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
from bookwyrm import activitypub, books_manager, models, outgoing
from bookwyrm import status as status_builder
from bookwyrm.remote_user import get_or_create_remote_user, refresh_remote_user
from bookwyrm.tasks import app
from bookwyrm.signatures import Signature
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@csrf_exempt
def inbox(request, username):
''' incoming activitypub events '''
# TODO: should do some kind of checking if the user accepts
# this action from the sender probably? idk
# but this will just throw a 404 if the user doesn't exist
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 '''
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# TODO: should this be functionally different from the non-shared inbox??
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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': {
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'Tag': handle_tag,
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},
'Undo': {
'Follow': handle_unfollow,
'Like': handle_unfavorite,
},
'Update': {
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'Person': handle_update_user,
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'Document': 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 = get_or_create_remote_user(key_actor)
try:
signature.verify(remote_user.public_key, request)
except ValueError:
old_key = remote_user.public_key
refresh_remote_user(remote_user)
if remote_user.public_key == old_key:
raise # Key unchanged.
signature.verify(remote_user.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 '''
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# figure out who they want to follow -- not using get_or_create because
# we only care if you want to follow local users
try:
to_follow = models.User.objects.get(remote_id=activity['object'])
except models.User.DoesNotExist:
# some rando, who cares
return
if not to_follow.local:
# just ignore follow alerts about other servers. maybe they should be
# handled. maybe they shouldn't be sent at all.
return
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# figure out who the actor is
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actor = get_or_create_remote_user(activity['actor'])
try:
relationship = models.UserFollowRequest.objects.create(
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user_subject=actor,
user_object=to_follow,
remote_id=activity['id']
)
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
if not to_follow.manually_approves_followers:
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status_builder.create_notification(
to_follow,
'FOLLOW',
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related_user=actor
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)
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outgoing.handle_accept(relationship)
else:
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# Accept will be triggered manually
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status_builder.create_notification(
to_follow,
'FOLLOW_REQUEST',
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related_user=actor
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)
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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 = get_or_create_remote_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 = get_or_create_remote_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 = get_or_create_remote_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 '''
if activity['object'].get('type') not in \
['Note', 'Comment', 'Quotation', 'Review']:
# if it's an article or unknown type, ignore it
return
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user = get_or_create_remote_user(activity['actor'])
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if user.local:
# we really oughtn't even be sending in this case
return
# render the json into an activity object
serializer = activitypub.activity_objects[activity['object']['type']]
activity = serializer(**activity['object'])
# ignore notes that aren't replies to known statuses
if activity.type == 'Note':
reply = models.Status.objects.filter(
remote_id=activity.inReplyTo
).first()
if not reply:
return
model = models.activity_models[activity.type]
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 '''
status_id = activity['object']['id']
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 '''
fav = activitypub.Like(**activity['object'])
# raises ValueError in to_model if a foreign key could not be resolved in
liker = get_or_create_remote_user(activity['actor'])
if liker.local:
return
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status = fav.to_model(models.Favorite)
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status_builder.create_notification(
status.user,
'FAVORITE',
related_user=liker,
related_status=status,
)
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@app.task
def handle_unfavorite(activity):
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''' approval of your good good post '''
like = activitypub.Like(**activity['object'])
fav = models.Favorite.objects.filter(remote_id=like.id).first()
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fav.delete()
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@app.task
def handle_boost(activity):
''' someone gave us a boost! '''
status_id = activity['object'].split('/')[-1]
status = models.Status.objects.get(id=status_id)
booster = get_or_create_remote_user(activity['actor'])
if not booster.local:
status_builder.create_boost_from_activity(booster, activity)
status_builder.create_notification(
status.user,
'BOOST',
related_user=booster,
related_status=status,
)
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@app.task
def handle_tag(activity):
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''' someone is tagging a book '''
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user = get_or_create_remote_user(activity['actor'])
if not user.local:
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book = activity['target']['id']
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status_builder.create_tag(user, book, activity['object']['name'])
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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) '''
document = activity['object']
# check if we have their copy and care about their updates
book = models.Book.objects.select_subclasses().filter(
remote_id=document['url'],
sync=True,
).first()
if not book:
return
books_manager.update_book(book, data=document)