("admins_only") and not user_profile.is_realm_admin:
|
|
continue
|
|
context: Dict[str, object] = {
|
|
"realm": user_profile.realm,
|
|
"realm_string_id": user_profile.realm.string_id,
|
|
"realm_uri": user_profile.realm.uri,
|
|
"realm_name": user_profile.realm.name,
|
|
}
|
|
if add_context is not None:
|
|
add_context(context, user_profile)
|
|
with suppress(EmailNotDeliveredError):
|
|
send_email(
|
|
email_id,
|
|
to_user_ids=[user_profile.id],
|
|
from_address=FromAddress.SUPPORT,
|
|
reply_to_email=options.get("reply_to"),
|
|
from_name=get_header(
|
|
options.get("from_name"), parsed_email_template.get("from"), "from_name"
|
|
),
|
|
context=context,
|
|
dry_run=options["dry_run"],
|
|
)
|
|
|
|
if options["dry_run"]:
|
|
break
|
|
|
|
# Now send emails to any recipients without a user account.
|
|
# This code path is intended for rare RemoteZulipServer emails.
|
|
for email_address in target_emails:
|
|
send_email(
|
|
email_id,
|
|
to_emails=[email_address],
|
|
from_address=FromAddress.SUPPORT,
|
|
reply_to_email=options.get("reply_to"),
|
|
from_name=get_header(
|
|
options.get("from_name"), parsed_email_template.get("from"), "from_name"
|
|
),
|
|
context={"remote_server_email": True},
|
|
dry_run=options["dry_run"],
|
|
)
|
|
|
|
if options["dry_run"]:
|
|
break
|
|
|
|
|
|
def log_email_config_errors() -> None:
|
|
"""
|
|
The purpose of this function is to log (potential) config errors,
|
|
but without raising an exception.
|
|
"""
|
|
if settings.EMAIL_HOST_USER and settings.EMAIL_HOST_PASSWORD is None:
|
|
logger.error(
|
|
"An SMTP username was set (EMAIL_HOST_USER), but password is unset (EMAIL_HOST_PASSWORD). "
|
|
"To disable SMTP authentication, set EMAIL_HOST_USER to an empty string."
|
|
)
|