/* Copyright (c) 2001-2011, The HSQL Development Group
 * 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.
 *
 * Neither the name of the HSQL Development Group 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
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package org.hsqldb.rights;

import org.hsqldb.HsqlNameManager;
import org.hsqldb.HsqlNameManager.HsqlName;
import org.hsqldb.Tokens;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.MD5;
import org.hsqldb.lib.StringConverter;

/**
 * A User Object extends Grantee with password for a
 * particular database user.<p>
 *
 * @author Campbell Boucher-Burnet (boucherb@users dot sourceforge.net)
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @author Blaine Simpson (blaine dot simpson at admc dot com)
 *
 * @version 2.1.1
 * @since 1.8.0
 */
public class User extends Grantee {

    /** password. */
    private String password;
    public boolean isLocalOnly;
    public boolean isExternalOnly;

    /** default schema when new Sessions started (defaults to PUBLIC schema) */
    private HsqlName initialSchema = null;

    /**
     * Constructor
     */
    User(HsqlName name, GranteeManager manager) {

        super(name, manager);

        if (manager != null) {
            updateAllRights();
        }
    }

    public String getSQL() {

        StringBuffer sb = new StringBuffer();

        sb.append(Tokens.T_CREATE).append(' ').append(Tokens.T_USER);
        sb.append(' ').append(granteeName.statementName).append(' ');
        sb.append(Tokens.T_PASSWORD).append(' ').append(Tokens.T_DIGEST);
        sb.append(' ').append('\'').append(password).append('\'');

        return sb.toString();
    }

    public String getPasswordDigest() {
        return password;
    }

    public void setPassword(String password, boolean isDigest) {

        if (!isDigest) {
            password = MD5.encode(password, null);
        }

        this.password = password;
    }

    /**
     * Checks if this object's password attibute equals
     * specified argument, else throws.
     */
    public void checkPassword(String value) {

        String digest = MD5.encode(value, null);

        if (!digest.equals(password)) {
            throw Error.error(ErrorCode.X_28000);
        }
    }

    /**
     * Returns the initial schema for the user
     */
    public HsqlName getInitialSchema() {
        return initialSchema;
    }

    public HsqlName getInitialOrDefaultSchema() {

        if (initialSchema != null) {
            return initialSchema;
        }

        HsqlName schema =
            granteeManager.database.schemaManager.findSchemaHsqlName(
                getName().getNameString());

        if (schema == null) {
            return granteeManager.database.schemaManager
                .getDefaultSchemaHsqlName();
        } else {
            return schema;
        }
    }

    /**
     * This class does not have access to the SchemaManager, therefore
     * caller should verify that the given schemaName exists.
     *
     * @param schema An existing schema.  Null value allowed,
     *                   which means use the DB default session schema.
     */
    public void setInitialSchema(HsqlName schema) {
        initialSchema = schema;
    }

    public String getInitialSchemaSQL() {

        StringBuffer sb = new StringBuffer();

        sb.append(Tokens.T_ALTER).append(' ');
        sb.append(Tokens.T_USER).append(' ');
        sb.append(getName().getStatementName()).append(' ');
        sb.append(Tokens.T_SET).append(' ');
        sb.append(Tokens.T_INITIAL).append(' ');
        sb.append(Tokens.T_SCHEMA).append(' ');
        sb.append(initialSchema.getStatementName());

        return sb.toString();
    }

    /**
     * Returns the DDL string for local authentication.
     *
     */
    public String getLocalUserSQL() {

        StringBuffer sb = new StringBuffer(64);

        sb.append(Tokens.T_ALTER).append(' ');
        sb.append(Tokens.T_USER).append(' ');
        sb.append(getName().getStatementName()).append(' ');
        sb.append(Tokens.T_SET).append(' ').append(Tokens.T_LOCAL);
        sb.append(' ').append(Tokens.T_TRUE);

        return sb.toString();
    }

    /**
     * Returns the SQL string for setting password digest.
     *
     */
    public String getSetPasswordDigestSQL() {

        StringBuffer sb = new StringBuffer(64);

        sb.append(Tokens.T_ALTER).append(' ');
        sb.append(Tokens.T_USER).append(' ');
        sb.append(getName().getStatementName()).append(' ');
        sb.append(Tokens.T_SET).append(' ');
        sb.append(Tokens.T_PASSWORD).append(' ').append(Tokens.T_DIGEST);
        sb.append(' ').append('\'').append(password).append('\'');

        return sb.toString();
    }

    /**
     * Returns the SQL string for setting password digest.
     *
     */
    public static String getSetCurrentPasswordDigestSQL(String password,
            boolean isDigest) {

        if (!isDigest) {
            password = MD5.encode(password, null);
        }

        StringBuffer sb = new StringBuffer(64);

        sb.append(Tokens.T_SET).append(' ');
        sb.append(Tokens.T_PASSWORD).append(' ').append(Tokens.T_DIGEST);
        sb.append(' ').append('\'').append(password).append('\'');

        return sb.toString();
    }

    /**
     * Retrieves the redo log character sequence for connecting
     * this user
     *
     * @return the redo log character sequence for connecting
     *      this user
     */
    public String getConnectUserSQL() {

        StringBuffer sb = new StringBuffer();

        sb.append(Tokens.T_SET).append(' ');
        sb.append(Tokens.T_SESSION).append(' ');
        sb.append(Tokens.T_AUTHORIZATION).append(' ');
        sb.append(StringConverter.toQuotedString(getName().getNameString(),
                '\'', true));

        return sb.toString();
    }
}
