TrailersValidationSupport.java

/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
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package org.apache.hc.core5.http2.impl.nio;

import java.util.List;

import org.apache.hc.core5.annotation.Internal;
import org.apache.hc.core5.http.Header;
import org.apache.hc.core5.http.ProtocolException;

@Internal
final class TrailersValidationSupport {

    static void verify(final List<? extends Header> trailers) throws ProtocolException {
        if (trailers == null || trailers.isEmpty()) {
            return;
        }
        for (int i = 0; i < trailers.size(); i++) {
            final String name = trailers.get(i).getName();
            if (name != null && !name.isEmpty() && name.charAt(0) == ':') {
                throw new ProtocolException("Pseudo-header '" + name + "' is not allowed in trailers");
            }
        }
    }

    private TrailersValidationSupport() {
    }

}