mirror of
https://github.com/Mikaela/Limnoria.git
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520 lines
18 KiB
Python
520 lines
18 KiB
Python
#!/usr/bin/env python
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"""Ultra-liberal RSS parser
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Visit http://diveintomark.org/projects/rss_parser/ for the latest version
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Handles RSS 0.9x and RSS 1.0 feeds
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RSS 0.9x elements:
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- title, link, description, webMaster, managingEditor, language
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copyright, lastBuildDate, pubDate
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RSS 1.0 elements:
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- dc:rights, dc:language, dc:creator, dc:date, dc:subject,
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content:encoded
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Things it handles that choke other RSS parsers:
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- bastard combinations of RSS 0.9x and RSS 1.0 (most Movable Type feeds)
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- illegal XML characters (most Radio feeds)
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- naked and/or invalid HTML in description (The Register)
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- content:encoded in item element (Aaron Swartz)
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- guid in item element (Scripting News)
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- fullitem in item element (Jon Udell)
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- non-standard namespaces (BitWorking)
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Requires Python 2.2 or later
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"""
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__author__ = "Mark Pilgrim (f8dy@diveintomark.org)"
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__copyright__ = "Copyright 2002, Mark Pilgrim"
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__contributors__ = ["Jason Diamond (jason@injektilo.org)"]
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__license__ = "GPL"
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__history__ = """
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1.0 - 9/27/2002 - MAP - fixed namespace processing on prefixed RSS 2.0 elements,
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added Simon Fell's test suite
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1.1 - 9/29/2002 - MAP - fixed infinite loop on incomplete CDATA sections
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2.0 - 10/19/2002
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JD - use inchannel to watch out for image and textinput elements which can
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also contain title, link, and description elements
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JD - check for isPermaLink="false" attribute on guid elements
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JD - replaced openAnything with open_resource supporting ETag and
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If-Modified-Since request headers
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JD - parse now accepts etag, modified, agent, and referrer optional
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arguments
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JD - modified parse to return a dictionary instead of a tuple so that any
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etag or modified information can be returned and cached by the caller
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2.0.1 - 10/21/2002 - MAP - changed parse() so that if we don't get anything
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because of etag/modified, return the old etag/modified to the caller to
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indicate why nothing is being returned
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2.0.2 - 10/21/2002 - JB - added the inchannel to the if statement, otherwise its
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useless. Fixes the problem JD was addressing by adding it.
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2.1 - 11/14/2002 - MAP - added gzip support
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2.2 - 1/27/2003 - MAP - added attribute support, admin:generatorAgent.
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start_admingeneratoragent is an example of how to handle elements with
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only attributes, no content.
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"""
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try:
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import timeoutsocket # http://www.timo-tasi.org/python/timeoutsocket.py
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timeoutsocket.setDefaultSocketTimeout(10)
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except ImportError:
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pass
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import cgi, re, sgmllib, string, StringIO, urllib, gzip
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sgmllib.tagfind = re.compile('[a-zA-Z][-_.:a-zA-Z0-9]*')
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def decodeEntities(data):
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data = data or ''
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data = data.replace('<', '<')
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data = data.replace('>', '>')
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data = data.replace('"', '"')
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data = data.replace(''', "'")
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data = data.replace('&', '&')
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return data
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class RSSParser(sgmllib.SGMLParser):
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namespaces = {"http://backend.userland.com/rss": "",
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"http://backend.userland.com/rss2": "",
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"http://purl.org/rss/1.0/": "",
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"http://purl.org/rss/1.0/modules/textinput/": "ti",
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"http://purl.org/rss/1.0/modules/company/": "co",
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"http://purl.org/rss/1.0/modules/syndication/": "sy",
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"http://purl.org/dc/elements/1.1/": "dc",
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"http://webns.net/mvcb/": "admin"}
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def reset(self):
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self.channel = {}
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self.items = []
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self.elementstack = []
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self.inchannel = 0
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self.initem = 0
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self.namespacemap = {}
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sgmllib.SGMLParser.reset(self)
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def push(self, element, expectingText):
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self.elementstack.append([element, expectingText, []])
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def pop(self, element):
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if not self.elementstack: return
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if self.elementstack[-1][0] != element: return
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element, expectingText, pieces = self.elementstack.pop()
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if not expectingText: return
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output = "".join(pieces)
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output = decodeEntities(output)
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if self.initem:
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self.items[-1][element] = output
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elif self.inchannel:
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self.channel[element] = output
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def _addNamespaces(self, attrs):
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for prefix, value in attrs:
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if not prefix.startswith("xmlns:"): continue
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prefix = prefix[6:]
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if self.namespaces.has_key(value):
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self.namespacemap[prefix] = self.namespaces[value]
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def _mapToStandardPrefix(self, name):
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colonpos = name.find(':')
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if colonpos <> -1:
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prefix = name[:colonpos]
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suffix = name[colonpos+1:]
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prefix = self.namespacemap.get(prefix, prefix)
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name = prefix + ':' + suffix
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return name
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def _getAttribute(self, attrs, name):
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value = [v for k, v in attrs if self._mapToStandardPrefix(k) == name]
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if value:
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value = value[0]
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else:
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value = None
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return value
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def start_channel(self, attrs):
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self.push('channel', 0)
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self.inchannel = 1
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def end_channel(self):
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self.pop('channel')
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self.inchannel = 0
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def start_item(self, attrs):
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self.items.append({})
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self.push('item', 0)
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self.initem = 1
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def end_item(self):
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self.pop('item')
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self.initem = 0
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def start_dc_language(self, attrs):
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self.push('language', 1)
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start_language = start_dc_language
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def end_dc_language(self):
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self.pop('language')
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end_language = end_dc_language
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def start_dc_creator(self, attrs):
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self.push('creator', 1)
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start_managingeditor = start_dc_creator
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start_webmaster = start_dc_creator
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def end_dc_creator(self):
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self.pop('creator')
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end_managingeditor = end_dc_creator
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end_webmaster = end_dc_creator
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def start_dc_rights(self, attrs):
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self.push('rights', 1)
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start_copyright = start_dc_rights
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def end_dc_rights(self):
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self.pop('rights')
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end_copyright = end_dc_rights
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def start_dc_date(self, attrs):
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self.push('date', 1)
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start_lastbuilddate = start_dc_date
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start_pubdate = start_dc_date
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def end_dc_date(self):
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self.pop('date')
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end_lastbuilddate = end_dc_date
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end_pubdate = end_dc_date
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def start_dc_subject(self, attrs):
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self.push('category', 1)
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def end_dc_subject(self):
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self.pop('category')
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def start_link(self, attrs):
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self.push('link', self.inchannel or self.initem)
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def end_link(self):
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self.pop('link')
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def start_guid(self, attrs):
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self.guidislink = ('ispermalink', 'false') not in attrs
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self.push('guid', 1)
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def end_guid(self):
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self.pop('guid')
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if self.guidislink:
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self.items[-1]['link'] = self.items[-1]['guid']
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def start_title(self, attrs):
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self.push('title', self.inchannel or self.initem)
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def start_description(self, attrs):
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self.push('description', self.inchannel or self.initem)
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def start_content_encoded(self, attrs):
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self.push('content_encoded', 1)
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start_fullitem = start_content_encoded
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def end_content_encoded(self):
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self.pop('content_encoded')
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end_fullitem = end_content_encoded
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def start_admin_generatoragent(self, attrs):
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self.push('generator', 1)
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value = self._getAttribute(attrs, 'rdf:resource')
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if value:
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self.elementstack[-1][2].append(value)
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self.pop('generator')
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def unknown_starttag(self, tag, attrs):
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self._addNamespaces(attrs)
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colonpos = tag.find(':')
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if colonpos <> -1:
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prefix = tag[:colonpos]
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suffix = tag[colonpos+1:]
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prefix = self.namespacemap.get(prefix, prefix)
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if prefix:
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prefix = prefix + '_'
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methodname = 'start_' + prefix + suffix
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try:
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method = getattr(self, methodname)
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return method(attrs)
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except AttributeError:
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return self.push(prefix + suffix, 0)
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return self.push(tag, 0)
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def unknown_endtag(self, tag):
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colonpos = tag.find(':')
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if colonpos <> -1:
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prefix = tag[:colonpos]
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suffix = tag[colonpos+1:]
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prefix = self.namespacemap.get(prefix, prefix)
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if prefix:
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prefix = prefix + '_'
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methodname = 'end_' + prefix + suffix
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try:
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method = getattr(self, methodname)
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return method()
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except AttributeError:
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return self.pop(prefix + suffix)
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return self.pop(tag)
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def handle_charref(self, ref):
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# called for each character reference, e.g. for " ", ref will be "160"
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# Reconstruct the original character reference.
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if not self.elementstack: return
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self.elementstack[-1][2].append("&#%(ref)s;" % locals())
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def handle_entityref(self, ref):
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# called for each entity reference, e.g. for "©", ref will be "copy"
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# Reconstruct the original entity reference.
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if not self.elementstack: return
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self.elementstack[-1][2].append("&%(ref)s;" % locals())
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def handle_data(self, text):
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# called for each block of plain text, i.e. outside of any tag and
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# not containing any character or entity references
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if not self.elementstack: return
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self.elementstack[-1][2].append(text)
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def handle_comment(self, text):
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# called for each comment, e.g. <!-- insert message here -->
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pass
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def handle_pi(self, text):
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# called for each processing instruction, e.g. <?instruction>
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pass
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def handle_decl(self, text):
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# called for the DOCTYPE, if present, e.g.
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# <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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# "http://www.w3.org/TR/html4/loose.dtd">
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pass
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_new_declname_match = re.compile(r'[a-zA-Z][-_.a-zA-Z0-9:]*\s*').match
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def _scan_name(self, i, declstartpos):
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rawdata = self.rawdata
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n = len(rawdata)
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if i == n:
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return None, -1
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m = self._new_declname_match(rawdata, i)
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if m:
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s = m.group()
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name = s.strip()
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if (i + len(s)) == n:
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return None, -1 # end of buffer
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return string.lower(name), m.end()
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else:
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self.updatepos(declstartpos, i)
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self.error("expected name token")
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def parse_declaration(self, i):
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# override internal declaration handler to handle CDATA blocks
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if self.rawdata[i:i+9] == '<![CDATA[':
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k = self.rawdata.find(']]>', i)
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if k == -1: k = len(self.rawdata)
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self.handle_data(cgi.escape(self.rawdata[i+9:k]))
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return k+3
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return sgmllib.SGMLParser.parse_declaration(self, i)
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def open_resource(source, etag=None, modified=None, agent=None, referrer=None):
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"""
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URI, filename, or string --> stream
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This function lets you define parsers that take any input source
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(URL, pathname to local or network file, or actual data as a string)
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and deal with it in a uniform manner. Returned object is guaranteed
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to have all the basic stdio read methods (read, readline, readlines).
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Just .close() the object when you're done with it.
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If the etag argument is supplied, it will be used as the value of an
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If-None-Match request header.
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If the modified argument is supplied, it must be a tuple of 9 integers
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as returned by gmtime() in the standard Python time module. This MUST
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be in GMT (Greenwich Mean Time). The formatted date/time will be used
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as the value of an If-Modified-Since request header.
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If the agent argument is supplied, it will be used as the value of a
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User-Agent request header.
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If the referrer argument is supplied, it will be used as the value of a
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Referer[sic] request header.
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The optional arguments are only used if the source argument is an HTTP
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URL and the urllib2 module is importable (i.e., you must be using Python
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version 2.0 or higher).
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"""
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if hasattr(source, "read"):
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return source
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if source == "-":
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return sys.stdin
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# try to open with urllib2 (to use optional headers)
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try:
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import urllib2
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request = urllib2.Request(source)
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if etag:
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request.add_header("If-None-Match", etag)
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if modified:
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request.add_header("If-Modified-Since", format_http_date(modified))
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if agent:
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request.add_header("User-Agent", agent)
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if referrer:
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# http://www.dictionary.com/search?q=referer
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request.add_header("Referer", referrer)
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request.add_header("Accept-encoding", "gzip")
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try:
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return urllib2.urlopen(request)
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except urllib2.HTTPError:
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# either the resource is not modified or some other HTTP
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# error occurred so return an empty resource
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return StringIO.StringIO("")
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except:
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# source must not be a valid URL but it might be a valid filename
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pass
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except ImportError:
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# urllib2 isn't available so try to open with urllib
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try:
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return urllib.urlopen(source)
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except:
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# source still might be a filename
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pass
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# try to open with native open function (if source is a filename)
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try:
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return open(source)
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except:
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pass
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# treat source as string
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return StringIO.StringIO(str(source))
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def get_etag(resource):
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"""
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Get the ETag associated with a response returned from a call to
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open_resource().
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If the resource was not returned from an HTTP server or the server did
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not specify an ETag for the resource, this will return None.
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"""
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if hasattr(resource, "info"):
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return resource.info().getheader("ETag")
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return None
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def get_modified(resource):
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"""
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Get the Last-Modified timestamp for a response returned from a call to
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open_resource().
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If the resource was not returned from an HTTP server or the server did
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not specify a Last-Modified timestamp, this function will return None.
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Otherwise, it returns a tuple of 9 integers as returned by gmtime() in
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the standard Python time module().
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"""
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if hasattr(resource, "info"):
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last_modified = resource.info().getheader("Last-Modified")
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if last_modified:
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return parse_http_date(last_modified)
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return None
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short_weekdays = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
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long_weekdays = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]
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months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
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def format_http_date(date):
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"""
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Formats a tuple of 9 integers into an RFC 1123-compliant timestamp as
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required in RFC 2616. We don't use time.strftime() since the %a and %b
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directives can be affected by the current locale (HTTP dates have to be
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in English). The date MUST be in GMT (Greenwich Mean Time).
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"""
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return "%s, %02d %s %04d %02d:%02d:%02d GMT" % (short_weekdays[date[6]], date[2], months[date[1] - 1], date[0], date[3], date[4], date[5])
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rfc1123_match = re.compile(r"(?P<weekday>[A-Z][a-z]{2}), (?P<day>\d{2}) (?P<month>[A-Z][a-z]{2}) (?P<year>\d{4}) (?P<hour>\d{2}):(?P<minute>\d{2}):(?P<second>\d{2}) GMT").match
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rfc850_match = re.compile(r"(?P<weekday>[A-Z][a-z]+), (?P<day>\d{2})-(?P<month>[A-Z][a-z]{2})-(?P<year>\d{2}) (?P<hour>\d{2}):(?P<minute>\d{2}):(?P<second>\d{2}) GMT").match
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asctime_match = re.compile(r"(?P<weekday>[A-Z][a-z]{2}) (?P<month>[A-Z][a-z]{2}) ?(?P<day>\d\d?) (?P<hour>\d{2}):(?P<minute>\d{2}):(?P<second>\d{2}) (?P<year>\d{4})").match
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def parse_http_date(date):
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"""
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Parses any of the three HTTP date formats into a tuple of 9 integers as
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returned by time.gmtime(). This should not use time.strptime() since
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that function is not available on all platforms and could also be
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affected by the current locale.
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"""
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date = str(date)
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year = 0
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weekdays = short_weekdays
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m = rfc1123_match(date)
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if not m:
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m = rfc850_match(date)
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if m:
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year = 1900
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weekdays = long_weekdays
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else:
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m = asctime_match(date)
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if not m:
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return None
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try:
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year = year + int(m.group("year"))
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month = months.index(m.group("month")) + 1
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day = int(m.group("day"))
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hour = int(m.group("hour"))
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minute = int(m.group("minute"))
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second = int(m.group("second"))
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weekday = weekdays.index(m.group("weekday"))
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a = int((14 - month) / 12)
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julian_day = (day - 32045 + int(((153 * (month + (12 * a) - 3)) + 2) / 5) + int((146097 * (year + 4800 - a)) / 400)) - (int((146097 * (year + 4799)) / 400) - 31738) + 1
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daylight_savings_flag = 0
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return (year, month, day, hour, minute, second, weekday, julian_day, daylight_savings_flag)
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except:
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# the month or weekday lookup probably failed indicating an invalid timestamp
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return None
|
|
|
|
def parse(uri, etag=None, modified=None, agent=None, referrer=None):
|
|
r = RSSParser()
|
|
f = open_resource(uri, etag=etag, modified=modified, agent=agent, referrer=referrer)
|
|
data = f.read()
|
|
if hasattr(f, "headers"):
|
|
if f.headers.get('content-encoding', None) == 'gzip':
|
|
data = gzip.GzipFile(fileobj=StringIO.StringIO(data)).read()
|
|
r.feed(data)
|
|
result = {"channel": r.channel, "items": r.items}
|
|
newEtag = get_etag(f)
|
|
if newEtag: result["etag"] = newEtag
|
|
elif etag: result["etag"] = etag
|
|
newModified = get_modified(f)
|
|
if newModified: result["modified"] = newModified
|
|
elif modified: result["modified"] = modified
|
|
f.close()
|
|
return result
|
|
|
|
TEST_SUITE = ('http://www.pocketsoap.com/rssTests/rss1.0withModules.xml',
|
|
'http://www.pocketsoap.com/rssTests/rss1.0withModulesNoDefNS.xml',
|
|
'http://www.pocketsoap.com/rssTests/rss1.0withModulesNoDefNSLocalNameClash.xml',
|
|
'http://www.pocketsoap.com/rssTests/rss2.0noNSwithModules.xml',
|
|
'http://www.pocketsoap.com/rssTests/rss2.0noNSwithModulesLocalNameClash.xml',
|
|
'http://www.pocketsoap.com/rssTests/rss2.0NSwithModules.xml',
|
|
'http://www.pocketsoap.com/rssTests/rss2.0NSwithModulesNoDefNS.xml',
|
|
'http://www.pocketsoap.com/rssTests/rss2.0NSwithModulesNoDefNSLocalNameClash.xml')
|
|
|
|
if __name__ == '__main__':
|
|
import sys
|
|
if sys.argv[1:]:
|
|
urls = sys.argv[1:]
|
|
else:
|
|
urls = TEST_SUITE
|
|
from pprint import pprint
|
|
for url in urls:
|
|
print url
|
|
print
|
|
result = parse(url)
|
|
pprint(result['channel'])
|
|
print
|