/*
 * 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.catalina.valves;

import java.io.IOException;

import jakarta.servlet.ServletException;

import org.junit.Assert;
import org.junit.Test;

import org.apache.catalina.Context;
import org.apache.catalina.connector.Connector;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;
import org.apache.catalina.core.StandardContext;

/**
 * {@link RequestFilterValve} Tests
 */
public class TestRequestFilterValve {

    private static final int OK = 200;
    private static final int FORBIDDEN = 403;
    private static final int CUSTOM = 499;

    private static final String ADDR_ALLOW_PAT = "127\\.\\d*\\.\\d*\\.\\d*";
    private static final String ADDR_DENY_PAT = "\\d*\\.\\d*\\.\\d*\\.1";
    private static final String ADDR_ONLY_ALLOW = "127.0.0.2";
    private static final String ADDR_ONLY_DENY = "192.168.0.1";
    private static final String ADDR_ALLOW_AND_DENY = "127.0.0.1";
    private static final String ADDR_NO_ALLOW_NO_DENY = "192.168.0.2";

    private static final String HOST_ALLOW_PAT = "www\\.example\\.[a-zA-Z0-9-]*";
    private static final String HOST_DENY_PAT = ".*\\.org";
    private static final String HOST_ONLY_ALLOW = "www.example.com";
    private static final String HOST_ONLY_DENY = "host.example.org";
    private static final String HOST_ALLOW_AND_DENY = "www.example.org";
    private static final String HOST_NO_ALLOW_NO_DENY = "host.example.com";

    private static final String CIDR_ALLOW_PROP = "127.0.0.0/16";
    private static final String CIDR_DENY_PROP = "192.168.0.0/24,127.0.0.0/24";
    private static final String CIDR_ONLY_ALLOW = "127.0.1.1";
    private static final String CIDR_ONLY_DENY = "192.168.0.1";
    private static final String CIDR_ALLOW_AND_DENY = "127.0.0.1";
    private static final String CIDR_NO_ALLOW_NO_DENY = "192.168.1.1";

    private static final String CIDR6_ALLOW_PROP = "::/96";
    private static final String CIDR6_DENY_PROP = "::f:0:0/112,::/112";
    private static final String CIDR6_ONLY_ALLOW = "0:0:0:0:0:0:148f:1";
    private static final String CIDR6_ONLY_DENY = "0:0:0:0:0:F:0:a";
    private static final String CIDR6_ALLOW_AND_DENY = "0:0:0:0:0:0:0:fA8";
    private static final String CIDR6_NO_ALLOW_NO_DENY = "1:0:0:0:0:0:0:1";

    private static final int PORT = 8080;
    private static final String ADDR_OTHER = "1.2.3.4";
    private static final String PORT_MATCH_PATTERN = ";\\d*";
    private static final String PORT_NO_MATCH_PATTERN = ";8081";


    static class TerminatingValve extends ValveBase {
        @Override
        public void invoke(Request request, Response response) throws IOException, ServletException {
        }
    }

    public static class MockResponse extends Response {
        private int status = OK;

        @Override
        public void sendError(int status) throws IOException {
            this.status = status;
        }

        @Override
        public int getStatus() {
            return status;
        }
    }

    private void twoTests(String allow, String deny, boolean denyStatus, boolean addConnectorPort, boolean auth,
            String property, String type, boolean allowed) {
        oneTest(allow, deny, denyStatus, addConnectorPort, false, auth, property, type, allowed);
        if (!type.equals("Host")) {
            oneTest(allow, deny, denyStatus, addConnectorPort, true, auth, property, type, allowed);
        }
    }

    private void oneTest(String allow, String deny, boolean denyStatus, boolean addConnectorPort,
            boolean usePeerAddress, boolean auth, String property, String type, boolean allowed) {
        // PREPARE
        RequestFilterValve valve = null;
        Connector connector = new Connector();
        Context context = new StandardContext();
        Request request = new Request(connector);
        Response response = new MockResponse();
        StringBuilder msg = new StringBuilder();
        int expected = allowed ? OK : FORBIDDEN;

        connector.setPort(PORT);
        request.getMappingData().context = context;
        request.setCoyoteRequest(new org.apache.coyote.Request());

        Assert.assertNotNull("Invalid test with null type", type);

        request.setCoyoteRequest(new org.apache.coyote.Request());

        if (property != null) {
            if (type.equals("Addr")) {
                valve = new RemoteAddrValve();
                if (usePeerAddress) {
                    request.setRemoteAddr(ADDR_OTHER);
                    request.getCoyoteRequest().peerAddr().setString(property);
                    ((RemoteAddrValve) valve).setUsePeerAddress(true);
                    msg.append(" peer='" + property + "'");
                } else {
                    request.setRemoteAddr(property);
                    request.getCoyoteRequest().peerAddr().setString(ADDR_OTHER);
                    msg.append(" ip='" + property + "'");
                }
            } else if (type.equals("Host")) {
                valve = new RemoteHostValve();
                request.setRemoteHost(property);
                msg.append(" host='" + property + "'");
            } else if (type.equals("CIDR")) {
                valve = new RemoteCIDRValve();
                if (usePeerAddress) {
                    request.setRemoteAddr(ADDR_OTHER);
                    request.getCoyoteRequest().peerAddr().setString(property);
                    ((RemoteCIDRValve) valve).setUsePeerAddress(true);
                    msg.append(" peer='" + property + "'");
                } else {
                    request.setRemoteAddr(property);
                    request.getCoyoteRequest().peerAddr().setString(ADDR_OTHER);
                    msg.append(" ip='" + property + "'");
                }
            }
        }
        Assert.assertNotNull("Invalid test type" + type, valve);
        valve.setNext(new TerminatingValve());

        if (allow != null) {
            valve.setAllow(allow);
            msg.append(" allow='" + allow + "'");
        }
        if (deny != null) {
            valve.setDeny(deny);
            msg.append(" deny='" + deny + "'");
        }
        if (denyStatus) {
            valve.setDenyStatus(CUSTOM);
            msg.append(" denyStatus='" + CUSTOM + "'");
            if (!allowed) {
                expected = CUSTOM;
            }
        }
        if (addConnectorPort) {
            if (valve instanceof RemoteAddrValve) {
                ((RemoteAddrValve) valve).setAddConnectorPort(true);
            } else if (valve instanceof RemoteHostValve) {
                ((RemoteHostValve) valve).setAddConnectorPort(true);
            } else if (valve instanceof RemoteCIDRValve) {
                ((RemoteCIDRValve) valve).setAddConnectorPort(true);
            } else {
                Assert.fail("Can only set 'addConnectorPort' for RemoteAddrValve, RemoteHostValve and RemoteCIDRValve");
            }
            msg.append(" addConnectorPort='true'");
        }
        if (auth) {
            context.setPreemptiveAuthentication(true);
            valve.setInvalidAuthenticationWhenDeny(true);
            msg.append(" auth='true'");
        }

        // TEST
        try {
            valve.invoke(request, response);
        } catch (IOException | ServletException ex) {
            // Ignore
        }

        // VERIFY
        if (!allowed && auth) {
            Assert.assertEquals(msg.toString(), OK, response.getStatus());
            Assert.assertEquals(msg.toString(), "invalid", request.getHeader("authorization"));
        } else {
            Assert.assertEquals(msg.toString(), expected, response.getStatus());
        }
    }

    private void standardTests(String allow_pat, String deny_pat, String OnlyAllow, String OnlyDeny,
            String AllowAndDeny, String NoAllowNoDeny, boolean auth, String type) {
        String apat;
        String dpat;

        // Test without ports
        apat = allow_pat;
        dpat = deny_pat;
        twoTests(null, null, false, false, auth, AllowAndDeny, type, false);
        twoTests(null, null, true, false, auth, AllowAndDeny, type, false);
        twoTests(apat, null, false, false, auth, AllowAndDeny, type, true);
        twoTests(apat, null, false, false, auth, NoAllowNoDeny, type, false);
        twoTests(apat, null, true, false, auth, AllowAndDeny, type, true);
        twoTests(apat, null, true, false, auth, NoAllowNoDeny, type, false);
        twoTests(null, dpat, false, false, auth, AllowAndDeny, type, false);
        twoTests(null, dpat, false, false, auth, NoAllowNoDeny, type, true);
        twoTests(null, dpat, true, false, auth, AllowAndDeny, type, false);
        twoTests(null, dpat, true, false, auth, NoAllowNoDeny, type, true);
        twoTests(apat, dpat, false, false, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, false, false, auth, OnlyAllow, type, true);
        twoTests(apat, dpat, false, false, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, false, false, auth, AllowAndDeny, type, false);
        twoTests(apat, dpat, true, false, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, true, false, auth, OnlyAllow, type, true);
        twoTests(apat, dpat, true, false, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, true, false, auth, AllowAndDeny, type, false);

        // Test with port in pattern but forgotten "addConnectorPort"
        apat = allow_pat + PORT_MATCH_PATTERN;
        dpat = deny_pat + PORT_MATCH_PATTERN;
        twoTests(null, null, false, false, auth, AllowAndDeny, type, false);
        twoTests(null, null, true, false, auth, AllowAndDeny, type, false);
        twoTests(apat, null, false, false, auth, AllowAndDeny, type, false);
        twoTests(apat, null, false, false, auth, NoAllowNoDeny, type, false);
        twoTests(apat, null, true, false, auth, AllowAndDeny, type, false);
        twoTests(apat, null, true, false, auth, NoAllowNoDeny, type, false);
        twoTests(null, dpat, false, false, auth, AllowAndDeny, type, true);
        twoTests(null, dpat, false, false, auth, NoAllowNoDeny, type, true);
        twoTests(null, dpat, true, false, auth, AllowAndDeny, type, true);
        twoTests(null, dpat, true, false, auth, NoAllowNoDeny, type, true);
        twoTests(apat, dpat, false, false, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, false, false, auth, OnlyAllow, type, false);
        twoTests(apat, dpat, false, false, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, false, false, auth, AllowAndDeny, type, false);
        twoTests(apat, dpat, true, false, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, true, false, auth, OnlyAllow, type, false);
        twoTests(apat, dpat, true, false, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, true, false, auth, AllowAndDeny, type, false);

        // Test with "addConnectorPort" but port not in pattern
        apat = allow_pat;
        dpat = deny_pat;
        twoTests(null, null, false, true, auth, AllowAndDeny, type, false);
        twoTests(null, null, true, true, auth, AllowAndDeny, type, false);
        twoTests(apat, null, false, true, auth, AllowAndDeny, type, false);
        twoTests(apat, null, false, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, null, true, true, auth, AllowAndDeny, type, false);
        twoTests(apat, null, true, true, auth, NoAllowNoDeny, type, false);
        twoTests(null, dpat, false, true, auth, AllowAndDeny, type, true);
        twoTests(null, dpat, false, true, auth, NoAllowNoDeny, type, true);
        twoTests(null, dpat, true, true, auth, AllowAndDeny, type, true);
        twoTests(null, dpat, true, true, auth, NoAllowNoDeny, type, true);
        twoTests(apat, dpat, false, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, false, true, auth, OnlyAllow, type, false);
        twoTests(apat, dpat, false, true, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, false, true, auth, AllowAndDeny, type, false);
        twoTests(apat, dpat, true, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, true, true, auth, OnlyAllow, type, false);
        twoTests(apat, dpat, true, true, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, true, true, auth, AllowAndDeny, type, false);

        // Test "addConnectorPort" and with port matching in both patterns
        apat = allow_pat + PORT_MATCH_PATTERN;
        dpat = deny_pat + PORT_MATCH_PATTERN;
        twoTests(null, null, false, true, auth, AllowAndDeny, type, false);
        twoTests(null, null, true, true, auth, AllowAndDeny, type, false);
        twoTests(apat, null, false, true, auth, AllowAndDeny, type, true);
        twoTests(apat, null, false, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, null, true, true, auth, AllowAndDeny, type, true);
        twoTests(apat, null, true, true, auth, NoAllowNoDeny, type, false);
        twoTests(null, dpat, false, true, auth, AllowAndDeny, type, false);
        twoTests(null, dpat, false, true, auth, NoAllowNoDeny, type, true);
        twoTests(null, dpat, true, true, auth, AllowAndDeny, type, false);
        twoTests(null, dpat, true, true, auth, NoAllowNoDeny, type, true);
        twoTests(apat, dpat, false, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, false, true, auth, OnlyAllow, type, true);
        twoTests(apat, dpat, false, true, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, false, true, auth, AllowAndDeny, type, false);
        twoTests(apat, dpat, true, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, true, true, auth, OnlyAllow, type, true);
        twoTests(apat, dpat, true, true, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, true, true, auth, AllowAndDeny, type, false);

        // Test "addConnectorPort" and with port not matching in both patterns
        apat = allow_pat + PORT_NO_MATCH_PATTERN;
        dpat = deny_pat + PORT_NO_MATCH_PATTERN;
        twoTests(null, null, false, true, auth, AllowAndDeny, type, false);
        twoTests(null, null, true, true, auth, AllowAndDeny, type, false);
        twoTests(apat, null, false, true, auth, AllowAndDeny, type, false);
        twoTests(apat, null, false, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, null, true, true, auth, AllowAndDeny, type, false);
        twoTests(apat, null, true, true, auth, NoAllowNoDeny, type, false);
        twoTests(null, dpat, false, true, auth, AllowAndDeny, type, true);
        twoTests(null, dpat, false, true, auth, NoAllowNoDeny, type, true);
        twoTests(null, dpat, true, true, auth, AllowAndDeny, type, true);
        twoTests(null, dpat, true, true, auth, NoAllowNoDeny, type, true);
        twoTests(apat, dpat, false, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, false, true, auth, OnlyAllow, type, false);
        twoTests(apat, dpat, false, true, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, false, true, auth, AllowAndDeny, type, false);
        twoTests(apat, dpat, true, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, true, true, auth, OnlyAllow, type, false);
        twoTests(apat, dpat, true, true, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, true, true, auth, AllowAndDeny, type, false);

        // Test "addConnectorPort" and with port matching only in allow
        apat = allow_pat + PORT_MATCH_PATTERN;
        dpat = deny_pat + PORT_NO_MATCH_PATTERN;
        twoTests(null, null, false, true, auth, AllowAndDeny, type, false);
        twoTests(null, null, true, true, auth, AllowAndDeny, type, false);
        twoTests(apat, null, false, true, auth, AllowAndDeny, type, true);
        twoTests(apat, null, false, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, null, true, true, auth, AllowAndDeny, type, true);
        twoTests(apat, null, true, true, auth, NoAllowNoDeny, type, false);
        twoTests(null, dpat, false, true, auth, AllowAndDeny, type, true);
        twoTests(null, dpat, false, true, auth, NoAllowNoDeny, type, true);
        twoTests(null, dpat, true, true, auth, AllowAndDeny, type, true);
        twoTests(null, dpat, true, true, auth, NoAllowNoDeny, type, true);
        twoTests(apat, dpat, false, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, false, true, auth, OnlyAllow, type, true);
        twoTests(apat, dpat, false, true, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, false, true, auth, AllowAndDeny, type, true);
        twoTests(apat, dpat, true, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, true, true, auth, OnlyAllow, type, true);
        twoTests(apat, dpat, true, true, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, true, true, auth, AllowAndDeny, type, true);

        // Test "addConnectorPort" and with port matching only in deny
        apat = allow_pat + PORT_NO_MATCH_PATTERN;
        dpat = deny_pat + PORT_MATCH_PATTERN;
        twoTests(null, null, false, true, auth, AllowAndDeny, type, false);
        twoTests(null, null, true, true, auth, AllowAndDeny, type, false);
        twoTests(apat, null, false, true, auth, AllowAndDeny, type, false);
        twoTests(apat, null, false, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, null, true, true, auth, AllowAndDeny, type, false);
        twoTests(apat, null, true, true, auth, NoAllowNoDeny, type, false);
        twoTests(null, dpat, false, true, auth, AllowAndDeny, type, false);
        twoTests(null, dpat, false, true, auth, NoAllowNoDeny, type, true);
        twoTests(null, dpat, true, true, auth, AllowAndDeny, type, false);
        twoTests(null, dpat, true, true, auth, NoAllowNoDeny, type, true);
        twoTests(apat, dpat, false, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, false, true, auth, OnlyAllow, type, false);
        twoTests(apat, dpat, false, true, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, false, true, auth, AllowAndDeny, type, false);
        twoTests(apat, dpat, true, true, auth, NoAllowNoDeny, type, false);
        twoTests(apat, dpat, true, true, auth, OnlyAllow, type, false);
        twoTests(apat, dpat, true, true, auth, OnlyDeny, type, false);
        twoTests(apat, dpat, true, true, auth, AllowAndDeny, type, false);
    }

    @Test
    public void testRemoteAddrValveIPv4() {
        standardTests(ADDR_ALLOW_PAT, ADDR_DENY_PAT, ADDR_ONLY_ALLOW, ADDR_ONLY_DENY, ADDR_ALLOW_AND_DENY,
                ADDR_NO_ALLOW_NO_DENY, false, "Addr");
        standardTests(ADDR_ALLOW_PAT, ADDR_DENY_PAT, ADDR_ONLY_ALLOW, ADDR_ONLY_DENY, ADDR_ALLOW_AND_DENY,
                ADDR_NO_ALLOW_NO_DENY, true, "Addr");
    }

    @Test
    public void testRemoteHostValve() {
        standardTests(HOST_ALLOW_PAT, HOST_DENY_PAT, HOST_ONLY_ALLOW, HOST_ONLY_DENY, HOST_ALLOW_AND_DENY,
                HOST_NO_ALLOW_NO_DENY, false, "Host");
        standardTests(HOST_ALLOW_PAT, HOST_DENY_PAT, HOST_ONLY_ALLOW, HOST_ONLY_DENY, HOST_ALLOW_AND_DENY,
                HOST_NO_ALLOW_NO_DENY, true, "Host");
    }

    @Test
    public void testRemoteCIDRValve() {
        standardTests(CIDR_ALLOW_PROP, CIDR_DENY_PROP, CIDR_ONLY_ALLOW, CIDR_ONLY_DENY, CIDR_ALLOW_AND_DENY,
                CIDR_NO_ALLOW_NO_DENY, false, "CIDR");
        standardTests(CIDR_ALLOW_PROP, CIDR_DENY_PROP, CIDR_ONLY_ALLOW, CIDR_ONLY_DENY, CIDR_ALLOW_AND_DENY,
                CIDR_NO_ALLOW_NO_DENY, true, "CIDR");
    }

    @Test
    public void testRemoteCIDR6Valve() {
        standardTests(CIDR6_ALLOW_PROP, CIDR6_DENY_PROP, CIDR6_ONLY_ALLOW, CIDR6_ONLY_DENY, CIDR6_ALLOW_AND_DENY,
                CIDR6_NO_ALLOW_NO_DENY, false, "CIDR");
        standardTests(CIDR6_ALLOW_PROP, CIDR6_DENY_PROP, CIDR6_ONLY_ALLOW, CIDR6_ONLY_DENY, CIDR6_ALLOW_AND_DENY,
                CIDR6_NO_ALLOW_NO_DENY, true, "CIDR");
    }
}
