mirror of
https://github.com/bookwyrm-social/bookwyrm.git
synced 2024-12-15 20:56:34 +00:00
390 lines
13 KiB
Python
390 lines
13 KiB
Python
''' activitypub-aware django model fields '''
|
|
from dataclasses import MISSING
|
|
import re
|
|
from uuid import uuid4
|
|
|
|
import dateutil.parser
|
|
from dateutil.parser import ParserError
|
|
from django.contrib.postgres.fields import ArrayField as DjangoArrayField
|
|
from django.core.exceptions import ValidationError
|
|
from django.core.files.base import ContentFile
|
|
from django.db import models
|
|
from django.utils import timezone
|
|
from django.utils.translation import gettext_lazy as _
|
|
from bookwyrm import activitypub
|
|
from bookwyrm.sanitize_html import InputHtmlParser
|
|
from bookwyrm.settings import DOMAIN
|
|
from bookwyrm.connectors import get_image
|
|
|
|
|
|
def validate_remote_id(value):
|
|
''' make sure the remote_id looks like a url '''
|
|
if not value or not re.match(r'^http.?:\/\/[^\s]+$', value):
|
|
raise ValidationError(
|
|
_('%(value)s is not a valid remote_id'),
|
|
params={'value': value},
|
|
)
|
|
|
|
def validate_username(value):
|
|
''' make sure usernames look okay '''
|
|
if not re.match(r'^[A-Za-z\-_\.]+$', value):
|
|
raise ValidationError(
|
|
_('%(value)s is not a valid remote_id'),
|
|
params={'value': value},
|
|
)
|
|
|
|
|
|
class ActivitypubFieldMixin:
|
|
''' make a database field serializable '''
|
|
def __init__(self, *args, \
|
|
activitypub_field=None, activitypub_wrapper=None,
|
|
deduplication_field=False, **kwargs):
|
|
self.deduplication_field = deduplication_field
|
|
if activitypub_wrapper:
|
|
self.activitypub_wrapper = activitypub_field
|
|
self.activitypub_field = activitypub_wrapper
|
|
else:
|
|
self.activitypub_field = activitypub_field
|
|
super().__init__(*args, **kwargs)
|
|
|
|
|
|
def set_field_from_activity(self, instance, data):
|
|
''' helper function for assinging a value to the field '''
|
|
try:
|
|
value = getattr(data, self.get_activitypub_field())
|
|
except AttributeError:
|
|
# masssively hack-y workaround for boosts
|
|
if self.get_activitypub_field() != 'attributedTo':
|
|
raise
|
|
value = getattr(data, 'actor')
|
|
formatted = self.field_from_activity(value)
|
|
if formatted is None or formatted is MISSING:
|
|
return
|
|
setattr(instance, self.name, formatted)
|
|
|
|
|
|
def set_activity_from_field(self, activity, instance):
|
|
''' 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()
|
|
if isinstance(activity.get(key), list):
|
|
activity[key] += formatted
|
|
else:
|
|
activity[key] = formatted
|
|
|
|
|
|
def field_to_activity(self, value):
|
|
''' formatter to convert a model value into activitypub '''
|
|
if hasattr(self, 'activitypub_wrapper'):
|
|
return {self.activitypub_wrapper: value}
|
|
return value
|
|
|
|
def field_from_activity(self, value):
|
|
''' formatter to convert activitypub into a model value '''
|
|
if hasattr(self, 'activitypub_wrapper'):
|
|
value = value.get(self.activitypub_wrapper)
|
|
return value
|
|
|
|
def get_activitypub_field(self):
|
|
''' model_field_name to activitypubFieldName '''
|
|
if self.activitypub_field:
|
|
return self.activitypub_field
|
|
name = self.name.split('.')[-1]
|
|
components = name.split('_')
|
|
return components[0] + ''.join(x.title() for x in components[1:])
|
|
|
|
|
|
class ActivitypubRelatedFieldMixin(ActivitypubFieldMixin):
|
|
''' default (de)serialization for foreign key and one to one '''
|
|
def field_from_activity(self, value):
|
|
if not value:
|
|
return None
|
|
|
|
related_model = self.related_model
|
|
if isinstance(value, dict) and value.get('id'):
|
|
# this is an activitypub object, which we can deserialize
|
|
activity_serializer = related_model.activity_serializer
|
|
return activity_serializer(**value).to_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
|
|
return activitypub.resolve_remote_id(related_model, value)
|
|
|
|
|
|
class RemoteIdField(ActivitypubFieldMixin, models.CharField):
|
|
''' a url that serves as a unique identifier '''
|
|
def __init__(self, *args, max_length=255, validators=None, **kwargs):
|
|
validators = validators or [validate_remote_id]
|
|
super().__init__(
|
|
*args, max_length=max_length, validators=validators,
|
|
**kwargs
|
|
)
|
|
# for this field, the default is true. false everywhere else.
|
|
self.deduplication_field = kwargs.get('deduplication_field', True)
|
|
|
|
|
|
class UsernameField(ActivitypubFieldMixin, models.CharField):
|
|
''' activitypub-aware username field '''
|
|
def __init__(self, activitypub_field='preferredUsername'):
|
|
self.activitypub_field = activitypub_field
|
|
# I don't totally know why pylint is mad at this, but it makes it work
|
|
super( #pylint: disable=bad-super-call
|
|
ActivitypubFieldMixin, self
|
|
).__init__(
|
|
_('username'),
|
|
max_length=150,
|
|
unique=True,
|
|
validators=[validate_username],
|
|
error_messages={
|
|
'unique': _('A user with that username already exists.'),
|
|
},
|
|
)
|
|
|
|
def deconstruct(self):
|
|
''' implementation of models.Field deconstruct '''
|
|
name, path, args, kwargs = super().deconstruct()
|
|
del kwargs['verbose_name']
|
|
del kwargs['max_length']
|
|
del kwargs['unique']
|
|
del kwargs['validators']
|
|
del kwargs['error_messages']
|
|
return name, path, args, kwargs
|
|
|
|
def field_to_activity(self, value):
|
|
return value.split('@')[0]
|
|
|
|
|
|
PrivacyLevels = models.TextChoices('Privacy', [
|
|
'public',
|
|
'unlisted',
|
|
'followers',
|
|
'direct'
|
|
])
|
|
|
|
class PrivacyField(ActivitypubFieldMixin, models.CharField):
|
|
''' this maps to two differente activitypub fields '''
|
|
public = 'https://www.w3.org/ns/activitystreams#Public'
|
|
def __init__(self, *args, **kwargs):
|
|
super().__init__(
|
|
*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]:
|
|
setattr(instance, self.name, 'public')
|
|
elif cc == []:
|
|
setattr(instance, self.name, 'direct')
|
|
elif self.public in cc:
|
|
setattr(instance, self.name, 'unlisted')
|
|
else:
|
|
setattr(instance, self.name, 'followers')
|
|
|
|
def set_activity_from_field(self, activity, instance):
|
|
mentions = [u.remote_id for u in instance.mention_users.all()]
|
|
# this is a link to the followers list
|
|
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):
|
|
''' activitypub-aware foreign key field '''
|
|
def field_to_activity(self, value):
|
|
if not value:
|
|
return None
|
|
return value.remote_id
|
|
|
|
|
|
class OneToOneField(ActivitypubRelatedFieldMixin, models.OneToOneField):
|
|
''' activitypub-aware foreign key field '''
|
|
def field_to_activity(self, value):
|
|
if not value:
|
|
return None
|
|
return value.to_activity()
|
|
|
|
|
|
class ManyToManyField(ActivitypubFieldMixin, models.ManyToManyField):
|
|
''' activitypub-aware many to many field '''
|
|
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):
|
|
''' 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)
|
|
|
|
def field_to_activity(self, value):
|
|
if self.link_only:
|
|
return '%s/%s' % (value.instance.remote_id, self.name)
|
|
return [i.remote_id for i in value.all()]
|
|
|
|
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(
|
|
activitypub.resolve_remote_id(self.related_model, remote_id)
|
|
)
|
|
return items
|
|
|
|
|
|
class TagField(ManyToManyField):
|
|
''' special case of many to many that uses Tags '''
|
|
def __init__(self, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
self.activitypub_field = 'tag'
|
|
|
|
def field_to_activity(self, value):
|
|
tags = []
|
|
for item in value.all():
|
|
activity_type = item.__class__.__name__
|
|
if activity_type == 'User':
|
|
activity_type = 'Mention'
|
|
tags.append(activitypub.Link(
|
|
href=item.remote_id,
|
|
name=getattr(item, item.name_field),
|
|
type=activity_type
|
|
))
|
|
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)
|
|
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(
|
|
activitypub.resolve_remote_id(self.related_model, link.href)
|
|
)
|
|
return items
|
|
|
|
|
|
def image_serializer(value):
|
|
''' helper for serializing images '''
|
|
if value and hasattr(value, 'url'):
|
|
url = value.url
|
|
else:
|
|
return None
|
|
url = 'https://%s%s' % (DOMAIN, url)
|
|
return activitypub.Image(url=url)
|
|
|
|
|
|
class ImageField(ActivitypubFieldMixin, models.ImageField):
|
|
''' activitypub-aware image field '''
|
|
# pylint: disable=arguments-differ
|
|
def set_field_from_activity(self, instance, data, save=True):
|
|
''' 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)
|
|
|
|
|
|
def field_to_activity(self, value):
|
|
return image_serializer(value)
|
|
|
|
|
|
def field_from_activity(self, value):
|
|
image_slug = value
|
|
# 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
|
|
if isinstance(image_slug, dict):
|
|
url = image_slug.get('url')
|
|
elif isinstance(image_slug, str):
|
|
url = image_slug
|
|
else:
|
|
return None
|
|
|
|
try:
|
|
validate_remote_id(url)
|
|
except ValidationError:
|
|
return None
|
|
|
|
response = get_image(url)
|
|
if not response:
|
|
return None
|
|
|
|
image_name = str(uuid4()) + '.' + url.split('.')[-1]
|
|
image_content = ContentFile(response.content)
|
|
return [image_name, image_content]
|
|
|
|
|
|
class DateTimeField(ActivitypubFieldMixin, models.DateTimeField):
|
|
''' activitypub-aware datetime field '''
|
|
def field_to_activity(self, value):
|
|
if not value:
|
|
return None
|
|
return value.isoformat()
|
|
|
|
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
|
|
|
|
class HtmlField(ActivitypubFieldMixin, models.TextField):
|
|
''' a text field for storing html '''
|
|
def field_from_activity(self, value):
|
|
if not value or value == MISSING:
|
|
return None
|
|
sanitizer = InputHtmlParser()
|
|
sanitizer.feed(value)
|
|
return sanitizer.get_output()
|
|
|
|
class ArrayField(ActivitypubFieldMixin, DjangoArrayField):
|
|
''' activitypub-aware array field '''
|
|
def field_to_activity(self, value):
|
|
return [str(i) for i in value]
|
|
|
|
class CharField(ActivitypubFieldMixin, models.CharField):
|
|
''' activitypub-aware char field '''
|
|
|
|
class TextField(ActivitypubFieldMixin, models.TextField):
|
|
''' activitypub-aware text field '''
|
|
|
|
class BooleanField(ActivitypubFieldMixin, models.BooleanField):
|
|
''' activitypub-aware boolean field '''
|
|
|
|
class IntegerField(ActivitypubFieldMixin, models.IntegerField):
|
|
''' activitypub-aware boolean field '''
|