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‎assets/EvercookieCacheServlet.java‎

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package evercookie;
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import java.io.IOException;
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import javax.servlet.ServletException;
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import javax.servlet.ServletOutputStream;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.Cookie;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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/**
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* This is a Java Servlet port of evercookie_cache.php, the server-side
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* component of Evercookie's cacheData mechanism.
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*
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* Install this servlet at /evercookie_cache.php in your web.xml (or add a @WebServlet
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* annotation) and you won't even need to modify evercookie.js! This assumes
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* that Evercookie's assets are in your web root.
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*
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* Of course, if you have set $_ec_baseurl to something, you should install this
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* at [$_ec_baseurl]evercookie_cache.php. Remember, $ec_baseurl needs a trailing
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* slash in the evercookie.js.
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*
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* @author Gabriel Bauman <[email protected]>
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*
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*/
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public class EvercookieCacheServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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public EvercookieCacheServlet() {
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super();
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}
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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boolean cookieExists = false;
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String cookieValue = null;
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Cookie[] cookies = req.getCookies();
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if (null != cookies) {
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// Iterate over cookies until we find one named evercookie_cache
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for (Cookie cookie : cookies)
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{
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if (cookie.getName().equals("evercookie_cache")) {
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cookieExists = true;
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cookieValue = cookie.getValue();
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break;
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}
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}
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}
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// If the cookie doesn't exist, send 304 Not Modified and exit.
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if (!cookieExists) {
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resp.setStatus(304);
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return;
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}
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// The cookie was present; set up the response headers.
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resp.setContentType("text/html");
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resp.addHeader("Last-Modified", "Wed, 30 Jun 2010 21:36:48 GMT");
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resp.addHeader("Expires", "Tue, 31 Dec 2030 23:30:45 GMT");
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resp.addHeader("Cache-Control", "private, max-age=630720000");
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// Print the contents of the cookie as the response body.
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ServletOutputStream body = resp.getOutputStream();
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try {
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body.print(cookieValue);
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} finally {
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body.close();
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}
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// And we're done.
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resp.setStatus(200);
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resp.flushBuffer();
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}
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}

‎assets/EvercookieEtagServlet.java‎

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package evercookie;
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import java.io.IOException;
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import javax.servlet.ServletException;
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import javax.servlet.ServletOutputStream;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.Cookie;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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/**
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* This is a Java Servlet port of evercookie_etag.php, the server-side component
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* of Evercookie that uses the If-None-Match and Etag headers to keep track of
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* persistent values.
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*
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* Install this servlet at /evercookie_etag.php in your web.xml (or add a @WebServlet
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* annotation) and you won't even need to modify evercookie.js! This assumes
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* that Evercookie's assets are in your web root.
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*
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* Of course, if you have set $_ec_baseurl to something, you should install this
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* at [$_ec_baseurl]evercookie_etag.php. Remember, $ec_baseurl needs a trailing
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* slash in the evercookie.js.
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*
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* @author Gabriel Bauman <[email protected]>
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*
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*/
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public class EvercookieEtagServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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public EvercookieEtagServlet() {
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super();
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}
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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boolean cookieExists = false;
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String cookieValue = null;
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Cookie[] cookies = req.getCookies();
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if (null != cookies) {
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// Iterate over cookies until we find one named evercookie_etag
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for (Cookie cookie : cookies)
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{
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if (cookie.getName().equals("evercookie_etag")) {
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cookieExists = true;
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cookieValue = cookie.getValue();
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break;
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}
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}
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}
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ServletOutputStream body = resp.getOutputStream();
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try {
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if (cookieExists) {
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// Cookie set; send cookie value as Etag header/response body.
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resp.addHeader("Etag", cookieValue);
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body.print(cookieValue);
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}
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else
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{
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// No cookie; set the body to the request's If-None-Match value.
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body.print(req.getHeader("If-None-Match"));
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}
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} finally {
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// close the output stream.
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body.close();
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}
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resp.setStatus(200);
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}
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}

‎assets/EvercookiePngServlet.java‎

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package evercookie;
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import java.awt.Color;
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import java.awt.RenderingHints;
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import java.awt.image.BufferedImage;
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import java.io.IOException;
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import java.io.OutputStream;
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import javax.imageio.ImageIO;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.Cookie;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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/**
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* This is a Java Servlet port of evercookie_png.php, the server-side component
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* of Evercookie that stores values in force-cached PNG image data.
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*
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* Install this servlet at /evercookie_png.php in your web.xml (or add a @WebServlet
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* annotation) and you won't even need to modify evercookie.js! This assumes
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* that Evercookie's assets are in your web root.
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*
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* Of course, if you have set $_ec_baseurl to something, you should install this
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* at [$_ec_baseurl]evercookie_png.php. Remember, $ec_baseurl needs a trailing
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* slash in the evercookie.js.
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*
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* @author Gabriel Bauman <[email protected]>
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*
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*/
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public class EvercookiePngServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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public EvercookiePngServlet() {
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super();
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}
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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boolean cookieExists = false;
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String cookieValue = null;
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Cookie[] cookies = req.getCookies();
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if (null != cookies) {
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// Iterate over cookies until we find one named evercookie_png
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for (Cookie cookie : cookies)
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{
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if (cookie.getName().equals("evercookie_png")) {
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cookieExists = true;
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cookieValue = cookie.getValue();
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break;
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}
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}
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}
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// If the cookie doesn't exist, send 304 Not Modified and exit.
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if (!cookieExists) {
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resp.setStatus(304);
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return;
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}
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// Generate a PNG image from the cookie value.
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BufferedImage image = new BufferedImage(200, 1, BufferedImage.TYPE_INT_ARGB);
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image.createGraphics().setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
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int x = 0;
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for (int i = 0; i < cookieValue.length(); i += 3) {
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// Treat every 3 chars of the cookie value as an {R,G,B} triplet.
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Color c = new Color(cookieValue.charAt(i), cookieValue.charAt(i + 1), cookieValue.charAt(i + 2));
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image.setRGB(x++, 0, c.getRGB());
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}
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// The cookie was present; set up the response headers.
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resp.setContentType("image/png");
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resp.addHeader("Last-Modified", "Wed, 30 Jun 2010 21:36:48 GMT");
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resp.addHeader("Expires", "Tue, 31 Dec 2033 23:30:45 GMT");
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resp.addHeader("Cache-Control", "private, max-age=630720000");
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// Send the generate image data as the response body.
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OutputStream body = resp.getOutputStream();
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try {
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ImageIO.write(image, "png", body);
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} finally {
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body.close();
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}
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// And we're done.
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resp.setStatus(200);
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resp.flushBuffer();
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}
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}

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