de.intarsys.pdf.crypt.StandardAuthenticationHandlerFactory Maven / Gradle / Ivy

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/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * 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.
 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * 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 de.intarsys.pdf.crypt;

import de.intarsys.pdf.st.STDocument;
import de.intarsys.tools.attribute.Attribute;

/**
 * The standard factory for an {@link IAuthenticationHandler}.
 */
public class StandardAuthenticationHandlerFactory implements IAuthenticationHandlerFactory {

    private static final Attribute ATTR_AUTHENTICATIONHANDLER = new Attribute("authenticationHandler");

    /**
     * This implementation will return the same {@link IAuthenticationHandler}
     * for a document on every request.
     *
     * @see de.intarsys.pdf.crypt.IAuthenticationHandlerFactory#createAuthenticationHandler(de.intarsys.pdf.crypt.ISecurityHandler)
     */
    @Override
    public IAuthenticationHandler createAuthenticationHandler(ISecurityHandler securityHandler) {
        STDocument doc = securityHandler.stGetDoc();
        if (doc == null) {
            return new StandardAuthenticationHandler();
        }
        IAuthenticationHandler handler = (IAuthenticationHandler) doc.getAttribute(ATTR_AUTHENTICATIONHANDLER);
        if (handler == null) {
            handler = new StandardAuthenticationHandler();
            doc.setAttribute(ATTR_AUTHENTICATIONHANDLER, handler);
        }
        return handler;
    }
}