public void doGet()

in appengine-java8/gaeinfo/src/main/java/com/example/appengine/standard/GaeInfoServlet.java [136:225]
70 lines of code
12 McCabe index (conditional complexity)

  public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
    String key = "";
    final AppIdentityService appIdentity = AppIdentityServiceFactory.getAppIdentityService();
    WebContext ctx = new WebContext(application.buildExchange(req, resp));
    ctx.setLocale(req.getLocale());

    resp.setContentType("text/html");

    ctx.setVariable("production", SystemProperty.environment.value().name());
    ctx.setVariable("ServiceAccountName", appIdentity.getServiceAccountName());
    ctx.setVariable("gcs", appIdentity.getDefaultGcsBucketName());

    ctx.setVariable("appId", SystemProperty.applicationId.get());
    ctx.setVariable("appVer", SystemProperty.applicationVersion.get());
    ctx.setVariable("version", SystemProperty.version.get());
    ctx.setVariable("environment", SystemProperty.environment.get());

    // Environment Atributes
    ApiProxy.Environment env = ApiProxy.getCurrentEnvironment();
    Map<String, Object> attr = env.getAttributes();
    TreeMap<String, String> m = new TreeMap<>();

    for (String k : attr.keySet()) {
      Object o = attr.get(k);

      if (o.getClass().getCanonicalName().equals("java.lang.String")) {
        m.put(k, (String) o);
      } else if (o.getClass().getCanonicalName().equals("java.lang.Boolean")) {
        m.put(k, ((Boolean) o).toString());
      } else {
        m.put(k, "a " + o.getClass().getCanonicalName());
      }
    }
    ctx.setVariable("attribs", m);

    m = new TreeMap<>();
    for (Enumeration<String> e = req.getHeaderNames(); e.hasMoreElements(); ) {
      key = e.nextElement();
      m.put(key, req.getHeader(key));
    }
    ctx.setVariable("headers", m);

    Cookie[] cookies = req.getCookies();
    m = new TreeMap<>();
    if (cookies != null && cookies.length != 0) {
      for (Cookie co : cookies) {
        m.put(co.getName(), co.getValue());
      }
    }
    ctx.setVariable("cookies", m);

    Properties properties = System.getProperties();
    m = new TreeMap<>();
    for (Enumeration<?> e = properties.propertyNames(); e.hasMoreElements(); ) {
      key = (String) e.nextElement();
      m.put(key, (String) properties.get(key));
    }
    ctx.setVariable("systemprops", m);

    Map<String, String> envVar = System.getenv();
    m = new TreeMap<>(envVar);
    ctx.setVariable("envvar", m);

    // The metadata server is only on a production system
    if (SystemProperty.environment.value() == SystemProperty.Environment.Value.Production) {

      m = new TreeMap<>();
      for (String k : metaPath) {
        m.put(k, fetchMetadata(k));
      }
      ctx.setVariable("Metadata", m.descendingMap());

      m = new TreeMap<>();
      for (String k : metaServiceAcct) {
        // substitute a service account for {account}
        k = k.replace("{account}", appIdentity.getServiceAccountName());
        m.put(k, fetchMetadata(k));
      }
      ctx.setVariable("sam", m.descendingMap());

      // Recursively get all info about service accounts -- Note tokens are leftout by default.
      ctx.setVariable(
          "rsa",
          fetchJsonMetadata("/computeMetadata/v1/instance/service-accounts/?recursive=true"));
      // Recursively get all data on Metadata server.
      ctx.setVariable("ram", fetchJsonMetadata("/?recursive=true"));
    }

    templateEngine.process("index", ctx, resp.getWriter());
  }