forked from mirrors/bookwyrm
449 lines
15 KiB
Python
449 lines
15 KiB
Python
""" models for storing different kinds of Activities """
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from dataclasses import MISSING
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import re
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from django.apps import apps
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from django.core.cache import cache
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from django.core.exceptions import PermissionDenied
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from django.core.validators import MaxValueValidator, MinValueValidator
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from django.db import models
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from django.db.models import Q
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from django.dispatch import receiver
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from django.template.loader import get_template
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from django.utils import timezone
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from model_utils import FieldTracker
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from model_utils.managers import InheritanceManager
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from bookwyrm import activitypub
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from bookwyrm.preview_images import generate_edition_preview_image_task
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from bookwyrm.settings import ENABLE_PREVIEW_IMAGES
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from .activitypub_mixin import ActivitypubMixin, ActivityMixin
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from .activitypub_mixin import OrderedCollectionPageMixin
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from .base_model import BookWyrmModel
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from .readthrough import ProgressMode
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from . import fields
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class Status(OrderedCollectionPageMixin, BookWyrmModel):
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"""any post, like a reply to a review, etc"""
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user = fields.ForeignKey(
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"User", on_delete=models.PROTECT, activitypub_field="attributedTo"
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)
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content = fields.HtmlField(blank=True, null=True)
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raw_content = models.TextField(blank=True, null=True)
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mention_users = fields.TagField("User", related_name="mention_user")
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mention_books = fields.TagField("Edition", related_name="mention_book")
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local = models.BooleanField(default=True)
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content_warning = fields.CharField(
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max_length=500, blank=True, null=True, activitypub_field="summary"
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)
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privacy = fields.PrivacyField(max_length=255)
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sensitive = fields.BooleanField(default=False)
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# created date is different than publish date because of federated posts
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published_date = fields.DateTimeField(
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default=timezone.now, activitypub_field="published"
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)
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edited_date = fields.DateTimeField(
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blank=True, null=True, activitypub_field="updated"
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)
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deleted = models.BooleanField(default=False)
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deleted_date = models.DateTimeField(blank=True, null=True)
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favorites = models.ManyToManyField(
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"User",
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symmetrical=False,
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through="Favorite",
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through_fields=("status", "user"),
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related_name="user_favorites",
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)
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reply_parent = fields.ForeignKey(
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"self",
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null=True,
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on_delete=models.PROTECT,
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activitypub_field="inReplyTo",
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)
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thread_id = models.IntegerField(blank=True, null=True)
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objects = InheritanceManager()
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activity_serializer = activitypub.Note
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serialize_reverse_fields = [("attachments", "attachment", "id")]
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deserialize_reverse_fields = [("attachments", "attachment")]
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class Meta:
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"""default sorting"""
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ordering = ("-published_date",)
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def save(self, *args, **kwargs):
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"""save and notify"""
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if self.reply_parent:
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self.thread_id = self.reply_parent.thread_id or self.reply_parent.id
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super().save(*args, **kwargs)
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if not self.reply_parent:
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self.thread_id = self.id
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super().save(broadcast=False, update_fields=["thread_id"])
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def delete(self, *args, **kwargs): # pylint: disable=unused-argument
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""" "delete" a status"""
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if hasattr(self, "boosted_status"):
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# okay but if it's a boost really delete it
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super().delete(*args, **kwargs)
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return
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self.deleted = True
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# clear user content
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self.content = None
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if hasattr(self, "quotation"):
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self.quotation = None # pylint: disable=attribute-defined-outside-init
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self.deleted_date = timezone.now()
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self.save()
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@property
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def recipients(self):
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"""tagged users who definitely need to get this status in broadcast"""
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mentions = [u for u in self.mention_users.all() if not u.local]
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if (
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hasattr(self, "reply_parent")
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and self.reply_parent
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and not self.reply_parent.user.local
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):
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mentions.append(self.reply_parent.user)
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return list(set(mentions))
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@classmethod
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def ignore_activity(cls, activity): # pylint: disable=too-many-return-statements
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"""keep notes if they are replies to existing statuses"""
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if activity.type == "Announce":
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try:
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boosted = activitypub.resolve_remote_id(
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activity.object, get_activity=True
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)
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except activitypub.ActivitySerializerError:
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# if we can't load the status, definitely ignore it
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return True
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# keep the boost if we would keep the status
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return cls.ignore_activity(boosted)
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# keep if it if it's a custom type
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if activity.type != "Note":
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return False
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# keep it if it's a reply to an existing status
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if cls.objects.filter(remote_id=activity.inReplyTo).exists():
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return False
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# keep notes if they mention local users
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if activity.tag == MISSING or activity.tag is None:
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return True
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tags = [l["href"] for l in activity.tag if l["type"] == "Mention"]
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user_model = apps.get_model("bookwyrm.User", require_ready=True)
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for tag in tags:
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if user_model.objects.filter(remote_id=tag, local=True).exists():
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# we found a mention of a known use boost
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return False
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return True
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@classmethod
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def replies(cls, status):
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"""load all replies to a status. idk if there's a better way
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to write this so it's just a property"""
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return (
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cls.objects.filter(reply_parent=status)
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.select_subclasses()
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.order_by("published_date")
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)
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@property
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def status_type(self):
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"""expose the type of status for the ui using activity type"""
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return self.activity_serializer.__name__
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@property
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def boostable(self):
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"""you can't boost dms"""
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return self.privacy in ["unlisted", "public"]
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def to_replies(self, **kwargs):
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"""helper function for loading AP serialized replies to a status"""
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return self.to_ordered_collection(
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self.replies(self),
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remote_id=f"{self.remote_id}/replies",
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collection_only=True,
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**kwargs,
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).serialize()
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def to_activity_dataclass(self, pure=False): # pylint: disable=arguments-differ
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"""return tombstone if the status is deleted"""
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if self.deleted:
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return activitypub.Tombstone(
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id=self.remote_id,
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url=self.remote_id,
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deleted=self.deleted_date.isoformat(),
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published=self.deleted_date.isoformat(),
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)
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activity = ActivitypubMixin.to_activity_dataclass(self)
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activity.replies = self.to_replies()
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# "pure" serialization for non-bookwyrm instances
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if pure and hasattr(self, "pure_content"):
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activity.content = self.pure_content
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if hasattr(activity, "name"):
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activity.name = self.pure_name
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activity.type = self.pure_type
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book = getattr(self, "book", None)
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books = [book] if book else []
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books += list(self.mention_books.all())
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if len(books) == 1 and getattr(books[0], "preview_image", None):
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covers = [
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activitypub.Document(
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url=fields.get_absolute_url(books[0].preview_image),
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name=books[0].alt_text,
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)
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]
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else:
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covers = [
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activitypub.Document(
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url=fields.get_absolute_url(b.cover),
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name=b.alt_text,
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)
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for b in books
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if b and b.cover
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]
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activity.attachment = covers
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return activity
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def to_activity(self, pure=False): # pylint: disable=arguments-differ
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"""json serialized activitypub class"""
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return self.to_activity_dataclass(pure=pure).serialize()
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def raise_not_editable(self, viewer):
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"""certain types of status aren't editable"""
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# first, the standard raise
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super().raise_not_editable(viewer)
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if isinstance(self, (GeneratedNote, ReviewRating)):
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raise PermissionDenied()
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@classmethod
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def privacy_filter(cls, viewer, privacy_levels=None):
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queryset = super().privacy_filter(viewer, privacy_levels=privacy_levels)
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return queryset.filter(deleted=False, user__is_active=True)
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@classmethod
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def direct_filter(cls, queryset, viewer):
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"""Overridden filter for "direct" privacy level"""
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return queryset.exclude(
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~Q(Q(user=viewer) | Q(mention_users=viewer)), privacy="direct"
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)
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@classmethod
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def followers_filter(cls, queryset, viewer):
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"""Override-able filter for "followers" privacy level"""
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return queryset.exclude(
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~Q( # not yourself, a follower, or someone who is tagged
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Q(user__followers=viewer) | Q(user=viewer) | Q(mention_users=viewer)
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),
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privacy="followers", # and the status is followers only
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)
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class GeneratedNote(Status):
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"""these are app-generated messages about user activity"""
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@property
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def pure_content(self):
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"""indicate the book in question for mastodon (or w/e) users"""
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message = self.content
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books = ", ".join(
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f'<a href="{book.remote_id}">"{book.title}"</a>'
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for book in self.mention_books.all()
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)
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return f"{self.user.display_name} {message} {books}"
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activity_serializer = activitypub.GeneratedNote
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pure_type = "Note"
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ReadingStatusChoices = models.TextChoices(
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"ReadingStatusChoices", ["to-read", "reading", "read"]
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)
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class BookStatus(Status):
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"""Shared fields for comments, quotes, reviews"""
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book = fields.ForeignKey(
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"Edition", on_delete=models.PROTECT, activitypub_field="inReplyToBook"
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)
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pure_type = "Note"
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reading_status = fields.CharField(
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max_length=255, choices=ReadingStatusChoices.choices, null=True, blank=True
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)
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class Meta:
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"""not a real model, sorry"""
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abstract = True
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class Comment(BookStatus):
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"""like a review but without a rating and transient"""
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# this is it's own field instead of a foreign key to the progress update
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# so that the update can be deleted without impacting the status
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progress = models.IntegerField(
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validators=[MinValueValidator(0)], null=True, blank=True
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)
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progress_mode = models.CharField(
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max_length=3,
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choices=ProgressMode.choices,
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default=ProgressMode.PAGE,
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null=True,
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blank=True,
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)
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@property
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def pure_content(self):
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"""indicate the book in question for mastodon (or w/e) users"""
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return (
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f'{self.content}<p>(comment on <a href="{self.book.remote_id}">'
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f'"{self.book.title}"</a>)</p>'
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)
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activity_serializer = activitypub.Comment
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class Quotation(BookStatus):
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"""like a review but without a rating and transient"""
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quote = fields.HtmlField()
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raw_quote = models.TextField(blank=True, null=True)
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position = models.IntegerField(
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validators=[MinValueValidator(0)], null=True, blank=True
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)
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position_mode = models.CharField(
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max_length=3,
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choices=ProgressMode.choices,
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default=ProgressMode.PAGE,
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null=True,
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blank=True,
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)
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@property
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def pure_content(self):
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"""indicate the book in question for mastodon (or w/e) users"""
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quote = re.sub(r"^<p>", '<p>"', self.quote)
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quote = re.sub(r"</p>$", '"</p>', quote)
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return (
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f'{quote} <p>-- <a href="{self.book.remote_id}">'
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f'"{self.book.title}"</a></p>{self.content}'
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)
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activity_serializer = activitypub.Quotation
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class Review(BookStatus):
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"""a book review"""
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name = fields.CharField(max_length=255, null=True)
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rating = fields.DecimalField(
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default=None,
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null=True,
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blank=True,
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validators=[MinValueValidator(1), MaxValueValidator(5)],
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decimal_places=2,
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max_digits=3,
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)
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field_tracker = FieldTracker(fields=["rating"])
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@property
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def pure_name(self):
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"""clarify review names for mastodon serialization"""
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template = get_template("snippets/generated_status/review_pure_name.html")
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return template.render(
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{"book": self.book, "rating": self.rating, "name": self.name}
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).strip()
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@property
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def pure_content(self):
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"""indicate the book in question for mastodon (or w/e) users"""
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return self.content
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activity_serializer = activitypub.Review
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pure_type = "Article"
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def save(self, *args, **kwargs):
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"""clear rating caches"""
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if self.book.parent_work:
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cache.delete(f"book-rating-{self.book.parent_work.id}-*")
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super().save(*args, **kwargs)
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class ReviewRating(Review):
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"""a subtype of review that only contains a rating"""
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def save(self, *args, **kwargs):
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if not self.rating:
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raise ValueError("ReviewRating object must include a numerical rating")
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return super().save(*args, **kwargs)
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@property
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def pure_content(self):
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template = get_template("snippets/generated_status/rating.html")
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return template.render({"book": self.book, "rating": self.rating}).strip()
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activity_serializer = activitypub.Rating
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pure_type = "Note"
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class Boost(ActivityMixin, Status):
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"""boost'ing a post"""
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boosted_status = fields.ForeignKey(
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"Status",
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on_delete=models.PROTECT,
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related_name="boosters",
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activitypub_field="object",
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)
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activity_serializer = activitypub.Announce
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def save(self, *args, **kwargs):
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"""save and notify"""
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# This constraint can't work as it would cross tables.
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# class Meta:
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# unique_together = ('user', 'boosted_status')
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if (
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Boost.objects.filter(boosted_status=self.boosted_status, user=self.user)
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.exclude(id=self.id)
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.exists()
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):
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return
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super().save(*args, **kwargs)
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def __init__(self, *args, **kwargs):
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"""the user field is "actor" here instead of "attributedTo" """
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super().__init__(*args, **kwargs)
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reserve_fields = ["user", "boosted_status", "published_date", "privacy"]
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self.simple_fields = [f for f in self.simple_fields if f.name in reserve_fields]
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self.activity_fields = self.simple_fields
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self.many_to_many_fields = []
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self.image_fields = []
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self.deserialize_reverse_fields = []
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# pylint: disable=unused-argument
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@receiver(models.signals.post_save)
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def preview_image(instance, sender, *args, **kwargs):
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"""Updates book previews if the rating has changed"""
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if not ENABLE_PREVIEW_IMAGES or sender not in (Review, ReviewRating):
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return
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changed_fields = instance.field_tracker.changed()
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if len(changed_fields) > 0:
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edition = instance.book
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generate_edition_preview_image_task.delay(edition.id)
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