Fix some warnings

Author: dbalduini

scala-oauth2-core/src/main/scala/scalaoauth2/provider/DataHandler.scala

@@ -173,10 +173,10 @@ trait DataHandler[U] {
    * @return true if accessToken expired
    */
   def isAccessTokenExpired(accessToken: AccessToken): Boolean = {
-    accessToken.expiresIn.map { expiresIn =>
+    accessToken.expiresIn.exists { expiresIn =>
       val now = System.currentTimeMillis()
       accessToken.createdAt.getTime + expiresIn * 1000 <= now
-    }.getOrElse(false)
+    }
   }
 
 }

scala-oauth2-core/src/main/scala/scalaoauth2/provider/ResourceServer.scala

@@ -0,0 +1,8 @@
+package scalaoauth2.provider
+
+/**
+ * @author dbalduini
+ */
+class ResourceServer {
+
+}

scala-oauth2-core/src/main/scala/scalaoauth2/provider/TokenEndpoint.scala

@@ -15,7 +15,7 @@ trait TokenEndpoint {
 
   def handleRequest[U](request: AuthorizationRequest, dataHandler: DataHandler[U]): Future[Either[OAuthError, GrantHandlerResult]] = try {
     val grantType = request.grantType.getOrElse(throw new InvalidRequest("grant_type is not found"))
-    val handler = handlers.get(grantType).getOrElse(throw new UnsupportedGrantType("The grant_type is not supported"))
+    val handler = handlers.getOrElse(grantType, throw new UnsupportedGrantType("The grant_type is not supported"))
 
     fetcher.fetch(request).map { clientCredential =>
       dataHandler.validateClient(clientCredential, grantType).flatMap { validClient =>