Connecting Facebook OAuth with Akka REST...

fboauthakka.scala

/**
 * Garrick Evans
 * 29 Dec 2010
 */

import akka.http._
import akka.actor._
import net.smartam.leeloo.client._
import net.smartam.leeloo.client.request.OAuthClientRequest
import net.smartam.leeloo.client.response. {OAuthAuthzResponse, GitHubTokenResponse}
import net.smartam.leeloo.common.message.types.GrantType



class Service extends Actor with Endpoint
{
  def hook(uri:String) = uri contains ".html"
  def provide(uri:String) = Actor.actorOf[PageActor].start

  override def preStart =
  {
    ActorRegistry.actorsFor(classOf[RootEndpoint]).head ! Endpoint.Attach(hook, provide)
  }

  def receive = handleHttpRequest
}

object Service
{
  val server = "http://10.10.1.1:9998"     // <--- Your server addr here
}

class PageActor extends Actor
{
  def receive =
  {
    case get:Get => {

      get.request.getRequestURI match {

        case page if page == "/index.html" => {

          // steps from the leeloo wiki - https://bitbucket.org/smartproject/oauth-2.0/wiki/Client

          val oauthreq = OAuthClientRequest
              .authorizationLocation("https://graph.facebook.com/oauth/authorize")
              .setClientId("0101")    // <--- Your application ID here
              .setRedirectURI(Service.server+"/auth.html")
              .buildQueryMessage

          get.response.sendRedirect(oauthreq.getLocationUri)
        }

        case page if page startsWith "/auth.html" => {

          val code = OAuthAuthzResponse.oauthCodeAuthzResponse(get.request).getCode
          log.slf4j.info("Got auth code: {}", code)

          val oauthreq = OAuthClientRequest
                .tokenLocation("https://graph.facebook.com/oauth/access_token")
                .setGrantType(GrantType.AUTHORIZATION_CODE)
                .setClientId("0101")                          // <-- Your application ID here
                .setClientSecret("deadbeef")                  // <-- Your applciation secret here
                .setRedirectURI(Service.server+"/auth.html")  // <-- Must be the same URI as previous
                .setCode(code)
                .buildBodyMessage

          //create OAuth client that uses custom http client under the hood
          val client = new OAuthClient(new URLConnectionClient)

          //Facebook is not fully compatible with OAuth 2.0 draft 10, access token response is
          //application/x-www-form-urlencoded, not json encoded so we use dedicated response class for that
          //Custom response classes are an easy way to deal with oauth providers that introduce modifications to
          //OAuth 2.0 specification
          val oatuhresp = client.accessToken(oauthreq, classOf[GitHubTokenResponse]);

          val token = oatuhresp getAccessToken
          val expiry = oatuhresp getExpiresIn

          log.slf4j.info("Got token {} expiry {}", token, expiry)

          get OK "ok"
        }
      }
    }
  }
}