@Test
  public void testEmptyHostmapUseCase() throws Exception {
    URL configUrl = TestUtils.getResourceUrl(this.getClass(), "empty-hostmap.txt");

    UrlRewriteEnvironment environment = EasyMock.createNiceMock(UrlRewriteEnvironment.class);
    EasyMock.expect(environment.getResource("/WEB-INF/hostmap.txt"))
        .andReturn(configUrl)
        .anyTimes();
    Resolver resolver = EasyMock.createNiceMock(Resolver.class);
    EasyMock.expect(resolver.resolve("host"))
        .andReturn(Arrays.asList("test-inbound-host"))
        .anyTimes();
    EasyMock.replay(environment, resolver);

    UrlRewriteRulesDescriptor descriptor = UrlRewriteRulesDescriptorFactory.create();
    UrlRewriteRuleDescriptor rule = descriptor.addRule("test-rule");
    rule.pattern("{*}://{host}:{*}/{**}?{**}");
    UrlRewriteActionRewriteDescriptorExt rewrite = rule.addStep("rewrite");
    rewrite.template("{*}://{$hostmap(host)}:{*}/{**}?{**}");

    UrlRewriteProcessor rewriter = new UrlRewriteProcessor();
    rewriter.initialize(environment, descriptor);

    Template input =
        Parser.parseLiteral(
            "test-scheme://test-inbound-host:42/test-path/test-file?test-name=test-value");
    Template output = rewriter.rewrite(resolver, input, UrlRewriter.Direction.IN, null);
    // System.out.println( output );
    assertThat(output, notNullValue());
    assertThat(output.getHost().getFirstValue().getPattern(), is("test-inbound-host"));
  }
 private String rewriteValue(UrlRewriter rewriter, String value, String rule) {
   try {
     Template input = Parser.parse(value);
     Template output = rewriter.rewrite(this, input, UrlRewriter.Direction.IN, rule);
     value = output.toString();
   } catch (URISyntaxException e) {
     LOG.failedToParseValueForUrlRewrite(value);
   }
   return value;
 }
  @Test
  public void testBasicUseCase() throws Exception {
    URL configUrl = TestUtils.getResourceUrl(this.getClass(), "hostmap.txt");

    HostMapper hm = EasyMock.createNiceMock(HostMapper.class);
    EasyMock.expect(hm.resolveInboundHostName("test-inbound-host"))
        .andReturn("test-inbound-rewritten-host")
        .anyTimes();

    HostMapperService hms = EasyMock.createNiceMock(HostMapperService.class);

    GatewayServices gatewayServices = EasyMock.createNiceMock(GatewayServices.class);
    EasyMock.expect(gatewayServices.getService(GatewayServices.HOST_MAPPING_SERVICE))
        .andReturn(hms)
        .anyTimes();

    UrlRewriteEnvironment environment = EasyMock.createNiceMock(UrlRewriteEnvironment.class);
    EasyMock.expect(environment.getAttribute(GatewayServices.GATEWAY_SERVICES_ATTRIBUTE))
        .andReturn(gatewayServices)
        .anyTimes();
    EasyMock.expect(environment.resolve("cluster.name"))
        .andReturn(Arrays.asList("test-cluster-name"))
        .anyTimes();
    EasyMock.expect(environment.getResource("/WEB-INF/hostmap.txt"))
        .andReturn(configUrl)
        .anyTimes();
    Resolver resolver = EasyMock.createNiceMock(Resolver.class);
    EasyMock.expect(resolver.resolve("host"))
        .andReturn(Arrays.asList("test-inbound-host"))
        .anyTimes();
    EasyMock.replay(gatewayServices, hm, hms, environment, resolver);

    UrlRewriteRulesDescriptor descriptor = UrlRewriteRulesDescriptorFactory.create();
    UrlRewriteRuleDescriptor rule = descriptor.addRule("test-rule");
    rule.pattern("{*}://{host}:{*}/{**}?{**}");
    UrlRewriteActionRewriteDescriptorExt rewrite = rule.addStep("rewrite");
    rewrite.template("{*}://{$hostmap(host)}:{*}/{**}?{**}");

    UrlRewriteProcessor rewriter = new UrlRewriteProcessor();
    rewriter.initialize(environment, descriptor);

    Template input =
        Parser.parseLiteral(
            "test-scheme://test-inbound-host:42/test-path/test-file?test-name=test-value");
    Template output = rewriter.rewrite(resolver, input, UrlRewriter.Direction.IN, null);
    // System.out.println( output );
    assertThat(output, notNullValue());
    assertThat(output.getHost().getFirstValue().getPattern(), is("test-inbound-rewritten-host"));
  }
  @Test
  public void testQueryToPathRewriteWithFunction() throws Exception {
    URL configUrl = TestUtils.getResourceUrl(this.getClass(), "hdfs-hostmap.txt");

    UrlRewriteEnvironment environment = EasyMock.createNiceMock(UrlRewriteEnvironment.class);
    EasyMock.expect(environment.getResource("/WEB-INF/hostmap.txt"))
        .andReturn(configUrl)
        .anyTimes();
    Resolver resolver = EasyMock.createNiceMock(Resolver.class);
    EasyMock.expect(resolver.resolve("host"))
        .andReturn(Arrays.asList("test-internal-host"))
        .anyTimes();
    EasyMock.replay(environment, resolver);

    UrlRewriteRulesDescriptor descriptor = UrlRewriteRulesDescriptorFactory.create();
    UrlRewriteRuleDescriptor rule = descriptor.addRule("test-rule");
    rule.pattern("{*}://{host}:{*}/{**}?{qp1}&{qp2}&{**}");
    UrlRewriteActionRewriteDescriptorExt rewrite = rule.addStep("rewrite");
    rewrite.template("{*}://test-static-host:{*}/{qp1}/{qp2}/{**}?server={$hostmap(host)}&{**}");

    UrlRewriteProcessor rewriter = new UrlRewriteProcessor();
    rewriter.initialize(environment, descriptor);

    Template input =
        Parser.parseLiteral(
            "test-scheme://test-external-host:42/test-path/test-file?qp1=qp1-val&qp2=qp2-val&test-name-1=test-value-1&test-name-2=test-value-2");
    Template output = rewriter.rewrite(resolver, input, UrlRewriter.Direction.OUT, "test-rule");
    // System.out.println( output );
    assertThat(output, notNullValue());
    assertThat(output.getHost().getFirstValue().getPattern(), is("test-static-host"));
    assertThat(
        output.getQuery().get("server").getFirstValue().getPattern(), is("test-external-host"));
    assertThat(output.getQuery().get("server").getValues().size(), is(1));
    assertThat(
        output.getQuery().get("test-name-1").getFirstValue().getPattern(), is("test-value-1"));
    assertThat(output.getQuery().get("test-name-1").getValues().size(), is(1));
    assertThat(
        output.getQuery().get("test-name-2").getFirstValue().getPattern(), is("test-value-2"));
    assertThat(output.getQuery().get("test-name-2").getValues().size(), is(1));
    assertThat(output.getQuery().size(), is(3));
  }
 private String[] splitTargetUrl(Template url) {
   String s = url.toString();
   return s.split("\\?");
 }