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JAX-RS Support for Micronaut

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/*
 * Copyright 2017-2020 original authors
 *
 * 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
 *
 * https://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.
 */
package io.micronaut.jaxrs.runtime.ext.bind;

import io.micronaut.core.convert.ArgumentConversionContext;
import io.micronaut.core.type.Argument;
import io.micronaut.http.HttpRequest;
import io.micronaut.http.bind.binders.TypedRequestArgumentBinder;
import io.micronaut.jaxrs.common.JaxRsHttpHeaders;
import jakarta.inject.Singleton;
import jakarta.ws.rs.core.HttpHeaders;

import java.util.Optional;

/**
 * Handles binding of the JAX-RS {@code HttpHeaders} type.
 *
 * @author graemerocher
 * @since 1.0
 */
@Singleton
public class HttpHeadersBinder implements TypedRequestArgumentBinder {

    public static final Argument TYPE = Argument.of(HttpHeaders.class);
    public static final String HEADERS_KEY = HttpHeaders.class.getName();

    @Override
    public Argument argumentType() {
        return TYPE;
    }

    @Override
    public BindingResult bind(ArgumentConversionContext context, HttpRequest source) {
        Object jaxRxHeaders = source.getAttribute(HEADERS_KEY).orElse(null);
        if (jaxRxHeaders instanceof io.micronaut.http.HttpHeaders httpHeaders) {
            return () -> Optional.of(JaxRsHttpHeaders.forRequest(httpHeaders));
        }
        return () -> Optional.of(JaxRsHttpHeaders.forRequest(source.getHeaders()));
    }
}