add mojang api status endpoint

src/main/java/cc/fascinated/Main.java

@@ -16,7 +16,6 @@ import java.util.Objects;
 @Log4j2
 @SpringBootApplication
 public class Main {
-
     public static final Gson GSON = new GsonBuilder()
             .setDateFormat("MM-dd-yyyy HH:mm:ss")
             .create();

src/main/java/cc/fascinated/common/EndpointStatus.java

@@ -0,0 +1,22 @@
+package cc.fascinated.common;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.HttpStatusCode;
+
+import java.util.List;
+
+@AllArgsConstructor @Getter
+public class EndpointStatus {
+
+    /**
+     * The endpoint.
+     */
+    private final String endpoint;
+
+    /**
+     * The statuses that indicate that the endpoint is online.
+     */
+    private final List<HttpStatusCode> allowedStatuses;
+}

src/main/java/cc/fascinated/common/WebRequest.java

@@ -3,9 +3,9 @@ package cc.fascinated.common;
 import cc.fascinated.exception.impl.RateLimitException;
 import lombok.experimental.UtilityClass;
 import org.springframework.http.HttpStatus;
+import org.springframework.http.HttpStatusCode;
 import org.springframework.http.ResponseEntity;
 import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
-import org.springframework.web.client.HttpClientErrorException;
 import org.springframework.web.client.RestClient;
 
 @UtilityClass
@@ -14,9 +14,15 @@ public class WebRequest {
     /**
      * The web client.
      */
-    private static final RestClient CLIENT = RestClient.builder()
-            .requestFactory(new HttpComponentsClientHttpRequestFactory())
-            .build();
+    private static final RestClient CLIENT;
+
+    static {
+        HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
+        requestFactory.setConnectTimeout(5000); // 5 seconds
+        CLIENT = RestClient.builder()
+                .requestFactory(requestFactory)
+                .build();
+    }
 
     /**
      * Gets a response from the given URL.
@@ -26,21 +32,31 @@ public class WebRequest {
      * @param <T> the type of the response
      */
     public static <T> T getAsEntity(String url, Class<T> clazz) throws RateLimitException {
-        try {
-            ResponseEntity<T> profile = CLIENT.get()
-                    .uri(url)
-                    .retrieve()
-                    .toEntity(clazz);
+        ResponseEntity<T> profile = CLIENT.get()
+                .uri(url)
+                .retrieve()
+                .toEntity(clazz);
 
-            if (profile.getStatusCode().isError()) {
-                return null;
-            }
-            if (profile.getStatusCode().isSameCodeAs(HttpStatus.TOO_MANY_REQUESTS)) {
-                throw new RateLimitException("Rate limit reached");
-            }
-            return profile.getBody();
-        } catch (HttpClientErrorException ex) {
+        if (profile.getStatusCode().isError()) {
             return null;
         }
+        if (profile.getStatusCode().isSameCodeAs(HttpStatus.TOO_MANY_REQUESTS)) {
+            throw new RateLimitException("Rate limit reached");
+        }
+        return profile.getBody();
+    }
+
+    /**
+     * Gets a response from the given URL.
+     *
+     * @param url the url
+     * @return the response
+     */
+    public static ResponseEntity<?> getAndIgnoreErrors(String url) {
+        return CLIENT.get()
+                .uri(url)
+                .retrieve()
+                .onStatus(HttpStatusCode::isError, (request, response) -> {}) // Don't throw exceptions on error
+                .toEntity(String.class);
     }
 }

src/main/java/cc/fascinated/controller/HomeController.java

@@ -19,6 +19,7 @@ public class HomeController {
     public String home(Model model) {
         model.addAttribute("player_example_url", Config.INSTANCE.getWebPublicUrl() + "/player/" + exampleUuid);
         model.addAttribute("java_server_example_url", Config.INSTANCE.getWebPublicUrl() + "/server/java/" + exampleServer);
+        model.addAttribute("mojang_endpoint_status_url", Config.INSTANCE.getWebPublicUrl() + "/mojang/status");
         model.addAttribute("swagger_url", Config.INSTANCE.getWebPublicUrl() + "/swagger-ui.html");
         return "index";
     }

src/main/java/cc/fascinated/controller/MojangController.java

@@ -0,0 +1,23 @@
+package cc.fascinated.controller;
+
+import cc.fascinated.model.cache.CachedEndpointStatus;
+import cc.fascinated.service.MojangService;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@Tag(name = "Mojang Controller", description = "The Mojang Controller is used to get information about the Mojang APIs.")
+@RequestMapping(value = "/mojang/", produces = MediaType.APPLICATION_JSON_VALUE)
+public class MojangController {
+
+    @Autowired
+    private MojangService mojangService;
+
+    @RequestMapping(value = "/status")
+    public CachedEndpointStatus getStatus() {
+        return mojangService.getMojangApiStatus();
+    }
+}

src/main/java/cc/fascinated/exception/impl/InternalServerErrorException.java

@@ -0,0 +1,12 @@
+package cc.fascinated.exception.impl;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
+public class InternalServerErrorException extends RuntimeException {
+
+    public InternalServerErrorException(String message) {
+        super(message);
+    }
+}

src/main/java/cc/fascinated/model/cache/CachedEndpointStatus.java

@@ -0,0 +1,31 @@
+package cc.fascinated.model.cache;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import lombok.*;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.redis.core.RedisHash;
+
+import java.io.Serializable;
+import java.util.Map;
+
+@AllArgsConstructor @Setter @Getter @ToString
+@RedisHash(value = "mojangEndpointStatus", timeToLive = 60L) // 1 minute (in seconds)
+public final class CachedEndpointStatus implements Serializable {
+
+    /**
+     * The id for this endpoint cache.
+     */
+    @Id @NonNull @JsonIgnore
+    private final String id;
+
+    /**
+     * The list of endpoints and their status.
+     */
+    private final Map<String, Boolean> endpoints;
+
+    /**
+     * The unix timestamp of when this
+     * server was cached, -1 if not cached.
+     */
+    private long cached;
+}

src/main/java/cc/fascinated/repository/EndpointStatusRepository.java

@@ -0,0 +1,11 @@
+package cc.fascinated.repository;
+
+import cc.fascinated.model.cache.CachedEndpointStatus;
+import org.springframework.data.repository.CrudRepository;
+
+/**
+ * A cache repository for the Mojang endpoint status.
+ *
+ * @author Braydon
+ */
+public interface EndpointStatusRepository extends CrudRepository<CachedEndpointStatus, String> { }

src/main/java/cc/fascinated/service/MojangService.java

@@ -1,17 +1,25 @@
 package cc.fascinated.service;
 
+import cc.fascinated.common.EndpointStatus;
 import cc.fascinated.common.ExpiringSet;
 import cc.fascinated.common.WebRequest;
+import cc.fascinated.config.Config;
+import cc.fascinated.model.cache.CachedEndpointStatus;
 import cc.fascinated.model.mojang.MojangProfile;
 import cc.fascinated.model.mojang.MojangUsernameToUuid;
+import cc.fascinated.repository.EndpointStatusRepository;
 import com.google.common.base.Joiner;
 import com.google.common.base.Splitter;
 import com.google.common.collect.Lists;
 import com.google.common.hash.Hashing;
 import io.micrometer.common.lang.NonNull;
+import lombok.Getter;
 import lombok.SneakyThrows;
 import lombok.extern.log4j.Log4j2;
 import net.jodah.expiringmap.ExpirationPolicy;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Service;
 
 import java.io.InputStream;
@@ -20,16 +28,40 @@ import java.nio.charset.StandardCharsets;
 import java.util.*;
 import java.util.concurrent.TimeUnit;
 
-@Service @Log4j2
+@Service @Log4j2 @Getter
 public class MojangService {
 
+    /**
+     * The splitter and joiner for dots.
+     */
+    private static final Splitter DOT_SPLITTER = Splitter.on('.');
+    private static final Joiner DOT_JOINER = Joiner.on('.');
+
+    /**
+     * The Mojang API endpoints.
+     */
     private static final String SESSION_SERVER_ENDPOINT = "https://sessionserver.mojang.com";
     private static final String API_ENDPOINT = "https://api.mojang.com";
     private static final String FETCH_BLOCKED_SERVERS = SESSION_SERVER_ENDPOINT + "/blockedservers";
-    private static final Splitter DOT_SPLITTER = Splitter.on('.');
-    private static final Joiner DOT_JOINER = Joiner.on('.');
+
+    /**
+     * The interval to fetch the blocked servers from Mojang.
+     */
     private static final long FETCH_BLOCKED_SERVERS_INTERVAL = TimeUnit.HOURS.toMillis(1L);
 
+    /**
+     * Information about the Mojang API endpoints.
+     */
+    private static final String MOJANG_ENDPOINT_STATUS_KEY = "mojang";
+    private static final List<EndpointStatus> MOJANG_ENDPOINTS = List.of(
+            new EndpointStatus("https://textures.minecraft.net", List.of(HttpStatus.BAD_REQUEST)),
+            new EndpointStatus(API_ENDPOINT, List.of(HttpStatus.OK)),
+            new EndpointStatus(SESSION_SERVER_ENDPOINT, List.of(HttpStatus.FORBIDDEN))
+    );
+
+    @Autowired
+    private EndpointStatusRepository mojangEndpointStatusRepository;
+
     /**
      * A list of banned server hashes provided by Mojang.
      * <p>
@@ -62,6 +94,7 @@ public class MojangService {
      */
     @SneakyThrows
     private void fetchBlockedServers() {
+        log.info("Fetching blocked servers from Mojang");
         try (
                 InputStream inputStream = new URL(FETCH_BLOCKED_SERVERS).openStream();
                 Scanner scanner = new Scanner(inputStream, StandardCharsets.UTF_8).useDelimiter("\n");
@@ -142,6 +175,41 @@ public class MojangService {
         return blocked;
     }
 
+    /**
+     * Gets the status of the Mojang API.
+     *
+     * @return the status of the Mojang API
+     */
+    public CachedEndpointStatus getMojangApiStatus() {
+        log.info("Getting Mojang API status");
+        Optional<CachedEndpointStatus> endpointStatus = mojangEndpointStatusRepository.findById(MOJANG_ENDPOINT_STATUS_KEY);
+        if (endpointStatus.isPresent() && Config.INSTANCE.isProduction()) {
+            log.info("Got cached Mojang API status");
+            return endpointStatus.get();
+        }
+
+        // Fetch the status of the Mojang APIs
+        Map<String, Boolean> endpoints = new HashMap<>();
+        for (EndpointStatus endpoint : MOJANG_ENDPOINTS) {
+            boolean online = false;
+            ResponseEntity<?> response = WebRequest.getAndIgnoreErrors(endpoint.getEndpoint());
+            if (endpoint.getAllowedStatuses().contains(response.getStatusCode())) {
+                online = true;
+            }
+            endpoints.put(endpoint.getEndpoint(), online);
+        }
+        log.info("Fetched Mojang API status for {} endpoints", endpoints.size());
+
+        CachedEndpointStatus status = new CachedEndpointStatus(
+                MOJANG_ENDPOINT_STATUS_KEY,
+                endpoints,
+                System.currentTimeMillis()
+        );
+        mojangEndpointStatusRepository.save(status);
+        status.setCached(-1L); // Indicate that the status is not cached
+        return status;
+    }
+
     /**
      * Gets the Session Server profile of the
      * player with the given UUID.

src/main/resources/templates/index.html

@@ -22,6 +22,7 @@
     <div class="flex flex-col mt-3">
         <p>Player Data: <a class="text-blue-600" target=”_blank” th:href="${player_example_url}" th:text="${player_example_url}">???</a></p>
         <p>Server Data: <a class="text-blue-600" target=”_blank” th:href="${java_server_example_url}" th:text="${java_server_example_url}">???</a></p>
+        <p>Mojang Endpoint Status: <a class="text-blue-600" target=”_blank” th:href="${mojang_endpoint_status_url}" th:text="${mojang_endpoint_status_url}">???</a></p>
         <p>Swagger Docs: <a class="text-blue-600" target=”_blank” th:href="${swagger_url}" th:text="${swagger_url}">???</a></p>
     </div>
 </body>