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Stapler HTTP request handling engine
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/*
 * Copyright (c) 2004-2010, Kohsuke Kawaguchi
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided
 * that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright notice, this list of
 *       conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.kohsuke.stapler;

import org.kohsuke.stapler.Header.HandlerImpl;

import javax.servlet.ServletException;

import static java.lang.annotation.ElementType.PARAMETER;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Target;
import java.lang.annotation.Documented;

/**
 * Indicates that this parameter is bound from HTTP header.
 *
 * @author Kohsuke Kawaguchi
 */
@Retention(RUNTIME)
@Target(PARAMETER)
@Documented
@InjectedParameter(HandlerImpl.class)
public @interface Header {
    /**
     * HTTP header name.
     */
    String value();

    /**
     * If true, request without this header will be rejected.
     */
    boolean required() default false;

    class HandlerImpl extends AnnotationHandler {
        public Object parse(StaplerRequest request, Header a, Class type, String parameterName) throws ServletException {
            String name = a.value();
            if(name.length()==0)    name=parameterName;
            if(name==null)
                throw new IllegalArgumentException("Parameter name unavailable neither in the code nor in annotation");

            String value = request.getHeader(name);
            if(a.required() && value==null)
                throw new ServletException("Required HTTP header "+name+" is missing");

            return convert(type,value);
        }
    }
}