mirror of https://github.com/zulip/zulip.git
587 lines
24 KiB
Python
587 lines
24 KiB
Python
# -*- coding: utf-8 -*-
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import base64
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import binascii
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from functools import partial
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import logging
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import lxml.html as LH
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import os
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import re
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import time
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import random
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from typing import Any, Dict, List, Optional, SupportsInt, Text, Tuple, Type, Union
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from apns2.client import APNsClient
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from apns2.payload import Payload as APNsPayload
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from django.conf import settings
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from django.utils.timezone import now as timezone_now
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from django.utils.translation import ugettext as _
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from gcm import GCM
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from hyper.http20.exceptions import HTTP20Error
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import requests
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import urllib
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import ujson
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from zerver.decorator import statsd_increment
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from zerver.lib.avatar import absolute_avatar_url
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from zerver.lib.exceptions import ErrorCode, JsonableError
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from zerver.lib.message import access_message
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from zerver.lib.queue import retry_event
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from zerver.lib.timestamp import datetime_to_timestamp, timestamp_to_datetime
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from zerver.lib.utils import generate_random_token
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from zerver.models import PushDeviceToken, Message, Recipient, UserProfile, \
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UserMessage, get_display_recipient, receives_offline_push_notifications, \
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receives_online_notifications, receives_stream_notifications, get_user_profile_by_id
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from version import ZULIP_VERSION
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if settings.ZILENCER_ENABLED:
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from zilencer.models import RemotePushDeviceToken
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else: # nocoverage -- Not convenient to add test for this.
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from mock import Mock
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RemotePushDeviceToken = Mock() # type: ignore # https://github.com/JukkaL/mypy/issues/1188
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DeviceToken = Union[PushDeviceToken, RemotePushDeviceToken]
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# We store the token as b64, but apns-client wants hex strings
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def b64_to_hex(data: bytes) -> Text:
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return binascii.hexlify(base64.b64decode(data)).decode('utf-8')
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def hex_to_b64(data: Text) -> bytes:
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return base64.b64encode(binascii.unhexlify(data.encode('utf-8')))
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#
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# Sending to APNs, for iOS
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#
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_apns_client = None # type: Optional[APNsClient]
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_apns_client_initialized = False
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def get_apns_client() -> APNsClient:
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global _apns_client, _apns_client_initialized
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if not _apns_client_initialized:
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# NB if called concurrently, this will make excess connections.
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# That's a little sloppy, but harmless unless a server gets
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# hammered with a ton of these all at once after startup.
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if settings.APNS_CERT_FILE is not None:
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_apns_client = APNsClient(credentials=settings.APNS_CERT_FILE,
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use_sandbox=settings.APNS_SANDBOX)
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_apns_client_initialized = True
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return _apns_client
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def apns_enabled() -> bool:
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client = get_apns_client()
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return client is not None
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def modernize_apns_payload(data: Dict[str, Any]) -> Dict[str, Any]:
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'''Take a payload in an unknown Zulip version's format, and return in current format.'''
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# TODO this isn't super robust as is -- if a buggy remote server
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# sends a malformed payload, we are likely to raise an exception.
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if 'message_ids' in data:
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# The format sent by 1.6.0, from the earliest pre-1.6.0
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# version with bouncer support up until 613d093d7 pre-1.7.0:
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# 'alert': str, # just sender, and text about PM/group-PM/mention
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# 'message_ids': List[int], # always just one
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return {
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'alert': data['alert'],
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'badge': 0,
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'custom': {
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'zulip': {
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'message_ids': data['message_ids'],
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},
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},
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}
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else:
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# Something already compatible with the current format.
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# `alert` may be a string, or a dict with `title` and `body`.
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# In 1.7.0 and 1.7.1, before 0912b5ba8 pre-1.8.0, the only
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# item in `custom.zulip` is `message_ids`.
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return data
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APNS_MAX_RETRIES = 3
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@statsd_increment("apple_push_notification")
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def send_apple_push_notification(user_id: int, devices: List[DeviceToken],
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payload_data: Dict[str, Any]) -> None:
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client = get_apns_client()
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if client is None:
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logging.warning("APNs: Dropping a notification because nothing configured. "
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"Set PUSH_NOTIFICATION_BOUNCER_URL (or APNS_CERT_FILE).")
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return
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logging.info("APNs: Sending notification for user %d to %d devices",
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user_id, len(devices))
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payload = APNsPayload(**modernize_apns_payload(payload_data))
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expiration = int(time.time() + 24 * 3600)
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retries_left = APNS_MAX_RETRIES
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for device in devices:
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# TODO obviously this should be made to actually use the async
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def attempt_send() -> Optional[str]:
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stream_id = client.send_notification_async(
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device.token, payload, topic='org.zulip.Zulip',
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expiration=expiration)
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try:
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return client.get_notification_result(stream_id)
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except HTTP20Error as e:
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logging.warning("APNs: HTTP error sending for user %d to device %s: %s",
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user_id, device.token, e.__class__.__name__)
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return None
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result = attempt_send()
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while result is None and retries_left > 0:
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retries_left -= 1
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result = attempt_send()
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if result is None:
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result = "HTTP error, retries exhausted"
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if result == 'Success':
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logging.info("APNs: Success sending for user %d to device %s",
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user_id, device.token)
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else:
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logging.warning("APNs: Failed to send for user %d to device %s: %s",
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user_id, device.token, result)
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# TODO delete token if status 410 (and timestamp isn't before
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# the token we have)
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#
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# Sending to GCM, for Android
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#
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if settings.ANDROID_GCM_API_KEY: # nocoverage
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gcm = GCM(settings.ANDROID_GCM_API_KEY)
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else:
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gcm = None
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def gcm_enabled() -> bool: # nocoverage
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return gcm is not None
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def send_android_push_notification_to_user(user_profile: UserProfile, data: Dict[str, Any]) -> None:
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devices = list(PushDeviceToken.objects.filter(user=user_profile,
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kind=PushDeviceToken.GCM))
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send_android_push_notification(devices, data)
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@statsd_increment("android_push_notification")
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def send_android_push_notification(devices: List[DeviceToken], data: Dict[str, Any],
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remote: bool=False) -> None:
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if not gcm:
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logging.warning("Skipping sending a GCM push notification since "
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"PUSH_NOTIFICATION_BOUNCER_URL and ANDROID_GCM_API_KEY are both unset")
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return
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reg_ids = [device.token for device in devices]
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if remote:
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DeviceTokenClass = RemotePushDeviceToken
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else:
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DeviceTokenClass = PushDeviceToken
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try:
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res = gcm.json_request(registration_ids=reg_ids, data=data, retries=10)
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except IOError as e:
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logging.warning(str(e))
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return
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if res and 'success' in res:
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for reg_id, msg_id in res['success'].items():
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logging.info("GCM: Sent %s as %s" % (reg_id, msg_id))
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# res.canonical will contain results when there are duplicate registrations for the same
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# device. The "canonical" registration is the latest registration made by the device.
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# Ref: http://developer.android.com/google/gcm/adv.html#canonical
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if 'canonical' in res:
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for reg_id, new_reg_id in res['canonical'].items():
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if reg_id == new_reg_id:
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# I'm not sure if this should happen. In any case, not really actionable.
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logging.warning("GCM: Got canonical ref but it already matches our ID %s!" % (reg_id,))
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elif not DeviceTokenClass.objects.filter(token=new_reg_id,
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kind=DeviceTokenClass.GCM).count():
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# This case shouldn't happen; any time we get a canonical ref it should have been
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# previously registered in our system.
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#
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# That said, recovery is easy: just update the current PDT object to use the new ID.
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logging.warning(
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"GCM: Got canonical ref %s replacing %s but new ID not registered! Updating." %
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(new_reg_id, reg_id))
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DeviceTokenClass.objects.filter(
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token=reg_id, kind=DeviceTokenClass.GCM).update(token=new_reg_id)
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else:
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# Since we know the new ID is registered in our system we can just drop the old one.
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logging.info("GCM: Got canonical ref %s, dropping %s" % (new_reg_id, reg_id))
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DeviceTokenClass.objects.filter(token=reg_id, kind=DeviceTokenClass.GCM).delete()
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if 'errors' in res:
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for error, reg_ids in res['errors'].items():
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if error in ['NotRegistered', 'InvalidRegistration']:
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for reg_id in reg_ids:
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logging.info("GCM: Removing %s" % (reg_id,))
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device = DeviceTokenClass.objects.get(token=reg_id, kind=DeviceTokenClass.GCM)
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device.delete()
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else:
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for reg_id in reg_ids:
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logging.warning("GCM: Delivery to %s failed: %s" % (reg_id, error))
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# python-gcm handles retrying of the unsent messages.
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# Ref: https://github.com/geeknam/python-gcm/blob/master/gcm/gcm.py#L497
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#
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# Sending to a bouncer
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#
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def uses_notification_bouncer() -> bool:
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return settings.PUSH_NOTIFICATION_BOUNCER_URL is not None
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def send_notifications_to_bouncer(user_profile_id: int,
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apns_payload: Dict[str, Any],
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gcm_payload: Dict[str, Any]) -> None:
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post_data = {
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'user_id': user_profile_id,
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'apns_payload': apns_payload,
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'gcm_payload': gcm_payload,
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}
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send_json_to_push_bouncer('POST', 'notify', post_data)
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def send_json_to_push_bouncer(method: str, endpoint: str, post_data: Dict[str, Any]) -> None:
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send_to_push_bouncer(
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method,
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endpoint,
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ujson.dumps(post_data),
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extra_headers={"Content-type": "application/json"},
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)
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class PushNotificationBouncerException(Exception):
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pass
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def send_to_push_bouncer(method: str,
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endpoint: str,
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post_data: Union[Text, Dict[str, Any]],
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extra_headers: Optional[Dict[str, Any]]=None) -> None:
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"""While it does actually send the notice, this function has a lot of
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code and comments around error handling for the push notifications
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bouncer. There are several classes of failures, each with its own
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potential solution:
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* Network errors with requests.request. We let those happen normally.
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* 500 errors from the push bouncer or other unexpected responses;
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we don't try to parse the response, but do make clear the cause.
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* 400 errors from the push bouncer. Here there are 2 categories:
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Our server failed to connect to the push bouncer (should throw)
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vs. client-side errors like and invalid token.
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"""
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url = urllib.parse.urljoin(settings.PUSH_NOTIFICATION_BOUNCER_URL,
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'/api/v1/remotes/push/' + endpoint)
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api_auth = requests.auth.HTTPBasicAuth(settings.ZULIP_ORG_ID,
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settings.ZULIP_ORG_KEY)
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headers = {"User-agent": "ZulipServer/%s" % (ZULIP_VERSION,)}
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if extra_headers is not None:
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headers.update(extra_headers)
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res = requests.request(method,
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url,
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data=post_data,
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auth=api_auth,
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timeout=30,
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verify=True,
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headers=headers)
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if res.status_code >= 500:
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# 500s should be resolved by the people who run the push
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# notification bouncer service, since they'll get an email
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# too. For now we email the server admin, but we'll likely
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# want to do some sort of retry logic eventually.
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raise PushNotificationBouncerException(
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_("Received 500 from push notification bouncer"))
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elif res.status_code >= 400:
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# If JSON parsing errors, just let that exception happen
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result_dict = ujson.loads(res.content)
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msg = result_dict['msg']
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if 'code' in result_dict and result_dict['code'] == 'INVALID_ZULIP_SERVER':
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# Invalid Zulip server credentials should email this server's admins
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raise PushNotificationBouncerException(
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_("Push notifications bouncer error: %s") % (msg,))
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else:
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# But most other errors coming from the push bouncer
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# server are client errors (e.g. never-registered token)
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# and should be handled as such.
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raise JsonableError(msg)
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elif res.status_code != 200:
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# Anything else is unexpected and likely suggests a bug in
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# this version of Zulip, so we throw an exception that will
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# email the server admins.
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raise PushNotificationBouncerException(
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"Push notification bouncer returned unexpected status code %s" % (res.status_code,))
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# If we don't throw an exception, it's a successful bounce!
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#
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# Managing device tokens
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#
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def num_push_devices_for_user(user_profile: UserProfile, kind: Optional[int]=None) -> PushDeviceToken:
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if kind is None:
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return PushDeviceToken.objects.filter(user=user_profile).count()
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else:
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return PushDeviceToken.objects.filter(user=user_profile, kind=kind).count()
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def add_push_device_token(user_profile: UserProfile,
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token_str: bytes,
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kind: int,
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ios_app_id: Optional[str]=None) -> None:
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logging.info("New push device: %d %r %d %r",
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user_profile.id, token_str, kind, ios_app_id)
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# If we're sending things to the push notification bouncer
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# register this user with them here
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if uses_notification_bouncer():
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post_data = {
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'server_uuid': settings.ZULIP_ORG_ID,
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'user_id': user_profile.id,
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'token': token_str,
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'token_kind': kind,
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}
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if kind == PushDeviceToken.APNS:
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post_data['ios_app_id'] = ios_app_id
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logging.info("Sending new push device to bouncer: %r", post_data)
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send_to_push_bouncer('POST', 'register', post_data)
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return
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# If another user was previously logged in on the same device and didn't
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# properly log out, the token will still be registered to the wrong account
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PushDeviceToken.objects.filter(token=token_str).exclude(user=user_profile).delete()
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# Overwrite with the latest value
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token, created = PushDeviceToken.objects.get_or_create(user=user_profile,
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token=token_str,
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defaults=dict(
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kind=kind,
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ios_app_id=ios_app_id))
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if not created:
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logging.info("Existing push device updated.")
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token.last_updated = timezone_now()
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token.save(update_fields=['last_updated'])
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else:
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logging.info("New push device created.")
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def remove_push_device_token(user_profile: UserProfile, token_str: bytes, kind: int) -> None:
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# If we're sending things to the push notification bouncer
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# register this user with them here
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if uses_notification_bouncer():
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# TODO: Make this a remove item
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post_data = {
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'server_uuid': settings.ZULIP_ORG_ID,
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'user_id': user_profile.id,
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'token': token_str,
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'token_kind': kind,
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}
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send_to_push_bouncer("POST", "unregister", post_data)
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return
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try:
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token = PushDeviceToken.objects.get(token=token_str, kind=kind)
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token.delete()
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except PushDeviceToken.DoesNotExist:
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raise JsonableError(_("Token does not exist"))
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#
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# Push notifications in general
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#
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def push_notifications_enabled() -> bool:
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'''True just if this server has configured a way to send push notifications.'''
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if (uses_notification_bouncer()
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and settings.ZULIP_ORG_KEY is not None
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and settings.ZULIP_ORG_ID is not None): # nocoverage
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# We have the needed configuration to send push notifications through
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# the bouncer. Better yet would be to confirm that this config actually
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# works -- e.g., that we have ever successfully sent to the bouncer --
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# but this is a good start.
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return True
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if apns_enabled() and gcm_enabled(): # nocoverage
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# We have the needed configuration to send through APNs and GCM directly
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# (i.e., we are the bouncer, presumably.) Again, assume it actually works.
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return True
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return False
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def get_alert_from_message(message: Message) -> Text:
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"""
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Determine what alert string to display based on the missed messages.
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"""
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sender_str = message.sender.full_name
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if message.recipient.type == Recipient.HUDDLE and message.trigger == 'private_message':
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return "New private group message from %s" % (sender_str,)
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elif message.recipient.type == Recipient.PERSONAL and message.trigger == 'private_message':
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return "New private message from %s" % (sender_str,)
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elif message.is_stream_message() and message.trigger == 'mentioned':
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return "New mention from %s" % (sender_str,)
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elif (message.is_stream_message() and
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(message.trigger == 'stream_push_notify' and message.stream_name)):
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return "New stream message from %s in %s" % (sender_str, message.stream_name,)
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else:
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return "New Zulip mentions and private messages from %s" % (sender_str,)
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def get_mobile_push_content(rendered_content: Text) -> Text:
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def get_text(elem: LH.HtmlElement) -> Text:
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# Convert default emojis to their unicode equivalent.
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classes = elem.get("class", "")
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if "emoji" in classes:
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match = re.search("emoji-(?P<emoji_code>\S+)", classes)
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if match:
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emoji_code = match.group('emoji_code')
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char_repr = ""
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for codepoint in emoji_code.split('-'):
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char_repr += chr(int(codepoint, 16))
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return char_repr
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# Handles realm emojis, avatars etc.
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if elem.tag == "img":
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return elem.get("alt", "")
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return elem.text or ""
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def process(elem: LH.HtmlElement) -> Text:
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plain_text = get_text(elem)
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for child in elem:
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plain_text += process(child)
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plain_text += elem.tail or ""
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return plain_text
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if settings.PUSH_NOTIFICATION_REDACT_CONTENT:
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return "***REDACTED***"
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else:
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elem = LH.fromstring(rendered_content)
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plain_text = process(elem)
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return plain_text
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def truncate_content(content: Text) -> Tuple[Text, bool]:
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# We use unicode character 'HORIZONTAL ELLIPSIS' (U+2026) instead
|
|
# of three dots as this saves two extra characters for textual
|
|
# content. This function will need to be updated to handle unicode
|
|
# combining characters and tags when we start supporting themself.
|
|
if len(content) <= 200:
|
|
return content, False
|
|
return content[:200] + "…", True
|
|
|
|
def get_common_payload(message: Message) -> Dict[str, Any]:
|
|
data = {} # type: Dict[str, Any]
|
|
|
|
# These will let the app support logging into multiple realms and servers.
|
|
data['server'] = settings.EXTERNAL_HOST
|
|
data['realm_id'] = message.sender.realm.id
|
|
|
|
# `sender_id` is preferred, but some existing versions use `sender_email`.
|
|
data['sender_id'] = message.sender.id
|
|
data['sender_email'] = message.sender.email
|
|
|
|
if message.is_stream_message():
|
|
data['recipient_type'] = "stream"
|
|
data['stream'] = get_display_recipient(message.recipient)
|
|
data['topic'] = message.subject
|
|
else:
|
|
data['recipient_type'] = "private"
|
|
|
|
return data
|
|
|
|
def get_apns_payload(message: Message) -> Dict[str, Any]:
|
|
zulip_data = get_common_payload(message)
|
|
zulip_data.update({
|
|
'message_ids': [message.id],
|
|
})
|
|
|
|
content, _ = truncate_content(get_mobile_push_content(message.rendered_content))
|
|
apns_data = {
|
|
'alert': {
|
|
'title': get_alert_from_message(message),
|
|
'body': content,
|
|
},
|
|
'badge': 0, # TODO: set badge count in a better way
|
|
'custom': {'zulip': zulip_data},
|
|
}
|
|
return apns_data
|
|
|
|
def get_gcm_payload(user_profile: UserProfile, message: Message) -> Dict[str, Any]:
|
|
data = get_common_payload(message)
|
|
content, truncated = truncate_content(get_mobile_push_content(message.rendered_content))
|
|
data.update({
|
|
'user': user_profile.email,
|
|
'event': 'message',
|
|
'alert': get_alert_from_message(message),
|
|
'zulip_message_id': message.id, # message_id is reserved for CCS
|
|
'time': datetime_to_timestamp(message.pub_date),
|
|
'content': content,
|
|
'content_truncated': truncated,
|
|
'sender_full_name': message.sender.full_name,
|
|
'sender_avatar_url': absolute_avatar_url(message.sender),
|
|
})
|
|
return data
|
|
|
|
@statsd_increment("push_notifications")
|
|
def handle_push_notification(user_profile_id: int, missed_message: Dict[str, Any]) -> None:
|
|
"""
|
|
missed_message is the event received by the
|
|
zerver.worker.queue_processors.PushNotificationWorker.consume function.
|
|
"""
|
|
user_profile = get_user_profile_by_id(user_profile_id)
|
|
if not (receives_offline_push_notifications(user_profile) or
|
|
receives_online_notifications(user_profile)):
|
|
return
|
|
|
|
user_profile = get_user_profile_by_id(user_profile_id)
|
|
(message, user_message) = access_message(user_profile, missed_message['message_id'])
|
|
if user_message is not None:
|
|
# If ther user has read the message already, don't push-notify.
|
|
#
|
|
# TODO: It feels like this is already handled when things are
|
|
# put in the queue; maybe we should centralize this logic with
|
|
# the `zerver/tornado/event_queue.py` logic?
|
|
if user_message.flags.read:
|
|
return
|
|
else:
|
|
# Users should only be getting push notifications into this
|
|
# queue for messages they haven't received if they're
|
|
# long-term idle; anything else is likely a bug.
|
|
if not user_profile.long_term_idle:
|
|
logging.error("Could not find UserMessage with message_id %s and user_id %s" % (
|
|
missed_message['message_id'], user_profile_id))
|
|
return
|
|
|
|
message.trigger = missed_message['trigger']
|
|
message.stream_name = missed_message.get('stream_name', None)
|
|
|
|
apns_payload = get_apns_payload(message)
|
|
gcm_payload = get_gcm_payload(user_profile, message)
|
|
logging.info("Sending push notification to user %s" % (user_profile_id,))
|
|
|
|
if uses_notification_bouncer():
|
|
try:
|
|
send_notifications_to_bouncer(user_profile_id,
|
|
apns_payload,
|
|
gcm_payload)
|
|
except requests.ConnectionError:
|
|
def failure_processor(event: Dict[str, Any]) -> None:
|
|
logging.warning(
|
|
"Maximum retries exceeded for trigger:%s event:push_notification" % (
|
|
event['user_profile_id']))
|
|
retry_event('missedmessage_mobile_notifications', missed_message,
|
|
failure_processor)
|
|
return
|
|
|
|
android_devices = list(PushDeviceToken.objects.filter(user=user_profile,
|
|
kind=PushDeviceToken.GCM))
|
|
|
|
apple_devices = list(PushDeviceToken.objects.filter(user=user_profile,
|
|
kind=PushDeviceToken.APNS))
|
|
|
|
if apple_devices:
|
|
send_apple_push_notification(user_profile.id, apple_devices,
|
|
apns_payload)
|
|
|
|
if android_devices:
|
|
send_android_push_notification(android_devices, gcm_payload)
|