mirror of
https://github.com/bookwyrm-social/bookwyrm.git
synced 2024-05-16 07:23:04 +00:00
b37a4322de
These errors in resolve_remote_id aren't really errors, they're routine problems that we can expect from dealing with the outside world, like a connection timeout, a server being down, a server being blocked, et cetera. It's cluttering up the logs and causing unnecessary worry.
318 lines
11 KiB
Python
318 lines
11 KiB
Python
""" basics for an activitypub serializer """
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from dataclasses import dataclass, fields, MISSING
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from json import JSONEncoder
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import logging
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from django.apps import apps
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from django.db import IntegrityError, transaction
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from bookwyrm.connectors import ConnectorException, get_data
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from bookwyrm.tasks import app, MEDIUM
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logger = logging.getLogger(__name__)
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class ActivitySerializerError(ValueError):
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"""routine problems serializing activitypub json"""
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class ActivityEncoder(JSONEncoder):
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"""used to convert an Activity object into json"""
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def default(self, o):
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return o.__dict__
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@dataclass
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# pylint: disable=invalid-name
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class Signature:
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"""public key block"""
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creator: str
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created: str
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signatureValue: str
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type: str = "RsaSignature2017"
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def naive_parse(activity_objects, activity_json, serializer=None):
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"""this navigates circular import issues by looking up models' serializers"""
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if not serializer:
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if activity_json.get("publicKeyPem"):
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# ugh
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activity_json["type"] = "PublicKey"
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activity_type = activity_json.get("type")
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if activity_type in ["Question", "Article"]:
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return None
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try:
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serializer = activity_objects[activity_type]
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except KeyError as err:
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# we know this exists and that we can't handle it
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raise ActivitySerializerError(err)
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return serializer(activity_objects=activity_objects, **activity_json)
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@dataclass(init=False)
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class ActivityObject:
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"""actor activitypub json"""
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id: str
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type: str
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def __init__(self, activity_objects=None, **kwargs):
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"""this lets you pass in an object with fields that aren't in the
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dataclass, which it ignores. Any field in the dataclass is required or
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has a default value"""
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for field in fields(self):
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try:
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value = kwargs[field.name]
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if value in (None, MISSING, {}):
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raise KeyError("Missing required field", field.name)
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try:
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is_subclass = issubclass(field.type, ActivityObject)
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except TypeError:
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is_subclass = False
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# serialize a model obj
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if hasattr(value, "to_activity"):
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value = value.to_activity()
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# parse a dict into the appropriate activity
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elif is_subclass and isinstance(value, dict):
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if activity_objects:
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value = naive_parse(activity_objects, value)
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else:
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value = naive_parse(
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activity_objects, value, serializer=field.type
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)
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except KeyError:
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if field.default == MISSING and field.default_factory == MISSING:
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raise ActivitySerializerError(
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f"Missing required field: {field.name}"
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)
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value = field.default
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setattr(self, field.name, value)
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# pylint: disable=too-many-locals,too-many-branches,too-many-arguments
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def to_model(
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self, model=None, instance=None, allow_create=True, save=True, overwrite=True
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):
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"""convert from an activity to a model instance"""
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model = model or get_model_from_type(self.type)
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# only reject statuses if we're potentially creating them
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if (
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allow_create
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and hasattr(model, "ignore_activity")
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and model.ignore_activity(self)
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):
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return None
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# check for an existing instance
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instance = instance or model.find_existing(self.serialize())
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if not instance and not allow_create:
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# so that we don't create when we want to delete or update
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return None
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instance = instance or model()
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# keep track of what we've changed
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update_fields = []
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# sets field on the model using the activity value
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for field in instance.simple_fields:
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try:
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changed = field.set_field_from_activity(
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instance, self, overwrite=overwrite
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)
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if changed:
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update_fields.append(field.name)
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except AttributeError as e:
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raise ActivitySerializerError(e)
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# image fields have to be set after other fields because they can save
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# too early and jank up users
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for field in instance.image_fields:
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changed = field.set_field_from_activity(
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instance, self, save=save, overwrite=overwrite
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)
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if changed:
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update_fields.append(field.name)
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if not save:
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return instance
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with transaction.atomic():
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# can't force an update on fields unless the object already exists in the db
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if not instance.id:
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update_fields = None
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# we can't set many to many and reverse fields on an unsaved object
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try:
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try:
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instance.save(broadcast=False, update_fields=update_fields)
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except TypeError:
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instance.save(update_fields=update_fields)
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except IntegrityError as e:
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raise ActivitySerializerError(e)
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# add many to many fields, which have to be set post-save
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for field in instance.many_to_many_fields:
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# mention books/users, for example
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field.set_field_from_activity(instance, self)
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# reversed relationships in the models
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for (
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model_field_name,
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activity_field_name,
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) in instance.deserialize_reverse_fields:
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# attachments on Status, for example
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values = getattr(self, activity_field_name)
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if values is None or values is MISSING:
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continue
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model_field = getattr(model, model_field_name)
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# creating a Work, model_field is 'editions'
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# creating a User, model field is 'key_pair'
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related_model = model_field.field.model
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related_field_name = model_field.field.name
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for item in values:
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set_related_field.delay(
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related_model.__name__,
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instance.__class__.__name__,
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related_field_name,
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instance.remote_id,
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item,
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)
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return instance
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def serialize(self, **kwargs):
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"""convert to dictionary with context attr"""
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omit = kwargs.get("omit", ())
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data = self.__dict__.copy()
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# recursively serialize
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for (k, v) in data.items():
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try:
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if issubclass(type(v), ActivityObject):
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data[k] = v.serialize()
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except TypeError:
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pass
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data = {k: v for (k, v) in data.items() if v is not None and k not in omit}
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if "@context" not in omit:
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data["@context"] = "https://www.w3.org/ns/activitystreams"
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return data
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@app.task(queue=MEDIUM)
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@transaction.atomic
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def set_related_field(
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model_name, origin_model_name, related_field_name, related_remote_id, data
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):
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"""load reverse related fields (editions, attachments) without blocking"""
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model = apps.get_model(f"bookwyrm.{model_name}", require_ready=True)
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origin_model = apps.get_model(f"bookwyrm.{origin_model_name}", require_ready=True)
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if isinstance(data, str):
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existing = model.find_existing_by_remote_id(data)
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if existing:
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data = existing.to_activity()
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else:
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data = get_data(data)
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activity = model.activity_serializer(**data)
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# this must exist because it's the object that triggered this function
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instance = origin_model.find_existing_by_remote_id(related_remote_id)
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if not instance:
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raise ValueError(f"Invalid related remote id: {related_remote_id}")
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# set the origin's remote id on the activity so it will be there when
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# the model instance is created
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# edition.parentWork = instance, for example
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model_field = getattr(model, related_field_name)
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if hasattr(model_field, "activitypub_field"):
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setattr(activity, getattr(model_field, "activitypub_field"), instance.remote_id)
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item = activity.to_model(model=model)
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# if the related field isn't serialized (attachments on Status), then
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# we have to set it post-creation
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if not hasattr(model_field, "activitypub_field"):
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setattr(item, related_field_name, instance)
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item.save()
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def get_model_from_type(activity_type):
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"""given the activity, what type of model"""
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models = apps.get_models()
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model = [
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m
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for m in models
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if hasattr(m, "activity_serializer")
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and hasattr(m.activity_serializer, "type")
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and m.activity_serializer.type == activity_type
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]
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if not model:
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raise ActivitySerializerError(
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f'No model found for activity type "{activity_type}"'
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)
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return model[0]
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def resolve_remote_id(
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remote_id, model=None, refresh=False, save=True, get_activity=False
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):
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"""take a remote_id and return an instance, creating if necessary"""
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if model: # a bonus check we can do if we already know the model
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if isinstance(model, str):
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model = apps.get_model(f"bookwyrm.{model}", require_ready=True)
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result = model.find_existing_by_remote_id(remote_id)
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if result and not refresh:
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return result if not get_activity else result.to_activity_dataclass()
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# load the data and create the object
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try:
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data = get_data(remote_id)
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except ConnectorException:
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logger.info("Could not connect to host for remote_id: %s", remote_id)
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return None
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# determine the model implicitly, if not provided
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# or if it's a model with subclasses like Status, check again
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if not model or hasattr(model.objects, "select_subclasses"):
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model = get_model_from_type(data.get("type"))
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# check for existing items with shared unique identifiers
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result = model.find_existing(data)
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if result and not refresh:
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return result if not get_activity else result.to_activity_dataclass()
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item = model.activity_serializer(**data)
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if get_activity:
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return item
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# if we're refreshing, "result" will be set and we'll update it
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return item.to_model(model=model, instance=result, save=save)
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@dataclass(init=False)
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class Link(ActivityObject):
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"""for tagging a book in a status"""
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href: str
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name: str = None
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mediaType: str = None
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id: str = None
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attributedTo: str = None
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availability: str = None
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type: str = "Link"
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def serialize(self, **kwargs):
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"""remove fields"""
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omit = ("id", "type", "@context")
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return super().serialize(omit=omit)
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@dataclass(init=False)
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class Mention(Link):
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"""a subtype of Link for mentioning an actor"""
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type: str = "Mention"
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