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java
a month ago
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import java.util.*;
import java.util.regex.*;

public class IPValidator {

    public static List<Integer> validateRequests(List<String> blacklistedIps, List<String> requests) {
        List<Integer> results = new ArrayList<>();
        Map<String, Queue<Integer>> requestTimes = new HashMap<>();

        for (String req : requests) {
            boolean isBlocked = false;
            for (String bip : blacklistedIps) {
                if (ipMatches(req, bip)) {
                    // Check for the number of allowed requests in the last 5 seconds
                    Queue<Integer> times = requestTimes.getOrDefault(req, new LinkedList<>());
                    while (!times.isEmpty() && times.peek() <= Integer.parseInt(req.split(",")[0]) - 5) {
                        times.poll();
                    }
                    if (times.size() >= 2) {
                        isBlocked = true;
                    }
                    times.offer(Integer.parseInt(req.split(",")[0]));
                    requestTimes.put(req.split(",")[1], times);
                    break;
                }
            }
            results.add(isBlocked ? 1 : 0);
        }

        return results;
    }

    private static boolean ipMatches(String request, String blacklistedIp) {
        String[] reqParts = request.split(",")[1].split("\\.");
        String[] bipParts = blacklistedIp.split("\\.");
        for (int i = 0; i < bipParts.length; i++) {
            if (!bipParts[i].equals("*") && !bipParts[i].equals(reqParts[i])) {
                return false;
            }
        }
        return true;
    }

    public static void main(String[] args) {
        List<String> blacklistedIps = Arrays.asList("111.*.255", "12.*");
        List<String> requests = Arrays.asList("1,121.3.5.255", "2,12.13.5.255", "3,111.3.5.255", "4,121.3.5.255");

        List<Integer> results = validateRequests(blacklistedIps, requests);
        for (int result : results) {
            System.out.println(result);
        }
    }
}
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