zulip/zerver/actions/create_user.py

import datetime
from collections import defaultdict
from typing import Any, Dict, Iterable, List, Optional, Sequence, Set

import orjson
from django.conf import settings
from django.db import transaction
from django.utils.timezone import now as timezone_now
from django.utils.translation import gettext as _
from django.utils.translation import override as override_language

from analytics.lib.counts import COUNT_STATS, do_increment_logging_stat
from confirmation import settings as confirmation_settings
from zerver.actions.invites import notify_invites_changed
from zerver.actions.message_send import internal_send_private_message, internal_send_stream_message
from zerver.actions.streams import bulk_add_subscriptions, send_peer_subscriber_events
from zerver.actions.user_groups import do_send_user_group_members_update_event
from zerver.actions.users import change_user_is_active, get_service_dicts_for_bot
from zerver.lib.avatar import avatar_url
from zerver.lib.create_user import create_user
from zerver.lib.default_streams import get_slim_realm_default_streams
from zerver.lib.email_notifications import enqueue_welcome_emails, send_account_registered_email
from zerver.lib.mention import silent_mention_syntax_for_user
from zerver.lib.send_email import clear_scheduled_invitation_emails
from zerver.lib.stream_subscription import bulk_get_subscriber_peer_info
from zerver.lib.user_counts import realm_user_count, realm_user_count_by_role
from zerver.lib.user_groups import get_system_user_group_for_user
from zerver.lib.users import (
    can_access_delivery_email,
    format_user_row,
    get_api_key,
    user_profile_to_user_row,
)
from zerver.models import (
    DefaultStreamGroup,
    Message,
    PreregistrationRealm,
    PreregistrationUser,
    Realm,
    RealmAuditLog,
    Recipient,
    Stream,
    Subscription,
    UserGroup,
    UserGroupMembership,
    UserMessage,
    UserProfile,
    bot_owner_user_ids,
    get_system_bot,
)
from zerver.tornado.django_api import send_event_on_commit

if settings.BILLING_ENABLED:
    from corporate.lib.stripe import update_license_ledger_if_needed


MAX_NUM_ONBOARDING_MESSAGES = 1000
MAX_NUM_ONBOARDING_UNREAD_MESSAGES = 20

# We don't want to mark years-old messages as unread, since that might
# feel like Zulip is buggy, but in low-traffic or bursty-traffic
# organizations, it's reasonable for the most recent 20 messages to be
# several weeks old and still be a good place to start.
ONBOARDING_RECENT_TIMEDELTA = datetime.timedelta(weeks=12)

DEFAULT_HISTORICAL_FLAGS = UserMessage.flags.historical | UserMessage.flags.read


def create_historical_user_messages(
    *, user_id: int, message_ids: Iterable[int], flags: int = DEFAULT_HISTORICAL_FLAGS
) -> None:
    # Users can see and interact with messages sent to streams with
    # public history for which they do not have a UserMessage because
    # they were not a subscriber at the time the message was sent.
    # In order to add emoji reactions or mutate message flags for
    # those messages, we create UserMessage objects for those messages;
    # these have the special historical flag which keeps track of the
    # fact that the user did not receive the message at the time it was sent.
    UserMessage.objects.bulk_create(
        UserMessage(user_profile_id=user_id, message_id=message_id, flags=flags)
        for message_id in message_ids
    )


def send_message_to_signup_notification_stream(
    sender: UserProfile, realm: Realm, message: str
) -> None:
    signup_notifications_stream = realm.get_signup_notifications_stream()
    if signup_notifications_stream is None:
        return

    with override_language(realm.default_language):
        topic_name = _("signups")

    internal_send_stream_message(sender, signup_notifications_stream, topic_name, message)


def notify_new_user(user_profile: UserProfile) -> None:
    user_count = realm_user_count(user_profile.realm)
    sender_email = settings.NOTIFICATION_BOT
    sender = get_system_bot(sender_email, user_profile.realm_id)

    is_first_user = user_count == 1
    if not is_first_user:
        with override_language(user_profile.realm.default_language):
            message = _("{user} just signed up for Zulip. (total: {user_count})").format(
                user=silent_mention_syntax_for_user(user_profile), user_count=user_count
            )

        if settings.BILLING_ENABLED:
            from corporate.lib.registration import generate_licenses_low_warning_message_if_required

            licenses_low_warning_message = generate_licenses_low_warning_message_if_required(
                user_profile.realm
            )
            if licenses_low_warning_message is not None:
                message += "\n"
                message += licenses_low_warning_message

        send_message_to_signup_notification_stream(sender, user_profile.realm, message)


def set_up_streams_for_new_human_user(
    *,
    user_profile: UserProfile,
    prereg_user: Optional[PreregistrationUser] = None,
    default_stream_groups: Sequence[DefaultStreamGroup] = [],
) -> None:
    realm = user_profile.realm

    if prereg_user is not None:
        streams: List[Stream] = list(prereg_user.streams.all())
        acting_user: Optional[UserProfile] = prereg_user.referred_by

        # A PregistrationUser should not be used for another UserProfile
        assert prereg_user.created_user is None, "PregistrationUser should not be reused"
    else:
        streams = []
        acting_user = None

    user_was_invited = prereg_user is not None and (
        prereg_user.referred_by is not None or prereg_user.multiuse_invite is not None
    )

    # If the Preregistration object didn't explicitly list some streams (it
    # happens when user directly signs up without any invitation), we add the
    # default streams for the realm. Note that we are fine with "slim" Stream
    # objects for calling bulk_add_subscriptions and add_new_user_history,
    # which we verify in StreamSetupTest tests that check query counts.
    if len(streams) == 0 and not user_was_invited:
        streams = get_slim_realm_default_streams(realm.id)

    for default_stream_group in default_stream_groups:
        default_stream_group_streams = default_stream_group.streams.all()
        for stream in default_stream_group_streams:
            if stream not in streams:
                streams.append(stream)

    bulk_add_subscriptions(
        realm,
        streams,
        [user_profile],
        from_user_creation=True,
        acting_user=acting_user,
    )

    add_new_user_history(user_profile, streams)


def add_new_user_history(user_profile: UserProfile, streams: Iterable[Stream]) -> None:
    """
    Give the user some messages in their feed, so that they can learn how to
    use the home view in a realistic way after finishing the tutorial.

    Mark the very most recent messages as unread.
    """

    # Find recipient ids for the user's streams that were passed to us.
    # (Only look at public streams.)
    recipient_ids = [stream.recipient_id for stream in streams if not stream.invite_only]

    # Start by finding recent messages matching those recipients.
    cutoff_date = timezone_now() - ONBOARDING_RECENT_TIMEDELTA
    recent_message_ids = set(
        Message.objects.filter(recipient_id__in=recipient_ids, date_sent__gt=cutoff_date)
        .order_by("-id")
        .values_list("id", flat=True)[0:MAX_NUM_ONBOARDING_MESSAGES]
    )

    if len(recent_message_ids) > 0:
        # Handle the race condition where a message arrives between
        # bulk_add_subscriptions above and the Message query just above
        already_used_ids = set(
            UserMessage.objects.filter(
                message_id__in=recent_message_ids, user_profile=user_profile
            ).values_list("message_id", flat=True)
        )

        # Exclude the already-used ids and sort them.
        backfill_message_ids = sorted(recent_message_ids - already_used_ids)

        # Find which message ids we should mark as read.
        # (We don't want too many unread messages.)
        older_message_ids = set(backfill_message_ids[:-MAX_NUM_ONBOARDING_UNREAD_MESSAGES])

        # Create UserMessage rows for the backfill.
        ums_to_create = []
        for message_id in backfill_message_ids:
            um = UserMessage(user_profile=user_profile, message_id=message_id)
            if message_id in older_message_ids:
                um.flags = UserMessage.flags.read
            ums_to_create.append(um)

        UserMessage.objects.bulk_create(ums_to_create)


# Does the processing for a new user account:
# * Subscribes to default/invitation streams
# * Fills in some recent historical messages
# * Notifies other users in realm and Zulip about the signup
# * Deactivates PreregistrationUser objects
def process_new_human_user(
    user_profile: UserProfile,
    prereg_user: Optional[PreregistrationUser] = None,
    default_stream_groups: Sequence[DefaultStreamGroup] = [],
    realm_creation: bool = False,
) -> None:
    # subscribe to default/invitation streams and
    # fill in some recent historical messages
    set_up_streams_for_new_human_user(
        user_profile=user_profile,
        prereg_user=prereg_user,
        default_stream_groups=default_stream_groups,
    )

    realm = user_profile.realm
    mit_beta_user = realm.is_zephyr_mirror_realm

    # mit_beta_users don't have a referred_by field
    if (
        not mit_beta_user
        and prereg_user is not None
        and prereg_user.referred_by is not None
        and prereg_user.referred_by.is_active
    ):
        # This is a cross-realm direct message.
        with override_language(prereg_user.referred_by.default_language):
            internal_send_private_message(
                get_system_bot(settings.NOTIFICATION_BOT, prereg_user.referred_by.realm_id),
                prereg_user.referred_by,
                _("{user} accepted your invitation to join Zulip!").format(
                    user=f"{user_profile.full_name} <`{user_profile.email}`>"
                ),
            )

    # For the sake of tracking the history of UserProfiles,
    # we want to tie the newly created user to the PreregistrationUser
    # it was created from.
    if prereg_user is not None:
        prereg_user.status = confirmation_settings.STATUS_USED
        prereg_user.created_user = user_profile
        prereg_user.save(update_fields=["status", "created_user"])

    # Mark any other PreregistrationUsers in the realm that are STATUS_USED as
    # inactive so we can keep track of the PreregistrationUser we
    # actually used for analytics.
    if prereg_user is not None:
        PreregistrationUser.objects.filter(
            email__iexact=user_profile.delivery_email, realm=user_profile.realm
        ).exclude(id=prereg_user.id).update(status=confirmation_settings.STATUS_REVOKED)
    else:
        PreregistrationUser.objects.filter(
            email__iexact=user_profile.delivery_email, realm=user_profile.realm
        ).update(status=confirmation_settings.STATUS_REVOKED)

    if prereg_user is not None and prereg_user.referred_by is not None:
        notify_invites_changed(user_profile.realm)

    notify_new_user(user_profile)
    # Clear any scheduled invitation emails to prevent them
    # from being sent after the user is created.
    clear_scheduled_invitation_emails(user_profile.delivery_email)
    if realm.send_welcome_emails:
        enqueue_welcome_emails(user_profile)

    # Schedule an initial email with the user's
    # new account details and log-in information.
    send_account_registered_email(user_profile, realm_creation)

    # We have an import loop here; it's intentional, because we want
    # to keep all the onboarding code in zerver/lib/onboarding.py.
    from zerver.lib.onboarding import send_initial_direct_message

    send_initial_direct_message(user_profile)


def notify_created_user(user_profile: UserProfile) -> None:
    user_row = user_profile_to_user_row(user_profile)

    format_user_row_kwargs: Dict[str, Any] = {
        "realm": user_profile.realm,
        "row": user_row,
        # Since we don't know what the client
        # supports at this point in the code, we
        # just assume client_gravatar and
        # user_avatar_url_field_optional = False :(
        "client_gravatar": False,
        "user_avatar_url_field_optional": False,
        # We assume there's no custom profile
        # field data for a new user; initial
        # values are expected to be added in a
        # later event.
        "custom_profile_field_data": {},
    }

    active_users = user_profile.realm.get_active_users()
    user_ids_with_real_email_access = []
    user_ids_without_real_email_access = []

    person_for_real_email_access_users = None
    person_for_without_real_email_access_users = None
    for recipient_user in active_users:
        if can_access_delivery_email(
            recipient_user, user_profile.id, user_row["email_address_visibility"]
        ):
            user_ids_with_real_email_access.append(recipient_user.id)
            if person_for_real_email_access_users is None:
                # This caller assumes that "format_user_row" only depends on
                # specific value of "acting_user" among users in a realm in
                # email_address_visibility.
                person_for_real_email_access_users = format_user_row(
                    **format_user_row_kwargs,
                    acting_user=recipient_user,
                )
        else:
            user_ids_without_real_email_access.append(recipient_user.id)
            if person_for_without_real_email_access_users is None:
                person_for_without_real_email_access_users = format_user_row(
                    **format_user_row_kwargs,
                    acting_user=recipient_user,
                )

    if user_ids_with_real_email_access:
        assert person_for_real_email_access_users is not None
        event: Dict[str, Any] = dict(
            type="realm_user", op="add", person=person_for_real_email_access_users
        )
        send_event_on_commit(user_profile.realm, event, user_ids_with_real_email_access)

    if user_ids_without_real_email_access:
        assert person_for_without_real_email_access_users is not None
        event = dict(type="realm_user", op="add", person=person_for_without_real_email_access_users)
        send_event_on_commit(user_profile.realm, event, user_ids_without_real_email_access)


def created_bot_event(user_profile: UserProfile) -> Dict[str, Any]:
    def stream_name(stream: Optional[Stream]) -> Optional[str]:
        if not stream:
            return None
        return stream.name

    default_sending_stream_name = stream_name(user_profile.default_sending_stream)
    default_events_register_stream_name = stream_name(user_profile.default_events_register_stream)

    bot = dict(
        email=user_profile.email,
        user_id=user_profile.id,
        full_name=user_profile.full_name,
        bot_type=user_profile.bot_type,
        is_active=user_profile.is_active,
        api_key=get_api_key(user_profile),
        default_sending_stream=default_sending_stream_name,
        default_events_register_stream=default_events_register_stream_name,
        default_all_public_streams=user_profile.default_all_public_streams,
        avatar_url=avatar_url(user_profile),
        services=get_service_dicts_for_bot(user_profile.id),
    )

    # Set the owner key only when the bot has an owner.
    # The default bots don't have an owner. So don't
    # set the owner key while reactivating them.
    if user_profile.bot_owner is not None:
        bot["owner_id"] = user_profile.bot_owner.id

    return dict(type="realm_bot", op="add", bot=bot)


def notify_created_bot(user_profile: UserProfile) -> None:
    event = created_bot_event(user_profile)
    send_event_on_commit(user_profile.realm, event, bot_owner_user_ids(user_profile))


def do_create_user(
    email: str,
    password: Optional[str],
    realm: Realm,
    full_name: str,
    bot_type: Optional[int] = None,
    role: Optional[int] = None,
    bot_owner: Optional[UserProfile] = None,
    tos_version: Optional[str] = None,
    timezone: str = "",
    avatar_source: str = UserProfile.AVATAR_FROM_GRAVATAR,
    default_language: str = "en",
    default_sending_stream: Optional[Stream] = None,
    default_events_register_stream: Optional[Stream] = None,
    default_all_public_streams: Optional[bool] = None,
    prereg_user: Optional[PreregistrationUser] = None,
    prereg_realm: Optional[PreregistrationRealm] = None,
    default_stream_groups: Sequence[DefaultStreamGroup] = [],
    source_profile: Optional[UserProfile] = None,
    realm_creation: bool = False,
    *,
    acting_user: Optional[UserProfile],
    enable_marketing_emails: bool = True,
    email_address_visibility: Optional[int] = None,
) -> UserProfile:
    with transaction.atomic():
        user_profile = create_user(
            email=email,
            password=password,
            realm=realm,
            full_name=full_name,
            role=role,
            bot_type=bot_type,
            bot_owner=bot_owner,
            tos_version=tos_version,
            timezone=timezone,
            avatar_source=avatar_source,
            default_language=default_language,
            default_sending_stream=default_sending_stream,
            default_events_register_stream=default_events_register_stream,
            default_all_public_streams=default_all_public_streams,
            source_profile=source_profile,
            enable_marketing_emails=enable_marketing_emails,
            email_address_visibility=email_address_visibility,
        )

        event_time = user_profile.date_joined
        if not acting_user:
            acting_user = user_profile
        RealmAuditLog.objects.create(
            realm=user_profile.realm,
            acting_user=acting_user,
            modified_user=user_profile,
            event_type=RealmAuditLog.USER_CREATED,
            event_time=event_time,
            extra_data=orjson.dumps(
                {
                    RealmAuditLog.ROLE_COUNT: realm_user_count_by_role(user_profile.realm),
                }
            ).decode(),
        )

        if realm_creation:
            # If this user just created a realm, make sure they are
            # properly tagged as the creator of the realm.
            realm_creation_audit_log = (
                RealmAuditLog.objects.filter(event_type=RealmAuditLog.REALM_CREATED, realm=realm)
                .order_by("id")
                .last()
            )
            assert realm_creation_audit_log is not None
            realm_creation_audit_log.acting_user = user_profile
            realm_creation_audit_log.save(update_fields=["acting_user"])

        do_increment_logging_stat(
            user_profile.realm,
            COUNT_STATS["active_users_log:is_bot:day"],
            user_profile.is_bot,
            event_time,
        )
        if settings.BILLING_ENABLED:
            update_license_ledger_if_needed(user_profile.realm, event_time)

        system_user_group = get_system_user_group_for_user(user_profile)
        UserGroupMembership.objects.create(user_profile=user_profile, user_group=system_user_group)
        RealmAuditLog.objects.create(
            realm=user_profile.realm,
            modified_user=user_profile,
            modified_user_group=system_user_group,
            event_type=RealmAuditLog.USER_GROUP_DIRECT_USER_MEMBERSHIP_ADDED,
            event_time=event_time,
            acting_user=acting_user,
        )

        if user_profile.role == UserProfile.ROLE_MEMBER and not user_profile.is_provisional_member:
            full_members_system_group = UserGroup.objects.get(
                name=UserGroup.FULL_MEMBERS_GROUP_NAME,
                realm=user_profile.realm,
                is_system_group=True,
            )
            UserGroupMembership.objects.create(
                user_profile=user_profile, user_group=full_members_system_group
            )
            RealmAuditLog.objects.create(
                realm=user_profile.realm,
                modified_user=user_profile,
                modified_user_group=full_members_system_group,
                event_type=RealmAuditLog.USER_GROUP_DIRECT_USER_MEMBERSHIP_ADDED,
                event_time=event_time,
                acting_user=acting_user,
            )

    # Note that for bots, the caller will send an additional event
    # with bot-specific info like services.
    notify_created_user(user_profile)

    do_send_user_group_members_update_event("add_members", system_user_group, [user_profile.id])
    if user_profile.role == UserProfile.ROLE_MEMBER and not user_profile.is_provisional_member:
        do_send_user_group_members_update_event(
            "add_members", full_members_system_group, [user_profile.id]
        )

    if prereg_realm is not None:
        prereg_realm.created_user = user_profile
        prereg_realm.save(update_fields=["created_user"])

    if bot_type is None:
        process_new_human_user(
            user_profile,
            prereg_user=prereg_user,
            default_stream_groups=default_stream_groups,
            realm_creation=realm_creation,
        )

    if realm_creation:
        assert realm.signup_notifications_stream is not None
        bulk_add_subscriptions(
            realm, [realm.signup_notifications_stream], [user_profile], acting_user=None
        )

        from zerver.lib.onboarding import send_initial_realm_messages

        send_initial_realm_messages(realm)

    return user_profile


def do_activate_mirror_dummy_user(
    user_profile: UserProfile, *, acting_user: Optional[UserProfile]
) -> None:
    """Called to have a user "take over" a "mirror dummy" user
    (i.e. is_mirror_dummy=True) account when they sign up with the
    same email address.

    Essentially, the result should be as though we had created the
    UserProfile just now with do_create_user, except that the mirror
    dummy user may appear as the recipient or sender of messages from
    before their account was fully created.

    TODO: This function likely has bugs resulting from this being a
    parallel code path to do_create_user; e.g. it likely does not
    handle preferences or default streams properly.
    """
    with transaction.atomic():
        change_user_is_active(user_profile, True)
        user_profile.is_mirror_dummy = False
        user_profile.set_unusable_password()
        user_profile.date_joined = timezone_now()
        user_profile.tos_version = settings.TERMS_OF_SERVICE_VERSION
        user_profile.save(
            update_fields=["date_joined", "password", "is_mirror_dummy", "tos_version"]
        )

        event_time = user_profile.date_joined
        RealmAuditLog.objects.create(
            realm=user_profile.realm,
            modified_user=user_profile,
            acting_user=acting_user,
            event_type=RealmAuditLog.USER_ACTIVATED,
            event_time=event_time,
            extra_data=orjson.dumps(
                {
                    RealmAuditLog.ROLE_COUNT: realm_user_count_by_role(user_profile.realm),
                }
            ).decode(),
        )
        do_increment_logging_stat(
            user_profile.realm,
            COUNT_STATS["active_users_log:is_bot:day"],
            user_profile.is_bot,
            event_time,
        )
        if settings.BILLING_ENABLED:
            update_license_ledger_if_needed(user_profile.realm, event_time)

    notify_created_user(user_profile)


@transaction.atomic(savepoint=False)
def do_reactivate_user(user_profile: UserProfile, *, acting_user: Optional[UserProfile]) -> None:
    """Reactivate a user that had previously been deactivated"""
    change_user_is_active(user_profile, True)

    event_time = timezone_now()
    RealmAuditLog.objects.create(
        realm=user_profile.realm,
        modified_user=user_profile,
        acting_user=acting_user,
        event_type=RealmAuditLog.USER_REACTIVATED,
        event_time=event_time,
        extra_data=orjson.dumps(
            {
                RealmAuditLog.ROLE_COUNT: realm_user_count_by_role(user_profile.realm),
            }
        ).decode(),
    )
    do_increment_logging_stat(
        user_profile.realm,
        COUNT_STATS["active_users_log:is_bot:day"],
        user_profile.is_bot,
        event_time,
    )
    if settings.BILLING_ENABLED:
        update_license_ledger_if_needed(user_profile.realm, event_time)

    notify_created_user(user_profile)

    if user_profile.is_bot:
        notify_created_bot(user_profile)

    subscribed_recipient_ids = Subscription.objects.filter(
        user_profile_id=user_profile.id, active=True, recipient__type=Recipient.STREAM
    ).values_list("recipient__type_id", flat=True)
    subscribed_streams = Stream.objects.filter(id__in=subscribed_recipient_ids, deactivated=False)
    subscriber_peer_info = bulk_get_subscriber_peer_info(
        realm=user_profile.realm,
        streams=subscribed_streams,
    )

    altered_user_dict: Dict[int, Set[int]] = defaultdict(set)
    for stream in subscribed_streams:
        altered_user_dict[stream.id] = {user_profile.id}

    stream_dict = {stream.id: stream for stream in subscribed_streams}

    send_peer_subscriber_events(
        op="peer_add",
        realm=user_profile.realm,
        altered_user_dict=altered_user_dict,
        stream_dict=stream_dict,
        private_peer_dict=subscriber_peer_info.private_peer_dict,
    )