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506 lines
17 KiB
Python
506 lines
17 KiB
Python
# Support for the Atom, RSS, RDF, and CDF feed formats
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# Copyright 2010-2022 Kurt McKee <contactme@kurtmckee.org>
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# Copyright 2002-2008 Mark Pilgrim
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# All rights reserved.
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#
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# This file is a part of feedparser.
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#
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# Redistribution and use in source and binary forms, with or without modification,
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# are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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import copy
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from ..datetimes import _parse_date
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from ..urls import make_safe_absolute_uri
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from ..util import FeedParserDict
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class Namespace(object):
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"""Support for the Atom, RSS, RDF, and CDF feed formats.
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The feed formats all share common elements, some of which have conflicting
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interpretations. For simplicity, all of the base feed format support is
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collected here.
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"""
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supported_namespaces = {
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'': '',
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'http://backend.userland.com/rss': '',
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'http://blogs.law.harvard.edu/tech/rss': '',
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'http://purl.org/rss/1.0/': '',
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'http://my.netscape.com/rdf/simple/0.9/': '',
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'http://example.com/newformat#': '',
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'http://example.com/necho': '',
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'http://purl.org/echo/': '',
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'uri/of/echo/namespace#': '',
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'http://purl.org/pie/': '',
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'http://purl.org/atom/ns#': '',
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'http://www.w3.org/2005/Atom': '',
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'http://purl.org/rss/1.0/modules/rss091#': '',
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}
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def _start_rss(self, attrs_d):
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versionmap = {
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'0.91': 'rss091u',
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'0.92': 'rss092',
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'0.93': 'rss093',
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'0.94': 'rss094',
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}
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# If we're here then this is an RSS feed.
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# If we don't have a version or have a version that starts with something
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# other than RSS then there's been a mistake. Correct it.
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if not self.version or not self.version.startswith('rss'):
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attr_version = attrs_d.get('version', '')
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version = versionmap.get(attr_version)
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if version:
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self.version = version
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elif attr_version.startswith('2.'):
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self.version = 'rss20'
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else:
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self.version = 'rss'
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def _start_channel(self, attrs_d):
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self.infeed = 1
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self._cdf_common(attrs_d)
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def _cdf_common(self, attrs_d):
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if 'lastmod' in attrs_d:
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self._start_modified({})
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self.elementstack[-1][-1] = attrs_d['lastmod']
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self._end_modified()
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if 'href' in attrs_d:
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self._start_link({})
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self.elementstack[-1][-1] = attrs_d['href']
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self._end_link()
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def _start_feed(self, attrs_d):
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self.infeed = 1
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versionmap = {'0.1': 'atom01',
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'0.2': 'atom02',
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'0.3': 'atom03'}
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if not self.version:
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attr_version = attrs_d.get('version')
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version = versionmap.get(attr_version)
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if version:
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self.version = version
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else:
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self.version = 'atom'
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def _end_channel(self):
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self.infeed = 0
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_end_feed = _end_channel
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def _start_image(self, attrs_d):
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context = self._get_context()
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if not self.inentry:
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context.setdefault('image', FeedParserDict())
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self.inimage = 1
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self.title_depth = -1
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self.push('image', 0)
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def _end_image(self):
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self.pop('image')
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self.inimage = 0
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def _start_textinput(self, attrs_d):
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context = self._get_context()
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context.setdefault('textinput', FeedParserDict())
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self.intextinput = 1
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self.title_depth = -1
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self.push('textinput', 0)
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_start_textInput = _start_textinput
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def _end_textinput(self):
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self.pop('textinput')
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self.intextinput = 0
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_end_textInput = _end_textinput
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def _start_author(self, attrs_d):
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self.inauthor = 1
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self.push('author', 1)
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# Append a new FeedParserDict when expecting an author
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context = self._get_context()
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context.setdefault('authors', [])
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context['authors'].append(FeedParserDict())
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_start_managingeditor = _start_author
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def _end_author(self):
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self.pop('author')
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self.inauthor = 0
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self._sync_author_detail()
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_end_managingeditor = _end_author
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def _start_contributor(self, attrs_d):
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self.incontributor = 1
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context = self._get_context()
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context.setdefault('contributors', [])
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context['contributors'].append(FeedParserDict())
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self.push('contributor', 0)
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def _end_contributor(self):
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self.pop('contributor')
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self.incontributor = 0
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def _start_name(self, attrs_d):
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self.push('name', 0)
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def _end_name(self):
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value = self.pop('name')
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if self.inpublisher:
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self._save_author('name', value, 'publisher')
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elif self.inauthor:
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self._save_author('name', value)
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elif self.incontributor:
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self._save_contributor('name', value)
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elif self.intextinput:
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context = self._get_context()
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context['name'] = value
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def _start_width(self, attrs_d):
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self.push('width', 0)
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def _end_width(self):
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value = self.pop('width')
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try:
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value = int(value)
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except ValueError:
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value = 0
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if self.inimage:
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context = self._get_context()
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context['width'] = value
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def _start_height(self, attrs_d):
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self.push('height', 0)
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def _end_height(self):
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value = self.pop('height')
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try:
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value = int(value)
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except ValueError:
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value = 0
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if self.inimage:
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context = self._get_context()
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context['height'] = value
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def _start_url(self, attrs_d):
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self.push('href', 1)
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_start_homepage = _start_url
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_start_uri = _start_url
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def _end_url(self):
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value = self.pop('href')
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if self.inauthor:
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self._save_author('href', value)
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elif self.incontributor:
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self._save_contributor('href', value)
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_end_homepage = _end_url
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_end_uri = _end_url
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def _start_email(self, attrs_d):
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self.push('email', 0)
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def _end_email(self):
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value = self.pop('email')
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if self.inpublisher:
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self._save_author('email', value, 'publisher')
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elif self.inauthor:
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self._save_author('email', value)
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elif self.incontributor:
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self._save_contributor('email', value)
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def _start_subtitle(self, attrs_d):
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self.push_content('subtitle', attrs_d, 'text/plain', 1)
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_start_tagline = _start_subtitle
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def _end_subtitle(self):
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self.pop_content('subtitle')
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_end_tagline = _end_subtitle
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def _start_rights(self, attrs_d):
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self.push_content('rights', attrs_d, 'text/plain', 1)
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_start_copyright = _start_rights
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def _end_rights(self):
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self.pop_content('rights')
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_end_copyright = _end_rights
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def _start_item(self, attrs_d):
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self.entries.append(FeedParserDict())
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self.push('item', 0)
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self.inentry = 1
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self.guidislink = 0
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self.title_depth = -1
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id = self._get_attribute(attrs_d, 'rdf:about')
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if id:
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context = self._get_context()
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context['id'] = id
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self._cdf_common(attrs_d)
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_start_entry = _start_item
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def _end_item(self):
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self.pop('item')
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self.inentry = 0
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self.hasContent = 0
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_end_entry = _end_item
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def _start_language(self, attrs_d):
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self.push('language', 1)
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def _end_language(self):
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self.lang = self.pop('language')
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def _start_webmaster(self, attrs_d):
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self.push('publisher', 1)
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def _end_webmaster(self):
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self.pop('publisher')
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self._sync_author_detail('publisher')
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def _start_published(self, attrs_d):
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self.push('published', 1)
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_start_issued = _start_published
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_start_pubdate = _start_published
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def _end_published(self):
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value = self.pop('published')
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self._save('published_parsed', _parse_date(value), overwrite=True)
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_end_issued = _end_published
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_end_pubdate = _end_published
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def _start_updated(self, attrs_d):
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self.push('updated', 1)
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_start_modified = _start_updated
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_start_lastbuilddate = _start_updated
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def _end_updated(self):
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value = self.pop('updated')
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parsed_value = _parse_date(value)
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self._save('updated_parsed', parsed_value, overwrite=True)
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_end_modified = _end_updated
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_end_lastbuilddate = _end_updated
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def _start_created(self, attrs_d):
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self.push('created', 1)
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def _end_created(self):
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value = self.pop('created')
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self._save('created_parsed', _parse_date(value), overwrite=True)
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def _start_expirationdate(self, attrs_d):
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self.push('expired', 1)
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def _end_expirationdate(self):
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self._save('expired_parsed', _parse_date(self.pop('expired')), overwrite=True)
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def _start_category(self, attrs_d):
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term = attrs_d.get('term')
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scheme = attrs_d.get('scheme', attrs_d.get('domain'))
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label = attrs_d.get('label')
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self._add_tag(term, scheme, label)
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self.push('category', 1)
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_start_keywords = _start_category
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def _end_category(self):
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value = self.pop('category')
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if not value:
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return
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context = self._get_context()
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tags = context['tags']
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if value and len(tags) and not tags[-1]['term']:
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tags[-1]['term'] = value
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else:
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self._add_tag(value, None, None)
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_end_keywords = _end_category
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def _start_cloud(self, attrs_d):
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self._get_context()['cloud'] = FeedParserDict(attrs_d)
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def _start_link(self, attrs_d):
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attrs_d.setdefault('rel', 'alternate')
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if attrs_d['rel'] == 'self':
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attrs_d.setdefault('type', 'application/atom+xml')
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else:
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attrs_d.setdefault('type', 'text/html')
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context = self._get_context()
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attrs_d = self._enforce_href(attrs_d)
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if 'href' in attrs_d:
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attrs_d['href'] = self.resolve_uri(attrs_d['href'])
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expecting_text = self.infeed or self.inentry or self.insource
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context.setdefault('links', [])
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if not (self.inentry and self.inimage):
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context['links'].append(FeedParserDict(attrs_d))
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if 'href' in attrs_d:
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if (
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attrs_d.get('rel') == 'alternate'
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and self.map_content_type(attrs_d.get('type')) in self.html_types
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):
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context['link'] = attrs_d['href']
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else:
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self.push('link', expecting_text)
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def _end_link(self):
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self.pop('link')
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def _start_guid(self, attrs_d):
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self.guidislink = (attrs_d.get('ispermalink', 'true') == 'true')
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self.push('id', 1)
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_start_id = _start_guid
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def _end_guid(self):
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value = self.pop('id')
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self._save('guidislink', self.guidislink and 'link' not in self._get_context())
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if self.guidislink:
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# guid acts as link, but only if 'ispermalink' is not present or is 'true',
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# and only if the item doesn't already have a link element
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self._save('link', value)
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_end_id = _end_guid
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def _start_title(self, attrs_d):
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if self.svgOK:
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return self.unknown_starttag('title', list(attrs_d.items()))
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self.push_content('title', attrs_d, 'text/plain', self.infeed or self.inentry or self.insource)
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def _end_title(self):
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if self.svgOK:
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return
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value = self.pop_content('title')
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if not value:
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return
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self.title_depth = self.depth
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def _start_description(self, attrs_d):
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context = self._get_context()
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if 'summary' in context and not self.hasContent:
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self._summaryKey = 'content'
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self._start_content(attrs_d)
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else:
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self.push_content('description', attrs_d, 'text/html', self.infeed or self.inentry or self.insource)
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def _start_abstract(self, attrs_d):
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self.push_content('description', attrs_d, 'text/plain', self.infeed or self.inentry or self.insource)
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def _end_description(self):
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if self._summaryKey == 'content':
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self._end_content()
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else:
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self.pop_content('description')
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self._summaryKey = None
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_end_abstract = _end_description
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def _start_info(self, attrs_d):
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self.push_content('info', attrs_d, 'text/plain', 1)
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_start_feedburner_browserfriendly = _start_info
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def _end_info(self):
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self.pop_content('info')
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_end_feedburner_browserfriendly = _end_info
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def _start_generator(self, attrs_d):
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if attrs_d:
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attrs_d = self._enforce_href(attrs_d)
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if 'href' in attrs_d:
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attrs_d['href'] = self.resolve_uri(attrs_d['href'])
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self._get_context()['generator_detail'] = FeedParserDict(attrs_d)
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self.push('generator', 1)
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def _end_generator(self):
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value = self.pop('generator')
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context = self._get_context()
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if 'generator_detail' in context:
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context['generator_detail']['name'] = value
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def _start_summary(self, attrs_d):
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context = self._get_context()
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if 'summary' in context and not self.hasContent:
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self._summaryKey = 'content'
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self._start_content(attrs_d)
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else:
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self._summaryKey = 'summary'
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self.push_content(self._summaryKey, attrs_d, 'text/plain', 1)
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def _end_summary(self):
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if self._summaryKey == 'content':
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self._end_content()
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else:
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self.pop_content(self._summaryKey or 'summary')
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self._summaryKey = None
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def _start_enclosure(self, attrs_d):
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attrs_d = self._enforce_href(attrs_d)
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context = self._get_context()
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attrs_d['rel'] = 'enclosure'
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context.setdefault('links', []).append(FeedParserDict(attrs_d))
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def _start_source(self, attrs_d):
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if 'url' in attrs_d:
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# This means that we're processing a source element from an RSS 2.0 feed
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self.sourcedata['href'] = attrs_d['url']
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self.push('source', 1)
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self.insource = 1
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self.title_depth = -1
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def _end_source(self):
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self.insource = 0
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value = self.pop('source')
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if value:
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self.sourcedata['title'] = value
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self._get_context()['source'] = copy.deepcopy(self.sourcedata)
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self.sourcedata.clear()
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def _start_content(self, attrs_d):
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self.hasContent = 1
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self.push_content('content', attrs_d, 'text/plain', 1)
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src = attrs_d.get('src')
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if src:
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self.contentparams['src'] = src
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self.push('content', 1)
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def _start_body(self, attrs_d):
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self.push_content('content', attrs_d, 'application/xhtml+xml', 1)
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_start_xhtml_body = _start_body
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def _start_content_encoded(self, attrs_d):
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self.hasContent = 1
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self.push_content('content', attrs_d, 'text/html', 1)
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_start_fullitem = _start_content_encoded
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def _end_content(self):
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copyToSummary = self.map_content_type(self.contentparams.get('type')) in ({'text/plain'} | self.html_types)
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value = self.pop_content('content')
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if copyToSummary:
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self._save('summary', value)
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_end_body = _end_content
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_end_xhtml_body = _end_content
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_end_content_encoded = _end_content
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_end_fullitem = _end_content
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def _start_newlocation(self, attrs_d):
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self.push('newlocation', 1)
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def _end_newlocation(self):
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url = self.pop('newlocation')
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context = self._get_context()
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# don't set newlocation if the context isn't right
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if context is not self.feeddata:
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return
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context['newlocation'] = make_safe_absolute_uri(self.baseuri, url.strip())
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