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package cask.model
import java.io.{InputStream, OutputStream, OutputStreamWriter}
import cask.internal.Util
/**
* The basic response returned by a HTTP endpoint.
*
* Note that [[data]] by default can take in a wide range of types: strings,
* bytes, uPickle JSON-convertable types or arbitrary input streams. You can
* also construct your own implementations of `Response.Data`.
*/
case class Response[+T](
data: T,
statusCode: Int,
headers: Seq[(String, String)],
cookies: Seq[Cookie]
){
def map[V](f: T => V) = new Response(f(data), statusCode, headers, cookies)
}
object Response {
type Raw = Response[Data]
def apply[T](data: T,
statusCode: Int = 200,
headers: Seq[(String, String)] = Nil,
cookies: Seq[Cookie] = Nil) = new Response(data, statusCode, headers, cookies)
trait Data{
def write(out: OutputStream): Unit
}
trait DataCompanion[V]{
// Put the implicit constructors for Response[Data] into the `Data` companion
// object and all subclasses of `Data`, because for some reason putting them in
// the `Response` companion object doesn't work properly. For the same unknown
// reasons, we cannot have `dataResponse` and `dataResponse2` take two type
// params T and V, and instead have to embed the implicit target type as a
// parameter of the enclosing trait
implicit def dataResponse[T](t: T)(implicit c: T => V): Response[V] = {
Response(c(t))
}
implicit def dataResponse2[T](t: Response[T])(implicit c: T => V): Response[V] = {
t.map(c(_))
}
}
object Data extends DataCompanion[Data]{
implicit class UnitData(s: Unit) extends Data{
def write(out: OutputStream) = ()
}
implicit class StringData(s: String) extends Data{
def write(out: OutputStream) = out.write(s.getBytes)
}
implicit class NumericData[T: Numeric](s: T) extends Data{
def write(out: OutputStream) = out.write(s.toString.getBytes)
}
implicit class BooleanData(s: Boolean) extends Data{
def write(out: OutputStream) = out.write(s.toString.getBytes)
}
implicit class BytesData(b: Array[Byte]) extends Data{
def write(out: OutputStream) = out.write(b)
}
implicit class StreamData(b: InputStream) extends Data{
def write(out: OutputStream) = Util.transferTo(b, out)
}
}
}
object Redirect{
def apply(url: String) = Response("", 301, Seq("Location" -> url), Nil)
}
object Abort{
def apply(code: Int) = Response("", code, Nil, Nil)
}
object StaticFile{
def apply(path: String, headers: Seq[(String, String)]) = {
val relPath = java.nio.file.Paths.get(path)
val (data0, statusCode0) =
if (java.nio.file.Files.exists(relPath) && java.nio.file.Files.isRegularFile(relPath)){
(java.nio.file.Files.newInputStream(relPath): Response.Data, 200)
}else{
("": Response.Data, 404)
}
Response(data0, statusCode0, headers, Nil)
}
}
object StaticResource{
def apply(path: String, resourceRoot: ClassLoader, headers: Seq[(String, String)]) = {
val (data0, statusCode0) = resourceRoot.getResourceAsStream(path) match{
case null => ("": Response.Data, 404)
case res => (res: Response.Data, 200)
}
Response(data0, statusCode0, headers, Nil)
}
}
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