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cleans up ordered collection mixin

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This commit is contained in:
Mouse Reeve 2020-11-30 19:01:43 -08:00
parent 1ec2f20486
commit eb6206252d
4 changed files with 59 additions and 114 deletions
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126
bookwyrm/models/base_model.py
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@ -1,18 +1,16 @@
''' base model with default fields '''
from base64 import b64encode
from dataclasses import dataclass
from typing import Callable
from uuid import uuid4
from urllib.parse import urlencode
from Crypto.PublicKey import RSA
from Crypto.Signature import pkcs1_15
from Crypto.Hash import SHA256
from django.core.paginator import Paginator
from django.db import models
from django.dispatch import receiver
from bookwyrm import activitypub
from bookwyrm.settings import DOMAIN
from bookwyrm.settings import DOMAIN, PAGE_LENGTH
from .fields import RemoteIdField
@ -52,15 +50,6 @@ def execute_after_save(sender, instance, created, *args, **kwargs):
instance.save()
def get_field_name(field):
''' model_field_name to activitypubFieldName '''
if field.activitypub_field:
return field.activitypub_field
name = field.name.split('.')[-1]
components = name.split('_')
return components[0] + ''.join(x.title() for x in components[1:])
def unfurl_related_field(related_field):
''' load reverse lookups (like public key owner or Status attachment '''
if hasattr(related_field, 'all'):
@ -78,15 +67,16 @@ class ActivitypubMixin:
def to_activity(self):
''' convert from a model to an activity '''
activity = {}
for field in self.__class__._meta.get_fields():
for field in self._meta.get_fields():
if not hasattr(field, 'field_to_activity'):
continue
key = get_field_name(field)
value = field.field_to_activity(getattr(self, field.name))
if value is None:
continue
key = field.get_activitypub_field()
if key in activity and isinstance(activity[key], list):
# handles tags on status, which accumulate across fields
activity[key] += value
else:
activity[key] = value
@ -125,15 +115,12 @@ class ActivitypubMixin:
def to_delete_activity(self, user):
''' notice of deletion '''
# this should be a tombstone
activity_object = self.to_activity()
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=activity_object,
object=self.to_activity(),
).serialize()
@ -165,81 +152,53 @@ class OrderedCollectionPageMixin(ActivitypubMixin):
''' this can be overriden if there's a special remote id, ie outbox '''
return self.remote_id
def page(self, min_id=None, max_id=None):
''' helper function to create the pagination url '''
params = {'page': 'true'}
if min_id:
params['min_id'] = min_id
if max_id:
params['max_id'] = max_id
return '?%s' % urlencode(params)
def next_page(self, items):
''' use the max id of the last item '''
if not items.count():
return ''
return self.page(max_id=items[items.count() - 1].id)
def prev_page(self, items):
''' use the min id of the first item '''
if not items.count():
return ''
return self.page(min_id=items[0].id)
def to_ordered_collection_page(self, queryset, remote_id, \
id_only=False, min_id=None, max_id=None):
''' serialize and pagiante a queryset '''
# TODO: weird place to define this
limit = 20
# filters for use in the django queryset min/max
filters = {}
if min_id is not None:
filters['id__gt'] = min_id
if max_id is not None:
filters['id__lte'] = max_id
page_id = self.page(min_id=min_id, max_id=max_id)
items = queryset.filter(
**filters
).all()[:limit]
if id_only:
page = [s.remote_id for s in items]
else:
page = [s.to_activity() for s in items]
return activitypub.OrderedCollectionPage(
id='%s%s' % (remote_id, page_id),
partOf=remote_id,
orderedItems=page,
next='%s%s' % (remote_id, self.next_page(items)),
prev='%s%s' % (remote_id, self.prev_page(items))
).serialize()
def to_ordered_collection(self, queryset, \
remote_id=None, page=False, **kwargs):
''' an ordered collection of whatevers '''
remote_id = remote_id or self.remote_id
if page:
return self.to_ordered_collection_page(
return to_ordered_collection_page(
queryset, remote_id, **kwargs)
name = ''
if hasattr(self, 'name'):
name = self.name
owner = ''
if hasattr(self, 'user'):
owner = self.user.remote_id
name = self.name if hasattr(self, 'name') else None
owner = self.user.remote_id if hasattr(self, 'user') else ''
size = queryset.count()
paginated = Paginator(queryset, PAGE_LENGTH)
return activitypub.OrderedCollection(
id=remote_id,
totalItems=size,
totalItems=paginated.count,
name=name,
owner=owner,
first='%s%s' % (remote_id, self.page()),
last='%s%s' % (remote_id, self.page(min_id=0))
first='%s?page=1' % remote_id,
last='%s?page=%d' % (remote_id, paginated.num_pages)
).serialize()
def to_ordered_collection_page(queryset, remote_id, id_only=False, page=1):
''' 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() 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
).serialize()
class OrderedCollectionMixin(OrderedCollectionPageMixin):
''' extends activitypub models to work as ordered collections '''
@property
@ -252,12 +211,3 @@ class OrderedCollectionMixin(OrderedCollectionPageMixin):
def to_activity(self, **kwargs):
''' an ordered collection of the specified model queryset '''
return self.to_ordered_collection(self.collection_queryset, **kwargs)
@dataclass(frozen=True)
class ActivityMapping:
''' translate between an activitypub json field and a model field '''
activity_key: str
model_key: str
activity_formatter: Callable = lambda x: x
model_formatter: Callable = lambda x: x