play framework2: remove trailing slash from urls

Question

In play framework 1, you could use in the routes file something like this (check documentation at http://www.playframework.org/documentation/1.2.5/routes#syntax)

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Answer 1

Updated the example by @opensas and @lloydmeta for play 2.5

/**
  * HttpRequestHandler that removes trailing slashes from requests.
  */
class TrailingSlashNormaliserHttpRequestHandler(router: Router, errorHandler: HttpErrorHandler, configuration: HttpConfiguration, filters: HttpFilters) extends HttpRequestHandler {

  private val default = new DefaultHttpRequestHandler(router, errorHandler, configuration, filters)

  override def handlerForRequest(request: RequestHeader): (RequestHeader, Handler) = {
    default.handlerForRequest(removeTrailingSlash(request))
  }

  private def removeTrailingSlash(origReq: RequestHeader): RequestHeader = {
    if (origReq.path.endsWith("/") && origReq.path != "/") {
      val path = origReq.path.stripSuffix("/")
      if (origReq.rawQueryString.isEmpty) {
        origReq.copy(path = path, uri = path)
      }else {
        origReq.copy(path = path, uri = path + s"?${origReq.rawQueryString}")
      }
    } else {
      origReq
    }
  }
}

see https://www.playframework.com/documentation/2.5.x/ScalaHttpRequestHandlers for instructions on how to apply the handler