Remove servers urls with trailing slash (#7940)

* remove trailing slash

* update sample app

* added tests

* bug fix

* Adds test in DefaultGeneratorTest

* Reverts python files

* Does not modify a value of /

* Stops skipping / use case

* update samples

Co-authored-by: Justin Black <justin.a.black@gmail.com>
Co-authored-by: William Cheng <wing328hk@gmail.com>

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

@@ -266,9 +266,9 @@ public class DefaultGenerator implements Generator {
         // TODO: Allow user to define _which_ servers object in the array to target.
         // Configures contextPath/basePath according to api document's servers
         URL url = URLPathUtils.getServerURL(openAPI, config.serverVariableOverrides());
-        contextPath = config.escapeText(url.getPath()).replaceAll("/$", ""); // for backward compatibility
+        contextPath = removeTrailingSlash(config.escapeText(url.getPath())); // for backward compatibility
         basePathWithoutHost = contextPath;
-        basePath = config.escapeText(URLPathUtils.getHost(openAPI, config.serverVariableOverrides())).replaceAll("/$", "");
+        basePath = removeTrailingSlash(config.escapeText(URLPathUtils.getHost(openAPI, config.serverVariableOverrides())));
     }
 
     private void configureOpenAPIInfo() {
@@ -552,7 +552,7 @@ public class DefaultGenerator implements Generator {
     }
 
     @SuppressWarnings("unchecked")
-    private void generateApis(List<File> files, List<Object> allOperations, List<Object> allModels) {
+    void generateApis(List<File> files, List<Object> allOperations, List<Object> allModels) {
         if (!generateApis) {
             // TODO: Process these anyway and present info via dryRun?
             LOGGER.info("Skipping generation of APIs.");
@@ -580,7 +580,7 @@ public class DefaultGenerator implements Generator {
                 Map<String, Object> operation = processOperations(config, tag, ops, allModels);
                 URL url = URLPathUtils.getServerURL(openAPI, config.serverVariableOverrides());
                 operation.put("basePath", basePath);
-                operation.put("basePathWithoutHost", config.encodePath(url.getPath()).replaceAll("/$", ""));
+                operation.put("basePathWithoutHost", removeTrailingSlash(config.encodePath(url.getPath())));
                 operation.put("contextPath", contextPath);
                 operation.put("baseName", tag);
                 operation.put("apiPackage", config.apiPackage());
@@ -756,7 +756,7 @@ public class DefaultGenerator implements Generator {
     }
 
     @SuppressWarnings("unchecked")
-    private Map<String, Object> buildSupportFileBundle(List<Object> allOperations, List<Object> allModels) {
+    Map<String, Object> buildSupportFileBundle(List<Object> allOperations, List<Object> allModels) {
 
         Map<String, Object> bundle = new HashMap<>(config.additionalProperties());
         bundle.put("apiPackage", config.apiPackage());
@@ -806,6 +806,7 @@ public class DefaultGenerator implements Generator {
 
         List<CodegenServer> servers = config.fromServers(openAPI.getServers());
         if (servers != null && !servers.isEmpty()) {
+            servers.forEach(server -> server.url = removeTrailingSlash(server.url));
             bundle.put("servers", servers);
             bundle.put("hasServers", true);
         }
@@ -1483,4 +1484,8 @@ public class DefaultGenerator implements Generator {
         }
     }
 
+    private String removeTrailingSlash(String value) {
+        return StringUtils.removeEnd(value, "/");
+    }
+
 }

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

@@ -11,8 +11,11 @@ import io.swagger.v3.oas.models.parameters.QueryParameter;
 import io.swagger.v3.oas.models.parameters.RequestBody;
 import io.swagger.v3.oas.models.responses.ApiResponse;
 import io.swagger.v3.oas.models.responses.ApiResponses;
+import org.apache.commons.lang3.StringUtils;
 import org.openapitools.codegen.config.CodegenConfigurator;
 import org.openapitools.codegen.config.GlobalSettings;
+import org.openapitools.codegen.meta.GeneratorMetadata;
+import org.openapitools.codegen.meta.Stability;
 import org.openapitools.codegen.utils.ModelUtils;
 import org.testng.Assert;
 import org.testng.annotations.Test;
@@ -636,5 +639,31 @@ public class DefaultGeneratorTest {
             templates.toFile().delete();
         }
     }
+
+    @Test
+    public void testHandlesTrailingSlashInServers() {
+        OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/issue_7533.yaml");
+        ClientOptInput opts = new ClientOptInput();
+        opts.openAPI(openAPI);
+        DefaultCodegen config = new DefaultCodegen();
+        config.setStrictSpecBehavior(false);
+        opts.config(config);
+        final DefaultGenerator generator = new DefaultGenerator();
+        generator.opts(opts);
+        generator.configureGeneratorProperties();
+
+        List<File> files = new ArrayList<>();
+        List<String> filteredSchemas = ModelUtils.getSchemasUsedOnlyInFormParam(openAPI);
+        List<Object> allModels = new ArrayList<>();
+        generator.generateModels(files, allModels, filteredSchemas);
+        List<Object> allOperations = new ArrayList<>();
+        generator.generateApis(files, allOperations, allModels);
+
+        Map<String, Object> bundle = generator.buildSupportFileBundle(allOperations, allModels);
+        LinkedList<CodegenServer> servers = (LinkedList<CodegenServer>) bundle.get("servers");
+        Assert.assertEquals(servers.get(0).url, "");
+        Assert.assertEquals(servers.get(1).url, "http://trailingshlash.io:80/v1");
+        Assert.assertEquals(servers.get(2).url, "http://notrailingslash.io:80/v2");
+    }
 }
 

modules/openapi-generator/src/test/resources/3_0/issue_7533.yaml

@@ -0,0 +1,17 @@
+openapi: 3.0.1
+info:
+  title: OpenAPI Petstore
+  description: "sample spec"
+  license:
+    name: Apache-2.0
+    url: https://www.apache.org/licenses/LICENSE-2.0.html
+  version: 1.0.0
+servers:
+  - url: /
+  - url: http://trailingshlash.io:80/v1/
+  - url: http://notrailingslash.io:80/v2
+tags: []
+paths: {}
+components:
+  schemas: {}
+  securitySchemes: {}

samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/ApiClient.java

@@ -72,7 +72,7 @@ public class ApiClient extends JavaTimeFormatter {
 
   protected List<ServerConfiguration> servers = new ArrayList<ServerConfiguration>(Arrays.asList(
     new ServerConfiguration(
-      "/",
+      "",
       "No description provided",
       new HashMap<String, ServerVariable>()
     )