449 lines
14 KiB
Python
449 lines
14 KiB
Python
# -*- coding: utf-8 -*-
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'''
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feedgen.ext.dc
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~~~~~~~~~~~~~~~~~~~
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Extends the FeedGenerator to add Dubline Core Elements to the feeds.
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Descriptions partly taken from
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http://dublincore.org/documents/dcmi-terms/#elements-coverage
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:copyright: 2013, Lars Kiesow <lkiesow@uos.de>
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:license: FreeBSD and LGPL, see license.* for more details.
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'''
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from lxml import etree
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from feedgen.ext.base import BaseExtension, BaseEntryExtension
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class DcBaseExtension(BaseExtension):
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'''Dublin Core Elements extension for podcasts.
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'''
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def __init__(self):
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# http://dublincore.org/documents/usageguide/elements.shtml
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# http://dublincore.org/documents/dces/
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# http://dublincore.org/documents/dcmi-terms/
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self._dcelem_contributor = None
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self._dcelem_coverage = None
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self._dcelem_creator = None
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self._dcelem_date = None
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self._dcelem_description = None
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self._dcelem_format = None
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self._dcelem_identifier = None
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self._dcelem_language = None
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self._dcelem_publisher = None
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self._dcelem_relation = None
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self._dcelem_rights = None
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self._dcelem_source = None
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self._dcelem_subject = None
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self._dcelem_title = None
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self._dcelem_type = None
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def extend_ns(self):
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return {'dc' : 'http://purl.org/dc/elements/1.1/'}
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def extend_atom(self, atom_feed):
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'''Create an Atom feed xml structure containing all previously set fields.
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:returns: The feed root element
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'''
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DCELEMENTS_NS = 'http://purl.org/dc/elements/1.1/'
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feed = atom_feed
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for elem in ['contributor', 'coverage', 'creator', 'date', 'description',
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'language', 'publisher', 'relation', 'rights', 'source', 'subject',
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'title', 'type']:
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if hasattr(self, '_dcelem_%s' % elem):
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for val in getattr(self, '_dcelem_%s' % elem) or []:
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node = etree.SubElement(feed, '{%s}%s' % (DCELEMENTS_NS,elem))
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node.text = val
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if self._dcelem_format:
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node = etree.SubElement(feed, '{%s}format' % DCELEMENTS_NS)
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node.text = format
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if self._dcelem_identifier:
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node = etree.SubElement(feed, '{%s}identifier' % DCELEMENTS_NS)
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node.text = identifier
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return feed
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def extend_rss(self, rss_feed):
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'''Create an RSS feed xml structure containing all previously set fields.
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:returns: Tuple containing the feed root element and the element tree.
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'''
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DCELEMENTS_NS = 'http://purl.org/dc/elements/1.1/'
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channel = rss_feed[0]
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for elem in ['contributor', 'coverage', 'creator', 'date', 'description',
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'language', 'publisher', 'relation', 'rights', 'source', 'subject',
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'title', 'type']:
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if hasattr(self, '_dcelem_%s' % elem):
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for val in getattr(self, '_dcelem_%s' % elem) or []:
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node = etree.SubElement(channel, '{%s}%s' % (DCELEMENTS_NS,elem))
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node.text = val
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if self._dcelem_format:
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node = etree.SubElement(channel, '{%s}format' % DCELEMENTS_NS)
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node.text = format
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if self._dcelem_identifier:
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node = etree.SubElement(channel, '{%s}identifier' % DCELEMENTS_NS)
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node.text = identifier
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return rss_feed
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def dc_contributor(self, contributor=None, replace=False):
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'''Get or set the dc:contributor which is an entity responsible for
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making contributions to the resource.
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For more information see:
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http://dublincore.org/documents/dcmi-terms/#elements-contributor
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:param contributor: Contributor or list of contributors.
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:param replace: Replace alredy set contributors (deault: False).
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:returns: List of contributors.
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'''
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if not contributor is None:
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if not isinstance(contributor, list):
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contributor = [contributor]
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if replace or not self._dcelem_contributor:
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self._dcelem_contributor = []
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self._dcelem_contributor += contributor
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return self._dcelem_contributor
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def dc_coverage(self, coverage=None, replace=True):
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'''Get or set the dc:coverage which indicated the spatial or temporal
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topic of the resource, the spatial applicability of the resource, or the
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jurisdiction under which the resource is relevant.
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Spatial topic and spatial applicability may be a named place or a
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location specified by its geographic coordinates. Temporal topic may be a
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named period, date, or date range. A jurisdiction may be a named
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administrative entity or a geographic place to which the resource
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applies. Recommended best practice is to use a controlled vocabulary such
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as the Thesaurus of Geographic Names [TGN]. Where appropriate, named
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places or time periods can be used in preference to numeric identifiers
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such as sets of coordinates or date ranges.
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References: [TGN] http://www.getty.edu/research/tools/vocabulary/tgn/index.html
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:param coverage: Coverage of the feed.
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:param replace: Replace already set coverage (default: True).
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:returns: Coverage of the feed.
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'''
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if not coverage is None:
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if not isinstance(coverage, list):
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coverage = [coverage]
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if replace or not self._dcelem_coverage:
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self._dcelem_coverage = []
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self._dcelem_coverage = coverage
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return self._dcelem_coverage
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def dc_creator(self, creator=None, replace=False):
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'''Get or set the dc:creator which is an entity primarily responsible for
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making the resource.
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For more information see:
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http://dublincore.org/documents/dcmi-terms/#elements-creator
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:param creator: Creator or list of creators.
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:param replace: Replace alredy set creators (deault: False).
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:returns: List of creators.
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'''
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if not creator is None:
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if not isinstance(creator, list):
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creator = [creator]
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if replace or not self._dcelem_creator:
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self._dcelem_creator = []
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self._dcelem_creator += creator
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return self._dcelem_creator
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def dc_date(self, date=None, replace=True):
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'''Get or set the dc:date which describes a point or period of time
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associated with an event in the lifecycle of the resource.
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For more information see:
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http://dublincore.org/documents/dcmi-terms/#elements-date
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:param date: Date or list of dates.
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:param replace: Replace alredy set dates (deault: True).
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:returns: List of dates.
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'''
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if not date is None:
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if not isinstance(date, list):
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date = [date]
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if replace or not self._dcelem_date:
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self._dcelem_date = []
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self._dcelem_date += date
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return self._dcelem_date
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def dc_description(self, description=None, replace=True):
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'''Get or set the dc:description which is an account of the resource.
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For more information see:
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http://dublincore.org/documents/dcmi-terms/#elements-description
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:param description: Description or list of descriptions.
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:param replace: Replace alredy set descriptions (deault: True).
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:returns: List of descriptions.
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'''
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if not description is None:
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if not isinstance(description, list):
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description = [description]
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if replace or not self._dcelem_description:
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self._dcelem_description = []
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self._dcelem_description += description
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return self._dcelem_description
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def dc_format(self, format=None, replace=True):
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'''Get or set the dc:format which describes the file format, physical
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medium, or dimensions of the resource.
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For more information see:
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http://dublincore.org/documents/dcmi-terms/#elements-format
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:param format: Format of the resource or list of formats.
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:param replace: Replace alredy set format (deault: True).
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:returns: Format of the resource.
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'''
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if not format is None:
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if not isinstance(format, list):
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format = [format]
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if replace or not self._dcelem_format:
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self._dcelem_format = []
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self._dcelem_format += format
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return self._dcelem_format
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def dc_identifier(self, identifier=None, replace=True):
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'''Get or set the dc:identifier which should be an unambiguous reference
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to the resource within a given context.
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If not set, the value of atom:id will be used. But setting this value
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will on the other hand not set atom:id.
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For more inidentifierion see:
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http://dublincore.org/documents/dcmi-terms/#elements-identifier
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:param identifier: Identifier of the resource or list of identifiers.
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:param replace: Replace alredy set format (deault: True).
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:returns: Identifiers of the resource.
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'''
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if not identifier is None:
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if not isinstance(identifier, list):
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identifier = [identifier]
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if replace or not self._dcelem_identifier:
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self._dcelem_identifier = []
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self._dcelem_identifier += identifier
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def dc_language(self, language=None, replace=True):
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'''Get or set the dc:language which describes a language of the resource.
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For more information see:
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http://dublincore.org/documents/dcmi-terms/#elements-language
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:param language: Language or list of languages.
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:param replace: Replace alredy set languages (deault: True).
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:returns: List of languages.
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'''
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if not language is None:
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if not isinstance(language, list):
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language = [language]
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if replace or not self._dcelem_language:
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self._dcelem_language = []
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self._dcelem_language += language
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return self._dcelem_language
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def dc_publisher(self, publisher=None, replace=False):
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'''Get or set the dc:publisher which is an entity responsible for making
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the resource available.
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For more information see:
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http://dublincore.org/documents/dcmi-terms/#elements-publisher
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:param publisher: Publisher or list of publishers.
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:param replace: Replace alredy set publishers (deault: False).
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:returns: List of publishers.
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'''
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if not publisher is None:
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if not isinstance(publisher, list):
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publisher = [publisher]
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if replace or not self._dcelem_publisher:
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self._dcelem_publisher = []
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self._dcelem_publisher += publisher
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return self._dcelem_publisher
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def dc_relation(self, relation=None, replace=False):
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'''Get or set the dc:relation which describes a related ressource.
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For more information see:
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http://dublincore.org/documents/dcmi-terms/#elements-relation
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:param relation: Relation or list of relations.
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:param replace: Replace alredy set relations (deault: False).
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:returns: List of relations.
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'''
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if not relation is None:
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if not isinstance(relation, list):
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relation = [relation]
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if replace or not self._dcelem_relation:
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self._dcelem_relation = []
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self._dcelem_relation += relation
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return self._dcelem_relation
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def dc_rights(self, rights=None, replace=False):
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'''Get or set the dc:rights which may contain information about rights
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held in and over the resource.
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For more information see:
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http://dublincore.org/documents/dcmi-terms/#elements-rights
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:param rights: Rights information or list of rights information.
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:param replace: Replace alredy set rightss (deault: False).
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:returns: List of rights information.
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'''
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if not rights is None:
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if not isinstance(rights, list):
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rights = [rights]
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if replace or not self._dcelem_rights:
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self._dcelem_rights = []
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self._dcelem_rights += rights
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return self._dcelem_rights
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def dc_source(self, source=None, replace=False):
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'''Get or set the dc:source which is a related resource from which the
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described resource is derived.
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The described resource may be derived from the related resource in whole
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or in part. Recommended best practice is to identify the related resource
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by means of a string conforming to a formal identification system.
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For more information see:
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http://dublincore.org/documents/dcmi-terms/#elements-source
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:param source: Source or list of sources.
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:param replace: Replace alredy set sources (deault: False).
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:returns: List of sources.
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'''
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if not source is None:
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if not isinstance(source, list):
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source = [source]
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if replace or not self._dcelem_source:
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self._dcelem_source = []
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self._dcelem_source += source
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return self._dcelem_source
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def dc_subject(self, subject=None, replace=False):
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'''Get or set the dc:subject which describes the topic of the resource.
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For more information see:
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http://dublincore.org/documents/dcmi-terms/#elements-subject
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:param subject: Subject or list of subjects.
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:param replace: Replace alredy set subjects (deault: False).
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:returns: List of subjects.
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'''
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if not subject is None:
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if not isinstance(subject, list):
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subject = [subject]
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if replace or not self._dcelem_subject:
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self._dcelem_subject = []
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self._dcelem_subject += subject
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return self._dcelem_subject
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def dc_title(self, title=None, replace=True):
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'''Get or set the dc:title which is a name given to the resource.
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For more information see:
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http://dublincore.org/documents/dcmi-terms/#elements-title
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:param title: Title or list of titles.
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:param replace: Replace alredy set titles (deault: False).
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:returns: List of titles.
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'''
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if not title is None:
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if not isinstance(title, list):
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title = [title]
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if replace or not self._dcelem_title:
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self._dcelem_title = []
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self._dcelem_title += title
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return self._dcelem_title
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def dc_type(self, type=None, replace=False):
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'''Get or set the dc:type which describes the nature or genre of the
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resource.
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For more information see:
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http://dublincore.org/documents/dcmi-terms/#elements-type
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:param type: Type or list of types.
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:param replace: Replace alredy set types (deault: False).
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:returns: List of types.
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'''
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if not type is None:
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if not isinstance(type, list):
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type = [type]
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if replace or not self._dcelem_type:
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self._dcelem_type = []
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self._dcelem_type += type
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return self._dcelem_type
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class DcExtension(DcBaseExtension):
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'''Dublin Core Elements extension for podcasts.
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'''
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class DcEntryExtension(DcBaseExtension):
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'''Dublin Core Elements extension for podcasts.
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'''
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def extend_atom(self, entry):
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'''NYI. Differs from RSS Implementation?
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'''
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return entry
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def extend_rss(self, item):
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'''Add dc elements to a RSS item. Alters the item itself.
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:returns: The item element.
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'''
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DCELEMENTS_NS = 'http://purl.org/dc/elements/1.1/'
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for elem in ['contributor', 'coverage', 'creator', 'date', 'description',
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'language', 'publisher', 'relation', 'rights', 'source', 'subject',
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'title', 'type']:
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if hasattr(self, '_dcelem_%s' % elem):
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for val in getattr(self, '_dcelem_%s' % elem) or []:
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node = etree.SubElement(item, '{%s}%s' % (DCELEMENTS_NS,elem))
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node.text = val
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if self._dcelem_format:
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node = etree.SubElement(item, '{%s}format' % DCELEMENTS_NS)
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node.text = format
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if self._dcelem_identifier:
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node = etree.SubElement(item, '{%s}identifier' % DCELEMENTS_NS)
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node.text = identifier
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return item
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