public static void sendRedirect()

in src/main/java/org/apache/sling/auth/core/AuthUtil.java [423:472]
42 lines of code
11 McCabe index (conditional complexity)

    public static void sendRedirect(
            final javax.servlet.http.HttpServletRequest request,
            final javax.servlet.http.HttpServletResponse response,
            final String target,
            Map<String, String> params)
            throws IOException {

        checkAndReset(response);

        StringBuilder b = new StringBuilder();
        if (AuthUtil.isRedirectValid(request, target)) {
            b.append(target);
        } else if (request.getContextPath().length() == 0) {
            b.append("/");
        } else {
            b.append(request.getContextPath());
        }

        if (params == null) {
            params = new HashMap<>();
        }

        // ensure the login resource is provided with the redirect
        if (params.get(Authenticator.LOGIN_RESOURCE) == null) {
            String resource = request.getRequestURI();
            if (request.getQueryString() != null) {
                resource += "?" + request.getQueryString();
            }
            params.put(Authenticator.LOGIN_RESOURCE, resource);
        }

        b.append('?');
        Iterator<Entry<String, String>> ei = params.entrySet().iterator();
        while (ei.hasNext()) {
            Entry<String, String> entry = ei.next();
            if (entry.getKey() != null && entry.getValue() != null) {
                try {
                    b.append(entry.getKey()).append('=').append(URLEncoder.encode(entry.getValue(), "UTF-8"));
                } catch (UnsupportedEncodingException uee) {
                    throw new InternalError("Unexpected UnsupportedEncodingException for UTF-8");
                }

                if (ei.hasNext()) {
                    b.append('&');
                }
            }
        }

        response.sendRedirect(b.toString());
    }