[kotlin-spring] Handle arrays of files correctly using MultipartFile (#20108)

* [kotlin-spring] Fix no List being used for an array of files using multipart/form-data

* [kotlin-spring] Use Spring's MultipartFile class for incoming Files instead of Spring's Resource class.

* [kotlin-spring] Add test to ensure that return type for files is `org.springframework.core.io.Resource`

* [kotlin-spring] Ensure Array is used for lists of files in generated Api class

* Update samples

* [kotlin-spring] Move conditional usage of MultipartFile to optionalDataType.mustache. Update samples

* update samples

---------

Co-authored-by: William Cheng <wing328hk@gmail.com>

modules/openapi-generator/src/main/resources/kotlin-spring/apiDelegate.mustache

@@ -6,7 +6,6 @@ import org.springframework.http.HttpStatus
 import org.springframework.http.MediaType
 import org.springframework.http.ResponseEntity
 import org.springframework.web.context.request.NativeWebRequest
-import org.springframework.core.io.Resource
 {{#appendRequestToHandler}}
 import org.springframework.http.server.reactive.ServerHttpRequest
 {{/appendRequestToHandler}}
@@ -33,7 +32,7 @@ interface {{classname}}Delegate {
     /**
      * @see {{classname}}#{{operationId}}
      */
-    {{#reactive}}{{^isArray}}suspend {{/isArray}}{{/reactive}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{^isFile}}{{^reactive}}{{>optionalDataType}}{{/reactive}}{{#reactive}}{{^isArray}}{{>optionalDataType}}{{/isArray}}{{#isArray}}{{#isBodyParam}}Flow<{{{baseType}}}>{{/isBodyParam}}{{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{/isArray}}{{/reactive}}{{/isFile}}{{#isFile}}Resource?{{/isFile}}{{^-last}},
+    {{#reactive}}{{^isArray}}suspend {{/isArray}}{{/reactive}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{^reactive}}{{>optionalDataType}}{{/reactive}}{{#reactive}}{{^isArray}}{{>optionalDataType}}{{/isArray}}{{#isArray}}{{#isBodyParam}}Flow<{{{baseType}}}>{{/isBodyParam}}{{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{/isArray}}{{/reactive}}{{^-last}},
         {{/-last}}{{/allParams}}): {{#responseWrapper}}{{.}}<{{/responseWrapper}}ResponseEntity<{{>returnTypes}}>{{#responseWrapper}}>{{/responseWrapper}}{{^skipDefaultDelegateInterface}} {
         {{>methodBody}}
     }{{/skipDefaultDelegateInterface}}

modules/openapi-generator/src/main/resources/kotlin-spring/optionalDataType.mustache

@@ -1 +1 @@
-{{#required}}{{{dataType}}}{{/required}}{{^required}}{{#defaultValue}}{{{dataType}}}{{/defaultValue}}{{^defaultValue}}{{{dataType}}}?{{/defaultValue}}{{/required}}
+{{^isFile}}{{{dataType}}}{{^required}}{{^defaultValue}}?{{/defaultValue}}{{/required}}{{/isFile}}{{#isFile}}{{#isArray}}Array<{{/isArray}}org.springframework.web.multipart.MultipartFile{{#isArray}}>{{/isArray}}{{^isArray}}{{^required}}?{{/required}}{{/isArray}}{{/isFile}}

modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/spring/KotlinSpringServerCodegenTest.java

@@ -748,6 +748,75 @@ public class KotlinSpringServerCodegenTest {
         );
     }
 
+    @Test
+    public void givenMultipartFormArray_whenGenerateDelegateAndService_thenParameterIsCreatedAsListOfMultipartFile() throws IOException {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+        String outputPath = output.getAbsolutePath().replace('\\', '/');
+
+        final OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/kotlin/petstore-with-tags.yaml");
+        final KotlinSpringServerCodegen codegen = new KotlinSpringServerCodegen();
+        codegen.setOpenAPI(openAPI);
+        codegen.setOutputDir(output.getAbsolutePath());
+        codegen.setDelegatePattern(true);
+        codegen.setServiceInterface(true);
+
+        ClientOptInput input = new ClientOptInput();
+        input.openAPI(openAPI);
+        input.config(codegen);
+
+        DefaultGenerator generator = new DefaultGenerator();
+
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODELS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_TESTS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_DOCS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.APIS, "true");
+        generator.setGeneratorPropertyDefault(CodegenConstants.SUPPORTING_FILES, "false");
+
+        generator.opts(input).generate();
+
+        Path delegateFile = Paths.get(outputPath + "/src/main/kotlin/org/openapitools/api/PetApiDelegate.kt");
+        assertFileContains(delegateFile, "additionalMetadata: kotlin.String?");
+        assertFileContains(delegateFile, "images: Array<org.springframework.web.multipart.MultipartFile>");
+
+        Path controllerFile = Paths.get(outputPath + "/src/main/kotlin/org/openapitools/api/PetApi.kt");
+        assertFileContains(controllerFile, "images: Array<org.springframework.web.multipart.MultipartFile>");
+
+
+        Path serviceFile = Paths.get(outputPath + "/src/main/kotlin/org/openapitools/api/PetApiService.kt");
+        assertFileContains(serviceFile, "images: Array<org.springframework.web.multipart.MultipartFile>");
+    }
+
+    @Test
+    public void givenOctetStreamResponseType_whenGenerateServer_thenReturnTypeIsResource() throws IOException {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+        String outputPath = output.getAbsolutePath().replace('\\', '/');
+
+        final OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/kotlin/petstore-with-tags.yaml");
+        final KotlinSpringServerCodegen codegen = new KotlinSpringServerCodegen();
+        codegen.setOpenAPI(openAPI);
+        codegen.setOutputDir(output.getAbsolutePath());
+
+        ClientOptInput input = new ClientOptInput();
+        input.openAPI(openAPI);
+        input.config(codegen);
+
+        DefaultGenerator generator = new DefaultGenerator();
+
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODELS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_TESTS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_DOCS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.APIS, "true");
+        generator.setGeneratorPropertyDefault(CodegenConstants.SUPPORTING_FILES, "false");
+
+        generator.opts(input).generate();
+
+        Path outputFilepath = Paths.get(outputPath + "/src/main/kotlin/org/openapitools/api/PetApiController.kt");
+
+        assertFileContains(outputFilepath, "): ResponseEntity<org.springframework.core.io.Resource>");
+    }
+
     @Test
     public void givenMultipartForm_whenGenerateReactiveServer_thenParameterAreCreatedAsRequestPart() throws IOException {
         File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
@@ -778,7 +847,7 @@ public class KotlinSpringServerCodegenTest {
         assertFileContains(outputFilepath,
                 "@Parameter(description = \"Additional data to pass to server\") @RequestParam(value = \"additionalMetadata\", required = false) additionalMetadata: kotlin.String?");
         assertFileContains(outputFilepath,
-                           "@Parameter(description = \"image to upload\") @Valid @RequestPart(\"image\", required = false) image: org.springframework.core.io.Resource?");
+                "@Parameter(description = \"image to upload\") @Valid @RequestPart(\"image\", required = false) image: org.springframework.web.multipart.MultipartFile");
 
     }
 

modules/openapi-generator/src/test/resources/3_0/kotlin/petstore-with-tags.yaml

@@ -288,6 +288,73 @@ paths:
         - petstore_auth:
             - write:pets
             - read:pets
+  /pet/{petId}/uploadMultipleImage:
+    post:
+      tags:
+        - pet tag
+      summary: uploads multiple images
+      operationId: uploadMultipleFile
+      parameters:
+        - name: petId
+          in: path
+          description: ID of pet to update
+          required: true
+          schema:
+            type: integer
+            format: int64
+      requestBody:
+        content:
+          multipart/form-data:
+            schema:
+              properties:
+                additionalMetadata:
+                  type: string
+                  description: Additional data to pass to server
+                  required: false
+                images:
+                  type: array
+                  items:
+                    type: string
+                    description: image to upload
+                    format: binary
+                    required: true
+      responses:
+        200:
+          description: successful operation
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ApiResponse'
+      security:
+        - petstore_auth:
+            - write:pets
+            - read:pets
+  /pet/{petId}/getImage:
+    get:
+      tags:
+        - pet tag
+      summary: Get an image
+      operationId: getImage
+      parameters:
+        - name: petId
+          in: path
+          description: ID of pet to get image
+          required: true
+          schema:
+            type: integer
+            format: int64
+      responses:
+        200:
+          description: successful operation
+          content:
+            application/octet-stream:
+              schema:
+                type: string
+                format: binary
+      security:
+        - petstore_auth:
+            - write:pets
+            - read:pets
   /store/inventory:
     get:
       tags:

samples/server/petstore/kotlin-spring-cloud/src/main/kotlin/org/openapitools/api/PetApi.kt

@@ -110,7 +110,7 @@ interface PetApi {
             produces = ["application/json"],
             consumes = ["multipart/form-data"]
     )
-    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.core.io.Resource?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 }

samples/server/petstore/kotlin-spring-default/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -176,7 +176,7 @@ class PetApiController() {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.core.io.Resource?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 }

samples/server/petstore/kotlin-springboot-3/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -106,7 +106,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.core.io.Resource?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-3/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -99,5 +99,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse
+    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-3/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -34,7 +34,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse {
+    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot-delegate-nodefaults/src/main/kotlin/org/openapitools/api/PetApi.kt

@@ -199,7 +199,7 @@ interface PetApi {
             produces = ["application/json"],
             consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.core.io.Resource?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return getDelegate().uploadFile(petId, additionalMetadata, file)
     }
 }

samples/server/petstore/kotlin-springboot-delegate-nodefaults/src/main/kotlin/org/openapitools/api/PetApiDelegate.kt

@@ -6,7 +6,6 @@ import org.springframework.http.HttpStatus
 import org.springframework.http.MediaType
 import org.springframework.http.ResponseEntity
 import org.springframework.web.context.request.NativeWebRequest
-import org.springframework.core.io.Resource
 
 import java.util.Optional
 
@@ -69,6 +68,6 @@ interface PetApiDelegate {
      */
     fun uploadFile(petId: kotlin.Long,
         additionalMetadata: kotlin.String?,
-        file: Resource?): ResponseEntity<ModelApiResponse>
+        file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse>
 
 }

samples/server/petstore/kotlin-springboot-delegate-nodefaults/src/main/kotlin/org/openapitools/api/StoreApiDelegate.kt

@@ -5,7 +5,6 @@ import org.springframework.http.HttpStatus
 import org.springframework.http.MediaType
 import org.springframework.http.ResponseEntity
 import org.springframework.web.context.request.NativeWebRequest
-import org.springframework.core.io.Resource
 
 import java.util.Optional
 

samples/server/petstore/kotlin-springboot-delegate-nodefaults/src/main/kotlin/org/openapitools/api/UserApiDelegate.kt

@@ -5,7 +5,6 @@ import org.springframework.http.HttpStatus
 import org.springframework.http.MediaType
 import org.springframework.http.ResponseEntity
 import org.springframework.web.context.request.NativeWebRequest
-import org.springframework.core.io.Resource
 
 import java.util.Optional
 

samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/PetApi.kt

@@ -198,7 +198,7 @@ interface PetApi {
             produces = ["application/json"],
             consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.core.io.Resource?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return getDelegate().uploadFile(petId, additionalMetadata, file)
     }
 }

samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/PetApiDelegate.kt

@@ -6,7 +6,6 @@ import org.springframework.http.HttpStatus
 import org.springframework.http.MediaType
 import org.springframework.http.ResponseEntity
 import org.springframework.web.context.request.NativeWebRequest
-import org.springframework.core.io.Resource
 import org.springframework.http.server.reactive.ServerHttpRequest
 
 import java.util.Optional
@@ -151,7 +150,7 @@ interface PetApiDelegate {
      */
     fun uploadFile(petId: kotlin.Long,
         additionalMetadata: kotlin.String?,
-        file: Resource?): ResponseEntity<ModelApiResponse> {
+        file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         getRequest().ifPresent { request ->
             for (mediaType in MediaType.parseMediaTypes(request.getHeader("Accept"))) {
                 if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {

samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/StoreApiDelegate.kt

@@ -5,7 +5,6 @@ import org.springframework.http.HttpStatus
 import org.springframework.http.MediaType
 import org.springframework.http.ResponseEntity
 import org.springframework.web.context.request.NativeWebRequest
-import org.springframework.core.io.Resource
 import org.springframework.http.server.reactive.ServerHttpRequest
 
 import java.util.Optional

samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/UserApiDelegate.kt

@@ -5,7 +5,6 @@ import org.springframework.http.HttpStatus
 import org.springframework.http.MediaType
 import org.springframework.http.ResponseEntity
 import org.springframework.web.context.request.NativeWebRequest
-import org.springframework.core.io.Resource
 import org.springframework.http.server.reactive.ServerHttpRequest
 
 import java.util.Optional

samples/server/petstore/kotlin-springboot-modelMutable/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -172,7 +172,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.core.io.Resource?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-modelMutable/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -90,5 +90,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse
+    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-modelMutable/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -34,7 +34,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse {
+    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/MultipartMixedApiController.kt

@@ -46,7 +46,7 @@ class MultipartMixedApiController() {
         value = ["/multipart-mixed"],
         consumes = ["multipart/form-data"]
     )
-    fun multipartMixed(@Parameter(description = "", required = true, schema = Schema(allowableValues = ["ALLOWED", "IN_PROGRESS", "REJECTED"])) @RequestParam(value = "status", required = true) status: MultipartMixedStatus ,@Parameter(description = "a file") @Valid @RequestPart("file", required = true) file: org.springframework.core.io.Resource,@Parameter(description = "") @RequestPart(value = "marker", required = false) marker: MultipartMixedRequestMarker? ): ResponseEntity<Unit> {
+    fun multipartMixed(@Parameter(description = "", required = true, schema = Schema(allowableValues = ["ALLOWED", "IN_PROGRESS", "REJECTED"])) @RequestParam(value = "status", required = true) status: MultipartMixedStatus ,@Parameter(description = "a file") @Valid @RequestPart("file", required = true) file: org.springframework.web.multipart.MultipartFile,@Parameter(description = "") @RequestPart(value = "marker", required = false) marker: MultipartMixedRequestMarker? ): ResponseEntity<Unit> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 }

samples/server/petstore/kotlin-springboot-reactive/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -173,7 +173,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    suspend fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.core.io.Resource?): ResponseEntity<ModelApiResponse> {
+    suspend fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-reactive/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -91,5 +91,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse
+    suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-reactive/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -35,7 +35,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse {
+    override suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot-request-cookie/src/main/kotlin/org/openapitools/api/PetApi.kt

@@ -196,7 +196,7 @@ interface PetApi {
             produces = ["application/json"],
             consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.core.io.Resource?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 }

samples/server/petstore/kotlin-springboot-source-swagger1/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -175,7 +175,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@ApiParam(value = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@ApiParam(value = "file detail") @Valid @RequestPart("file", required = false) file: org.springframework.core.io.Resource?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@ApiParam(value = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@ApiParam(value = "file detail") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-source-swagger1/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -90,5 +90,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse
+    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-source-swagger1/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -34,7 +34,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse {
+    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot-source-swagger2/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -172,7 +172,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.core.io.Resource?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-source-swagger2/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -90,5 +90,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse
+    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-source-swagger2/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -34,7 +34,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse {
+    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot-springfox/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -175,7 +175,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@ApiParam(value = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@ApiParam(value = "file detail") @Valid @RequestPart("file", required = false) file: org.springframework.core.io.Resource?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@ApiParam(value = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@ApiParam(value = "file detail") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-springfox/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -90,5 +90,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse
+    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-springfox/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -34,7 +34,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse {
+    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -105,7 +105,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.core.io.Resource?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -90,5 +90,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse
+    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -34,7 +34,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.core.io.Resource?): ModelApiResponse {
+    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
         TODO("Implement me")
     }
 }