/*
 * Copyright (c) 1999, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.jndi.url.ldap;

import javax.naming.spi.ResolveResult;
import javax.naming.*;
import javax.naming.directory.*;
import java.util.Hashtable;
import java.util.StringTokenizer;
import com.sun.jndi.ldap.LdapURL;

/**
 * An LDAP URL context.
 *
 * @author Rosanna Lee
 * @author Scott Seligman
 */

final public class ldapURLContext
        extends com.sun.jndi.toolkit.url.GenericURLDirContext {

    ldapURLContext(Hashtable env) {
        super(env);
    }

    /**
      * Resolves 'name' into a target context with remaining name.
      * It only resolves the hostname/port number. The remaining name
      * contains the root DN.
      *
      * For example, with a LDAP URL "ldap://localhost:389/o=widget,c=us",
      * this method resolves "ldap://localhost:389/" to the root LDAP
      * context on the server 'localhost' on port 389,
      * and returns as the remaining name "o=widget, c=us".
      */
    protected ResolveResult getRootURLContext(String name, Hashtable env)
    throws NamingException {
        return ldapURLContextFactory.getUsingURLIgnoreRootDN(name, env);
    }

    /**
     * Return the suffix of an ldap url.
     * prefix parameter is ignored.
     */
    protected Name getURLSuffix(String prefix, String url)
        throws NamingException {

        LdapURL ldapUrl = new LdapURL(url);
        String dn = (ldapUrl.getDN() != null? ldapUrl.getDN() : "");

        // Represent DN as empty or single-component composite name.
        CompositeName remaining = new CompositeName();
        if (!"".equals(dn)) {
            // if nonempty, add component
            remaining.add(dn);
        }
        return remaining;
    }

    /*
     * Override context operations.
     * Test for presence of LDAP URL query components in the name argument.
     * Query components are permitted only for search operations and only
     * when the name has a single component.
     */

    public Object lookup(String name) throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            return super.lookup(name);
        }
    }

    public Object lookup(Name name) throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.lookup(name);
        }
    }

    public void bind(String name, Object obj) throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            super.bind(name, obj);
        }
    }

    public void bind(Name name, Object obj) throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            super.bind(name, obj);
        }
    }

    public void rebind(String name, Object obj) throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            super.rebind(name, obj);
        }
    }

    public void rebind(Name name, Object obj) throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            super.rebind(name, obj);
        }
    }

    public void unbind(String name) throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            super.unbind(name);
        }
    }

    public void unbind(Name name) throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            super.unbind(name);
        }
    }

    public void rename(String oldName, String newName) throws NamingException {
        if (LdapURL.hasQueryComponents(oldName)) {
            throw new InvalidNameException(oldName);
        } else if (LdapURL.hasQueryComponents(newName)) {
            throw new InvalidNameException(newName);
        } else {
            super.rename(oldName, newName);
        }
    }

    public void rename(Name oldName, Name newName) throws NamingException {
        if (LdapURL.hasQueryComponents(oldName.get(0))) {
            throw new InvalidNameException(oldName.toString());
        } else if (LdapURL.hasQueryComponents(newName.get(0))) {
            throw new InvalidNameException(newName.toString());
        } else {
            super.rename(oldName, newName);
        }
    }

    public NamingEnumeration list(String name)  throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            return super.list(name);
        }
    }

    public NamingEnumeration list(Name name) throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.list(name);
        }
    }

    public NamingEnumeration listBindings(String name) throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            return super.listBindings(name);
        }
    }

    public NamingEnumeration listBindings(Name name) throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.listBindings(name);
        }
    }

    public void destroySubcontext(String name) throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            super.destroySubcontext(name);
        }
    }

    public void destroySubcontext(Name name) throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            super.destroySubcontext(name);
        }
    }

    public Context createSubcontext(String name) throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            return super.createSubcontext(name);
        }
    }

    public Context createSubcontext(Name name) throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.createSubcontext(name);
        }
    }

    public Object lookupLink(String name) throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            return super.lookupLink(name);
        }
    }

    public Object lookupLink(Name name) throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.lookupLink(name);
        }
    }

    public NameParser getNameParser(String name) throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            return super.getNameParser(name);
        }
    }

    public NameParser getNameParser(Name name) throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.getNameParser(name);
        }
    }

    public String composeName(String name, String prefix)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else if (LdapURL.hasQueryComponents(prefix)) {
            throw new InvalidNameException(prefix);
        } else {
            return super.composeName(name, prefix);
        }
    }

    public Name composeName(Name name, Name prefix) throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else if (LdapURL.hasQueryComponents(prefix.get(0))) {
            throw new InvalidNameException(prefix.toString());
        } else {
            return super.composeName(name, prefix);
        }
    }

    public Attributes getAttributes(String name) throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            return super.getAttributes(name);
        }
    }

    public Attributes getAttributes(Name name) throws NamingException  {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.getAttributes(name);
        }
    }

    public Attributes getAttributes(String name, String[] attrIds)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            return super.getAttributes(name, attrIds);
        }
    }

    public Attributes getAttributes(Name name, String[] attrIds)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.getAttributes(name, attrIds);
        }
    }

    public void modifyAttributes(String name, int mod_op, Attributes attrs)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            super.modifyAttributes(name, mod_op, attrs);
        }
    }

    public void modifyAttributes(Name name, int mod_op, Attributes attrs)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            super.modifyAttributes(name, mod_op, attrs);
        }
    }

    public void modifyAttributes(String name, ModificationItem[] mods)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            super.modifyAttributes(name, mods);
        }
    }

    public void modifyAttributes(Name name, ModificationItem[] mods)
        throws NamingException  {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            super.modifyAttributes(name, mods);
        }
    }

    public void bind(String name, Object obj, Attributes attrs)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            super.bind(name, obj, attrs);
        }
    }

    public void bind(Name name, Object obj, Attributes attrs)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            super.bind(name, obj, attrs);
        }
    }

    public void rebind(String name, Object obj, Attributes attrs)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            super.rebind(name, obj, attrs);
        }
    }

    public void rebind(Name name, Object obj, Attributes attrs)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            super.rebind(name, obj, attrs);
        }
    }

    public DirContext createSubcontext(String name, Attributes attrs)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            return super.createSubcontext(name, attrs);
        }
    }

    public DirContext createSubcontext(Name name, Attributes attrs)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.createSubcontext(name, attrs);
        }
    }

    public DirContext getSchema(String name) throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            return super.getSchema(name);
        }
    }

    public DirContext getSchema(Name name) throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.getSchema(name);
        }
    }

    public DirContext getSchemaClassDefinition(String name)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name)) {
            throw new InvalidNameException(name);
        } else {
            return super.getSchemaClassDefinition(name);
        }
    }

    public DirContext getSchemaClassDefinition(Name name)
        throws NamingException {
        if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.getSchemaClassDefinition(name);
        }
    }

    // divert the search operation when the LDAP URL has query components
    public NamingEnumeration search(String name,
        Attributes matchingAttributes)
        throws NamingException {

        if (LdapURL.hasQueryComponents(name)) {
            return searchUsingURL(name);
        } else {
            return super.search(name, matchingAttributes);
        }
    }

    // divert the search operation when name has a single component
    public NamingEnumeration search(Name name,
        Attributes matchingAttributes)
        throws NamingException {
        if (name.size() == 1) {
            return search(name.get(0), matchingAttributes);
        } else if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.search(name, matchingAttributes);
        }
    }

    // divert the search operation when the LDAP URL has query components
    public NamingEnumeration search(String name,
        Attributes matchingAttributes,
        String[] attributesToReturn)
        throws NamingException {

        if (LdapURL.hasQueryComponents(name)) {
            return searchUsingURL(name);
        } else {
            return super.search(name, matchingAttributes, attributesToReturn);
        }
    }

    // divert the search operation when name has a single component
    public NamingEnumeration search(Name name,
        Attributes matchingAttributes,
        String[] attributesToReturn)
        throws NamingException {

        if (name.size() == 1) {
            return search(name.get(0), matchingAttributes, attributesToReturn);
        } else if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.search(name, matchingAttributes, attributesToReturn);
        }
    }

    // divert the search operation when the LDAP URL has query components
    public NamingEnumeration search(String name,
        String filter,
        SearchControls cons)
        throws NamingException {

        if (LdapURL.hasQueryComponents(name)) {
            return searchUsingURL(name);
        } else {
            return super.search(name, filter, cons);
        }
    }

    // divert the search operation when name has a single component
    public NamingEnumeration search(Name name,
        String filter,
        SearchControls cons)
        throws NamingException {

        if (name.size() == 1) {
            return search(name.get(0), filter, cons);
        } else if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.search(name, filter, cons);
        }
    }

    // divert the search operation when the LDAP URL has query components
    public NamingEnumeration search(String name,
        String filterExpr,
        Object[] filterArgs,
        SearchControls cons)
        throws NamingException {

        if (LdapURL.hasQueryComponents(name)) {
            return searchUsingURL(name);
        } else {
            return super.search(name, filterExpr, filterArgs, cons);
        }
    }

    // divert the search operation when name has a single component
    public NamingEnumeration search(Name name,
        String filterExpr,
        Object[] filterArgs,
        SearchControls cons)
        throws NamingException {

        if (name.size() == 1) {
            return search(name.get(0), filterExpr, filterArgs, cons);
        } else if (LdapURL.hasQueryComponents(name.get(0))) {
            throw new InvalidNameException(name.toString());
        } else {
            return super.search(name, filterExpr, filterArgs, cons);
        }
    }

    // Search using the LDAP URL in name.
    // LDAP URL query components override the search argments.
    private NamingEnumeration searchUsingURL(String name)
        throws NamingException {

        LdapURL url = new LdapURL(name);

        ResolveResult res = getRootURLContext(name, myEnv);
        DirContext ctx = (DirContext)res.getResolvedObj();
        try {
            return ctx.search(res.getRemainingName(),
                              setFilterUsingURL(url),
                              setSearchControlsUsingURL(url));
        } finally {
            ctx.close();
        }
    }

    /*
     * Initialize a String filter using the LDAP URL filter component.
     * If filter is not present in the URL it is initialized to its default
     * value as specified in RFC-2255.
     */
    private static String setFilterUsingURL(LdapURL url) {

        String filter = url.getFilter();

        if (filter == null) {
            filter = "(objectClass=*)"; //default value
        }
        return filter;
    }

    /*
     * Initialize a SearchControls object using LDAP URL query components.
     * Components not present in the URL are initialized to their default
     * values as specified in RFC-2255.
     */
    private static SearchControls setSearchControlsUsingURL(LdapURL url) {

        SearchControls cons = new SearchControls();
        String scope = url.getScope();
        String attributes = url.getAttributes();

        if (scope == null) {
            cons.setSearchScope(SearchControls.OBJECT_SCOPE); //default value
        } else {
            if (scope.equals("sub")) {
                cons.setSearchScope(SearchControls.SUBTREE_SCOPE);
            } else if (scope.equals("one")) {
                cons.setSearchScope(SearchControls.ONELEVEL_SCOPE);
            } else if (scope.equals("base")) {
                cons.setSearchScope(SearchControls.OBJECT_SCOPE);
            }
        }

        if (attributes == null) {
            cons.setReturningAttributes(null); //default value
        } else {
            StringTokenizer tokens = new StringTokenizer(attributes, ",");
            int count = tokens.countTokens();
            String[] attrs = new String[count];
            for (int i = 0; i < count; i ++) {
                attrs[i] = tokens.nextToken();
            }
            cons.setReturningAttributes(attrs);
        }
        return cons;
    }
}