add post processing to nodejs express server (OpenAPITools#5369)

Author: wing328

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

@@ -887,8 +887,8 @@ public CodegenModel fromModel(String name, Schema model) {
                 String itemType = getSchemaType(ModelUtils.getAdditionalProperties(model));
                 codegenModel.vendorExtensions.put("x-isMap", true); // TODO: 5.0 Remove
                 codegenModel.vendorExtensions.put("x-is-map", true);
-                codegenModel.vendorExtensions.put("x-itemType",itemType); // TODO: 5.0 Remove
-                codegenModel.vendorExtensions.put("x-item-type",itemType);
+                codegenModel.vendorExtensions.put("x-itemType", itemType); // TODO: 5.0 Remove
+                codegenModel.vendorExtensions.put("x-item-type", itemType);
             } else {
                 String type = model.getType();
                 if (codegenModel != null && isPrimitiveType(type)) {

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

@@ -25,6 +25,8 @@
 import io.swagger.v3.oas.models.PathItem.HttpMethod;
 import io.swagger.v3.oas.models.Paths;
 import io.swagger.v3.oas.models.info.Info;
+import org.apache.commons.io.FilenameUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.meta.GeneratorMetadata;
 import org.openapitools.codegen.meta.Stability;
@@ -38,7 +40,7 @@
 import java.util.*;
 import java.util.Map.Entry;
 
-import static org.openapitools.codegen.utils.StringUtils.*;
+import static org.openapitools.codegen.utils.StringUtils.camelize;
 
 public class NodeJSExpressServerCodegen extends DefaultCodegen implements CodegenConfig {
 
@@ -76,8 +78,8 @@ public NodeJSExpressServerCodegen() {
                 .build();
 
         generatorMetadata = GeneratorMetadata.newBuilder(generatorMetadata)
-            .stability(Stability.BETA)
-            .build();
+                .stability(Stability.BETA)
+                .build();
 
         outputFolder = "generated-code/nodejs-express-server";
         embeddedTemplateDir = templateDir = "nodejs-express-server";
@@ -303,6 +305,11 @@ private static List<Map<String, Object>> sortOperationsByPath(List<CodegenOperat
     public void processOpts() {
         super.processOpts();
 
+        if (StringUtils.isEmpty(System.getenv("JS_POST_PROCESS_FILE"))) {
+            LOGGER.info("Environment variable JS_POST_PROCESS_FILE not defined so the JS code may not be properly formatted. To define it, try 'export JS_POST_PROCESS_FILE=\"/usr/local/bin/js-beautify -r -f\"' (Linux/Mac)");
+            LOGGER.info("NOTE: To enable file post-processing, 'enablePostProcessFile' must be set to `true` (--enable-post-process-file for CLI).");
+        }
+
         if (additionalProperties.containsKey(EXPORTED_NAME)) {
             setExportedName((String) additionalProperties.get(EXPORTED_NAME));
         }
@@ -321,8 +328,8 @@ public void processOpts() {
     @Override
     public void preprocessOpenAPI(OpenAPI openAPI) {
         URL url = URLPathUtils.getServerURL(openAPI, serverVariableOverrides());
-        String host =  URLPathUtils.getProtocolAndHost(url);
-        String port = URLPathUtils.getPort(url, defaultServerPort) ;
+        String host = URLPathUtils.getProtocolAndHost(url);
+        String port = URLPathUtils.getPort(url, defaultServerPort);
         String basePath = url.getPath();
 
         if (additionalProperties.containsKey(SERVER_PORT)) {
@@ -407,4 +414,32 @@ public String escapeQuotationMark(String input) {
         // remove " to avoid code injection
         return input.replace("\"", "");
     }
+
+    @Override
+    public void postProcessFile(File file, String fileType) {
+        if (file == null) {
+            return;
+        }
+
+        String jsPostProcessFile = System.getenv("JS_POST_PROCESS_FILE");
+        if (StringUtils.isEmpty(jsPostProcessFile)) {
+            return; // skip if JS_POST_PROCESS_FILE env variable is not defined
+        }
+
+        // only process files with js extension
+        if ("js".equals(FilenameUtils.getExtension(file.toString()))) {
+            String command = jsPostProcessFile + " " + file.toString();
+            try {
+                Process p = Runtime.getRuntime().exec(command);
+                p.waitFor();
+                int exitValue = p.exitValue();
+                if (exitValue != 0) {
+                    LOGGER.error("Error running the command ({}). Exit code: {}", command, exitValue);
+                }
+                LOGGER.info("Successfully executed: " + command);
+            } catch (Exception e) {
+                LOGGER.error("Error running the command ({}). Exception: {}", command, e.getMessage());
+            }
+        }
+    }
 }