26 lines
784 B
Scala
26 lines
784 B
Scala
package controllers.caching
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import play.api.mvc.Results.NotModified
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import play.api.mvc.{Request, Result}
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import scala.concurrent.{ExecutionContext, Future}
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trait Etagable[A]:
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extension (a: A) def etag: String
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extension [A, R[X] <: Request[X], E: Etagable](request: R[A]) {
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def checkFreshAsync(entity: E)(onStale: => Future[Result])(using ec: ExecutionContext): Future[Result] = {
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compareEtag(entity).fold(onStale)(
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etag => Future.successful(NotModified.withHeaders("ETag" -> etag))
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)
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}
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def checkFresh(entity: E)(onStale: => Result): Result = {
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compareEtag(entity).fold(onStale)(
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etag => NotModified.withHeaders("ETag" -> etag)
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)
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}
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private def compareEtag(entity: E) = request.headers.get("If-None-Match").filter(e => e == entity.etag)
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} |