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| package com.example.demo;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(
name = "welcomeServlet",
value = {"/"}
)
public class welcomeServlet extends HttpServlet {
private static final String DEFAULT_NAME = "guest";
private static final String DEFAULT_WORD = "welcome";
private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
String requestUri = request.getRequestURI();
String contextPath = request.getContextPath();
String pathWithinApp = requestUri.substring(contextPath.length());
if (this.shouldDelegate(pathWithinApp)) {
this.delegateToDefaultResource(pathWithinApp, request, response);
} else {
String jsonPayload = request.getParameter("json");
String nameParam = request.getParameter("name");
String wordParam = request.getParameter("word");
String urlParam = request.getParameter("url");
if (this.isBlank(jsonPayload) && !this.isBlank(nameParam) && !this.isBlank(wordParam)) {
ObjectNode composed = OBJECT_MAPPER.createObjectNode();
composed.put("name", nameParam);
composed.put("word", wordParam);
if (!this.isBlank(urlParam)) {
composed.put("url", urlParam);
}
jsonPayload = composed.toString();
}
if (this.isBlank(jsonPayload)) {
response.sendRedirect(this.defaultRedirectTarget(request));
} else {
try {
User user = (User)OBJECT_MAPPER.readValue(jsonPayload, User.class);
String name = user.getName();
String word = user.getWord();
String url = user.getUrl();
if (this.isBlank(name) || this.isBlank(word)) {
response.sendRedirect(this.defaultRedirectTarget(request));
return;
}
this.renderResponse(response, name, word, url);
} catch (JsonProcessingException var14) {
response.sendError(400, "Invalid JSON payload");
} catch (RuntimeException var15) {
response.sendError(400, "Invalid user data");
}
}
}
}
private boolean shouldDelegate(String pathWithinApp) {
return pathWithinApp != null && !pathWithinApp.isEmpty() && !"/".equals(pathWithinApp);
}
private void delegateToDefaultResource(String pathWithinApp, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
RequestDispatcher defaultDispatcher = this.getServletContext().getNamedDispatcher("default");
if (defaultDispatcher != null) {
defaultDispatcher.forward(request, response);
} else {
request.getRequestDispatcher(pathWithinApp).forward(request, response);
}
}
private void renderResponse(HttpServletResponse response, String name, String word, String url) throws IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
out.println("<html><body>");
String var10001 = this.escapeHtml(name);
out.println("<h1>" + var10001 + "</h1>");
var10001 = this.escapeHtml(word);
out.println("<p>" + var10001 + "</p>");
if (!this.isBlank(url)) {
var10001 = this.escapeHtml(url);
out.println("<p>URL: " + var10001 + "</p>");
}
out.println("</body></html>");
} catch (Throwable var9) {
if (out != null) {
try {
out.close();
} catch (Throwable var8) {
var9.addSuppressed(var8);
}
}
throw var9;
}
if (out != null) {
out.close();
}
}
private String escapeHtml(String input) {
return input == null ? "" : input.replace("&", "&").replace("<", "<").replace(">", ">").replace("\"", """).replace("'", "'");
}
private String defaultRedirectTarget(HttpServletRequest request) {
String var10000 = request.getContextPath();
return var10000 + "/?name=" + this.urlEncode("guest") + "&word=" + this.urlEncode("welcome");
}
private boolean isBlank(String value) {
return value == null || value.trim().isEmpty();
}
private String urlEncode(String value) {
return URLEncoder.encode(value, StandardCharsets.UTF_8);
}
}
|
