moviewyrm/bookwyrm/models/fields.py

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""" activitypub-aware django model fields """
from dataclasses import MISSING
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import re
from uuid import uuid4
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import dateutil.parser
from dateutil.parser import ParserError
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from django.contrib.postgres.fields import ArrayField as DjangoArrayField
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from django.core.exceptions import ValidationError
from django.core.files.base import ContentFile
from django.db import models
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from django.utils import timezone
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from django.utils.translation import gettext_lazy as _
from bookwyrm import activitypub
from bookwyrm.connectors import get_image
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from bookwyrm.sanitize_html import InputHtmlParser
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from bookwyrm.settings import DOMAIN
def validate_remote_id(value):
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""" make sure the remote_id looks like a url """
if not value or not re.match(r"^http.?:\/\/[^\s]+$", value):
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raise ValidationError(
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_("%(value)s is not a valid remote_id"),
params={"value": value},
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)
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def validate_localname(value):
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""" make sure localnames look okay """
if not re.match(r"^[A-Za-z\-_\.0-9]+$", value):
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raise ValidationError(
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_("%(value)s is not a valid username"),
params={"value": value},
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)
def validate_username(value):
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""" make sure usernames look okay """
if not re.match(r"^[A-Za-z\-_\.0-9]+@[A-Za-z\-_\.0-9]+\.[a-z]{2,}$", value):
raise ValidationError(
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_("%(value)s is not a valid username"),
params={"value": value},
)
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class ActivitypubFieldMixin:
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""" make a database field serializable """
def __init__(
self,
*args,
activitypub_field=None,
activitypub_wrapper=None,
deduplication_field=False,
**kwargs
):
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self.deduplication_field = deduplication_field
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if activitypub_wrapper:
self.activitypub_wrapper = activitypub_field
self.activitypub_field = activitypub_wrapper
else:
self.activitypub_field = activitypub_field
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super().__init__(*args, **kwargs)
def set_field_from_activity(self, instance, data):
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""" helper function for assinging a value to the field """
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try:
value = getattr(data, self.get_activitypub_field())
except AttributeError:
# masssively hack-y workaround for boosts
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if self.get_activitypub_field() != "attributedTo":
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raise
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value = getattr(data, "actor")
formatted = self.field_from_activity(value)
if formatted is None or formatted is MISSING or formatted == {}:
return
setattr(instance, self.name, formatted)
def set_activity_from_field(self, activity, instance):
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""" update the json object """
value = getattr(instance, self.name)
formatted = self.field_to_activity(value)
if formatted is None:
return
key = self.get_activitypub_field()
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# TODO: surely there's a better way
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if instance.__class__.__name__ == "Boost" and key == "attributedTo":
key = "actor"
if isinstance(activity.get(key), list):
activity[key] += formatted
else:
activity[key] = formatted
def field_to_activity(self, value):
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""" formatter to convert a model value into activitypub """
if hasattr(self, "activitypub_wrapper"):
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return {self.activitypub_wrapper: value}
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return value
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def field_from_activity(self, value):
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""" formatter to convert activitypub into a model value """
if value and hasattr(self, "activitypub_wrapper"):
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value = value.get(self.activitypub_wrapper)
return value
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def get_activitypub_field(self):
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""" model_field_name to activitypubFieldName """
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if self.activitypub_field:
return self.activitypub_field
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name = self.name.split(".")[-1]
components = name.split("_")
return components[0] + "".join(x.title() for x in components[1:])
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class ActivitypubRelatedFieldMixin(ActivitypubFieldMixin):
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""" default (de)serialization for foreign key and one to one """
def __init__(self, *args, load_remote=True, **kwargs):
self.load_remote = load_remote
super().__init__(*args, **kwargs)
def field_from_activity(self, value):
if not value:
return None
related_model = self.related_model
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if hasattr(value, "id") and value.id:
if not self.load_remote:
# only look in the local database
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return related_model.find_existing(value.serialize())
# this is an activitypub object, which we can deserialize
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return value.to_model(model=related_model)
try:
# make sure the value looks like a remote id
validate_remote_id(value)
except ValidationError:
# we don't know what this is, ignore it
return None
# gets or creates the model field from the remote id
if not self.load_remote:
# only look in the local database
return related_model.find_existing_by_remote_id(value)
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return activitypub.resolve_remote_id(value, model=related_model)
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class RemoteIdField(ActivitypubFieldMixin, models.CharField):
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""" a url that serves as a unique identifier """
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def __init__(self, *args, max_length=255, validators=None, **kwargs):
validators = validators or [validate_remote_id]
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super().__init__(*args, max_length=max_length, validators=validators, **kwargs)
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# for this field, the default is true. false everywhere else.
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self.deduplication_field = kwargs.get("deduplication_field", True)
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class UsernameField(ActivitypubFieldMixin, models.CharField):
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""" activitypub-aware username field """
def __init__(self, activitypub_field="preferredUsername", **kwargs):
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self.activitypub_field = activitypub_field
# I don't totally know why pylint is mad at this, but it makes it work
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super(ActivitypubFieldMixin, self).__init__( # pylint: disable=bad-super-call
_("username"),
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max_length=150,
unique=True,
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validators=[validate_username],
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error_messages={
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"unique": _("A user with that username already exists."),
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},
)
def deconstruct(self):
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""" implementation of models.Field deconstruct """
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name, path, args, kwargs = super().deconstruct()
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del kwargs["verbose_name"]
del kwargs["max_length"]
del kwargs["unique"]
del kwargs["validators"]
del kwargs["error_messages"]
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return name, path, args, kwargs
def field_to_activity(self, value):
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return value.split("@")[0]
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PrivacyLevels = models.TextChoices(
"Privacy", ["public", "unlisted", "followers", "direct"]
)
class PrivacyField(ActivitypubFieldMixin, models.CharField):
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""" this maps to two differente activitypub fields """
public = "https://www.w3.org/ns/activitystreams#Public"
def __init__(self, *args, **kwargs):
super().__init__(
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*args, max_length=255, choices=PrivacyLevels.choices, default="public"
)
def set_field_from_activity(self, instance, data):
to = data.to
cc = data.cc
if to == [self.public]:
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setattr(instance, self.name, "public")
elif cc == []:
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setattr(instance, self.name, "direct")
elif self.public in cc:
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setattr(instance, self.name, "unlisted")
else:
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setattr(instance, self.name, "followers")
def set_activity_from_field(self, activity, instance):
# explicitly to anyone mentioned (statuses only)
mentions = []
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if hasattr(instance, "mention_users"):
mentions = [u.remote_id for u in instance.mention_users.all()]
# this is a link to the followers list
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followers = instance.user.__class__._meta.get_field(
"followers"
).field_to_activity(instance.user.followers)
if instance.privacy == "public":
activity["to"] = [self.public]
activity["cc"] = [followers] + mentions
elif instance.privacy == "unlisted":
activity["to"] = [followers]
activity["cc"] = [self.public] + mentions
elif instance.privacy == "followers":
activity["to"] = [followers]
activity["cc"] = mentions
if instance.privacy == "direct":
activity["to"] = mentions
activity["cc"] = []
class ForeignKey(ActivitypubRelatedFieldMixin, models.ForeignKey):
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""" activitypub-aware foreign key field """
def field_to_activity(self, value):
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if not value:
return None
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return value.remote_id
class OneToOneField(ActivitypubRelatedFieldMixin, models.OneToOneField):
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""" activitypub-aware foreign key field """
def field_to_activity(self, value):
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if not value:
return None
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return value.to_activity()
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class ManyToManyField(ActivitypubFieldMixin, models.ManyToManyField):
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""" activitypub-aware many to many field """
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def __init__(self, *args, link_only=False, **kwargs):
self.link_only = link_only
super().__init__(*args, **kwargs)
def set_field_from_activity(self, instance, data):
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""" helper function for assinging a value to the field """
value = getattr(data, self.get_activitypub_field())
formatted = self.field_from_activity(value)
if formatted is None or formatted is MISSING:
return
getattr(instance, self.name).set(formatted)
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instance.save(broadcast=False)
def field_to_activity(self, value):
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if self.link_only:
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return "%s/%s" % (value.instance.remote_id, self.name)
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return [i.remote_id for i in value.all()]
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def field_from_activity(self, value):
items = []
if value is None or value is MISSING:
return []
for remote_id in value:
try:
validate_remote_id(remote_id)
except ValidationError:
continue
items.append(
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activitypub.resolve_remote_id(remote_id, model=self.related_model)
)
return items
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class TagField(ManyToManyField):
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""" special case of many to many that uses Tags """
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def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
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self.activitypub_field = "tag"
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def field_to_activity(self, value):
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tags = []
for item in value.all():
activity_type = item.__class__.__name__
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if activity_type == "User":
activity_type = "Mention"
tags.append(
activitypub.Link(
href=item.remote_id,
name=getattr(item, item.name_field),
type=activity_type,
)
)
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return tags
def field_from_activity(self, value):
if not isinstance(value, list):
return None
items = []
for link_json in value:
link = activitypub.Link(**link_json)
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tag_type = link.type if link.type != "Mention" else "Person"
if tag_type == "Book":
tag_type = "Edition"
if tag_type != self.related_model.activity_serializer.type:
# tags can contain multiple types
continue
items.append(
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activitypub.resolve_remote_id(link.href, model=self.related_model)
)
return items
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def image_serializer(value, alt):
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""" helper for serializing images """
if value and hasattr(value, "url"):
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url = value.url
else:
return None
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url = "https://%s%s" % (DOMAIN, url)
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return activitypub.Image(url=url, name=alt)
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class ImageField(ActivitypubFieldMixin, models.ImageField):
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""" activitypub-aware image field """
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def __init__(self, *args, alt_field=None, **kwargs):
self.alt_field = alt_field
super().__init__(*args, **kwargs)
# pylint: disable=arguments-differ
def set_field_from_activity(self, instance, data, save=True):
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""" helper function for assinging a value to the field """
value = getattr(data, self.get_activitypub_field())
formatted = self.field_from_activity(value)
if formatted is None or formatted is MISSING:
return
getattr(instance, self.name).save(*formatted, save=save)
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def set_activity_from_field(self, activity, instance):
value = getattr(instance, self.name)
if value is None:
return
alt_text = getattr(instance, self.alt_field)
formatted = self.field_to_activity(value, alt_text)
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key = self.get_activitypub_field()
activity[key] = formatted
def field_to_activity(self, value, alt=None):
return image_serializer(value, alt)
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def field_from_activity(self, value):
image_slug = value
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# when it's an inline image (User avatar/icon, Book cover), it's a json
# blob, but when it's an attached image, it's just a url
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if hasattr(image_slug, "url"):
url = image_slug.url
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elif isinstance(image_slug, str):
url = image_slug
else:
return None
try:
validate_remote_id(url)
except ValidationError:
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return None
response = get_image(url)
if not response:
return None
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image_name = str(uuid4()) + "." + url.split(".")[-1]
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image_content = ContentFile(response.content)
return [image_name, image_content]
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class DateTimeField(ActivitypubFieldMixin, models.DateTimeField):
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""" activitypub-aware datetime field """
def field_to_activity(self, value):
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if not value:
return None
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return value.isoformat()
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def field_from_activity(self, value):
try:
date_value = dateutil.parser.parse(value)
try:
return timezone.make_aware(date_value)
except ValueError:
return date_value
except (ParserError, TypeError):
return None
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class HtmlField(ActivitypubFieldMixin, models.TextField):
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""" a text field for storing html """
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def field_from_activity(self, value):
if not value or value == MISSING:
return None
sanitizer = InputHtmlParser()
sanitizer.feed(value)
return sanitizer.get_output()
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class ArrayField(ActivitypubFieldMixin, DjangoArrayField):
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""" activitypub-aware array field """
def field_to_activity(self, value):
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return [str(i) for i in value]
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class CharField(ActivitypubFieldMixin, models.CharField):
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""" activitypub-aware char field """
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class TextField(ActivitypubFieldMixin, models.TextField):
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""" activitypub-aware text field """
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class BooleanField(ActivitypubFieldMixin, models.BooleanField):
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""" activitypub-aware boolean field """
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class IntegerField(ActivitypubFieldMixin, models.IntegerField):
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""" activitypub-aware boolean field """
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class DecimalField(ActivitypubFieldMixin, models.DecimalField):
""" activitypub-aware boolean field """
def field_to_activity(self, value):
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if not value:
return None
return float(value)