moviewyrm/bookwyrm/models/book.py
2021-05-27 21:40:23 +02:00

314 lines
11 KiB
Python

""" database schema for books and shelves """
import re
from django.db import models
from django.dispatch import receiver
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 DOMAIN, DEFAULT_LANGUAGE
from bookwyrm.tasks import app
from .activitypub_mixin import OrderedCollectionPageMixin, ObjectMixin
from .base_model import BookWyrmModel
from . import fields
class BookDataModel(ObjectMixin, BookWyrmModel):
"""fields shared between editable book data (books, works, authors)"""
origin_id = models.CharField(max_length=255, null=True, blank=True)
openlibrary_key = fields.CharField(
max_length=255, blank=True, null=True, deduplication_field=True
)
inventaire_id = fields.CharField(
max_length=255, blank=True, null=True, deduplication_field=True
)
librarything_key = fields.CharField(
max_length=255, blank=True, null=True, deduplication_field=True
)
goodreads_key = fields.CharField(
max_length=255, blank=True, null=True, deduplication_field=True
)
bnf_id = fields.CharField( # Bibliothèque nationale de France
max_length=255, blank=True, null=True, deduplication_field=True
)
last_edited_by = fields.ForeignKey(
"User",
on_delete=models.PROTECT,
null=True,
)
class Meta:
"""can't initialize this model, that wouldn't make sense"""
abstract = True
def save(self, *args, **kwargs):
"""ensure that the remote_id is within this instance"""
if self.id:
self.remote_id = self.get_remote_id()
else:
self.origin_id = self.remote_id
self.remote_id = None
return super().save(*args, **kwargs)
def broadcast(self, activity, sender, software="bookwyrm"):
"""only send book data updates to other bookwyrm instances"""
super().broadcast(activity, sender, software=software)
class Book(BookDataModel):
"""a generic book, which can mean either an edition or a work"""
connector = models.ForeignKey("Connector", on_delete=models.PROTECT, null=True)
# book/work metadata
title = fields.TextField(max_length=255)
sort_title = fields.CharField(max_length=255, blank=True, null=True)
subtitle = fields.TextField(max_length=255, blank=True, null=True)
description = fields.HtmlField(blank=True, null=True)
languages = fields.ArrayField(
models.CharField(max_length=255), blank=True, default=list
)
series = fields.TextField(max_length=255, blank=True, null=True)
series_number = fields.CharField(max_length=255, blank=True, null=True)
subjects = fields.ArrayField(
models.CharField(max_length=255), blank=True, null=True, default=list
)
subject_places = fields.ArrayField(
models.CharField(max_length=255), blank=True, null=True, default=list
)
authors = fields.ManyToManyField("Author")
cover = fields.ImageField(
upload_to="covers/", blank=True, null=True, alt_field="alt_text"
)
preview_image = models.ImageField(
upload_to="previews/covers/", blank=True, null=True
)
first_published_date = fields.DateTimeField(blank=True, null=True)
published_date = fields.DateTimeField(blank=True, null=True)
objects = InheritanceManager()
field_tracker = FieldTracker(fields=["authors", "title", "subtitle", "cover"])
@property
def author_text(self):
"""format a list of authors"""
return ", ".join(a.name for a in self.authors.all())
@property
def latest_readthrough(self):
"""most recent readthrough activity"""
return self.readthrough_set.order_by("-updated_date").first()
@property
def edition_info(self):
"""properties of this edition, as a string"""
items = [
self.physical_format if hasattr(self, "physical_format") else None,
self.languages[0] + " language"
if self.languages and self.languages[0] != "English"
else None,
str(self.published_date.year) if self.published_date else None,
", ".join(self.publishers) if hasattr(self, "publishers") else None,
]
return ", ".join(i for i in items if i)
@property
def alt_text(self):
"""image alt test"""
text = "%s" % self.title
if self.edition_info:
text += " (%s)" % self.edition_info
return text
def save(self, *args, **kwargs):
"""can't be abstract for query reasons, but you shouldn't USE it"""
if not isinstance(self, Edition) and not isinstance(self, Work):
raise ValueError("Books should be added as Editions or Works")
return super().save(*args, **kwargs)
def get_remote_id(self):
"""editions and works both use "book" instead of model_name"""
return "https://%s/book/%d" % (DOMAIN, self.id)
def __repr__(self):
return "<{} key={!r} title={!r}>".format(
self.__class__,
self.openlibrary_key,
self.title,
)
class Work(OrderedCollectionPageMixin, Book):
"""a work (an abstract concept of a book that manifests in an edition)"""
# library of congress catalog control number
lccn = fields.CharField(
max_length=255, blank=True, null=True, deduplication_field=True
)
def save(self, *args, **kwargs):
"""set some fields on the edition object"""
# set rank
for edition in self.editions.all():
edition.save()
return super().save(*args, **kwargs)
@property
def default_edition(self):
"""in case the default edition is not set"""
return self.editions.order_by("-edition_rank").first()
def to_edition_list(self, **kwargs):
"""an ordered collection of editions"""
return self.to_ordered_collection(
self.editions.order_by("-edition_rank").all(),
remote_id="%s/editions" % self.remote_id,
**kwargs,
)
activity_serializer = activitypub.Work
serialize_reverse_fields = [("editions", "editions", "-edition_rank")]
deserialize_reverse_fields = [("editions", "editions")]
class Edition(Book):
"""an edition of a book"""
# these identifiers only apply to editions, not works
isbn_10 = fields.CharField(
max_length=255, blank=True, null=True, deduplication_field=True
)
isbn_13 = fields.CharField(
max_length=255, blank=True, null=True, deduplication_field=True
)
oclc_number = fields.CharField(
max_length=255, blank=True, null=True, deduplication_field=True
)
asin = fields.CharField(
max_length=255, blank=True, null=True, deduplication_field=True
)
pages = fields.IntegerField(blank=True, null=True)
physical_format = fields.CharField(max_length=255, blank=True, null=True)
publishers = fields.ArrayField(
models.CharField(max_length=255), blank=True, default=list
)
shelves = models.ManyToManyField(
"Shelf",
symmetrical=False,
through="ShelfBook",
through_fields=("book", "shelf"),
)
parent_work = fields.ForeignKey(
"Work",
on_delete=models.PROTECT,
null=True,
related_name="editions",
activitypub_field="work",
)
edition_rank = fields.IntegerField(default=0)
activity_serializer = activitypub.Edition
name_field = "title"
def get_rank(self):
"""calculate how complete the data is on this edition"""
rank = 0
# big ups for havinga cover
rank += int(bool(self.cover)) * 3
# is it in the instance's preferred language?
rank += int(bool(DEFAULT_LANGUAGE in self.languages))
# prefer print editions
if self.physical_format:
rank += int(
bool(self.physical_format.lower() in ["paperback", "hardcover"])
)
# does it have metadata?
rank += int(bool(self.isbn_13))
rank += int(bool(self.isbn_10))
rank += int(bool(self.oclc_number))
rank += int(bool(self.pages))
rank += int(bool(self.physical_format))
rank += int(bool(self.description))
# max rank is 9
return rank
def save(self, *args, **kwargs):
"""set some fields on the edition object"""
# calculate isbn 10/13
if self.isbn_13 and self.isbn_13[:3] == "978" and not self.isbn_10:
self.isbn_10 = isbn_13_to_10(self.isbn_13)
if self.isbn_10 and not self.isbn_13:
self.isbn_13 = isbn_10_to_13(self.isbn_10)
# normalize isbn format
if self.isbn_10:
self.isbn_10 = re.sub(r"[^0-9X]", "", self.isbn_10)
if self.isbn_13:
self.isbn_13 = re.sub(r"[^0-9X]", "", self.isbn_13)
# set rank
self.edition_rank = self.get_rank()
return super().save(*args, **kwargs)
def isbn_10_to_13(isbn_10):
"""convert an isbn 10 into an isbn 13"""
isbn_10 = re.sub(r"[^0-9X]", "", isbn_10)
# drop the last character of the isbn 10 number (the original checkdigit)
converted = isbn_10[:9]
# add "978" to the front
converted = "978" + converted
# add a check digit to the end
# multiply the odd digits by 1 and the even digits by 3 and sum them
try:
checksum = sum(int(i) for i in converted[::2]) + sum(
int(i) * 3 for i in converted[1::2]
)
except ValueError:
return None
# add the checksum mod 10 to the end
checkdigit = checksum % 10
if checkdigit != 0:
checkdigit = 10 - checkdigit
return converted + str(checkdigit)
def isbn_13_to_10(isbn_13):
"""convert isbn 13 to 10, if possible"""
if isbn_13[:3] != "978":
return None
isbn_13 = re.sub(r"[^0-9X]", "", isbn_13)
# remove '978' and old checkdigit
converted = isbn_13[3:-1]
# calculate checkdigit
# multiple each digit by 10,9,8.. successively and sum them
try:
checksum = sum(int(d) * (10 - idx) for (idx, d) in enumerate(converted))
except ValueError:
return None
checkdigit = checksum % 11
checkdigit = 11 - checkdigit
if checkdigit == 10:
checkdigit = "X"
return converted + str(checkdigit)
@receiver(models.signals.post_save, sender=Edition)
# pylint: disable=unused-argument
def preview_image(instance, *args, **kwargs):
changed_fields = {}
if instance.field_tracker:
changed_fields = instance.field_tracker.changed()
if len(changed_fields) > 0:
generate_edition_preview_image_task.delay(instance.id)