From df0bbe8126f771c860d057a34d6b3f26c69d92bf Mon Sep 17 00:00:00 2001
From: Leonid Stashevsky <leonid.stashevsky@gmail.com>
Date: Fri, 20 Mar 2020 12:09:14 +0300
Subject: [PATCH] Use window.location.origin as default host in URLBuilder

	Closes #1695
---
 ktor-http/common/src/io/ktor/http/URLBuilder.kt  |  9 ++++++++-
 ktor-http/js/src/io/ktor/http/URLBuilderJs.kt    | 16 ++++++++++++++++
 ktor-http/jvm/src/io/ktor/http/URLBuilderJvm.kt  |  8 ++++++++
 .../posix/src/io/ktor/http/URLBuilderPosix.kt    | 14 ++++++++++++++
 4 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 ktor-http/js/src/io/ktor/http/URLBuilderJs.kt
 create mode 100644 ktor-http/posix/src/io/ktor/http/URLBuilderPosix.kt

diff --git a/ktor-http/common/src/io/ktor/http/URLBuilder.kt b/ktor-http/common/src/io/ktor/http/URLBuilder.kt
index 9c09c2d692d..ef7f8fb36bb 100644
--- a/ktor-http/common/src/io/ktor/http/URLBuilder.kt
+++ b/ktor-http/common/src/io/ktor/http/URLBuilder.kt
@@ -24,7 +24,7 @@ const val DEFAULT_PORT: Int = 0
  */
 class URLBuilder(
     var protocol: URLProtocol = URLProtocol.HTTP,
-    var host: String = "localhost",
+    var host: String = originHost,
     var port: Int = DEFAULT_PORT,
     var user: String? = null,
     var password: String? = null,
@@ -84,6 +84,13 @@ class URLBuilder(
     companion object
 }
 
+/**
+ * Hostname of current origin.
+ *
+ * It uses "localhost" for all platforms except js.
+ */
+expect val URLBuilder.Companion.originHost: String
+
 /**
  * Create a copy of this builder. Modifications in a copy is not reflected in the original instance and vise-versa.
  */
diff --git a/ktor-http/js/src/io/ktor/http/URLBuilderJs.kt b/ktor-http/js/src/io/ktor/http/URLBuilderJs.kt
new file mode 100644
index 00000000000..497f8c6c296
--- /dev/null
+++ b/ktor-http/js/src/io/ktor/http/URLBuilderJs.kt
@@ -0,0 +1,16 @@
+/*
+ * Copyright 2014-2020 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package io.ktor.http
+
+import io.ktor.util.*
+import kotlin.browser.*
+
+/**
+ * Hostname of current origin.
+ *
+ * It uses "localhost" for all platforms except js.
+ */
+actual val URLBuilder.Companion.originHost: String
+    get() = if (PlatformUtils.IS_BROWSER) window.location.origin else "localhost"
diff --git a/ktor-http/jvm/src/io/ktor/http/URLBuilderJvm.kt b/ktor-http/jvm/src/io/ktor/http/URLBuilderJvm.kt
index cc91099dee8..e0d5bf420da 100644
--- a/ktor-http/jvm/src/io/ktor/http/URLBuilderJvm.kt
+++ b/ktor-http/jvm/src/io/ktor/http/URLBuilderJvm.kt
@@ -12,3 +12,11 @@ import java.net.*
 operator fun Url.Companion.invoke(fullUrl: String): Url = URLBuilder().apply {
     takeFrom(URI(fullUrl))
 }.build()
+
+/**
+ * Hostname of current origin.
+ *
+ * It uses "localhost" for all platforms except js.
+ */
+actual val URLBuilder.Companion.originHost: String
+    get() = "localhost"
diff --git a/ktor-http/posix/src/io/ktor/http/URLBuilderPosix.kt b/ktor-http/posix/src/io/ktor/http/URLBuilderPosix.kt
new file mode 100644
index 00000000000..49025fbc273
--- /dev/null
+++ b/ktor-http/posix/src/io/ktor/http/URLBuilderPosix.kt
@@ -0,0 +1,14 @@
+/*
+ * Copyright 2014-2020 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package io.ktor.http
+
+
+/**
+ * Hostname of current origin.
+ *
+ * It uses "localhost" for all platforms except js.
+ */
+actual val URLBuilder.Companion.originHost: String
+    get() = "localhost"