forked from mirrors/bookwyrm
533 lines
19 KiB
Python
533 lines
19 KiB
Python
""" activitypub model functionality """
|
|
from base64 import b64encode
|
|
from collections import namedtuple
|
|
from functools import reduce
|
|
import json
|
|
import operator
|
|
import logging
|
|
from uuid import uuid4
|
|
import requests
|
|
from requests.exceptions import HTTPError, SSLError
|
|
|
|
from Crypto.PublicKey import RSA
|
|
from Crypto.Signature import pkcs1_15
|
|
from Crypto.Hash import SHA256
|
|
from django.apps import apps
|
|
from django.core.paginator import Paginator
|
|
from django.db.models import Q
|
|
from django.utils.http import http_date
|
|
|
|
from bookwyrm import activitypub
|
|
from bookwyrm.settings import USER_AGENT, PAGE_LENGTH
|
|
from bookwyrm.signatures import make_signature, make_digest
|
|
from bookwyrm.tasks import app
|
|
from bookwyrm.models.fields import ImageField, ManyToManyField
|
|
|
|
logger = logging.getLogger(__name__)
|
|
# I tried to separate these classes into mutliple files but I kept getting
|
|
# circular import errors so I gave up. I'm sure it could be done though!
|
|
|
|
PropertyField = namedtuple("PropertyField", ("set_activity_from_field"))
|
|
|
|
|
|
def set_activity_from_property_field(activity, obj, field):
|
|
""" assign a model property value to the activity json """
|
|
activity[field[1]] = getattr(obj, field[0])
|
|
|
|
|
|
class ActivitypubMixin:
|
|
""" add this mixin for models that are AP serializable """
|
|
|
|
activity_serializer = lambda: {}
|
|
reverse_unfurl = False
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
""" collect some info on model fields """
|
|
self.image_fields = []
|
|
self.many_to_many_fields = []
|
|
self.simple_fields = [] # "simple"
|
|
# sort model fields by type
|
|
for field in self._meta.get_fields():
|
|
if not hasattr(field, "field_to_activity"):
|
|
continue
|
|
|
|
if isinstance(field, ImageField):
|
|
self.image_fields.append(field)
|
|
elif isinstance(field, ManyToManyField):
|
|
self.many_to_many_fields.append(field)
|
|
else:
|
|
self.simple_fields.append(field)
|
|
|
|
# a list of allll the serializable fields
|
|
self.activity_fields = (
|
|
self.image_fields + self.many_to_many_fields + self.simple_fields
|
|
)
|
|
if hasattr(self, "property_fields"):
|
|
self.activity_fields += [
|
|
PropertyField(lambda a, o: set_activity_from_property_field(a, o, f))
|
|
for f in self.property_fields
|
|
]
|
|
|
|
# these are separate to avoid infinite recursion issues
|
|
self.deserialize_reverse_fields = (
|
|
self.deserialize_reverse_fields
|
|
if hasattr(self, "deserialize_reverse_fields")
|
|
else []
|
|
)
|
|
self.serialize_reverse_fields = (
|
|
self.serialize_reverse_fields
|
|
if hasattr(self, "serialize_reverse_fields")
|
|
else []
|
|
)
|
|
|
|
super().__init__(*args, **kwargs)
|
|
|
|
@classmethod
|
|
def find_existing_by_remote_id(cls, remote_id):
|
|
""" look up a remote id in the db """
|
|
return cls.find_existing({"id": remote_id})
|
|
|
|
@classmethod
|
|
def find_existing(cls, data):
|
|
"""compare data to fields that can be used for deduplation.
|
|
This always includes remote_id, but can also be unique identifiers
|
|
like an isbn for an edition"""
|
|
filters = []
|
|
# grabs all the data from the model to create django queryset filters
|
|
for field in cls._meta.get_fields():
|
|
if (
|
|
not hasattr(field, "deduplication_field")
|
|
or not field.deduplication_field
|
|
):
|
|
continue
|
|
|
|
value = data.get(field.get_activitypub_field())
|
|
if not value:
|
|
continue
|
|
filters.append({field.name: value})
|
|
|
|
if hasattr(cls, "origin_id") and "id" in data:
|
|
# kinda janky, but this handles special case for books
|
|
filters.append({"origin_id": data["id"]})
|
|
|
|
if not filters:
|
|
# if there are no deduplication fields, it will match the first
|
|
# item no matter what. this shouldn't happen but just in case.
|
|
return None
|
|
|
|
objects = cls.objects
|
|
if hasattr(objects, "select_subclasses"):
|
|
objects = objects.select_subclasses()
|
|
|
|
# an OR operation on all the match fields, sorry for the dense syntax
|
|
match = objects.filter(reduce(operator.or_, (Q(**f) for f in filters)))
|
|
# there OUGHT to be only one match
|
|
return match.first()
|
|
|
|
def broadcast(self, activity, sender, software=None):
|
|
""" send out an activity """
|
|
broadcast_task.delay(
|
|
sender.id,
|
|
json.dumps(activity, cls=activitypub.ActivityEncoder),
|
|
self.get_recipients(software=software),
|
|
)
|
|
|
|
def get_recipients(self, software=None):
|
|
""" figure out which inbox urls to post to """
|
|
# first we have to figure out who should receive this activity
|
|
privacy = self.privacy if hasattr(self, "privacy") else "public"
|
|
# is this activity owned by a user (statuses, lists, shelves), or is it
|
|
# general to the instance (like books)
|
|
user = self.user if hasattr(self, "user") else None
|
|
user_model = apps.get_model("bookwyrm.User", require_ready=True)
|
|
if not user and isinstance(self, user_model):
|
|
# or maybe the thing itself is a user
|
|
user = self
|
|
# find anyone who's tagged in a status, for example
|
|
mentions = self.recipients if hasattr(self, "recipients") else []
|
|
|
|
# we always send activities to explicitly mentioned users' inboxes
|
|
recipients = [u.inbox for u in mentions or []]
|
|
|
|
# unless it's a dm, all the followers should receive the activity
|
|
if privacy != "direct":
|
|
# we will send this out to a subset of all remote users
|
|
queryset = user_model.objects.filter(
|
|
local=False,
|
|
)
|
|
# filter users first by whether they're using the desired software
|
|
# this lets us send book updates only to other bw servers
|
|
if software:
|
|
queryset = queryset.filter(bookwyrm_user=(software == "bookwyrm"))
|
|
# if there's a user, we only want to send to the user's followers
|
|
if user:
|
|
queryset = queryset.filter(following=user)
|
|
|
|
# ideally, we will send to shared inboxes for efficiency
|
|
shared_inboxes = (
|
|
queryset.filter(shared_inbox__isnull=False)
|
|
.values_list("shared_inbox", flat=True)
|
|
.distinct()
|
|
)
|
|
# but not everyone has a shared inbox
|
|
inboxes = queryset.filter(shared_inbox__isnull=True).values_list(
|
|
"inbox", flat=True
|
|
)
|
|
recipients += list(shared_inboxes) + list(inboxes)
|
|
return recipients
|
|
|
|
def to_activity_dataclass(self):
|
|
""" convert from a model to an activity """
|
|
activity = generate_activity(self)
|
|
return self.activity_serializer(**activity)
|
|
|
|
def to_activity(self, **kwargs): # pylint: disable=unused-argument
|
|
""" convert from a model to a json activity """
|
|
return self.to_activity_dataclass().serialize()
|
|
|
|
|
|
class ObjectMixin(ActivitypubMixin):
|
|
""" add this mixin for object models that are AP serializable """
|
|
|
|
def save(self, *args, created=None, **kwargs):
|
|
""" broadcast created/updated/deleted objects as appropriate """
|
|
broadcast = kwargs.get("broadcast", True)
|
|
# this bonus kwarg woul cause an error in the base save method
|
|
if "broadcast" in kwargs:
|
|
del kwargs["broadcast"]
|
|
|
|
created = created or not bool(self.id)
|
|
# first off, we want to save normally no matter what
|
|
super().save(*args, **kwargs)
|
|
if not broadcast:
|
|
return
|
|
|
|
# this will work for objects owned by a user (lists, shelves)
|
|
user = self.user if hasattr(self, "user") else None
|
|
|
|
if created:
|
|
# broadcast Create activities for objects owned by a local user
|
|
if not user or not user.local:
|
|
return
|
|
|
|
try:
|
|
software = None
|
|
# do we have a "pure" activitypub version of this for mastodon?
|
|
if hasattr(self, "pure_content"):
|
|
pure_activity = self.to_create_activity(user, pure=True)
|
|
self.broadcast(pure_activity, user, software="other")
|
|
software = "bookwyrm"
|
|
# sends to BW only if we just did a pure version for masto
|
|
activity = self.to_create_activity(user)
|
|
self.broadcast(activity, user, software=software)
|
|
except AttributeError:
|
|
# janky as heck, this catches the mutliple inheritence chain
|
|
# for boosts and ignores this auxilliary broadcast
|
|
return
|
|
return
|
|
|
|
# --- updating an existing object
|
|
if not user:
|
|
# users don't have associated users, they ARE users
|
|
user_model = apps.get_model("bookwyrm.User", require_ready=True)
|
|
if isinstance(self, user_model):
|
|
user = self
|
|
# book data tracks last editor
|
|
elif hasattr(self, "last_edited_by"):
|
|
user = self.last_edited_by
|
|
# again, if we don't know the user or they're remote, don't bother
|
|
if not user or not user.local:
|
|
return
|
|
|
|
# is this a deletion?
|
|
if hasattr(self, "deleted") and self.deleted:
|
|
activity = self.to_delete_activity(user)
|
|
else:
|
|
activity = self.to_update_activity(user)
|
|
self.broadcast(activity, user)
|
|
|
|
def to_create_activity(self, user, **kwargs):
|
|
""" returns the object wrapped in a Create activity """
|
|
activity_object = self.to_activity_dataclass(**kwargs)
|
|
|
|
signature = None
|
|
create_id = self.remote_id + "/activity"
|
|
if hasattr(activity_object, "content") and activity_object.content:
|
|
signer = pkcs1_15.new(RSA.import_key(user.key_pair.private_key))
|
|
content = activity_object.content
|
|
signed_message = signer.sign(SHA256.new(content.encode("utf8")))
|
|
|
|
signature = activitypub.Signature(
|
|
creator="%s#main-key" % user.remote_id,
|
|
created=activity_object.published,
|
|
signatureValue=b64encode(signed_message).decode("utf8"),
|
|
)
|
|
|
|
return activitypub.Create(
|
|
id=create_id,
|
|
actor=user.remote_id,
|
|
to=activity_object.to,
|
|
cc=activity_object.cc,
|
|
object=activity_object,
|
|
signature=signature,
|
|
).serialize()
|
|
|
|
def to_delete_activity(self, user):
|
|
""" notice of deletion """
|
|
return activitypub.Delete(
|
|
id=self.remote_id + "/activity",
|
|
actor=user.remote_id,
|
|
to=["%s/followers" % user.remote_id],
|
|
cc=["https://www.w3.org/ns/activitystreams#Public"],
|
|
object=self,
|
|
).serialize()
|
|
|
|
def to_update_activity(self, user):
|
|
""" wrapper for Updates to an activity """
|
|
activity_id = "%s#update/%s" % (self.remote_id, uuid4())
|
|
return activitypub.Update(
|
|
id=activity_id,
|
|
actor=user.remote_id,
|
|
to=["https://www.w3.org/ns/activitystreams#Public"],
|
|
object=self,
|
|
).serialize()
|
|
|
|
|
|
class OrderedCollectionPageMixin(ObjectMixin):
|
|
"""just the paginator utilities, so you don't HAVE to
|
|
override ActivitypubMixin's to_activity (ie, for outbox)"""
|
|
|
|
@property
|
|
def collection_remote_id(self):
|
|
""" this can be overriden if there's a special remote id, ie outbox """
|
|
return self.remote_id
|
|
|
|
def to_ordered_collection(
|
|
self, queryset, remote_id=None, page=False, collection_only=False, **kwargs
|
|
):
|
|
""" an ordered collection of whatevers """
|
|
if not queryset.ordered:
|
|
raise RuntimeError("queryset must be ordered")
|
|
|
|
remote_id = remote_id or self.remote_id
|
|
if page:
|
|
return to_ordered_collection_page(queryset, remote_id, **kwargs)
|
|
|
|
if collection_only or not hasattr(self, "activity_serializer"):
|
|
serializer = activitypub.OrderedCollection
|
|
activity = {}
|
|
else:
|
|
serializer = self.activity_serializer
|
|
# a dict from the model fields
|
|
activity = generate_activity(self)
|
|
|
|
if remote_id:
|
|
activity["id"] = remote_id
|
|
|
|
paginated = Paginator(queryset, PAGE_LENGTH)
|
|
# add computed fields specific to orderd collections
|
|
activity["totalItems"] = paginated.count
|
|
activity["first"] = "%s?page=1" % remote_id
|
|
activity["last"] = "%s?page=%d" % (remote_id, paginated.num_pages)
|
|
|
|
return serializer(**activity)
|
|
|
|
|
|
class OrderedCollectionMixin(OrderedCollectionPageMixin):
|
|
""" extends activitypub models to work as ordered collections """
|
|
|
|
@property
|
|
def collection_queryset(self):
|
|
""" usually an ordered collection model aggregates a different model """
|
|
raise NotImplementedError("Model must define collection_queryset")
|
|
|
|
activity_serializer = activitypub.OrderedCollection
|
|
|
|
def to_activity_dataclass(self, **kwargs):
|
|
return self.to_ordered_collection(self.collection_queryset, **kwargs)
|
|
|
|
def to_activity(self, **kwargs):
|
|
""" an ordered collection of the specified model queryset """
|
|
return self.to_ordered_collection(
|
|
self.collection_queryset, **kwargs
|
|
).serialize()
|
|
|
|
|
|
class CollectionItemMixin(ActivitypubMixin):
|
|
""" for items that are part of an (Ordered)Collection """
|
|
|
|
activity_serializer = activitypub.Add
|
|
object_field = collection_field = None
|
|
|
|
def save(self, *args, broadcast=True, **kwargs):
|
|
""" broadcast updated """
|
|
created = not bool(self.id)
|
|
# first off, we want to save normally no matter what
|
|
super().save(*args, **kwargs)
|
|
|
|
# these shouldn't be edited, only created and deleted
|
|
if not broadcast or not created or not self.user.local:
|
|
return
|
|
|
|
# adding an obj to the collection
|
|
activity = self.to_add_activity()
|
|
self.broadcast(activity, self.user)
|
|
|
|
def delete(self, *args, **kwargs):
|
|
""" broadcast a remove activity """
|
|
activity = self.to_remove_activity()
|
|
super().delete(*args, **kwargs)
|
|
if self.user.local:
|
|
self.broadcast(activity, self.user)
|
|
|
|
def to_add_activity(self):
|
|
""" AP for shelving a book"""
|
|
object_field = getattr(self, self.object_field)
|
|
collection_field = getattr(self, self.collection_field)
|
|
return activitypub.Add(
|
|
id=self.get_remote_id(),
|
|
actor=self.user.remote_id,
|
|
object=object_field,
|
|
target=collection_field.remote_id,
|
|
).serialize()
|
|
|
|
def to_remove_activity(self):
|
|
""" AP for un-shelving a book"""
|
|
object_field = getattr(self, self.object_field)
|
|
collection_field = getattr(self, self.collection_field)
|
|
return activitypub.Remove(
|
|
id=self.get_remote_id(),
|
|
actor=self.user.remote_id,
|
|
object=object_field,
|
|
target=collection_field.remote_id,
|
|
).serialize()
|
|
|
|
|
|
class ActivityMixin(ActivitypubMixin):
|
|
""" add this mixin for models that are AP serializable """
|
|
|
|
def save(self, *args, broadcast=True, **kwargs):
|
|
""" broadcast activity """
|
|
super().save(*args, **kwargs)
|
|
user = self.user if hasattr(self, "user") else self.user_subject
|
|
if broadcast and user.local:
|
|
self.broadcast(self.to_activity(), user)
|
|
|
|
def delete(self, *args, broadcast=True, **kwargs):
|
|
""" nevermind, undo that activity """
|
|
user = self.user if hasattr(self, "user") else self.user_subject
|
|
if broadcast and user.local:
|
|
self.broadcast(self.to_undo_activity(), user)
|
|
super().delete(*args, **kwargs)
|
|
|
|
def to_undo_activity(self):
|
|
""" undo an action """
|
|
user = self.user if hasattr(self, "user") else self.user_subject
|
|
return activitypub.Undo(
|
|
id="%s#undo" % self.remote_id,
|
|
actor=user.remote_id,
|
|
object=self,
|
|
).serialize()
|
|
|
|
|
|
def generate_activity(obj):
|
|
""" go through the fields on an object """
|
|
activity = {}
|
|
for field in obj.activity_fields:
|
|
field.set_activity_from_field(activity, obj)
|
|
|
|
if hasattr(obj, "serialize_reverse_fields"):
|
|
# for example, editions of a work
|
|
for (
|
|
model_field_name,
|
|
activity_field_name,
|
|
sort_field,
|
|
) in obj.serialize_reverse_fields:
|
|
related_field = getattr(obj, model_field_name)
|
|
activity[activity_field_name] = unfurl_related_field(
|
|
related_field, sort_field=sort_field
|
|
)
|
|
|
|
if not activity.get("id"):
|
|
activity["id"] = obj.get_remote_id()
|
|
return activity
|
|
|
|
|
|
def unfurl_related_field(related_field, sort_field=None):
|
|
""" load reverse lookups (like public key owner or Status attachment """
|
|
if sort_field and hasattr(related_field, "all"):
|
|
return [
|
|
unfurl_related_field(i) for i in related_field.order_by(sort_field).all()
|
|
]
|
|
if related_field.reverse_unfurl:
|
|
# if it's a one-to-one (key pair)
|
|
if hasattr(related_field, "field_to_activity"):
|
|
return related_field.field_to_activity()
|
|
# if it's one-to-many (attachments)
|
|
return related_field.to_activity()
|
|
return related_field.remote_id
|
|
|
|
|
|
@app.task
|
|
def broadcast_task(sender_id, activity, recipients):
|
|
""" the celery task for broadcast """
|
|
user_model = apps.get_model("bookwyrm.User", require_ready=True)
|
|
sender = user_model.objects.get(id=sender_id)
|
|
for recipient in recipients:
|
|
try:
|
|
sign_and_send(sender, activity, recipient)
|
|
except (HTTPError, SSLError, requests.exceptions.ConnectionError):
|
|
pass
|
|
|
|
|
|
def sign_and_send(sender, data, destination):
|
|
""" crpyto whatever and http junk """
|
|
now = http_date()
|
|
|
|
if not sender.key_pair.private_key:
|
|
# this shouldn't happen. it would be bad if it happened.
|
|
raise ValueError("No private key found for sender")
|
|
|
|
digest = make_digest(data)
|
|
|
|
response = requests.post(
|
|
destination,
|
|
data=data,
|
|
headers={
|
|
"Date": now,
|
|
"Digest": digest,
|
|
"Signature": make_signature(sender, destination, now, digest),
|
|
"Content-Type": "application/activity+json; charset=utf-8",
|
|
"User-Agent": USER_AGENT,
|
|
},
|
|
)
|
|
if not response.ok:
|
|
response.raise_for_status()
|
|
return response
|
|
|
|
|
|
# pylint: disable=unused-argument
|
|
def to_ordered_collection_page(
|
|
queryset, remote_id, id_only=False, page=1, pure=False, **kwargs
|
|
):
|
|
""" serialize and pagiante a queryset """
|
|
paginated = Paginator(queryset, PAGE_LENGTH)
|
|
|
|
activity_page = paginated.page(page)
|
|
if id_only:
|
|
items = [s.remote_id for s in activity_page.object_list]
|
|
else:
|
|
items = [s.to_activity(pure=pure) for s in activity_page.object_list]
|
|
|
|
prev_page = next_page = None
|
|
if activity_page.has_next():
|
|
next_page = "%s?page=%d" % (remote_id, activity_page.next_page_number())
|
|
if activity_page.has_previous():
|
|
prev_page = "%s?page=%d" % (remote_id, activity_page.previous_page_number())
|
|
return activitypub.OrderedCollectionPage(
|
|
id="%s?page=%s" % (remote_id, page),
|
|
partOf=remote_id,
|
|
orderedItems=items,
|
|
next=next_page,
|
|
prev=prev_page,
|
|
)
|