Created the ProxyHandler.java

src/main/java/de/gnmyt/mcdash/handler/ProxyHandler.java

@@ -0,0 +1,83 @@
+package de.gnmyt.mcdash.handler;
+
+import com.sun.net.httpserver.HttpExchange;
+import com.sun.net.httpserver.HttpHandler;
+import de.gnmyt.mcdash.MCDashWrapper;
+import de.gnmyt.mcdash.api.Logger;
+import de.gnmyt.mcdash.api.ServerManager;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.RequestBody;
+import okhttp3.Response;
+import org.apache.commons.io.IOUtils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+
+public class ProxyHandler implements HttpHandler {
+
+    private final static Logger LOG = new Logger(ProxyHandler.class);
+    private final OkHttpClient client = new OkHttpClient();
+    private final ServerManager serverManager = MCDashWrapper.getServerManager();
+
+    @Override
+    public void handle(HttpExchange exchange) throws IOException {
+        String uuid = exchange.getRequestURI().getPath().split("/")[2];
+
+        if (serverManager.getServer(uuid) == null) {
+            exchange.sendResponseHeaders(404, 0);
+            exchange.close();
+            return;
+        }
+
+        String pathWithoutUuid = exchange.getRequestURI().getPath().replace("/proxy/" + uuid, "")
+                        + (exchange.getRequestURI().getQuery() != null ? "?" + exchange.getRequestURI().getQuery() : "");
+
+        RequestBody requestBody = exchange.getRequestMethod().equals("GET") ? null : RequestBody.create(IOUtils.toByteArray(exchange.getRequestBody()), null);
+
+        Request request = new Request.Builder()
+                .url("http://localhost:" + serverManager.getServer(uuid).getDashPort() + pathWithoutUuid)
+                .method(exchange.getRequestMethod(), requestBody)
+                .header("User-Agent", "MCDash-Wrapper")
+                .header("Authorization", "Basic Q09OU09MRTp0ZXN0MTIz")
+                .build();
+
+        try (Response response = client.newCall(request).execute()) {
+            response.headers().toMultimap().forEach((key, value) -> exchange.getResponseHeaders().put(key, value));
+
+            exchange.sendResponseHeaders(response.code(), 0);
+
+            if (pathWithoutUuid.endsWith(".js") || pathWithoutUuid.endsWith(".css") || !pathWithoutUuid.contains(".")) {
+                String htmlContent = response.body().string();
+                htmlContent = modifyContent(htmlContent, uuid);
+
+                try (OutputStream os = exchange.getResponseBody()) {
+                    os.write(htmlContent.getBytes(StandardCharsets.UTF_8));
+                }
+            } else {
+                try (InputStream is = response.body().byteStream(); OutputStream os = exchange.getResponseBody()) {
+                    IOUtils.copy(is, os);
+                }
+            }
+
+        } catch (IOException e) {
+            LOG.error("An error occurred while proxying the request: {}", e.getMessage());
+            exchange.sendResponseHeaders(500, 0);
+        } finally {
+            exchange.close();
+        }
+    }
+
+    private String modifyContent(String htmlContent, String uuid) {
+        htmlContent = htmlContent.replaceAll("/assets/", "/proxy/" + uuid + "/assets/");
+        htmlContent = htmlContent.replaceAll("/api/", "/proxy/" + uuid + "/api/");
+        htmlContent = htmlContent.replaceAll("t\\(\"/files\"", "t(\"/proxy/" + uuid + "/files\"");
+        htmlContent = htmlContent.replaceAll("r.pathname===\"/\"", "r.pathname===\"/proxy/" + uuid + "/\"");
+        htmlContent = htmlContent.replaceAll("a=>a===\"/\"", "a=>a===\"/proxy/" + uuid + "/\"");
+
+        htmlContent = htmlContent.replaceAll("path:\"/", "path: \"/proxy/" + uuid + "/");
+        return htmlContent;
+    }
+}