/*

 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package com.sun.org.apache.xerces.internal.utils;

import com.sun.org.apache.xerces.internal.impl.Constants;

import javax.xml.XMLConstants;

/**

 * This class manages security related properties

 *

 */

public final class XMLSecurityPropertyManager {

    /**

     * States of the settings of a property, in the order: default value, value

     * set by FEATURE_SECURE_PROCESSING, jaxp.properties file, jaxp system

     * properties, and jaxp api properties

     */

    public static enum State {

        //this order reflects the overriding order

        DEFAULT, FSP, JAXPDOTPROPERTIES, SYSTEMPROPERTY, APIPROPERTY

    }

    /**

     * Limits managed by the security manager

     */

    public static enum Property {

        ACCESS_EXTERNAL_DTD(XMLConstants.ACCESS_EXTERNAL_DTD,

                Constants.EXTERNAL_ACCESS_DEFAULT),

        ACCESS_EXTERNAL_SCHEMA(XMLConstants.ACCESS_EXTERNAL_SCHEMA,

                Constants.EXTERNAL_ACCESS_DEFAULT);

        final String name;

        final String defaultValue;

        Property(String name, String value) {

            this.name = name;

            this.defaultValue = value;

        }

        public boolean equalsName(String propertyName) {

            return (propertyName == null) ? false : name.equals(propertyName);

        }

        String defaultValue() {

            return defaultValue;

        }

    }

    /**

     * Values of the properties as defined in enum Properties

     */

    private final String[] values;

    /**

     * States of the settings for each property in Properties above

     */

    private State[] states = {State.DEFAULT, State.DEFAULT};

    /**

     * Default constructor. Establishes default values

     */

    public XMLSecurityPropertyManager() {

        values = new String[Property.values().length];

        for (Property property : Property.values()) {

            values[property.ordinal()] = property.defaultValue();

        }

        //read system properties or jaxp.properties

        readSystemProperties();

    }

    /**

     * Set the value for a specific property.

     *

     * @param property the property

     * @param state the state of the property

     * @param value the value of the property

     */

    public void setValue(Property property, State state, String value) {

        //only update if it shall override

        if (state.compareTo(states[property.ordinal()]) >= 0) {

            values[property.ordinal()] = value;

            states[property.ordinal()] = state;

        }

    }

    /**

     * Set the value of a property by its index

     * @param index the index of the property

     * @param state the state of the property

     * @param value the value of the property

     */

    public void setValue(int index, State state, String value) {

        //only update if it shall override

        if (state.compareTo(states[index]) >= 0) {

            values[index] = value;

            states[index] = state;

        }

    }

    /**

     * Return the value of the specified property

     *

     * @param property the property

     * @return the value of the property

     */

    public String getValue(Property property) {

        return values[property.ordinal()];

    }

    /**

     * Return the value of a property by its ordinal

     * @param index the index of a property

     * @return value of a property

     */

    public String getValueByIndex(int index) {

        return values[index];

    }

    /**

     * Get the index by property name

     * @param propertyName property name

     * @return the index of the property if found; return -1 if not

     */

    public int getIndex(String propertyName){

        for (Property property : Property.values()) {

            if (property.equalsName(propertyName)) {

                //internally, ordinal is used as index

                return property.ordinal();

            }

        }

        return -1;

    }

    /**

     * Read from system properties, or those in jaxp.properties

     */

    private void readSystemProperties() {

        getSystemProperty(Property.ACCESS_EXTERNAL_DTD,

                Constants.SP_ACCESS_EXTERNAL_DTD);

        getSystemProperty(Property.ACCESS_EXTERNAL_SCHEMA,

                Constants.SP_ACCESS_EXTERNAL_SCHEMA);

    }

    /**

     * Read from system properties, or those in jaxp.properties

     *

     * @param property the property

     * @param systemProperty the name of the system property

     */

    private void getSystemProperty(Property property, String systemProperty) {

        try {

            String value = SecuritySupport.getSystemProperty(systemProperty);

            if (value != null) {

                values[property.ordinal()] = value;

                states[property.ordinal()] = State.SYSTEMPROPERTY;

                return;

            }

            value = SecuritySupport.readJAXPProperty(systemProperty);

            if (value != null) {

                values[property.ordinal()] = value;

                states[property.ordinal()] = State.JAXPDOTPROPERTIES;

            }

        } catch (NumberFormatException e) {

            //invalid setting ignored

        }

    }

}