Play 2.3.x Scala + i18n

[Ignacio Nieto]

Hi all

How does the engine works?

Suppose I have 

    Accept-Language: en-US,es-AR;q=0.5

I have my application.conf configured as:

    application.langs="en,es,pt"

And my template:

    @(...)(implicit lang: play.api.i18n.Lang, request: play.api.mvc.Request[AnyContent])

I would like the framework to cascade languages. i.e:

· en-US, en-GB and en-** --> default to --> en (messages.en)

 ·es-AR, es-CL and es-** --> default to --> es (messages.es)

How can I achieve this behavior?

Another thing I noticed is that i18n doesn't default to "messages" (w/ no extension) file, they default to the first language defined in "application.langs"

Thanks,

Ignacio

[Ignacio Nieto]

We finally resolved it by doing this Filter:

package controllers.Filters

import play.api.Play

import play.api.Play.current

import play.api.http.HeaderNames

import play.api.i18n.Lang

import play.api.mvc._

import scala.concurrent.Future

object LangFilter extends Filter {

  def apply (nextFilter: (RequestHeader) => Future[Result]) (request: RequestHeader): Future[Result] = {

    val applicationLangs = Lang.availables

    val requestlangs: Seq[Lang] = request.acceptLanguages

    val countryLessLangs: Seq[Lang] = requestlangs.map(l => Lang(l.language))   //we use them as defaults for latam countries (es,pt,en)

    val maybeLangFromCookie: Option[Lang] = request.cookies.get(Play.langCookieName).flatMap(c => Lang.get(c.value))

   
    //First, read from cookie

    val l: Lang = maybeLangFromCookie.getOrElse {
      //Second, look for the lang in request headers

      requestlangs.collectFirst(Function.unlift { 

        lang => applicationLangs.find(_.satisfies(lang))

      }).getOrElse {
        //Third, we remove the COUNTRY from the headers, "pt-BR" -> "pt" and look for the lang

        countryLessLangs.collectFirst(Function.unlift {  

          lang => applicationLangs.find(_.satisfies(lang))

        }).getOrElse(applicationLangs.headOption.getOrElse(Lang.defaultLang))

           //Finally, we use the first on the application.conf list.

      }

    }

    //After finding the language, we set it as the "Accept-Language" Header while clonning the request.

    val newHeaders = new Headers { val data = (request.headers.toMap + (HeaderNames.ACCEPT_LANGUAGE -> Seq(l.code))).toList }

    nextFilter(request.copy(headers = newHeaders))

  }

}