forked from mirrors/bookwyrm
292 lines
9.8 KiB
Python
292 lines
9.8 KiB
Python
""" database schema for books and shelves """
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import re
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from django.db import models, transaction
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from model_utils.managers import InheritanceManager
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from bookwyrm import activitypub
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from bookwyrm.settings import DOMAIN
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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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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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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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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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def broadcast(self, activity, sender, software="bookwyrm"):
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""" only send book data updates to other bookwyrm instances """
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super().broadcast(activity, sender, software=software)
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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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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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@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 = "%s" % self.title
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if self.edition_info:
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text += " (%s)" % 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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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 "https://%s/book/%d" % (DOMAIN, self.id)
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def __repr__(self):
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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 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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# this has to be nullable but should never be null
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default_edition = fields.ForeignKey(
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"Edition", on_delete=models.PROTECT, null=True, load_remote=False
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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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def get_default_edition(self):
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""" in case the default edition is not set """
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return self.default_edition or self.editions.order_by("-edition_rank").first()
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@transaction.atomic()
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def reset_default_edition(self):
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""" sets a new default edition based on computed rank """
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self.default_edition = None
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# editions are re-ranked implicitly
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self.save()
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self.default_edition = self.get_default_edition()
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self.save()
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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="%s/editions" % self.remote_id,
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**kwargs
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)
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activity_serializer = activitypub.Work
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serialize_reverse_fields = [("editions", "editions", "-edition_rank")]
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deserialize_reverse_fields = [("editions", "editions")]
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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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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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pages = fields.IntegerField(blank=True, null=True)
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physical_format = 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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def get_rank(self, ignore_default=False):
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""" calculate how complete the data is on this edition """
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if (
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not ignore_default
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and self.parent_work
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and self.parent_work.default_edition == self
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):
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# default edition has the highest rank
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return 20
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rank = 0
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rank += int(bool(self.cover)) * 3
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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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# set rank
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self.edition_rank = self.get_rank()
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return super().save(*args, **kwargs)
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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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