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DNT.scala
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DNT.scala
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/*
* Copyright 2013 http4s.org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.http4s
package headers
import cats.parse.Parser
import cats.parse.Parser.char
import cats.parse.Parser.string
import org.typelevel.ci._
sealed abstract class DNT(val value: String) extends Product with Serializable
object DNT {
case object AllowTracking extends DNT("0")
case object DisallowTracking extends DNT("1")
case object NoPreference extends DNT("null")
/*
* `DNT = 0 | 1 | null`
*/
private[http4s] val parser: Parser[DNT] = {
val nullParser = string("null").as(NoPreference)
val allowTrackingParser = char('0').as(AllowTracking)
val disallowTrackingParser = char('1').as(DisallowTracking)
allowTrackingParser | disallowTrackingParser | nullParser
}
def parse(s: String): ParseResult[DNT] =
ParseResult.fromParser(parser, "Invalid DNT header")(s)
implicit val headerInstance: Header[DNT, Header.Single] =
Header.create(
ci"DNT",
_.value,
parse,
)
}