Scala – Setting HTTP headers in Play 2.0 (scala)

playframeworkplayframework-2.0scala

I'm experimenting with the Play 2.0 framework on Scala. I'm trying to figure out how to send down custom HTTP headers–in this case, "Content-Disposition:attachment; filename=foo.bar". I can't seem to find documentation on how to do so (documentation on Play 2.0 is overall pretty sparse at this point).

Any hints?

Best Answer

The result types are in play.api.mvc.Results, see here on GitHub.

In order to add headers, you'd write:

Ok
  .withHeaders(CONTENT_TYPE -> "application/octet-stream")
  .withHeaders(CONTENT_DISPOSITION -> "attachment; filename=foo.txt")

Ok.withHeaders(
  CONTENT_TYPE -> "application/octet-stream",
  CONTENT_DISPOSITION -> "attachment; filename=foo.txt"
)

And here is a full sample download:

def download = Action {
  import org.apache.commons.io.IOUtils
  val input = Play.current.resourceAsStream("public/downloads/Image.png")
  input.map { is =>
    Ok(IOUtils.toByteArray(is))
      .withHeaders(CONTENT_DISPOSITION -> "attachment; filename=foo.png")
  }.getOrElse(NotFound("File not found!"))
}

To download a file, Play now offers another simple way:

def download = Action {
  Ok.sendFile(new java.io.File("public/downloads/Image1.png"), fileName = (name) => "foo.png")
}

The disadvantage is that this results in an exception if the file is not found. Also, the filename is specified via a function, which seems a bit overkill.

Related Solutions

Scala – Play Scala Application “not found: value action”

I have just started myself with play and scala I found that play 2.0 isn't something one should start with.

There seems to be much lacking in play 2.0 and much of the tutorials is for play 1.x. For example I lost some time with play eclipify just to find in a bug archive that such "comfort" isn't implemented in play 2.0. So I would recommend to learn scala with play 1.

And in your step in the tutorial (tutorial for play 1 I dont know for play 2) you should change:

controllers.Application.index  to  controllers.Application.sayHello

add to contollers.scala

def sayHello = html.sayHello(params.get("myName"))

Add this file helloworld/app/views/Application/sayHello.scala.html:

@(name:String)

  @main(title = "Hello") {

  <h1>Hello @(name ?: "Guest")!</h1>

  <a href="@action(controllers.Application.index)">Back to form</a>

}

Scala – How to get payload from a POST in Play 2.0

You should be able to do the following:

def index = Action { request =>
  val body = request.body
}

And also things like:

def index = Action { request =>
  val name = request.queryString.get("name").flatMap(_.headOption)
  Ok("Hello " + name.getOrElse("Guest"))
}

Best Answer

Related Solutions

Scala – Play Scala Application “not found: value action”

Scala – How to get payload from a POST in Play 2.0

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