Hi,
I didn't find a counterpart of mapRequestContext in akka-http, so I just
allow all the methods I have in my route. Here is my shot at CORS in
akka-http:
import akka.http.scaladsl.model.HttpMethods._
import akka.http.scaladsl.model.HttpResponse
import akka.http.scaladsl.model.headers._
import akka.http.scaladsl.server.Directives._
import akka.http.scaladsl.server.{AuthenticationFailedRejection, Directive0,
RejectionHandler, Route}
import com.typesafe.config.ConfigFactory
trait CorsSupport {
lazy val allowedOrigin = {
val config = ConfigFactory.load()
val sAllowedOrigin = config.getString("cors.allowed-origin")
HttpOrigin(sAllowedOrigin)
}
//this directive adds access control headers to normal responses
private def addAccessControlHeaders: Directive0 = {
mapResponseHeaders { headers =>
`Access-Control-Allow-Origin`(allowedOrigin) +:
`Access-Control-Allow-Credentials`(true) +:
`Access-Control-Allow-Headers`("Authorization", "Content-Type",
"X-Requested-With") +:
headers
}
}
//this handles preflight OPTIONS requests. TODO: see if can be done with
rejection handler,
//otherwise has to be under addAccessControlHeaders
private def preflightRequestHandler: Route = options {
complete(HttpResponse(200).withHeaders(
`Access-Control-Allow-Methods`(OPTIONS, POST, PUT, GET, DELETE)
)
)
}
def corsHandler(r: Route) = addAccessControlHeaders {
preflightRequestHandler ~ r
}
}
you may notice I take allowed origin from the config file option
"cors.allowed-origin". I mix this trait into my class which contains a
route I want to handle CORS and wrap the route into corsHandler like so:
corsHandler {
path("") { ... }
}
On Tuesday, March 10, 2015 at 4:14:53 PM UTC+2, Ganta Murali Krishna wrote:
>
> Hello,
>
> I am currently experimenting with Akka-http on one of our modules. *Below
> (or attached) is my current CORS file for spray*. I am struggling with
> conversion, for e.g.: I cant find alternative to mapRequestContext. Can
> any help me to rewrite/convert this please. So I can use this with
> akka-http. Any help is appreciated.
>
> Regards
> Murali
>
> import spray.http.{HttpMethods, HttpMethod, HttpResponse, AllOrigins}
> import spray.http.HttpHeaders._
> import spray.http.HttpMethods._
> import spray.routing._
>
> trait CORSSupport {
> this: HttpService =>
> private val allowOriginHeader = `Access-Control-Allow-Origin`(AllOrigins)
> private val optionsCorsHeaders = List(
> `Access-Control-Allow-Headers`("Origin,
> X-Requested-With,Authorization,Content-Type, Accept, Accept-Encoding,
> Accept-Language, Host, Referer, User-Agent,apiKey"),
> `Access-Control-Max-Age`(1728000))
>
> def cors[T]: Directive0 = mapRequestContext { ctx =>
> ctx.withRouteResponseHandling({
> //It is an option requeset for a resource that responds to some other
> method
> case Rejected(x) if (ctx.request.method.equals(HttpMethods.OPTIONS) &&
> !x.filter(_.isInstanceOf[MethodRejection]).isEmpty) => {
> val allowedMethods: List[HttpMethod] =
> x.filter(_.isInstanceOf[MethodRejection]).map(rejection => {
> rejection.asInstanceOf[MethodRejection].supported
> })
> ctx.complete(HttpResponse().withHeaders(
> `Access-Control-Allow-Methods`(OPTIONS, allowedMethods: _*) ::
> allowOriginHeader ::
> optionsCorsHeaders
> ))
> }
> }).withHttpResponseHeadersMapped { headers =>
> allowOriginHeader :: headers
> }
> }
> }
>
>
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