innit commit

src/main/java/dev/chimken/graylist/Graylist.java

@@ -0,0 +1,58 @@
+package dev.chimken.graylist;
+
+import dev.chimken.graylist.commands.*;
+import dev.chimken.graylist.managers.CommandManager;
+import dev.chimken.graylist.managers.ServiceManager;
+import dev.chimken.graylist.managers.WhitelistManager;
+import dev.chimken.graylist.services.Elyby;
+import dev.chimken.graylist.services.Floodgate;
+import dev.chimken.graylist.services.Mojang;
+import io.papermc.paper.plugin.lifecycle.event.types.LifecycleEvents;
+import org.bukkit.configuration.file.FileConfiguration;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import java.util.logging.Logger;
+
+public final class Graylist extends JavaPlugin {
+    private final FileConfiguration config = getConfig();
+    private final Logger logger = getLogger();
+
+    public final ServiceManager serviceManager = new ServiceManager(config, logger);
+    public final WhitelistManager whitelistManager = new WhitelistManager(logger);
+    private final CommandManager commandManager = new CommandManager("graylist");
+
+    @Override
+    public void onEnable() {
+        saveDefaultConfig();
+
+        try {
+            serviceManager.register(new Mojang());
+            serviceManager.register(new Floodgate());
+            serviceManager.register(new Elyby());
+        } catch (ServiceManager.ServiceAlreadyExists e) {
+            throw new RuntimeException(e);
+        }
+
+        // TODO: Add modify command for editing whitelist entries directly
+        // commandManager.register(new Modify());
+
+        commandManager.register(new AddRemove_CMD());
+        commandManager.register(new List_CMD());
+        commandManager.register(new Off_CMD());
+        commandManager.register(new On_CMD());
+        commandManager.register(new Reload_CMD());
+        commandManager.register(new Services_CMD());
+        commandManager.register(new Status_CMD());
+
+        this.getLifecycleManager().registerEventHandler(
+                LifecycleEvents.COMMANDS,
+                commands ->
+                        commands.registrar().register(commandManager.build())
+        );
+    }
+
+    @Override
+    public void onDisable() {
+        serviceManager.clear();
+    }
+}

src/main/java/dev/chimken/graylist/TextStyles.java

@@ -0,0 +1,22 @@
+package dev.chimken.graylist;
+
+import net.kyori.adventure.text.event.ClickEvent;
+import net.kyori.adventure.text.event.HoverEvent;
+import net.kyori.adventure.text.format.Style;
+import net.kyori.adventure.text.format.TextColor;
+
+import java.util.UUID;
+
+import static net.kyori.adventure.text.Component.text;
+
+public class TextStyles {
+    public static Style buildUsernameStyle(UUID uuid) {
+        return Style.style()
+                .color(TextColor.fromHexString("#7FFFFD"))
+                .hoverEvent(HoverEvent.showText(
+                        text(uuid.toString())
+                ))
+                .clickEvent(ClickEvent.copyToClipboard(uuid.toString()))
+                .build();
+    }
+}

src/main/java/dev/chimken/graylist/Util.java

@@ -0,0 +1,88 @@
+package dev.chimken.graylist;
+
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import org.apache.commons.lang3.StringUtils;
+import org.bukkit.Bukkit;
+import org.bukkit.OfflinePlayer;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+
+public class Util {
+    public static final File WHITELIST_FILE = new File(Bukkit.getServer().getWorldContainer(), "whitelist.json");
+
+    public static String expandUUIDString(String uuid) {
+        StringBuilder builder = new StringBuilder(uuid);
+        builder.insert(8, "-");
+        builder.insert(13, "-");
+        builder.insert(18, "-");
+        builder.insert(23, "-");
+        return builder.toString();
+    }
+
+    public static JsonObject fetchJSON(String url) throws RuntimeException {
+        try (HttpClient client = HttpClient.newHttpClient()) {
+            HttpRequest req = HttpRequest.newBuilder()
+                    .uri(URI.create(url))
+                    .build();
+
+            HttpResponse<String> res = client.send(req, HttpResponse.BodyHandlers.ofString());
+            return JsonParser.parseString(res.body()).getAsJsonObject();
+        } catch (IOException | InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static String removePrefix(String text, String prefix) {
+        return StringUtils.replaceOnce(text, prefix, "");
+    }
+
+    public static UUID findKnownUUIDByName(String name) {
+        Set<OfflinePlayer> playerlist = new HashSet<>(Bukkit.getOnlinePlayers());
+        OfflinePlayer onlinePlayer = playerlist.stream()
+                .filter(p -> Objects.equals(p.getName(), name))
+                .findFirst()
+                .orElse(null);
+
+        if (onlinePlayer != null) return onlinePlayer.getUniqueId();
+
+        Set<OfflinePlayer> whitelist = Bukkit.getWhitelistedPlayers();
+        OfflinePlayer trustedPlayer = whitelist.stream()
+                .filter(p -> Objects.equals(p.getName(), name))
+                .findFirst()
+                .orElse(null);
+
+        if (trustedPlayer != null) return trustedPlayer.getUniqueId();
+
+        return null;
+    }
+
+    public static String findKnownNameByUUID(UUID uuid) {
+        Set<OfflinePlayer> playerlist = new HashSet<>(Bukkit.getOnlinePlayers());
+        OfflinePlayer onlinePlayer = playerlist.stream()
+                .filter(p -> Objects.equals(p.getUniqueId(), uuid))
+                .findFirst()
+                .orElse(null);
+
+        if (onlinePlayer != null) return onlinePlayer.getName();
+
+        Set<OfflinePlayer> whitelist = Bukkit.getWhitelistedPlayers();
+        OfflinePlayer trustedPlayer = whitelist.stream()
+                .filter(p -> Objects.equals(p.getUniqueId(), uuid))
+                .findFirst()
+                .orElse(null);
+
+        if (trustedPlayer != null) return trustedPlayer.getName();
+
+        return null;
+    }
+}

src/main/java/dev/chimken/graylist/abstracts/GraylistCommandBundle.java

@@ -0,0 +1,30 @@
+package dev.chimken.graylist.abstracts;
+
+import com.mojang.brigadier.builder.ArgumentBuilder;
+import dev.chimken.graylist.Graylist;
+import dev.chimken.graylist.managers.ServiceManager;
+import dev.chimken.graylist.managers.WhitelistManager;
+import org.bukkit.configuration.file.FileConfiguration;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.logging.Logger;
+
+public abstract class GraylistCommandBundle<S> {
+    private static final Graylist graylist = Graylist.getPlugin(Graylist.class);
+
+    protected final FileConfiguration config = graylist.getConfig();
+    protected final Logger logger = graylist.getLogger();
+    protected final ServiceManager serviceManager = graylist.serviceManager;
+    protected final WhitelistManager whitelistManager = graylist.whitelistManager;
+
+    private final List<ArgumentBuilder<S, ?>> commands = new ArrayList<>();
+
+    public final List<ArgumentBuilder<S, ?>> getCommands() {
+        return commands;
+    }
+
+    public final void register(ArgumentBuilder<S, ?> command) {
+        commands.add(command);
+    }
+}

src/main/java/dev/chimken/graylist/abstracts/GraylistService.java

@@ -0,0 +1,63 @@
+package dev.chimken.graylist.abstracts;
+
+import org.bukkit.configuration.ConfigurationSection;
+
+import javax.annotation.Nullable;
+import java.text.MessageFormat;
+import java.util.UUID;
+
+public abstract class GraylistService {
+    private final String SERVICE_ID;
+    private final String SERVICE_NAMESPACE;
+    private final boolean DEFAULT_STATUS;
+
+    public final String getID() {
+        return SERVICE_ID;
+    }
+    public final @Nullable String getNamespace() {
+        return SERVICE_NAMESPACE;
+    }
+    public final String getConfigPath() {
+        return "services.configs." + (
+                SERVICE_NAMESPACE != null
+                        ? SERVICE_NAMESPACE + "." + SERVICE_ID
+                        : SERVICE_ID
+        );
+    }
+    public final boolean getDefaultStatus() {
+        return DEFAULT_STATUS;
+    }
+
+    private ConfigurationSection config;
+
+    public final void setConfig(ConfigurationSection config) {
+        this.config = config;
+    }
+
+    public GraylistService(String id, boolean enabled) {
+        this(id, null, enabled);
+    }
+
+    public GraylistService(String id, @Nullable String namespace, boolean enabled) {
+        SERVICE_ID = id;
+        SERVICE_NAMESPACE = namespace;
+        DEFAULT_STATUS = enabled;
+    }
+
+    public abstract UUID findUUIDByName(String name) throws UserNotFound;
+
+    public abstract String findNameByUUID(UUID uuid) throws UserNotFound;
+
+    public class UserNotFound extends Exception {
+        public UserNotFound (String search) {
+            super(MessageFormat.format("Couldn't find '{0}' on service '{1}'", search, SERVICE_ID));
+        }
+    }
+
+    public enum PlayerWhitelistStatus {
+        ABSENT,
+        PRESENT,
+        ADDED,
+        REMOVED,
+    }
+}

src/main/java/dev/chimken/graylist/commands/AddRemove_CMD.java

@@ -0,0 +1,221 @@
+package dev.chimken.graylist.commands;
+
+import com.mojang.brigadier.Command;
+import com.mojang.brigadier.arguments.StringArgumentType;
+import com.mojang.brigadier.builder.ArgumentBuilder;
+import com.mojang.brigadier.context.CommandContext;
+import dev.chimken.graylist.TextStyles;
+import dev.chimken.graylist.Util;
+import dev.chimken.graylist.abstracts.GraylistCommandBundle;
+import dev.chimken.graylist.abstracts.GraylistService;
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+import java.util.Locale;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import java.util.logging.Level;
+
+import static io.papermc.paper.command.brigadier.Commands.*;
+import static net.kyori.adventure.text.Component.*;
+import static net.kyori.adventure.text.minimessage.tag.resolver.Placeholder.component;
+
+public class AddRemove_CMD extends GraylistCommandBundle<CommandSourceStack> {
+    public AddRemove_CMD() {
+        register(literal("add")
+                .requires(ctx -> ctx.getSender().hasPermission("graylist.command.add"))
+                .then(build(true))
+        );
+
+        register(literal("remove")
+                .requires(ctx -> ctx.getSender().hasPermission("graylist.command.remove"))
+                .then(build(false))
+        );
+    }
+
+    public ArgumentBuilder<CommandSourceStack, ?> build(boolean value) {
+        return argument("user", StringArgumentType.string())
+                .suggests((ctx, builder) -> {
+                    final String operation = ctx.getInput();
+
+                    if (operation.startsWith("/graylist add")) {
+                        Bukkit.getOnlinePlayers().stream()
+                                .map(Player::getName)
+                                .forEach(builder::suggest);
+                    } else {
+                        Bukkit.getWhitelistedPlayers().stream()
+                                .map(player -> {
+                                    final String name = player.getName();
+
+                                    if (Objects.equals(name, "<unknown>")) {
+                                        return player.getUniqueId().toString();
+                                    } else {
+                                        return name;
+                                    }
+                                })
+                                .forEach(builder::suggest);
+                    }
+
+                    return builder.buildFuture();
+                })
+                .executes(ctx -> executor(ctx, value))
+                .then(argument("service", StringArgumentType.word())
+                        .suggests((ctx, builder) -> {
+                            serviceManager.getServices().forEach(
+                                    (s, service) -> builder.suggest(s)
+                            );
+
+                            return builder.buildFuture();
+                        })
+                        .executes(ctx -> executor(ctx, value))
+                );
+    }
+
+    public int executor(CommandContext<CommandSourceStack> ctx, boolean value) {
+        final String ref = ctx.getArgument("user", String.class);
+        final CommandSender sender = ctx.getSource().getSender();
+
+        GraylistService service = serviceManager.getServices().get(
+                getServiceID(ctx)
+        );
+
+        UUID uuid = null;
+        String name = null;
+        String unprefixed_name = null;
+
+        // Determine whether UUID or name was provided
+        try {
+            uuid = UUID.fromString(ref);
+        } catch (IllegalArgumentException __) {
+            name = ref;
+
+            // reassigned to keep Java happy for use inside lambda
+            String checkName = name;
+
+            String service_id = serviceManager.getPrefixes().entrySet().stream()
+                    .filter(entry -> checkName.startsWith(entry.getValue()))
+                    .findFirst()
+                    .map(Map.Entry::getKey)
+                    .orElse(null);
+
+            if (service_id != null)
+                service = serviceManager.getServices().get(service_id);
+        }
+
+        // If service undetermined
+        if (service == null) {
+            sender.sendRichMessage("Couldn't determine service for <user>",
+                    component("user", text(ref))
+            );
+
+            return Command.SINGLE_SUCCESS;
+        }
+
+        // Search for prefix if name was provided
+        if (name != null) {
+            String service_prefix = config.getString(service.getConfigPath() + ".prefix");
+
+            // If prefix exists but name doesn't start with it, add it
+            if (service_prefix != null) {
+                if (!name.startsWith(service_prefix)) {
+                    name = service_prefix + name;
+                    unprefixed_name = name;
+                } else {
+                    unprefixed_name = Util.removePrefix(name, service_prefix);
+                }
+            }
+        }
+
+        // Isolate logging
+        {
+            String user = name != null ? name : uuid.toString();
+
+            // Verbose (console)
+            logger.log(Level.INFO, "Searching " + service.getID() + " for " + user);
+
+            // Simple (in-game)
+            sender.sendRichMessage("Finding <user>...",
+                    component("user", text(user))
+            );
+        }
+
+        // Depending on input ID, find opposite
+        if (uuid != null) {
+            try {
+                name = Util.findKnownNameByUUID(uuid);
+
+                // If unknown name, query service with UUID
+                if (name == null) name = service.findNameByUUID(uuid);
+            } catch (GraylistService.UserNotFound e) { /* ignore */ }
+        } else {
+            try {
+                uuid = Util.findKnownUUIDByName(name);
+
+                // If unknown UUID, query service with name (minus prefix)
+                if (uuid == null) uuid = service.findUUIDByName(unprefixed_name);
+            } catch (GraylistService.UserNotFound e) {
+                sender.sendRichMessage("Couldn't find <name>",
+                        component("name", text(name))
+                );
+
+                return Command.SINGLE_SUCCESS;
+            }
+        }
+
+        if (name == null) name = "<unknown>";
+
+        GraylistService.PlayerWhitelistStatus status = setWhitelisted(uuid, name, value);
+
+        switch (status) {
+            case ABSENT -> sender.sendRichMessage("<name> is not whitelisted",
+                    component("name",
+                            text(name).style(TextStyles.buildUsernameStyle(uuid))
+                    )
+            );
+
+            case PRESENT -> sender.sendRichMessage("<name> is already whitelisted",
+                    component("name",
+                            text(name).style(TextStyles.buildUsernameStyle(uuid))
+                    )
+            );
+
+            case ADDED -> sender.sendRichMessage("Added <name> to the whitelist",
+                    component("name",
+                            text(name).style(TextStyles.buildUsernameStyle(uuid))
+                    )
+            );
+
+            case REMOVED -> sender.sendRichMessage("Removed <name> from the whitelist",
+                    component("name",
+                            text(name).style(TextStyles.buildUsernameStyle(uuid))
+                    )
+            );
+
+        }
+
+        return Command.SINGLE_SUCCESS;
+    }
+
+    public String getServiceID (CommandContext<CommandSourceStack> ctx) {
+        String service_id;
+
+        try {
+            service_id = ctx.getArgument("service", String.class).toLowerCase(Locale.ROOT);
+        } catch (IllegalArgumentException e) {
+            service_id = serviceManager.getDefaultServiceID();
+        }
+
+        return service_id;
+    }
+
+    public GraylistService.PlayerWhitelistStatus setWhitelisted (UUID uuid, String name, boolean value) {
+        return whitelistManager.setWhitelisted(
+                uuid,
+                name,
+                value
+        );
+    }
+}

src/main/java/dev/chimken/graylist/commands/List_CMD.java

@@ -0,0 +1,48 @@
+package dev.chimken.graylist.commands;
+
+import com.mojang.brigadier.Command;
+import dev.chimken.graylist.TextStyles;
+import dev.chimken.graylist.abstracts.GraylistCommandBundle;
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+import net.kyori.adventure.text.TextComponent;
+import org.bukkit.Bukkit;
+
+import java.util.List;
+import java.util.UUID;
+
+import static io.papermc.paper.command.brigadier.Commands.literal;
+import static net.kyori.adventure.text.Component.text;
+
+public class List_CMD extends GraylistCommandBundle<CommandSourceStack> {
+    public List_CMD() {
+        register(literal("list")
+
+                .requires(ctx -> ctx.getSender().hasPermission("graylist.command.list"))
+                .executes(ctx -> {
+                    List<TextComponent> playerlist = Bukkit.getWhitelistedPlayers().stream()
+                            .map(player -> {
+                                final String name = player.getName();
+                                final UUID uuid = player.getUniqueId();
+
+                                return text(name != null ? name : "<unknown>")
+                                        .style(TextStyles.buildUsernameStyle(uuid));
+                            })
+                            .toList();
+                    int count = playerlist.size();
+
+                    TextComponent msg = text("There are " + count + " whitelisted player(s): \n");
+
+                    for (int i = 0; i <= (count - 1); i++) {
+                        if (i > 0 || i == (count - 1))
+                            msg = msg.append(text(", "));
+
+                        msg = msg.append(playerlist.get(i));
+                    }
+
+                    ctx.getSource().getSender().sendMessage(msg);
+
+                    return Command.SINGLE_SUCCESS;
+                })
+        );
+    }
+}

src/main/java/dev/chimken/graylist/commands/Modify_CMD.java

@@ -0,0 +1,29 @@
+package dev.chimken.graylist.commands;
+
+import com.mojang.brigadier.Command;
+import dev.chimken.graylist.abstracts.GraylistCommandBundle;
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+
+import static io.papermc.paper.command.brigadier.Commands.literal;
+
+public class Modify_CMD extends GraylistCommandBundle<CommandSourceStack> {
+    public Modify_CMD() {
+        register(literal("modify")
+                .requires(ctx -> ctx.getSender().hasPermission("graylist.command.edit"))
+                .executes(ctx -> {
+                    CommandSender sender = ctx.getSource().getSender();
+
+                    if (Bukkit.getServer().hasWhitelist())
+                        sender.sendMessage("Whitelist is already turned on");
+                    else {
+                        Bukkit.getServer().setWhitelist(true);
+                        sender.sendMessage("Whitelist is now turned on");
+                    }
+
+                    return Command.SINGLE_SUCCESS;
+                })
+        );
+    }
+}

src/main/java/dev/chimken/graylist/commands/Off_CMD.java

@@ -0,0 +1,29 @@
+package dev.chimken.graylist.commands;
+
+import com.mojang.brigadier.Command;
+import dev.chimken.graylist.abstracts.GraylistCommandBundle;
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+
+import static io.papermc.paper.command.brigadier.Commands.literal;
+
+public class Off_CMD extends GraylistCommandBundle<CommandSourceStack> {
+    public Off_CMD() {
+        register(literal("off")
+                .requires(ctx -> ctx.getSender().hasPermission("graylist.command.off"))
+                .executes(ctx -> {
+                    CommandSender sender = ctx.getSource().getSender();
+
+                    if (!Bukkit.getServer().hasWhitelist())
+                        sender.sendMessage("Whitelist is already turned off");
+                    else {
+                        Bukkit.getServer().setWhitelist(false);
+                        sender.sendMessage("Whitelist is now turned off");
+                    }
+
+                    return Command.SINGLE_SUCCESS;
+                })
+        );
+    }
+}

src/main/java/dev/chimken/graylist/commands/On_CMD.java

@@ -0,0 +1,29 @@
+package dev.chimken.graylist.commands;
+
+import com.mojang.brigadier.Command;
+import dev.chimken.graylist.abstracts.GraylistCommandBundle;
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+
+import static io.papermc.paper.command.brigadier.Commands.literal;
+
+public class On_CMD extends GraylistCommandBundle<CommandSourceStack> {
+    public On_CMD() {
+        register(literal("on")
+                .requires(ctx -> ctx.getSender().hasPermission("graylist.command.on"))
+                .executes(ctx -> {
+                    CommandSender sender = ctx.getSource().getSender();
+
+                    if (Bukkit.getServer().hasWhitelist())
+                        sender.sendMessage("Whitelist is already turned on");
+                    else {
+                        Bukkit.getServer().setWhitelist(true);
+                        sender.sendMessage("Whitelist is now turned on");
+                    }
+
+                    return Command.SINGLE_SUCCESS;
+                })
+        );
+    }
+}

src/main/java/dev/chimken/graylist/commands/Reload_CMD.java

@@ -0,0 +1,22 @@
+package dev.chimken.graylist.commands;
+
+import com.mojang.brigadier.Command;
+import dev.chimken.graylist.abstracts.GraylistCommandBundle;
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+import org.bukkit.Bukkit;
+
+import static io.papermc.paper.command.brigadier.Commands.*;
+
+public class Reload_CMD extends GraylistCommandBundle<CommandSourceStack> {
+    public Reload_CMD() {
+        register(literal("reload")
+                .requires(ctx -> ctx.getSender().hasPermission("graylist.command.reload"))
+                .executes(ctx -> {
+                    Bukkit.getServer().reloadWhitelist();
+                    ctx.getSource().getSender().sendMessage("Reloaded the whitelist");
+
+                    return Command.SINGLE_SUCCESS;
+                })
+        );
+    }
+}

src/main/java/dev/chimken/graylist/commands/Services_CMD.java

@@ -0,0 +1,31 @@
+package dev.chimken.graylist.commands;
+
+import com.mojang.brigadier.Command;
+import dev.chimken.graylist.abstracts.GraylistCommandBundle;
+import dev.chimken.graylist.abstracts.GraylistService;
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.minimessage.tag.resolver.Placeholder;
+
+import static io.papermc.paper.command.brigadier.Commands.literal;
+
+public class Services_CMD extends GraylistCommandBundle<CommandSourceStack> {
+    public Services_CMD() {
+        register(literal("services")
+                .requires(ctx -> ctx.getSender().hasPermission("graylist.command.services"))
+                .executes(ctx -> {
+                    String flatList = String.join(
+                            ", ",
+                            serviceManager.getServices().values().stream().map(GraylistService::getID).toList()
+                    );
+
+                    ctx.getSource().getSender().sendRichMessage("There are <count> service(s) available: <list>",
+                            Placeholder.component("count", Component.text(serviceManager.getServices().keySet().toArray().length)),
+                            Placeholder.component("list", Component.text(flatList))
+                    );
+
+                    return Command.SINGLE_SUCCESS;
+                })
+        );
+    }
+}

src/main/java/dev/chimken/graylist/commands/Status_CMD.java

@@ -0,0 +1,23 @@
+package dev.chimken.graylist.commands;
+
+import com.mojang.brigadier.Command;
+import dev.chimken.graylist.abstracts.GraylistCommandBundle;
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+import org.bukkit.Bukkit;
+
+import static io.papermc.paper.command.brigadier.Commands.*;
+
+public class Status_CMD extends GraylistCommandBundle<CommandSourceStack> {
+    public Status_CMD() {
+        register(literal("status")
+                .requires(ctx -> ctx.getSender().hasPermission("graylist.command.status"))
+                .executes(ctx -> {
+                    ctx.getSource().getSender().sendMessage(
+                            "Whitelist is currently " + (Bukkit.hasWhitelist() ? "on" : "off")
+                    );
+
+                    return Command.SINGLE_SUCCESS;
+                })
+        );
+    }
+}

src/main/java/dev/chimken/graylist/managers/CommandManager.java

@@ -0,0 +1,17 @@
+package dev.chimken.graylist.managers;
+
+import com.mojang.brigadier.builder.LiteralArgumentBuilder;
+import dev.chimken.graylist.abstracts.GraylistCommandBundle;
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+
+public class CommandManager extends LiteralArgumentBuilder<CommandSourceStack> {
+    public CommandManager (String label) {
+        super(label);
+
+        this.requires(ctx -> ctx.getSender().hasPermission("graylist"));
+    }
+
+    public void register(GraylistCommandBundle<CommandSourceStack> bundle) {
+        bundle.getCommands().forEach(this::then);
+    }
+}

src/main/java/dev/chimken/graylist/managers/ServiceManager.java

@@ -0,0 +1,104 @@
+package dev.chimken.graylist.managers;
+
+import dev.chimken.graylist.abstracts.GraylistService;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.configuration.file.FileConfiguration;
+
+import java.text.MessageFormat;
+import java.util.HashMap;
+import java.util.Objects;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public class ServiceManager {
+    private final FileConfiguration config;
+    private final Logger logger;
+
+    private final HashMap<String, GraylistService> services = new HashMap<>();
+    private final HashMap<String, String> prefixes = new HashMap<>();
+    private String default_service_id;
+
+    public static final String INTERNAL_NAMESPACE = "internal";
+
+    public String getDefaultServiceID() { return default_service_id; }
+    public GraylistService getDefaultService() {
+        return services.get(default_service_id);
+    }
+
+    public HashMap<String, GraylistService> getServices() {
+        return services;
+    }
+
+    public HashMap<String, String> getPrefixes() {
+        return prefixes;
+    }
+
+    public void clear() {
+        services.clear();
+        prefixes.clear();
+        default_service_id = null;
+    }
+
+    public ServiceManager (FileConfiguration config, Logger logger) {
+        this.config = config;
+        this.logger = logger;
+
+        default_service_id = config.getString("services.default");
+    }
+
+    public void register(GraylistService service) throws ServiceAlreadyExists {
+        final String id = service.getID();
+
+        if (services.containsKey(id))
+            throw new ServiceAlreadyExists(id);
+
+        final String namespace = service.getNamespace();
+        final String service_config_path = service.getConfigPath();
+
+        ConfigurationSection service_config = config.getConfigurationSection(service_config_path);
+        if (service_config == null) {
+            service_config = config.createSection(service_config_path);
+            service_config.set("enabled", true);
+        }
+
+        final int isEnabled = service_config.isBoolean("enabled")
+                ? service_config.getBoolean("enabled")
+                    ? 1 // Is enabled
+                    : 0 // Isn't enabled
+                : 2; // Not set (use default)
+
+        // If disabled (in config or by default)
+        if (isEnabled == 0 || (isEnabled == 2 && !service.getDefaultStatus())) {
+            if (!Objects.equals(namespace, INTERNAL_NAMESPACE)) logger.log(
+                    Level.INFO,
+                    MessageFormat.format(
+                            "Disabled service: {0} (external)",
+                            service.getID()
+                    )
+            );
+
+            return;
+        }
+
+        service.setConfig(service_config);
+        services.put(id, service);
+
+        String prefix = service_config.getString("prefix");
+        if (prefix != null) prefixes.put(id, prefix);
+
+        logger.log(
+                Level.INFO,
+                MessageFormat.format(
+                        "Registered service: {0} ({1})",
+                        service.getID(),
+                        Objects.equals(namespace, INTERNAL_NAMESPACE) ? "internal" : "external"
+                )
+        );
+    }
+
+    public static class ServiceAlreadyExists extends Exception {
+        ServiceAlreadyExists (String name) {
+            super("Failed to register '" + name + "' because it already exists");
+        }
+    }
+}

src/main/java/dev/chimken/graylist/managers/WhitelistManager.java

@@ -0,0 +1,61 @@
+package dev.chimken.graylist.managers;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import dev.chimken.graylist.Util;
+import dev.chimken.graylist.abstracts.GraylistService;
+import org.bukkit.Bukkit;
+import org.bukkit.OfflinePlayer;
+
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.UUID;
+import java.util.logging.Logger;
+
+public class WhitelistManager {
+    private final Logger logger;
+
+    public WhitelistManager (Logger logger) {
+        this.logger = logger;
+    }
+
+    public GraylistService.PlayerWhitelistStatus setWhitelisted(UUID uuid, String name, boolean value) {
+        OfflinePlayer player = Bukkit.getOfflinePlayer(uuid);
+
+        try {
+            JsonArray whitelist = JsonParser.parseReader(new FileReader(Util.WHITELIST_FILE)).getAsJsonArray();
+
+            if (value) {
+                if (player.isWhitelisted())
+                    return GraylistService.PlayerWhitelistStatus.PRESENT;
+                else {
+                    JsonObject entry = new JsonObject();
+                    entry.addProperty("uuid", uuid.toString());
+                    entry.addProperty("name", name);
+
+                    whitelist.add(entry);
+
+                    try (FileWriter writer = new FileWriter(Util.WHITELIST_FILE)) {
+                        new Gson().toJson(whitelist, writer);
+                    }
+
+                    Bukkit.reloadWhitelist();
+
+                    return GraylistService.PlayerWhitelistStatus.ADDED;
+                }
+            } else {
+                if (!player.isWhitelisted())
+                    return GraylistService.PlayerWhitelistStatus.ABSENT;
+                else {
+                    player.setWhitelisted(false);
+                    return GraylistService.PlayerWhitelistStatus.REMOVED;
+                }
+            }
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

src/main/java/dev/chimken/graylist/services/Elyby.java

@@ -0,0 +1,34 @@
+package dev.chimken.graylist.services;
+
+import dev.chimken.graylist.Util;
+import dev.chimken.graylist.abstracts.GraylistService;
+
+import java.util.UUID;
+
+import static dev.chimken.graylist.Util.fetchJSON;
+import static dev.chimken.graylist.managers.ServiceManager.INTERNAL_NAMESPACE;
+
+public class Elyby extends GraylistService {
+    public Elyby() {
+        super("elyby", INTERNAL_NAMESPACE, false);
+    }
+
+    @Override
+    public UUID findUUIDByName(String name) throws UserNotFound {
+        try {
+            final String id = fetchJSON("http://skinsystem.ely.by/profile/" + name)
+                    .get("id")
+                    .getAsString();
+
+            // Use expandUUIDString because UUID is collapsed initially
+            return UUID.fromString(Util.expandUUIDString(id));
+        } catch (RuntimeException e) {
+            throw new UserNotFound(name);
+        }
+    }
+
+    @Override
+    public String findNameByUUID(UUID uuid) {
+        return null;
+    }
+}

src/main/java/dev/chimken/graylist/services/Floodgate.java

@@ -0,0 +1,40 @@
+package dev.chimken.graylist.services;
+
+import dev.chimken.graylist.abstracts.GraylistService;
+
+import java.util.UUID;
+
+import static dev.chimken.graylist.Util.fetchJSON;
+import static dev.chimken.graylist.managers.ServiceManager.INTERNAL_NAMESPACE;
+
+// TODO: Don't rely on mcprofile.io; implement Xbox API instead
+
+public class Floodgate extends GraylistService {
+    public Floodgate() {
+        super("floodgate", INTERNAL_NAMESPACE, false);
+    }
+
+    @Override
+    public UUID findUUIDByName(String name) throws UserNotFound {
+        try {
+            final String id = fetchJSON("https://mcprofile.io/api/v1/bedrock/gamertag/" + name)
+                    .get("floodgateuid")
+                    .getAsString();
+
+            return UUID.fromString(id);
+        } catch (RuntimeException e) {
+            throw new UserNotFound(name);
+        }
+    }
+
+    @Override
+    public String findNameByUUID(UUID uuid) throws UserNotFound {
+        try {
+            return fetchJSON("https://mcprofile.io/api/v1/bedrock/fuid/" + uuid.toString())
+                    .get("gamertag")
+                    .getAsString();
+        } catch (RuntimeException e) {
+            throw new UserNotFound(uuid.toString());
+        }
+    }
+}

src/main/java/dev/chimken/graylist/services/Mojang.java

@@ -0,0 +1,40 @@
+package dev.chimken.graylist.services;
+
+import dev.chimken.graylist.Util;
+import dev.chimken.graylist.abstracts.GraylistService;
+
+import java.util.*;
+
+import static dev.chimken.graylist.Util.fetchJSON;
+import static dev.chimken.graylist.managers.ServiceManager.INTERNAL_NAMESPACE;
+
+public class Mojang extends GraylistService {
+    public Mojang () {
+        super("mojang", INTERNAL_NAMESPACE, true);
+    }
+
+    @Override
+    public UUID findUUIDByName(String name) throws UserNotFound {
+        try {
+            final String id = fetchJSON("https://api.mojang.com/users/profiles/minecraft/" + name)
+                    .get("id")
+                    .getAsString();
+
+            // Use expandUUIDString because UUID is collapsed initially
+            return UUID.fromString(Util.expandUUIDString(id));
+        } catch (RuntimeException e) {
+            throw new UserNotFound(name);
+        }
+    }
+
+    @Override
+    public String findNameByUUID(UUID uuid) throws UserNotFound {
+        try {
+            return fetchJSON("https://api.minecraftservices.com/minecraft/profile/lookup/" + uuid.toString())
+                    .get("name")
+                    .getAsString();
+        } catch (RuntimeException e) {
+            throw new UserNotFound(uuid.toString());
+        }
+    }
+}

src/main/resources/config.yml

@@ -0,0 +1,29 @@
+# ------------------
+# Graylist Config
+# ------------------
+
+## Plugin Language
+# Default is "en-US"
+lang: en-US
+
+## Service Configuration
+services:
+
+  ## Default service to use when a service isn't specified.
+  default: mojang
+
+  ## List of service configs
+  # By default, built-in services (except Mojang) are disabled
+  configs:
+
+    internal.mojang:
+      # enabled: false
+      # prefix:
+
+    internal.floodgate:
+      #enabled: true
+      prefix: "."
+
+    internal.elyby:
+      #enabled: true
+      #prefix:

src/main/resources/lang/en-US.yml

@@ -0,0 +1,7 @@
+graylist.add:
+  added: "Added <name> to the whitelist"
+  present: "<name> is already whitelisted"
+
+graylist.remove:
+  removed: "Removed <name> from the whitelist"
+  absent: "<name> is not whitelisted"

src/main/resources/plugin.yml

@@ -0,0 +1,70 @@
+name: Graylist
+version: ${version}
+main: dev.chimken.graylist.Graylist
+api-version: '1.21'
+permissions:
+  graylist:
+    default: op
+
+  graylist.*:
+    description: Gives access to all Graylist commands
+    default: op
+    children:
+      graylist.manage: true
+      graylist.view: true
+
+  graylist.manage:
+    description: Gives access to all Graylist management commands
+    children:
+      graylist: true
+      graylist.command.add: true
+      graylist.command.remove: true
+      graylist.command.on: true
+      graylist.command.off: true
+      graylist.command.reload: true
+
+  graylist.view:
+    description: Gives access to all Graylist state viewing commands
+    children:
+      graylist: true
+      graylist.command.list: true
+      graylist.command.status: true
+      graylist.command.services: true
+
+commands:
+  graylist:
+    usage: /graylist [subcommand]
+    permission: graylist
+    children:
+      add:
+        description: Add a user to the whitelist
+        usage: /graylist add <username|uuid> [service]
+        permission: graylist.command.add
+      remove:
+        description: Remove a user from the whitelist
+        usage: /graylist remove <username|uuid> [service]
+        permission: graylist.command.remove
+      on:
+        description: Enable the whitelist
+        usage: /graylist on
+        permission: graylist.command.on
+      off:
+        description: Disable the whitelist
+        usage: /graylist off
+        permission: graylist.command.off
+      list:
+        description: List all whitelisted users
+        usage: /graylist list
+        permission: graylist.command.list
+      status:
+        description: Get the current whitelist state
+        usage: /graylist status
+        permission: graylist.command.status
+      services:
+        description: Get all available services
+        usage: /graylist services
+        permission: graylist.command.services
+      reload:
+        description: Reload the whitelist
+        usage: /graylist reload
+        permission: graylist.command.reload