/*
 *  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.core;

import java.io.IOException;
import java.util.Locale;

import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRequestEvent;
import jakarta.servlet.ServletRequestListener;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

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

import org.apache.catalina.Context;
import org.apache.catalina.connector.Connector;
import org.apache.catalina.connector.Response;
import org.apache.catalina.startup.ExpectationClient;
import org.apache.catalina.startup.Tomcat;
import org.apache.catalina.startup.TomcatBaseTest;
import org.apache.coyote.ContinueResponseTiming;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.descriptor.web.ErrorPage;

public class TestStandardContextValve extends TomcatBaseTest {

    @Test
    public void testBug51653a() throws Exception {
        // Set up a container
        Tomcat tomcat = getTomcatInstance();

        // No file system docBase required
        Context ctx = tomcat.addContext("", null);

        // Traces order of events across multiple components
        StringBuilder trace = new StringBuilder();

        //Add the error page
        Tomcat.addServlet(ctx, "errorPage", new Bug51653ErrorPage(trace));
        ctx.addServletMappingDecoded("/error", "errorPage");
        // And the handling for 404 responses
        ErrorPage errorPage = new ErrorPage();
        errorPage.setErrorCode(Response.SC_NOT_FOUND);
        errorPage.setLocation("/error");
        ctx.addErrorPage(errorPage);

        // Add the request listener
        Bug51653RequestListener reqListener =
            new Bug51653RequestListener(trace);
        ((StandardContext) ctx).addApplicationEventListener(reqListener);

        tomcat.start();

        // Request a page that does not exist
        int rc = getUrl("http://localhost:" + getPort() + "/invalid",
                new ByteChunk(), null);

        // Need to allow time (but not too long in case the test fails) for
        // ServletRequestListener to complete
        int i = 40;
        while (i > 0) {
            if (trace.toString().endsWith("Destroy")) {
                break;
            }
            Thread.sleep(250);
            i--;
        }

        Assert.assertEquals(Response.SC_NOT_FOUND, rc);
        Assert.assertEquals("InitErrorDestroy", trace.toString());
    }


    @Test
    public void testBug51653b() throws Exception {
        // Set up a container
        Tomcat tomcat = getTomcatInstance();

        // No file system docBase required
        Context ctx = tomcat.addContext("", null);

        // Traces order of events across multiple components
        StringBuilder trace = new StringBuilder();

        // Add the page that generates the error
        Tomcat.addServlet(ctx, "test", new Bug51653ErrorTrigger());
        ctx.addServletMappingDecoded("/test", "test");

        // Add the error page
        Tomcat.addServlet(ctx, "errorPage", new Bug51653ErrorPage(trace));
        ctx.addServletMappingDecoded("/error", "errorPage");
        // And the handling for 404 responses
        ErrorPage errorPage = new ErrorPage();
        errorPage.setErrorCode(Response.SC_NOT_FOUND);
        errorPage.setLocation("/error");
        ctx.addErrorPage(errorPage);

        // Add the request listener
        Bug51653RequestListener reqListener =
            new Bug51653RequestListener(trace);
        ((StandardContext) ctx).addApplicationEventListener(reqListener);

        tomcat.start();

        // Request a page that does not exist
        int rc = getUrl("http://localhost:" + getPort() + "/test",
                new ByteChunk(), null);

        // Need to allow time (but not too long in case the test fails) for
        // ServletRequestListener to complete
        int i = 40;
        while (i > 0) {
            if (trace.toString().endsWith("Destroy")) {
                break;
            }
            Thread.sleep(250);
            i--;
        }

        Assert.assertEquals(Response.SC_NOT_FOUND, rc);
        Assert.assertEquals("InitErrorDestroy", trace.toString());
    }


    private static class Bug51653ErrorTrigger extends HttpServlet {
        private static final long serialVersionUID = 1L;

        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp)
                throws ServletException, IOException {
            resp.sendError(Response.SC_NOT_FOUND);
        }
    }


    private static class Bug51653ErrorPage extends HttpServlet {
        private static final long serialVersionUID = 1L;

        private StringBuilder sb;

        Bug51653ErrorPage(StringBuilder sb) {
            this.sb = sb;
        }

        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp)
                throws ServletException, IOException {
            sb.append("Error");

            resp.setContentType("text/plain");
            resp.getWriter().write("Error");
        }
    }


    private static class Bug51653RequestListener
            implements ServletRequestListener {

        private StringBuilder sb;

        Bug51653RequestListener(StringBuilder sb) {
            this.sb = sb;
        }

        @Override
        public void requestInitialized(ServletRequestEvent sre) {
            sb.append("Init");
        }

        @Override
        public void requestDestroyed(ServletRequestEvent sre) {
            sb.append("Destroy");
        }

    }


    @Test
    public void test100ContinueDefault() throws Exception {
        // The default setting is IMMEDIATELY
        // This test verifies that we get proper 100 Continue responses
        // when the continueResponseTiming property is not set
        test100Continue();
    }


    @Test
    public void test100ContinueSentImmediately() throws Exception {
        final Tomcat tomcat = getTomcatInstance();

        final Connector connector = tomcat.getConnector();
        connector.setProperty("continueResponseTiming", "immediately");

        test100Continue();
    }


    @Test
    public void test100ContinueSentOnRequestContentRead() throws Exception {
        final Tomcat tomcat = getTomcatInstance();

        final Connector connector = tomcat.getConnector();
        final String policyString = ContinueResponseTiming.ON_REQUEST_BODY_READ.toString().toLowerCase(Locale.ENGLISH);
        connector.setProperty("continueResponseTiming", policyString);

        test100Continue();
    }


    private void test100Continue() throws Exception {
        // Makes a request that expects a 100 Continue response and verifies
        // that the 100 Continue response is received. This does not check
        // that the correct ContinueResponseTiming was used, just
        // that a 100 Continue response is received. The unit tests for
        // Request verify that the various settings are correctly implemented.

        final Tomcat tomcat = getTomcatInstance();

        // No file system docBase required
        final Context ctx = tomcat.addContext("", null);

        Tomcat.addServlet(ctx, "echo", new EchoBodyServlet());
        ctx.addServletMappingDecoded("/echo", "echo");

        tomcat.start();

        final ExpectationClient client = new ExpectationClient();

        client.setPort(tomcat.getConnector().getLocalPort());
        // Expected content doesn't end with a CR-LF so if it isn't chunked make
        // sure the content length is used as reading it line-by-line will fail
        // since there is no "line".
        client.setUseContentLength(true);

        client.connect();

        client.doRequestHeaders();

        Assert.assertTrue(client.isResponse100());

        client.doRequestBody();
        Assert.assertTrue(client.isResponse200());
        Assert.assertTrue(client.isResponseBodyOK());
    }
}
