How can I add a user using a 3rd party token sent from my mobile app with Silhouette?

[Elvis Lee]

Hi guys,

I am trying to implement facebook login feature on my mobile app.

Here is what I am going to do.

1. Fetch a user's authInfo(access token, expired time, etc...) on mobile app. 

2. Send the authInfo to server.

3. server use the authInfo to retrieve user's profile from facebook, then add a new user to databse, finally return a JWT token.

I am going parse OAuth2Info for facebook in this case, so I put type parameter p.A in validate function.

I thought the p.A would be FacebookProvider.OAuth2Info In runtime and it does have json Reads, however, I got a compilation error: No Json deserializer found for type p.A. Try to implement an implicit Reads or Format for this type.

How can I parse dynamic type in this case?

Thanks

Elvis

  def signInWith3rdParty(provider: String) = Action.async(parse.json) { implicit request =>

    (socialProviderRegistry.get[SocialProvider](provider) match {

      case Some(p: SocialProvider with CommonSocialProfileBuilder) =>

        request.body.validate[p.A].map { authInfo =>          // Error: No Json deserializer found for type p.A. Try to implement an implicit Reads or Format for this type.

          for {

            profile <- p.retrieveProfile(authInfo)

            user <- userService.save(profile)

            authInfo <- authInfoRepository.save(profile.loginInfo, authInfo)

            authenticator <- env.authenticatorService.create(profile.loginInfo)

            token <- env.authenticatorService.init(authenticator)

          } yield Ok(Json.obj(

            "result" -> true,

            "token" -> token,

            "user" -> user))

        }.recoverTotal {

          case error =>

            Future.successful(Unauthorized(JsonValidationHandler.toJsValue(error)))

        }

      case _ => Future.failed(new ProviderException(s"Cannot authenticate with unexpected social provider $provider"))

    }).recover {

      case e: ProviderException =>

        logger.error("Unexpected provider error", e)

        Redirect(routes.ApplicationController.index())

    }

  }