forked from mirrors/bookwyrm
316 lines
9.7 KiB
Python
316 lines
9.7 KiB
Python
""" functionality outline for a book data connector """
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from abc import ABC, abstractmethod
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from dataclasses import asdict, dataclass
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import logging
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from urllib3.exceptions import RequestError
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from django.db import transaction
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import requests
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from requests.exceptions import SSLError
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from bookwyrm import activitypub, models, settings
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from .connector_manager import load_more_data, ConnectorException
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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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"local",
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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 search(self, query, min_confidence=None, timeout=5):
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"""free text search"""
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params = {}
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if min_confidence:
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params["min_confidence"] = min_confidence
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data = self.get_search_data(
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"%s%s" % (self.search_url, query),
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params=params,
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timeout=timeout,
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)
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results = []
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for doc in self.parse_search_data(data)[:10]:
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results.append(self.format_search_result(doc))
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return results
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def isbn_search(self, query):
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"""isbn search"""
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params = {}
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data = self.get_search_data(
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"%s%s" % (self.isbn_search_url, query),
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params=params,
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)
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results = []
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# this shouldn't be returning mutliple results, but just in case
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for doc in self.parse_isbn_search_data(data)[:10]:
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results.append(self.format_isbn_search_result(doc))
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return results
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def get_search_data(self, remote_id, **kwargs): # 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, **kwargs)
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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):
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"""turn the result json from a search into a list"""
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@abstractmethod
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def format_search_result(self, search_result):
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"""create a SearchResult obj from json"""
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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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@abstractmethod
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def format_isbn_search_result(self, search_result):
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"""create a SearchResult obj from json"""
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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
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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.exception(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("Unable to load book data: %s" % 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)
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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):
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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(model=models.Edition)
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edition.connector = self.connector
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edition.save()
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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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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):
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"""load that author"""
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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(model=models.Author)
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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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if models.FederatedServer.is_blocked(url):
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raise ConnectorException(
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"Attempting to load data from blocked url: {:s}".format(url)
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)
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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={
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"Accept": "application/json; charset=utf-8",
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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 (RequestError, SSLError, ConnectionError) as err:
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logger.exception(err)
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raise ConnectorException()
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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.exception(err)
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raise ConnectorException()
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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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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 (RequestError, SSLError) as err:
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logger.exception(err)
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return None
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if not resp.ok:
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return None
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return resp
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@dataclass
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class SearchResult:
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"""standardized search result object"""
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title: str
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key: str
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connector: object
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view_link: str = None
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author: str = None
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year: str = None
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cover: str = None
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confidence: int = 1
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def __repr__(self):
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return "<SearchResult key={!r} title={!r} author={!r}>".format(
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self.key, self.title, self.author
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)
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def json(self):
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"""serialize a connector for json response"""
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serialized = asdict(self)
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del serialized["connector"]
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return serialized
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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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