Merge pull request #26 from udacity/remove_dj_version

[osqa.git] / forum_modules / facebookauth / authentication.py

diff --git a/forum_modules/facebookauth/authentication.py b/forum_modules/facebookauth/authentication.py
index b19d79441369fb4239d43cbc1db8adc6a9f9a432..b80c47767ff08846e8b49e960e6c675d30bf5871 100644 (file)
--- a/forum_modules/facebookauth/authentication.py
+++ b/forum_modules/facebookauth/authentication.py
@@ -1,79 +1,77 @@
-import hashlib
-from time import time
-from datetime import datetime
+# -*- coding: utf-8 -*-
+
+import cgi
+import logging
+
 from urllib import urlopen,  urlencode
 from forum.authentication.base import AuthenticationConsumer, ConsumerTemplateContext, InvalidAuthentication
+
+from django.conf import settings as django_settings
+from django.utils.encoding import smart_unicode
 from django.utils.translation import ugettext as _
 
 import settings
 
-try:
-    from json import load as load_json
-except:
-    from django.utils.simplejson import JSONDecoder
+from json import load as load_json
 
-    def load_json(json):
-        decoder = JSONDecoder()
-        return decoder.decode(json.read())
-
-REST_SERVER = 'http://api.facebook.com/restserver.php'
 
 class FacebookAuthConsumer(AuthenticationConsumer):
-    
+
+    def prepare_authentication_request(self, request, redirect_to):
+        args = dict(
+            client_id=settings.FB_API_KEY,
+            redirect_uri="%s%s" % (django_settings.APP_URL, redirect_to),
+            scope="email"
+        )
+
+        facebook_api_authentication_url = "https://graph.facebook.com/oauth/authorize?" + urlencode(args)
+
+        return facebook_api_authentication_url
+
     def process_authentication_request(self, request):
-        API_KEY = str(settings.FB_API_KEY)
-
-        if API_KEY in request.COOKIES:
-            if self.check_cookies_signature(request.COOKIES):
-                if self.check_session_expiry(request.COOKIES):
-                    return request.COOKIES[API_KEY + '_user']
-                else:
-                    raise InvalidAuthentication(_('Sorry, your Facebook session has expired, please try again'))
-            else:
-                raise InvalidAuthentication(_('The authentication with Facebook connect failed due to an invalid signature'))
-        else:
-            raise InvalidAuthentication(_('The authentication with Facebook connect failed, cannot find authentication tokens'))
-
-    def generate_signature(self, values):
-        keys = []
-
-        for key in sorted(values.keys()):
-            keys.append(key)
-
-        signature = ''.join(['%s=%s' % (key,  values[key]) for key in keys]) + str(settings.FB_APP_SECRET)
-        return hashlib.md5(signature).hexdigest()
-
-    def check_session_expiry(self, cookies):
-        return datetime.fromtimestamp(float(cookies[settings.FB_API_KEY+'_expires'])) > datetime.now()
-
-    def check_cookies_signature(self, cookies):
-        API_KEY = str(settings.FB_API_KEY)
-
-        values = {}
-
-        for key in cookies.keys():
-            if (key.startswith(API_KEY + '_')):
-                values[key.replace(API_KEY + '_',  '')] = cookies[key]
-
-        return self.generate_signature(values) == cookies[API_KEY]
-
-    def get_user_data(self, key):
-        request_data = {
-            'method': 'Users.getInfo',
-            'api_key': settings.FB_API_KEY,
-            'call_id': time(),
-            'v': '1.0',
-            'uids': key,
-            'fields': 'name,first_name,last_name,email',
-            'format': 'json',
-        }
+        try:
+            args = dict(client_id=settings.FB_API_KEY, redirect_uri="%s%s" % (django_settings.APP_URL, request.path))
+
+            args["client_secret"] = settings.FB_APP_SECRET  #facebook APP Secret
+
+            args["code"] = request.GET.get("code", None)
+            response = cgi.parse_qs(urlopen("https://graph.facebook.com/oauth/access_token?" + urlencode(args)).read())
+            access_token = response["access_token"][-1]
+
+
+            user_data = self.get_user_data(access_token)
+            assoc_key = user_data["id"]
+
+            # Store the access token in cookie
+            request.session["access_token"] = access_token
+            request.session["assoc_key"] = assoc_key
+
+            # Return the association key
+            return assoc_key
+        except Exception, e:
+            logging.error("Problem during facebook authentication: %s" % e)
+            raise InvalidAuthentication(_("Something wrond happened during Facebook authentication, administrators will be notified"))
+
+    def get_user_data(self, access_token):
+        profile = load_json(urlopen("https://graph.facebook.com/me?" + urlencode(dict(access_token=access_token))))
+
+        name = profile["name"]
+
+        # Check whether the length if the email is greater than 75, if it is -- just replace the email
+        # with a blank string variable, otherwise we're going to have trouble with the Django model.
+        email = smart_unicode(profile['email'])
+        if len(email) > 75:
+            email = ''
 
-        request_data['sig'] = self.generate_signature(request_data)
-        fb_response = load_json(urlopen(REST_SERVER, urlencode(request_data)))[0]
+        # If the name is longer than 30 characters - leave it blank
+        if len(name) > 30:
+            name = ''
 
+        # Return the user data.
         return {
-            'username': fb_response['first_name'] + ' ' + fb_response['last_name'],
-            'email': fb_response['email']
+            'id' : profile['id'],
+            'username': name,
+            'email': email,
         }
 
 class FacebookAuthContext(ConsumerTemplateContext):
@@ -82,6 +80,6 @@ class FacebookAuthContext(ConsumerTemplateContext):
     weight = 100
     human_name = 'Facebook'
     code_template = 'modules/facebookauth/button.html'
-    extra_css = ["http://www.facebook.com/css/connect/connect_button.css"]
+    extra_css = []
 
-    API_KEY = settings.FB_API_KEY
\ No newline at end of file
+    API_KEY = settings.FB_API_KEY