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AUTHENTICATION_BACKENDS = (
    'social_auth.backends.google.GoogleOAuth2Backend',
#    'social_auth.backends.google.GoogleBackend',
#    'django.contrib.auth.backends.ModelBackend',
)

SOCIAL_AUTH_ENABLED_BACKENDS = ('google-oauth2')
GOOGLE_OAUTH_EXTRA_SCOPE = ['http://www.google.com/m8/feeds', 'http://www.google.com/reader/api/', 'http://www.google.com/reader/atom/', 'https://www.googleapis.com/auth/plus.me']
SOCIAL_AUTH_DEFAULT_USERNAME = 'new_social_auth_user'
SOCIAL_AUTH_UUID_LENGTH = 16
SOCIAL_AUTH_SESSION_EXPIRATION = False
vars()['GOOGLE_OAUTH2_AUTH_EXTRA_ARGUMENTS'] = {'access_type': 'offline', 'approval_prompt': 'auto'}
#SOCIAL_AUTH_SESSION_EXPIRATION = False
SOCIAL_AUTH_ASSOCIATE_BY_MAIL = True