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

This is based on opensas's answer, just simplified a bit to reuse Play's built-in copy method on RequestHeader so that all the things in the original RequestHeader are kept, like id, tags, version, secure, etc.

import play.api.GlobalSettings
import play.api.mvc.{Handler, RequestHeader}

trait TrailingSlashNormaliser extends GlobalSettings {

  def removeTrailingSlash(origReq: RequestHeader): RequestHeader = {
    if (origReq.path.endsWith("/")) {
      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
    }
  }

  override def onRouteRequest(request: RequestHeader): Option[Handler] = 
    super.onRouteRequest(removeTrailingSlash(request))

}

/**
 * Global object that removes trailing slashes from requests.
 */
object Global extends TrailingSlashNormaliser