moviewyrm/bookwyrm/incoming.py

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''' handles all of the activity coming in to the server '''
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import json
from urllib.parse import urldefrag
import django.db.utils
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from django.http import HttpResponse
from django.http import HttpResponseBadRequest, HttpResponseNotFound
from django.views.decorators.csrf import csrf_exempt
import requests
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from bookwyrm import activitypub, models, outgoing
from bookwyrm import status as status_builder
from bookwyrm.tasks import app
from bookwyrm.signatures import Signature
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@csrf_exempt
def inbox(request, username):
''' incoming activitypub events '''
try:
models.User.objects.get(localname=username)
except models.User.DoesNotExist:
return HttpResponseNotFound()
return shared_inbox(request)
@csrf_exempt
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def shared_inbox(request):
''' incoming activitypub events '''
if request.method == 'GET':
return HttpResponseNotFound()
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try:
resp = request.body
activity = json.loads(resp)
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if isinstance(activity, str):
activity = json.loads(activity)
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activity_object = activity['object']
except (json.decoder.JSONDecodeError, KeyError):
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return HttpResponseBadRequest()
if not has_valid_signature(request, activity):
if activity['type'] == 'Delete':
# Pretend that unauth'd deletes succeed. Auth may be failing because
# the resource or owner of the resource might have been deleted.
return HttpResponse()
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return HttpResponse(status=401)
handlers = {
'Follow': handle_follow,
'Accept': handle_follow_accept,
'Reject': handle_follow_reject,
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'Create': handle_create,
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'Delete': handle_delete_status,
'Like': handle_favorite,
'Announce': handle_boost,
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'Add': {
'Edition': handle_add,
'Work': handle_add,
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},
'Undo': {
'Follow': handle_unfollow,
'Like': handle_unfavorite,
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'Announce': handle_unboost,
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},
'Update': {
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'Person': handle_update_user,
'Edition': handle_update_book,
'Work': handle_update_book,
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},
}
activity_type = activity['type']
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handler = handlers.get(activity_type, None)
if isinstance(handler, dict):
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handler = handler.get(activity_object['type'], None)
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if not handler:
return HttpResponseNotFound()
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handler.delay(activity)
return HttpResponse()
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def has_valid_signature(request, activity):
''' verify incoming signature '''
try:
signature = Signature.parse(request)
key_actor = urldefrag(signature.key_id).url
if key_actor != activity.get('actor'):
raise ValueError("Wrong actor created signature.")
remote_user = activitypub.resolve_remote_id(models.User, key_actor)
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if not remote_user:
return False
try:
signature.verify(remote_user.key_pair.public_key, request)
except ValueError:
old_key = remote_user.key_pair.public_key
remote_user = activitypub.resolve_remote_id(
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models.User, remote_user.remote_id, refresh=True
)
if remote_user.key_pair.public_key == old_key:
raise # Key unchanged.
signature.verify(remote_user.key_pair.public_key, request)
except (ValueError, requests.exceptions.HTTPError):
return False
return True
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@app.task
def handle_follow(activity):
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''' someone wants to follow a local user '''
try:
relationship = activitypub.Follow(
**activity
).to_model(models.UserFollowRequest)
except django.db.utils.IntegrityError as err:
if err.__cause__.diag.constraint_name != 'userfollowrequest_unique':
raise
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relationship = models.UserFollowRequest.objects.get(
remote_id=activity['id']
)
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# send the accept normally for a duplicate request
manually_approves = relationship.user_object.manually_approves_followers
status_builder.create_notification(
relationship.user_object,
'FOLLOW_REQUEST' if manually_approves else 'FOLLOW',
related_user=relationship.user_subject
)
if not manually_approves:
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outgoing.handle_accept(relationship)
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@app.task
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def handle_unfollow(activity):
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''' unfollow a local user '''
obj = activity['object']
requester = activitypub.resolve_remote_id(models.user, obj['actor'])
to_unfollow = models.User.objects.get(remote_id=obj['object'])
# raises models.User.DoesNotExist
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to_unfollow.followers.remove(requester)
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@app.task
def handle_follow_accept(activity):
''' hurray, someone remote accepted a follow request '''
# figure out who they want to follow
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requester = models.User.objects.get(remote_id=activity['object']['actor'])
# figure out who they are
accepter = activitypub.resolve_remote_id(models.User, activity['actor'])
try:
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request = models.UserFollowRequest.objects.get(
user_subject=requester,
user_object=accepter
)
request.delete()
except models.UserFollowRequest.DoesNotExist:
pass
accepter.followers.add(requester)
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@app.task
def handle_follow_reject(activity):
''' someone is rejecting a follow request '''
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requester = models.User.objects.get(remote_id=activity['object']['actor'])
rejecter = activitypub.resolve_remote_id(models.User, activity['actor'])
request = models.UserFollowRequest.objects.get(
user_subject=requester,
user_object=rejecter
)
request.delete()
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#raises models.UserFollowRequest.DoesNotExist
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@app.task
def handle_create(activity):
''' someone did something, good on them '''
# deduplicate incoming activities
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activity = activity['object']
status_id = activity['id']
if models.Status.objects.filter(remote_id=status_id).count():
return
serializer = activitypub.activity_objects[activity['type']]
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activity = serializer(**activity)
try:
model = models.activity_models[activity.type]
except KeyError:
# not a type of status we are prepared to deserialize
return
if activity.type == 'Note':
# keep notes if they are replies to existing statuses
reply = models.Status.objects.filter(
remote_id=activity.inReplyTo
).first()
if not reply:
discard = True
# keep notes if they mention local users
tags = [l['href'] for l in activity.tag if l['type'] == 'Mention']
for tag in tags:
if models.User.objects.filter(
remote_id=tag, local=True).exists():
# we found a mention of a known use boost
discard = False
break
if discard:
return
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status = activity.to_model(model)
# create a notification if this is a reply
if status.reply_parent and status.reply_parent.user.local:
status_builder.create_notification(
status.reply_parent.user,
'REPLY',
related_user=status.user,
related_status=status,
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)
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@app.task
def handle_delete_status(activity):
''' remove a status '''
try:
status_id = activity['object']['id']
except TypeError:
# this isn't a great fix, because you hit this when mastadon
# is trying to delete a user.
return
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try:
status = models.Status.objects.select_subclasses().get(
remote_id=status_id
)
except models.Status.DoesNotExist:
return
status_builder.delete_status(status)
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@app.task
def handle_favorite(activity):
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''' approval of your good good post '''
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fav = activitypub.Like(**activity)
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fav = fav.to_model(models.Favorite)
if fav.user.local:
return
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status_builder.create_notification(
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fav.status.user,
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'FAVORITE',
related_user=fav.user,
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related_status=fav.status,
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)
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@app.task
def handle_unfavorite(activity):
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''' approval of your good good post '''
like = models.Favorite.objects.filter(
remote_id=activity['object']['id']
).first()
if not like:
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return
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like.delete()
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@app.task
def handle_boost(activity):
''' someone gave us a boost! '''
try:
boost = activitypub.Boost(**activity).to_model(models.Boost)
except activitypub.ActivitySerializerError:
# this probably just means we tried to boost an unknown status
return
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if not boost.user.local:
status_builder.create_notification(
boost.boosted_status.user,
'BOOST',
related_user=boost.user,
related_status=boost.boosted_status,
)
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@app.task
def handle_unboost(activity):
''' someone gave us a boost! '''
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boost = models.Boost.objects.filter(
remote_id=activity['object']['id']
).first()
if boost:
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boost.delete()
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@app.task
def handle_add(activity):
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''' putting a book on a shelf '''
#this is janky as heck but I haven't thought of a better solution
try:
activitypub.AddBook(**activity).to_model(models.ShelfBook)
except activitypub.ActivitySerializerError:
activitypub.AddBook(**activity).to_model(models.Tag)
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@app.task
def handle_update_user(activity):
''' receive an updated user Person activity object '''
try:
user = models.User.objects.get(remote_id=activity['object']['id'])
except models.User.DoesNotExist:
# who is this person? who cares
return
activitypub.Person(
**activity['object']
).to_model(models.User, instance=user)
# model save() happens in the to_model function
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@app.task
def handle_update_book(activity):
''' a remote instance changed a book (Document) '''
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activitypub.Edition(**activity['object']).to_model(models.Edition)