feat(platform): add Discord onboarding and Velocity gate

apps/discord-bot/src/commands.ts

@@ -0,0 +1,10 @@
+import { SlashCommandBuilder } from "discord.js";
+
+export const commands = [
+  new SlashCommandBuilder()
+    .setName("register")
+    .setDescription("Register a Minecraft account through a private login link"),
+  new SlashCommandBuilder()
+    .setName("account")
+    .setDescription("Open your Minecraft account dashboard through a private login link"),
+].map((command) => command.toJSON());

apps/discord-bot/src/config.ts

@@ -0,0 +1,7 @@
+export function requiredEnvironment(name: string) {
+  const value = process.env[name]?.trim();
+  if (!value) throw new Error(`Missing required environment variable: ${name}`);
+  return value;
+}
+
+export const commandNames = ["register", "account"] as const;

apps/discord-bot/src/deploy-commands.ts

@@ -0,0 +1,11 @@
+import "dotenv/config";
+import { REST, Routes } from "discord.js";
+import { commands } from "./commands";
+import { requiredEnvironment } from "./config";
+
+const token = requiredEnvironment("DISCORD_BOT_TOKEN");
+const applicationId = requiredEnvironment("DISCORD_APPLICATION_ID");
+const rest = new REST({ version: "10" }).setToken(token);
+
+await rest.put(Routes.applicationCommands(applicationId), { body: commands });
+console.log(`Deployed ${commands.length} global Discord commands.`);

apps/discord-bot/src/index.ts

@@ -1,2 +1,79 @@
-// Discord command handling is added in Phase 2 after the one-time login service exists.
-export {};
+import "dotenv/config";
+import { createMagicLink, LoginRateLimitedError } from "@minecraft-account-manager/auth";
+import {
+  createAuthRepository,
+  createDatabase,
+  recordEvent,
+} from "@minecraft-account-manager/database";
+import {
+  ActionRowBuilder,
+  ButtonBuilder,
+  ButtonStyle,
+  Client,
+  Events,
+  GatewayIntentBits,
+} from "discord.js";
+import { commandNames, requiredEnvironment } from "./config";
+
+const token = requiredEnvironment("DISCORD_BOT_TOKEN");
+const appUrl = requiredEnvironment("APP_URL");
+const databaseUrl = requiredEnvironment("DATABASE_URL");
+const discordGuildId = requiredEnvironment("DISCORD_GUILD_ID");
+const { db } = createDatabase(databaseUrl);
+const authRepository = createAuthRepository(db);
+const client = new Client({ intents: [GatewayIntentBits.Guilds] });
+
+client.once(Events.ClientReady, (readyClient) => {
+  console.log(`Discord bot ready as ${readyClient.user.tag}`);
+});
+
+client.on(Events.InteractionCreate, async (interaction) => {
+  if (!interaction.isChatInputCommand()) return;
+  if (!commandNames.includes(interaction.commandName as (typeof commandNames)[number])) return;
+
+  await interaction.deferReply({ ephemeral: true });
+
+  try {
+    if (interaction.guildId !== discordGuildId) {
+      await interaction.editReply("This command is only available in the configured community server.");
+      return;
+    }
+
+    const magicLink = await createMagicLink(
+      {
+        id: interaction.user.id,
+        username: interaction.user.username,
+        globalName: interaction.user.globalName,
+      },
+      { repository: authRepository, appUrl },
+    );
+
+    await recordEvent(db, {
+      type: "games.minecraft.account-manager.auth.magic-link.created",
+      source: "/discord-bot",
+      subject: `discord-user/${interaction.user.id}`,
+      data: { command: interaction.commandName, guildId: interaction.guildId },
+    });
+
+    const row = new ActionRowBuilder<ButtonBuilder>().addComponents(
+      new ButtonBuilder()
+        .setLabel(interaction.commandName === "register" ? "Start registration" : "Open my account")
+        .setStyle(ButtonStyle.Link)
+        .setURL(magicLink.url),
+    );
+
+    await interaction.editReply({
+      content: "This private link works once and expires in 10 minutes. Do not share it.",
+      components: [row],
+    });
+  } catch (error) {
+    if (error instanceof LoginRateLimitedError) {
+      await interaction.editReply("Please wait 30 seconds before requesting another private account link.");
+      return;
+    }
+    console.error("Failed to create Discord account link", error);
+    await interaction.editReply("I could not create an account link. Please try again shortly.");
+  }
+});
+
+await client.login(token);