# -*- coding: utf-8 -*-
# This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
-#
-from django.shortcuts import get_object_or_404
-from django.contrib.auth.decorators import login_required, user_passes_test
+
+from datetime import datetime, timedelta
from piston.handler import BaseHandler
-from piston.utils import rc, validate
-from catalogue.models import Book
-from catalogue.forms import BookImportForm
+from django.conf import settings
+
+from api.helpers import timestamp
+from api.models import Deleted
+from catalogue.models import Book, Tag
-staff_required = user_passes_test(lambda user: user.is_staff)
+class CatalogueHandler(BaseHandler):
+ @staticmethod
+ def fields(request, name):
+ fields_str = request.GET.get(name) if request is not None else None
+ return fields_str.split(',') if fields_str is not None else None
-class BookHandler(BaseHandler):
- model = Book
- fields = ('slug', 'title')
+ @staticmethod
+ def until(t=None):
+ """ Returns time suitable for use as upper time boundary for check.
+
+ Defaults to 'five minutes ago' to avoid issues with time between
+ change stamp set and model save.
+ Cuts the microsecond part to avoid issues with DBs where time has
+ more precision.
- @staff_required
- def read(self, request, slug=None):
- if slug:
- return get_object_or_404(Book, slug=slug)
+ """
+ # set to five minutes ago, to avoid concurrency issues
+ if t is None:
+ t = datetime.now() - timedelta(seconds=settings.API_WAIT)
+ # set to whole second in case DB supports something smaller
+ return t.replace(microsecond=0)
+
+ @staticmethod
+ def book_dict(book, fields=None):
+ all_fields = ('url', 'title', 'description',
+ 'gazeta_link', 'wiki_link',
+ 'xml', 'epub', 'txt', 'pdf', 'html',
+ 'mp3', 'ogg', 'daisy',
+ 'parent', 'parent_number',
+ 'tags',
+ 'license', 'license_description', 'source_name',
+ 'technical_editors', 'editors',
+ 'author', 'sort_key',
+ )
+ if fields:
+ fields = (f for f in fields if f in all_fields)
else:
- return Book.objects.all()
-
- @staff_required
- def create(self, request):
- form = BookImportForm(request.POST, request.FILES)
- if form.is_valid():
- form.save()
- return rc.CREATED
+ fields = all_fields
+
+ extra_info = book.get_extra_info_value()
+
+ obj = {}
+ for field in fields:
+
+ if field in ('xml', 'epub', 'txt', 'pdf', 'html'):
+ f = getattr(book, field+'_file')
+ if f:
+ obj[field] = {
+ 'url': f.url,
+ 'size': f.size,
+ }
+
+ elif field in ('mp3', 'ogg', 'daisy'):
+ media = []
+ for m in book.media.filter(type=field):
+ media.append({
+ 'url': m.file.url,
+ 'size': m.file.size,
+ })
+ if media:
+ obj[field] = media
+
+ elif field == 'url':
+ obj[field] = book.get_absolute_url()
+
+ elif field == 'tags':
+ obj[field] = [t.id for t in book.tags.exclude(category__in=('book', 'set'))]
+
+ elif field == 'author':
+ obj[field] = ", ".join(t.name for t in book.tags.filter(category='author'))
+
+ elif field == 'parent':
+ obj[field] = book.parent_id
+
+ elif field in ('license', 'license_description', 'source_name',
+ 'technical_editors', 'editors'):
+ f = extra_info.get(field)
+ if f:
+ obj[field] = f
+
+ else:
+ f = getattr(book, field)
+ if f:
+ obj[field] = f
+
+ obj['id'] = book.id
+ return obj
+
+ @classmethod
+ def book_changes(cls, request=None, since=0, until=None, fields=None):
+ since = datetime.fromtimestamp(int(since))
+ until = cls.until(until)
+
+ changes = {
+ 'time_checked': timestamp(until)
+ }
+
+ if not fields:
+ fields = cls.fields(request, 'book_fields')
+
+ added = []
+ updated = []
+ deleted = []
+
+ last_change = since
+ for book in Book.objects.filter(changed_at__gte=since,
+ changed_at__lt=until):
+ book_d = cls.book_dict(book, fields)
+ updated.append(book_d)
+ if updated:
+ changes['updated'] = updated
+
+ for book in Deleted.objects.filter(content_type=Book,
+ deleted_at__gte=since,
+ deleted_at__lt=until,
+ created_at__lt=since):
+ deleted.append(book.id)
+ if deleted:
+ changes['deleted'] = deleted
+
+ return changes
+
+ @staticmethod
+ def tag_dict(tag, fields=None):
+ all_fields = ('name', 'category', 'sort_key', 'description',
+ 'gazeta_link', 'wiki_link',
+ 'url', 'books',
+ )
+
+ if fields:
+ fields = (f for f in fields if f in all_fields)
+ else:
+ fields = all_fields
+
+ obj = {}
+ for field in fields:
+
+ if field == 'url':
+ obj[field] = tag.get_absolute_url()
+
+ elif field == 'books':
+ obj[field] = [b.id for b in Book.tagged_top_level([tag])]
+
+ elif field == 'sort_key':
+ obj[field] = tag.sort_key
+
+ else:
+ f = getattr(tag, field)
+ if f:
+ obj[field] = f
+
+ obj['id'] = tag.id
+ return obj
+
+ @classmethod
+ def tag_changes(cls, request=None, since=0, until=None, fields=None, categories=None):
+ since = datetime.fromtimestamp(int(since))
+ until = cls.until(until)
+
+ changes = {
+ 'time_checked': timestamp(until)
+ }
+
+ if not fields:
+ fields = cls.fields(request, 'tag_fields')
+ if not categories:
+ categories = cls.fields(request, 'tag_categories')
+
+ all_categories = ('author', 'epoch', 'kind', 'genre')
+ if categories:
+ categories = (c for c in categories if c in all_categories)
else:
- return rc.BAD_REQUEST
+ categories = all_categories
+
+ updated = []
+ deleted = []
+
+ for tag in Tag.objects.filter(category__in=categories,
+ changed_at__gte=since,
+ changed_at__lt=until):
+ # only serve non-empty tags
+ if tag.get_count():
+ tag_d = cls.tag_dict(tag, fields)
+ updated.append(tag_d)
+ elif tag.created_at < since:
+ deleted.append(tag.id)
+ if updated:
+ changes['updated'] = updated
+
+ for tag in Deleted.objects.filter(category__in=categories,
+ content_type=Tag,
+ deleted_at__gte=since,
+ deleted_at__lt=until,
+ created_at__lt=since):
+ deleted.append(tag.id)
+ if deleted:
+ changes['deleted'] = deleted
+
+ return changes
+
+ @classmethod
+ def changes(cls, request=None, since=0, until=None, book_fields=None,
+ tag_fields=None, tag_categories=None):
+ until = cls.until(until)
+
+ changes = {
+ 'time_checked': timestamp(until)
+ }
+
+ changes_by_type = {
+ 'books': cls.book_changes(request, since, until, book_fields),
+ 'tags': cls.tag_changes(request, since, until, tag_fields, tag_categories),
+ }
+
+ for model in changes_by_type:
+ for field in changes_by_type[model]:
+ if field == 'time_checked':
+ continue
+ changes.setdefault(field, {})[model] = changes_by_type[model][field]
+ return changes
+
+
+class BookChangesHandler(CatalogueHandler):
+ allowed_methods = ('GET',)
+
+ def read(self, request, since):
+ return self.book_changes(request, since)
+
+
+class TagChangesHandler(CatalogueHandler):
+ allowed_methods = ('GET',)
+
+ def read(self, request, since):
+ return self.tag_changes(request, since)
+
+
+class ChangesHandler(CatalogueHandler):
+ allowed_methods = ('GET',)
+ def read(self, request, since):
+ return self.changes(request, since)
fnp / wolnelektury.git / blobdiff