author | Sverre Rabbelier <srabbelier@gmail.com> |
Sun, 02 Nov 2008 17:26:06 +0000 | |
changeset 429 | e50e18936f06 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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Syndication feed generation library -- used for generating RSS, etc. |
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|
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Sample usage: |
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|
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>>> from django.utils import feedgenerator |
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>>> feed = feedgenerator.Rss201rev2Feed( |
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... title=u"Poynter E-Media Tidbits", |
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... link=u"http://www.poynter.org/column.asp?id=31", |
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... description=u"A group weblog by the sharpest minds in online media/journalism/publishing.", |
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... language=u"en", |
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... ) |
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>>> feed.add_item(title="Hello", link=u"http://www.holovaty.com/test/", description="Testing.") |
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>>> fp = open('test.rss', 'w') |
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>>> feed.write(fp, 'utf-8') |
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>>> fp.close() |
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|
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For definitions of the different versions of RSS, see: |
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http://diveintomark.org/archives/2004/02/04/incompatible-rss |
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""" |
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import re |
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import datetime |
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from django.utils.xmlutils import SimplerXMLGenerator |
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from django.utils.encoding import force_unicode, iri_to_uri |
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def rfc2822_date(date): |
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# We do this ourselves to be timezone aware, email.Utils is not tz aware. |
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if date.tzinfo: |
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time_str = date.strftime('%a, %d %b %Y %H:%M:%S ') |
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offset = date.tzinfo.utcoffset(date) |
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timezone = (offset.days * 24 * 60) + (offset.seconds / 60) |
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hour, minute = divmod(timezone, 60) |
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return time_str + "%+03d%02d" % (hour, minute) |
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else: |
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return date.strftime('%a, %d %b %Y %H:%M:%S -0000') |
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def rfc3339_date(date): |
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if date.tzinfo: |
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time_str = date.strftime('%Y-%m-%dT%H:%M:%S') |
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offset = date.tzinfo.utcoffset(date) |
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timezone = (offset.days * 24 * 60) + (offset.seconds / 60) |
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hour, minute = divmod(timezone, 60) |
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return time_str + "%+03d:%02d" % (hour, minute) |
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else: |
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return date.strftime('%Y-%m-%dT%H:%M:%SZ') |
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def get_tag_uri(url, date): |
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"Creates a TagURI. See http://diveintomark.org/archives/2004/05/28/howto-atom-id" |
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tag = re.sub('^http://', '', url) |
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if date is not None: |
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tag = re.sub('/', ',%s:/' % date.strftime('%Y-%m-%d'), tag, 1) |
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tag = re.sub('#', '/', tag) |
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return u'tag:' + tag |
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class SyndicationFeed(object): |
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"Base class for all syndication feeds. Subclasses should provide write()" |
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def __init__(self, title, link, description, language=None, author_email=None, |
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author_name=None, author_link=None, subtitle=None, categories=None, |
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feed_url=None, feed_copyright=None, feed_guid=None, ttl=None, **kwargs): |
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to_unicode = lambda s: force_unicode(s, strings_only=True) |
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if categories: |
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categories = [force_unicode(c) for c in categories] |
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self.feed = { |
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'title': to_unicode(title), |
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'link': iri_to_uri(link), |
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'description': to_unicode(description), |
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'language': to_unicode(language), |
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'author_email': to_unicode(author_email), |
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'author_name': to_unicode(author_name), |
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'author_link': iri_to_uri(author_link), |
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'subtitle': to_unicode(subtitle), |
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'categories': categories or (), |
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'feed_url': iri_to_uri(feed_url), |
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'feed_copyright': to_unicode(feed_copyright), |
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'id': feed_guid or link, |
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'ttl': ttl, |
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} |
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self.feed.update(kwargs) |
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self.items = [] |
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def add_item(self, title, link, description, author_email=None, |
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author_name=None, author_link=None, pubdate=None, comments=None, |
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unique_id=None, enclosure=None, categories=(), item_copyright=None, |
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ttl=None, **kwargs): |
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""" |
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Adds an item to the feed. All args are expected to be Python Unicode |
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objects except pubdate, which is a datetime.datetime object, and |
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enclosure, which is an instance of the Enclosure class. |
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""" |
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to_unicode = lambda s: force_unicode(s, strings_only=True) |
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if categories: |
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categories = [to_unicode(c) for c in categories] |
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item = { |
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'title': to_unicode(title), |
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'link': iri_to_uri(link), |
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'description': to_unicode(description), |
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'author_email': to_unicode(author_email), |
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'author_name': to_unicode(author_name), |
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'author_link': iri_to_uri(author_link), |
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'pubdate': pubdate, |
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'comments': to_unicode(comments), |
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'unique_id': to_unicode(unique_id), |
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'enclosure': enclosure, |
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'categories': categories or (), |
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'item_copyright': to_unicode(item_copyright), |
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'ttl': ttl, |
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} |
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109 |
item.update(kwargs) |
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110 |
self.items.append(item) |
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111 |
|
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112 |
def num_items(self): |
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return len(self.items) |
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114 |
|
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115 |
def root_attributes(self): |
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116 |
""" |
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117 |
Return extra attributes to place on the root (i.e. feed/channel) element. |
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118 |
Called from write(). |
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119 |
""" |
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120 |
return {} |
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121 |
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122 |
def add_root_elements(self, handler): |
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123 |
""" |
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124 |
Add elements in the the root (i.e. feed/channel) element. Called |
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125 |
from write(). |
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126 |
""" |
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127 |
pass |
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128 |
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129 |
def item_attributes(self, item): |
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130 |
""" |
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131 |
Return extra attributes to place on each item (i.e. item/entry) element. |
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132 |
""" |
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133 |
return {} |
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134 |
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135 |
def add_item_elements(self, handler, item): |
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136 |
""" |
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137 |
Add elements on each item (i.e. item/entry) element. |
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138 |
""" |
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139 |
pass |
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140 |
|
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141 |
def write(self, outfile, encoding): |
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142 |
""" |
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143 |
Outputs the feed in the given encoding to outfile, which is a file-like |
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144 |
object. Subclasses should override this. |
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145 |
""" |
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146 |
raise NotImplementedError |
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147 |
|
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148 |
def writeString(self, encoding): |
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149 |
""" |
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150 |
Returns the feed in the given encoding as a string. |
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151 |
""" |
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152 |
from StringIO import StringIO |
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153 |
s = StringIO() |
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154 |
self.write(s, encoding) |
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155 |
return s.getvalue() |
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156 |
|
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157 |
def latest_post_date(self): |
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158 |
""" |
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159 |
Returns the latest item's pubdate. If none of them have a pubdate, |
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160 |
this returns the current date/time. |
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161 |
""" |
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162 |
updates = [i['pubdate'] for i in self.items if i['pubdate'] is not None] |
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163 |
if len(updates) > 0: |
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164 |
updates.sort() |
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165 |
return updates[-1] |
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166 |
else: |
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167 |
return datetime.datetime.now() |
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168 |
|
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169 |
class Enclosure(object): |
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170 |
"Represents an RSS enclosure" |
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171 |
def __init__(self, url, length, mime_type): |
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"All args are expected to be Python Unicode objects" |
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self.length, self.mime_type = length, mime_type |
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174 |
self.url = iri_to_uri(url) |
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175 |
|
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176 |
class RssFeed(SyndicationFeed): |
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177 |
mime_type = 'application/rss+xml' |
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178 |
def write(self, outfile, encoding): |
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179 |
handler = SimplerXMLGenerator(outfile, encoding) |
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180 |
handler.startDocument() |
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181 |
handler.startElement(u"rss", self.rss_attributes()) |
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182 |
handler.startElement(u"channel", self.root_attributes()) |
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183 |
self.add_root_elements(handler) |
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184 |
self.write_items(handler) |
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185 |
self.endChannelElement(handler) |
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186 |
handler.endElement(u"rss") |
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187 |
|
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188 |
def rss_attributes(self): |
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189 |
return {u"version": self._version} |
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190 |
|
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191 |
def write_items(self, handler): |
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192 |
for item in self.items: |
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193 |
handler.startElement(u'item', self.item_attributes(item)) |
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194 |
self.add_item_elements(handler, item) |
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195 |
handler.endElement(u"item") |
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196 |
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197 |
def add_root_elements(self, handler): |
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198 |
handler.addQuickElement(u"title", self.feed['title']) |
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199 |
handler.addQuickElement(u"link", self.feed['link']) |
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200 |
handler.addQuickElement(u"description", self.feed['description']) |
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201 |
if self.feed['language'] is not None: |
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202 |
handler.addQuickElement(u"language", self.feed['language']) |
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203 |
for cat in self.feed['categories']: |
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204 |
handler.addQuickElement(u"category", cat) |
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205 |
if self.feed['feed_copyright'] is not None: |
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206 |
handler.addQuickElement(u"copyright", self.feed['feed_copyright']) |
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207 |
handler.addQuickElement(u"lastBuildDate", rfc2822_date(self.latest_post_date()).decode('utf-8')) |
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208 |
if self.feed['ttl'] is not None: |
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209 |
handler.addQuickElement(u"ttl", self.feed['ttl']) |
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210 |
|
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211 |
def endChannelElement(self, handler): |
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212 |
handler.endElement(u"channel") |
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213 |
|
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214 |
class RssUserland091Feed(RssFeed): |
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215 |
_version = u"0.91" |
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216 |
def add_item_elements(self, handler, item): |
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217 |
handler.addQuickElement(u"title", item['title']) |
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218 |
handler.addQuickElement(u"link", item['link']) |
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219 |
if item['description'] is not None: |
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handler.addQuickElement(u"description", item['description']) |
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class Rss201rev2Feed(RssFeed): |
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223 |
# Spec: http://blogs.law.harvard.edu/tech/rss |
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_version = u"2.0" |
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def add_item_elements(self, handler, item): |
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handler.addQuickElement(u"title", item['title']) |
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handler.addQuickElement(u"link", item['link']) |
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if item['description'] is not None: |
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handler.addQuickElement(u"description", item['description']) |
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231 |
# Author information. |
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if item["author_name"] and item["author_email"]: |
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handler.addQuickElement(u"author", "%s (%s)" % \ |
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(item['author_email'], item['author_name'])) |
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elif item["author_email"]: |
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handler.addQuickElement(u"author", item["author_email"]) |
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elif item["author_name"]: |
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handler.addQuickElement(u"dc:creator", item["author_name"], {"xmlns:dc": u"http://purl.org/dc/elements/1.1/"}) |
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|
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if item['pubdate'] is not None: |
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handler.addQuickElement(u"pubDate", rfc2822_date(item['pubdate']).decode('utf-8')) |
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if item['comments'] is not None: |
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handler.addQuickElement(u"comments", item['comments']) |
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if item['unique_id'] is not None: |
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handler.addQuickElement(u"guid", item['unique_id']) |
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if item['ttl'] is not None: |
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handler.addQuickElement(u"ttl", item['ttl']) |
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|
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249 |
# Enclosure. |
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|
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if item['enclosure'] is not None: |
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handler.addQuickElement(u"enclosure", '', |
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{u"url": item['enclosure'].url, u"length": item['enclosure'].length, |
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u"type": item['enclosure'].mime_type}) |
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254 |
|
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255 |
# Categories. |
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for cat in item['categories']: |
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handler.addQuickElement(u"category", cat) |
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class Atom1Feed(SyndicationFeed): |
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# Spec: http://atompub.org/2005/07/11/draft-ietf-atompub-format-10.html |
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mime_type = 'application/atom+xml' |
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ns = u"http://www.w3.org/2005/Atom" |
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|
263 |
|
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def write(self, outfile, encoding): |
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handler = SimplerXMLGenerator(outfile, encoding) |
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handler.startDocument() |
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handler.startElement(u'feed', self.root_attributes()) |
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self.add_root_elements(handler) |
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self.write_items(handler) |
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handler.endElement(u"feed") |
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|
271 |
|
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|
272 |
def root_attributes(self): |
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if self.feed['language'] is not None: |
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return {u"xmlns": self.ns, u"xml:lang": self.feed['language']} |
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else: |
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return {u"xmlns": self.ns} |
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|
277 |
|
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|
278 |
def add_root_elements(self, handler): |
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handler.addQuickElement(u"title", self.feed['title']) |
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handler.addQuickElement(u"link", "", {u"rel": u"alternate", u"href": self.feed['link']}) |
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281 |
if self.feed['feed_url'] is not None: |
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handler.addQuickElement(u"link", "", {u"rel": u"self", u"href": self.feed['feed_url']}) |
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|
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handler.addQuickElement(u"id", self.feed['id']) |
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|
284 |
handler.addQuickElement(u"updated", rfc3339_date(self.latest_post_date()).decode('utf-8')) |
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|
285 |
if self.feed['author_name'] is not None: |
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|
286 |
handler.startElement(u"author", {}) |
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|
287 |
handler.addQuickElement(u"name", self.feed['author_name']) |
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|
288 |
if self.feed['author_email'] is not None: |
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|
289 |
handler.addQuickElement(u"email", self.feed['author_email']) |
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|
290 |
if self.feed['author_link'] is not None: |
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|
291 |
handler.addQuickElement(u"uri", self.feed['author_link']) |
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|
292 |
handler.endElement(u"author") |
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|
293 |
if self.feed['subtitle'] is not None: |
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|
294 |
handler.addQuickElement(u"subtitle", self.feed['subtitle']) |
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|
295 |
for cat in self.feed['categories']: |
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handler.addQuickElement(u"category", "", {u"term": cat}) |
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297 |
if self.feed['feed_copyright'] is not None: |
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298 |
handler.addQuickElement(u"rights", self.feed['feed_copyright']) |
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299 |
|
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|
300 |
def write_items(self, handler): |
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301 |
for item in self.items: |
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302 |
handler.startElement(u"entry", self.item_attributes(item)) |
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303 |
self.add_item_elements(handler, item) |
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304 |
handler.endElement(u"entry") |
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|
305 |
|
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|
306 |
def add_item_elements(self, handler, item): |
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307 |
handler.addQuickElement(u"title", item['title']) |
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308 |
handler.addQuickElement(u"link", u"", {u"href": item['link'], u"rel": u"alternate"}) |
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309 |
if item['pubdate'] is not None: |
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|
310 |
handler.addQuickElement(u"updated", rfc3339_date(item['pubdate']).decode('utf-8')) |
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311 |
|
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|
312 |
# Author information. |
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|
313 |
if item['author_name'] is not None: |
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|
314 |
handler.startElement(u"author", {}) |
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|
315 |
handler.addQuickElement(u"name", item['author_name']) |
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|
316 |
if item['author_email'] is not None: |
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|
317 |
handler.addQuickElement(u"email", item['author_email']) |
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|
318 |
if item['author_link'] is not None: |
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|
319 |
handler.addQuickElement(u"uri", item['author_link']) |
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|
320 |
handler.endElement(u"author") |
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|
321 |
|
323
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|
322 |
# Unique ID. |
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if item['unique_id'] is not None: |
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unique_id = item['unique_id'] |
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325 |
else: |
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unique_id = get_tag_uri(item['link'], item['pubdate']) |
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handler.addQuickElement(u"id", unique_id) |
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328 |
|
323
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329 |
# Summary. |
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if item['description'] is not None: |
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handler.addQuickElement(u"summary", item['description'], {u"type": u"html"}) |
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332 |
|
323
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333 |
# Enclosure. |
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334 |
if item['enclosure'] is not None: |
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335 |
handler.addQuickElement(u"link", '', |
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336 |
{u"rel": u"enclosure", |
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u"href": item['enclosure'].url, |
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u"length": item['enclosure'].length, |
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339 |
u"type": item['enclosure'].mime_type}) |
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340 |
|
323
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341 |
# Categories. |
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for cat in item['categories']: |
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handler.addQuickElement(u"category", u"", {u"term": cat}) |
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344 |
|
323
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345 |
# Rights. |
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346 |
if item['item_copyright'] is not None: |
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347 |
handler.addQuickElement(u"rights", item['item_copyright']) |
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|
348 |
|
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349 |
# This isolates the decision of what the system default is, so calling code can |
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|
350 |
# do "feedgenerator.DefaultFeed" instead of "feedgenerator.Rss201rev2Feed". |
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|
351 |
DefaultFeed = Rss201rev2Feed |