X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/82c3054bcdeb000aa9782da80d644070797b5cbe..ae60b2a3949e96357477cc04f90fd0873cee8a92:/apps/oai/handlers.py diff --git a/apps/oai/handlers.py b/apps/oai/handlers.py deleted file mode 100644 index d9699f9fe..000000000 --- a/apps/oai/handlers.py +++ /dev/null @@ -1,238 +0,0 @@ -# -*- 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