Migrate policy api startup & config, controller to springboot

[policy/api.git] / main / src / main / java / org / onap / policy / api / main / config / WebConfig.java

diff --git a/main/src/main/java/org/onap/policy/api/main/config/WebConfig.java b/main/src/main/java/org/onap/policy/api/main/config/WebConfig.java
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+++ b/main/src/main/java/org/onap/policy/api/main/config/WebConfig.java
@@ -0,0 +1,72 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Bell Canada. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ *      http://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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.api.main.config;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonParser;
+import com.google.gson.JsonSerializer;
+import java.util.Arrays;
+import java.util.List;
+import org.onap.policy.api.main.config.converter.StringToEnumConverter;
+import org.onap.policy.api.main.config.converter.YamlHttpMessageConverter;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.format.FormatterRegistry;
+import org.springframework.http.MediaType;
+import org.springframework.http.converter.HttpMessageConverter;
+import org.springframework.http.converter.json.GsonHttpMessageConverter;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+import springfox.documentation.spring.web.json.Json;
+
+/**
+ * Register custom converters to Spring configuration.
+ */
+@Configuration
+public class WebConfig implements WebMvcConfigurer {
+    @Override
+    public void addFormatters(FormatterRegistry registry) {
+        registry.addConverter(new StringToEnumConverter());
+    }
+
+    @Override
+    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
+        YamlHttpMessageConverter yamlConverter = new YamlHttpMessageConverter();
+        yamlConverter.setSupportedMediaTypes(Arrays.asList(MediaType.parseMediaType("application/yaml")));
+        converters.add(yamlConverter);
+
+        GsonHttpMessageConverter converter = buildGsonConverter();
+        converters.removeIf(c -> c instanceof GsonHttpMessageConverter);
+        converters.add(0, converter);
+    }
+
+    /**
+     * Swagger uses {{@link springfox.documentation.spring.web.json.Json}} which leads to Gson serialization errors.
+     * Hence, we customize a typeAdapter on the Gson bean in the Gson http message converter.
+     *
+     * @return customised GSON HttpMessageConverter instance.
+     */
+    private GsonHttpMessageConverter buildGsonConverter() {
+        JsonSerializer<Json> serializer = (json, type, jsonSerializationContext) ->
+            JsonParser.parseString(json.value());
+        Gson gson = new GsonBuilder().registerTypeAdapter(Json.class, serializer).create();
+        return new GsonHttpMessageConverter(gson);
+    }
+}
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