347 lines
15 KiB
Python
347 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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"""
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werkzeug.contrib.atom
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~~~~~~~~~~~~~~~~~~~~~
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This module provides a class called :class:`AtomFeed` which can be
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used to generate feeds in the Atom syndication format (see :rfc:`4287`).
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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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:copyright: (c) 2013 by the Werkzeug Team, see AUTHORS for more details.
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:license: BSD, see LICENSE for more details.
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"""
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from datetime import datetime
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from werkzeug.utils import escape
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from werkzeug.wrappers import BaseResponse
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from werkzeug._compat import implements_to_string, string_types
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XHTML_NAMESPACE = 'http://www.w3.org/1999/xhtml'
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def _make_text_block(name, content, content_type=None):
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"""Helper function for the builder that creates an XML text block."""
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if content_type == 'xhtml':
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return u'<%s type="xhtml"><div xmlns="%s">%s</div></%s>\n' % \
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(name, XHTML_NAMESPACE, content, name)
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if not content_type:
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return u'<%s>%s</%s>\n' % (name, escape(content), name)
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return u'<%s type="%s">%s</%s>\n' % (name, content_type,
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escape(content), name)
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def format_iso8601(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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@implements_to_string
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class AtomFeed(object):
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"""A helper class that creates Atom feeds.
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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 = ('Werkzeug', None, None)
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def __init__(self, title=None, entries=None, **kwargs):
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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, string_types + (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.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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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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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(*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 a generator that yields pieces of XML."""
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# atom demands either an author element in every entry or a global one
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if not self.author:
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if False in map(lambda e: bool(e.author), self.entries):
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self.author = ({'name': 'Unknown author'},)
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if not self.updated:
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dates = sorted([entry.updated for entry in self.entries])
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self.updated = dates and dates[-1] or datetime.utcnow()
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yield u'<?xml version="1.0" encoding="utf-8"?>\n'
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yield u'<feed xmlns="http://www.w3.org/2005/Atom">\n'
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yield ' ' + _make_text_block('title', self.title, self.title_type)
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yield u' <id>%s</id>\n' % escape(self.id)
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yield u' <updated>%s</updated>\n' % format_iso8601(self.updated)
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if self.url:
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yield u' <link href="%s" />\n' % escape(self.url)
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if self.feed_url:
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yield u' <link href="%s" rel="self" />\n' % \
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escape(self.feed_url)
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for link in self.links:
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yield u' <link %s/>\n' % ''.join('%s="%s" ' % \
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(k, escape(link[k])) for k in link)
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for author in self.author:
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yield u' <author>\n'
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yield u' <name>%s</name>\n' % escape(author['name'])
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if 'uri' in author:
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yield u' <uri>%s</uri>\n' % escape(author['uri'])
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if 'email' in author:
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yield ' <email>%s</email>\n' % escape(author['email'])
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yield ' </author>\n'
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if self.subtitle:
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yield ' ' + _make_text_block('subtitle', self.subtitle,
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self.subtitle_type)
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if self.icon:
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yield u' <icon>%s</icon>\n' % escape(self.icon)
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if self.logo:
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yield u' <logo>%s</logo>\n' % escape(self.logo)
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if self.rights:
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yield ' ' + _make_text_block('rights', self.rights,
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self.rights_type)
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generator_name, generator_url, generator_version = self.generator
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if generator_name or generator_url or generator_version:
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tmp = [u' <generator']
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if generator_url:
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tmp.append(u' uri="%s"' % escape(generator_url))
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if generator_version:
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tmp.append(u' version="%s"' % escape(generator_version))
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tmp.append(u'>%s</generator>\n' % escape(generator_name))
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yield u''.join(tmp)
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for entry in self.entries:
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for line in entry.generate():
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yield u' ' + line
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yield u'</feed>\n'
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def to_string(self):
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"""Convert the feed into a string."""
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return u''.join(self.generate())
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def get_response(self):
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"""Return a response object for the feed."""
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return BaseResponse(self.to_string(), mimetype='application/atom+xml')
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def __call__(self, environ, start_response):
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"""Use the class as WSGI response object."""
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return self.get_response()(environ, start_response)
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def __str__(self):
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return self.to_string()
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@implements_to_string
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class FeedEntry(object):
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"""Represents a single entry in a feed.
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:param title: the title of the entry. 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 content: the content of the entry.
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:param content_type: the type attribute for the content element. One
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of ``'html'``, ``'text'`` or ``'xhtml'``.
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:param summary: a summary of the entry's content.
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:param summary_type: the type attribute for the summary element. One
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of ``'html'``, ``'text'`` or ``'xhtml'``.
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:param url: the url for the entry.
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:param id: a globally unique id for the entry. Must be an URI. If
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not present the URL is used, but one of both is required.
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:param updated: the time the entry was modified the last time. Must
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be a :class:`datetime.datetime` object. Required.
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:param author: the author of the entry. 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 the feed does not have an
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author element.
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:param published: the time the entry was initially published. Must
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be a :class:`datetime.datetime` object.
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:param rights: copyright information for the entry.
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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 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 categories: categories for the entry. Must be a list of dictionaries
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with term (required), scheme and label (all optional)
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:param xml_base: The xml base (url) for this feed item. If not provided
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it will default to the item url.
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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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def __init__(self, title=None, content=None, feed_url=None, **kwargs):
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self.title = title
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self.title_type = kwargs.get('title_type', 'text')
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self.content = content
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self.content_type = kwargs.get('content_type', 'html')
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self.url = kwargs.get('url')
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self.id = kwargs.get('id', self.url)
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self.updated = kwargs.get('updated')
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self.summary = kwargs.get('summary')
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self.summary_type = kwargs.get('summary_type', 'html')
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self.author = kwargs.get('author', ())
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self.published = kwargs.get('published')
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self.rights = kwargs.get('rights')
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self.links = kwargs.get('links', [])
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self.categories = kwargs.get('categories', [])
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self.xml_base = kwargs.get('xml_base', feed_url)
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if not hasattr(self.author, '__iter__') \
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or isinstance(self.author, string_types + (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.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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if not self.updated:
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raise ValueError('updated is required')
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def __repr__(self):
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return '<%s %r>' % (
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self.__class__.__name__,
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self.title
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)
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def generate(self):
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"""Yields pieces of ATOM XML."""
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base = ''
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if self.xml_base:
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base = ' xml:base="%s"' % escape(self.xml_base)
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yield u'<entry%s>\n' % base
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yield u' ' + _make_text_block('title', self.title, self.title_type)
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yield u' <id>%s</id>\n' % escape(self.id)
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yield u' <updated>%s</updated>\n' % format_iso8601(self.updated)
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if self.published:
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yield u' <published>%s</published>\n' % \
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format_iso8601(self.published)
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if self.url:
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yield u' <link href="%s" />\n' % escape(self.url)
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for author in self.author:
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yield u' <author>\n'
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yield u' <name>%s</name>\n' % escape(author['name'])
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if 'uri' in author:
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yield u' <uri>%s</uri>\n' % escape(author['uri'])
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if 'email' in author:
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yield u' <email>%s</email>\n' % escape(author['email'])
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yield u' </author>\n'
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for link in self.links:
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yield u' <link %s/>\n' % ''.join('%s="%s" ' % \
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(k, escape(link[k])) for k in link)
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for category in self.categories:
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yield u' <category %s/>\n' % ''.join('%s="%s" ' % \
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(k, escape(category[k])) for k in category)
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if self.summary:
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yield u' ' + _make_text_block('summary', self.summary,
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self.summary_type)
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if self.content:
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yield u' ' + _make_text_block('content', self.content,
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self.content_type)
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yield u'</entry>\n'
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def to_string(self):
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"""Convert the feed item into a unicode object."""
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return u''.join(self.generate())
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def __str__(self):
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return self.to_string()
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