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src/main/java/tech/nevets/rickrollprot/CheckRoute.java

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+package tech.nevets.rickrollprot;
+
+import spark.Request;
+import spark.Response;
+import spark.Route;
+
+import java.net.URI;
+import java.net.URLDecoder;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.nio.charset.StandardCharsets;
+
+public class CheckRoute implements Route {
+    // Route: "/api/check/:link"
+    @Override
+    public Object handle(Request req, Response res) throws Exception {
+        boolean isRickRoll = false;
+        String link = URLDecoder.decode(req.params("link"), StandardCharsets.UTF_8);
+        String response = makeGetRequest(link);
+        if (response == null) {
+            res.status(400);
+            return "Invalid Link";
+        }
+        if (response.matches("(?i)never.*?gonna.*?Give.*?You.*?Up")
+                || response.matches("(?i)rick.*?astley")
+                || response.matches("(?i)rick.*?roll")
+                || response.contains("nggyu")) {
+            isRickRoll = true;
+        }
+        return "{\"isRickRoll\":" + isRickRoll + "}";
+    }
+
+    private static String makeGetRequest(String link) {
+        try {
+            HttpClient client = HttpClient.newHttpClient();
+            HttpRequest request = HttpRequest.newBuilder()
+                    .GET()
+                    .uri(new URI(link))
+                    .build();
+            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+            if (response.headers().firstValue("Location").isPresent()) {
+                return makeGetRequest(response.headers().firstValue("Location").get());
+            }
+            return response.body();
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+}

src/main/java/tech/nevets/rickrollprot/Server.java

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+package tech.nevets.rickrollprot;
+
+import static spark.Spark.*;
+
+public class Server {
+    public static void main(String[] args) {
+        port(8080);
+
+        get("/api/check/:link", new CheckRoute());
+    }
+}