[Go] Add multiple file upload support (#16956)

* add go echo api client github workflow

* add support for multi file upload in go client

* update go samples

.github/workflows/samples-go-client-echo-api.yaml

@@ -0,0 +1,32 @@
+name: Go Client (Echo API)
+
+on:
+  pull_request:
+    paths:
+      - samples/client/echo_api/go/**
+      - .github/workflows/samples-go-client-echo-api.yaml
+jobs:
+  build:
+    name: Test Go client
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        sample:
+          # clients
+          - samples/client/echo_api/go
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v4
+        with:
+          go-version: "stable"
+      - name: Setup node.js
+        uses: actions/setup-node@v4
+      - name: Run echo server
+        run: |
+          git clone https://github.com/wing328/http-echo-server -b openapi-generator-test-server
+          (cd http-echo-server && npm install && npm start &)
+      - run: go version
+      - name: Run test
+        working-directory: ${{ matrix.sample }}
+        run: go test -mod=mod -v

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

@@ -255,13 +255,32 @@ func (a *{{{classname}}}Service) {{nickname}}Execute(r {{#structPrefix}}{{&class
 {{/headerParams}}
 {{#formParams}}
 {{#isFile}}
+{{#isArray}}
 	var {{paramName}}LocalVarFormFileName string
 	var {{paramName}}LocalVarFileName     string
 	var {{paramName}}LocalVarFileBytes    []byte
 
-	{{paramName}}LocalVarFormFileName = "{{baseName}}"
+	{{paramName}}LocalVarFormFileName = "{{{baseName}}}"
+	{{paramName}}LocalVarFile := r.{{paramName}}
 
+	if {{paramName}}LocalVarFile != nil {
+		// loop through the array to prepare multiple files upload
+		for _, {{paramName}}LocalVarFileValue := range {{paramName}}LocalVarFile {
+			fbs, _ := io.ReadAll({{paramName}}LocalVarFileValue)
 
+			{{paramName}}LocalVarFileBytes = fbs
+			{{paramName}}LocalVarFileName = {{paramName}}LocalVarFileValue.Name()
+			{{paramName}}LocalVarFileValue.Close()
+			formFiles = append(formFiles, formFile{fileBytes: {{paramName}}LocalVarFileBytes, fileName: {{paramName}}LocalVarFileName, formFileName: {{paramName}}LocalVarFormFileName})
+		}
+	}
+{{/isArray}}
+{{^isArray}}
+	var {{paramName}}LocalVarFormFileName string
+	var {{paramName}}LocalVarFileName     string
+	var {{paramName}}LocalVarFileBytes    []byte
+
+	{{paramName}}LocalVarFormFileName = "{{{baseName}}}"
 	{{paramName}}LocalVarFile := r.{{paramName}}
 
 	if {{paramName}}LocalVarFile != nil {
@@ -272,6 +291,7 @@ func (a *{{{classname}}}Service) {{nickname}}Execute(r {{#structPrefix}}{{&class
 		{{paramName}}LocalVarFile.Close()
 		formFiles = append(formFiles, formFile{fileBytes: {{paramName}}LocalVarFileBytes, fileName: {{paramName}}LocalVarFileName, formFileName: {{paramName}}LocalVarFormFileName})
 	}
+{{/isArray}}
 {{/isFile}}
 {{^isFile}}
 {{#required}}

samples/client/echo_api/go/api_body.go

@@ -306,17 +306,18 @@ func (a *BodyAPIService) TestBodyMultipartFormdataArrayOfBinaryExecute(r ApiTest
 	var filesLocalVarFileBytes    []byte
 
 	filesLocalVarFormFileName = "files"
-
-
 	filesLocalVarFile := r.files
 
 	if filesLocalVarFile != nil {
-		fbs, _ := io.ReadAll(filesLocalVarFile)
+		// loop through the array to prepare multiple files upload
+		for _, filesLocalVarFileValue := range filesLocalVarFile {
+			fbs, _ := io.ReadAll(filesLocalVarFileValue)
 
-		filesLocalVarFileBytes = fbs
+			filesLocalVarFileBytes = fbs
-		filesLocalVarFileName = filesLocalVarFile.Name()
+			filesLocalVarFileName = filesLocalVarFileValue.Name()
-		filesLocalVarFile.Close()
+			filesLocalVarFileValue.Close()
-		formFiles = append(formFiles, formFile{fileBytes: filesLocalVarFileBytes, fileName: filesLocalVarFileName, formFileName: filesLocalVarFormFileName})
+			formFiles = append(formFiles, formFile{fileBytes: filesLocalVarFileBytes, fileName: filesLocalVarFileName, formFileName: filesLocalVarFormFileName})
+		}
 	}
 	req, err := a.client.prepareRequest(r.ctx, localVarPath, localVarHTTPMethod, localVarPostBody, localVarHeaderParams, localVarQueryParams, localVarFormParams, formFiles)
 	if err != nil {

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

@@ -1270,8 +1270,6 @@ func (a *FakeAPIService) TestEndpointParametersExecute(r ApiTestEndpointParamete
 	var binaryLocalVarFileBytes    []byte
 
 	binaryLocalVarFormFileName = "binary"
-
-
 	binaryLocalVarFile := r.binary
 
 	if binaryLocalVarFile != nil {

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

@@ -976,8 +976,6 @@ func (a *PetAPIService) UploadFileExecute(r ApiUploadFileRequest) (*ApiResponse,
 	var fileLocalVarFileBytes    []byte
 
 	fileLocalVarFormFileName = "file"
-
-
 	fileLocalVarFile := r.file
 
 	if fileLocalVarFile != nil {
@@ -1114,8 +1112,6 @@ func (a *PetAPIService) UploadFileWithRequiredFileExecute(r ApiUploadFileWithReq
 	var requiredFileLocalVarFileBytes    []byte
 
 	requiredFileLocalVarFormFileName = "requiredFile"
-
-
 	requiredFileLocalVarFile := r.requiredFile
 
 	if requiredFileLocalVarFile != nil {

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

@@ -1451,8 +1451,6 @@ func (a *FakeAPIService) TestEndpointParametersExecute(r ApiTestEndpointParamete
 	var binaryLocalVarFileBytes    []byte
 
 	binaryLocalVarFormFileName = "binary"
-
-
 	binaryLocalVarFile := r.binary
 
 	if binaryLocalVarFile != nil {

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

@@ -999,8 +999,6 @@ func (a *PetAPIService) UploadFileExecute(r ApiUploadFileRequest) (*ApiResponse,
 	var fileLocalVarFileBytes    []byte
 
 	fileLocalVarFormFileName = "file"
-
-
 	fileLocalVarFile := r.file
 
 	if fileLocalVarFile != nil {
@@ -1139,8 +1137,6 @@ func (a *PetAPIService) UploadFileWithRequiredFileExecute(r ApiUploadFileWithReq
 	var requiredFileLocalVarFileBytes    []byte
 
 	requiredFileLocalVarFormFileName = "requiredFile"
-
-
 	requiredFileLocalVarFile := r.requiredFile
 
 	if requiredFileLocalVarFile != nil {