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# vim: set filencoding=utf8
"""
Atom Feed Writer
@author: Mike Crute (mike@crute.us)
@date: June 04, 2010
"""
from io import StringIO
from xml.sax.saxutils import XMLGenerator
class SimpleXMLGenerator(XMLGenerator):
def __init__(self, encoding="utf-8"):
self.output = StringIO()
XMLGenerator.__init__(self, out=self.output, encoding=encoding)
def get_contents(self):
return self.output.getvalue()
def startElement(self, tag, attrs=None):
attrs = attrs if attrs else {}
return XMLGenerator.startElement(self, tag, attrs)
def addElement(self, tag, contents=None, attrs=None):
attrs = attrs if attrs else {}
self.startElement(tag, attrs)
if contents:
self.characters(contents)
self.endElement(tag)
class Atom1Feed(object):
def __init__(self, posts, title, feed_url, updated, blog_url,
post_filter=None):
self.posts = posts
self.title = title
self.feed_url = feed_url
self.updated = updated
self.blog_url = blog_url
self.handler = SimpleXMLGenerator()
if not post_filter:
post_filter = lambda post: True
self.post_filter = post_filter
def _format_time(self, timeobj):
return timeobj.strftime("%Y-%m-%dT%H:%M:%SZ")
def get_feed(self):
self.handler.startDocument()
self.handler.startElement("feed", {
"xmlns": "http://www.w3.org/2005/Atom" })
self.add_root_elements()
for post in self.posts:
if not self.post_filter(post):
continue
self.add_post(post)
self.handler.endElement("feed")
return self.handler.get_contents()
def add_root_elements(self):
self.handler.addElement("title", self.title)
self.handler.addElement("updated", self._format_time(self.updated))
self.handler.addElement("id", self.feed_url)
self.handler.addElement("link", attrs={
"rel": "alternate",
"type": "text/html",
"href": self.blog_url })
self.handler.addElement("link", attrs={
"rel": "self",
"type": "application/atom+xml",
"href": self.feed_url })
def add_post(self, post):
handler = self.handler
handler.startElement("entry")
handler.startElement("author")
handler.addElement("name", post.author.name)
handler.addElement("email", post.author.email)
handler.endElement("author")
post_href = "{0}/{1}".format(self.blog_url, post.filename)
handler.addElement("title", post.title)
handler.addElement("link", attrs={
"rel": "alternate",
"type": "text/html",
"href": post_href })
handler.addElement("id", post_href)
handler.addElement("updated", self._format_time(post.post_date))
handler.addElement("published", self._format_time(post.post_date))
for tag in post.tags:
handler.addElement("category", attrs={ "term": tag })
handler.addElement("content", post.contents, attrs={ "type": "html" })
handler.endElement("entry")
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