Facebook authenticator not working

[hpolkowski]

I came across a problem with Facebook authenticator.

Error log:

[ERROR] from controllers.FacebookAuthController in application-akka.actor.default-dispatcher-11 - Failed to retrieve access token. {"access_token":"EAADn...SUu","token_type":"bearer","expires_in":5183538}
jp.t2v.lab.play2.auth.social.core.AccessTokenRetrievalFailedException: Failed to retrieve access token. {"access_token":"EAADn...SUu","token_type":"bearer","expires_in":5183538}
	at jp.t2v.lab.play2.auth.social.providers.facebook.FacebookAuthenticator.parseAccessTokenResponse(FacebookAuthenticator.scala:68)
	at jp.t2v.lab.play2.auth.social.providers.facebook.FacebookAuthenticator$$anonfun$retrieveAccessToken$1.apply(FacebookAuthenticator.scala:42)
	at jp.t2v.lab.play2.auth.social.providers.facebook.FacebookAuthenticator$$anonfun$retrieveAccessToken$1.apply(FacebookAuthenticator.scala:40)
Caused by: scala.MatchError: List({"access_token":"EAADn...SUu","token_type":"bearer","expires_in":5183538}) (of class scala.collection.immutable.$colon$colon)
	at jp.t2v.lab.play2.auth.social.providers.facebook.FacebookAuthenticator$$anonfun$parseAccessTokenResponse$2.apply(FacebookAuthenticator.scala:59)
	at jp.t2v.lab.play2.auth.social.providers.facebook.FacebookAuthenticator$$anonfun$parseAccessTokenResponse$2.apply(FacebookAuthenticator.scala:58)

The problem is that FacebookAuthenticator.scala:59 is decoding response wrong.

params <- response.body.split("&").toList
key :: value :: Nil = params.split("=").toList
if key == "access_token"

The code above is trying to decode this response body in json format:

{"access_token":"EAADn...SUu","token_type":"bearer","expires_in":5182252}