Merge pull request #868 from Grasscutters/plugin-auth

Refactor 'dispatch' server/Update plugin authentication API

src/main/java/emu/grasscutter/server/http/HttpServer.java

+package emu.grasscutter.server.http;
+
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.Grasscutter.ServerDebugMode;
+import emu.grasscutter.utils.FileUtils;
+import express.Express;
+import express.http.MediaType;
+import io.javalin.Javalin;
+import org.eclipse.jetty.server.Server;
+import org.eclipse.jetty.server.ServerConnector;
+import org.eclipse.jetty.util.ssl.SslContextFactory;
+
+import java.io.File;
+import java.io.IOException;
+
+import static emu.grasscutter.Configuration.*;
+import static emu.grasscutter.utils.Language.translate;
+
+/**
+ * Manages all HTTP-related classes.
+ * (including dispatch, announcements, gacha, etc.)
+ */
+public final class HttpServer {
+    private final Express express;
+
+    /**
+     * Configures the Express application.
+     */
+    public HttpServer() {
+        this.express = new Express(config -> {
+            // Set the Express HTTP server.
+            config.server(HttpServer::createServer);
+            
+            // Configure encryption/HTTPS/SSL.
+            config.enforceSsl = HTTP_ENCRYPTION.useEncryption;
+            
+            // Configure HTTP policies.
+            if(HTTP_POLICIES.cors.enabled) {
+                var allowedOrigins = HTTP_POLICIES.cors.allowedOrigins;
+                if (allowedOrigins.length > 0)
+                    config.enableCorsForOrigin(allowedOrigins);
+                else config.enableCorsForAllOrigins();
+            }
+            
+            // Configure debug logging.
+            if(SERVER.debugLevel == ServerDebugMode.ALL)
+                config.enableDevLogging();
+            
+            // Disable compression on static files.
+            config.precompressStaticFiles = false;
+        });
+    }
+
+    /**
+     * Creates an HTTP(S) server.
+     * @return A server instance.
+     */
+    @SuppressWarnings("resource")
+    private static Server createServer() {
+        Server server = new Server();
+        ServerConnector serverConnector
+                = new ServerConnector(server);
+        
+        if(HTTP_ENCRYPTION.useEncryption) {
+            var sslContextFactory = new SslContextFactory.Server();
+            var keystoreFile = new File(HTTP_ENCRYPTION.keystore);
+            
+            if(!keystoreFile.exists()) {
+                HTTP_ENCRYPTION.useEncryption = false;
+                HTTP_ENCRYPTION.useInRouting = false;
+                
+                Grasscutter.getLogger().warn(translate("messages.dispatch.keystore.no_keystore_error"));
+            } else try {
+                sslContextFactory.setKeyStorePath(keystoreFile.getPath());
+                sslContextFactory.setKeyStorePassword(HTTP_ENCRYPTION.keystorePassword);
+            } catch (Exception ignored) {
+                Grasscutter.getLogger().warn(translate("messages.dispatch.keystore.password_error"));
+                
+                try {
+                    sslContextFactory.setKeyStorePath(keystoreFile.getPath());
+                    sslContextFactory.setKeyStorePassword("123456");
+                    
+                    Grasscutter.getLogger().warn(translate("messages.dispatch.keystore.default_password"));
+                } catch (Exception exception) {
+                    Grasscutter.getLogger().warn(translate("messages.dispatch.keystore.general_error"), exception);
+                }
+            } finally {
+                serverConnector = new ServerConnector(server, sslContextFactory);
+            }
+        }
+        
+        serverConnector.setPort(HTTP_INFO.bindPort);
+        server.setConnectors(new ServerConnector[]{serverConnector});
+        
+        return server;
+    }
+
+    /**
+     * Returns the handle for the Express application.
+     * @return A Javalin instance.
+     */
+    public Javalin getHandle() {
+        return this.express.raw();
+    }
+
+    /**
+     * Initializes the provided class.
+     * @param router The router class.
+     * @return Method chaining.
+     */
+    @SuppressWarnings("UnusedReturnValue")
+    public HttpServer addRouter(Class<? extends Router> router, Object... args) {
+        // Get all constructor parameters.
+        Class<?>[] types = new Class<?>[args.length];
+        for(var argument : args)
+            types[args.length - 1] = argument.getClass();
+        
+        try { // Create a router instance & apply routes.
+            var constructor = router.getDeclaredConstructor(types); // Get the constructor.
+            var routerInstance = constructor.newInstance(args); // Create instance.
+            routerInstance.applyRoutes(this.express, this.getHandle()); // Apply routes.
+        } catch (Exception exception) {
+            Grasscutter.getLogger().warn(translate("messages.dispatch.router_error"), exception);
+        } return this;
+    }
+
+    /**
+     * Starts listening on the HTTP server.
+     */
+    public void start() {
+        // Attempt to start the HTTP server.
+        this.express.listen(HTTP_INFO.bindAddress, HTTP_INFO.bindPort);
+        
+        // Log bind information.
+        Grasscutter.getLogger().info(translate("messages.dispatch.port_bind", Integer.toString(this.express.raw().port())));
+    }
+
+    /**
+     * Handles the '/' (index) endpoint on the Express application.
+     */
+    public static class DefaultRequestRouter implements Router {
+        @Override public void applyRoutes(Express express, Javalin handle) {
+            express.get("/", (request, response) -> {
+                File file = new File(HTTP_STATIC_FILES.errorFile);
+                if(!file.exists())
+                    response.send("""
+                            <!DOCTYPE html>
+                            <html>
+                                <head>
+                                    <meta charset="utf8">
+                                </head>
+                                <body>%s</body>
+                            </html>
+                            """.formatted(translate("messages.status.welcome")));
+                else {
+                    final var filePath = file.getPath();
+                    final MediaType fromExtension = MediaType.getByExtension(filePath.substring(filePath.lastIndexOf(".") + 1));
+                    response.type((fromExtension != null) ? fromExtension.getMIME() : "text/plain")
+                            .send(FileUtils.read(filePath));
+                }
+            });
+        }
+    }
+
+    /**
+     * Handles unhandled endpoints on the Express application.
+     */
+    public static class UnhandledRequestRouter implements Router {
+        @Override public void applyRoutes(Express express, Javalin handle) {
+            handle.error(404, context -> {
+                if(SERVER.debugLevel == ServerDebugMode.MISSING)
+                    Grasscutter.getLogger().info(translate("messages.dispatch.unhandled_request_error", context.method(), context.url()));
+                context.contentType("text/html");
+                
+                File file = new File(HTTP_STATIC_FILES.errorFile);
+                if(!file.exists())
+                    context.result("""
+                        <!DOCTYPE html>
+                        <html>
+                            <head>
+                                <meta charset="utf8">
+                            </head>
+                            
+                            <body>
+                                <img src="https://http.cat/404" />
+                            </body>
+                        </html>
+                        """);
+                else {
+                    final var filePath = file.getPath();
+                    final MediaType fromExtension = MediaType.getByExtension(filePath.substring(filePath.lastIndexOf(".") + 1));
+                    context.contentType((fromExtension != null) ? fromExtension.getMIME() : "text/plain")
+                            .result(FileUtils.read(filePath));
+                }
+            });
+        }
+    }
+}

src/main/java/emu/grasscutter/server/http/Router.java

+package emu.grasscutter.server.http;
+
+import express.Express;
+import io.javalin.Javalin;
+
+/**
+ * Defines routes for an {@link Express} instance.
+ */
+public interface Router {
+    
+    /**
+     * Called when the router is initialized by Express.
+     * @param express An Express instance.
+     */
+    void applyRoutes(Express express, Javalin handle);
+}

src/main/java/emu/grasscutter/server/http/dispatch/DispatchHandler.java

+package emu.grasscutter.server.http.dispatch;
+
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.auth.AuthenticationSystem;
+import emu.grasscutter.server.http.Router;
+import emu.grasscutter.server.http.objects.*;
+import emu.grasscutter.server.http.objects.ComboTokenReqJson.LoginTokenData;
+import emu.grasscutter.utils.Utils;
+import express.Express;
+import express.http.Request;
+import express.http.Response;
+import io.javalin.Javalin;
+
+import static emu.grasscutter.utils.Language.translate;
+
+/**
+ * Handles requests related to authentication. (aka dispatch)
+ */
+public final class DispatchHandler implements Router {
+    @Override public void applyRoutes(Express express, Javalin handle) {
+        // Username & Password login (from client).
+        express.post("/hk4e_global/mdk/shield/api/login", DispatchHandler::clientLogin);
+        // Cached token login (from registry).
+        express.post("/hk4e_global/mdk/shield/api/verify", DispatchHandler::tokenLogin);
+        // Combo token login (from session key).
+        express.post("/hk4e_global/combo/granter/login/v2/login", DispatchHandler::sessionKeyLogin);
+        
+        // External login (from other clients).
+        express.get("/authentication/type", (request, response) -> response.send(Grasscutter.getAuthenticationSystem().getClass().getSimpleName()));
+        express.post("/authentication/login", (request, response) -> Grasscutter.getAuthenticationSystem().getExternalAuthenticator()
+                .handleLogin(AuthenticationSystem.fromExternalRequest(request, response)));
+        express.post("/authentication/register", (request, response) -> Grasscutter.getAuthenticationSystem().getExternalAuthenticator()
+                .handleAccountCreation(AuthenticationSystem.fromExternalRequest(request, response)));
+        express.post("/authentication/change_password", (request, response) -> Grasscutter.getAuthenticationSystem().getExternalAuthenticator()
+                .handlePasswordReset(AuthenticationSystem.fromExternalRequest(request, response)));
+    }
+
+    /**
+     * @route /hk4e_global/mdk/shield/api/login
+     */
+    private static void clientLogin(Request request, Response response) {
+        // Parse body data.
+        String rawBodyData = request.ctx().body();
+        var bodyData = Utils.jsonDecode(rawBodyData, LoginAccountRequestJson.class);
+        
+        // Validate body data.
+        if(bodyData == null)
+            return;
+        
+        // Pass data to authentication handler.
+        var responseData = Grasscutter.getAuthenticationSystem()
+                .getPasswordAuthenticator()
+                .authenticate(AuthenticationSystem.fromPasswordRequest(request, bodyData));
+        // Send response.
+        response.send(responseData);
+        
+        // Log to console.
+        Grasscutter.getLogger().info(translate("messages.dispatch.account.login_attempt", request.ip()));
+    }
+
+    /**
+     * @route /hk4e_global/mdk/shield/api/verify
+     */
+    private static void tokenLogin(Request request, Response response) {
+        // Parse body data.
+        String rawBodyData = request.ctx().body();
+        var bodyData = Utils.jsonDecode(rawBodyData, LoginTokenRequestJson.class);
+
+        // Validate body data.
+        if(bodyData == null)
+            return;
+
+        // Pass data to authentication handler.
+        var responseData = Grasscutter.getAuthenticationSystem()
+                .getTokenAuthenticator()
+                .authenticate(AuthenticationSystem.fromTokenRequest(request, bodyData));
+        // Send response.
+        response.send(responseData);
+
+        // Log to console.
+        Grasscutter.getLogger().info(translate("messages.dispatch.account.login_attempt", request.ip()));
+    }
+
+    /**
+     * @route /hk4e_global/combo/granter/login/v2/login
+     */
+    private static void sessionKeyLogin(Request request, Response response) {
+        // Parse body data.
+        String rawBodyData = request.ctx().body();
+        var bodyData = Utils.jsonDecode(rawBodyData, ComboTokenReqJson.class);
+
+        // Validate body data.
+        if(bodyData == null || bodyData.data == null)
+            return;
+        
+        // Decode additional body data.
+        var tokenData = Utils.jsonDecode(bodyData.data, LoginTokenData.class);
+
+        // Pass data to authentication handler.
+        var responseData = Grasscutter.getAuthenticationSystem()
+                .getSessionKeyAuthenticator()
+                .authenticate(AuthenticationSystem.fromComboTokenRequest(request, bodyData, tokenData));
+        // Send response.
+        response.send(responseData);
+
+        // Log to console.
+        Grasscutter.getLogger().info(translate("messages.dispatch.account.login_attempt", request.ip()));
+    }
+}

src/main/java/emu/grasscutter/server/http/dispatch/RegionHandler.java

+package emu.grasscutter.server.http.dispatch;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.Grasscutter.ServerRunMode;
+import emu.grasscutter.net.proto.QueryCurrRegionHttpRspOuterClass.*;
+import emu.grasscutter.net.proto.RegionInfoOuterClass;
+import emu.grasscutter.net.proto.RegionInfoOuterClass.RegionInfo;
+import emu.grasscutter.net.proto.RegionSimpleInfoOuterClass.RegionSimpleInfo;
+import emu.grasscutter.server.event.dispatch.QueryAllRegionsEvent;
+import emu.grasscutter.server.event.dispatch.QueryCurrentRegionEvent;
+import emu.grasscutter.server.http.Router;
+import emu.grasscutter.utils.Crypto;
+import emu.grasscutter.utils.FileUtils;
+import emu.grasscutter.utils.Utils;
+import express.Express;
+import express.http.Request;
+import express.http.Response;
+import io.javalin.Javalin;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Base64;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import static emu.grasscutter.Configuration.*;
+import static emu.grasscutter.net.proto.QueryRegionListHttpRspOuterClass.*;
+
+/**
+ * Handles requests related to region queries.
+ */
+public final class RegionHandler implements Router {
+    private static final Map<String, RegionData> regions = new ConcurrentHashMap<>();
+    private static String regionListResponse;
+    
+    public RegionHandler() {
+        try { // Read & initialize region data.
+            this.initialize();
+        } catch (Exception exception) {
+            Grasscutter.getLogger().error("Failed to initialize region data.", exception);
+        }
+    }
+
+    /**
+     * Configures region data according to configuration.
+     */
+    private void initialize() {
+        String dispatchDomain = "http" + (HTTP_ENCRYPTION.useInRouting ? "s" : "") + "://"
+                + lr(HTTP_INFO.accessAddress, HTTP_INFO.bindAddress) + ":"
+                + lr(HTTP_INFO.accessPort, HTTP_INFO.bindPort);
+        
+        // Create regions.
+        List<RegionSimpleInfo> servers = new ArrayList<>();
+        List<String> usedNames = new ArrayList<>(); // List to check for potential naming conflicts.
+        
+        var configuredRegions = new ArrayList<>(List.of(DISPATCH_INFO.regions));
+        if(SERVER.runMode != ServerRunMode.HYBRID && configuredRegions.size() == 0) {
+            Grasscutter.getLogger().error("[Dispatch] There are no game servers available. Exiting due to unplayable state.");
+            System.exit(1);
+        } else configuredRegions.add(new Region("os_usa", DISPATCH_INFO.defaultName,
+                lr(GAME_INFO.accessAddress, GAME_INFO.bindAddress), 
+                lr(GAME_INFO.accessPort, GAME_INFO.bindPort)));
+        
+        configuredRegions.forEach(region -> {
+            if (usedNames.contains(region.Name)) {
+                Grasscutter.getLogger().error("Region name already in use.");
+                return;
+            }
+    
+            // Create a region identifier.
+            var identifier = RegionSimpleInfo.newBuilder()
+                    .setName(region.Name).setTitle(region.Title).setType("DEV_PUBLIC")
+                    .setDispatchUrl(dispatchDomain + "/query_cur_region/" + region.Name)
+                    .build();
+            usedNames.add(region.Name); servers.add(identifier);
+            
+            // Create a region info object.
+            var regionInfo = RegionInfo.newBuilder()
+                    .setGateserverIp(region.Ip).setGateserverPort(region.Port)
+                    .setSecretKey(ByteString.copyFrom(Crypto.DISPATCH_SEED))
+                    .build();
+            // Create an updated region query.
+            var updatedQuery = QueryCurrRegionHttpRsp.newBuilder().setRegionInfo(regionInfo).build();
+            regions.put(region.Name, new RegionData(updatedQuery, Utils.base64Encode(updatedQuery.toByteString().toByteArray())));
+        });
+        
+        // Create a config object.
+        byte[] customConfig = "{\"sdkenv\":\"2\",\"checkdevice\":\"false\",\"loadPatch\":\"false\",\"showexception\":\"false\",\"regionConfig\":\"pm|fk|add\",\"downloadMode\":\"0\"}".getBytes();
+        Crypto.xor(customConfig, Crypto.DISPATCH_KEY); // XOR the config with the key.
+        
+        // Create an updated region list.
+        QueryRegionListHttpRsp updatedRegionList = QueryRegionListHttpRsp.newBuilder()
+                .addAllRegionList(servers)
+                .setClientSecretKey(ByteString.copyFrom(Crypto.DISPATCH_SEED))
+                .setClientCustomConfigEncrypted(ByteString.copyFrom(customConfig))
+                .setEnableLoginPc(true).build();
+        
+        // Set the region list response.
+        regionListResponse = Utils.base64Encode(updatedRegionList.toByteString().toByteArray());
+    }
+    
+    @Override public void applyRoutes(Express express, Javalin handle) {
+        express.get("/query_region_list", RegionHandler::queryRegionList);
+        express.get("/query_cur_region/:region", RegionHandler::queryCurrentRegion );
+    }
+
+    /**
+     * @route /query_region_list
+     */
+    private static void queryRegionList(Request request, Response response) {
+        // Invoke event.
+        QueryAllRegionsEvent event = new QueryAllRegionsEvent(regionListResponse); event.call();
+        // Respond with event result.
+        response.send(event.getRegionList());
+        
+        // Log to console.
+        Grasscutter.getLogger().info(String.format("[Dispatch] Client %s request: query_region_list", request.ip()));
+    }
+
+    /**
+     * @route /query_cur_region/:region
+     */
+    private static void queryCurrentRegion(Request request, Response response) {
+        // Get region to query.
+        String regionName = request.params("region");
+        
+        // Get region data.
+        String regionData = "CAESGE5vdCBGb3VuZCB2ZXJzaW9uIGNvbmZpZw==";
+        if (request.query().values().size() > 0) {
+            var region = regions.get(regionName);
+            if(region != null) regionData = region.getBase64();
+        }
+        
+        // Invoke event.
+        QueryCurrentRegionEvent event = new QueryCurrentRegionEvent(regionData); event.call();
+        // Respond with event result.
+        response.send(event.getRegionInfo());
+
+        // Log to console.
+        Grasscutter.getLogger().info(String.format("Client %s request: query_cur_region/%s", request.ip(), regionName));
+    }
+
+    /**
+     * Region data container.
+     */
+    public static class RegionData {
+        private final QueryCurrRegionHttpRsp regionQuery;
+        private final String base64;
+
+        public RegionData(QueryCurrRegionHttpRsp prq, String b64) {
+            this.regionQuery = prq;
+            this.base64 = b64;
+        }
+
+        public QueryCurrRegionHttpRsp getRegionQuery() {
+            return this.regionQuery;
+        }
+
+        public String getBase64() {
+            return this.base64;
+        }
+    }
+
+    /**
+     * Gets the current region query.
+     * @return A {@link QueryCurrRegionHttpRsp} object.
+     */
+    public static QueryCurrRegionHttpRsp getCurrentRegion() {
+        return SERVER.runMode == ServerRunMode.HYBRID ? regions.get("os_usa").getRegionQuery() : null;
+    }
+}

src/main/java/emu/grasscutter/server/http/handlers/AnnouncementsHandler.java

+package emu.grasscutter.server.http.handlers;
+
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.server.http.objects.HttpJsonResponse;
+import emu.grasscutter.server.http.Router;
+import emu.grasscutter.utils.FileUtils;
+import emu.grasscutter.utils.Utils;
+import express.Express;
+import express.http.Request;
+import express.http.Response;
+import io.javalin.Javalin;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.file.Paths;
+import java.util.Objects;
+
+import static emu.grasscutter.Configuration.DATA;
+
+/**
+ * Handles requests related to the announcements page.
+ */
+public final class AnnouncementsHandler implements Router {
+    private static String template, swjs, vue;
+    
+    public AnnouncementsHandler() {
+        var templateFile = new File(Utils.toFilePath(DATA("/hk4e/announcement/index.html")));
+        var swjsFile = new File(Utils.toFilePath(DATA("/hk4e/announcement/sw.js")));
+        var vueFile = new File(Utils.toFilePath(DATA("/hk4e/announcement/vue.min.js")));
+        
+        template = templateFile.exists() ? new String(FileUtils.read(template)) : null;
+        swjs = swjsFile.exists() ? new String(FileUtils.read(swjs)) : null;
+        vue = vueFile.exists() ? new String(FileUtils.read(vueFile)) : null;
+    }
+    
+    @Override public void applyRoutes(Express express, Javalin handle) {
+        // hk4e-api-os.hoyoverse.com
+        express.all("/common/hk4e_global/announcement/api/getAlertPic", new HttpJsonResponse("{\"retcode\":0,\"message\":\"OK\",\"data\":{\"total\":0,\"list\":[]}}"));
+        // hk4e-api-os.hoyoverse.com
+        express.all("/common/hk4e_global/announcement/api/getAlertAnn", new HttpJsonResponse("{\"retcode\":0,\"message\":\"OK\",\"data\":{\"alert\":false,\"alert_id\":0,\"remind\":true}}"));
+        // hk4e-api-os.hoyoverse.com
+        express.all("/common/hk4e_global/announcement/api/getAnnList", AnnouncementsHandler::getAnnouncement);
+        // hk4e-api-os-static.hoyoverse.com
+        express.all("/common/hk4e_global/announcement/api/getAnnContent", AnnouncementsHandler::getAnnouncement);
+        // hk4e-sdk-os.hoyoverse.com
+        express.all("/hk4e_global/mdk/shopwindow/shopwindow/listPriceTier", new HttpJsonResponse("{\"retcode\":0,\"message\":\"OK\",\"data\":{\"suggest_currency\":\"USD\",\"tiers\":[]}}"));
+
+        express.get("/hk4e/announcement/*", AnnouncementsHandler::getPageResources);
+        express.get("/sw.js", AnnouncementsHandler::getPageResources);
+        express.get("/dora/lib/vue/2.6.11/vue.min.js", AnnouncementsHandler::getPageResources);
+    }
+    
+    private static void getAnnouncement(Request request, Response response) {
+        if (Objects.equals(request.baseUrl(), "/common/hk4e_global/announcement/api/getAnnContent")) {
+            String data = readToString(Paths.get(DATA("GameAnnouncement.json")).toFile());
+            response.send("{\"retcode\":0,\"message\":\"OK\",\"data\":" + data + "}");
+        } else if (Objects.equals(request.baseUrl(), "/common/hk4e_global/announcement/api/getAnnList")) {
+            String data = readToString(Paths.get(DATA("GameAnnouncementList.json")).toFile())
+                    .replace("System.currentTimeMillis()", String.valueOf(System.currentTimeMillis()));
+            response.send("{\"retcode\":0,\"message\":\"OK\",\"data\": " + data + "}");
+        }
+    }
+    
+    private static void getPageResources(Request request, Response response) {
+        var path = request.path();
+        switch(path) {
+            case "/sw.js" -> response.send(swjs);
+            case "/hk4e/announcement/index.html" -> response.send(template);
+            case "/dora/lib/vue/2.6.11/vue.min.js" -> response.send(vue);
+            
+            default -> {
+                File renderFile = new File(Utils.toFilePath(DATA(path)));
+                if(!renderFile.exists()) {
+                    Grasscutter.getLogger().info("File not exist: " + path);
+                    return;
+                }
+
+                String ext = path.substring(path.lastIndexOf(".") + 1);
+                if ("css".equals(ext)) {
+                    response.type("text/css");
+                    response.send(FileUtils.read(renderFile));
+                } else {
+                    response.send(FileUtils.read(renderFile));
+                }
+            }
+        }
+    }
+
+    @SuppressWarnings("ResultOfMethodCallIgnored")
+    private static String readToString(File file) {
+        long length = file.length();
+        byte[] content = new byte[(int) length];
+        
+        try {
+            FileInputStream in = new FileInputStream(file);
+            in.read(content); in.close();
+        } catch (IOException ignored) {
+            Grasscutter.getLogger().warn("File not found: " + file.getAbsolutePath());
+        }
+
+        return new String(content);
+    }
+}

src/main/java/emu/grasscutter/server/http/handlers/GachaHandler.java

+package emu.grasscutter.server.http.handlers;
+
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.database.DatabaseHelper;
+import emu.grasscutter.game.Account;
+import emu.grasscutter.game.gacha.GachaBanner;
+import emu.grasscutter.game.gacha.GachaManager;
+import emu.grasscutter.game.player.Player;
+import emu.grasscutter.server.http.Router;
+import emu.grasscutter.tools.Tools;
+import emu.grasscutter.utils.FileUtils;
+import emu.grasscutter.utils.Utils;
+import express.Express;
+import express.http.Request;
+import express.http.Response;
+import io.javalin.Javalin;
+import io.javalin.http.staticfiles.Location;
+
+import java.io.File;
+import java.util.Arrays;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+import static emu.grasscutter.Configuration.DATA;
+import static emu.grasscutter.utils.Language.translate;
+
+/**
+ * Handles all gacha-related HTTP requests.
+ */
+public final class GachaHandler implements Router {
+    private final String gachaMappings;
+    
+    private static String recordsTemplate = "";
+    private static String detailsTemplate = "";
+    
+    public GachaHandler() {
+        this.gachaMappings = Utils.toFilePath(DATA("/gacha_mappings.js"));
+        if(!(new File(this.gachaMappings).exists())) {
+            try {
+                Tools.createGachaMapping(this.gachaMappings);
+            } catch (Exception exception) {
+                Grasscutter.getLogger().warn("Failed to create gacha mappings.", exception);
+            }
+        }
+        
+        var templateFile = new File(DATA("/gacha_records.html"));
+        recordsTemplate = templateFile.exists() ? new String(FileUtils.read(templateFile)) : "{{REPLACE_RECORD}}";
+
+        templateFile = new File(Utils.toFilePath(DATA("/gacha_details.html")));
+        detailsTemplate = templateFile.exists() ? new String(FileUtils.read(templateFile)) : null;
+    }
+    
+    @Override public void applyRoutes(Express express, Javalin handle) {
+        express.get("/gacha", GachaHandler::gachaRecords);
+        express.get("/gacha/details", GachaHandler::gachaDetails);
+        
+        express.useStaticFallback("/gacha/mappings", this.gachaMappings, Location.EXTERNAL);
+    }
+    
+    private static void gachaRecords(Request request, Response response) {
+        var sessionKey = request.query("s");
+        
+        int page = 0, gachaType = 0;
+        if(request.query("p") != null)
+            page = Integer.parseInt(request.query("p"));
+        if(request.query("gachaType") != null)
+            gachaType = Integer.parseInt(request.query("gachaType"));
+        
+        // Get account from session key.
+        var account = DatabaseHelper.getAccountBySessionKey(sessionKey);
+        
+        if(account == null) // Send response.
+            response.status(404).send("Unable to find account.");
+        else {
+            String records = DatabaseHelper.getGachaRecords(account.getPlayerUid(), gachaType, page).toString();
+            long maxPage = DatabaseHelper.getGachaRecordsMaxPage(account.getPlayerUid(), page, gachaType);
+            
+            response.send(recordsTemplate
+                    .replace("{{REPLACE_RECORD}}", records)
+                    .replace("{{REPLACE_MAXPAGE}}", String.valueOf(maxPage)));
+        }
+    }
+    
+    private static void gachaDetails(Request request, Response response) {
+        String template = detailsTemplate;
+
+        // Get player info (for langauge).
+        String sessionKey = request.query("s");
+        Account account = DatabaseHelper.getAccountBySessionKey(sessionKey);
+        Player player = Grasscutter.getGameServer().getPlayerByUid(account.getPlayerUid());
+
+        // If the template was not loaded, return an error.
+        if (detailsTemplate == null) {
+            response.send(translate(player, "gacha.details.template_missing"));
+            return;
+        }
+
+        // Add translated title etc. to the page.
+        template = template.replace("{{TITLE}}", translate(player, "gacha.details.title"))
+                .replace("{{AVAILABLE_FIVE_STARS}}", translate(player, "gacha.details.available_five_stars"))
+                .replace("{{AVAILABLE_FOUR_STARS}}", translate(player, "gacha.details.available_four_stars"))
+                .replace("{{AVAILABLE_THREE_STARS}}", translate(player, "gacha.details.available_three_stars"))
+                .replace("{{LANGUAGE}}", Utils.getLanguageCode(account.getLocale()));
+
+        // Get the banner info for the banner we want.
+        int gachaType = Integer.parseInt(request.query("gachaType"));
+        GachaManager manager = Grasscutter.getGameServer().getGachaManager();
+        GachaBanner banner = manager.getGachaBanners().get(gachaType);
+
+        // Add 5-star items.
+        Set<String> fiveStarItems = new LinkedHashSet<>();
+
+        Arrays.stream(banner.getRateUpItems5()).forEach(i -> fiveStarItems.add(Integer.toString(i)));
+        Arrays.stream(banner.getFallbackItems5Pool1()).forEach(i -> fiveStarItems.add(Integer.toString(i)));
+        Arrays.stream(banner.getFallbackItems5Pool2()).forEach(i -> fiveStarItems.add(Integer.toString(i)));
+
+        template = template.replace("{{FIVE_STARS}}", "[" + String.join(",", fiveStarItems) + "]");
+
+        // Add 4-star items.
+        Set<String> fourStarItems = new LinkedHashSet<>();
+
+        Arrays.stream(banner.getRateUpItems4()).forEach(i -> fourStarItems.add(Integer.toString(i)));
+        Arrays.stream(banner.getFallbackItems4Pool1()).forEach(i -> fourStarItems.add(Integer.toString(i)));
+        Arrays.stream(banner.getFallbackItems4Pool2()).forEach(i -> fourStarItems.add(Integer.toString(i)));
+
+        template = template.replace("{{FOUR_STARS}}", "[" + String.join(",", fourStarItems) + "]");
+
+        // Add 3-star items.
+        Set<String> threeStarItems = new LinkedHashSet<>();
+        Arrays.stream(banner.getFallbackItems3()).forEach(i -> threeStarItems.add(Integer.toString(i)));
+        template = template.replace("{{THREE_STARS}}", "[" + String.join(",", threeStarItems) + "]");
+
+        // Done.
+        response.send(template);
+    }
+}

src/main/java/emu/grasscutter/server/http/handlers/GenericHandler.java

+package emu.grasscutter.server.http.handlers;
+
+import emu.grasscutter.GameConstants;
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.server.http.objects.HttpJsonResponse;
+import emu.grasscutter.server.http.Router;
+import express.Express;
+import express.http.Request;
+import express.http.Response;
+import io.javalin.Javalin;
+
+/**
+ * Handles all generic, hard-coded responses.
+ */
+public final class GenericHandler implements Router {
+    @Override public void applyRoutes(Express express, Javalin handle) {
+        // hk4e-sdk-os.hoyoverse.com
+        express.get("/hk4e_global/mdk/agreement/api/getAgreementInfos", new HttpJsonResponse("{\"retcode\":0,\"message\":\"OK\",\"data\":{\"marketing_agreements\":[]}}"));
+        // hk4e-sdk-os.hoyoverse.com
+        // this could be either GET or POST based on the observation of different clients
+        express.all("/hk4e_global/combo/granter/api/compareProtocolVersion", new HttpJsonResponse("{\"retcode\":0,\"message\":\"OK\",\"data\":{\"modified\":true,\"protocol\":{\"id\":0,\"app_id\":4,\"language\":\"en\",\"user_proto\":\"\",\"priv_proto\":\"\",\"major\":7,\"minimum\":0,\"create_time\":\"0\",\"teenager_proto\":\"\",\"third_proto\":\"\"}}}"));
+
+        // api-account-os.hoyoverse.com
+        express.post("/account/risky/api/check", new HttpJsonResponse("{\"retcode\":0,\"message\":\"OK\",\"data\":{\"id\":\"none\",\"action\":\"ACTION_NONE\",\"geetest\":null}}"));
+        
+        // sdk-os-static.hoyoverse.com
+        express.get("/combo/box/api/config/sdk/combo", new HttpJsonResponse("{\"retcode\":0,\"message\":\"OK\",\"data\":{\"vals\":{\"disable_email_bind_skip\":\"false\",\"email_bind_remind_interval\":\"7\",\"email_bind_remind\":\"true\"}}}"));
+        // hk4e-sdk-os-static.hoyoverse.com
+        express.get("/hk4e_global/combo/granter/api/getConfig", new HttpJsonResponse("{\"retcode\":0,\"message\":\"OK\",\"data\":{\"protocol\":true,\"qr_enabled\":false,\"log_level\":\"INFO\",\"announce_url\":\"https://webstatic-sea.hoyoverse.com/hk4e/announcement/index.html?sdk_presentation_style=fullscreen\\u0026sdk_screen_transparent=true\\u0026game_biz=hk4e_global\\u0026auth_appid=announcement\\u0026game=hk4e#/\",\"push_alias_type\":2,\"disable_ysdk_guard\":false,\"enable_announce_pic_popup\":true}}"));
+        // hk4e-sdk-os-static.hoyoverse.com
+        express.get("/hk4e_global/mdk/shield/api/loadConfig", new HttpJsonResponse("{\"retcode\":0,\"message\":\"OK\",\"data\":{\"id\":6,\"game_key\":\"hk4e_global\",\"client\":\"PC\",\"identity\":\"I_IDENTITY\",\"guest\":false,\"ignore_versions\":\"\",\"scene\":\"S_NORMAL\",\"name\":\"原神海外\",\"disable_regist\":false,\"enable_email_captcha\":false,\"thirdparty\":[\"fb\",\"tw\"],\"disable_mmt\":false,\"server_guest\":false,\"thirdparty_ignore\":{\"tw\":\"\",\"fb\":\"\"},\"enable_ps_bind_account\":false,\"thirdparty_login_configs\":{\"tw\":{\"token_type\":\"TK_GAME_TOKEN\",\"game_token_expires_in\":604800},\"fb\":{\"token_type\":\"TK_GAME_TOKEN\",\"game_token_expires_in\":604800}}}}"));
+        // Test api?
+        // abtest-api-data-sg.hoyoverse.com
+        express.post("/data_abtest_api/config/experiment/list", new HttpJsonResponse("{\"retcode\":0,\"success\":true,\"message\":\"\",\"data\":[{\"code\":1000,\"type\":2,\"config_id\":\"14\",\"period_id\":\"6036_99\",\"version\":\"1\",\"configs\":{\"cardType\":\"old\"}}]}"));
+        
+        // log-upload-os.mihoyo.com
+        express.all("/log/sdk/upload", new HttpJsonResponse("{\"code\":0}"));
+        express.all("/sdk/upload", new HttpJsonResponse("{\"code\":0}"));
+        express.post("/sdk/dataUpload", new HttpJsonResponse("{\"code\":0}"));
+        // /perf/config/verify?device_id=xxx&platform=x&name=xxx
+        express.all("/perf/config/verify", new HttpJsonResponse("{\"code\":0}"));
+
+        // webstatic-sea.hoyoverse.com
+        express.get("/admin/mi18n/plat_oversea/m202003048/m202003048-version.json", new HttpJsonResponse("{\"version\":51}"));
+        
+        express.get("/status/server", GenericHandler::serverStatus);
+    }
+    
+    private static void serverStatus(Request request, Response response) {
+        int playerCount = Grasscutter.getGameServer().getPlayers().size();
+        String version = GameConstants.VERSION;
+
+        response.send("{\"retcode\":0,\"status\":{\"playerCount\":" + playerCount + ",\"version\":\"" + version + "\"}}");
+    }
+}

src/main/java/emu/grasscutter/server/http/handlers/LogHandler.java

+package emu.grasscutter.server.http.handlers;
+
+import emu.grasscutter.server.http.Router;
+import express.Express;
+import express.http.Request;
+import express.http.Response;
+import io.javalin.Javalin;
+
+/**
+ * Handles logging requests made to the server.
+ */
+public final class LogHandler implements Router {
+    @Override public void applyRoutes(Express express, Javalin handle) {
+        // overseauspider.yuanshen.com
+        express.post("/log", LogHandler::log);
+        // log-upload-os.mihoyo.com
+        express.post("/crash/dataUpload", LogHandler::log);
+    }
+    
+    private static void log(Request request, Response response) {
+        // TODO: Figure out how to dump request body and log to file.
+        response.send("{\"code\":0}");
+    }
+}

src/main/java/emu/grasscutter/server/dispatch/json/ComboTokenReqJson.java → src/main/java/emu/grasscutter/server/http/objects/ComboTokenReqJson.java

-package emu.grasscutter.server.dispatch.json;
+package emu.grasscutter.server.http.objects;
 
 public class ComboTokenReqJson {
 	public int app_id;

src/main/java/emu/grasscutter/server/dispatch/json/ComboTokenResJson.java → src/main/java/emu/grasscutter/server/http/objects/ComboTokenResJson.java

-package emu.grasscutter.server.dispatch.json;
+package emu.grasscutter.server.http.objects;
 
 public class ComboTokenResJson {
 	public String message;

src/main/java/emu/grasscutter/server/dispatch/DispatchHttpJsonHandler.java → src/main/java/emu/grasscutter/server/http/objects/HttpJsonResponse.java

-package emu.grasscutter.server.dispatch;
+package emu.grasscutter.server.http.objects;
 
 import java.io.IOException;
 import java.util.Arrays;
@@ -13,7 +13,7 @@ import express.http.Response;
 import static emu.grasscutter.utils.Language.translate;
 import static emu.grasscutter.Configuration.*;
 
-public final class DispatchHttpJsonHandler implements HttpContextHandler {
+public final class HttpJsonResponse implements HttpContextHandler {
 	private final String response;
 	private final String[] missingRoutes = { // TODO: When http requests for theses routes are found please remove it from this list and update the route request type in the DispatchServer
 			"/common/hk4e_global/announcement/api/getAlertPic",
@@ -28,7 +28,7 @@ public final class DispatchHttpJsonHandler implements HttpContextHandler {
 			"/crash/dataUpload"
 	};
 	
-	public DispatchHttpJsonHandler(String response) {
+	public HttpJsonResponse(String response) {
 		this.response = response;
 	}
 

src/main/java/emu/grasscutter/server/dispatch/json/LoginAccountRequestJson.java → src/main/java/emu/grasscutter/server/http/objects/LoginAccountRequestJson.java

-package emu.grasscutter.server.dispatch.json;
+package emu.grasscutter.server.http.objects;
 
 public class LoginAccountRequestJson {
 	public String account;

src/main/java/emu/grasscutter/server/dispatch/json/LoginResultJson.java → src/main/java/emu/grasscutter/server/http/objects/LoginResultJson.java

-package emu.grasscutter.server.dispatch.json;
+package emu.grasscutter.server.http.objects;
 
 public class LoginResultJson {
 	public String message;

src/main/java/emu/grasscutter/server/dispatch/json/LoginTokenRequestJson.java → src/main/java/emu/grasscutter/server/http/objects/LoginTokenRequestJson.java

-package emu.grasscutter.server.dispatch.json;
+package emu.grasscutter.server.http.objects;
 
 public class LoginTokenRequestJson {
 	public String uid;

src/main/java/emu/grasscutter/server/packet/send/PacketPlayerLoginRsp.java

@@ -9,11 +9,13 @@ import emu.grasscutter.net.proto.PlayerLoginRspOuterClass.PlayerLoginRsp;
 import emu.grasscutter.net.proto.QueryCurrRegionHttpRspOuterClass;
 import emu.grasscutter.net.proto.RegionInfoOuterClass.RegionInfo;
 import emu.grasscutter.server.game.GameSession;
+import emu.grasscutter.server.http.dispatch.RegionHandler;
 import emu.grasscutter.utils.Crypto;
 import emu.grasscutter.utils.FileUtils;
 
 import java.io.File;
 import java.util.Base64;
+import java.util.Objects;
 
 import static emu.grasscutter.Configuration.*;
 
@@ -46,7 +48,7 @@ public class PacketPlayerLoginRsp extends BasePacket {
 
 			info = regionCache.getRegionInfo();
 		} else {
-			info = Grasscutter.getDispatchServer().getCurrRegion().getRegionInfo();
+			info = Objects.requireNonNull(RegionHandler.getCurrentRegion()).getRegionInfo();
 		}
 
 		PlayerLoginRsp p = PlayerLoginRsp.newBuilder()

src/main/java/emu/grasscutter/utils/ConfigContainer.java

@@ -17,7 +17,7 @@ import static emu.grasscutter.Grasscutter.config;
  */
 public class ConfigContainer {
     private static int version() {
-        return 2;
+        return 3;
     }
 
     /**
@@ -96,8 +96,10 @@ public class ConfigContainer {
         public ServerDebugMode debugLevel = ServerDebugMode.NONE;
         public ServerRunMode runMode = ServerRunMode.HYBRID;
 
-        public Dispatch dispatch = new Dispatch();
+        public HTTP http = new HTTP();
         public Game game = new Game();
+        
+        public Dispatch dispatch = new Dispatch();
     }
 
     public static class Language {
@@ -112,7 +114,7 @@ public class ConfigContainer {
 
     /* Server options. */
     
-    public static class Dispatch {
+    public static class HTTP {
         public String bindAddress = "0.0.0.0";
         /* This is the address used in URLs. */
         public String accessAddress = "127.0.0.1";
@@ -123,9 +125,7 @@ public class ConfigContainer {
         
         public Encryption encryption = new Encryption();
         public Policies policies = new Policies();
-        public Region[] regions = {};
-
-        public String defaultName = "Grasscutter";
+        public Files files = new Files();
     }
 
     public static class Game {
@@ -144,6 +144,12 @@ public class ConfigContainer {
 
     /* Data containers. */
 
+    public static class Dispatch {
+        public Region[] regions = {};
+
+        public String defaultName = "Grasscutter";
+    }
+
     public static class Encryption {
         public boolean useEncryption = true;
         /* Should 'https' be appended to URLs? */
@@ -223,9 +229,26 @@ public class ConfigContainer {
         public String signature = "Welcome to Grasscutter!";
     }
     
+    public static class Files {
+        public String indexFile = "./index.html";
+        public String errorFile = "./404.html";
+    }
+
     /* Objects. */
 
     public static class Region {
+        public Region() { }
+        
+        public Region(
+                String name, String title,
+                String address, int port
+        ) {
+            this.Name = name;
+            this.Title = title;
+            this.Ip = address;
+            this.Port  = port;
+        }
+        
         public String Name = "os_usa";
         public String Title = "Grasscutter";
         public String Ip = "127.0.0.1";

src/main/java/emu/grasscutter/utils/Utils.java

@@ -6,10 +6,7 @@ import java.nio.file.Files;
 import java.nio.file.StandardCopyOption;
 import java.time.*;
 import java.time.temporal.TemporalAdjusters;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Random;
-import java.util.Locale;
+import java.util.*;
 
 import emu.grasscutter.Grasscutter;
 import io.netty.buffer.ByteBuf;
@@ -309,13 +306,6 @@ public final class Utils {
 		return map;
 	}
 
-	/**
-	 * get language code from Locale
-	 */
-    public static String getLanguageCode(Locale locale) {
-        return String.format("%s-%s", locale.getLanguage(), locale.getCountry());
-    }
-
 	/**
 	 * Performs a linear interpolation using a table of fixed points to create an effective piecewise f(x) = y function.
 	 * @param x
@@ -380,4 +370,44 @@ public final class Utils {
 		}
 		return temp.toIntArray();
 	}
+
+	/**
+	 * Gets the language code from a given locale.
+	 * @param locale A locale.
+	 * @return A string in the format of 'XX-XX'.
+	 */
+	public static String getLanguageCode(Locale locale) {
+		return String.format("%s-%s", locale.getLanguage(), locale.getCountry());
+	}
+
+	/**
+	 * Base64 encodes a given byte array.
+	 * @param toEncode An array of bytes.
+	 * @return A base64 encoded string.
+	 */
+	public static String base64Encode(byte[] toEncode) {
+		return Base64.getEncoder().encodeToString(toEncode);
+	}
+
+	/**
+	 * Base64 decodes a given string.
+	 * @param toDecode A base64 encoded string.
+	 * @return An array of bytes.
+	 */
+	public static byte[] base64Decode(String toDecode) {
+		return Base64.getDecoder().decode(toDecode);
+	}
+
+	/**
+	 * Safely JSON decodes a given string.
+	 * @param jsonData The JSON-encoded data.
+	 * @return JSON decoded data, or null if an exception occurred.
+	 */
+	public static <T> T jsonDecode(String jsonData, Class<T> classType) {
+		try {
+			return Grasscutter.getGsonFactory().fromJson(jsonData, classType);
+		} catch (Exception ignored) {
+			return null;
+		}
+	}
 }

src/main/resources/languages/en-US.json

@@ -36,7 +36,8 @@
         "session_key_error": "Wrong session key.",
         "username_error": "Username not found.",
         "username_create_error": "Username not found, create failed."
-      }
+      },
+      "router_error": "[Dispatch] Unable to attach router."
     },
     "status": {
       "free_software": "Grasscutter is FREE software. If you have paid for this, you may have been scammed. Homepage: https://github.com/Grasscutters/Grasscutter",