forked from mirrors/bookwyrm
328 lines
11 KiB
Python
328 lines
11 KiB
Python
""" functionality outline for a book data connector """
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from abc import ABC, abstractmethod
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import imghdr
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import logging
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import re
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from django.core.files.base import ContentFile
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from django.db import transaction
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import requests
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from requests.exceptions import RequestException
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from bookwyrm import activitypub, models, settings
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from .connector_manager import load_more_data, ConnectorException, raise_not_valid_url
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from .format_mappings import format_mappings
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logger = logging.getLogger(__name__)
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class AbstractMinimalConnector(ABC):
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"""just the bare bones, for other bookwyrm instances"""
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def __init__(self, identifier):
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# load connector settings
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info = models.Connector.objects.get(identifier=identifier)
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self.connector = info
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# the things in the connector model to copy over
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self_fields = [
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"base_url",
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"books_url",
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"covers_url",
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"search_url",
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"isbn_search_url",
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"name",
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"identifier",
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]
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for field in self_fields:
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setattr(self, field, getattr(info, field))
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def get_search_url(self, query):
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"""format the query url"""
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# Check if the query resembles an ISBN
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if maybe_isbn(query) and self.isbn_search_url and self.isbn_search_url != "":
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return f"{self.isbn_search_url}{query}"
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# NOTE: previously, we tried searching isbn and if that produces no results,
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# searched as free text. This, instead, only searches isbn if it's isbn-y
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return f"{self.search_url}{query}"
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def process_search_response(self, query, data, min_confidence):
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"""Format the search results based on the formt of the query"""
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if maybe_isbn(query):
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return list(self.parse_isbn_search_data(data))[:10]
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return list(self.parse_search_data(data, min_confidence))[:10]
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@abstractmethod
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def get_or_create_book(self, remote_id):
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"""pull up a book record by whatever means possible"""
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@abstractmethod
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def parse_search_data(self, data, min_confidence):
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"""turn the result json from a search into a list"""
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@abstractmethod
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def parse_isbn_search_data(self, data):
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"""turn the result json from a search into a list"""
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class AbstractConnector(AbstractMinimalConnector):
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"""generic book data connector"""
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def __init__(self, identifier):
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super().__init__(identifier)
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# fields we want to look for in book data to copy over
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# title we handle separately.
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self.book_mappings = []
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def get_or_create_book(self, remote_id):
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"""translate arbitrary json into an Activitypub dataclass"""
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# first, check if we have the origin_id saved
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existing = models.Edition.find_existing_by_remote_id(
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remote_id
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) or models.Work.find_existing_by_remote_id(remote_id)
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if existing:
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if hasattr(existing, "default_edition"):
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return existing.default_edition
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return existing
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# load the json data from the remote data source
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data = self.get_book_data(remote_id)
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if self.is_work_data(data):
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try:
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edition_data = self.get_edition_from_work_data(data)
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except (KeyError, ConnectorException):
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# hack: re-use the work data as the edition data
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# this is why remote ids aren't necessarily unique
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edition_data = data
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work_data = data
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else:
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edition_data = data
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try:
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work_data = self.get_work_from_edition_data(data)
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except (KeyError, ConnectorException) as err:
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logger.info(err)
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work_data = data
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if not work_data or not edition_data:
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raise ConnectorException(f"Unable to load book data: {remote_id}")
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with transaction.atomic():
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# create activitypub object
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work_activity = activitypub.Work(
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**dict_from_mappings(work_data, self.book_mappings)
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)
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# this will dedupe automatically
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work = work_activity.to_model(model=models.Work, overwrite=False)
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for author in self.get_authors_from_data(work_data):
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work.authors.add(author)
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edition = self.create_edition_from_data(work, edition_data)
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load_more_data.delay(self.connector.id, work.id)
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return edition
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def get_book_data(self, remote_id): # pylint: disable=no-self-use
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"""this allows connectors to override the default behavior"""
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return get_data(remote_id)
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def create_edition_from_data(self, work, edition_data, instance=None):
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"""if we already have the work, we're ready"""
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mapped_data = dict_from_mappings(edition_data, self.book_mappings)
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mapped_data["work"] = work.remote_id
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edition_activity = activitypub.Edition(**mapped_data)
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edition = edition_activity.to_model(
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model=models.Edition, overwrite=False, instance=instance
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)
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# if we're updating an existing instance, we don't need to load authors
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if instance:
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return edition
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if not edition.connector:
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edition.connector = self.connector
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edition.save(broadcast=False, update_fields=["connector"])
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for author in self.get_authors_from_data(edition_data):
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edition.authors.add(author)
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# use the authors from the work if none are found for the edition
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if not edition.authors.exists() and work.authors.exists():
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edition.authors.set(work.authors.all())
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return edition
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def get_or_create_author(self, remote_id, instance=None):
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"""load that author"""
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if not instance:
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existing = models.Author.find_existing_by_remote_id(remote_id)
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if existing:
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return existing
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data = self.get_book_data(remote_id)
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mapped_data = dict_from_mappings(data, self.author_mappings)
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try:
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activity = activitypub.Author(**mapped_data)
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except activitypub.ActivitySerializerError:
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return None
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# this will dedupe
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return activity.to_model(
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model=models.Author, overwrite=False, instance=instance
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)
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def get_remote_id_from_model(self, obj):
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"""given the data stored, how can we look this up"""
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return getattr(obj, getattr(self, "generated_remote_link_field"))
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def update_author_from_remote(self, obj):
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"""load the remote data from this connector and add it to an existing author"""
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remote_id = self.get_remote_id_from_model(obj)
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return self.get_or_create_author(remote_id, instance=obj)
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def update_book_from_remote(self, obj):
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"""load the remote data from this connector and add it to an existing book"""
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remote_id = self.get_remote_id_from_model(obj)
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data = self.get_book_data(remote_id)
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return self.create_edition_from_data(obj.parent_work, data, instance=obj)
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@abstractmethod
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def is_work_data(self, data):
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"""differentiate works and editions"""
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@abstractmethod
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def get_edition_from_work_data(self, data):
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"""every work needs at least one edition"""
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@abstractmethod
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def get_work_from_edition_data(self, data):
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"""every edition needs a work"""
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@abstractmethod
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def get_authors_from_data(self, data):
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"""load author data"""
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@abstractmethod
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def expand_book_data(self, book):
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"""get more info on a book"""
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def dict_from_mappings(data, mappings):
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"""create a dict in Activitypub format, using mappings supplies by
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the subclass"""
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result = {}
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for mapping in mappings:
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# sometimes there are multiple mappings for one field, don't
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# overwrite earlier writes in that case
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if mapping.local_field in result and result[mapping.local_field]:
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continue
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result[mapping.local_field] = mapping.get_value(data)
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return result
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def get_data(url, params=None, timeout=10):
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"""wrapper for request.get"""
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# check if the url is blocked
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raise_not_valid_url(url)
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try:
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resp = requests.get(
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url,
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params=params,
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headers={ # pylint: disable=line-too-long
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"Accept": (
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'application/json, application/activity+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams"; charset=utf-8'
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),
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"User-Agent": settings.USER_AGENT,
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},
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timeout=timeout,
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)
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except RequestException as err:
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logger.info(err)
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raise ConnectorException(err)
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if not resp.ok:
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raise ConnectorException()
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try:
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data = resp.json()
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except ValueError as err:
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logger.info(err)
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raise ConnectorException(err)
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return data
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def get_image(url, timeout=10):
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"""wrapper for requesting an image"""
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raise_not_valid_url(url)
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try:
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resp = requests.get(
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url,
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headers={
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"User-Agent": settings.USER_AGENT,
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},
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timeout=timeout,
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)
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except RequestException as err:
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logger.info(err)
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return None, None
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if not resp.ok:
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return None, None
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image_content = ContentFile(resp.content)
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extension = imghdr.what(None, image_content.read())
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if not extension:
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logger.info("File requested was not an image: %s", url)
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return None, None
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return image_content, extension
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class Mapping:
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"""associate a local database field with a field in an external dataset"""
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def __init__(self, local_field, remote_field=None, formatter=None):
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noop = lambda x: x
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self.local_field = local_field
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self.remote_field = remote_field or local_field
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self.formatter = formatter or noop
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def get_value(self, data):
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"""pull a field from incoming json and return the formatted version"""
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value = data.get(self.remote_field)
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if not value:
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return None
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try:
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return self.formatter(value)
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except: # pylint: disable=bare-except
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return None
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def infer_physical_format(format_text):
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"""try to figure out what the standardized format is from the free value"""
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format_text = format_text.lower()
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if format_text in format_mappings:
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# try a direct match
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return format_mappings[format_text]
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# failing that, try substring
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matches = [v for k, v in format_mappings.items() if k in format_text]
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if not matches:
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return None
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return matches[0]
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def unique_physical_format(format_text):
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"""only store the format if it isn't diretly in the format mappings"""
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format_text = format_text.lower()
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if format_text in format_mappings:
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# try a direct match, so saving this would be redundant
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return None
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return format_text
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def maybe_isbn(query):
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"""check if a query looks like an isbn"""
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isbn = re.sub(r"[\W_]", "", query) # removes filler characters
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return len(isbn) in [10, 13] # ISBN10 or ISBN13
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