OAuth Gdata Python Client jette stacktrace sur RSA_KEY

Question

Passant de AuthSub à OAuth, je pense que je commence lentement à comprendre le processus. Celui-ci m'a jeté une erreur si:

#!/usr/bin/env python 

from google.appengine.ext import webapp 
from google.appengine.ext.webapp import util 
from google.appengine.ext.webapp import template 
from gdata.calendar import service 
import gdata 
from gdata.alt.appengine import run_on_appengine 

from google.appengine.api import users 
from google.appengine.ext import db 

from gdata.auth import OAuthSignatureMethod, OAuthToken, OAuthInputParams 
import urllib 
import simplejson 

import gdata.gauth 

from google.appengine.runtime.apiproxy_errors import CapabilityDisabledError 

SCOPES = 'https://www.google.com/calendar/feeds/' # in this case just one, but for future reference, just concatenate different scopes with a space in between 
CONSUMER_KEY = 'jmm-timeline.appspot.com' 
CONSUMER_SECRET = 'consumer secret key, here' 
SIG_METHOD = gdata.auth.OAuthSignatureMethod.RSA_SHA1 
f = open('remotekey.pem') 
RSA_KEY = f.read() 
f.close() 


# Incomplete bibliography 
# http://www.youtube.com/watch?v=bfgO-LXGpTM 
# http://code.google.com/appengine/articles/python/retrieving_gdata_feeds.html 


class BasePage(webapp.RequestHandler): 
    title = "Joshua's Construction Zone" 
    def write_page_header(self): 
     self.response.out.write(template.render('templates/header.html', {'title': self.title})) 

    def write_page_footer(self): 
     self.response.out.write(template.render('templates/footer.html', {})) 

class MainHandler(BasePage): 
    def get(self): 

     self.write_page_header() 

     try: 
      client = gdata.calendar.service.CalendarService(source='jmm-timeline-v1') 
      run_on_appengine(client) 
      client.SetOAuthInputParameters(gdata.auth.OAuthSignatureMethod.RSA_SHA1, consumer_key=CONSUMER_KEY, consumer_secret=CONSUMER_SECRET, rsa_key=RSA_KEY) 
      req_token = client.FetchOAuthRequestToken(SCOPES) 
      oauth_callback_url = 'http://jmm-timeline.appspot.com/handle_authorized_request_token' 
      oauth_authorization_url = client.GenerateOAuthAuthorizationURL(callback_url=oauth_callback_url) 
      self.response.out.write(template.render('templates/authorization_prompt.html', { 'authorization_url': oauth_authorization_url })) 
     except CapabilityDisabledError, e: 
      self.response.out.write(template.render('templates/content/maintenance.html')) 

     self.write_page_footer() 

class HandleAuthorizedRequestToken(BasePage): 
    def get(self): 
     self.write_page_header() 

     client = gdata.calendar.service.CalendarService('jmm-timeline-2'); 
     run_on_appengine(client) 


     self.write_page_footer() 

def main(): 
    application = webapp.WSGIApplication([('/', MainHandler), ('/handle_authorized_request_token', HandleAuthorizedRequestToken)], debug=True) 
    util.run_wsgi_app(application) 


if __name__ == '__main__': 
    main() 

Il semble que gdata tente de lire ma chaîne de RSA_KEY, et je reçois un stacktrace:

Traceback (most recent call last): 
    File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\webapp\__init__.py", line 515, in __call__ 
    handler.get(*groups) 
    File "C:\Users\Joshua\appengineapps\jmm-timeline\main.py", line 52, in get 
    req_token = client.FetchOAuthRequestToken(SCOPES) 
    File "C:\Users\Joshua\appengineapps\jmm-timeline\gdata\service.py", line 415, in FetchOAuthRequestToken 
    extra_parameters=extra_parameters) 
    File "C:\Users\Joshua\appengineapps\jmm-timeline\gdata\auth.py", line 217, in GenerateOAuthRequestTokenUrl 
    oauth_input_params.GetConsumer(), None) 
    File "C:\Users\Joshua\appengineapps\jmm-timeline\gdata\oauth\__init__.py", line 171, in sign_request 
    self.set_parameter('oauth_signature', self.build_signature(signature_method, consumer, token)) 
    File "C:\Users\Joshua\appengineapps\jmm-timeline\gdata\oauth\__init__.py", line 175, in build_signature 
    return signature_method.build_signature(self, consumer, token) 
    File "C:\Users\Joshua\appengineapps\jmm-timeline\gdata\oauth\rsa.py", line 55, in build_signature 
    privatekey = keyfactory.parsePrivateKey(cert) 
    File "C:\Users\Joshua\appengineapps\jmm-timeline\gdata\tlslite\utils\keyfactory.py", line 203, in parsePrivateKey 
    return parseXMLKey(s, private=True) 
    File "C:\Users\Joshua\appengineapps\jmm-timeline\gdata\tlslite\utils\keyfactory.py", line 79, in parseXMLKey 
    key = Python_RSAKey.parseXML(s) 
    File "C:\Users\Joshua\appengineapps\jmm-timeline\gdata\tlslite\utils\Python_RSAKey.py", line 137, in parseXML 
    element = xmltools.parseAndStripWhitespace(s) 
    File "C:\Users\Joshua\appengineapps\jmm-timeline\gdata\tlslite\utils\xmltools.py", line 30, in parseAndStripWhitespace 
    raise SyntaxError(str(e)) 
SyntaxError: syntax error: line 1, column 0 

Answer 1

tlslite a deux keyformats: PEM et XML . Il first tries PEM (see parsePrivateKey), puis retombe en XML. Apparemment, il y a une erreur dans votre fichier PEM, donc l'analyse PEM échoue (mais devrait avoir réussi). L'analyse XML doit alors clairement échouer. Je suppose que vous avez foiré les terminaisons de ligne, mais peut-être qu'il y a quelque chose d'encore plus fondamentalement faux dans le fichier PEM.