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