[GO] Add go.mod in go-gin-server generator (#15339)

* Add go.mod

* Add test

* Generate import path

* Update samples

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

@@ -191,6 +191,7 @@ public class GoGinServerCodegen extends AbstractGoCodegen {
         supportingFiles.add(new SupportingFile("routers.mustache", apiPath, "routers.go"));
         supportingFiles.add(new SupportingFile("README.mustache", apiPath, "README.md")
                 .doNotOverwrite());
+        supportingFiles.add(new SupportingFile("go.mod.mustache", "go.mod"));
     }
 
     @Override

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

@@ -0,0 +1,6 @@
+module {{gitHost}}/{{gitUserId}}/{{gitRepoId}}{{#isGoSubmodule}}/{{packageName}}{{/isGoSubmodule}}
+
+go 1.19
+
+require github.com/gin-gonic/gin v1.9.0
+

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

@@ -5,13 +5,9 @@ import (
 	"log"
 
 	// WARNING!
-	// Change this to a fully-qualified import path
-	// once you place this file into your project.
-	// For example,
+	// Pass --git-repo-id and --git-user-id properties when generating the code
 	//
-	//sw "github.com/{{{gitUserId}}}/{{{gitRepoId}}}/{{{apiPath}}}"
-	//
-	sw "./{{apiPath}}"
+	sw "{{gitHost}}/{{gitUserId}}/{{gitRepoId}}{{#isGoSubmodule}}/{{packageName}}{{/isGoSubmodule}}/{{apiPath}}"
 )
 
 func main() {

modules/openapi-generator/src/test/java/org/openapitools/codegen/goginserver/GoGinServerCodegenTest.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2018 OpenAPI-Generator Contributors (https://openapi-generator.tech)
+ * Copyright 2018 SmartBear Software
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.openapitools.codegen.goginserver;
+
+import org.openapitools.codegen.*;
+import org.openapitools.codegen.config.CodegenConfigurator;
+import org.openapitools.codegen.languages.GoClientCodegen;
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+
+public class GoGinServerCodegenTest {
+
+    @Test
+    public void verifyGoMod() throws IOException {
+        File output = Files.createTempDirectory("test").toFile();
+        output.deleteOnExit();
+
+        final CodegenConfigurator configurator = new CodegenConfigurator()
+                .setGeneratorName("go-gin-server")
+                .setGitUserId("my-user")
+                .setGitRepoId("my-repo")
+                .setPackageName("my-package")
+                .setInputSpec("src/test/resources/3_0/petstore.yaml")
+                .setOutputDir(output.getAbsolutePath().replace("\\", "/"));
+
+        DefaultGenerator generator = new DefaultGenerator();
+        List<File> files = generator.opts(configurator.toClientOptInput()).generate();
+        files.forEach(File::deleteOnExit);
+
+        TestUtils.assertFileExists(Paths.get(output + "/go.mod"));
+        TestUtils.assertFileContains(Paths.get(output + "/go.mod"),
+                "module github.com/my-user/my-repo");
+        TestUtils.assertFileContains(Paths.get(output + "/go.mod"),
+                "require github.com/gin-gonic/gin v1.9.0");
+    }
+
+}

samples/server/petstore/go-gin-api-server/.openapi-generator/FILES

@@ -1,5 +1,6 @@
 Dockerfile
 api/openapi.yaml
+go.mod
 go/README.md
 go/api_pet.go
 go/api_store.go

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

@@ -0,0 +1,6 @@
+module github.com/GIT_USER_ID/GIT_REPO_ID
+
+go 1.19
+
+require github.com/gin-gonic/gin v1.9.0
+

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

@@ -13,13 +13,9 @@ import (
 	"log"
 
 	// WARNING!
-	// Change this to a fully-qualified import path
-	// once you place this file into your project.
-	// For example,
+	// Pass --git-repo-id and --git-user-id properties when generating the code
 	//
-	//sw "github.com/GIT_USER_ID/GIT_REPO_ID/go"
-	//
-	sw "./go"
+	sw "github.com/GIT_USER_ID/GIT_REPO_ID/go"
 )
 
 func main() {