Multipart form data with Play Framework 2 WS client

multipart form data in Play WS

//The following example allows you to post `multipart/form-data`. It is a simple version that only 
//works with `String` values, but it could easily be modified to use other types of data.

    type NameValuePair = (String, String)
    case class MultipartFormData(elements: Seq[NameValuePair], boundary: String)(
      implicit codec: Codec) {

      private val HTTP_SEPARATOR = "\r\n"
      private val actualBoundary = "--" + boundary
      private val endBoundary = actualBoundary + "--" + HTTP_SEPARATOR

      private val contentType = "multipart/form-data; boundary=" + boundary
      private val content = elements.map(toPart).mkString + endBoundary

      val body = Body(content)

      case class Body(content: String)

      object Body {
        implicit val contentTypeOf:ContentTypeOf[Body] =
          ContentTypeOf(Some(contentType))
        implicit val writes: Writeable[Body] =
          Writeable(body => codec.encode(body.content))
      }

      private def toPart(nameValuePair: NameValuePair) = {
        val (name, value) = nameValuePair
        actualBoundary + HTTP_SEPARATOR +
          "Content-Disposition: form-data; name=\"" + name + "\"" + HTTP_SEPARATOR +
          HTTP_SEPARATOR +
          value + HTTP_SEPARATOR
      }
    }

//Usage is like this:

    val data = MultipartFormData(formFields, "asdfghjkl123")

    WS.url(myUrl).post(data.body)