--- /dev/null
+# -*- 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 oaipmh import server, common, metadata, error
+from catalogue.models import Book, Tag
+from api.models import Deleted
+from api.handlers import WL_BASE
+from librarian import WLURI
+from django.contrib.contenttypes.models import ContentType
+from datetime import datetime
+from lxml import etree
+from django.conf import settings
+from django.contrib.sites.models import Site
+from django.utils import timezone
+
+
+make_time_naive = lambda d: timezone.localtime(d).replace(tzinfo=None)
+
+WL_DC_READER_XPATH = '(.|*)/rdf:RDF/rdf:Description/%s/text()'
+wl_dc_reader = metadata.MetadataReader(
+ fields={
+ 'title': ('textList', WL_DC_READER_XPATH % 'dc:title'),
+ 'creator': ('textList', WL_DC_READER_XPATH % 'dc:creator'),
+ 'subject': ('textList', (WL_DC_READER_XPATH + ' | ' + WL_DC_READER_XPATH + ' | ' + WL_DC_READER_XPATH) %
+ ('dc:subject.period', 'dc:subject.type', 'dc:subject.genre')),
+ 'description': ('textList', WL_DC_READER_XPATH % 'dc:description'),
+ 'publisher': ('textList', WL_DC_READER_XPATH % 'dc:publisher'),
+ 'contributor': ('textList', (WL_DC_READER_XPATH + ' | ' + WL_DC_READER_XPATH + ' | ' + WL_DC_READER_XPATH) %
+ ('dc:contributor.editor', 'dc:contributor.translator', 'dc:contributor.technical_editor')),
+ 'date': ('textList', WL_DC_READER_XPATH % 'dc:date'),
+ 'type': ('textList', WL_DC_READER_XPATH % 'dc:type'),
+ 'format': ('textList', WL_DC_READER_XPATH % 'dc:format'),
+ 'identifier': ('textList', WL_DC_READER_XPATH % 'dc:identifier.url'),
+ 'source': ('textList', WL_DC_READER_XPATH % 'dc:source'),
+ 'language': ('textList', WL_DC_READER_XPATH % 'dc:language'),
+ #'isPartOf': ('textList', 'rdf:RDF/rdf:Description/dc:relation.isPartOf/text()'),
+ 'hasPart': ('textList', WL_DC_READER_XPATH % 'dc:relation.hasPart'),
+ # 'relation': ('textList', 'rdf:RDF/rdf:Description/dc:relation/text()'),
+ # 'coverage': ('textList', 'rdf:RDF/rdf:Description/dc:coverage/text()'),
+ 'rights': ('textList', WL_DC_READER_XPATH % 'dc:rights')
+ },
+ namespaces={
+ 'dc': 'http://purl.org/dc/elements/1.1/',
+ 'rdf': 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'}
+ )
+
+
+NS_DCTERMS = "http://purl.org/dc/terms/"
+
+
+def nsdcterms(name):
+ return '{%s}%s' % (NS_DCTERMS, name)
+
+
+class Catalogue(common.ResumptionOAIPMH):
+ TAG_CATEGORIES = ['author', 'epoch', 'kind', 'genre']
+
+ def __init__(self, metadata_registry):
+ super(Catalogue, self).__init__()
+ self.metadata_registry = metadata_registry
+
+ self.oai_id = "oai:" + Site.objects.get_current().domain + ":%s"
+
+ # earliest change
+ year_zero = timezone.make_aware(datetime(1990, 1, 1, 0, 0, 0), timezone.utc)
+
+ try:
+ earliest_change = \
+ Book.objects.order_by('changed_at')[0].changed_at
+ except: earliest_change = year_zero
+
+ try:
+ earliest_delete = \
+ Deleted.objects.exclude(slug__exact=u'').ordery_by('deleted_at')[0].deleted_at
+ except: earliest_delete = year_zero
+
+ self.earliest_datestamp = earliest_change <= earliest_delete and \
+ earliest_change or earliest_delete
+
+ def metadata(self, book):
+ try:
+ xml = etree.parse(book.xml_file)
+ finally:
+ book.xml_file.close()
+ md = wl_dc_reader(xml)
+ m = md.getMap()
+ if book.parent:
+ m['isPartOf'] = [str(WLURI.from_slug(book.parent.slug))]
+ return m
+
+ def record_for_book(self, book, headers_only=False):
+ meta = None
+ identifier = self.slug_to_identifier(book.slug)
+ if isinstance(book, Book):
+ # setSpec = map(self.tag_to_setspec, book.tags.filter(category__in=self.TAG_CATEGORIES))
+ header = common.Header(identifier, make_time_naive(book.changed_at), [], False)
+ if not headers_only:
+ meta = common.Metadata(self.metadata(book))
+ about = None
+ elif isinstance(book, Deleted):
+ header = common.Header(identifier, make_time_naive(book.deleted_at), [], True)
+ if not headers_only:
+ meta = common.Metadata({})
+ about = None
+ if headers_only:
+ return header
+ return header, meta, about
+
+ def identify(self, **kw):
+ ident = common.Identify(
+ 'Wolne Lektury', # generate
+ '%s/oaipmh' % unicode(WL_BASE), # generate
+ '2.0', # version
+ [m[1] for m in settings.MANAGERS], # adminEmails
+ make_time_naive(self.earliest_datestamp), # earliest datestamp of any change
+ 'persistent', # deletedRecord
+ 'YYYY-MM-DDThh:mm:ssZ', # granularity
+ ['identity'], # compression
+ [] # descriptions
+ )
+ return ident
+
+ def books(self, tag, from_, until):
+ if tag:
+ # we do not support sets, since they are problematic for deleted books.
+ raise error.NoSetHierarchyError("Wolne Lektury does not support sets.")
+ # books = Book.tagged.with_all([tag])
+ else:
+ books = Book.objects.all()
+ deleted = Deleted.objects.exclude(slug__exact=u'')
+
+ books = books.order_by('changed_at')
+ deleted = deleted.order_by('deleted_at')
+ if from_:
+ books = books.filter(changed_at__gte=from_)
+ deleted = deleted.filter(deleted_at__gte=from_)
+ if until:
+ books = books.filter(changed_at__lte=until)
+ deleted = deleted.filter(deleted_at__lte=until)
+ return list(books) + list(deleted)
+
+ @staticmethod
+ def tag_to_setspec(tag):
+ return "%s:%s" % (tag.category, tag.slug)
+
+ @staticmethod
+ def setspec_to_tag(s):
+ if not s: return None
+ cs = s.split(':')
+ if len(cs) == 2:
+ if not cs[0] in Catalogue.TAG_CATEGORIES:
+ raise error.NoSetHierarchyError("No category part in set")
+ tag = Tag.objects.get(slug=cs[1], category=cs[0])
+ return tag
+ raise error.NoSetHierarchyError("Setspec should have two components: category:slug")
+
+ def getRecord(self, **kw):
+ """
+Returns (header, metadata, about) for given record.
+ """
+ slug = self.identifier_to_slug(kw['identifier'])
+ try:
+ book = Book.objects.get(slug=slug)
+ return self.record_for_book(book)
+ except Book.DoesNotExist:
+ book_type = ContentType.objects.get_for_model(Book)
+ try:
+ deleted_book = Deleted.objects.get(content_type=book_type,
+ slug=slug)
+ except:
+ raise error.IdDoesNotExistError("No item for this identifier")
+ return self.record_for_book(deleted_book)
+
+ def validate_kw(self, kw):
+ if 'resumptionToken' in kw:
+ raise error.BadResumptionTokenError("No resumption token support at this point")
+ if 'metadataPrefix' in kw and not self.metadata_registry.hasWriter(kw['metadataPrefix']):
+ raise error.CannotDisseminateFormatError("This format is not supported")
+
+ def identifier_to_slug(self, ident):
+ return ident.split(':')[-1]
+
+ def slug_to_identifier(self, slug):
+ return self.oai_id % slug
+
+ def listIdentifiers(self, **kw):
+ self.validate_kw(kw)
+ records = [self.record_for_book(book, headers_only=True) for
+ book in self.books(None,
+ kw.get('from_', None),
+ kw.get('until', None))]
+ return records, None
+
+ def listRecords(self, **kw):
+ """
+can get a resumptionToken kw.
+returns result, token
+ """
+ self.validate_kw(kw)
+ records = [self.record_for_book(book) for
+ book in self.books(None,
+ kw.get('from_', None),
+ kw.get('until', None))]
+
+ return records, None
+
+ def listMetadataFormats(self, **kw):
+ formats = [
+ ('oai_dc',
+ 'http://www.openarchives.org/OAI/2.0/oai_dc.xsd',
+ server.NS_OAIDC),
+ ('qdc',
+ 'http://dublincore.org/schemas/xmls/qdc/2006/01/06/dcterms.xsd',
+ NS_DCTERMS)]
+ if 'identifier' in kw:
+ slug = self.identifier_to_slug(kw['identifier'])
+ try:
+ b = Book.objects.get(slug=slug)
+ return formats
+ except:
+ try:
+ d = Deleted.objects.get(slug=slug)
+ return []
+ except:
+ raise error.IdDoesNotExistError("This id does not exist")
+ else:
+ return formats
+
+ def listSets(self, **kw):
+ raise error.NoSetHierarchyError("Wolne Lektury does not support sets.")
+ # tags = []
+ # for category in Catalogue.TAG_CATEGORIES:
+ # for tag in Tag.objects.filter(category=category):
+ # tags.append(("%s:%s" % (tag.category, tag.slug),
+ # tag.name,
+ # tag.description))
+ # return tags, None
fnp / wolnelektury.git / blobdiff