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+/*
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+ * Copyright 2002-2018 the original author or authors.
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+ *
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+ * Licensed under the Apache License, Version 2.0 (the "License");
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+ * you may not use this file except in compliance with the License.
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+ * You may obtain a copy of the License at
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+ *
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+ * https://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+package org.springframework.security.oauth2.server.authorization.http.converter;
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+
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+import org.springframework.http.converter.GenericHttpMessageConverter;
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+import org.springframework.http.converter.HttpMessageConverter;
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+import org.springframework.http.converter.json.GsonHttpMessageConverter;
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+import org.springframework.http.converter.json.JsonbHttpMessageConverter;
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+import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
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+import org.springframework.util.ClassUtils;
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+
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+/**
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+ * TODO
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+ * This class is a straight copy from Spring Security.
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+ * It should be consolidated when merging this codebase into Spring Security.
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+ *
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+ * Utility methods for {@link HttpMessageConverter}'s.
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+ *
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+ * @author Joe Grandja
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+ * @since 5.1
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+ */
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+final class HttpMessageConverters {
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+
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+ private static final boolean jackson2Present;
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+
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+ private static final boolean gsonPresent;
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+
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+ private static final boolean jsonbPresent;
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+
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+ static {
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+ ClassLoader classLoader = HttpMessageConverters.class.getClassLoader();
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+ jackson2Present = ClassUtils.isPresent("com.fasterxml.jackson.databind.ObjectMapper", classLoader)
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+ && ClassUtils.isPresent("com.fasterxml.jackson.core.JsonGenerator", classLoader);
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+ gsonPresent = ClassUtils.isPresent("com.google.gson.Gson", classLoader);
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+ jsonbPresent = ClassUtils.isPresent("javax.json.bind.Jsonb", classLoader);
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+ }
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+
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+ private HttpMessageConverters() {
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+ }
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+
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+ static GenericHttpMessageConverter<Object> getJsonMessageConverter() {
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+ if (jackson2Present) {
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+ return new MappingJackson2HttpMessageConverter();
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+ }
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+ if (gsonPresent) {
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+ return new GsonHttpMessageConverter();
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+ }
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+ if (jsonbPresent) {
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+ return new JsonbHttpMessageConverter();
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+ }
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+ return null;
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+ }
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+
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+}
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