def whereIsYadis(resp):
"""Given a HTTPResponse, return the location of the Yadis document.
May be the URL just retrieved, another URL, or None, if I can't
find any.
[non-blocking]
@returns: str or None
"""
# Attempt to find out where to go to discover the document
# or if we already have it
content_type = resp.headers.get('content-type')
# According to the spec, the content-type header must be an exact
# match, or else we have to look for an indirection.
if (content_type and
content_type.split(';', 1)[0].lower() == YADIS_CONTENT_TYPE):
return resp.final_url
else:
# Try the header
yadis_loc = resp.headers.get(YADIS_HEADER_NAME.lower())
if not yadis_loc:
# Parse as HTML if the header is missing.
#
# XXX: do we want to do something with content-type, like
# have a whitelist or a blacklist (for detecting that it's
# HTML)?
try:
yadis_loc = findHTMLMeta(StringIO(resp.body))
except MetaNotFound:
pass
return yadis_loc
def whereIsYadis(resp):
"""Given a HTTPResponse, return the location of the Yadis document.
May be the URL just retrieved, another URL, or None, if I can't
find any.
[non-blocking]
@returns: str or None
"""
# Attempt to find out where to go to discover the document
# or if we already have it
content_type = resp.headers.get('content-type')
# According to the spec, the content-type header must be an exact
# match, or else we have to look for an indirection.
if (content_type
and content_type.split(';', 1)[0].lower() == YADIS_CONTENT_TYPE):
return resp.final_url
else:
# Try the header
yadis_loc = resp.headers.get(YADIS_HEADER_NAME.lower())
if not yadis_loc:
# Parse as HTML if the header is missing.
#
# XXX: do we want to do something with content-type, like
# have a whitelist or a blacklist (for detecting that it's
# HTML)?
try:
yadis_loc = findHTMLMeta(StringIO(resp.body))
except MetaNotFound:
pass
return yadis_loc
def handle_starttag(self, tag, attrs):
# if we ever see a start body tag, bail out right away, since
# we want to prevent the meta tag from appearing in the body
# [2]
if tag=='body':
self._terminate()
if self.phase == self.TOP:
# At the top level, allow a html tag or a head tag to move
# to the head or html phase
if tag == 'head':
# [3]
self.phase = self.HEAD
elif tag == 'html':
# [4]
self.phase = self.HTML
elif self.phase == self.HTML:
# if we are in the html tag, allow a head tag to move to
# the HEAD phase. If we get another html tag, then bail
# out
if tag == 'head':
# [3]
self.phase = self.HEAD
elif tag == 'html':
# [5]
self._terminate()
elif self.phase == self.HEAD:
# If we are in the head phase, look for the appropriate
# meta tag. If we get a head or body tag, bail out.
if tag == 'meta':
attrs_d = dict(attrs)
http_equiv = attrs_d.get('http-equiv', '').lower()
if http_equiv == YADIS_HEADER_NAME.lower():
raw_attr = attrs_d.get('content')
yadis_loc = substituteEntities(raw_attr)
# [6]
self.phase = self.FOUND
raise ParseDone(yadis_loc)
elif tag in ['head', 'html']:
# [5], [7]
self._terminate()
def handle_starttag(self, tag, attrs):
# if we ever see a start body tag, bail out right away, since
# we want to prevent the meta tag from appearing in the body
# [2]
if tag == 'body':
self._terminate()
if self.phase == self.TOP:
# At the top level, allow a html tag or a head tag to move
# to the head or html phase
if tag == 'head':
# [3]
self.phase = self.HEAD
elif tag == 'html':
# [4]
self.phase = self.HTML
elif self.phase == self.HTML:
# if we are in the html tag, allow a head tag to move to
# the HEAD phase. If we get another html tag, then bail
# out
if tag == 'head':
# [3]
self.phase = self.HEAD
elif tag == 'html':
# [5]
self._terminate()
elif self.phase == self.HEAD:
# If we are in the head phase, look for the appropriate
# meta tag. If we get a head or body tag, bail out.
if tag == 'meta':
attrs_d = dict(attrs)
http_equiv = attrs_d.get('http-equiv', '').lower()
if http_equiv == YADIS_HEADER_NAME.lower():
raw_attr = attrs_d.get('content')
yadis_loc = substituteEntities(raw_attr)
# [6]
self.phase = self.FOUND
raise ParseDone(yadis_loc)
elif tag in ['head', 'html']:
# [5], [7]
self._terminate()
