forked from mirrors/bookwyrm
279 lines
8.5 KiB
Python
279 lines
8.5 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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'max_query_count',
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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):
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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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resp = requests.get(
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'%s%s' % (self.search_url, query),
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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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)
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if not resp.ok:
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resp.raise_for_status()
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try:
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data = resp.json()
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except ValueError as e:
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logger.exception(e)
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raise ConnectorException('Unable to parse json response', e)
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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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@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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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 is_available(self):
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''' check if you're allowed to use this connector '''
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if self.max_query_count is not None:
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if self.connector.query_count >= self.max_query_count:
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return False
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return True
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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(remote_id) or \
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models.Work.find_existing_by_remote_id(remote_id)
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if existing:
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if hasattr(existing, 'get_default_editon'):
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return existing.get_default_editon()
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return existing
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# load the json
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data = get_data(remote_id)
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mapped_data = dict_from_mappings(data, self.book_mappings)
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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:
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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 = mapped_data
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else:
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try:
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work_data = self.get_work_from_edition_data(data)
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work_data = dict_from_mappings(work_data, self.book_mappings)
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except KeyError:
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work_data = mapped_data
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edition_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(**work_data)
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# this will dedupe automatically
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work = work_activity.to_model(models.Work)
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for author in self.get_authors_from_data(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 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(models.Edition)
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edition.connector = self.connector
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edition.save()
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work.default_edition = edition
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work.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 = get_data(remote_id)
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mapped_data = dict_from_mappings(data, self.author_mappings)
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activity = activitypub.Author(**mapped_data)
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# this will dedupe
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return activity.to_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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result[mapping.local_field] = mapping.get_value(data)
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return result
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def get_data(url):
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''' wrapper for request.get '''
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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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'Accept': 'application/json; charset=utf-8',
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'User-Agent': settings.USER_AGENT,
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},
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)
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except (RequestError, SSLError):
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raise ConnectorException()
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if not resp.ok:
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resp.raise_for_status()
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try:
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data = resp.json()
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except ValueError:
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raise ConnectorException()
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return data
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def get_image(url):
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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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)
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except (RequestError, SSLError):
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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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author: str
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year: str
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connector: object
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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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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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