python - Last.fm API invalid method signature but valid when getting session key -


i wanna make python client last.fm api. wanna build kind of library.

i managed , set session getting session key. afterwards, try call post method requires api_key, api_signature , session key. use api key have, same api_signature used session key , session key itself.

but "invalid method signature" though use same api_signature post calls.

import json import webbrowser hashlib import md5 import urllib3  class pylast():  def __init__(self, api_key, secret, session_key=none):     self.__api_key__ = api_key     self.__secret__ = secret     self.__session_key__ = session_key     self.__api_signature__ = none     if session_key none:         self.__is_authorized__ = false     else:         self.__is_authorized__ = true      self.__http__ = urllib3.poolmanager()  def request_token(self):     print("getting token...")     url = 'http://ws.audioscrobbler.com/2.0/?method=auth.gettoken&api_key={}&format=json'.format(self.__api_key__)     req_response = self.__http__.request('get', url, headers={'user-agent' : 'mozilla/5.0'})     if req_response.status == 200:         json_data = json.loads(req_response.data.decode('utf-8'))         token = json_data['token']         self.__token__ = token         return token     else:         print("error code " + req_response.status)  def authorize(self):     if not self.__is_authorized__:         url = 'http://www.last.fm/api/auth/?api_key={}&token={}'.format(self.__api_key__, self.__token__)         # open browser authorize app         webbrowser.open(url, new=0, autoraise=true)         # make sure authorized         self.__is_authorized__ = true   def start_session(self):     if self.__is_authorized__:         data = "api_key{}methodauth.getsessiontoken{}{}" \                                      .format(self.__api_key__, self.__token__, self.__secret__).encode(             encoding='utf-8')         self.__api_signature__ = md5(data).hexdigest()         url = 'http://ws.audioscrobbler.com/2.0/?method=auth.getsession&api_key={}&token={}&api_sig={}&format=json'.format(             self.__api_key__, self.__token__, self.__api_signature__)         req_response = self.__http__.request('get', url)          if req_response.status == 200:             json_data = json.loads(req_response.data.decode('utf-8'))             session_key = json_data['session']['key']             self.__session_key__ = session_key              url = 'http://ws.audioscrobbler.com/2.0/?method=track.love&api_key={}&api_sig={}&sk={}&artist=cher&track=believe&format=json'.format(                 self.__api_key__, self.__api_signature__, self.__session_key__)             req_response = self.__http__.request('post', url)              return self.__session_key__         else:             print("error code " + str(req_response.status))         else:         print("not authorized!")

i found solution. problem was using same parameters used generate session key make post call. right way sign method last.fm api build api_sig post method want use. example, generate api_sig track.love use these parameters:

 data = {"api_key": api_key,                     "method": "track.love",                     "track" : "yellow",                     "artist" :"coldplay",                     "sk" : session_key                     }  keys = sorted(data.keys())  param = [k+data[k] k in keys]  param = "".join(param) + secret  api_sig = md5(param.encode()).hexdigest() # api_sig used sign track.love call.

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