HeaderOnlyForMultipartCsrfTokenRequestHandler.java

/*
 * Copyright (c) 2007-2026 MetaSolutions AB
 *
 * 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.
 */

package org.entrystore.rest.springboot.security;

import jakarta.servlet.http.HttpServletRequest;
import org.entrystore.rest.springboot.util.HttpUtil;
import org.springframework.security.web.csrf.CsrfToken;
import org.springframework.security.web.csrf.CsrfTokenRequestAttributeHandler;

/**
 * Reads the CSRF token of a multipart request from the header only. The parameter fallback of
 * {@link CsrfTokenRequestAttributeHandler} would make Jetty parse the whole upload to temporary files before the
 * token, or any access check, is evaluated.
 */
class HeaderOnlyForMultipartCsrfTokenRequestHandler extends CsrfTokenRequestAttributeHandler {

	@Override
	public String resolveCsrfTokenValue(HttpServletRequest request, CsrfToken csrfToken) {
		if (HttpUtil.isMultipart(request)) {
			return request.getHeader(csrfToken.getHeaderName());
		}
		return super.resolveCsrfTokenValue(request, csrfToken);
	}
}