[GO][Client] Use a *os.File for the API Client when uploading and downloading (#14340)

* Change the return type of a file back to a pointer

* Change the api template to handle not double pointer-ing return types of os.File

* Fix unit tests

* Couple more unit test fixes

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractGoCodegen.java

@@ -121,9 +121,9 @@ public abstract class AbstractGoCodegen extends DefaultCodegen implements Codege
         typeMapping.put("date", "string");
         typeMapping.put("DateTime", "time.Time");
         typeMapping.put("password", "string");
-        typeMapping.put("File", "os.File");
-        typeMapping.put("file", "os.File");
-        typeMapping.put("binary", "os.File");
+        typeMapping.put("File", "*os.File");
+        typeMapping.put("file", "*os.File");
+        typeMapping.put("binary", "*os.File");
         typeMapping.put("ByteArray", "string");
         typeMapping.put("null", "nil");
         // A 'type: object' OAS schema without any declared property is
@@ -505,13 +505,13 @@ public abstract class AbstractGoCodegen extends DefaultCodegen implements Codege
         boolean addedReflectImport = false;
         for (CodegenOperation operation : operations) {
             // import "os" if the operation uses files
-            if (!addedOSImport && "os.File".equals(operation.returnType)) {
+            if (!addedOSImport && "*os.File".equals(operation.returnType)) {
                 imports.add(createMapping("import", "os"));
                 addedOSImport = true;
             }
             for (CodegenParameter param : operation.allParams) {
                 // import "os" if the operation uses files
-                if (!addedOSImport && "os.File".equals(param.dataType)) {
+                if (!addedOSImport && "*os.File".equals(param.dataType)) {
                     imports.add(createMapping("import", "os"));
                     addedOSImport = true;
                 }
@@ -665,8 +665,8 @@ public abstract class AbstractGoCodegen extends DefaultCodegen implements Codege
                     imports.add(createMapping("import", "time"));
                     addedTimeImport = true;
                 }
-                if (!addedOSImport && ("os.File".equals(cp.dataType) ||
-                        (cp.items != null && "os.File".equals(cp.items.dataType)))) {
+                if (!addedOSImport && ("*os.File".equals(cp.dataType) ||
+                        (cp.items != null && "*os.File".equals(cp.items.dataType)))) {
                     imports.add(createMapping("import", "os"));
                     addedOSImport = true;
                 }

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/GoServerCodegen.java

@@ -305,7 +305,7 @@ public class GoServerCodegen extends AbstractGoCodegen {
         for (CodegenOperation operation : operations) {
             for (CodegenParameter param : operation.allParams) {
                 // import "os" if the operation uses files
-                if (!addedOSImport && ("os.File".equals(param.dataType) || ("[]os.File".equals(param.dataType)))) {
+                if (!addedOSImport && ("*os.File".equals(param.dataType) || ("[]*os.File".equals(param.dataType)))) {
                     imports.add(createMapping("import", "os"));
                     addedOSImport = true;
                 }

modules/openapi-generator/src/main/resources/go-server/routers.mustache

@@ -112,22 +112,22 @@ func EncodeJSONResponse(i interface{}, status *int,{{#addResponseHeaders}} heade
 }
 
 // ReadFormFileToTempFile reads file data from a request form and writes it to a temporary file
-func ReadFormFileToTempFile(r *http.Request, key string) (os.File, error) {
+func ReadFormFileToTempFile(r *http.Request, key string) (*os.File, error) {
 	_, fileHeader, err := r.FormFile(key)
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	return readFileHeaderToTempFile(fileHeader)
 }
 
 // ReadFormFilesToTempFiles reads files array data from a request form and writes it to a temporary files
-func ReadFormFilesToTempFiles(r *http.Request, key string) ([]os.File, error) {
+func ReadFormFilesToTempFiles(r *http.Request, key string) ([]*os.File, error) {
 	if err := r.ParseMultipartForm(32 << 20); err != nil {
 		return nil, err
 	}
 
-	files := make([]os.File, 0, len(r.MultipartForm.File[key]))
+	files := make([]*os.File, 0, len(r.MultipartForm.File[key]))
 
 	for _, fileHeader := range r.MultipartForm.File[key] {
 		file, err := readFileHeaderToTempFile(fileHeader)
@@ -142,29 +142,29 @@ func ReadFormFilesToTempFiles(r *http.Request, key string) ([]os.File, error) {
 }
 
 // readFileHeaderToTempFile reads multipart.FileHeader and writes it to a temporary file
-func readFileHeaderToTempFile(fileHeader *multipart.FileHeader) (os.File, error) {
+func readFileHeaderToTempFile(fileHeader *multipart.FileHeader) (*os.File, error) {
 	formFile, err := fileHeader.Open()
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	defer formFile.Close()
 
 	fileBytes, err := ioutil.ReadAll(formFile)
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	file, err := ioutil.TempFile("", fileHeader.Filename)
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	defer file.Close()
 
 	file.Write(fileBytes)
 
-	return *file, nil
+	return file, nil
 }
 
 // parseInt64Parameter parses a string parameter to an int64.

modules/openapi-generator/src/main/resources/go/api.mustache

@@ -39,7 +39,7 @@ type {{classname}} interface {
 	{{#isDeprecated}}
 	// Deprecated
 	{{/isDeprecated}}
-	{{nickname}}Execute(r {{#structPrefix}}{{&classname}}{{/structPrefix}}{{^structPrefix}}Api{{/structPrefix}}{{operationId}}Request) ({{#returnType}}{{^isArray}}{{^returnTypeIsPrimitive}}*{{/returnTypeIsPrimitive}}{{/isArray}}{{{.}}}, {{/returnType}}*http.Response, error)
+	{{nickname}}Execute(r {{#structPrefix}}{{&classname}}{{/structPrefix}}{{^structPrefix}}Api{{/structPrefix}}{{operationId}}Request) ({{#returnType}}{{^isArray}}{{^returnTypeIsPrimitive}}{{^isResponseFile}}*{{/isResponseFile}}{{/returnTypeIsPrimitive}}{{/isArray}}{{{.}}}, {{/returnType}}*http.Response, error)
 	{{/operation}}
 }
 {{/generateInterfaces}}
@@ -55,7 +55,7 @@ type {{#structPrefix}}{{&classname}}{{/structPrefix}}{{^structPrefix}}Api{{/stru
 	ApiService *{{classname}}Service
 {{/generateInterfaces}}
 {{#allParams}}
-	{{paramName}} {{^isPathParam}}*{{/isPathParam}}{{{dataType}}}
+	{{paramName}} {{^isPathParam}}{{^isFile}}*{{/isFile}}{{/isPathParam}}{{{dataType}}}
 {{/allParams}}
 }
 
@@ -68,13 +68,13 @@ type {{#structPrefix}}{{&classname}}{{/structPrefix}}{{^structPrefix}}Api{{/stru
 // Deprecated
 {{/isDeprecated}}
 func (r {{#structPrefix}}{{&classname}}{{/structPrefix}}{{^structPrefix}}Api{{/structPrefix}}{{operationId}}Request) {{vendorExtensions.x-export-param-name}}({{paramName}} {{{dataType}}}) {{#structPrefix}}{{&classname}}{{/structPrefix}}{{^structPrefix}}Api{{/structPrefix}}{{operationId}}Request {
-	r.{{paramName}} = &{{paramName}}
+	r.{{paramName}} = {{^isFile}}&{{/isFile}}{{paramName}}
 	return r
 }
 
 {{/isPathParam}}
 {{/allParams}}
-func (r {{#structPrefix}}{{&classname}}{{/structPrefix}}{{^structPrefix}}Api{{/structPrefix}}{{operationId}}Request) Execute() ({{#returnType}}{{^isArray}}{{^returnTypeIsPrimitive}}*{{/returnTypeIsPrimitive}}{{/isArray}}{{{.}}}, {{/returnType}}*http.Response, error) {
+func (r {{#structPrefix}}{{&classname}}{{/structPrefix}}{{^structPrefix}}Api{{/structPrefix}}{{operationId}}Request) Execute() ({{#returnType}}{{^isArray}}{{^returnTypeIsPrimitive}}{{^isResponseFile}}*{{/isResponseFile}}{{/returnTypeIsPrimitive}}{{/isArray}}{{{.}}}, {{/returnType}}*http.Response, error) {
 	return r.ApiService.{{nickname}}Execute(r)
 }
 
@@ -108,13 +108,13 @@ func (a *{{{classname}}}Service) {{{nickname}}}(ctx context.Context{{#pathParams
 {{#isDeprecated}}
 // Deprecated
 {{/isDeprecated}}
-func (a *{{{classname}}}Service) {{nickname}}Execute(r {{#structPrefix}}{{&classname}}{{/structPrefix}}{{^structPrefix}}Api{{/structPrefix}}{{operationId}}Request) ({{#returnType}}{{^isArray}}{{^returnTypeIsPrimitive}}*{{/returnTypeIsPrimitive}}{{/isArray}}{{{.}}}, {{/returnType}}*http.Response, error) {
+func (a *{{{classname}}}Service) {{nickname}}Execute(r {{#structPrefix}}{{&classname}}{{/structPrefix}}{{^structPrefix}}Api{{/structPrefix}}{{operationId}}Request) ({{#returnType}}{{^isArray}}{{^returnTypeIsPrimitive}}{{^isResponseFile}}*{{/isResponseFile}}{{/returnTypeIsPrimitive}}{{/isArray}}{{{.}}}, {{/returnType}}*http.Response, error) {
 	var (
 		localVarHTTPMethod   = http.Method{{httpMethod}}
 		localVarPostBody     interface{}
 		formFiles            []formFile
 		{{#returnType}}
-		localVarReturnValue  {{^isArray}}{{^returnTypeIsPrimitive}}*{{/returnTypeIsPrimitive}}{{/isArray}}{{{.}}}
+		localVarReturnValue  {{^isArray}}{{^returnTypeIsPrimitive}}{{^isResponseFile}}*{{/isResponseFile}}{{/returnTypeIsPrimitive}}{{/isArray}}{{{.}}}
 		{{/returnType}}
 	)
 
@@ -258,27 +258,17 @@ func (a *{{{classname}}}Service) {{nickname}}Execute(r {{#structPrefix}}{{&class
 
 	{{paramName}}LocalVarFormFileName = "{{baseName}}"
 
-{{#required}}
+
 	{{paramName}}LocalVarFile := r.{{paramName}}
-{{/required}}
-{{^required}}
-	var {{paramName}}LocalVarFile *{{dataType}}
-	if r.{{paramName}} != nil {
-		{{paramName}}LocalVarFile = r.{{paramName}}
-	}
+
 	if {{paramName}}LocalVarFile != nil {
 		fbs, _ := ioutil.ReadAll({{paramName}}LocalVarFile)
-		{{/required}}
-		{{#required}}
-				fbs, _ := ioutil.ReadAll({{paramName}}LocalVarFile)
-		{{/required}}
+
 		{{paramName}}LocalVarFileBytes = fbs
 		{{paramName}}LocalVarFileName = {{paramName}}LocalVarFile.Name()
 		{{paramName}}LocalVarFile.Close()
-	{{^required}}
+		formFiles = append(formFiles, formFile{fileBytes: {{paramName}}LocalVarFileBytes, fileName: {{paramName}}LocalVarFileName, formFileName: {{paramName}}LocalVarFormFileName})
 	}
-	{{/required}}
-	formFiles = append(formFiles, formFile{fileBytes: {{paramName}}LocalVarFileBytes, fileName: {{paramName}}LocalVarFileName, formFileName: {{paramName}}LocalVarFormFileName})
 {{/isFile}}
 {{^isFile}}
 {{#required}}

modules/openapi-generator/src/test/java/org/openapitools/codegen/go/GoModelTest.java

@@ -262,8 +262,8 @@ public class GoModelTest {
     public void filePropertyTest() {
         final DefaultCodegen codegen = new GoClientCodegen();
         final Schema model1 = new Schema().type("file");
-        Assert.assertEquals(codegen.getSchemaType(model1), "os.File");
-        Assert.assertEquals(codegen.getTypeDeclaration(model1), "os.File");
+        Assert.assertEquals(codegen.getSchemaType(model1), "*os.File");
+        Assert.assertEquals(codegen.getTypeDeclaration(model1), "*os.File");
 
         final Schema model2 = new Schema().$ref("#/definitions/File");
         Assert.assertEquals(codegen.getSchemaType(model2), "File");

samples/client/petstore/go/go-petstore/api_fake.go

@@ -1135,8 +1135,8 @@ func (r ApiTestEndpointParametersRequest) String_(string_ string) ApiTestEndpoin
 }
 
 // None
-func (r ApiTestEndpointParametersRequest) Binary(binary os.File) ApiTestEndpointParametersRequest {
-	r.binary = &binary
+func (r ApiTestEndpointParametersRequest) Binary(binary *os.File) ApiTestEndpointParametersRequest {
+	r.binary = binary
 	return r
 }
 
@@ -1271,17 +1271,17 @@ func (a *FakeApiService) TestEndpointParametersExecute(r ApiTestEndpointParamete
 
 	binaryLocalVarFormFileName = "binary"
 
-	var binaryLocalVarFile *os.File
-	if r.binary != nil {
-		binaryLocalVarFile = r.binary
-	}
+
+	binaryLocalVarFile := r.binary
+
 	if binaryLocalVarFile != nil {
 		fbs, _ := ioutil.ReadAll(binaryLocalVarFile)
+
 		binaryLocalVarFileBytes = fbs
 		binaryLocalVarFileName = binaryLocalVarFile.Name()
 		binaryLocalVarFile.Close()
+		formFiles = append(formFiles, formFile{fileBytes: binaryLocalVarFileBytes, fileName: binaryLocalVarFileName, formFileName: binaryLocalVarFormFileName})
 	}
-	formFiles = append(formFiles, formFile{fileBytes: binaryLocalVarFileBytes, fileName: binaryLocalVarFileName, formFileName: binaryLocalVarFormFileName})
 	if r.date != nil {
 		parameterAddToQuery(localVarFormParams, "date", r.date, "")
 	}

samples/client/petstore/go/go-petstore/api_pet.go

@@ -905,8 +905,8 @@ func (r ApiUploadFileRequest) AdditionalMetadata(additionalMetadata string) ApiU
 }
 
 // file to upload
-func (r ApiUploadFileRequest) File(file os.File) ApiUploadFileRequest {
-	r.file = &file
+func (r ApiUploadFileRequest) File(file *os.File) ApiUploadFileRequest {
+	r.file = file
 	return r
 }
 
@@ -977,17 +977,17 @@ func (a *PetApiService) UploadFileExecute(r ApiUploadFileRequest) (*ApiResponse,
 
 	fileLocalVarFormFileName = "file"
 
-	var fileLocalVarFile *os.File
-	if r.file != nil {
-		fileLocalVarFile = r.file
-	}
+
+	fileLocalVarFile := r.file
+
 	if fileLocalVarFile != nil {
 		fbs, _ := ioutil.ReadAll(fileLocalVarFile)
+
 		fileLocalVarFileBytes = fbs
 		fileLocalVarFileName = fileLocalVarFile.Name()
 		fileLocalVarFile.Close()
+		formFiles = append(formFiles, formFile{fileBytes: fileLocalVarFileBytes, fileName: fileLocalVarFileName, formFileName: fileLocalVarFormFileName})
 	}
-	formFiles = append(formFiles, formFile{fileBytes: fileLocalVarFileBytes, fileName: fileLocalVarFileName, formFileName: fileLocalVarFormFileName})
 	req, err := a.client.prepareRequest(r.ctx, localVarPath, localVarHTTPMethod, localVarPostBody, localVarHeaderParams, localVarQueryParams, localVarFormParams, formFiles)
 	if err != nil {
 		return localVarReturnValue, nil, err
@@ -1034,8 +1034,8 @@ type ApiUploadFileWithRequiredFileRequest struct {
 }
 
 // file to upload
-func (r ApiUploadFileWithRequiredFileRequest) RequiredFile(requiredFile os.File) ApiUploadFileWithRequiredFileRequest {
-	r.requiredFile = &requiredFile
+func (r ApiUploadFileWithRequiredFileRequest) RequiredFile(requiredFile *os.File) ApiUploadFileWithRequiredFileRequest {
+	r.requiredFile = requiredFile
 	return r
 }
 
@@ -1115,12 +1115,17 @@ func (a *PetApiService) UploadFileWithRequiredFileExecute(r ApiUploadFileWithReq
 
 	requiredFileLocalVarFormFileName = "requiredFile"
 
+
 	requiredFileLocalVarFile := r.requiredFile
-				fbs, _ := ioutil.ReadAll(requiredFileLocalVarFile)
+
+	if requiredFileLocalVarFile != nil {
+		fbs, _ := ioutil.ReadAll(requiredFileLocalVarFile)
+
 		requiredFileLocalVarFileBytes = fbs
 		requiredFileLocalVarFileName = requiredFileLocalVarFile.Name()
 		requiredFileLocalVarFile.Close()
-	formFiles = append(formFiles, formFile{fileBytes: requiredFileLocalVarFileBytes, fileName: requiredFileLocalVarFileName, formFileName: requiredFileLocalVarFormFileName})
+		formFiles = append(formFiles, formFile{fileBytes: requiredFileLocalVarFileBytes, fileName: requiredFileLocalVarFileName, formFileName: requiredFileLocalVarFormFileName})
+	}
 	req, err := a.client.prepareRequest(r.ctx, localVarPath, localVarHTTPMethod, localVarPostBody, localVarHeaderParams, localVarQueryParams, localVarFormParams, formFiles)
 	if err != nil {
 		return localVarReturnValue, nil, err

samples/client/petstore/go/go-petstore/docs/FakeApi.md

@@ -574,7 +574,7 @@ func main() {
     int64_ := int64(789) // int64 | None (optional)
     float := float32(3.4) // float32 | None (optional)
     string_ := "string__example" // string | None (optional)
-    binary := os.NewFile(1234, "some_file") // os.File | None (optional)
+    binary := os.NewFile(1234, "some_file") // *os.File | None (optional)
     date := time.Now() // string | None (optional)
     dateTime := time.Now() // time.Time | None (optional)
     password := "password_example" // string | None (optional)
@@ -610,7 +610,7 @@ Name | Type | Description  | Notes
  **int64_** | **int64** | None | 
  **float** | **float32** | None | 
  **string_** | **string** | None | 
- **binary** | **os.File** | None | 
+ **binary** | ***os.File** | None | 
  **date** | **string** | None | 
  **dateTime** | **time.Time** | None | 
  **password** | **string** | None | 

samples/client/petstore/go/go-petstore/docs/FormatTest.md

@@ -12,7 +12,7 @@ Name | Type | Description | Notes
 **Double** | Pointer to **float64** |  | [optional] 
 **String** | Pointer to **string** |  | [optional] 
 **Byte** | **string** |  | 
-**Binary** | Pointer to **os.File** |  | [optional] 
+**Binary** | Pointer to ***os.File** |  | [optional] 
 **Date** | **string** |  | 
 **DateTime** | Pointer to **time.Time** |  | [optional] 
 **Uuid** | Pointer to **string** |  | [optional] 
@@ -230,20 +230,20 @@ SetByte sets Byte field to given value.
 
 ### GetBinary
 
-`func (o *FormatTest) GetBinary() os.File`
+`func (o *FormatTest) GetBinary() *os.File`
 
 GetBinary returns the Binary field if non-nil, zero value otherwise.
 
 ### GetBinaryOk
 
-`func (o *FormatTest) GetBinaryOk() (*os.File, bool)`
+`func (o *FormatTest) GetBinaryOk() (**os.File, bool)`
 
 GetBinaryOk returns a tuple with the Binary field if it's non-nil, zero value otherwise
 and a boolean to check if the value has been set.
 
 ### SetBinary
 
-`func (o *FormatTest) SetBinary(v os.File)`
+`func (o *FormatTest) SetBinary(v *os.File)`
 
 SetBinary sets Binary field to given value.
 

samples/client/petstore/go/go-petstore/docs/PetApi.md

@@ -501,7 +501,7 @@ import (
 func main() {
     petId := int64(789) // int64 | ID of pet to update
     additionalMetadata := "additionalMetadata_example" // string | Additional data to pass to server (optional)
-    file := os.NewFile(1234, "some_file") // os.File | file to upload (optional)
+    file := os.NewFile(1234, "some_file") // *os.File | file to upload (optional)
 
     configuration := openapiclient.NewConfiguration()
     apiClient := openapiclient.NewAPIClient(configuration)
@@ -532,7 +532,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
 
  **additionalMetadata** | **string** | Additional data to pass to server | 
- **file** | **os.File** | file to upload | 
+ **file** | ***os.File** | file to upload | 
 
 ### Return type
 
@@ -572,7 +572,7 @@ import (
 
 func main() {
     petId := int64(789) // int64 | ID of pet to update
-    requiredFile := os.NewFile(1234, "some_file") // os.File | file to upload
+    requiredFile := os.NewFile(1234, "some_file") // *os.File | file to upload
     additionalMetadata := "additionalMetadata_example" // string | Additional data to pass to server (optional)
 
     configuration := openapiclient.NewConfiguration()
@@ -603,7 +603,7 @@ Other parameters are passed through a pointer to a apiUploadFileWithRequiredFile
 Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
 
- **requiredFile** | **os.File** | file to upload | 
+ **requiredFile** | ***os.File** | file to upload | 
  **additionalMetadata** | **string** | Additional data to pass to server | 
 
 ### Return type

samples/client/petstore/go/go-petstore/model_format_test_.go

@@ -29,7 +29,7 @@ type FormatTest struct {
 	Double *float64 `json:"double,omitempty"`
 	String *string `json:"string,omitempty"`
 	Byte string `json:"byte"`
-	Binary *os.File `json:"binary,omitempty"`
+	Binary **os.File `json:"binary,omitempty"`
 	Date string `json:"date"`
 	DateTime *time.Time `json:"dateTime,omitempty"`
 	Uuid *string `json:"uuid,omitempty"`
@@ -299,9 +299,9 @@ func (o *FormatTest) SetByte(v string) {
 }
 
 // GetBinary returns the Binary field value if set, zero value otherwise.
-func (o *FormatTest) GetBinary() os.File {
+func (o *FormatTest) GetBinary() *os.File {
 	if o == nil || isNil(o.Binary) {
-		var ret os.File
+		var ret *os.File
 		return ret
 	}
 	return *o.Binary
@@ -309,7 +309,7 @@ func (o *FormatTest) GetBinary() os.File {
 
 // GetBinaryOk returns a tuple with the Binary field value if set, nil otherwise
 // and a boolean to check if the value has been set.
-func (o *FormatTest) GetBinaryOk() (*os.File, bool) {
+func (o *FormatTest) GetBinaryOk() (**os.File, bool) {
 	if o == nil || isNil(o.Binary) {
 		return nil, false
 	}
@@ -325,8 +325,8 @@ func (o *FormatTest) HasBinary() bool {
 	return false
 }
 
-// SetBinary gets a reference to the given os.File and assigns it to the Binary field.
-func (o *FormatTest) SetBinary(v os.File) {
+// SetBinary gets a reference to the given *os.File and assigns it to the Binary field.
+func (o *FormatTest) SetBinary(v *os.File) {
 	o.Binary = &v
 }
 

samples/client/petstore/go/pet_api_test.go

@@ -154,7 +154,7 @@ func TestUploadFile(t *testing.T) {
 		t.Fatalf("Error opening file: %v", err1)
 	}
 
-	_, r, err := client.PetApi.UploadFile(context.Background(), 12830).AdditionalMetadata("golang").File(*file).Execute()
+	_, r, err := client.PetApi.UploadFile(context.Background(), 12830).AdditionalMetadata("golang").File(file).Execute()
 
 	if err != nil {
 		t.Fatalf("Error while uploading file: %v", err)
@@ -172,7 +172,7 @@ func TestUploadFileRequired(t *testing.T) {
 		t.Fatalf("Error opening file: %v", err1)
 	}
 
-	_, r, err := client.PetApi.UploadFileWithRequiredFile(context.Background(), 12830).RequiredFile(*file).AdditionalMetadata("golang").Execute()
+	_, r, err := client.PetApi.UploadFileWithRequiredFile(context.Background(), 12830).RequiredFile(file).AdditionalMetadata("golang").Execute()
 
 	if err != nil {
 		t.Fatalf("Error while uploading file: %v", err)

samples/openapi3/client/petstore/go/go-petstore/api_fake.go

@@ -1161,8 +1161,8 @@ func (r ApiTestEndpointParametersRequest) String_(string_ string) ApiTestEndpoin
 }
 
 // None
-func (r ApiTestEndpointParametersRequest) Binary(binary os.File) ApiTestEndpointParametersRequest {
-	r.binary = &binary
+func (r ApiTestEndpointParametersRequest) Binary(binary *os.File) ApiTestEndpointParametersRequest {
+	r.binary = binary
 	return r
 }
 
@@ -1298,17 +1298,17 @@ func (a *FakeApiService) TestEndpointParametersExecute(r ApiTestEndpointParamete
 
 	binaryLocalVarFormFileName = "binary"
 
-	var binaryLocalVarFile *os.File
-	if r.binary != nil {
-		binaryLocalVarFile = r.binary
-	}
+
+	binaryLocalVarFile := r.binary
+
 	if binaryLocalVarFile != nil {
 		fbs, _ := ioutil.ReadAll(binaryLocalVarFile)
+
 		binaryLocalVarFileBytes = fbs
 		binaryLocalVarFileName = binaryLocalVarFile.Name()
 		binaryLocalVarFile.Close()
+		formFiles = append(formFiles, formFile{fileBytes: binaryLocalVarFileBytes, fileName: binaryLocalVarFileName, formFileName: binaryLocalVarFormFileName})
 	}
-	formFiles = append(formFiles, formFile{fileBytes: binaryLocalVarFileBytes, fileName: binaryLocalVarFileName, formFileName: binaryLocalVarFormFileName})
 	if r.date != nil {
 		parameterAddToQuery(localVarFormParams, "date", r.date, "")
 	}

samples/openapi3/client/petstore/go/go-petstore/api_pet.go

@@ -926,8 +926,8 @@ func (r ApiUploadFileRequest) AdditionalMetadata(additionalMetadata string) ApiU
 }
 
 // file to upload
-func (r ApiUploadFileRequest) File(file os.File) ApiUploadFileRequest {
-	r.file = &file
+func (r ApiUploadFileRequest) File(file *os.File) ApiUploadFileRequest {
+	r.file = file
 	return r
 }
 
@@ -1000,17 +1000,17 @@ func (a *PetApiService) UploadFileExecute(r ApiUploadFileRequest) (*ApiResponse,
 
 	fileLocalVarFormFileName = "file"
 
-	var fileLocalVarFile *os.File
-	if r.file != nil {
-		fileLocalVarFile = r.file
-	}
+
+	fileLocalVarFile := r.file
+
 	if fileLocalVarFile != nil {
 		fbs, _ := ioutil.ReadAll(fileLocalVarFile)
+
 		fileLocalVarFileBytes = fbs
 		fileLocalVarFileName = fileLocalVarFile.Name()
 		fileLocalVarFile.Close()
+		formFiles = append(formFiles, formFile{fileBytes: fileLocalVarFileBytes, fileName: fileLocalVarFileName, formFileName: fileLocalVarFormFileName})
 	}
-	formFiles = append(formFiles, formFile{fileBytes: fileLocalVarFileBytes, fileName: fileLocalVarFileName, formFileName: fileLocalVarFormFileName})
 	req, err := a.client.prepareRequest(r.ctx, localVarPath, localVarHTTPMethod, localVarPostBody, localVarHeaderParams, localVarQueryParams, localVarFormParams, formFiles)
 	if err != nil {
 		return localVarReturnValue, nil, err
@@ -1057,8 +1057,8 @@ type ApiUploadFileWithRequiredFileRequest struct {
 }
 
 // file to upload
-func (r ApiUploadFileWithRequiredFileRequest) RequiredFile(requiredFile os.File) ApiUploadFileWithRequiredFileRequest {
-	r.requiredFile = &requiredFile
+func (r ApiUploadFileWithRequiredFileRequest) RequiredFile(requiredFile *os.File) ApiUploadFileWithRequiredFileRequest {
+	r.requiredFile = requiredFile
 	return r
 }
 
@@ -1140,12 +1140,17 @@ func (a *PetApiService) UploadFileWithRequiredFileExecute(r ApiUploadFileWithReq
 
 	requiredFileLocalVarFormFileName = "requiredFile"
 
+
 	requiredFileLocalVarFile := r.requiredFile
-				fbs, _ := ioutil.ReadAll(requiredFileLocalVarFile)
+
+	if requiredFileLocalVarFile != nil {
+		fbs, _ := ioutil.ReadAll(requiredFileLocalVarFile)
+
 		requiredFileLocalVarFileBytes = fbs
 		requiredFileLocalVarFileName = requiredFileLocalVarFile.Name()
 		requiredFileLocalVarFile.Close()
-	formFiles = append(formFiles, formFile{fileBytes: requiredFileLocalVarFileBytes, fileName: requiredFileLocalVarFileName, formFileName: requiredFileLocalVarFormFileName})
+		formFiles = append(formFiles, formFile{fileBytes: requiredFileLocalVarFileBytes, fileName: requiredFileLocalVarFileName, formFileName: requiredFileLocalVarFormFileName})
+	}
 	req, err := a.client.prepareRequest(r.ctx, localVarPath, localVarHTTPMethod, localVarPostBody, localVarHeaderParams, localVarQueryParams, localVarFormParams, formFiles)
 	if err != nil {
 		return localVarReturnValue, nil, err

samples/openapi3/client/petstore/go/go-petstore/docs/FakeApi.md

@@ -571,7 +571,7 @@ func main() {
     int64_ := int64(789) // int64 | None (optional)
     float := float32(3.4) // float32 | None (optional)
     string_ := "string__example" // string | None (optional)
-    binary := os.NewFile(1234, "some_file") // os.File | None (optional)
+    binary := os.NewFile(1234, "some_file") // *os.File | None (optional)
     date := time.Now() // string | None (optional)
     dateTime := time.Now() // time.Time | None (optional)
     password := "password_example" // string | None (optional)
@@ -607,7 +607,7 @@ Name | Type | Description  | Notes
  **int64_** | **int64** | None | 
  **float** | **float32** | None | 
  **string_** | **string** | None | 
- **binary** | **os.File** | None | 
+ **binary** | ***os.File** | None | 
  **date** | **string** | None | 
  **dateTime** | **time.Time** | None | 
  **password** | **string** | None | 

samples/openapi3/client/petstore/go/go-petstore/docs/FormatTest.md

@@ -12,7 +12,7 @@ Name | Type | Description | Notes
 **Double** | Pointer to **float64** |  | [optional] 
 **String** | Pointer to **string** |  | [optional] 
 **Byte** | **string** |  | 
-**Binary** | Pointer to **os.File** |  | [optional] 
+**Binary** | Pointer to ***os.File** |  | [optional] 
 **Date** | **string** |  | 
 **DateTime** | Pointer to **time.Time** |  | [optional] 
 **Uuid** | Pointer to **string** |  | [optional] 
@@ -231,20 +231,20 @@ SetByte sets Byte field to given value.
 
 ### GetBinary
 
-`func (o *FormatTest) GetBinary() os.File`
+`func (o *FormatTest) GetBinary() *os.File`
 
 GetBinary returns the Binary field if non-nil, zero value otherwise.
 
 ### GetBinaryOk
 
-`func (o *FormatTest) GetBinaryOk() (*os.File, bool)`
+`func (o *FormatTest) GetBinaryOk() (**os.File, bool)`
 
 GetBinaryOk returns a tuple with the Binary field if it's non-nil, zero value otherwise
 and a boolean to check if the value has been set.
 
 ### SetBinary
 
-`func (o *FormatTest) SetBinary(v os.File)`
+`func (o *FormatTest) SetBinary(v *os.File)`
 
 SetBinary sets Binary field to given value.
 

samples/openapi3/client/petstore/go/go-petstore/docs/MapOfFileTest.md

@@ -4,7 +4,7 @@
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**PropTest** | Pointer to **map[string]os.File** | a property to test map of file | [optional] 
+**PropTest** | Pointer to **map[string]*os.File** | a property to test map of file | [optional] 
 
 ## Methods
 
@@ -27,20 +27,20 @@ but it doesn't guarantee that properties required by API are set
 
 ### GetPropTest
 
-`func (o *MapOfFileTest) GetPropTest() map[string]os.File`
+`func (o *MapOfFileTest) GetPropTest() map[string]*os.File`
 
 GetPropTest returns the PropTest field if non-nil, zero value otherwise.
 
 ### GetPropTestOk
 
-`func (o *MapOfFileTest) GetPropTestOk() (*map[string]os.File, bool)`
+`func (o *MapOfFileTest) GetPropTestOk() (*map[string]*os.File, bool)`
 
 GetPropTestOk returns a tuple with the PropTest field if it's non-nil, zero value otherwise
 and a boolean to check if the value has been set.
 
 ### SetPropTest
 
-`func (o *MapOfFileTest) SetPropTest(v map[string]os.File)`
+`func (o *MapOfFileTest) SetPropTest(v map[string]*os.File)`
 
 SetPropTest sets PropTest field to given value.
 

samples/openapi3/client/petstore/go/go-petstore/docs/PetApi.md

@@ -511,7 +511,7 @@ import (
 func main() {
     petId := int64(789) // int64 | ID of pet to update
     additionalMetadata := "additionalMetadata_example" // string | Additional data to pass to server (optional)
-    file := os.NewFile(1234, "some_file") // os.File | file to upload (optional)
+    file := os.NewFile(1234, "some_file") // *os.File | file to upload (optional)
 
     configuration := openapiclient.NewConfiguration()
     apiClient := openapiclient.NewAPIClient(configuration)
@@ -542,7 +542,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
 
  **additionalMetadata** | **string** | Additional data to pass to server | 
- **file** | **os.File** | file to upload | 
+ **file** | ***os.File** | file to upload | 
 
 ### Return type
 
@@ -584,7 +584,7 @@ import (
 
 func main() {
     petId := int64(789) // int64 | ID of pet to update
-    requiredFile := os.NewFile(1234, "some_file") // os.File | file to upload
+    requiredFile := os.NewFile(1234, "some_file") // *os.File | file to upload
     additionalMetadata := "additionalMetadata_example" // string | Additional data to pass to server (optional)
 
     configuration := openapiclient.NewConfiguration()
@@ -615,7 +615,7 @@ Other parameters are passed through a pointer to a apiUploadFileWithRequiredFile
 Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
 
- **requiredFile** | **os.File** | file to upload | 
+ **requiredFile** | ***os.File** | file to upload | 
  **additionalMetadata** | **string** | Additional data to pass to server | 
 
 ### Return type

samples/openapi3/client/petstore/go/go-petstore/model_format_test_.go

@@ -29,7 +29,7 @@ type FormatTest struct {
 	Double *float64 `json:"double,omitempty"`
 	String *string `json:"string,omitempty"`
 	Byte string `json:"byte"`
-	Binary *os.File `json:"binary,omitempty"`
+	Binary **os.File `json:"binary,omitempty"`
 	Date string `json:"date"`
 	DateTime *time.Time `json:"dateTime,omitempty"`
 	Uuid *string `json:"uuid,omitempty"`
@@ -305,9 +305,9 @@ func (o *FormatTest) SetByte(v string) {
 }
 
 // GetBinary returns the Binary field value if set, zero value otherwise.
-func (o *FormatTest) GetBinary() os.File {
+func (o *FormatTest) GetBinary() *os.File {
 	if o == nil || isNil(o.Binary) {
-		var ret os.File
+		var ret *os.File
 		return ret
 	}
 	return *o.Binary
@@ -315,7 +315,7 @@ func (o *FormatTest) GetBinary() os.File {
 
 // GetBinaryOk returns a tuple with the Binary field value if set, nil otherwise
 // and a boolean to check if the value has been set.
-func (o *FormatTest) GetBinaryOk() (*os.File, bool) {
+func (o *FormatTest) GetBinaryOk() (**os.File, bool) {
 	if o == nil || isNil(o.Binary) {
 		return nil, false
 	}
@@ -331,8 +331,8 @@ func (o *FormatTest) HasBinary() bool {
 	return false
 }
 
-// SetBinary gets a reference to the given os.File and assigns it to the Binary field.
-func (o *FormatTest) SetBinary(v os.File) {
+// SetBinary gets a reference to the given *os.File and assigns it to the Binary field.
+func (o *FormatTest) SetBinary(v *os.File) {
 	o.Binary = &v
 }
 

samples/openapi3/client/petstore/go/go-petstore/model_map_of_file_test_.go

@@ -21,7 +21,7 @@ var _ MappedNullable = &MapOfFileTest{}
 // MapOfFileTest test map of file in a property
 type MapOfFileTest struct {
 	// a property to test map of file
-	PropTest *map[string]os.File `json:"prop_test,omitempty"`
+	PropTest *map[string]*os.File `json:"prop_test,omitempty"`
 	AdditionalProperties map[string]interface{}
 }
 
@@ -45,9 +45,9 @@ func NewMapOfFileTestWithDefaults() *MapOfFileTest {
 }
 
 // GetPropTest returns the PropTest field value if set, zero value otherwise.
-func (o *MapOfFileTest) GetPropTest() map[string]os.File {
+func (o *MapOfFileTest) GetPropTest() map[string]*os.File {
 	if o == nil || isNil(o.PropTest) {
-		var ret map[string]os.File
+		var ret map[string]*os.File
 		return ret
 	}
 	return *o.PropTest
@@ -55,7 +55,7 @@ func (o *MapOfFileTest) GetPropTest() map[string]os.File {
 
 // GetPropTestOk returns a tuple with the PropTest field value if set, nil otherwise
 // and a boolean to check if the value has been set.
-func (o *MapOfFileTest) GetPropTestOk() (*map[string]os.File, bool) {
+func (o *MapOfFileTest) GetPropTestOk() (*map[string]*os.File, bool) {
 	if o == nil || isNil(o.PropTest) {
 		return nil, false
 	}
@@ -71,8 +71,8 @@ func (o *MapOfFileTest) HasPropTest() bool {
 	return false
 }
 
-// SetPropTest gets a reference to the given map[string]os.File and assigns it to the PropTest field.
-func (o *MapOfFileTest) SetPropTest(v map[string]os.File) {
+// SetPropTest gets a reference to the given map[string]*os.File and assigns it to the PropTest field.
+func (o *MapOfFileTest) SetPropTest(v map[string]*os.File) {
 	o.PropTest = &v
 }
 

samples/openapi3/client/petstore/go/pet_api_test.go

@@ -144,7 +144,7 @@ func TestUploadFile(t *testing.T) {
 		t.Fatalf("Error opening file: %v", err1)
 	}
 
-	_, r, err := client.PetApi.UploadFile(context.Background(), 12830).AdditionalMetadata("golang").File(*file).Execute()
+	_, r, err := client.PetApi.UploadFile(context.Background(), 12830).AdditionalMetadata("golang").File(file).Execute()
 
 	if err != nil {
 		t.Fatalf("Error while uploading file: %v", err)
@@ -162,7 +162,7 @@ func TestUploadFileRequired(t *testing.T) {
 		t.Fatalf("Error opening file: %v", err1)
 	}
 
-	_, r, err := client.PetApi.UploadFileWithRequiredFile(context.Background(), 12830).RequiredFile(*file).AdditionalMetadata("golang").Execute()
+	_, r, err := client.PetApi.UploadFileWithRequiredFile(context.Background(), 12830).RequiredFile(file).AdditionalMetadata("golang").Execute()
 
 	if err != nil {
 		t.Fatalf("Error while uploading file: %v", err)

samples/server/petstore/go-api-server/go/api.go

@@ -68,7 +68,7 @@ type PetApiServicer interface {
 	GetPetById(context.Context, int64) (ImplResponse, error)
 	UpdatePet(context.Context, Pet) (ImplResponse, error)
 	UpdatePetWithForm(context.Context, int64, string, string) (ImplResponse, error)
-	UploadFile(context.Context, int64, string, os.File) (ImplResponse, error)
+	UploadFile(context.Context, int64, string, *os.File) (ImplResponse, error)
 }
 
 

samples/server/petstore/go-api-server/go/api_pet_service.go

@@ -130,7 +130,7 @@ func (s *PetApiService) UpdatePetWithForm(ctx context.Context, petId int64, name
 }
 
 // UploadFile - uploads an image
-func (s *PetApiService) UploadFile(ctx context.Context, petId int64, additionalMetadata string, file os.File) (ImplResponse, error) {
+func (s *PetApiService) UploadFile(ctx context.Context, petId int64, additionalMetadata string, file *os.File) (ImplResponse, error) {
 	// TODO - update UploadFile with the required logic for this service method.
 	// Add api_pet_service.go to the .openapi-generator-ignore to avoid overwriting this service implementation when updating open api generation.
 

samples/server/petstore/go-api-server/go/routers.go

@@ -80,22 +80,22 @@ func EncodeJSONResponse(i interface{}, status *int, headers map[string][]string,
 }
 
 // ReadFormFileToTempFile reads file data from a request form and writes it to a temporary file
-func ReadFormFileToTempFile(r *http.Request, key string) (os.File, error) {
+func ReadFormFileToTempFile(r *http.Request, key string) (*os.File, error) {
 	_, fileHeader, err := r.FormFile(key)
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	return readFileHeaderToTempFile(fileHeader)
 }
 
 // ReadFormFilesToTempFiles reads files array data from a request form and writes it to a temporary files
-func ReadFormFilesToTempFiles(r *http.Request, key string) ([]os.File, error) {
+func ReadFormFilesToTempFiles(r *http.Request, key string) ([]*os.File, error) {
 	if err := r.ParseMultipartForm(32 << 20); err != nil {
 		return nil, err
 	}
 
-	files := make([]os.File, 0, len(r.MultipartForm.File[key]))
+	files := make([]*os.File, 0, len(r.MultipartForm.File[key]))
 
 	for _, fileHeader := range r.MultipartForm.File[key] {
 		file, err := readFileHeaderToTempFile(fileHeader)
@@ -110,29 +110,29 @@ func ReadFormFilesToTempFiles(r *http.Request, key string) ([]os.File, error) {
 }
 
 // readFileHeaderToTempFile reads multipart.FileHeader and writes it to a temporary file
-func readFileHeaderToTempFile(fileHeader *multipart.FileHeader) (os.File, error) {
+func readFileHeaderToTempFile(fileHeader *multipart.FileHeader) (*os.File, error) {
 	formFile, err := fileHeader.Open()
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	defer formFile.Close()
 
 	fileBytes, err := ioutil.ReadAll(formFile)
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	file, err := ioutil.TempFile("", fileHeader.Filename)
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	defer file.Close()
 
 	file.Write(fileBytes)
 
-	return *file, nil
+	return file, nil
 }
 
 // parseInt64Parameter parses a string parameter to an int64.

samples/server/petstore/go-chi-server/go/api.go

@@ -68,7 +68,7 @@ type PetApiServicer interface {
 	GetPetById(context.Context, int64) (ImplResponse, error)
 	UpdatePet(context.Context, Pet) (ImplResponse, error)
 	UpdatePetWithForm(context.Context, int64, string, string) (ImplResponse, error)
-	UploadFile(context.Context, int64, string, os.File) (ImplResponse, error)
+	UploadFile(context.Context, int64, string, *os.File) (ImplResponse, error)
 }
 
 

samples/server/petstore/go-chi-server/go/api_pet_service.go

@@ -130,7 +130,7 @@ func (s *PetApiService) UpdatePetWithForm(ctx context.Context, petId int64, name
 }
 
 // UploadFile - uploads an image
-func (s *PetApiService) UploadFile(ctx context.Context, petId int64, additionalMetadata string, file os.File) (ImplResponse, error) {
+func (s *PetApiService) UploadFile(ctx context.Context, petId int64, additionalMetadata string, file *os.File) (ImplResponse, error) {
 	// TODO - update UploadFile with the required logic for this service method.
 	// Add api_pet_service.go to the .openapi-generator-ignore to avoid overwriting this service implementation when updating open api generation.
 

samples/server/petstore/go-chi-server/go/routers.go

@@ -76,22 +76,22 @@ func EncodeJSONResponse(i interface{}, status *int, headers map[string][]string,
 }
 
 // ReadFormFileToTempFile reads file data from a request form and writes it to a temporary file
-func ReadFormFileToTempFile(r *http.Request, key string) (os.File, error) {
+func ReadFormFileToTempFile(r *http.Request, key string) (*os.File, error) {
 	_, fileHeader, err := r.FormFile(key)
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	return readFileHeaderToTempFile(fileHeader)
 }
 
 // ReadFormFilesToTempFiles reads files array data from a request form and writes it to a temporary files
-func ReadFormFilesToTempFiles(r *http.Request, key string) ([]os.File, error) {
+func ReadFormFilesToTempFiles(r *http.Request, key string) ([]*os.File, error) {
 	if err := r.ParseMultipartForm(32 << 20); err != nil {
 		return nil, err
 	}
 
-	files := make([]os.File, 0, len(r.MultipartForm.File[key]))
+	files := make([]*os.File, 0, len(r.MultipartForm.File[key]))
 
 	for _, fileHeader := range r.MultipartForm.File[key] {
 		file, err := readFileHeaderToTempFile(fileHeader)
@@ -106,29 +106,29 @@ func ReadFormFilesToTempFiles(r *http.Request, key string) ([]os.File, error) {
 }
 
 // readFileHeaderToTempFile reads multipart.FileHeader and writes it to a temporary file
-func readFileHeaderToTempFile(fileHeader *multipart.FileHeader) (os.File, error) {
+func readFileHeaderToTempFile(fileHeader *multipart.FileHeader) (*os.File, error) {
 	formFile, err := fileHeader.Open()
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	defer formFile.Close()
 
 	fileBytes, err := ioutil.ReadAll(formFile)
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	file, err := ioutil.TempFile("", fileHeader.Filename)
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	defer file.Close()
 
 	file.Write(fileBytes)
 
-	return *file, nil
+	return file, nil
 }
 
 // parseInt64Parameter parses a string parameter to an int64.

samples/server/petstore/go-server-required/go/api.go

@@ -68,7 +68,7 @@ type PetApiServicer interface {
 	GetPetById(context.Context, int64) (ImplResponse, error)
 	UpdatePet(context.Context, Pet) (ImplResponse, error)
 	UpdatePetWithForm(context.Context, int64, string, string) (ImplResponse, error)
-	UploadFile(context.Context, int64, string, os.File) (ImplResponse, error)
+	UploadFile(context.Context, int64, string, *os.File) (ImplResponse, error)
 }
 
 

samples/server/petstore/go-server-required/go/api_pet_service.go

@@ -130,7 +130,7 @@ func (s *PetApiService) UpdatePetWithForm(ctx context.Context, petId int64, name
 }
 
 // UploadFile - uploads an image
-func (s *PetApiService) UploadFile(ctx context.Context, petId int64, additionalMetadata string, file os.File) (ImplResponse, error) {
+func (s *PetApiService) UploadFile(ctx context.Context, petId int64, additionalMetadata string, file *os.File) (ImplResponse, error) {
 	// TODO - update UploadFile with the required logic for this service method.
 	// Add api_pet_service.go to the .openapi-generator-ignore to avoid overwriting this service implementation when updating open api generation.
 

samples/server/petstore/go-server-required/go/routers.go

@@ -76,22 +76,22 @@ func EncodeJSONResponse(i interface{}, status *int, headers map[string][]string,
 }
 
 // ReadFormFileToTempFile reads file data from a request form and writes it to a temporary file
-func ReadFormFileToTempFile(r *http.Request, key string) (os.File, error) {
+func ReadFormFileToTempFile(r *http.Request, key string) (*os.File, error) {
 	_, fileHeader, err := r.FormFile(key)
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	return readFileHeaderToTempFile(fileHeader)
 }
 
 // ReadFormFilesToTempFiles reads files array data from a request form and writes it to a temporary files
-func ReadFormFilesToTempFiles(r *http.Request, key string) ([]os.File, error) {
+func ReadFormFilesToTempFiles(r *http.Request, key string) ([]*os.File, error) {
 	if err := r.ParseMultipartForm(32 << 20); err != nil {
 		return nil, err
 	}
 
-	files := make([]os.File, 0, len(r.MultipartForm.File[key]))
+	files := make([]*os.File, 0, len(r.MultipartForm.File[key]))
 
 	for _, fileHeader := range r.MultipartForm.File[key] {
 		file, err := readFileHeaderToTempFile(fileHeader)
@@ -106,29 +106,29 @@ func ReadFormFilesToTempFiles(r *http.Request, key string) ([]os.File, error) {
 }
 
 // readFileHeaderToTempFile reads multipart.FileHeader and writes it to a temporary file
-func readFileHeaderToTempFile(fileHeader *multipart.FileHeader) (os.File, error) {
+func readFileHeaderToTempFile(fileHeader *multipart.FileHeader) (*os.File, error) {
 	formFile, err := fileHeader.Open()
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	defer formFile.Close()
 
 	fileBytes, err := ioutil.ReadAll(formFile)
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	file, err := ioutil.TempFile("", fileHeader.Filename)
 	if err != nil {
-		return os.File{}, err
+		return nil, err
 	}
 
 	defer file.Close()
 
 	file.Write(fileBytes)
 
-	return *file, nil
+	return file, nil
 }
 
 // parseInt64Parameter parses a string parameter to an int64.