codeql/java/ql/test/experimental/query-tests/security/CWE-918/RequestForgery2.java

import java.io.IOException;
import java.net.URI;
import java.net.*;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.Proxy.Type;
import java.io.InputStream;

import org.apache.http.client.methods.HttpGet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class RequestForgery2 extends HttpServlet {
    private static final String VALID_URI = "http://lgtm.com";
    private HttpClient client = HttpClient.newHttpClient();

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {

            String sink = request.getParameter("uri");
            // URI(String str)
            URI uri = new URI(sink);

            // URI(String scheme, String ssp, String fragment)
            URI uri2 = new URI("http", sink, "fragement");

            // URI(String scheme, String userInfo, String host, int port, String path,
            // String query, String fragment)
            URI uri3 = new URI("http", "userinfo", "host", 1, "path", "query", "fragment");
            // URI(String scheme, String host, String path, String fragment)
            URI uri4 = new URI("http", "host", "path", "fragment");
            // URI(String scheme, String authority, String path, String query, String
            // fragment)
            URI uri5 = new URI("http", "authority", "path", "query", "fragment");
            URI uri6 = URI.create("http://foo.com/");

            // URL(String spec)
            URL url1 = new URL(sink);
            // URL(String protocol, String host, int port, String file)
            URL url2 = new URL("http", "host", 1, "file");
            // URL(String protocol, String host, String file)
            URL url3 = new URL("http", "host", "file");
            // URL(URL context, String spec)
            URL url4 = new URL(url3, "http");
            // URL(String protocol, String host, int port, String file, URLStreamHandler
            // handler)
            URL url5 = new URL("http", "host", 1, "file", new Helper2());

            // URL(URL context, String spec, URLStreamHandler handler)
            URL url6 = new URL(url3, "spec", new Helper2());

            URLConnection c1 = url1.openConnection();
            SocketAddress sa = new SocketAddress() {
            };
            URLConnection c2 = url1.openConnection(new Proxy(Type.HTTP, sa));
            InputStream c3 = url1.openStream();

            // java.net.http
            HttpClient client = HttpClient.newHttpClient();
            HttpRequest request2 = HttpRequest.newBuilder().uri(uri2).build();
            HttpRequest request3 = HttpRequest.newBuilder(uri).build();

            // Apache HTTPlib
            HttpGet httpGet = new HttpGet(uri);
            HttpGet httpGet2 = new HttpGet();
            httpGet2.setURI(uri2);
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
}


class Helper2 extends URLStreamHandler {
    Helper2() {
    }

    protected URLConnection openConnection(URL u) throws IOException {
        return null;
    }
}