/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *  
 *    http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License. 
 *  
 */
package org.apache.directory.server.core.jndi.referral;

import static org.apache.directory.server.core.integ.IntegrationUtils.getContext;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;

import java.util.HashSet;
import java.util.Set;

import javax.naming.NameNotFoundException;
import javax.naming.NamingEnumeration;
import javax.naming.PartialResultException;
import javax.naming.ReferralException;
import javax.naming.directory.Attributes;
import javax.naming.directory.BasicAttributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import javax.naming.ldap.LdapContext;

import org.apache.directory.api.ldap.model.cursor.Cursor;
import org.apache.directory.api.ldap.model.entry.DefaultEntry;
import org.apache.directory.api.ldap.model.entry.Entry;
import org.apache.directory.api.ldap.model.exception.LdapPartialResultException;
import org.apache.directory.api.ldap.model.exception.LdapReferralException;
import org.apache.directory.api.ldap.model.name.Dn;
import org.apache.directory.server.constants.ServerDNConstants;
import org.apache.directory.server.core.annotations.ApplyLdifs;
import org.apache.directory.server.core.annotations.CreateDS;
import org.apache.directory.server.core.api.CoreSession;
import org.apache.directory.server.core.integ.AbstractLdapTestUnit;
import org.apache.directory.server.core.integ.ApacheDSTestExtension;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;


/**
 * Tests the referral handling functionality for the Search operation 
 * within the server's core.
 * 
 * All the tests are described on this page :
 * http://cwiki.apache.org/confluence/display/DIRxSRVx11/Referral+Handling+Changes
 * 
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 */
@ExtendWith( ApacheDSTestExtension.class )
@CreateDS(name = "SearchReferralIT")
@ApplyLdifs( {
    // Root
    "dn: c=WW,ou=system",
    "objectClass: country",
    "objectClass: top",
    "c: WW",
    
    // Sub-root
    "dn: o=MNN,c=WW,ou=system",
    "objectClass: organization",
    "objectClass: top",
    "o: MNN",
    
    // Another Sub-root
    "dn: o=PNN,c=WW,ou=system",
    "objectClass: organization",
    "objectClass: top",
    "o: MNN",
    
    // Referral #1
    "dn: ou=Roles,o=MNN,c=WW,ou=system",
    "objectClass: extensibleObject",
    "objectClass: referral",
    "objectClass: top",
    "ou: Roles",
    "ref: ldap://hostd/ou=Roles,dc=apache,dc=org",
    
    // Referral #2
    "dn: ou=People,o=MNN,c=WW,ou=system",
    "objectClass: extensibleObject",
    "objectClass: referral",
    "objectClass: top",
    "ou: People",
    "ref: ldap://hostb/OU=People,DC=example,DC=com",
    "ref: ldap://hostc/OU=People,O=MNN,C=WW",
    
    // Entry # 1
    "dn: cn=Alex Karasulu,o=MNN,c=WW,ou=system",
    "objectClass: person",
    "objectClass: top",
    "cn: Alex Karasulu",
    "sn: akarasulu",
    
    // Entry # 2
    "dn: cn=Alex,o=MNN,c=WW,ou=system",
    "objectClass: person",
    "objectClass: top",
    "cn: Alex",
    "sn: akarasulu"
    }
)
public class SearchReferralIT extends AbstractLdapTestUnit
{

    /** The Context we are using to inject entries with JNDI */
    LdapContext MNNCtx;
    
    /** The entries we are using to do the tests */
    Attributes userEntry;
    Entry serverEntry;
    
    @BeforeEach
    public void setUp() throws Exception
    {
        MNNCtx = getContext( ServerDNConstants.ADMIN_SYSTEM_DN, getService(), "o=MNN,c=WW,ou=system" );

        // JNDI entry
        userEntry = new BasicAttributes( "objectClass", "top", true );
        userEntry.get( "objectClass" ).add( "person" );
        userEntry.put( "sn", "elecharny" );
        userEntry.put( "cn", "Emmanuel Lecharny" );
        
        // Core API entry
        Dn dn = new Dn( "cn=Emmanuel Lecharny, ou=apache, ou=people, o=MNN, c=WW, ou=system" );
        serverEntry = new DefaultEntry( getService().getSchemaManager(), dn );

        serverEntry.put( "ObjectClass", "top", "person" );
        serverEntry.put( "sn", "elecharny" );
        serverEntry.put( "cn", "Emmanuel Lecharny" );
    }

    
    /**
     * Test a search of a non existing entry (not a referral), with no referral 
     * in its ancestor.
     */
    @Test
    public void testSearchNotExistingSuperiorNoReferralAncestor() throws Exception
    {
        Attributes attrs = new BasicAttributes( "ObjectClass", "top", true );
        
        try
        {
            MNNCtx.search( "cn=nobody", attrs );
            fail();
        }
        catch ( NameNotFoundException nnfe )
        {
            assertTrue( true );
        }
    }

    
    /**
     * Test a search of a non existing entry (not a referral), with a referral 
     * in its ancestor, using JNDI throw.
     */
    @Test
    public void testSearchWithReferralAncestorJNDIThrow() throws Exception
    {
        Attributes attrs = new BasicAttributes( "ObjectClass", "top", true );
        
        try
        {
            MNNCtx.addToEnvironment( DirContext.REFERRAL, "throw" );
            MNNCtx.search( "ou=nobody,ou=apache,ou=roles", attrs );
            fail();
        }
        catch ( ReferralException re )
        {
            int nbRefs = 0;
            Set<String> expectedRefs = new HashSet<String>();
            expectedRefs.add( "ldap://hostd/ou=nobody,ou=apache,ou=Roles,dc=apache,dc=org??one" );
            
            do 
            {
                String ref = (String)re.getReferralInfo();
                
                assertTrue( expectedRefs.contains( ref ) );
                nbRefs ++;
            }
            while ( re.skipReferral() );
            
            assertEquals( 1, nbRefs );
        }
    }

    
    /**
     * Test a search of a non existing entry (not a referral), with a referral 
     * in its ancestor, using JNDI ignore.
     */
    @Test
    public void testSearchWithReferralAncestorJNDIIgnore() throws Exception
    {
        Attributes attrs = new BasicAttributes( "ObjectClass", "top", true );
        
        try
        {
            MNNCtx.addToEnvironment( DirContext.REFERRAL, "ignore" );
            MNNCtx.search( "ou=nobody,ou=apache,ou=roles", attrs );
            fail();
        }
        catch ( PartialResultException pre )
        {
            assertTrue( true );
        }
    }

    
    /**
     * Test a search of a non existing entry (not a referral), with a referral 
     * in its ancestor, using the Core API without the ManageDsaIt flag.
     */
    @Test
    public void testSearchWithReferralAncestorCoreAPIWithoutManageDSAIt() throws Exception
    {
        CoreSession coreSession = getService().getAdminSession();
        Dn dn = new Dn( "ou=nobody,ou=apache,ou=roles,o=Mnn,c=WW,ou=system" );
        
        try
        {
            coreSession.search( dn, "(ObjectClass=*)", false );
            fail();
        }
        catch ( LdapReferralException re )
        {
            int nbRefs = 0;
            Set<String> expectedRefs = new HashSet<String>();
            expectedRefs.add( "ldap://hostd/ou=nobody,ou=apache,ou=Roles,dc=apache,dc=org??base" );
            
            do 
            {
                String ref = (String)re.getReferralInfo();
                
                assertTrue( expectedRefs.contains( ref ) );
                nbRefs ++;
            }
            while ( re.skipReferral() );
            
            assertEquals( 1, nbRefs );
        }
    }

    
    /**
     * Test a search of a non existing entry (not a referral), with a referral 
     * in its ancestor, using the Core API with the ManageDsaIt flag.
     */
    @Test
    public void testSearchWithReferralAncestorCoreAPIWithManageDSAIt() throws Exception
    {
        CoreSession coreSession = getService().getAdminSession();
        Dn dn = new Dn( "ou=nobody,ou=apache,ou=roles,o=Mnn,c=WW,ou=system" );
        
        try
        {
            coreSession.search( dn, "(ObjectClass=*)", true );
            fail();
        }
        catch ( LdapPartialResultException lpre )
        {
            assertTrue( true );
        }
    }

    
    /**
     * Test a search of an existing entry (not a referral).
     */
    @Test
    public void testSearchExistingNoReferral() throws Exception
    {
        SearchControls sCtrls = new SearchControls();
        sCtrls.setReturningAttributes( new String[]{ "*" } );
        sCtrls.setSearchScope( SearchControls.OBJECT_SCOPE );
        
        NamingEnumeration<SearchResult> result = MNNCtx.search( "cn=Alex Karasulu", "(ObjectClass=top)", sCtrls );
        
        assertNotNull( result );
        int nbRes = 0;
        
        while ( result.hasMoreElements() )
        {
            SearchResult entry = result.nextElement();
            assertNotNull( entry );
            assertNotNull( entry.getAttributes() );
            assertNotNull( entry.getAttributes().get( "cn" ) );
            assertEquals( "Alex Karasulu", entry.getAttributes().get( "cn" ).get() );
            nbRes++;
        }
        
        assertEquals( 1, nbRes );
    }

    
    /**
     * Test a search of an existing referral, using JNDI throw.
     */
    @Test
    public void testSearchExistingReferralJNDIThrow() throws Exception
    {
        SearchControls sCtrls = new SearchControls();
        sCtrls.setReturningAttributes( new String[]{ "*" } );
        sCtrls.setSearchScope( SearchControls.OBJECT_SCOPE );
        
        MNNCtx.addToEnvironment( DirContext.REFERRAL, "throw" );
        
        try
        {
            MNNCtx.search( "ou=Roles", "(ObjectClass=top)", sCtrls );
            fail();
        }
        catch ( ReferralException re )
        {
            int nbRefs = 0;
            Set<String> expectedRefs = new HashSet<String>();
            expectedRefs.add( "ldap://hostd/ou=Roles,dc=apache,dc=org??base" );
            
            do 
            {
                String ref = (String)re.getReferralInfo();
                
                assertTrue( expectedRefs.contains( ref ) );
                nbRefs ++;
            }
            while ( re.skipReferral() );
            
            assertEquals( 1, nbRefs );
        }
    }

    
    /**
     * Test a search of an existing referral, using JNDI ignore.
     */
    @Test
    public void testSearchExistingReferralJNDIIgnore() throws Exception
    {
        SearchControls sCtrls = new SearchControls();
        sCtrls.setReturningAttributes( new String[]{ "*" } );
        sCtrls.setSearchScope( SearchControls.OBJECT_SCOPE );
        
        MNNCtx.addToEnvironment( DirContext.REFERRAL, "ignore" );
        
        NamingEnumeration<SearchResult> result = MNNCtx.search( "ou=Roles", "(ObjectClass=top)", sCtrls );
        
        assertNotNull( result );
        int nbRes = 0;
        
        while ( result.hasMoreElements() )
        {
            SearchResult entry = result.nextElement();
            assertNotNull( entry );
            assertNotNull( entry.getAttributes() );
            assertNotNull( entry.getAttributes().get( "ou" ) );
            assertEquals( "Roles", entry.getAttributes().get( "ou" ).get() );
            nbRes++;
        }
        
        assertEquals( 1, nbRes );
    }
    
    /**
     * Test a search of an existing referral, using the Core API without the ManageDsaIt flag.
     */
    @Test
    public void testSearchExistingReferralCoreAPIWithoutManageDsaIT() throws Exception
    {
        CoreSession coreSession = getService().getAdminSession();
        Dn dn = new Dn( "ou=roles,o=Mnn,c=WW,ou=system" );
        
        try
        {
            coreSession.search( dn, "(ObjectClass=*)", false );
            fail();
        }
        catch ( LdapReferralException re )
        {
            int nbRefs = 0;
            Set<String> expectedRefs = new HashSet<String>();
            expectedRefs.add( "ldap://hostd/ou=Roles,dc=apache,dc=org??base" );
            
            do 
            {
                String ref = (String)re.getReferralInfo();
                
                assertTrue( expectedRefs.contains( ref ) );
                nbRefs ++;
            }
            while ( re.skipReferral() );
            
            assertEquals( 1, nbRefs );
        }
    }

    
    /**
     * Test a search of an existing referral, using the Core API with the ManageDsaIt flag.
     */
    @Test
    public void testSearchExistingReferralCoreAPIWithManageDsaIT() throws Exception
    {
        CoreSession coreSession = getService().getAdminSession();
        Dn dn = new Dn( "ou=roles,o=Mnn,c=WW,ou=system" );
        
        Cursor<Entry> cursor = coreSession.search( dn, "(ObjectClass=*)", true );
        
        assertNotNull( cursor );
        
        cursor.beforeFirst();
        int nbRes = 0;
        
        while ( cursor.next() )
        {
            Entry entry = cursor.get();
            assertNotNull( entry );
            assertNotNull( entry.get( "ou" ) );
            assertEquals( "Roles", entry.get( "ou" ).getString() );
            nbRes++;
        }
        
        assertEquals( 1, nbRes );
    }
}
