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# gLifestream Copyright (C) 2009, 2010, 2012 Wojciech Polak
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 3 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
import re
import base64
import httplib
import urllib
import urllib2
import urlparse
from email.utils import parsedate
from django.conf import settings
from glifestream.gauth import gls_oauth
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
try:
import gzip
except ImportError:
gzip = None
try:
import zlib
except ImportError:
zlib = None
AGENT = 'Mozilla/5.0 (compatible; gLifestream; +%s/)' % settings.BASE_URL
class URLopener (urllib.FancyURLopener):
version = AGENT
class HTTPError (urllib2.HTTPError):
pass
def head(host, url='/', timeout=15):
con = httplib.HTTPConnection(host, timeout=timeout)
con.request('HEAD', url)
return con.getresponse()
def get(host, url='/', headers={}, etag=None, timeout=45, https=False):
_headers = {'User-Agent': AGENT}
if gzip and zlib:
_headers['Accept-Encoding'] = 'gzip, deflate'
elif gzip:
_headers['Accept-Encoding'] = 'gzip'
elif zlib:
_headers['Accept-Encoding'] = 'deflate'
if etag:
_headers['If-None-Match'] = etag
_headers.update(headers)
if https:
con = httplib.HTTPSConnection(host, timeout=timeout)
else:
con = httplib.HTTPConnection(host, timeout=timeout)
con.request('GET', url, headers=_headers)
r = con.getresponse()
r.code = r.status
r.data = __decompress(r.read(),
r.getheader('content-encoding', ''))
modified = r.getheader('last-modified')
r.modified = parsedate(modified) if modified else None
r.etag = r.getheader('etag')
return r
def retrieve(url, filename):
opener = URLopener()
return opener.retrieve(url, filename)[1]
def urlopen(url, data=None, headers={}, etag=None, timeout=45):
_headers = {'User-Agent': AGENT}
if gzip and zlib:
_headers['Accept-Encoding'] = 'gzip, deflate'
elif gzip:
_headers['Accept-Encoding'] = 'gzip'
elif zlib:
_headers['Accept-Encoding'] = 'deflate'
if etag:
_headers['If-None-Match'] = etag
_headers.update(headers)
if not url.startswith('http'):
url = 'http://' + url
if data:
data = urllib.urlencode(data)
req = urllib2.Request(url, data, _headers)
try:
f = urllib2.urlopen(req, timeout=timeout)
f.status = f.code
f.data = __decompress(f.read(),
f.headers.get('content-encoding', ''))
modified = f.headers.get('last-modified')
f.modified = parsedate(modified) if modified else None
f.etag = f.headers.get('etag')
return f
except urllib2.HTTPError, e:
raise HTTPError(e.url, e.code, e.msg, e.hdrs, e.fp)
def get_alturl_if_html(r):
"""Return alternate URL (using feed autodiscovery mechanism)
if urlopen's Content-Type response is HTML."""
ct = r.headers.get('content-type', '')
if ';' in ct:
ct = ct.split(';', 1)[0]
if ct in ('text/html', 'application/xhtml+xml'):
shortdata = r.data[:2048]
for link in re.findall(r'<link(.*?)>', shortdata):
if 'alternate' in link:
rx = re.search('type=[\'"](.*?)[\'"]', link)
if not rx:
continue
alt_type = rx.groups()[0]
if alt_type in ('application/rss+xml',
'application/atom+xml',
'application/rdf+xml',
'application/xml'):
rx = re.search('href=[\'"](.*?)[\'"]', link)
if rx:
alt_href = rx.groups()[0]
return urlparse.urljoin(r.url, alt_href)
return None
def gen_auth_hs(service, url):
"""Generate authentication headers."""
if service.creds and len(service.creds) and service.creds != 'oauth':
return {'Authorization': 'Basic ' +
base64.encodestring(service.creds).strip()}
elif service.creds == 'oauth':
client = gls_oauth.Client(service)
return client.sign_request(url).to_header()
return {}
def __decompress(data, encoding):
if gzip and encoding == 'gzip':
try:
return gzip.GzipFile(fileobj=StringIO(data)).read()
except:
pass
elif zlib and encoding == 'deflate':
try:
return zlib.decompress(data, -zlib.MAX_WBITS)
except:
pass
return data
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