mirror of https://github.com/zulip/zulip.git
465 lines
17 KiB
Python
465 lines
17 KiB
Python
import logging
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from datetime import datetime, timedelta
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from typing import Any, Collection, Dict, List, Optional, Sequence, Set, Tuple
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from django.conf import settings
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from django.contrib.contenttypes.models import ContentType
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from django.db import transaction
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from django.db.models import Q, QuerySet, Sum
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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 zxcvbn import zxcvbn
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from analytics.lib.counts import COUNT_STATS, do_increment_logging_stat
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from analytics.models import RealmCount
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from confirmation import settings as confirmation_settings
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from confirmation.models import (
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Confirmation,
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confirmation_url_for,
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create_confirmation_link,
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create_confirmation_object,
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)
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from zerver.context_processors import common_context
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from zerver.lib.email_validation import (
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get_existing_user_errors,
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get_realm_email_validator,
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validate_email_is_valid,
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)
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from zerver.lib.exceptions import InvitationError
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from zerver.lib.invites import notify_invites_changed
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from zerver.lib.queue import queue_event_on_commit
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from zerver.lib.send_email import FromAddress, clear_scheduled_invitation_emails, send_future_email
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from zerver.lib.timestamp import datetime_to_timestamp
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from zerver.lib.utils import assert_is_not_none
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from zerver.models import Message, MultiuseInvite, PreregistrationUser, Realm, Stream, UserProfile
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from zerver.models.prereg_users import filter_to_valid_prereg_users
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def estimate_recent_invites(realms: Collection[Realm] | QuerySet[Realm], *, days: int) -> int:
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"""An upper bound on the number of invites sent in the last `days` days"""
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recent_invites = RealmCount.objects.filter(
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realm__in=realms,
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property="invites_sent::day",
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end_time__gte=timezone_now() - timedelta(days=days),
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).aggregate(Sum("value"))["value__sum"]
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if recent_invites is None:
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return 0
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return recent_invites
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def too_many_recent_realm_invites(realm: Realm, num_invitees: int) -> bool:
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# Basic check that we're blow the realm-set limit
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recent_invites = estimate_recent_invites([realm], days=1)
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if num_invitees + recent_invites > realm.max_invites:
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return True
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if realm.plan_type != Realm.PLAN_TYPE_LIMITED:
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return False
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if realm.max_invites != settings.INVITES_DEFAULT_REALM_DAILY_MAX:
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return False
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# If they're a non-paid plan with default invitation limits,
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# we further limit how many invitations can be sent in a day
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# as a function of how many current users they have. The
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# allowed ratio has some heuristics to lock down likely-spammy
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# realms. This ratio likely only matters for the first
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# handful of invites; if those users accept, then the realm is
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# unlikely to hit these limits. If a real realm hits them,
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# the resulting message suggests that they contact support if
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# they have a real use case.
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warning_flags = []
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if zxcvbn(realm.string_id)["score"] == 4:
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# Very high entropy realm names are suspicious
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warning_flags.append("random-realm-name")
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if not realm.description:
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warning_flags.append("no-realm-description")
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if realm.icon_source == Realm.ICON_FROM_GRAVATAR:
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warning_flags.append("no-realm-icon")
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if realm.date_created >= timezone_now() - timedelta(hours=1):
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warning_flags.append("realm-created-in-last-hour")
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current_user_count = UserProfile.objects.filter(
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realm=realm, is_bot=False, is_active=True
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).count()
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if current_user_count == 1:
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warning_flags.append("only-one-user")
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estimated_sent = RealmCount.objects.filter(
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realm=realm, property="messages_sent:message_type:day"
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).aggregate(messages=Sum("value"))
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if (
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not estimated_sent["messages"]
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# Only after we've done the rough-estimate check, take the
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# time to do the exact check:
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and not Message.objects.filter(
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# Uses index: zerver_message_realm_sender_recipient (prefix)
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realm=realm,
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sender__is_bot=False,
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).exists()
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):
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warning_flags.append("no-messages-sent")
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if len(warning_flags) == 6:
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permitted_ratio = 2
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elif len(warning_flags) >= 3:
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permitted_ratio = 3
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else:
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permitted_ratio = 5
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ratio = (num_invitees + recent_invites) / current_user_count
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logging.log(
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logging.WARNING if ratio > permitted_ratio else logging.INFO,
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"%s (!: %s) inviting %d more, have %d recent, but only %d current users. Ratio %.1f, %d allowed",
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realm.string_id,
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",".join(warning_flags),
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num_invitees,
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recent_invites,
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current_user_count,
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ratio,
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permitted_ratio,
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)
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return ratio > permitted_ratio
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def check_invite_limit(realm: Realm, num_invitees: int) -> None:
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"""Discourage using invitation emails as a vector for carrying spam."""
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msg = _(
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"To protect users, Zulip limits the number of invitations you can send in one day. Because you have reached the limit, no invitations were sent."
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)
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if not settings.OPEN_REALM_CREATION:
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return
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if too_many_recent_realm_invites(realm, num_invitees):
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raise InvitationError(
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msg,
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[],
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sent_invitations=False,
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daily_limit_reached=True,
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)
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default_max = settings.INVITES_DEFAULT_REALM_DAILY_MAX
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newrealm_age = timedelta(days=settings.INVITES_NEW_REALM_DAYS)
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if realm.date_created <= timezone_now() - newrealm_age:
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# If this isn't a "newly-created" realm, we're done. The
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# remaining code applies an aggregate limit across all
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# "new" realms, to address sudden bursts of spam realms.
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return
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if realm.max_invites > default_max:
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# If a user is on a realm where we've bumped up
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# max_invites, then we exempt them from invite limits.
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return
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new_realms = Realm.objects.filter(
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date_created__gte=timezone_now() - newrealm_age,
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_max_invites__lte=default_max,
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).all()
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for days, count in settings.INVITES_NEW_REALM_LIMIT_DAYS:
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recent_invites = estimate_recent_invites(new_realms, days=days)
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if num_invitees + recent_invites > count:
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raise InvitationError(
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msg,
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[],
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sent_invitations=False,
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daily_limit_reached=True,
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)
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@transaction.atomic
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def do_invite_users(
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user_profile: UserProfile,
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invitee_emails: Collection[str],
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streams: Collection[Stream],
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*,
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invite_expires_in_minutes: Optional[int],
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invite_as: int = PreregistrationUser.INVITE_AS["MEMBER"],
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) -> List[Tuple[str, str, bool]]:
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num_invites = len(invitee_emails)
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# Lock the realm, since we need to not race with other invitations
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realm = Realm.objects.select_for_update().get(id=user_profile.realm_id)
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check_invite_limit(realm, num_invites)
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if settings.BILLING_ENABLED:
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from corporate.lib.registration import check_spare_licenses_available_for_inviting_new_users
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if invite_as == PreregistrationUser.INVITE_AS["GUEST_USER"]:
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check_spare_licenses_available_for_inviting_new_users(
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realm, extra_guests_count=num_invites
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)
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else:
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check_spare_licenses_available_for_inviting_new_users(
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realm, extra_non_guests_count=num_invites
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)
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if not realm.invite_required:
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# Inhibit joining an open realm to send spam invitations.
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min_age = timedelta(days=settings.INVITES_MIN_USER_AGE_DAYS)
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if user_profile.date_joined > timezone_now() - min_age and not user_profile.is_realm_admin:
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raise InvitationError(
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_(
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"Your account is too new to send invites for this organization. "
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"Ask an organization admin, or a more experienced user."
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),
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[],
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sent_invitations=False,
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)
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good_emails: Set[str] = set()
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errors: List[Tuple[str, str, bool]] = []
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validate_email_allowed_in_realm = get_realm_email_validator(realm)
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for email in invitee_emails:
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if email == "":
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continue
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email_error = validate_email_is_valid(
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email,
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validate_email_allowed_in_realm,
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)
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if email_error:
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errors.append((email, email_error, False))
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else:
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good_emails.add(email)
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"""
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good_emails are emails that look ok so far,
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but we still need to make sure they're not
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gonna conflict with existing users
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"""
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error_dict = get_existing_user_errors(realm, good_emails)
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skipped: List[Tuple[str, str, bool]] = []
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for email in error_dict:
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msg, deactivated = error_dict[email]
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skipped.append((email, msg, deactivated))
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good_emails.remove(email)
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validated_emails = list(good_emails)
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if errors:
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raise InvitationError(
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_("Some emails did not validate, so we didn't send any invitations."),
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errors + skipped,
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sent_invitations=False,
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)
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if skipped and len(skipped) == len(invitee_emails):
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# All e-mails were skipped, so we didn't actually invite anyone.
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raise InvitationError(
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_("We weren't able to invite anyone."), skipped, sent_invitations=False
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)
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# Now that we are past all the possible errors, we actually create
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# the PreregistrationUser objects and trigger the email invitations.
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for email in validated_emails:
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# The logged in user is the referrer.
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prereg_user = PreregistrationUser(
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email=email, referred_by=user_profile, invited_as=invite_as, realm=realm
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)
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prereg_user.save()
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stream_ids = [stream.id for stream in streams]
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prereg_user.streams.set(stream_ids)
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confirmation = create_confirmation_object(
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prereg_user, Confirmation.INVITATION, validity_in_minutes=invite_expires_in_minutes
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)
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do_send_user_invite_email(
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prereg_user,
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confirmation=confirmation,
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invite_expires_in_minutes=invite_expires_in_minutes,
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)
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notify_invites_changed(realm, changed_invite_referrer=user_profile)
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return skipped
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def get_invitation_expiry_date(confirmation_obj: Confirmation) -> Optional[int]:
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expiry_date = confirmation_obj.expiry_date
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if expiry_date is None:
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return expiry_date
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return datetime_to_timestamp(expiry_date)
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def do_get_invites_controlled_by_user(user_profile: UserProfile) -> List[Dict[str, Any]]:
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"""
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Returns a list of dicts representing invitations that can be controlled by user_profile.
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This isn't necessarily the same as all the invitations generated by the user, as administrators
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can control also invitations that they did not themselves create.
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"""
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if user_profile.is_realm_admin:
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prereg_users = filter_to_valid_prereg_users(
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PreregistrationUser.objects.filter(referred_by__realm=user_profile.realm)
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)
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else:
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prereg_users = filter_to_valid_prereg_users(
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PreregistrationUser.objects.filter(referred_by=user_profile)
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)
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invites = []
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for invitee in prereg_users:
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assert invitee.referred_by is not None
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invites.append(
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dict(
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email=invitee.email,
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invited_by_user_id=invitee.referred_by.id,
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invited=datetime_to_timestamp(invitee.invited_at),
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expiry_date=get_invitation_expiry_date(invitee.confirmation.get()),
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id=invitee.id,
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invited_as=invitee.invited_as,
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is_multiuse=False,
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)
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)
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if user_profile.is_realm_admin:
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multiuse_confirmation_objs = Confirmation.objects.filter(
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realm=user_profile.realm, type=Confirmation.MULTIUSE_INVITE
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).filter(Q(expiry_date__gte=timezone_now()) | Q(expiry_date=None))
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else:
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multiuse_invite_ids = MultiuseInvite.objects.filter(referred_by=user_profile).values_list(
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"id", flat=True
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)
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multiuse_confirmation_objs = Confirmation.objects.filter(
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type=Confirmation.MULTIUSE_INVITE,
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object_id__in=multiuse_invite_ids,
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).filter(Q(expiry_date__gte=timezone_now()) | Q(expiry_date=None))
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for confirmation_obj in multiuse_confirmation_objs:
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invite = confirmation_obj.content_object
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assert invite is not None
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# This should be impossible, because revoking a multiuse invite
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# deletes the Confirmation object, so it couldn't have been fetched above.
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assert invite.status != confirmation_settings.STATUS_REVOKED
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invites.append(
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dict(
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invited_by_user_id=invite.referred_by.id,
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invited=datetime_to_timestamp(confirmation_obj.date_sent),
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expiry_date=get_invitation_expiry_date(confirmation_obj),
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id=invite.id,
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link_url=confirmation_url_for(confirmation_obj),
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invited_as=invite.invited_as,
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is_multiuse=True,
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)
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)
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return invites
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@transaction.atomic
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def do_create_multiuse_invite_link(
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referred_by: UserProfile,
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invited_as: int,
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invite_expires_in_minutes: Optional[int],
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streams: Sequence[Stream] = [],
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) -> str:
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realm = referred_by.realm
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invite = MultiuseInvite.objects.create(realm=realm, referred_by=referred_by)
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if streams:
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invite.streams.set(streams)
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invite.invited_as = invited_as
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invite.save()
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notify_invites_changed(referred_by.realm, changed_invite_referrer=referred_by)
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return create_confirmation_link(
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invite, Confirmation.MULTIUSE_INVITE, validity_in_minutes=invite_expires_in_minutes
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)
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@transaction.atomic
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def do_revoke_user_invite(prereg_user: PreregistrationUser) -> None:
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email = prereg_user.email
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realm = prereg_user.realm
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assert realm is not None
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# Delete both the confirmation objects and the prereg_user object.
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# TODO: Probably we actually want to set the confirmation objects
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# to a "revoked" status so that we can give the invited user a better
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# error message.
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content_type = ContentType.objects.get_for_model(PreregistrationUser)
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Confirmation.objects.filter(content_type=content_type, object_id=prereg_user.id).delete()
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prereg_user.delete()
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clear_scheduled_invitation_emails(email)
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notify_invites_changed(realm, changed_invite_referrer=prereg_user.referred_by)
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@transaction.atomic
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def do_revoke_multi_use_invite(multiuse_invite: MultiuseInvite) -> None:
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realm = multiuse_invite.referred_by.realm
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content_type = ContentType.objects.get_for_model(MultiuseInvite)
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Confirmation.objects.filter(content_type=content_type, object_id=multiuse_invite.id).delete()
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multiuse_invite.status = confirmation_settings.STATUS_REVOKED
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multiuse_invite.save(update_fields=["status"])
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notify_invites_changed(realm, changed_invite_referrer=multiuse_invite.referred_by)
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@transaction.atomic
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def do_send_user_invite_email(
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prereg_user: PreregistrationUser,
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*,
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confirmation: Optional[Confirmation] = None,
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event_time: Optional[datetime] = None,
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invite_expires_in_minutes: Optional[int] = None,
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) -> None:
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# Take a lock on the realm, so we can check for invitation limits without races
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realm_id = assert_is_not_none(prereg_user.realm_id)
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realm = Realm.objects.select_for_update().get(id=realm_id)
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check_invite_limit(realm, 1)
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referrer = assert_is_not_none(prereg_user.referred_by)
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if event_time is None:
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event_time = prereg_user.invited_at
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do_increment_logging_stat(realm, COUNT_STATS["invites_sent::day"], None, event_time)
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if confirmation is None:
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confirmation = prereg_user.confirmation.get()
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event = {
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"template_prefix": "zerver/emails/invitation",
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"to_emails": [prereg_user.email],
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"from_address": FromAddress.tokenized_no_reply_address(),
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"language": realm.default_language,
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"context": {
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"referrer_full_name": referrer.full_name,
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"referrer_email": referrer.delivery_email,
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"activate_url": confirmation_url_for(confirmation),
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"referrer_realm_name": realm.name,
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"corporate_enabled": settings.CORPORATE_ENABLED,
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},
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"realm_id": realm.id,
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}
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queue_event_on_commit("email_senders", event)
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clear_scheduled_invitation_emails(prereg_user.email)
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if invite_expires_in_minutes is None and confirmation.expiry_date is not None:
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# Pull the remaining time from the confirmation object
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invite_expires_in_minutes = (confirmation.expiry_date - event_time).total_seconds() / 60
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if invite_expires_in_minutes is None or invite_expires_in_minutes < 4 * 24 * 60:
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# We do not queue reminder email for never expiring
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# invitations. This is probably a low importance bug; it
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# would likely be more natural to send a reminder after 7
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# days.
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return
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context = common_context(referrer)
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context.update(
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activate_url=confirmation_url_for(confirmation),
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referrer_name=referrer.full_name,
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referrer_email=referrer.delivery_email,
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referrer_realm_name=realm.name,
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)
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send_future_email(
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"zerver/emails/invitation_reminder",
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realm,
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to_emails=[prereg_user.email],
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from_address=FromAddress.tokenized_no_reply_placeholder,
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language=realm.default_language,
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context=context,
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delay=timedelta(minutes=invite_expires_in_minutes - (2 * 24 * 60)),
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)
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