Lift Images.scala

/*
Here's some code to serve an image out of the database.  Here's the Mapper
definition:
*/

class Image extends LongKeyedMapper[Image] with IdPK {
  def getSingleton = Image

  object image extends MappedBinary(this)
  object lookup extends MappedUniqueId(this, 32) {
    override def dbIndexed_? = true
  }
  object saveTime extends MappedLong(this) {
    override def defaultValue = millis
  }
  object mimeType extends MappedString(this, 256)
}

object Image extends Image with LongKeyedMetaMapper[Image]

//And here's the code that serves the image:

object ImageLogic {
  object TestImage {
    def unapply(in: String): Option[Image] =
    Image.find(By(Image.lookup, in.trim))
  }

  def matcher: LiftRules.DispatchPF = {
    case r @ Req("image_logic" :: TestImage(img) ::
                 Nil, _, GetRequest) => () => servImage(img, r)
  }

  def servImage(img: Image, r: Req): Box[LiftResponse] = {
    if (r.testIfModifiedSince(img.saveTime))
    Full(InMemoryResponse(new Array[Byte](0),
                          List("Last-Modified" ->
                               toInternetDate(img.saveTime.is)), Nil, 304))
    else Full(InMemoryResponse(img.image.is,
                               List("Last-Modified" ->
                                    toInternetDate(img.saveTime.is),
                                    "Content-Type" -> img.mimeType.is,
                                    "Content-Length" ->
                                    img.image.is.length.toString), Nil, 200))
  }
}

//In Boot:

     LiftRules.dispatch.append(ImageLogic.matcher)