moviewyrm/bookwyrm/broadcast.py
2020-09-29 21:08:04 -07:00

90 lines
2.8 KiB
Python

''' send out activitypub messages '''
import json
from django.utils.http import http_date
import requests
from bookwyrm import models
from bookwyrm.activitypub import ActivityEncoder
from bookwyrm.tasks import app
from bookwyrm.signatures import make_signature, make_digest
def get_public_recipients(user, software=None):
''' everybody and their public inboxes '''
followers = user.followers.filter(local=False)
if software:
# TODO: eventually we may want to handle particular software differently
followers = followers.filter(bookwyrm_user=(software == 'bookwyrm'))
# we want shared inboxes when available
shared = followers.filter(
shared_inbox__isnull=False
).values_list('shared_inbox', flat=True).distinct()
# if a user doesn't have a shared inbox, we need their personal inbox
# iirc pixelfed doesn't have shared inboxes
inboxes = followers.filter(
shared_inbox__isnull=True
).values_list('inbox', flat=True)
return list(shared) + list(inboxes)
def broadcast(sender, activity, software=None, \
privacy='public', direct_recipients=None):
''' send out an event '''
# start with parsing the direct recipients
recipients = [u.inbox for u in direct_recipients or []]
# and then add any other recipients
# TODO: other kinds of privacy
if privacy == 'public':
recipients += get_public_recipients(sender, software=software)
broadcast_task.delay(
sender.id,
json.dumps(activity, cls=ActivityEncoder),
recipients
)
@app.task
def broadcast_task(sender_id, activity, recipients):
''' the celery task for broadcast '''
sender = models.User.objects.get(id=sender_id)
errors = []
for recipient in recipients:
try:
sign_and_send(sender, activity, recipient)
except requests.exceptions.HTTPError as e:
# TODO: maybe keep track of users who cause errors
errors.append({
'error': str(e),
'recipient': recipient,
'activity': activity,
})
return errors
def sign_and_send(sender, activity, destination):
''' crpyto whatever and http junk '''
now = http_date()
if not sender.private_key:
# this shouldn't happen. it would be bad if it happened.
raise ValueError('No private key found for sender')
data = json.dumps(activity).encode('utf-8')
digest = make_digest(data)
response = requests.post(
destination,
data=data,
headers={
'Date': now,
'Digest': digest,
'Signature': make_signature(sender, destination, now, digest),
'Content-Type': 'application/activity+json; charset=utf-8',
},
)
if not response.ok:
response.raise_for_status()
return response