Removed mediagoblin.tools.feed which was accidentally included
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# GNU MediaGoblin -- federated, autonomous media hosting
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# Copyright (C) 2011 MediaGoblin contributors. See AUTHORS.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from lxml import etree
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from lxml.builder import ElementMaker
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from werkzeug.wrappers import BaseResponse
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import datetime
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"""
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Feed engine written for GNU MediaGoblin,
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based on werkzeug atom feeds tool (werkzeug.contrib.atom)
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The feed library contains two types of classes:
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- Entities that contains the feed data.
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- Generators that are injected to the above classes and are able to
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generate feeds in a specific format. An atom feed genearator is
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provided, but others could be written as well.
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The Werkzeurg library interface have been mimetized, so the replacement can
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be done with only switching the import call.
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Example::
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def atom_feed(request):
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feed = AtomFeed("My Blog", feed_url=request.url,
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url=request.host_url,
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subtitle="My example blog for a feed test.")
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for post in Post.query.limit(10).all():
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feed.add(post.title, post.body, content_type='html',
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author=post.author, url=post.url, id=post.uid,
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updated=post.last_update, published=post.pub_date)
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return feed.get_response()
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"""
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##
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# Class FeedGenerator
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#
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class FeedGenerator(object):
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def __init__(self):
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pass
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def format_iso8601(self, obj):
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"""Format a datetime object for iso8601"""
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return obj.strftime('%Y-%m-%dT%H:%M:%SZ')
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##
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# Class AtomGenerator
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#
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class AtomGenerator(FeedGenerator):
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""" Generator that generate feeds in Atom format """
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NAMESPACE = "http://www.w3.org/2005/Atom"
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def __init__(self):
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pass
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def generate(self, data):
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"""Return an XML tree representation."""
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if isinstance(data, AtomFeed):
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return self.generate_feed(data)
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elif isinstance(data, FeedEntry):
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return self.generate_feedEntry(data)
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def generate_text_block(self, name, content, content_type=None):
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"""Helper method for the builder that creates an XML text block."""
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root = etree.Element(name)
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if content_type:
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root.set('type', content_type)
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if content_type == 'xhtml':
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div_ele = etree.Element('div')
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div_ele.set('xmlns', XHTML_NAMESPACE)
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div_ele.text = content
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root.append(div_ele)
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else:
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root.text = content
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return root
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def generate_feed(self, data):
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"""Return an XML tree representation of the feed."""
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NSMAP = {None: self.NAMESPACE}
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root = etree.Element("feed", nsmap=NSMAP)
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E = ElementMaker()
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# atom demands either an author element in every entry or a global one
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if not data.author:
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if False in map(lambda e: bool(e.author), data.entries):
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data.author = ({'name': 'Unknown author'},)
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if not data.updated:
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dates = sorted([entry.updated for entry in data.entries])
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data.updated = dates and dates[-1] or datetime.utcnow()
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title_ele = self.generate_text_block(
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'title',
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data.title,
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data.title_type)
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root.append(title_ele)
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root.append(E.id(data.id))
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root.append(E.updated(self.format_iso8601(data.updated)))
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if data.url:
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link_ele = etree.Element("link")
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link_ele.set("href", data.url)
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root.append(link_ele)
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if data.feed_url:
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link_ele = etree.Element("link")
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link_ele.set("href", data.feed_url)
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link_ele.set("rel", "self")
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root.append(link_ele)
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for link in data.links:
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link_ele = etree.Element("link")
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for name, value in link.items():
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link_ele.set(name, value)
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root.append(link_ele)
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for author in data.author:
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author_element = etree.Element("author")
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author_element.append(E.name(author['name']))
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if 'uri' in author:
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author_element.append(E.name(author['uri']))
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if 'email' in author:
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author_element.append(E.name(author['email']))
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root.append(author_element)
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if data.subtitle:
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root.append(self.generate_text_block('subtitle', data.subtitle,
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data.subtitle_type))
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if data.icon:
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root.append(E.icon(data.icon))
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if data.logo:
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root.append(E.logo(data.logo))
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if data.rights:
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root.append(self.generate_text_block('rights', data.rights,
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data.rights_type))
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generator_name, generator_url, generator_version = data.generator
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if generator_name or generator_url or generator_version:
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generator_ele = etree.Element("generator")
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if generator_url:
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generator_ele.set("uri", generator_url, True)
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if generator_version:
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generator_ele.set("version", generator_version)
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generator_ele.text = generator_name
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root.append(generator_ele)
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for entry in data.entries:
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root.append(entry.generate())
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return root
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def generate_feedEntry(self, data):
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"""Return an XML tree representation of the feed entry."""
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E = ElementMaker()
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root = etree.Element("entry")
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if data.xml_base:
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root.base = data.xml_base
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title_ele = self.generate_text_block(
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'title',
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data.title,
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data.title_type)
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root.append(title_ele)
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root.append(E.id(data.id))
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root.append(E.updated(self.format_iso8601(data.updated)))
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if data.published:
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root.append(E.published(self.format_iso8601(data.published)))
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if data.url:
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link_ele = etree.Element("link")
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link_ele.set("href", data.url)
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root.append(link_ele)
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for author in data.author:
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author_element = etree.Element("author")
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author_element.append(E.name(author['name']))
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if 'uri' in author:
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author_element.append(E.name(author['uri']))
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if 'email' in author:
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author_element.append(E.name(author['email']))
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root.append(author_element)
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for link in data.links:
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link_ele = etree.Element("link")
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for name, value in link.items():
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link_ele.set(name, value)
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root.append(link_ele)
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print data.thumbnail
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if data.thumbnail:
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namespace = "http://search.yahoo.com/mrss/"
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nsmap = {"media": namespace}
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thumbnail_ele = etree.Element(
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"{http://search.yahoo.com/mrss/}thumbnail", nsmap=nsmap)
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thumbnail_ele.set("url", data.thumbnail)
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root.append(thumbnail_ele)
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if data.summary:
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summary_ele = self.generate_text_block('summary', data.summary,
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data.summary_type)
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root.append(summary_ele)
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if data.content:
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content = data.content
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if data.thumbnail:
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thumbnail_html = etree.Element("img")
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thumbnail_html.set("src", data.thumbnail)
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content = etree.tostring(thumbnail_html) + content
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content_ele = self.generate_text_block('content', content,
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data.content_type)
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root.append(content_ele)
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for name, value in data.custom.items():
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element = etree.Element(name)
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element.text = value
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root.append(element)
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return root
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##
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# Class AtomFeed
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#
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class AtomFeed(object):
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"""
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A helper class that contains feeds. By default, it uses the AtomGenerator
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but others could be injected. It has the AtomFeed name to keep the name
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it had on werkzeug library
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Following Werkzeurg implementation, the constructor takes a lot of
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parameters. As an addition, the class will also store custom parameters for
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fields not explicitly supported by the library.
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:param feed_generator: The generator that will be used to generate the feed
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defaults to AtomGenerator
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:param title: the title of the feed. Required.
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:param title_type: the type attribute for the title element. One of
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``'html'``, ``'text'`` or ``'xhtml'``.
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:param url: the url for the feed (not the url *of* the feed)
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:param id: a globally unique id for the feed. Must be an URI. If
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not present the `feed_url` is used, but one of both is
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required.
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:param updated: the time the feed was modified the last time. Must
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be a :class:`datetime.datetime` object. If not
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present the latest entry's `updated` is used.
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:param feed_url: the URL to the feed. Should be the URL that was
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requested.
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:param author: the author of the feed. Must be either a string (the
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name) or a dict with name (required) and uri or
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email (both optional). Can be a list of (may be
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mixed, too) strings and dicts, too, if there are
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multiple authors. Required if not every entry has an
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author element.
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:param icon: an icon for the feed.
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:param logo: a logo for the feed.
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:param rights: copyright information for the feed.
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:param rights_type: the type attribute for the rights element. One of
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``'html'``, ``'text'`` or ``'xhtml'``. Default is
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``'text'``.
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:param subtitle: a short description of the feed.
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:param subtitle_type: the type attribute for the subtitle element.
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One of ``'text'``, ``'html'``, ``'text'``
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or ``'xhtml'``. Default is ``'text'``.
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:param links: additional links. Must be a list of dictionaries with
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href (required) and rel, type, hreflang, title, length
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(all optional)
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:param generator: the software that generated this feed. This must be
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a tuple in the form ``(name, url, version)``. If
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you don't want to specify one of them, set the item
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to `None`.
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:param entries: a list with the entries for the feed. Entries can also
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be added later with :meth:`add`.
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For more information on the elements see
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http://www.atomenabled.org/developers/syndication/
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Everywhere where a list is demanded, any iterable can be used.
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"""
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default_generator = ('GNU Mediagoblin', None, None)
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default_feed_generator = AtomGenerator()
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def __init__(self, title=None, entries=None, feed_generator=None,
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**kwargs):
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self.feed_generator = feed_generator
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self.title = title
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self.title_type = kwargs.get('title_type', 'text')
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self.url = kwargs.get('url')
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self.feed_url = kwargs.get('feed_url', self.url)
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self.id = kwargs.get('id', self.feed_url)
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self.updated = kwargs.get('updated')
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self.author = kwargs.get('author', ())
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self.icon = kwargs.get('icon')
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self.logo = kwargs.get('logo')
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self.rights = kwargs.get('rights')
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self.rights_type = kwargs.get('rights_type')
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self.subtitle = kwargs.get('subtitle')
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self.subtitle_type = kwargs.get('subtitle_type', 'text')
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self.generator = kwargs.get('generator')
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if self.generator is None:
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self.generator = self.default_generator
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self.links = kwargs.get('links', [])
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self.entries = entries and list(entries) or []
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if not hasattr(self.author, '__iter__') \
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or isinstance(self.author, (basestring, dict)):
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self.author = [self.author]
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for i, author in enumerate(self.author):
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if not isinstance(author, dict):
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self.author[i] = {'name': author}
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if not self.feed_generator:
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self.feed_generator = self.default_feed_generator
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if not self.title:
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raise ValueError('title is required')
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if not self.id:
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raise ValueError('id is required')
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for author in self.author:
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if 'name' not in author:
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raise TypeError('author must contain at least a name')
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# Look for arguments that we haven't matched with object members.
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# They will be added to the custom dictionary.
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# This way we can have custom fields not specified in this class.
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self.custom = {}
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properties = dir(self)
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for name, value in kwargs.items():
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if (properties.count(name) == 0):
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self.custom[name] = value
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def add(self, *args, **kwargs):
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"""Add a new entry to the feed. This function can either be called
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with a :class:`FeedEntry` or some keyword and positional arguments
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that are forwarded to the :class:`FeedEntry` constructor.
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"""
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if len(args) == 1 and not kwargs and isinstance(args[0], FeedEntry):
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args[0].generator = self.generator
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self.entries.append(args[0])
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else:
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kwargs['feed_url'] = self.feed_url
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self.entries.append(FeedEntry(feed_generator=self.feed_generator,
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*args, **kwargs))
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def __repr__(self):
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return '<%s %r (%d entries)>' % (
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self.__class__.__name__,
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self.title,
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len(self.entries)
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)
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def generate(self):
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"""Return an XML tree representation of the feed."""
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return self.feed_generator.generate(self)
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|
||||||
def to_string(self):
|
|
||||||
"""Convert the feed into a string."""
|
|
||||||
return etree.tostring(self.generate(), encoding='UTF-8')
|
|
||||||
|
|
||||||
def get_response(self):
|
|
||||||
"""Return a response object for the feed."""
|
|
||||||
return BaseResponse(self.to_string(), mimetype='application/atom+xml')
|
|
||||||
|
|
||||||
def __call__(self, environ, start_response):
|
|
||||||
"""Use the class as WSGI response object."""
|
|
||||||
return self.get_response()(environ, start_response)
|
|
||||||
|
|
||||||
def __unicode__(self):
|
|
||||||
return self.to_string()
|
|
||||||
|
|
||||||
def __str__(self):
|
|
||||||
return self.to_string().encode('utf-8')
|
|
||||||
|
|
||||||
|
|
||||||
##
|
|
||||||
# Class FeedEntry
|
|
||||||
#
|
|
||||||
class FeedEntry(object):
|
|
||||||
"""Represents a single entry in a feed.
|
|
||||||
|
|
||||||
Following Werkzeurg implementation, the constructor takes a lot of
|
|
||||||
parameters. As an addition, the class will also store custom parameters for
|
|
||||||
fields not explicitly supported by the library.
|
|
||||||
|
|
||||||
:param feed_generator: The generator that will be used to generate the feed.
|
|
||||||
defaults to AtomGenerator
|
|
||||||
:param title: the title of the entry. Required.
|
|
||||||
:param title_type: the type attribute for the title element. One of
|
|
||||||
``'html'``, ``'text'`` or ``'xhtml'``.
|
|
||||||
:param content: the content of the entry.
|
|
||||||
:param content_type: the type attribute for the content element. One
|
|
||||||
of ``'html'``, ``'text'`` or ``'xhtml'``.
|
|
||||||
:param summary: a summary of the entry's content.
|
|
||||||
:param summary_type: the type attribute for the summary element. One
|
|
||||||
of ``'html'``, ``'text'`` or ``'xhtml'``.
|
|
||||||
:param url: the url for the entry.
|
|
||||||
:param id: a globally unique id for the entry. Must be an URI. If
|
|
||||||
not present the URL is used, but one of both is required.
|
|
||||||
:param updated: the time the entry was modified the last time. Must
|
|
||||||
be a :class:`datetime.datetime` object. Required.
|
|
||||||
:param author: the author of the feed. Must be either a string (the
|
|
||||||
name) or a dict with name (required) and uri or
|
|
||||||
email (both optional). Can be a list of (may be
|
|
||||||
mixed, too) strings and dicts, too, if there are
|
|
||||||
multiple authors. Required if not every entry has an
|
|
||||||
author element.
|
|
||||||
:param published: the time the entry was initially published. Must
|
|
||||||
be a :class:`datetime.datetime` object.
|
|
||||||
:param rights: copyright information for the entry.
|
|
||||||
:param rights_type: the type attribute for the rights element. One of
|
|
||||||
``'html'``, ``'text'`` or ``'xhtml'``. Default is
|
|
||||||
``'text'``.
|
|
||||||
:param links: additional links. Must be a list of dictionaries with
|
|
||||||
href (required) and rel, type, hreflang, title, length
|
|
||||||
(all optional)
|
|
||||||
:param xml_base: The xml base (url) for this feed item. If not provided
|
|
||||||
it will default to the item url.
|
|
||||||
|
|
||||||
For more information on the elements see
|
|
||||||
http://www.atomenabled.org/developers/syndication/
|
|
||||||
|
|
||||||
Everywhere where a list is demanded, any iterable can be used.
|
|
||||||
"""
|
|
||||||
|
|
||||||
default_feed_generator = AtomGenerator()
|
|
||||||
|
|
||||||
def __init__(self, title=None, content=None, feed_url=None,
|
|
||||||
feed_generator=None, **kwargs):
|
|
||||||
self.feed_generator = feed_generator
|
|
||||||
self.title = title
|
|
||||||
self.title_type = kwargs.get('title_type', 'text')
|
|
||||||
self.content = content
|
|
||||||
self.content_type = kwargs.get('content_type', 'html')
|
|
||||||
self.url = kwargs.get('url')
|
|
||||||
self.id = kwargs.get('id', self.url)
|
|
||||||
self.updated = kwargs.get('updated')
|
|
||||||
self.summary = kwargs.get('summary')
|
|
||||||
self.summary_type = kwargs.get('summary_type', 'html')
|
|
||||||
self.author = kwargs.get('author')
|
|
||||||
self.published = kwargs.get('published')
|
|
||||||
self.rights = kwargs.get('rights')
|
|
||||||
self.links = kwargs.get('links', [])
|
|
||||||
self.xml_base = kwargs.get('xml_base', feed_url)
|
|
||||||
self.thumbnail = kwargs.get('thumbnail')
|
|
||||||
|
|
||||||
|
|
||||||
if not hasattr(self.author, '__iter__') \
|
|
||||||
or isinstance(self.author, (basestring, dict)):
|
|
||||||
self.author = [self.author]
|
|
||||||
for i, author in enumerate(self.author):
|
|
||||||
if not isinstance(author, dict):
|
|
||||||
self.author[i] = {'name': author}
|
|
||||||
|
|
||||||
if not self.feed_generator:
|
|
||||||
self.feed_generator = self.default_feed_generator
|
|
||||||
if not self.title:
|
|
||||||
raise ValueError('title is required')
|
|
||||||
if not self.id:
|
|
||||||
raise ValueError('id is required')
|
|
||||||
if not self.updated:
|
|
||||||
raise ValueError('updated is required')
|
|
||||||
|
|
||||||
# Look for arguments that we haven't matched with object members.
|
|
||||||
# They will be added to the custom dictionary.
|
|
||||||
# This way we can have custom fields not specified in this class.
|
|
||||||
self.custom = {}
|
|
||||||
properties = dir(self)
|
|
||||||
|
|
||||||
for name, value in kwargs.items():
|
|
||||||
if ( properties.count(name) == 0 ):
|
|
||||||
self.custom[name] = value
|
|
||||||
|
|
||||||
|
|
||||||
def __repr__(self):
|
|
||||||
return '<%s %r>' % (
|
|
||||||
self.__class__.__name__,
|
|
||||||
self.title
|
|
||||||
)
|
|
||||||
|
|
||||||
def generate(self):
|
|
||||||
"""Returns lxml element tree representation of the feed entry"""
|
|
||||||
return self.feed_generator.generate(self)
|
|
||||||
|
|
||||||
def to_string(self):
|
|
||||||
"""Convert the feed item into a unicode object."""
|
|
||||||
return etree.tostring(self.generate(), encoding='utf-8')
|
|
||||||
|
|
||||||
def __unicode__(self):
|
|
||||||
return self.to_string()
|
|
||||||
|
|
||||||
def __str__(self):
|
|
||||||
return self.to_string().encode('utf-8')
|
|
||||||
|
|
||||||
|
|
Loading…
x
Reference in New Issue
Block a user