Add ClassiCube API-related classes

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/ClassiCubeAccountHandler.java

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+package de.florianmichael.viafabricplus.definition.c0_30.classicube;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.auth.ClassiCubeAccount;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.auth.process.ILoginProcessHandler;
+import de.florianmichael.viafabricplus.util.FileSaver;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.security.auth.login.LoginException;
+import java.util.Map;
+
+public class ClassiCubeAccountHandler extends FileSaver implements ILoginProcessHandler {
+    public final static Logger LOGGER = LoggerFactory.getLogger("ViaFabricPlus/ClassiCube Account Handler");
+    public static ClassiCubeAccountHandler INSTANCE;
+    private ClassiCubeAccount account;
+
+    public ClassiCubeAccountHandler() {
+        super("classicube.account");
+    }
+
+    public static void create() {
+        ClassiCubeAccountHandler.INSTANCE = new ClassiCubeAccountHandler();
+        ClassiCubeAccountHandler.INSTANCE.init();
+    }
+
+    @Override
+    public void write(JsonObject object) {
+        for (Map.Entry<String, JsonElement> entry : account.toJson().entrySet()) {
+            object.add(entry.getKey(), entry.getValue());
+        }
+    }
+
+    @Override
+    public void read(JsonObject object) {
+        try {
+            account = ClassiCubeAccount.fromJson(object);
+            account.login(this);
+        } catch (LoginException e) {
+            LOGGER.error("Failed to log into ClassiCube account!", e);
+        }
+    }
+
+    @Override
+    public void handleMfa(ClassiCubeAccount account) {
+        LOGGER.error("Failed to log into ClassiCube account due to MFA request.");
+    }
+
+    @Override
+    public void handleSuccessfulLogin(ClassiCubeAccount account) {
+        LOGGER.info("Successfully logged into ClassiCube!");
+    }
+
+    public ClassiCubeAccount getAccountClone() {
+        return new ClassiCubeAccount(account.token, account.username, account.password);
+    }
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/auth/ClassiCubeAccount.java

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+package de.florianmichael.viafabricplus.definition.c0_30.classicube.auth;
+
+import com.google.gson.JsonObject;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.auth.process.ILoginProcessHandler;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.request.auth.ClassiCubeAuthenticationLoginRequest;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.request.auth.ClassiCubeAuthenticationTokenRequest;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.response.auth.ClassiCubeAuthenticationResponse;
+
+import javax.security.auth.login.LoginException;
+
+public class ClassiCubeAccount {
+    public String token;
+    public String username;
+    public String password;
+
+    public ClassiCubeAccount(String username, String password) {
+        this.username = username;
+        this.password = password;
+    }
+
+    public ClassiCubeAccount(String token, String username, String password) {
+        this(username, password);
+        this.token = token;
+    }
+
+    public JsonObject toJson() {
+        final JsonObject object = new JsonObject();
+
+        object.addProperty("token", this.token);
+        object.addProperty("username", this.username);
+        object.addProperty("password", this.password);
+
+        return object;
+    }
+
+    public static ClassiCubeAccount fromJson(JsonObject jsonObject) {
+        final String token = jsonObject.getAsString();
+        final String username = jsonObject.getAsString();
+        final String password = jsonObject.getAsString();
+
+        return new ClassiCubeAccount(token, username, password);
+    }
+
+    public void login(ILoginProcessHandler processHandler) throws LoginException {
+        final ClassiCubeAuthenticationTokenRequest initialTokenRequest = new ClassiCubeAuthenticationTokenRequest();
+        final ClassiCubeAuthenticationResponse initialTokenResponse = initialTokenRequest.send()
+                .join();
+
+        // There should NEVER be any errors on the initial token response!
+        if (initialTokenResponse.shouldError()) {
+            final String errorDisplay = initialTokenResponse.getErrorDisplay();
+
+            throw new LoginException(errorDisplay);
+        }
+
+        final ClassiCubeAuthenticationLoginRequest loginRequest = new ClassiCubeAuthenticationLoginRequest(initialTokenResponse, this.username, this.password);
+        final ClassiCubeAuthenticationResponse loginResponse = loginRequest.send()
+                .join();
+
+        if (loginResponse.shouldError()) {
+            final String errorDisplay = loginResponse.getErrorDisplay();
+
+            throw new LoginException(errorDisplay);
+        }
+
+        this.token = loginResponse.token;
+
+        if (initialTokenResponse.mfaRequired()) {
+            processHandler.handleMfa(this);
+            return;
+        }
+
+        processHandler.handleSuccessfulLogin(this);
+    }
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/auth/ClassiCubeAuthenticationData.java

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+package de.florianmichael.viafabricplus.definition.c0_30.classicube.auth;
+
+import javax.annotation.Nullable;
+
+/**
+ * Contains the authentication data that will be used in the URL parameters of the /api/login request.
+ * Taken from <a href="https://www.classicube.net/api/">the official ClassiCube API documentation</a>
+ */
+public class ClassiCubeAuthenticationData {
+    private final String username;
+    private final String password;
+    private final String previousToken;
+    @Nullable private final String loginCode;
+
+    public ClassiCubeAuthenticationData(String username, String password, String previousToken) {
+        this(username, password, previousToken, null);
+    }
+
+    public ClassiCubeAuthenticationData(String username, String password, String previousToken, @Nullable String loginCode) {
+        this.username = username;
+        this.password = password;
+        this.previousToken = previousToken;
+        this.loginCode = loginCode;
+    }
+
+    public ClassiCubeAuthenticationData getWithLoginToken(final String loginCode) {
+        return new ClassiCubeAuthenticationData(this.username, this.password, this.previousToken, loginCode);
+    }
+
+    public String getRequestBody() {
+        final StringBuilder builder = new StringBuilder("username=")
+                .append(username);
+
+        builder.append("&password=");
+        builder.append(password);
+        builder.append("&token=");
+        builder.append(previousToken);
+
+        if (loginCode != null) {
+            builder.append("&login_code=");
+            builder.append(loginCode);
+        }
+
+        return builder.toString();
+    }
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/auth/ClassiCubeError.java

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+package de.florianmichael.viafabricplus.definition.c0_30.classicube.auth;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParseException;
+
+import java.lang.reflect.Type;
+import java.util.Arrays;
+
+public enum ClassiCubeError implements JsonDeserializer<ClassiCubeError> {
+    TOKEN("Incorrect token. Is your ViaFabricPlus out of date?"),
+    USERNAME("Invalid username."),
+    PASSWORD("Invalid password."),
+    VERIFICATION("User hasn't verified their E-mail address yet.", false),
+    LOGIN_CODE("Multi-factor authentication requested. Please check your E-mail.");
+
+    public final String description;
+    public final boolean fatal;
+
+    ClassiCubeError(String description) {
+        this(description, true);
+    }
+
+    ClassiCubeError(String description, boolean fatal) {
+        this.description = description;
+        this.fatal = fatal;
+    }
+
+    @Override
+    public ClassiCubeError deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
+        return Arrays.stream(ClassiCubeError.values())
+                .filter(e -> e.name().toLowerCase().equals(json.getAsString()))
+                .findFirst()
+                .orElse(null);
+    }
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/auth/process/ILoginProcessHandler.java

@@ -0,0 +1,8 @@
+package de.florianmichael.viafabricplus.definition.c0_30.classicube.auth.process;
+
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.auth.ClassiCubeAccount;
+
+public interface ILoginProcessHandler {
+    void handleMfa(final ClassiCubeAccount account);
+    void handleSuccessfulLogin(final ClassiCubeAccount account);
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/data/ClassiCubeServerInfo.java

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+package de.florianmichael.viafabricplus.definition.c0_30.classicube.data;
+
+import com.google.gson.annotations.SerializedName;
+
+public class ClassiCubeServerInfo {
+    public final String hash;
+    public final int maxplayers;
+    public final String name;
+    public final int players;
+    public final String software;
+    public final long uptime;
+    @SerializedName("country_abbr")
+    public final String countryCode;
+    public final boolean web;
+    public final boolean featured;
+    public final String ip;
+    public final int port;
+    public final String mppass;
+
+    public ClassiCubeServerInfo(String hash, int maxplayers, String name, int players, String software, long uptime, String countryCode, boolean web, boolean featured, String ip, int port, String mppass) {
+        this.hash = hash;
+        this.maxplayers = maxplayers;
+        this.name = name;
+        this.players = players;
+        this.software = software;
+        this.uptime = uptime;
+        this.countryCode = countryCode;
+        this.web = web;
+        this.featured = featured;
+        this.ip = ip;
+        this.port = port;
+        this.mppass = mppass;
+    }
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/request/ClassiCubeRequest.java

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+package de.florianmichael.viafabricplus.definition.c0_30.classicube.request;
+
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.ClassiCubeAccountHandler;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.auth.ClassiCubeAccount;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+
+public abstract class ClassiCubeRequest {
+
+    private final static URI CLASSICUBE_ROOT_URI = URI.create("https://www.classicube.net");
+    protected final static URI AUTHENTICATION_URI = CLASSICUBE_ROOT_URI.resolve("/api/login/");
+    protected final static URI SERVER_INFO_URI = CLASSICUBE_ROOT_URI.resolve("/api/server/");
+    protected final static URI SERVER_LIST_INFO_URI = CLASSICUBE_ROOT_URI.resolve("/api/servers/");
+    protected final static HttpClient HTTP_CLIENT = HttpClient.newHttpClient();
+
+    public HttpRequest buildWithTokenHeader(final HttpRequest.Builder builder) {
+        final ClassiCubeAccountHandler accountHandler = ClassiCubeAccountHandler.INSTANCE;
+        final ClassiCubeAccount account = accountHandler.getAccountClone();
+
+        builder.header("Cookie", "session=" + account.token);
+
+        return builder.build();
+    }
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/request/auth/ClassiCubeAuthenticationLoginRequest.java

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+package de.florianmichael.viafabricplus.definition.c0_30.classicube.request.auth;
+
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.auth.ClassiCubeAuthenticationData;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.request.ClassiCubeRequest;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.response.auth.ClassiCubeAuthenticationResponse;
+
+import javax.annotation.Nullable;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.concurrent.CompletableFuture;
+
+public class ClassiCubeAuthenticationLoginRequest extends ClassiCubeAuthenticationRequest {
+    private final ClassiCubeAuthenticationData authenticationData;
+
+    public ClassiCubeAuthenticationLoginRequest(ClassiCubeAuthenticationResponse previousResponse, String username, String password) {
+        this(previousResponse, username, password, null);
+    }
+
+    public ClassiCubeAuthenticationLoginRequest(ClassiCubeAuthenticationResponse previousResponse, String username, String password, @Nullable String loginCode) {
+        this.authenticationData = new ClassiCubeAuthenticationData(username, password, previousResponse.token, loginCode);
+    }
+
+    @Override
+    public CompletableFuture<ClassiCubeAuthenticationResponse> send() {
+        return CompletableFuture.supplyAsync(() -> {
+            final String requestBody = authenticationData.getRequestBody();
+            final HttpRequest request = HttpRequest.newBuilder()
+                    .POST(HttpRequest.BodyPublishers.ofString(requestBody))
+                    .uri(ClassiCubeRequest.AUTHENTICATION_URI)
+                    .build();
+
+            final HttpResponse<String> response = HTTP_CLIENT.sendAsync(request, HttpResponse.BodyHandlers.ofString())
+                    .join();
+
+            final String responseBody = response.body();
+            return ClassiCubeAuthenticationResponse.fromJson(responseBody);
+        });
+    }
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/request/auth/ClassiCubeAuthenticationRequest.java

@@ -0,0 +1,15 @@
+package de.florianmichael.viafabricplus.definition.c0_30.classicube.request.auth;
+
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.request.ClassiCubeRequest;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.response.auth.ClassiCubeAuthenticationResponse;
+
+import java.util.concurrent.CompletableFuture;
+
+public abstract class ClassiCubeAuthenticationRequest extends ClassiCubeRequest {
+
+    public ClassiCubeAuthenticationRequest() {
+        super(token);
+    }
+
+    public abstract CompletableFuture<ClassiCubeAuthenticationResponse> send();
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/request/auth/ClassiCubeAuthenticationTokenRequest.java

@@ -0,0 +1,29 @@
+package de.florianmichael.viafabricplus.definition.c0_30.classicube.request.auth;
+
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.request.ClassiCubeRequest;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.response.auth.ClassiCubeAuthenticationResponse;
+
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.concurrent.CompletableFuture;
+
+public class ClassiCubeAuthenticationTokenRequest extends ClassiCubeAuthenticationRequest {
+    private static final HttpClient HTTP_CLIENT = HttpClient.newHttpClient();
+
+    @Override
+    public CompletableFuture<ClassiCubeAuthenticationResponse> send() {
+        return CompletableFuture.supplyAsync(() -> {
+            final HttpRequest request = HttpRequest.newBuilder()
+                    .GET()
+                    .uri(ClassiCubeRequest.AUTHENTICATION_URI)
+                    .build();
+
+            final HttpResponse<String> response = HTTP_CLIENT.sendAsync(request, HttpResponse.BodyHandlers.ofString())
+                    .join();
+
+            final String responseBody = response.body();
+            return ClassiCubeAuthenticationResponse.fromJson(responseBody);
+        });
+    }
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/request/server/ClassiCubeServerInfoRequest.java

@@ -0,0 +1,43 @@
+package de.florianmichael.viafabricplus.definition.c0_30.classicube.request.server;
+
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.request.ClassiCubeRequest;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.response.server.ClassiCubeServerInfoResponse;
+
+import java.net.URI;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+
+public class ClassiCubeServerInfoRequest extends ClassiCubeRequest {
+    private final Set<String> serverHashes;
+
+    public ClassiCubeServerInfoRequest(final String serverHash) {
+        this(Set.of(serverHash));
+    }
+
+    public ClassiCubeServerInfoRequest(final Set<String> serverHashes) {
+        this.serverHashes = serverHashes;
+    }
+
+    private URI generateUri() {
+        final String joined = String.join(",", serverHashes);
+
+        return SERVER_INFO_URI.resolve(joined);
+    }
+
+    public CompletableFuture<ClassiCubeServerInfoResponse> send() {
+        return CompletableFuture.supplyAsync(() -> {
+            final URI uri = this.generateUri();
+            final HttpRequest request = buildWithTokenHeader(HttpRequest.newBuilder()
+                    .GET()
+                    .uri(uri));
+            final HttpResponse<String> response = HTTP_CLIENT.sendAsync(request, HttpResponse.BodyHandlers.ofString())
+                    .join();
+
+            final String body = response.body();
+
+            return ClassiCubeServerInfoResponse.fromJson(body);
+        });
+    }
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/request/server/ClassiCubeServerListRequest.java

@@ -0,0 +1,24 @@
+package de.florianmichael.viafabricplus.definition.c0_30.classicube.request.server;
+
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.request.ClassiCubeRequest;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.response.server.ClassiCubeServerInfoResponse;
+
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.concurrent.CompletableFuture;
+
+public class ClassiCubeServerListRequest extends ClassiCubeRequest {
+    public CompletableFuture<ClassiCubeServerInfoResponse> send() {
+        return CompletableFuture.supplyAsync(() -> {
+            final HttpRequest request = buildWithTokenHeader(HttpRequest.newBuilder()
+                    .GET()
+                    .uri(SERVER_LIST_INFO_URI));
+            final HttpResponse<String> response = HTTP_CLIENT.sendAsync(request, HttpResponse.BodyHandlers.ofString())
+                    .join();
+
+            final String body = response.body();
+
+            return ClassiCubeServerInfoResponse.fromJson(body);
+        });
+    }
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/response/ClassiCubeResponse.java

@@ -0,0 +1,10 @@
+package de.florianmichael.viafabricplus.definition.c0_30.classicube.response;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+public abstract class ClassiCubeResponse {
+    protected final static Gson GSON = new GsonBuilder()
+            .serializeNulls()
+            .create();
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/response/auth/ClassiCubeAuthenticationResponse.java

@@ -0,0 +1,57 @@
+package de.florianmichael.viafabricplus.definition.c0_30.classicube.response.auth;
+
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.auth.ClassiCubeError;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.response.ClassiCubeResponse;
+
+import javax.annotation.Nullable;
+import java.util.Set;
+
+/**
+ * The class containing the response from the ClassiCube authentication service.
+ * Most fields, except for authenticated and errors, are null in the first request.
+ * As such, they are annotated as {@link Nullable}.
+ */
+public class ClassiCubeAuthenticationResponse extends ClassiCubeResponse {
+    @Nullable public final String token;
+    @Nullable public final String username;
+    public final boolean authenticated;
+
+    public ClassiCubeAuthenticationResponse(@Nullable String token, @Nullable String username, boolean authenticated, Set<ClassiCubeError> errors) {
+        this.token = token;
+        this.username = username;
+        this.authenticated = authenticated;
+        this.errors = errors;
+    }
+
+    public final Set<ClassiCubeError> errors;
+
+    public boolean shouldError() {
+        return errors.size() > 0 &&
+                errors.stream().anyMatch(e -> e.fatal);
+    }
+
+    public String getErrorDisplay() {
+        final StringBuilder builder = new StringBuilder();
+
+        for (ClassiCubeError error : this.errors) {
+            builder.append(error.description)
+                    .append("\n");
+        }
+
+        return builder.toString()
+                .trim();
+    }
+
+    public boolean mfaRequired() {
+        return this.errors.stream().anyMatch(e -> e == ClassiCubeError.LOGIN_CODE);
+    }
+
+    public boolean isJustMfaError() {
+        return mfaRequired() &&
+                this.errors.stream().anyMatch(e -> e != ClassiCubeError.LOGIN_CODE);
+    }
+
+    public static ClassiCubeAuthenticationResponse fromJson(final String json) {
+        return GSON.fromJson(json, ClassiCubeAuthenticationResponse.class);
+    }
+}

src/main/java/de/florianmichael/viafabricplus/definition/c0_30/classicube/response/server/ClassiCubeServerInfoResponse.java

@@ -0,0 +1,18 @@
+package de.florianmichael.viafabricplus.definition.c0_30.classicube.response.server;
+
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.data.ClassiCubeServerInfo;
+import de.florianmichael.viafabricplus.definition.c0_30.classicube.response.ClassiCubeResponse;
+
+import java.util.Set;
+
+public class ClassiCubeServerInfoResponse extends ClassiCubeResponse {
+    private final Set<ClassiCubeServerInfo> servers;
+
+    public ClassiCubeServerInfoResponse(Set<ClassiCubeServerInfo> servers) {
+        this.servers = servers;
+    }
+
+    public static ClassiCubeServerInfoResponse fromJson(final String json) {
+        return GSON.fromJson(json, ClassiCubeServerInfoResponse.class);
+    }
+}