[Java RESTEasy client] added filename directive for Java RESTEasy file uploads (#17367) (#17435)

* added filename directive for Java RESTEasy file uploads (#17367)

* regenerated samples

Author: miladhub

bin/configs/java-resteasy-echo.yaml

@@ -0,0 +1,8 @@
+generatorName: java
+outputDir: samples/client/petstore/java/resteasy-echo
+inputSpec: modules/openapi-generator/src/test/resources/3_0/petstore-echo.yaml
+templateDir: modules/openapi-generator/src/main/resources/Java
+additionalProperties:
+  artifactId: petstore-resteasy-echo
+  hideGenerationTimestamp: "true"
+  library: resteasy

modules/openapi-generator/src/main/resources/Java/libraries/resteasy/ApiClient.mustache

@@ -498,7 +498,7 @@ public class ApiClient{{#jsr310}} extends JavaTimeFormatter{{/jsr310}} {
         if (param.getValue() instanceof File) {
           File file = (File) param.getValue();
           try {
-            multipart.addFormData(param.getKey(),new FileInputStream(file),MediaType.APPLICATION_OCTET_STREAM_TYPE);
+            multipart.addFormData(param.getKey(),new FileInputStream(file),MediaType.APPLICATION_OCTET_STREAM_TYPE, file.getName());
           } catch (FileNotFoundException e) {
             throw new ApiException("Could not serialize multipart/form-data "+e.getMessage());
           }

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

@@ -64,7 +64,9 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
+import junit.framework.AssertionFailedError;
 import lombok.SneakyThrows;
 import org.openapitools.codegen.ClientOptInput;
 import org.openapitools.codegen.CodegenConstants;
@@ -764,6 +766,50 @@ public void testAuthorizationScopeValues_Issue6733() throws IOException {
         files.forEach(File::deleteOnExit);
     }
 
+    @Test
+    public void testMultiPartSpecifiesFileName_Issue17367() throws IOException {
+        File output = Files.createTempDirectory("test").toFile();
+        output.deleteOnExit();
+
+        final CodegenConfigurator configurator = new CodegenConfigurator()
+                .setGeneratorName("java")
+                .setLibrary(JavaClientCodegen.RESTEASY)
+                .setValidateSpec(false)
+                .setInputSpec("src/test/resources/3_0/issue-17367.yaml")
+                .setOutputDir(output.getAbsolutePath().replace("\\", "/"));
+
+        final ClientOptInput clientOptInput = configurator.toClientOptInput();
+
+        DefaultGenerator generator = new DefaultGenerator();
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODELS, "true");
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_TESTS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_DOCS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.APIS, "true");
+        generator.setGeneratorPropertyDefault(CodegenConstants.SUPPORTING_FILES, "true");
+        generator.setGenerateMetadata(false);
+        List<File> files = generator.opts(clientOptInput).generate();
+        try {
+            validateJavaSourceFiles(files);
+            File apiClient = files.stream()
+                    .filter(f -> f.getName().equals("ApiClient.java"))
+                    .findFirst()
+                    .orElseThrow(() -> new AssertionFailedError(
+                            "ApiClient.java not found"));
+
+            Stream<String> contents = Arrays.stream(Files.readString(apiClient.toPath(),
+                    StandardCharsets.UTF_8).split("\n"));
+
+            // https://docs.jboss.org/resteasy/docs/6.2.5.Final/javadocs/org/jboss/resteasy/plugins/providers/multipart/MultipartFormDataOutput.html#addFormData(java.lang.String,java.lang.Object,jakarta.ws.rs.core.MediaType,java.lang.String)
+            assertTrue(contents.anyMatch(l -> l.matches(
+                    ".*multipart\\.addFormData\\(param.getKey\\(\\),\\s*" +
+                    "new\\s+FileInputStream\\(file\\),\\s*" +
+                    "MediaType\\.APPLICATION_OCTET_STREAM_TYPE,\\s*" +
+                    "file.getName\\(\\)\\);.*")));
+        } finally {
+            files.forEach(File::deleteOnExit);
+        }
+    }
+
     @Test
     public void testAuthorizationsMethodsSizeWhenFiltered() {
         final OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/issue4584.yaml");

modules/openapi-generator/src/test/resources/3_0/issue-17367.yaml

@@ -0,0 +1,24 @@
+openapi: 3.0.0
+info:
+  version: 1.0.0
+  title: Foo API
+servers:
+  - url: http://127.0.0.1:8080/{basePath}
+    variables:
+      basePath:
+        default: v1
+paths:
+  /foo:
+    post:
+      requestBody:
+        content:
+          multipart/form-data:
+            schema:
+              type: object
+              properties:
+                bar:
+                  type: string
+                  format: binary
+      responses:
+        '200':
+          description: OK