Remove DelegatingAuthenticationConverter

Closes gh-2102

oauth2-authorization-server/src/main/java/org/springframework/security/oauth2/server/authorization/web/authentication/DelegatingAuthenticationConverter.java

@@ -1,71 +0,0 @@
-/*
- * Copyright 2020-2024 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.authentication;
-
-import java.util.Collections;
-import java.util.LinkedList;
-import java.util.List;
-
-import jakarta.servlet.http.HttpServletRequest;
-
-import org.springframework.lang.Nullable;
-import org.springframework.security.core.Authentication;
-import org.springframework.security.web.authentication.AuthenticationConverter;
-import org.springframework.util.Assert;
-
-/**
- * An {@link AuthenticationConverter} that simply delegates to it's internal {@code List}
- * of {@link AuthenticationConverter}(s).
- * <p>
- * 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
- * @deprecated For removal in 2.0. Use
- * {@link org.springframework.security.web.authentication.DelegatingAuthenticationConverter}
- */
-@Deprecated(since = "1.4", forRemoval = true)
-public final class DelegatingAuthenticationConverter implements AuthenticationConverter {
-
-	private final List<AuthenticationConverter> converters;
-
-	/**
-	 * Constructs a {@code DelegatingAuthenticationConverter} using the provided
-	 * parameters.
-	 * @param converters a {@code List} of {@link AuthenticationConverter}(s)
-	 */
-	public DelegatingAuthenticationConverter(List<AuthenticationConverter> 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");
-		for (AuthenticationConverter converter : this.converters) {
-			Authentication authentication = converter.convert(request);
-			if (authentication != null) {
-				return authentication;
-			}
-		}
-		return null;
-	}
-
-}