moviewyrm/fedireads/api.py
2020-01-28 11:45:27 -08:00

82 lines
2.6 KiB
Python

''' api utilties '''
from base64 import b64encode
from Crypto.PublicKey import RSA
from Crypto.Signature import pkcs1_15
from Crypto.Hash import SHA256
from datetime import datetime
import json
import requests
from fedireads import models
from fedireads import incoming
from fedireads.settings import DOMAIN
def get_or_create_remote_user(actor):
''' look up a remote user or add them '''
try:
user = models.User.objects.get(actor=actor)
except models.User.DoesNotExist:
# TODO: how do you actually correctly learn this?
username = '%s@%s' % (actor.split('/')[-1], actor.split('/')[2])
user = models.User.objects.create_user(
username,
'', '',
actor=actor,
local=False
)
return user
def get_recipients(user, post_privacy, direct_recipients=None):
''' deduplicated list of recipients '''
recipients = direct_recipients or []
followers = user.followers.all()
if post_privacy == 'public':
# post to public shared inboxes
shared_inboxes = set(u.shared_inbox for u in followers)
recipients += list(shared_inboxes)
# TODO: direct to anyone who's mentioned
if post_privacy == 'followers':
# don't send it to the shared inboxes
inboxes = set(u.inbox for u in followers)
recipients += list(inboxes)
# if post privacy is direct, we just have direct recipients,
# which is already set. hurray
return recipients
def broadcast(sender, action, recipients):
''' send out an event '''
for recipient in recipients:
# TODO: error handling
sign_and_send(sender, action, recipient)
def sign_and_send(sender, action, destination):
''' crpyto whatever and http junk '''
inbox_fragment = sender.inbox.replace('https://%s' % DOMAIN, '')
now = datetime.utcnow().isoformat()
message_to_sign = '''(request-target): post %s
host: https://%s
date: %s''' % (inbox_fragment, DOMAIN, now)
signer = pkcs1_15.new(RSA.import_key(sender.private_key))
signed_message = signer.sign(SHA256.new(message_to_sign.encode('utf8')))
signature = 'keyId="%s",' % sender.localname
signature += 'headers="(request-target) host date",'
signature += 'signature="%s"' % b64encode(signed_message)
response = requests.post(
destination,
data=json.dumps(action),
headers={
'Date': now,
'Signature': signature,
'Host': DOMAIN,
},
)
if not response.ok:
response.raise_for_status()
incoming.handle_response(response)