okhttp

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/*
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 * Copyright (C) 2021 Square, Inc.
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *    https://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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// https://www.eclipse.org/jetty/documentation/current/alpn-chapter.html#alpn-versions
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private fun alpnBootVersionForPatchVersion(patchVersion: Int): String? {
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  return when (patchVersion) {
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    in 0..24 -> "8.1.0.v20141016"
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    in 25..30 -> "8.1.2.v20141202"
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    in 31..50 -> "8.1.3.v20150130"
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    in 51..59 -> "8.1.4.v20150727"
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    in 60..64 -> "8.1.5.v20150921"
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    in 65..70 -> "8.1.6.v20151105"
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    in 71..77 -> "8.1.7.v20160121"
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    in 78..101 -> "8.1.8.v20160420"
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    in 102..111 -> "8.1.9.v20160720"
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    in 112..120 -> "8.1.10.v20161026"
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    in 121..160 -> "8.1.11.v20170118"
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    in 161..181 -> "8.1.12.v20180117"
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    in 191..242 -> "8.1.13.v20181017"
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    else -> null
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  }
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}
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/**
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 * Returns the alpn-boot version specific to this OpenJDK 8 JVM, or null if this is not a Java 8 VM.
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 * https://github.com/xjdr/xio/blob/master/alpn-boot.gradle
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 */
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fun alpnBootVersion(): String? {
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  val version = System.getProperty("alpn.boot.version")
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  if (version != null) {
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    return version
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  }
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  val javaVersion = System.getProperty("java.version")
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  val match = "1\\.8\\.0_(\\d+)(-.*)?".toRegex().find(javaVersion) ?: return null
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  return alpnBootVersionForPatchVersion(match.groupValues.first().toInt())
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}
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