forked from mirrors/bookwyrm
103 lines
3.4 KiB
Python
103 lines
3.4 KiB
Python
''' send out activitypub messages '''
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import json
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from urllib.parse import urlparse
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from base64 import b64encode
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from Crypto.PublicKey import RSA
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from Crypto.Signature import pkcs1_15
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from Crypto.Hash import SHA256
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from django.utils.http import http_date
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import requests
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from fedireads import models
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from fedireads.tasks import app
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def get_public_recipients(user, software=None):
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''' everybody and their public inboxes '''
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followers = user.followers.filter(local=False)
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if software:
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# TODO: eventually we may want to handle particular software differently
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followers = followers.filter(fedireads_user=(software == 'fedireads'))
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# we want shared inboxes when available
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shared = followers.filter(
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shared_inbox__isnull=False
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).values_list('shared_inbox', flat=True).distinct()
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# if a user doesn't have a shared inbox, we need their personal inbox
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# iirc pixelfed doesn't have shared inboxes
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inboxes = followers.filter(
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shared_inbox__isnull=True
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).values_list('inbox', flat=True)
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return list(shared) + list(inboxes)
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def broadcast(sender, activity, software=None, \
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privacy='public', direct_recipients=None):
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''' send out an event '''
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# start with parsing the direct recipients
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recipients = [u.inbox for u in direct_recipients or []]
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# and then add any other recipients
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# TODO: other kinds of privacy
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if privacy == 'public':
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recipients += get_public_recipients(sender, software=software)
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broadcast_task.delay(sender.id, activity, recipients)
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@app.task
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def broadcast_task(sender_id, activity, recipients):
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''' the celery task for broadcast '''
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sender = models.User.objects.get(id=sender_id)
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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({
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'error': e,
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'recipient': recipient,
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'activity': activity,
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})
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return errors
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def make_signature(sender, destination, date):
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inbox_parts = urlparse(destination)
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signature_headers = [
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'(request-target): post %s' % inbox_parts.path,
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'host: %s' % inbox_parts.netloc,
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'date: %s' % date,
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]
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message_to_sign = '\n'.join(signature_headers)
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signer = pkcs1_15.new(RSA.import_key(sender.private_key))
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signed_message = signer.sign(SHA256.new(message_to_sign.encode('utf8')))
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signature = {
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'keyId': '%s#main-key' % sender.remote_id,
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'algorithm': 'rsa-sha256',
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'headers': '(request-target) host date',
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'signature': b64encode(signed_message).decode('utf8'),
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}
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return ','.join('%s="%s"' % (k, v) for (k, v) in signature.items())
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def sign_and_send(sender, activity, destination):
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''' crpyto whatever and http junk '''
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now = http_date()
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if not sender.private_key:
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# this shouldn't happen. it would be bad if it happened.
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raise ValueError('No private key found for sender')
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response = requests.post(
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destination,
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data=json.dumps(activity),
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headers={
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'Date': now,
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'Signature': make_signature(sender, destination, now),
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'Content-Type': 'application/activity+json; charset=utf-8',
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},
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)
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if not response.ok:
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response.raise_for_status()
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return response
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