""" models for storing different kinds of Activities """ from dataclasses import MISSING import re from django.apps import apps from django.core.exceptions import PermissionDenied from django.core.validators import MaxValueValidator, MinValueValidator from django.db import models from django.dispatch import receiver from django.template.loader import get_template from django.utils import timezone from model_utils import FieldTracker from model_utils.managers import InheritanceManager from bookwyrm import activitypub from bookwyrm.preview_images import generate_edition_preview_image_task from bookwyrm.settings import ENABLE_PREVIEW_IMAGES from .activitypub_mixin import ActivitypubMixin, ActivityMixin from .activitypub_mixin import OrderedCollectionPageMixin from .base_model import BookWyrmModel from .fields import image_serializer from .readthrough import ProgressMode from . import fields class Status(OrderedCollectionPageMixin, BookWyrmModel): """any post, like a reply to a review, etc""" user = fields.ForeignKey( "User", on_delete=models.PROTECT, activitypub_field="attributedTo" ) content = fields.HtmlField(blank=True, null=True) mention_users = fields.TagField("User", related_name="mention_user") mention_books = fields.TagField("Edition", related_name="mention_book") local = models.BooleanField(default=True) content_warning = fields.CharField( max_length=500, blank=True, null=True, activitypub_field="summary" ) privacy = fields.PrivacyField(max_length=255) sensitive = fields.BooleanField(default=False) # created date is different than publish date because of federated posts published_date = fields.DateTimeField( default=timezone.now, activitypub_field="published" ) deleted = models.BooleanField(default=False) deleted_date = models.DateTimeField(blank=True, null=True) favorites = models.ManyToManyField( "User", symmetrical=False, through="Favorite", through_fields=("status", "user"), related_name="user_favorites", ) reply_parent = fields.ForeignKey( "self", null=True, on_delete=models.PROTECT, activitypub_field="inReplyTo", ) objects = InheritanceManager() activity_serializer = activitypub.Note serialize_reverse_fields = [("attachments", "attachment", "id")] deserialize_reverse_fields = [("attachments", "attachment")] class Meta: """default sorting""" ordering = ("-published_date",) def delete(self, *args, **kwargs): # pylint: disable=unused-argument """ "delete" a status""" if hasattr(self, "boosted_status"): # okay but if it's a boost really delete it super().delete(*args, **kwargs) return self.deleted = True # clear user content self.content = None if hasattr(self, "quotation"): self.quotation = None # pylint: disable=attribute-defined-outside-init self.deleted_date = timezone.now() self.save() @property def recipients(self): """tagged users who definitely need to get this status in broadcast""" mentions = [u for u in self.mention_users.all() if not u.local] if ( hasattr(self, "reply_parent") and self.reply_parent and not self.reply_parent.user.local ): mentions.append(self.reply_parent.user) return list(set(mentions)) @classmethod def ignore_activity(cls, activity): # pylint: disable=too-many-return-statements """keep notes if they are replies to existing statuses""" if activity.type == "Announce": try: boosted = activitypub.resolve_remote_id( activity.object, get_activity=True ) except activitypub.ActivitySerializerError: # if we can't load the status, definitely ignore it return True # keep the boost if we would keep the status return cls.ignore_activity(boosted) # keep if it if it's a custom type if activity.type != "Note": return False # keep it if it's a reply to an existing status if cls.objects.filter(remote_id=activity.inReplyTo).exists(): return False # keep notes if they mention local users if activity.tag == MISSING or activity.tag is None: return True tags = [l["href"] for l in activity.tag if l["type"] == "Mention"] user_model = apps.get_model("bookwyrm.User", require_ready=True) for tag in tags: if user_model.objects.filter(remote_id=tag, local=True).exists(): # we found a mention of a known use boost return False return True @classmethod def replies(cls, status): """load all replies to a status. idk if there's a better way to write this so it's just a property""" return ( cls.objects.filter(reply_parent=status) .select_subclasses() .order_by("published_date") ) @property def status_type(self): """expose the type of status for the ui using activity type""" return self.activity_serializer.__name__ @property def boostable(self): """you can't boost dms""" return self.privacy in ["unlisted", "public"] def to_replies(self, **kwargs): """helper function for loading AP serialized replies to a status""" return self.to_ordered_collection( self.replies(self), remote_id=f"{self.remote_id}/replies", collection_only=True, **kwargs, ).serialize() def to_activity_dataclass(self, pure=False): # pylint: disable=arguments-differ """return tombstone if the status is deleted""" if self.deleted: return activitypub.Tombstone( id=self.remote_id, url=self.remote_id, deleted=self.deleted_date.isoformat(), published=self.deleted_date.isoformat(), ) activity = ActivitypubMixin.to_activity_dataclass(self) activity.replies = self.to_replies() # "pure" serialization for non-bookwyrm instances if pure and hasattr(self, "pure_content"): activity.content = self.pure_content if hasattr(activity, "name"): activity.name = self.pure_name activity.type = self.pure_type activity.attachment = [ image_serializer(b.cover, b.alt_text) for b in self.mention_books.all()[:4] if b.cover ] if hasattr(self, "book") and self.book.cover: activity.attachment.append( image_serializer(self.book.cover, self.book.alt_text) ) return activity def to_activity(self, pure=False): # pylint: disable=arguments-differ """json serialized activitypub class""" return self.to_activity_dataclass(pure=pure).serialize() def raise_not_editable(self, viewer): """certain types of status aren't editable""" # first, the standard raise super().raise_not_editable(viewer) if isinstance(self, (GeneratedNote, ReviewRating)): raise PermissionDenied() class GeneratedNote(Status): """these are app-generated messages about user activity""" @property def pure_content(self): """indicate the book in question for mastodon (or w/e) users""" message = self.content books = ", ".join( f'"{book.title}"' for book in self.mention_books.all() ) return f"{self.user.display_name} {message} {books}" activity_serializer = activitypub.GeneratedNote pure_type = "Note" ReadingStatusChoices = models.TextChoices( "ReadingStatusChoices", ["to-read", "reading", "read"] ) class BookStatus(Status): """Shared fields for comments, quotes, reviews""" book = fields.ForeignKey( "Edition", on_delete=models.PROTECT, activitypub_field="inReplyToBook" ) pure_type = "Note" reading_status = fields.CharField( max_length=255, choices=ReadingStatusChoices.choices, null=True, blank=True ) class Meta: """not a real model, sorry""" abstract = True class Comment(BookStatus): """like a review but without a rating and transient""" # this is it's own field instead of a foreign key to the progress update # so that the update can be deleted without impacting the status progress = models.IntegerField( validators=[MinValueValidator(0)], null=True, blank=True ) progress_mode = models.CharField( max_length=3, choices=ProgressMode.choices, default=ProgressMode.PAGE, null=True, blank=True, ) @property def pure_content(self): """indicate the book in question for mastodon (or w/e) users""" return ( f'{self.content}
(comment on ' f'"{self.book.title}")
' ) activity_serializer = activitypub.Comment class Quotation(BookStatus): """like a review but without a rating and transient""" quote = fields.HtmlField() position = models.IntegerField( validators=[MinValueValidator(0)], null=True, blank=True ) position_mode = models.CharField( max_length=3, choices=ProgressMode.choices, default=ProgressMode.PAGE, null=True, blank=True, ) @property def pure_content(self): """indicate the book in question for mastodon (or w/e) users""" quote = re.sub(r"^", '
"', self.quote) quote = re.sub(r"
$", '"', quote) return ( f'{quote} {self.content}' ) activity_serializer = activitypub.Quotation class Review(BookStatus): """a book review""" name = fields.CharField(max_length=255, null=True) rating = fields.DecimalField( default=None, null=True, blank=True, validators=[MinValueValidator(1), MaxValueValidator(5)], decimal_places=2, max_digits=3, ) field_tracker = FieldTracker(fields=["rating"]) @property def pure_name(self): """clarify review names for mastodon serialization""" template = get_template("snippets/generated_status/review_pure_name.html") return template.render( {"book": self.book, "rating": self.rating, "name": self.name} ).strip() @property def pure_content(self): """indicate the book in question for mastodon (or w/e) users""" return self.content activity_serializer = activitypub.Review pure_type = "Article" class ReviewRating(Review): """a subtype of review that only contains a rating""" def save(self, *args, **kwargs): if not self.rating: raise ValueError("ReviewRating object must include a numerical rating") return super().save(*args, **kwargs) @property def pure_content(self): template = get_template("snippets/generated_status/rating.html") return template.render({"book": self.book, "rating": self.rating}).strip() activity_serializer = activitypub.Rating pure_type = "Note" class Boost(ActivityMixin, Status): """boost'ing a post""" boosted_status = fields.ForeignKey( "Status", on_delete=models.PROTECT, related_name="boosters", activitypub_field="object", ) activity_serializer = activitypub.Announce def save(self, *args, **kwargs): """save and notify""" # This constraint can't work as it would cross tables. # class Meta: # unique_together = ('user', 'boosted_status') if ( Boost.objects.filter(boosted_status=self.boosted_status, user=self.user) .exclude(id=self.id) .exists() ): return super().save(*args, **kwargs) def __init__(self, *args, **kwargs): """the user field is "actor" here instead of "attributedTo" """ super().__init__(*args, **kwargs) reserve_fields = ["user", "boosted_status", "published_date", "privacy"] self.simple_fields = [f for f in self.simple_fields if f.name in reserve_fields] self.activity_fields = self.simple_fields self.many_to_many_fields = [] self.image_fields = [] self.deserialize_reverse_fields = [] # pylint: disable=unused-argument @receiver(models.signals.post_save) def preview_image(instance, sender, *args, **kwargs): """Updates book previews if the rating has changed""" if not ENABLE_PREVIEW_IMAGES or sender not in (Review, ReviewRating): return changed_fields = instance.field_tracker.changed() if len(changed_fields) > 0: edition = instance.book generate_edition_preview_image_task.delay(edition.id)