org.http4k.security.digest.DigestChallenge.kt Maven / Gradle / Ivy

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Http4k Security Digest support

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package org.http4k.security.digest

import org.http4k.appendIf
import org.http4k.appendIfPresent
import org.http4k.security.Nonce

/**
 * The Digest Authorization challenge to be returned to the user as a header
 */
data class DigestChallenge(
    val realm: String,
    val nonce: Nonce,
    val algorithm: String?,
    val qop: List,
    val opaque: String?
) {
    fun toHeaderValue(): String {
        val qopValue = qop.joinToString(", ") { it.value }

        return StringBuilder("Digest realm=\"$realm\", nonce=\"$nonce\"")
            .appendIfPresent(algorithm, ", algorithm=$algorithm")
            .appendIf({ qop.isNotEmpty() }, ", qop=\"$qopValue\"")
            .appendIfPresent(opaque, ", opaque=\"$opaque\"")
            .toString()
    }

    companion object {
        fun parse(headerValue: String): DigestChallenge? {
            val (prefix, parameters) = ParameterizedHeader.parse(headerValue)

            return when {
                prefix.startsWith("Digest") -> DigestChallenge(
                    realm = parameters["realm"]!!,
                    nonce = Nonce(parameters["nonce"]!!),
                    algorithm = parameters["algorithm"],
                    qop = (parameters["qop"] ?: "")
                        .split(",")
                        .mapNotNull { Qop.from(it.trim()) },
                    opaque = parameters["opaque"]
                )
                else -> null
            }
        }
    }
}