From fe8187ba6d03ed90fd97d365ecb8dab97c2e4fff Mon Sep 17 00:00:00 2001
From: Bruno Coelho <4brunu@users.noreply.github.com>
Date: Sat, 4 Jun 2022 09:26:59 +0100
Subject: [PATCH] [Kotlin][Client] replace java.nio.* to avoid crash on Android
 API 25 and bellow (#12529)

* [Kotlin][Client] replace java.nio.* to avoid crash on Android API 25 and bellow

* [Kotlin][Client] update sample projects

* [Kotlin][Client] update sample projects
---
 .../infrastructure/ApiClient.kt.mustache         | 16 ++++++++++------
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 .../client/infrastructure/ApiClient.kt           | 14 +++++++++-----
 20 files changed, 181 insertions(+), 101 deletions(-)

diff --git a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/infrastructure/ApiClient.kt.mustache b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/infrastructure/ApiClient.kt.mustache
index 50adff43789..32b20282811 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/infrastructure/ApiClient.kt.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/infrastructure/ApiClient.kt.mustache
@@ -206,22 +206,26 @@ import com.squareup.moshi.adapter
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             {{^supportAndroidApiLevel25AndBelow}}
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.{{packageName}}", null).toFile()
+            val tempFile = java.nio.file.Files.createTempFile("tmp.{{packageName}}", null).toFile()
             {{/supportAndroidApiLevel25AndBelow}}
             {{#supportAndroidApiLevel25AndBelow}}
-            val f = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            val tempFile = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                 java.nio.file.Files.createTempFile("tmp.net.medicineone.teleconsultationandroid.openapi.openapicommon", null).toFile()
             } else {
                 @Suppress("DEPRECATION")
                 createTempFile("tmp.net.medicineone.teleconsultationandroid.openapi.openapicommon", null)
             }
             {{/supportAndroidApiLevel25AndBelow}}
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-array-simple-string-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-array-simple-string-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 5b21ddef1c8..6db8e7c74f2 100644
--- a/samples/client/petstore/kotlin-array-simple-string-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-array-simple-string-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -116,12 +116,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-array-simple-string-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-array-simple-string-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 3dd90f5f36d..bfd00ac6a2e 100644
--- a/samples/client/petstore/kotlin-array-simple-string-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-array-simple-string-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -118,12 +118,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-bigdecimal-default-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-bigdecimal-default-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 3dd90f5f36d..bfd00ac6a2e 100644
--- a/samples/client/petstore/kotlin-bigdecimal-default-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-bigdecimal-default-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -118,12 +118,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 5b21ddef1c8..6db8e7c74f2 100644
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -116,12 +116,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 3dd90f5f36d..bfd00ac6a2e 100644
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -118,12 +118,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-enum-default-value/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-enum-default-value/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 3dd90f5f36d..bfd00ac6a2e 100644
--- a/samples/client/petstore/kotlin-enum-default-value/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-enum-default-value/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -118,12 +118,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 78a723ea49b..17485b2c887 100644
--- a/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -117,12 +117,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index e4f45f28927..5040c47697c 100644
--- a/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -117,12 +117,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index e00657437a9..804c66706c2 100644
--- a/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,16 +119,20 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
-            val f = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            // return tempFile
+            val tempFile = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                 java.nio.file.Files.createTempFile("tmp.net.medicineone.teleconsultationandroid.openapi.openapicommon", null).toFile()
             } else {
                 @Suppress("DEPRECATION")
                 createTempFile("tmp.net.medicineone.teleconsultationandroid.openapi.openapicommon", null)
             }
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index ab05dc14f20..cacd2b743b3 100644
--- a/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -120,12 +120,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-modelMutable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-modelMutable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index c48bc6a8193..4ad22a02df0 100644
--- a/samples/client/petstore/kotlin-modelMutable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-modelMutable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -118,12 +118,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index c48bc6a8193..4ad22a02df0 100644
--- a/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -118,12 +118,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 1c2e0a93e8a..61ba8e30416 100644
--- a/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -118,12 +118,16 @@ internal open class ApiClient(val baseUrl: String, val client: OkHttpClient = de
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index c48bc6a8193..4ad22a02df0 100644
--- a/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -118,12 +118,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index ef5d9840725..9fcf1385050 100644
--- a/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -116,12 +116,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index c48bc6a8193..4ad22a02df0 100644
--- a/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -118,12 +118,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index d4ea2444ab5..3d6b7ccb792 100644
--- a/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -118,12 +118,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin-uppercase-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-uppercase-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 3dd90f5f36d..bfd00ac6a2e 100644
--- a/samples/client/petstore/kotlin-uppercase-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-uppercase-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -118,12 +118,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {
diff --git a/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index c48bc6a8193..4ad22a02df0 100644
--- a/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -118,12 +118,16 @@ open class ApiClient(val baseUrl: String, val client: OkHttpClient = defaultClie
             return null
         }
         if (T::class.java == File::class.java) {
-            // return tempfile
+            // return tempFile
             // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
-            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
-            f.deleteOnExit()
-            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
-            return f as T
+            val tempFile = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            tempFile.deleteOnExit()
+            body.byteStream().use { inputStream ->
+                tempFile.outputStream().use { tempFileOutputStream ->
+                    inputStream.copyTo(tempFileOutputStream)
+                }
+            }
+            return tempFile as T
         }
         val bodyContent = body.string()
         if (bodyContent.isEmpty()) {