Declare Kotlin API classes as open (#11129)

modules/openapi-generator/src/main/resources/kotlin-client/libraries/multiplatform/api.mustache

@@ -16,7 +16,7 @@ import kotlinx.serialization.descriptors.*
 import kotlinx.serialization.encoding.*
 
 {{#operations}}
-{{#nonPublicApi}}internal {{/nonPublicApi}}class {{classname}}(
+{{#nonPublicApi}}internal {{/nonPublicApi}}open class {{classname}}(
     baseUrl: String = ApiClient.BASE_URL,
     httpClientEngine: HttpClientEngine? = null,
     httpClientConfig: ((HttpClientConfig<*>) -> Unit)? = null,
@@ -33,7 +33,7 @@ import kotlinx.serialization.encoding.*
     {{#returnType}}
     @Suppress("UNCHECKED_CAST")
     {{/returnType}}
-    suspend fun {{operationId}}({{#allParams}}{{{paramName}}}: {{{dataType}}}{{^required}}?{{/required}}{{^-last}}, {{/-last}}{{/allParams}}): HttpResponse<{{{returnType}}}{{^returnType}}Unit{{/returnType}}> {
+    open suspend fun {{operationId}}({{#allParams}}{{{paramName}}}: {{{dataType}}}{{^required}}?{{/required}}{{^-last}}, {{/-last}}{{/allParams}}): HttpResponse<{{{returnType}}}{{^returnType}}Unit{{/returnType}}> {
 
         val localVariableAuthNames = listOf<String>({{#authMethods}}"{{name}}"{{^-last}}, {{/-last}}{{/authMethods}})
 

samples/client/petstore/kotlin-multiplatform/src/commonMain/kotlin/org/openapitools/client/apis/PetApi.kt

@@ -34,7 +34,7 @@ import kotlinx.serialization.*
 import kotlinx.serialization.descriptors.*
 import kotlinx.serialization.encoding.*
 
-class PetApi(
+open class PetApi(
     baseUrl: String = ApiClient.BASE_URL,
     httpClientEngine: HttpClientEngine? = null,
     httpClientConfig: ((HttpClientConfig<*>) -> Unit)? = null,
@@ -47,7 +47,7 @@ class PetApi(
      * @param body Pet object that needs to be added to the store 
      * @return void
      */
-    suspend fun addPet(body: Pet): HttpResponse<Unit> {
+    open suspend fun addPet(body: Pet): HttpResponse<Unit> {
 
         val localVariableAuthNames = listOf<String>("petstore_auth")
 
@@ -80,7 +80,7 @@ class PetApi(
      * @param apiKey  (optional)
      * @return void
      */
-    suspend fun deletePet(petId: kotlin.Long, apiKey: kotlin.String?): HttpResponse<Unit> {
+    open suspend fun deletePet(petId: kotlin.Long, apiKey: kotlin.String?): HttpResponse<Unit> {
 
         val localVariableAuthNames = listOf<String>("petstore_auth")
 
@@ -114,7 +114,7 @@ class PetApi(
      * @return kotlin.collections.List<Pet>
      */
     @Suppress("UNCHECKED_CAST")
-    suspend fun findPetsByStatus(status: kotlin.collections.List<kotlin.String>): HttpResponse<kotlin.collections.List<Pet>> {
+    open suspend fun findPetsByStatus(status: kotlin.collections.List<kotlin.String>): HttpResponse<kotlin.collections.List<Pet>> {
 
         val localVariableAuthNames = listOf<String>("petstore_auth")
 
@@ -158,7 +158,7 @@ class PetApi(
      * @return kotlin.collections.List<Pet>
      */
     @Suppress("UNCHECKED_CAST")
-    suspend fun findPetsByTags(tags: kotlin.collections.List<kotlin.String>): HttpResponse<kotlin.collections.List<Pet>> {
+    open suspend fun findPetsByTags(tags: kotlin.collections.List<kotlin.String>): HttpResponse<kotlin.collections.List<Pet>> {
 
         val localVariableAuthNames = listOf<String>("petstore_auth")
 
@@ -202,7 +202,7 @@ class PetApi(
      * @return Pet
      */
     @Suppress("UNCHECKED_CAST")
-    suspend fun getPetById(petId: kotlin.Long): HttpResponse<Pet> {
+    open suspend fun getPetById(petId: kotlin.Long): HttpResponse<Pet> {
 
         val localVariableAuthNames = listOf<String>("api_key")
 
@@ -234,7 +234,7 @@ class PetApi(
      * @param body Pet object that needs to be added to the store 
      * @return void
      */
-    suspend fun updatePet(body: Pet): HttpResponse<Unit> {
+    open suspend fun updatePet(body: Pet): HttpResponse<Unit> {
 
         val localVariableAuthNames = listOf<String>("petstore_auth")
 
@@ -268,7 +268,7 @@ class PetApi(
      * @param status Updated status of the pet (optional)
      * @return void
      */
-    suspend fun updatePetWithForm(petId: kotlin.Long, name: kotlin.String?, status: kotlin.String?): HttpResponse<Unit> {
+    open suspend fun updatePetWithForm(petId: kotlin.Long, name: kotlin.String?, status: kotlin.String?): HttpResponse<Unit> {
 
         val localVariableAuthNames = listOf<String>("petstore_auth")
 
@@ -306,7 +306,7 @@ class PetApi(
      * @return ModelApiResponse
      */
     @Suppress("UNCHECKED_CAST")
-    suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: io.ktor.client.request.forms.InputProvider?): HttpResponse<ModelApiResponse> {
+    open suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: io.ktor.client.request.forms.InputProvider?): HttpResponse<ModelApiResponse> {
 
         val localVariableAuthNames = listOf<String>("petstore_auth")
 

samples/client/petstore/kotlin-multiplatform/src/commonMain/kotlin/org/openapitools/client/apis/StoreApi.kt

@@ -33,7 +33,7 @@ import kotlinx.serialization.*
 import kotlinx.serialization.descriptors.*
 import kotlinx.serialization.encoding.*
 
-class StoreApi(
+open class StoreApi(
     baseUrl: String = ApiClient.BASE_URL,
     httpClientEngine: HttpClientEngine? = null,
     httpClientConfig: ((HttpClientConfig<*>) -> Unit)? = null,
@@ -46,7 +46,7 @@ class StoreApi(
      * @param orderId ID of the order that needs to be deleted 
      * @return void
      */
-    suspend fun deleteOrder(orderId: kotlin.String): HttpResponse<Unit> {
+    open suspend fun deleteOrder(orderId: kotlin.String): HttpResponse<Unit> {
 
         val localVariableAuthNames = listOf<String>()
 
@@ -78,7 +78,7 @@ class StoreApi(
      * @return kotlin.collections.Map<kotlin.String, kotlin.Int>
      */
     @Suppress("UNCHECKED_CAST")
-    suspend fun getInventory(): HttpResponse<kotlin.collections.Map<kotlin.String, kotlin.Int>> {
+    open suspend fun getInventory(): HttpResponse<kotlin.collections.Map<kotlin.String, kotlin.Int>> {
 
         val localVariableAuthNames = listOf<String>("api_key")
 
@@ -121,7 +121,7 @@ class StoreApi(
      * @return Order
      */
     @Suppress("UNCHECKED_CAST")
-    suspend fun getOrderById(orderId: kotlin.Long): HttpResponse<Order> {
+    open suspend fun getOrderById(orderId: kotlin.Long): HttpResponse<Order> {
 
         val localVariableAuthNames = listOf<String>()
 
@@ -154,7 +154,7 @@ class StoreApi(
      * @return Order
      */
     @Suppress("UNCHECKED_CAST")
-    suspend fun placeOrder(body: Order): HttpResponse<Order> {
+    open suspend fun placeOrder(body: Order): HttpResponse<Order> {
 
         val localVariableAuthNames = listOf<String>()
 

samples/client/petstore/kotlin-multiplatform/src/commonMain/kotlin/org/openapitools/client/apis/UserApi.kt

@@ -33,7 +33,7 @@ import kotlinx.serialization.*
 import kotlinx.serialization.descriptors.*
 import kotlinx.serialization.encoding.*
 
-class UserApi(
+open class UserApi(
     baseUrl: String = ApiClient.BASE_URL,
     httpClientEngine: HttpClientEngine? = null,
     httpClientConfig: ((HttpClientConfig<*>) -> Unit)? = null,
@@ -46,7 +46,7 @@ class UserApi(
      * @param body Created user object 
      * @return void
      */
-    suspend fun createUser(body: User): HttpResponse<Unit> {
+    open suspend fun createUser(body: User): HttpResponse<Unit> {
 
         val localVariableAuthNames = listOf<String>()
 
@@ -78,7 +78,7 @@ class UserApi(
      * @param body List of user object 
      * @return void
      */
-    suspend fun createUsersWithArrayInput(body: kotlin.collections.List<User>): HttpResponse<Unit> {
+    open suspend fun createUsersWithArrayInput(body: kotlin.collections.List<User>): HttpResponse<Unit> {
 
         val localVariableAuthNames = listOf<String>()
 
@@ -119,7 +119,7 @@ class UserApi(
      * @param body List of user object 
      * @return void
      */
-    suspend fun createUsersWithListInput(body: kotlin.collections.List<User>): HttpResponse<Unit> {
+    open suspend fun createUsersWithListInput(body: kotlin.collections.List<User>): HttpResponse<Unit> {
 
         val localVariableAuthNames = listOf<String>()
 
@@ -160,7 +160,7 @@ class UserApi(
      * @param username The name that needs to be deleted 
      * @return void
      */
-    suspend fun deleteUser(username: kotlin.String): HttpResponse<Unit> {
+    open suspend fun deleteUser(username: kotlin.String): HttpResponse<Unit> {
 
         val localVariableAuthNames = listOf<String>()
 
@@ -193,7 +193,7 @@ class UserApi(
      * @return User
      */
     @Suppress("UNCHECKED_CAST")
-    suspend fun getUserByName(username: kotlin.String): HttpResponse<User> {
+    open suspend fun getUserByName(username: kotlin.String): HttpResponse<User> {
 
         val localVariableAuthNames = listOf<String>()
 
@@ -227,7 +227,7 @@ class UserApi(
      * @return kotlin.String
      */
     @Suppress("UNCHECKED_CAST")
-    suspend fun loginUser(username: kotlin.String, password: kotlin.String): HttpResponse<kotlin.String> {
+    open suspend fun loginUser(username: kotlin.String, password: kotlin.String): HttpResponse<kotlin.String> {
 
         val localVariableAuthNames = listOf<String>()
 
@@ -260,7 +260,7 @@ class UserApi(
      * 
      * @return void
      */
-    suspend fun logoutUser(): HttpResponse<Unit> {
+    open suspend fun logoutUser(): HttpResponse<Unit> {
 
         val localVariableAuthNames = listOf<String>()
 
@@ -293,7 +293,7 @@ class UserApi(
      * @param body Updated user object 
      * @return void
      */
-    suspend fun updateUser(username: kotlin.String, body: User): HttpResponse<Unit> {
+    open suspend fun updateUser(username: kotlin.String, body: User): HttpResponse<Unit> {
 
         val localVariableAuthNames = listOf<String>()