forked from mirrors/bookwyrm
437 lines
15 KiB
Python
437 lines
15 KiB
Python
""" database schema for books and shelves """
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import re
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from django.contrib.postgres.search import SearchVectorField
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from django.contrib.postgres.indexes import GinIndex
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from django.core.cache import cache
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from django.core.cache.utils import make_template_fragment_key
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from django.db import models, transaction
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from django.db.models import Prefetch
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from django.dispatch import receiver
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from django.utils.translation import gettext_lazy as _
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from model_utils import FieldTracker
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from model_utils.managers import InheritanceManager
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from imagekit.models import ImageSpecField
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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 (
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DOMAIN,
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DEFAULT_LANGUAGE,
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ENABLE_PREVIEW_IMAGES,
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ENABLE_THUMBNAIL_GENERATION,
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)
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from .activitypub_mixin import OrderedCollectionPageMixin, ObjectMixin
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from .base_model import BookWyrmModel
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from . import fields
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class BookDataModel(ObjectMixin, BookWyrmModel):
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"""fields shared between editable book data (books, works, authors)"""
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origin_id = models.CharField(max_length=255, null=True, blank=True)
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openlibrary_key = fields.CharField(
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max_length=255, blank=True, null=True, deduplication_field=True
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)
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inventaire_id = fields.CharField(
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max_length=255, blank=True, null=True, deduplication_field=True
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)
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librarything_key = fields.CharField(
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max_length=255, blank=True, null=True, deduplication_field=True
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)
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goodreads_key = fields.CharField(
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max_length=255, blank=True, null=True, deduplication_field=True
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)
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bnf_id = fields.CharField( # Bibliothèque nationale de France
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max_length=255, blank=True, null=True, deduplication_field=True
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)
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viaf = fields.CharField(
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max_length=255, blank=True, null=True, deduplication_field=True
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)
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wikidata = fields.CharField(
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max_length=255, blank=True, null=True, deduplication_field=True
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)
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asin = fields.CharField(
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max_length=255, blank=True, null=True, deduplication_field=True
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)
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search_vector = SearchVectorField(null=True)
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last_edited_by = fields.ForeignKey(
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"User",
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on_delete=models.PROTECT,
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null=True,
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)
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@property
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def openlibrary_link(self):
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"""generate the url from the openlibrary id"""
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return f"https://openlibrary.org/books/{self.openlibrary_key}"
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@property
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def inventaire_link(self):
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"""generate the url from the inventaire id"""
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return f"https://inventaire.io/entity/{self.inventaire_id}"
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class Meta:
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"""can't initialize this model, that wouldn't make sense"""
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abstract = True
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def save(self, *args, **kwargs):
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"""ensure that the remote_id is within this instance"""
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if self.id:
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self.remote_id = self.get_remote_id()
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else:
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self.origin_id = self.remote_id
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self.remote_id = None
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return super().save(*args, **kwargs)
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# pylint: disable=arguments-differ
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def broadcast(self, activity, sender, software="bookwyrm", **kwargs):
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"""only send book data updates to other bookwyrm instances"""
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super().broadcast(activity, sender, software=software, **kwargs)
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class Book(BookDataModel):
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"""a generic book, which can mean either an edition or a work"""
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connector = models.ForeignKey("Connector", on_delete=models.PROTECT, null=True)
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# book/work metadata
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title = fields.TextField(max_length=255)
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sort_title = fields.CharField(max_length=255, blank=True, null=True)
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subtitle = fields.TextField(max_length=255, blank=True, null=True)
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description = fields.HtmlField(blank=True, null=True)
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languages = fields.ArrayField(
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models.CharField(max_length=255), blank=True, default=list
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)
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series = fields.TextField(max_length=255, blank=True, null=True)
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series_number = fields.CharField(max_length=255, blank=True, null=True)
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subjects = fields.ArrayField(
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models.CharField(max_length=255), blank=True, null=True, default=list
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)
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subject_places = fields.ArrayField(
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models.CharField(max_length=255), blank=True, null=True, default=list
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)
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authors = fields.ManyToManyField("Author")
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cover = fields.ImageField(
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upload_to="covers/", blank=True, null=True, alt_field="alt_text"
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)
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preview_image = models.ImageField(
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upload_to="previews/covers/", blank=True, null=True
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)
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first_published_date = fields.DateTimeField(blank=True, null=True)
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published_date = fields.DateTimeField(blank=True, null=True)
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objects = InheritanceManager()
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field_tracker = FieldTracker(fields=["authors", "title", "subtitle", "cover"])
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if ENABLE_THUMBNAIL_GENERATION:
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cover_bw_book_xsmall_webp = ImageSpecField(
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source="cover", id="bw:book:xsmall:webp"
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)
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cover_bw_book_xsmall_jpg = ImageSpecField(
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source="cover", id="bw:book:xsmall:jpg"
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)
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cover_bw_book_small_webp = ImageSpecField(
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source="cover", id="bw:book:small:webp"
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)
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cover_bw_book_small_jpg = ImageSpecField(source="cover", id="bw:book:small:jpg")
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cover_bw_book_medium_webp = ImageSpecField(
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source="cover", id="bw:book:medium:webp"
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)
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cover_bw_book_medium_jpg = ImageSpecField(
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source="cover", id="bw:book:medium:jpg"
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)
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cover_bw_book_large_webp = ImageSpecField(
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source="cover", id="bw:book:large:webp"
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)
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cover_bw_book_large_jpg = ImageSpecField(source="cover", id="bw:book:large:jpg")
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cover_bw_book_xlarge_webp = ImageSpecField(
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source="cover", id="bw:book:xlarge:webp"
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)
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cover_bw_book_xlarge_jpg = ImageSpecField(
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source="cover", id="bw:book:xlarge:jpg"
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)
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cover_bw_book_xxlarge_webp = ImageSpecField(
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source="cover", id="bw:book:xxlarge:webp"
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)
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cover_bw_book_xxlarge_jpg = ImageSpecField(
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source="cover", id="bw:book:xxlarge:jpg"
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)
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@property
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def author_text(self):
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"""format a list of authors"""
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return ", ".join(a.name for a in self.authors.all())
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@property
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def latest_readthrough(self):
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"""most recent readthrough activity"""
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return self.readthrough_set.order_by("-updated_date").first()
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@property
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def edition_info(self):
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"""properties of this edition, as a string"""
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items = [
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self.physical_format if hasattr(self, "physical_format") else None,
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self.languages[0] + " language"
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if self.languages and self.languages[0] != "English"
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else None,
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str(self.published_date.year) if self.published_date else None,
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", ".join(self.publishers) if hasattr(self, "publishers") else None,
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]
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return ", ".join(i for i in items if i)
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@property
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def alt_text(self):
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"""image alt test"""
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text = self.title
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if self.edition_info:
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text += f" ({self.edition_info})"
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return text
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def save(self, *args, **kwargs):
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"""can't be abstract for query reasons, but you shouldn't USE it"""
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if not isinstance(self, Edition) and not isinstance(self, Work):
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raise ValueError("Books should be added as Editions or Works")
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# clear template caches
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cache_key = make_template_fragment_key("titleby", [self.id])
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cache.delete(cache_key)
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return super().save(*args, **kwargs)
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def get_remote_id(self):
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"""editions and works both use "book" instead of model_name"""
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return f"https://{DOMAIN}/book/{self.id}"
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def __repr__(self):
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# pylint: disable=consider-using-f-string
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return "<{} key={!r} title={!r}>".format(
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self.__class__,
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self.openlibrary_key,
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self.title,
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)
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class Meta:
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"""sets up postgres GIN index field"""
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indexes = (GinIndex(fields=["search_vector"]),)
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class Work(OrderedCollectionPageMixin, Book):
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"""a work (an abstract concept of a book that manifests in an edition)"""
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# library of congress catalog control number
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lccn = fields.CharField(
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max_length=255, blank=True, null=True, deduplication_field=True
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)
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def save(self, *args, **kwargs):
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"""set some fields on the edition object"""
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# set rank
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for edition in self.editions.all():
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edition.save()
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return super().save(*args, **kwargs)
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@property
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def default_edition(self):
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"""in case the default edition is not set"""
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return self.editions.order_by("-edition_rank").first()
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def to_edition_list(self, **kwargs):
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"""an ordered collection of editions"""
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return self.to_ordered_collection(
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self.editions.order_by("-edition_rank").all(),
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remote_id=f"{self.remote_id}/editions",
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**kwargs,
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)
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activity_serializer = activitypub.Work
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serialize_reverse_fields = [
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("editions", "editions", "-edition_rank"),
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("file_links", "fileLinks", "-created_date"),
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]
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deserialize_reverse_fields = [("editions", "editions"), ("file_links", "fileLinks")]
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# https://schema.org/BookFormatType
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FormatChoices = [
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("AudiobookFormat", _("Audiobook")),
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("EBook", _("eBook")),
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("GraphicNovel", _("Graphic novel")),
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("Hardcover", _("Hardcover")),
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("Paperback", _("Paperback")),
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]
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class Edition(Book):
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"""an edition of a book"""
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# these identifiers only apply to editions, not works
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isbn_10 = fields.CharField(
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max_length=255, blank=True, null=True, deduplication_field=True
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)
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isbn_13 = fields.CharField(
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max_length=255, blank=True, null=True, deduplication_field=True
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)
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oclc_number = fields.CharField(
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max_length=255, blank=True, null=True, deduplication_field=True
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)
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pages = fields.IntegerField(blank=True, null=True)
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physical_format = fields.CharField(
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max_length=255, choices=FormatChoices, null=True, blank=True
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)
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physical_format_detail = fields.CharField(max_length=255, blank=True, null=True)
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publishers = fields.ArrayField(
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models.CharField(max_length=255), blank=True, default=list
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)
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shelves = models.ManyToManyField(
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"Shelf",
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symmetrical=False,
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through="ShelfBook",
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through_fields=("book", "shelf"),
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)
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parent_work = fields.ForeignKey(
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"Work",
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on_delete=models.PROTECT,
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null=True,
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related_name="editions",
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activitypub_field="work",
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)
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edition_rank = fields.IntegerField(default=0)
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activity_serializer = activitypub.Edition
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name_field = "title"
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serialize_reverse_fields = [("file_links", "fileLinks", "-created_date")]
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deserialize_reverse_fields = [("file_links", "fileLinks")]
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def get_rank(self):
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"""calculate how complete the data is on this edition"""
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rank = 0
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# big ups for havinga cover
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rank += int(bool(self.cover)) * 3
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# is it in the instance's preferred language?
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rank += int(bool(DEFAULT_LANGUAGE in self.languages))
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# prefer print editions
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if self.physical_format:
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rank += int(
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bool(self.physical_format.lower() in ["paperback", "hardcover"])
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)
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# does it have metadata?
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rank += int(bool(self.isbn_13))
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rank += int(bool(self.isbn_10))
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rank += int(bool(self.oclc_number))
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rank += int(bool(self.pages))
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rank += int(bool(self.physical_format))
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rank += int(bool(self.description))
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# max rank is 9
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return rank
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def save(self, *args, **kwargs):
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"""set some fields on the edition object"""
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# calculate isbn 10/13
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if self.isbn_13 and self.isbn_13[:3] == "978" and not self.isbn_10:
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self.isbn_10 = isbn_13_to_10(self.isbn_13)
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if self.isbn_10 and not self.isbn_13:
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self.isbn_13 = isbn_10_to_13(self.isbn_10)
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# normalize isbn format
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if self.isbn_10:
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self.isbn_10 = re.sub(r"[^0-9X]", "", self.isbn_10)
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if self.isbn_13:
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self.isbn_13 = re.sub(r"[^0-9X]", "", self.isbn_13)
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# set rank
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self.edition_rank = self.get_rank()
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# clear author cache
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if self.id:
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for author_id in self.authors.values_list("id", flat=True):
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cache.delete(f"author-books-{author_id}")
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return super().save(*args, **kwargs)
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@classmethod
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def viewer_aware_objects(cls, viewer):
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"""annotate a book query with metadata related to the user"""
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queryset = cls.objects
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if not viewer or not viewer.is_authenticated:
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return queryset
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queryset = queryset.prefetch_related(
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Prefetch(
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"shelfbook_set",
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queryset=viewer.shelfbook_set.all(),
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to_attr="current_shelves",
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),
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Prefetch(
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"readthrough_set",
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queryset=viewer.readthrough_set.filter(is_active=True).all(),
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to_attr="active_readthroughs",
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),
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)
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return queryset
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def isbn_10_to_13(isbn_10):
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"""convert an isbn 10 into an isbn 13"""
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isbn_10 = re.sub(r"[^0-9X]", "", isbn_10)
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# drop the last character of the isbn 10 number (the original checkdigit)
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converted = isbn_10[:9]
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# add "978" to the front
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converted = "978" + converted
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# add a check digit to the end
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# multiply the odd digits by 1 and the even digits by 3 and sum them
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try:
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checksum = sum(int(i) for i in converted[::2]) + sum(
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int(i) * 3 for i in converted[1::2]
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)
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except ValueError:
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return None
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# add the checksum mod 10 to the end
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checkdigit = checksum % 10
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if checkdigit != 0:
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checkdigit = 10 - checkdigit
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return converted + str(checkdigit)
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def isbn_13_to_10(isbn_13):
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"""convert isbn 13 to 10, if possible"""
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if isbn_13[:3] != "978":
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return None
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isbn_13 = re.sub(r"[^0-9X]", "", isbn_13)
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# remove '978' and old checkdigit
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converted = isbn_13[3:-1]
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# calculate checkdigit
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# multiple each digit by 10,9,8.. successively and sum them
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try:
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checksum = sum(int(d) * (10 - idx) for (idx, d) in enumerate(converted))
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except ValueError:
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return None
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checkdigit = checksum % 11
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checkdigit = 11 - checkdigit
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if checkdigit == 10:
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checkdigit = "X"
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return converted + str(checkdigit)
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# pylint: disable=unused-argument
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@receiver(models.signals.post_save, sender=Edition)
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def preview_image(instance, *args, **kwargs):
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"""create preview image on book create"""
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if not ENABLE_PREVIEW_IMAGES:
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return
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changed_fields = {}
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if instance.field_tracker:
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changed_fields = instance.field_tracker.changed()
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if len(changed_fields) > 0:
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transaction.on_commit(
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lambda: generate_edition_preview_image_task.delay(instance.id)
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)
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