moviewyrm/fedireads/broadcast.py

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''' send out activitypub messages '''
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from base64 import b64encode
from Crypto.PublicKey import RSA
from Crypto.Signature import pkcs1_15
from Crypto.Hash import SHA256
from django.utils.http import http_date
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import json
import requests
from urllib.parse import urlparse
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def get_recipients(user, post_privacy, direct_recipients=None):
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''' deduplicated list of recipient inboxes '''
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recipients = direct_recipients or []
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if post_privacy == 'direct':
# all we care about is direct_recipients, not followers
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return [u.inbox for u in recipients]
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# load all the followers of the user who is sending the message
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followers = user.followers.all()
if post_privacy == 'public':
# post to public shared inboxes
shared_inboxes = set(
u.shared_inbox for u in followers if u.shared_inbox
)
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recipients += list(shared_inboxes)
recipients += [u.inbox for u in followers if not u.shared_inbox]
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# 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)
return recipients
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def broadcast(sender, activity, recipients):
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''' send out an event '''
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errors = []
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for recipient in recipients:
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try:
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sign_and_send(sender, activity, recipient)
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except requests.exceptions.HTTPError as e:
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# TODO: maybe keep track of users who cause errors
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errors.append({
'error': e,
'recipient': recipient,
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'activity': activity,
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})
return errors
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def sign_and_send(sender, activity, destination):
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''' crpyto whatever and http junk '''
inbox_parts = urlparse(destination)
now = http_date()
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signature_headers = [
'(request-target): post %s' % inbox_parts.path,
'host: %s' % inbox_parts.netloc,
'date: %s' % now
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]
message_to_sign = '\n'.join(signature_headers)
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# TODO: raise an error if the user doesn't have a private key
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signer = pkcs1_15.new(RSA.import_key(sender.private_key))
signed_message = signer.sign(SHA256.new(message_to_sign.encode('utf8')))
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signature = {
'keyId': '%s#main-key' % sender.actor,
'algorithm': 'rsa-sha256',
'headers': '(request-target) host date',
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'signature': b64encode(signed_message).decode('utf8'),
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}
signature = ','.join('%s="%s"' % (k, v) for (k, v) in signature.items())
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response = requests.post(
destination,
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data=json.dumps(activity),
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headers={
'Date': now,
'Signature': signature,
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'Content-Type': 'application/activity+json; charset=utf-8',
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},
)
if not response.ok:
response.raise_for_status()
return response
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