h/plugins/util/http.py

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# convenience wrapper for urllib2 & friends
import binascii
import cookielib
import hmac
import json
import random
import string
import time
import urllib
import urllib2
import urlparse
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from hashlib import sha1
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from urllib import quote, unquote, quote_plus as _quote_plus
from urllib2 import HTTPError, URLError
from lxml import etree, html
ua_skybot = 'Skybot/1.0 http://github.com/rmmh/skybot'
ua_firefox = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) ' \
'Gecko/20070725 Firefox/2.0.0.6'
ua_internetexplorer = 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)'
jar = cookielib.CookieJar()
def get(*args, **kwargs):
return open(*args, **kwargs).read()
def get_html(*args, **kwargs):
return html.fromstring(get(*args, **kwargs))
def get_xml(*args, **kwargs):
return etree.fromstring(get(*args, **kwargs))
def get_json(*args, **kwargs):
return json.loads(get(*args, **kwargs))
def open(url, query_params=None, post_data=None,
get_method=None, cookies=False, oauth=False, oauth_keys=None, headers=None, **kwargs):
if query_params is None:
query_params = {}
query_params.update(kwargs)
url = prepare_url(url, query_params)
request = urllib2.Request(url, post_data)
if get_method is not None:
request.get_method = lambda: get_method
if headers is not None:
for header_key, header_value in headers.iteritems():
request.add_header(header_key, header_value)
if 'User-Agent' not in request.headers:
request.add_header('User-Agent', ua_skybot)
if oauth:
nonce = oauth_nonce()
timestamp = oauth_timestamp()
api_url, req_data = string.split(url, "?")
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unsigned_request = oauth_unsigned_request(
nonce, timestamp, req_data, oauth_keys['consumer'], oauth_keys['access'])
signature = oauth_sign_request("GET", api_url, req_data, unsigned_request, oauth_keys[
'consumer_secret'], oauth_keys['access_secret'])
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header = oauth_build_header(
nonce, signature, timestamp, oauth_keys['consumer'], oauth_keys['access'])
request.add_header('Authorization', header)
if cookies:
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(jar))
else:
opener = urllib2.build_opener()
return opener.open(request)
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def prepare_url(url, queries):
if queries:
scheme, netloc, path, query, fragment = urlparse.urlsplit(url)
query = dict(urlparse.parse_qsl(query))
query.update(queries)
query = urllib.urlencode(dict((to_utf8(key), to_utf8(value))
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for key, value in query.iteritems()))
url = urlparse.urlunsplit((scheme, netloc, path, query, fragment))
return url
def to_utf8(s):
if isinstance(s, unicode):
return s.encode('utf8', 'ignore')
else:
return str(s)
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def quote_plus(s):
return _quote_plus(to_utf8(s))
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def oauth_nonce():
return ''.join([str(random.randint(0, 9)) for i in range(8)])
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def oauth_timestamp():
return str(int(time.time()))
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def oauth_unsigned_request(nonce, timestamp, req, consumer, token):
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d = {'oauth_consumer_key': consumer,
'oauth_nonce': nonce,
'oauth_signature_method': 'HMAC-SHA1',
'oauth_timestamp': timestamp,
'oauth_token': token,
'oauth_version': '1.0'}
k, v = string.split(req, "=")
d[k] = v
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unsigned_req = ''
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for x in sorted(d, key=lambda key: key):
unsigned_req += x + "=" + d[x] + "&"
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unsigned_req = quote(unsigned_req[:-1])
return unsigned_req
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def oauth_build_header(nonce, signature, timestamp, consumer, token):
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d = {'oauth_consumer_key': consumer,
'oauth_nonce': nonce,
'oauth_signature': signature,
'oauth_signature_method': 'HMAC-SHA1',
'oauth_timestamp': timestamp,
'oauth_token': token,
'oauth_version': '1.0'}
header = 'OAuth '
for x in sorted(d, key=lambda key: key):
header += x + '="' + d[x] + '", '
return header[:-1]
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def oauth_sign_request(method, url, params, unsigned_request, consumer_secret, token_secret):
key = consumer_secret + "&" + token_secret
base = method + "&" + quote(url, '') + "&" + unsigned_request
hash = hmac.new(key, base, sha1)
signature = quote(binascii.b2a_base64(hash.digest())[:-1])
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return signature
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def unescape(s):
if not s.strip():
return s
return html.fromstring(s).text_content()