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parallel-library/cps/kobo.py

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
# Copyright (C) 2018-2019 shavitmichael, OzzieIsaacs
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import sys
import uuid
from datetime import datetime
from time import gmtime, strftime
try:
from urllib import unquote
except ImportError:
from urllib.parse import unquote
from flask import (
Blueprint,
request,
make_response,
jsonify,
json,
url_for,
redirect,
)
from flask_login import login_required
from werkzeug.datastructures import Headers
from sqlalchemy import func
import requests
from . import config, logger, kobo_auth, db, helper, services
from .web import download_required
KOBO_FORMATS = {"KEPUB": ["KEPUB"], "EPUB": ["EPUB", "EPUB3"]}
KOBO_STOREAPI_URL = "https://storeapi.kobo.com"
kobo = Blueprint("kobo", __name__, url_prefix="/kobo/<auth_token>")
kobo_auth.disable_failed_auth_redirect_for_blueprint(kobo)
kobo_auth.register_url_value_preprocessor(kobo)
log = logger.create()
def get_store_url_for_current_request():
# Programmatically modify the current url to point to the official Kobo store
base, sep, request_path_with_auth_token = request.full_path.rpartition("/kobo/")
auth_token, sep, request_path = request_path_with_auth_token.rstrip("?").partition(
"/"
)
return KOBO_STOREAPI_URL + "/" + request_path
CONNECTION_SPECIFIC_HEADERS = [
"connection",
"content-encoding",
"content-length",
"transfer-encoding",
]
def redirect_or_proxy_request():
if request.method == "GET":
return redirect(get_store_url_for_current_request(), 307)
else:
# The Kobo device turns other request types into GET requests on redirects, so we instead proxy to the Kobo store ourselves.
outgoing_headers = Headers(request.headers)
outgoing_headers.remove("Host")
store_response = requests.request(
method=request.method,
url=get_store_url_for_current_request(),
headers=outgoing_headers,
data=request.get_data(),
allow_redirects=False,
)
response_headers = store_response.headers
for header_key in CONNECTION_SPECIFIC_HEADERS:
response_headers.pop(header_key, default=None)
return make_response(
store_response.content, store_response.status_code, response_headers.items()
)
@kobo.route("/v1/library/sync")
@login_required
@download_required
def HandleSyncRequest():
sync_token = services.SyncToken.from_headers(request.headers)
log.info("Kobo library sync request received.")
# TODO: Limit the number of books return per sync call, and rely on the sync-continuatation header
# instead so that the device triggers another sync.
new_books_last_modified = sync_token.books_last_modified
new_books_last_created = sync_token.books_last_created
entitlements = []
# We reload the book database so that the user get's a fresh view of the library
# in case of external changes (e.g: adding a book through Calibre).
db.reconnect_db(config)
# sqlite gives unexpected results when performing the last_modified comparison without the datetime cast.
# It looks like it's treating the db.Books.last_modified field as a string and may fail
# the comparison because of the +00:00 suffix.
changed_entries = (
db.session.query(db.Books)
.join(db.Data)
.filter(func.datetime(db.Books.last_modified) > sync_token.books_last_modified)
.filter(db.Data.format.in_(KOBO_FORMATS))
.all()
)
for book in changed_entries:
entitlement = {
"BookEntitlement": create_book_entitlement(book),
"BookMetadata": get_metadata(book),
"ReadingState": reading_state(book),
}
if book.timestamp > sync_token.books_last_created:
entitlements.append({"NewEntitlement": entitlement})
else:
entitlements.append({"ChangedEntitlement": entitlement})
new_books_last_modified = max(
book.last_modified, sync_token.books_last_modified
)
new_books_last_created = max(book.timestamp, sync_token.books_last_modified)
sync_token.books_last_created = new_books_last_created
sync_token.books_last_modified = new_books_last_modified
# Missing feature: Detect server-side book deletions.
return generate_sync_response(request, sync_token, entitlements)
def generate_sync_response(request, sync_token, entitlements):
# We first merge in sync results from the official Kobo store.
outgoing_headers = Headers(request.headers)
outgoing_headers.remove("Host")
sync_token.set_kobo_store_header(outgoing_headers)
store_response = requests.request(
method=request.method,
url=get_store_url_for_current_request(),
headers=outgoing_headers,
data=request.get_data(),
)
store_entitlements = store_response.json()
entitlements += store_entitlements
sync_token.merge_from_store_response(store_response)
response = make_response(jsonify(entitlements))
sync_token.to_headers(response.headers)
try:
# These headers could probably use some more investigation.
response.headers["x-kobo-sync"] = store_response.headers["x-kobo-sync"]
response.headers["x-kobo-sync-mode"] = store_response.headers[
"x-kobo-sync-mode"
]
response.headers["x-kobo-recent-reads"] = store_response.headers[
"x-kobo-recent-reads"
]
except KeyError:
pass
return response
@kobo.route("/v1/library/<book_uuid>/metadata")
@login_required
@download_required
def HandleMetadataRequest(book_uuid):
log.info("Kobo library metadata request received for book %s" % book_uuid)
book = db.session.query(db.Books).filter(db.Books.uuid == book_uuid).first()
if not book or not book.data:
log.info(u"Book %s not found in database", book_uuid)
return redirect_or_proxy_request()
metadata = get_metadata(book)
return jsonify([metadata])
def get_download_url_for_book(book, book_format):
return url_for(
"web.download_link",
book_id=book.id,
book_format=book_format.lower(),
_external=True,
)
def create_book_entitlement(book):
book_uuid = book.uuid
return {
"Accessibility": "Full",
"ActivePeriod": {"From": current_time(),},
"Created": book.timestamp,
"CrossRevisionId": book_uuid,
"Id": book_uuid,
"IsHiddenFromArchive": False,
"IsLocked": False,
# Setting this to true removes from the device.
"IsRemoved": False,
"LastModified": book.last_modified,
"OriginCategory": "Imported",
"RevisionId": book_uuid,
"Status": "Active",
}
def current_time():
return strftime("%Y-%m-%dT%H:%M:%SZ", gmtime())
def get_description(book):
if not book.comments:
return None
return book.comments[0].text
# TODO handle multiple authors
def get_author(book):
if not book.authors:
return None
return book.authors[0].name
def get_publisher(book):
if not book.publishers:
return None
return book.publishers[0].name
def get_series(book):
if not book.series:
return None
return book.series[0].name
def get_metadata(book):
download_urls = []
for book_data in book.data:
if book_data.format not in KOBO_FORMATS:
continue
for kobo_format in KOBO_FORMATS[book_data.format]:
download_urls.append(
{
"Format": kobo_format,
"Size": book_data.uncompressed_size,
"Url": get_download_url_for_book(book, book_data.format),
# The Kobo forma accepts platforms: (Generic, Android)
"Platform": "Generic",
# "DrmType": "None", # Not required
}
)
book_uuid = book.uuid
metadata = {
"Categories": ["00000000-0000-0000-0000-000000000001",],
"Contributors": get_author(book),
"CoverImageId": book_uuid,
"CrossRevisionId": book_uuid,
"CurrentDisplayPrice": {"CurrencyCode": "USD", "TotalAmount": 0},
"CurrentLoveDisplayPrice": {"TotalAmount": 0},
"Description": get_description(book),
"DownloadUrls": download_urls,
"EntitlementId": book_uuid,
"ExternalIds": [],
"Genre": "00000000-0000-0000-0000-000000000001",
"IsEligibleForKoboLove": False,
"IsInternetArchive": False,
"IsPreOrder": False,
"IsSocialEnabled": True,
"Language": "en",
"PhoneticPronunciations": {},
"PublicationDate": book.pubdate,
"Publisher": {"Imprint": "", "Name": get_publisher(book),},
"RevisionId": book_uuid,
"Title": book.title,
"WorkId": book_uuid,
}
if get_series(book):
if sys.version_info < (3, 0):
name = get_series(book).encode("utf-8")
else:
name = get_series(book)
metadata["Series"] = {
"Name": get_series(book),
"Number": book.series_index,
"NumberFloat": float(book.series_index),
# Get a deterministic id based on the series name.
"Id": uuid.uuid3(uuid.NAMESPACE_DNS, name),
}
return metadata
def reading_state(book):
# TODO: Implement
reading_state = {
# "StatusInfo": {
# "LastModified": get_single_cc_value(book, "lastreadtimestamp"),
# "Status": get_single_cc_value(book, "reading_status"),
# }
# TODO: CurrentBookmark, Location
}
return reading_state
@kobo.route(
"/<book_uuid>/image.jpg"
)
@login_required
def HandleCoverImageRequest(book_uuid):
book_cover = helper.get_book_cover_with_uuid(
book_uuid, use_generic_cover_on_failure=False
)
if not book_cover:
return redirect(get_store_url_for_current_request(), 307)
return book_cover
@kobo.route("")
def TopLevelEndpoint():
return make_response(jsonify({}))
# TODO: Implement the following routes
@kobo.route("/v1/library/<dummy>", methods=["DELETE", "GET"])
@kobo.route("/v1/library/<book_uuid>/state", methods=["PUT"])
@kobo.route("/v1/library/tags", methods=["POST"])
@kobo.route("/v1/library/tags/<shelf_name>", methods=["POST"])
@kobo.route("/v1/library/tags/<tag_id>", methods=["DELETE"])
def HandleUnimplementedRequest(book_uuid=None, shelf_name=None, tag_id=None):
return redirect_or_proxy_request()
@kobo.app_errorhandler(404)
def handle_404(err):
# This handler acts as a catch-all for endpoints that we don't have an interest in
# implementing (e.g: v1/analytics/gettests, v1/user/recommendations, etc)
return redirect_or_proxy_request()
@kobo.route("/v1/initialization")
@login_required
def HandleInitRequest():
outgoing_headers = Headers(request.headers)
outgoing_headers.remove("Host")
store_response = requests.request(
method=request.method,
url=get_store_url_for_current_request(),
headers=outgoing_headers,
data=request.get_data(),
)
store_response_json = store_response.json()
if "Resources" in store_response_json:
kobo_resources = store_response_json["Resources"]
calibre_web_url = url_for("web.index", _external=True).strip("/")
kobo_resources["image_host"] = calibre_web_url
kobo_resources["image_url_quality_template"] = unquote(url_for("kobo.HandleCoverImageRequest", _external=True,
auth_token = kobo_auth.get_auth_token(),
book_uuid="{ImageId}"))
kobo_resources["image_url_template"] = unquote(url_for("kobo.HandleCoverImageRequest", _external=True,
auth_token = kobo_auth.get_auth_token(),
book_uuid="{ImageId}"))
return make_response(store_response_json, store_response.status_code)
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