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/*
 * Copyright 2020 the original author or 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 org.springframework.security.oauth2.server.authorization.web;

import org.springframework.lang.Nullable;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.authentication.AuthenticationConverter;
import org.springframework.util.Assert;

import javax.servlet.http.HttpServletRequest;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Objects;

/**
 * An {@link AuthenticationConverter} that simply delegates to it's
 * internal {@code List} of {@link AuthenticationConverter}(s).
 * 
 * Each {@link AuthenticationConverter} is given a chance to
 * {@link AuthenticationConverter#convert(HttpServletRequest)}
 * with the first {@code non-null} {@link Authentication} being returned.
 *
 * @author Joe Grandja
 * @since 0.0.2
 * @see AuthenticationConverter
 */
public final class DelegatingAuthenticationConverter implements AuthenticationConverter {
	private final List converters;

	/**
	 * Constructs a {@code DelegatingAuthenticationConverter} using the provided parameters.
	 *
	 * @param converters a {@code List} of {@link AuthenticationConverter}(s)
	 */
	public DelegatingAuthenticationConverter(List converters) {
		Assert.notEmpty(converters, "converters cannot be empty");
		this.converters = Collections.unmodifiableList(new LinkedList<>(converters));
	}

	@Nullable
	@Override
	public Authentication convert(HttpServletRequest request) {
		Assert.notNull(request, "request cannot be null");
		// @formatter:off
		return this.converters.stream()
				.map(converter -> converter.convert(request))
				.filter(Objects::nonNull)
				.findFirst()
				.orElse(null);
		// @formatter:on
	}
}