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#### PATTERN | WEB | OAUTH #########################################################################
# -*- coding: utf-8 -*-
# Copyright (c) 2010 University of Antwerp, Belgium
# Author: Tom De Smedt <tom@organisms.be>
# License: BSD (see LICENSE.txt for details).
# http://www.clips.ua.ac.be/pages/pattern
####################################################################################################
# Naive OAuth implementation for pattern.web.Yahoo and Yahoo! BOSS v2.
import urllib
import hmac
import time
import random
import base64
try:
from hashlib import sha1
from hashlib import md5
except:
import sha as sha1
import md5; md5=md5.new
_diacritics = {
"a": ("á","ä","â","à","å"),
"e": ("é","ë","ê","è"),
"i": ("í","ï","î","ì"),
"o": ("ó","ö","ô","ò","ō","ø"),
"u": ("ú","ü","û","ù","ů"),
"y": ("ý","ÿ","ý"),
"s": ("š",),
"c": ("ç","č"),
"n": ("ñ",),
"z": ("ž",)
}
####################################################################################################
def HMAC_SHA1(key, text):
return hmac.new(key, text, sha1).digest()
def nonce():
return md5(str(time.time()) + str(random.random())).hexdigest()
def timestamp():
return int(time.time())
def escape(string):
return urllib.quote(string, safe="~")
def utf8(string):
return isinstance(string, unicode) and string.encode("utf-8") or str(string)
def normalize(string):
# Normalize accents (é => e) for services that have problems with utf-8
# (used to be the case with Yahoo BOSS but this appears to be fixed now).
string = utf8(string)
for k, v in _diacritics.items():
for v in v:
string = string.replace(v, k)
return string
def base(url, data={}, method="GET"):
# Signature base string: http://tools.ietf.org/html/rfc5849#section-3.4.1
base = escape(utf8(method.upper())) + "&"
base += escape(utf8(url.rstrip("?"))) + "&"
base += escape(utf8("&".join(["%s=%s" % (
escape(utf8(k)),
escape(utf8(v))) for k, v in sorted(data.items())])))
return base
def sign(url, data={}, method="GET", secret="", token="", hash=HMAC_SHA1):
# HMAC-SHA1 signature algorithm: http://tools.ietf.org/html/rfc5849#section-3.4.2
signature = escape(utf8(secret)) + "&" + escape(utf8(token))
signature = hash(signature, base(url, data, method))
signature = base64.b64encode(signature)
return signature
#CONSUMER_KEY = ""
#CONSUMER_SECRET = ""
#
#q = "cats"
#url = "http://yboss.yahooapis.com/ysearch/web"
#data = {
# "q": normalize(q),
# "start": 0,
# "count": 50,
# "format": "json",
# "oauth_version": "1.0",
# "oauth_nonce": nonce(),
# "oauth_timestamp": timestamp(),
# "oauth_consumer_key": CONSUMER_KEY,
# "oauth_signature_method": "HMAC-SHA1"
#}
#data["oauth_signature"] = sign(url, data, secret=CONSUMER_SECRET)
#data = dict((k, utf8(v)) for k, v in data.items())
#
#print(url + "?" + urllib.urlencode(data))
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