Implement useAbstractionForFiles for webclient library (#7567)

* implement useAbstractionForFiles for webclient library

* update doc

Co-authored-by: William Cheng <wing328hk@gmail.com>

Author: iyzana

modules/openapi-generator/src/main/resources/Java/libraries/webclient/api.mustache

@@ -62,7 +62,7 @@ public class {{classname}} {
     * @see <a href="{{url}}">{{summary}} Documentation</a>
 {{/externalDocs}}
      */
-    public {{#returnType}}{{#isArray}}Flux<{{{returnBaseType}}}>{{/isArray}}{{^isArray}}Mono<{{{returnType}}}>{{/isArray}} {{/returnType}}{{^returnType}}Mono<Void> {{/returnType}}{{operationId}}({{#allParams}}{{{dataType}}} {{paramName}}{{^-last}}, {{/-last}}{{/allParams}}) throws WebClientResponseException {
+    public {{#returnType}}{{#isArray}}Flux<{{{returnBaseType}}}>{{/isArray}}{{^isArray}}Mono<{{{returnType}}}>{{/isArray}} {{/returnType}}{{^returnType}}Mono<Void> {{/returnType}}{{operationId}}({{#allParams}}{{#isFile}}{{#useAbstractionForFiles}}{{#collectionFormat}}java.util.Collection<org.springframework.core.io.AbstractResource>{{/collectionFormat}}{{^collectionFormat}}org.springframework.core.io.AbstractResource{{/collectionFormat}}{{/useAbstractionForFiles}}{{^useAbstractionForFiles}}{{{dataType}}}{{/useAbstractionForFiles}}{{/isFile}}{{^isFile}}{{{dataType}}}{{/isFile}} {{paramName}}{{^-last}}, {{/-last}}{{/allParams}}) throws WebClientResponseException {
         Object postBody = {{#bodyParam}}{{paramName}}{{/bodyParam}}{{^bodyParam}}null{{/bodyParam}};
         {{#allParams}}
         {{#required}}
@@ -109,7 +109,7 @@ public class {{classname}} {
 
         {{#formParams}}
         if ({{paramName}} != null)
-            formParams.add{{#collectionFormat}}All{{/collectionFormat}}("{{baseName}}", {{#isFile}}{{^collectionFormat}}new FileSystemResource({{paramName}}){{/collectionFormat}}{{/isFile}}{{#isFile}}{{#collectionFormat}}{{paramName}}.stream().map(FileSystemResource::new).collect(Collectors.toList()){{/collectionFormat}}{{/isFile}}{{^isFile}}{{paramName}}{{/isFile}});
+            formParams.add{{#collectionFormat}}All{{/collectionFormat}}("{{baseName}}", {{#isFile}}{{^collectionFormat}}{{#useAbstractionForFiles}}{{paramName}}{{/useAbstractionForFiles}}{{^useAbstractionForFiles}}new FileSystemResource({{paramName}}){{/useAbstractionForFiles}}{{/collectionFormat}}{{/isFile}}{{#isFile}}{{#collectionFormat}}{{paramName}}.stream(){{^useAbstractionForFiles}}.map(FileSystemResource::new){{/useAbstractionForFiles}}.collect(Collectors.toList()){{/collectionFormat}}{{/isFile}}{{^isFile}}{{paramName}}{{/isFile}});
         {{/formParams}}
         {{/hasFormParams}}
 

modules/openapi-generator/src/main/resources/Java/libraries/webclient/api_test.mustache

@@ -31,7 +31,7 @@ public class {{classname}}Test {
     @Test
     public void {{operationId}}Test()  {
         {{#allParams}}
-        {{{dataType}}} {{paramName}} = null;
+        {{#isFile}}{{#useAbstractionForFiles}}{{#collectionFormat}}java.util.Collection<org.springframework.core.io.AbstractResource>{{/collectionFormat}}{{^collectionFormat}}org.springframework.core.io.AbstractResource{{/collectionFormat}}{{/useAbstractionForFiles}}{{^useAbstractionForFiles}}{{{dataType}}}{{/useAbstractionForFiles}}{{/isFile}}{{^isFile}}{{{dataType}}}{{/isFile}} {{paramName}} = null;
         {{/allParams}}
         {{#returnType}}{{{returnType}}} response = {{/returnType}}api.{{operationId}}({{#allParams}}{{paramName}}{{^-last}}, {{/-last}}{{/allParams}}){{#isArray}}.collectList().block(){{/isArray}}{{^isArray}}.block(){{/isArray}};
 

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

@@ -1088,4 +1088,48 @@ public void testCustomMethodParamsAreCamelizedWhenUsingFeign() throws IOExceptio
 
         output.deleteOnExit();
     }
+
+    /**
+     * See https://github.com/OpenAPITools/openapi-generator/issues/6715
+     */
+    @Test
+    public void testWebClientWithUseAbstractionForFiles() throws IOException {
+
+        Map<String, Object> properties = new HashMap<>();
+        properties.put(JavaClientCodegen.JAVA8_MODE, true);
+        properties.put(CodegenConstants.API_PACKAGE, "xyz.abcdef.api");
+        properties.put(JavaClientCodegen.USE_ABSTRACTION_FOR_FILES, true);
+
+
+        File output = Files.createTempDirectory("test").toFile();
+        output.deleteOnExit();
+
+        final CodegenConfigurator configurator = new CodegenConfigurator()
+                .setGeneratorName("java")
+                .setLibrary(JavaClientCodegen.WEBCLIENT)
+                .setAdditionalProperties(properties)
+                .setInputSpec("src/test/resources/3_0/form-multipart-binary-array.yaml")
+                .setOutputDir(output.getAbsolutePath().replace("\\", "/"));
+
+
+        DefaultGenerator generator = new DefaultGenerator();
+        List<File> files = generator.opts(configurator.toClientOptInput()).generate();
+        files.forEach(File::deleteOnExit);
+
+
+        Path defaultApi = Paths.get(output + "/src/main/java/xyz/abcdef/api/MultipartApi.java");
+        TestUtils.assertFileContains(defaultApi,
+                //multiple files
+                "multipartArray(java.util.Collection<org.springframework.core.io.AbstractResource> files)",
+                "formParams.addAll(\"files\", files.stream().collect(Collectors.toList()));",
+
+                //mixed
+                "multipartMixed(org.springframework.core.io.AbstractResource file, MultipartMixedMarker marker)",
+                "formParams.add(\"file\", file);",
+
+                //single file
+                "multipartSingle(org.springframework.core.io.AbstractResource file)",
+                "formParams.add(\"file\", file);"
+        );
+    }
 }