Do IDNA mapping on Kotlin/JS (#7800)

okhttp-testing-support/build.gradle.kts

@@ -7,8 +7,23 @@ kotlin {
   jvm {
     withJava()
   }
+  if (kmpJsEnabled) {
+    js(IR) {
+      nodejs()
+    }
+  }
 
   sourceSets {
+    val commonMain by getting {
+      dependencies {
+        api(libs.squareup.okio)
+      }
+    }
+    val jsMain by getting {
+      dependencies {
+        implementation(libs.squareup.okio.nodefilesystem)
+      }
+    }
     val jvmMain by getting {
       dependencies {
         api(projects.okhttp)

okhttp-testing-support/src/commonMain/kotlin/okhttp3/TestUtilCommon.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2023 Square, Inc.
+ *
+ * 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 okhttp3
+
+import okio.FileSystem
+import okio.Path
+import okio.Path.Companion.toPath
+
+val okHttpRoot: Path
+  get() = getEnv("OKHTTP_ROOT")!!.toPath()
+
+expect val SYSTEM_FILE_SYSTEM: FileSystem
+
+expect fun getEnv(name: String): String?
+
+expect val isJvm: Boolean

okhttp-testing-support/src/jsMain/kotlin/okhttp3/TestUtilJs.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2023 Square, Inc.
+ *
+ * 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 okhttp3
+
+import okio.FileSystem
+import okio.NodeJsFileSystem
+
+actual fun getEnv(name: String) = js("globalThis.process.env[name]") as String?
+
+actual val SYSTEM_FILE_SYSTEM: FileSystem = NodeJsFileSystem
+
+actual val isJvm = false

okhttp-testing-support/src/jvmMain/kotlin/okhttp3/TestUtilJvm.kt

@@ -22,6 +22,7 @@ import java.net.UnknownHostException
 import java.util.Arrays
 import okhttp3.internal.http2.Header
 import okio.Buffer
+import okio.FileSystem
 import org.junit.jupiter.api.Assumptions.assumeFalse
 import org.junit.jupiter.api.Assumptions.assumeTrue
 
@@ -122,3 +123,9 @@ object TestUtil {
     block(suppressed.toList())
   }
 }
+
+actual fun getEnv(name: String) = System.getenv(name)
+
+actual val SYSTEM_FILE_SYSTEM = FileSystem.SYSTEM
+
+actual val isJvm = true