X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/a33d4ff020fa16e0359991023a2cd031831e9ec4..ad39c2501159fa52e980c95af3e735e36b459c15:/apps/oai/handlers.py diff --git a/apps/oai/handlers.py b/apps/oai/handlers.py index db4365730..197ca7987 100644 --- a/apps/oai/handlers.py +++ b/apps/oai/handlers.py @@ -1,58 +1,238 @@ - -from oaipmh import server, common +# -*- 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 librarian.dcparser import BookInfo +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): - def __init__(self): + 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): - bi = BookInfo.from_file(book.xml_file) - meta = {} - for field in bi.FIELDS: - dc_field = field.uri.split('}')[1] - value = getattr(bi, dc_field.name) - if isinstance(value,list): - value = ';'.join(map(unicode, value)) - else: - value = unicode(value) - meta["dc:"+dc_field] = value - return meta - - def record_for_book(self, book): - header = common.Header(book.slug, book.changed_at, [], False) - meta = common.Metadata(self.metadata(book)) - about = None + 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 getRecord(self, record, **kw): + def identify(self, **kw): + ident = common.Identify( + 'Wolne Lektury', # generate + '%s/oaipmh' % 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 = kw['record'] + slug = self.identifier_to_slug(kw['identifier']) try: book = Book.objects.get(slug=slug) return self.record_for_book(book) - except Book.DoesNotExist, e: + except Book.DoesNotExist: book_type = ContentType.objects.get_for_model(Book) - deleted_book = Deleted.objects.filter(content_type=book_type, + try: + deleted_book = Deleted.objects.get(content_type=book_type, slug=slug) - header = common.Header(deleted_book.slug, - deleted_book.deleted_at, - [], True) - meta = common.Metadata({}) - return header, meta, None # None for about. - - - + 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 """ - return [self.record_for_book(book) for book in Book.objects.all()] - + 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