feat: initialize booster role bot with database and Discord integration

- Add drizzle configuration for SQLite database
- Create package.json with necessary dependencies and scripts
- Implement configuration loading for Discord bot
- Define permissions for roles
- Set up database schema for booster roles
- Create Discord client and commands for managing booster roles
- Handle guild member updates to manage roles based on boost status
- Implement boost eligibility checks and role management logic
- Add tests for boost eligibility and role guards
- Create service for managing booster roles with in-memory storage for testing
- Configure TypeScript settings for the project

.env.example

@@ -0,0 +1,5 @@
+DISCORD_TOKEN=
+DISCORD_CLIENT_ID=
+DISCORD_GUILD_ID=
+DATABASE_URL=file:./data/booster-role.sqlite
+BOOSTER_ROLE_ANCHOR_ROLE_ID=

.gitignore

@@ -0,0 +1,2 @@
+node_modules/
+.env

bun.lock

@@ -0,0 +1,336 @@
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+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "booster-role-bot",
+      "dependencies": {
+        "@discordjs/builders": "latest",
+        "better-sqlite3": "latest",
+        "discord.js": "latest",
+        "drizzle-orm": "latest",
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+        "@types/bun": "^1.3.14",
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+}

drizzle.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from "drizzle-kit";
+
+export default defineConfig({
+  schema: "./src/db/schema.ts",
+  out: "./src/db/migrations",
+  dialect: "sqlite",
+  dbCredentials: {
+    url: process.env.DATABASE_URL ?? "file:./data/booster-role.sqlite"
+  }
+});

package.json

@@ -0,0 +1,26 @@
+{
+  "name": "booster-role-bot",
+  "version": "0.1.0",
+  "type": "module",
+  "private": true,
+  "scripts": {
+    "dev": "bun run src/index.ts",
+    "test": "bun test",
+    "typecheck": "tsc --noEmit",
+    "lint": "tsc --noEmit",
+    "db:generate": "drizzle-kit generate",
+    "db:migrate": "drizzle-kit migrate"
+  },
+  "dependencies": {
+    "@discordjs/builders": "latest",
+    "better-sqlite3": "latest",
+    "discord.js": "latest",
+    "drizzle-orm": "latest"
+  },
+  "devDependencies": {
+    "@types/better-sqlite3": "latest",
+    "@types/bun": "^1.3.14",
+    "drizzle-kit": "latest",
+    "typescript": "latest"
+  }
+}

src/config/index.ts

@@ -0,0 +1,25 @@
+export type AppConfig = {
+  discordToken: string;
+  discordClientId: string;
+  discordGuildId: string;
+  databaseUrl: string;
+  boosterRoleAnchorRoleId: string | null;
+};
+
+export function loadConfig(env: Record<string, string | undefined> = process.env): AppConfig {
+  return {
+    discordToken: requireEnv(env, "DISCORD_TOKEN"),
+    discordClientId: requireEnv(env, "DISCORD_CLIENT_ID"),
+    discordGuildId: requireEnv(env, "DISCORD_GUILD_ID"),
+    databaseUrl: env.DATABASE_URL ?? "file:./data/booster-role.sqlite",
+    boosterRoleAnchorRoleId: env.BOOSTER_ROLE_ANCHOR_ROLE_ID ?? null
+  };
+}
+
+function requireEnv(env: Record<string, string | undefined>, key: string): string {
+  const value = env[key];
+  if (!value) {
+    throw new Error(`${key} is required`);
+  }
+  return value;
+}

src/config/permissions.ts

@@ -0,0 +1,12 @@
+export const forbiddenRolePermissions = [
+  "Administrator",
+  "ManageRoles",
+  "ManageChannels",
+  "BanMembers",
+  "KickMembers",
+  "MentionEveryone",
+  "ManageGuild",
+  "ManageWebhooks"
+] as const;
+
+export const cosmeticRolePermissions: string[] = [];

src/db/index.ts

@@ -0,0 +1,9 @@
+import Database from "better-sqlite3";
+import { drizzle } from "drizzle-orm/better-sqlite3";
+import * as schema from "./schema";
+
+export function createDb(databaseUrl: string) {
+  const sqlitePath = databaseUrl.replace(/^file:/, "");
+  const sqlite = new Database(sqlitePath);
+  return drizzle(sqlite, { schema });
+}

src/db/schema.ts

@@ -0,0 +1,21 @@
+import { integer, sqliteTable, text, uniqueIndex } from "drizzle-orm/sqlite-core";
+
+export const boosterRoles = sqliteTable(
+  "booster_roles",
+  {
+    guildId: text("guild_id").notNull(),
+    userId: text("user_id").notNull(),
+    roleId: text("role_id").notNull(),
+    name: text("name").notNull(),
+    color: text("color"),
+    createdAt: integer("created_at").notNull(),
+    updatedAt: integer("updated_at").notNull()
+  },
+  (table) => ({
+    userIdx: uniqueIndex("booster_roles_guild_user_idx").on(table.guildId, table.userId),
+    roleIdx: uniqueIndex("booster_roles_guild_role_idx").on(table.guildId, table.roleId)
+  })
+);
+
+export type BoosterRoleRow = typeof boosterRoles.$inferSelect;
+export type NewBoosterRoleRow = typeof boosterRoles.$inferInsert;

src/discord/client.ts

@@ -0,0 +1,7 @@
+import { Client, GatewayIntentBits } from "discord.js";
+
+export function createDiscordClient(): Client {
+  return new Client({
+    intents: [GatewayIntentBits.Guilds, GatewayIntentBits.GuildMembers]
+  });
+}

src/discord/commands/booster-role.ts

@@ -0,0 +1,25 @@
+import { SlashCommandBuilder } from "discord.js";
+
+export const boosterRoleCommand = new SlashCommandBuilder()
+  .setName("booster-role")
+  .setDescription("Manage your cosmetic booster role")
+  .addSubcommand((command) =>
+    command
+      .setName("claim")
+      .setDescription("Claim a new custom cosmetic booster role")
+      .addStringOption((option) => option.setName("name").setDescription("Role name").setRequired(true))
+      .addStringOption((option) => option.setName("color").setDescription("Hex color like #AABBCC"))
+  )
+  .addSubcommand((command) =>
+    command
+      .setName("rename")
+      .setDescription("Rename your bot-managed booster role")
+      .addStringOption((option) => option.setName("name").setDescription("New role name").setRequired(true))
+  )
+  .addSubcommand((command) =>
+    command
+      .setName("recolor")
+      .setDescription("Recolor your bot-managed booster role")
+      .addStringOption((option) => option.setName("color").setDescription("Hex color like #AABBCC").setRequired(true))
+  )
+  .addSubcommand((command) => command.setName("delete").setDescription("Delete your bot-managed booster role"));

src/discord/events/guildMemberUpdate.ts

@@ -0,0 +1,11 @@
+import type { GuildMember } from "discord.js";
+import type { BoosterRoleService } from "../../services/boosterRoleService";
+
+export async function handleGuildMemberUpdate(oldMember: GuildMember, newMember: GuildMember, service: BoosterRoleService): Promise<void> {
+  const hadBoost = Boolean(oldMember.premiumSince);
+  const hasBoost = Boolean(newMember.premiumSince);
+
+  if (hadBoost && !hasBoost) {
+    await service.removeRoleForLostBoost({ guildId: newMember.guild.id, userId: newMember.id });
+  }
+}

src/domain/boostEligibility.test.ts

@@ -0,0 +1,18 @@
+import { describe, expect, test } from "bun:test";
+import { assertBoostEligibility } from "./boostEligibility";
+
+describe("boost eligibility", () => {
+  test("allows users with at least two verified boosts", () => {
+    expect(() => assertBoostEligibility({ verifiedBoostCount: 2 })).not.toThrow();
+    expect(() => assertBoostEligibility({ verifiedBoostCount: 3 })).not.toThrow();
+  });
+
+  test("rejects users below two verified boosts", () => {
+    expect(() => assertBoostEligibility({ verifiedBoostCount: 1 })).toThrow("two server boosts");
+    expect(() => assertBoostEligibility({ verifiedBoostCount: 0 })).toThrow("two server boosts");
+  });
+
+  test("fails closed when boost count is not verifiable", () => {
+    expect(() => assertBoostEligibility({ verifiedBoostCount: null })).toThrow("Boost eligibility cannot be verified");
+  });
+});

src/domain/boostEligibility.ts

@@ -0,0 +1,13 @@
+export type BoostEligibilityInput = {
+  verifiedBoostCount: number | null;
+};
+
+export function assertBoostEligibility(input: BoostEligibilityInput): void {
+  if (input.verifiedBoostCount === null) {
+    throw new Error("Boost eligibility cannot be verified");
+  }
+
+  if (input.verifiedBoostCount < 2) {
+    throw new Error("User must have at least two server boosts to claim a custom role");
+  }
+}

src/domain/roleGuards.test.ts

@@ -0,0 +1,67 @@
+import { describe, expect, test } from "bun:test";
+import {
+  assertCanManageStoredRole,
+  assertCosmeticPermissions,
+  assertRoleNameIsAvailable,
+  assertRolePositionIsSafe,
+  normalizeHexColor,
+  validateRoleName
+} from "./roleGuards";
+
+const dangerousPermissions = [
+  "Administrator",
+  "ManageRoles",
+  "ManageChannels",
+  "BanMembers",
+  "KickMembers",
+  "MentionEveryone",
+  "ManageGuild",
+  "ManageWebhooks"
+];
+
+describe("role guards", () => {
+  test("rejects claiming a name already used by an unmanaged role", () => {
+    expect(() =>
+      assertRoleNameIsAvailable("VIP", [
+        { id: "role-1", name: "VIP" },
+        { id: "role-2", name: "Member" }
+      ])
+    ).toThrow("Role name is already used");
+  });
+
+  test("allows managing only the role stored for the requesting user", () => {
+    expect(() =>
+      assertCanManageStoredRole(
+        { guildId: "guild", userId: "user", roleId: "managed-role" },
+        { guildId: "guild", userId: "attacker", roleId: "managed-role" }
+      )
+    ).toThrow("Role is not owned by this user");
+
+    expect(() =>
+      assertCanManageStoredRole(
+        { guildId: "guild", userId: "user", roleId: "managed-role" },
+        { guildId: "guild", userId: "user", roleId: "other-role" }
+      )
+    ).toThrow("Role is not bot-managed");
+  });
+
+  test("rejects dangerous permissions", () => {
+    for (const permission of dangerousPermissions) {
+      expect(() => assertCosmeticPermissions([permission])).toThrow("Booster roles must be cosmetic");
+    }
+  });
+
+  test("rejects role positions at or above the anchor role", () => {
+    expect(() => assertRolePositionIsSafe(10, 10)).toThrow("Role position is not safe");
+    expect(() => assertRolePositionIsSafe(11, 10)).toThrow("Role position is not safe");
+    expect(() => assertRolePositionIsSafe(9, 10)).not.toThrow();
+  });
+
+  test("validates role names and hex colors", () => {
+    expect(validateRoleName("  My Booster Role  ")).toBe("My Booster Role");
+    expect(() => validateRoleName("@everyone")).toThrow("Role name is not allowed");
+    expect(() => validateRoleName("ab")).toThrow("Role name must be 3-32 characters");
+    expect(normalizeHexColor("#aabbcc")).toBe("#AABBCC");
+    expect(() => normalizeHexColor("blue")).toThrow("Color must be a hex value");
+  });
+});

src/domain/roleGuards.ts

@@ -0,0 +1,80 @@
+export type ExistingRole = {
+  id: string;
+  name: string;
+};
+
+import { forbiddenRolePermissions } from "../config/permissions";
+
+export type ManagedRoleIdentity = {
+  guildId: string;
+  userId: string;
+  roleId: string;
+};
+
+const forbiddenPermissions = new Set<string>(forbiddenRolePermissions);
+const reservedRoleNames = new Set(["@everyone", "here", "everyone"]);
+
+export function assertRoleNameIsAvailable(name: string, existingRoles: ExistingRole[]): void {
+  const normalizedName = normalizeName(name);
+  const hasUnmanagedRoleName = existingRoles.some((role) => normalizeName(role.name) === normalizedName);
+
+  if (hasUnmanagedRoleName) {
+    throw new Error("Role name is already used by an existing server role");
+  }
+}
+
+export function assertCanManageStoredRole(stored: ManagedRoleIdentity, requested: ManagedRoleIdentity): void {
+  if (stored.guildId !== requested.guildId) {
+    throw new Error("Role is not bot-managed in this guild");
+  }
+
+  if (stored.userId !== requested.userId) {
+    throw new Error("Role is not owned by this user");
+  }
+
+  if (stored.roleId !== requested.roleId) {
+    throw new Error("Role is not bot-managed for this user");
+  }
+}
+
+export function assertCosmeticPermissions(permissions: string[]): void {
+  const hasDangerousPermission = permissions.some((permission) => forbiddenPermissions.has(permission));
+
+  if (hasDangerousPermission) {
+    throw new Error("Booster roles must be cosmetic and cannot grant elevated permissions");
+  }
+}
+
+export function assertRolePositionIsSafe(targetPosition: number, anchorPosition: number): void {
+  if (targetPosition >= anchorPosition) {
+    throw new Error("Role position is not safe for a cosmetic booster role");
+  }
+}
+
+export function validateRoleName(name: string): string {
+  const trimmedName = name.trim();
+
+  if (trimmedName.length < 3 || trimmedName.length > 32) {
+    throw new Error("Role name must be 3-32 characters");
+  }
+
+  if (reservedRoleNames.has(normalizeName(trimmedName)) || trimmedName.includes("@")) {
+    throw new Error("Role name is not allowed");
+  }
+
+  return trimmedName;
+}
+
+export function normalizeHexColor(color: string): `#${string}` {
+  const normalizedColor = color.trim().toUpperCase();
+
+  if (!/^#[0-9A-F]{6}$/.test(normalizedColor)) {
+    throw new Error("Color must be a hex value like #AABBCC");
+  }
+
+  return normalizedColor as `#${string}`;
+}
+
+function normalizeName(name: string): string {
+  return name.trim().toLowerCase();
+}

src/index.ts

@@ -0,0 +1,11 @@
+import { loadConfig } from "./config";
+import { createDiscordClient } from "./discord/client";
+
+const config = loadConfig();
+const client = createDiscordClient();
+
+client.once("ready", () => {
+  console.log(`Logged in as ${client.user?.tag ?? "unknown bot"}`);
+});
+
+await client.login(config.discordToken);

src/services/boosterRoleService.test.ts

@@ -0,0 +1,105 @@
+import { describe, expect, test } from "bun:test";
+import { BoosterRoleService, type BoosterRoleRecord, type RoleRepository } from "./boosterRoleService";
+
+class MemoryRoleStore {
+  private records = new Map<string, BoosterRoleRecord>();
+
+  async findByUser(guildId: string, userId: string): Promise<BoosterRoleRecord | null> {
+    return this.records.get(`${guildId}:${userId}`) ?? null;
+  }
+
+  async create(record: BoosterRoleRecord): Promise<void> {
+    this.records.set(`${record.guildId}:${record.userId}`, record);
+  }
+
+  async delete(guildId: string, userId: string): Promise<void> {
+    this.records.delete(`${guildId}:${userId}`);
+  }
+}
+
+class FakeRoleRepository implements RoleRepository {
+  roles = new Map<string, { id: string; name: string; permissions: string[]; position: number; color: string | null }>();
+  deletedRoleIds: string[] = [];
+
+  constructor(initialRoles = [{ id: "existing-vip", name: "VIP", permissions: [], position: 1, color: null }]) {
+    for (const role of initialRoles) {
+      this.roles.set(role.id, role);
+    }
+  }
+
+  async listRoles() {
+    return [...this.roles.values()];
+  }
+
+  async createRole(input: { name: string; color: string | null; permissions: string[]; position: number }) {
+    const id = `created-${this.roles.size + 1}`;
+    this.roles.set(id, { id, ...input });
+    return { id };
+  }
+
+  async updateRole(roleId: string, input: { name?: string; color?: string | null }) {
+    const role = this.roles.get(roleId);
+    if (!role) throw new Error("Role does not exist");
+    this.roles.set(roleId, { ...role, ...input });
+  }
+
+  async deleteRole(roleId: string) {
+    this.deletedRoleIds.push(roleId);
+    this.roles.delete(roleId);
+  }
+}
+
+describe("BoosterRoleService", () => {
+  test("eligible user claims one new cosmetic managed role", async () => {
+    const store = new MemoryRoleStore();
+    const roles = new FakeRoleRepository();
+    const service = new BoosterRoleService(store, roles, { anchorPosition: 10 });
+
+    const claimed = await service.claimRole({ guildId: "guild", userId: "user", name: "My Role", color: "#aabbcc", verifiedBoostCount: 2 });
+
+    expect(claimed.roleId).toBe("created-2");
+    expect(roles.roles.get(claimed.roleId)?.permissions).toEqual([]);
+    expect(roles.roles.get(claimed.roleId)?.position).toBe(9);
+    expect(await store.findByUser("guild", "user")).toEqual(claimed);
+  });
+
+  test("rejects claiming an existing unmanaged role name", async () => {
+    const service = new BoosterRoleService(new MemoryRoleStore(), new FakeRoleRepository(), { anchorPosition: 10 });
+
+    await expect(service.claimRole({ guildId: "guild", userId: "user", name: "vip", color: null, verifiedBoostCount: 2 })).rejects.toThrow("already used");
+  });
+
+  test("rejects duplicate claims instead of creating another role", async () => {
+    const store = new MemoryRoleStore();
+    const roles = new FakeRoleRepository();
+    const service = new BoosterRoleService(store, roles, { anchorPosition: 10 });
+
+    await service.claimRole({ guildId: "guild", userId: "user", name: "First Role", color: null, verifiedBoostCount: 2 });
+
+    await expect(service.claimRole({ guildId: "guild", userId: "user", name: "Second Role", color: null, verifiedBoostCount: 2 })).rejects.toThrow("already has a booster role");
+  });
+
+  test("renames only the stored role owned by the user", async () => {
+    const store = new MemoryRoleStore();
+    const roles = new FakeRoleRepository([]);
+    const service = new BoosterRoleService(store, roles, { anchorPosition: 10 });
+    const claimed = await service.claimRole({ guildId: "guild", userId: "user", name: "First Role", color: null, verifiedBoostCount: 2 });
+
+    await service.renameRole({ guildId: "guild", userId: "user", name: "Renamed" });
+
+    expect(roles.roles.get(claimed.roleId)?.name).toBe("Renamed");
+    await expect(service.renameRole({ guildId: "guild", userId: "attacker", name: "Stolen" })).rejects.toThrow("No booster role found");
+  });
+
+  test("removes managed role when eligibility is lost", async () => {
+    const store = new MemoryRoleStore();
+    const roles = new FakeRoleRepository([]);
+    const service = new BoosterRoleService(store, roles, { anchorPosition: 10 });
+    const claimed = await service.claimRole({ guildId: "guild", userId: "user", name: "First Role", color: null, verifiedBoostCount: 2 });
+
+    await service.removeRoleForLostBoost({ guildId: "guild", userId: "user" });
+
+    expect(roles.deletedRoleIds).toEqual([claimed.roleId]);
+    expect(await store.findByUser("guild", "user")).toBeNull();
+  });
+});

src/services/boosterRoleService.ts

@@ -0,0 +1,124 @@
+import { assertBoostEligibility } from "../domain/boostEligibility";
+import {
+  assertRoleNameIsAvailable,
+  assertRolePositionIsSafe,
+  normalizeHexColor,
+  validateRoleName,
+  type ExistingRole
+} from "../domain/roleGuards";
+
+export type BoosterRoleRecord = {
+  guildId: string;
+  userId: string;
+  roleId: string;
+  name: string;
+  color: string | null;
+  createdAt: number;
+  updatedAt: number;
+};
+
+export type BoosterRoleStore = {
+  findByUser(guildId: string, userId: string): Promise<BoosterRoleRecord | null>;
+  create(record: BoosterRoleRecord): Promise<void>;
+  delete(guildId: string, userId: string): Promise<void>;
+};
+
+export type RoleRepository = {
+  listRoles(): Promise<ExistingRole[]>;
+  createRole(input: { name: string; color: string | null; permissions: string[]; position: number }): Promise<{ id: string }>;
+  updateRole(roleId: string, input: { name?: string; color?: string | null }): Promise<void>;
+  deleteRole(roleId: string): Promise<void>;
+};
+
+export type BoosterRoleServiceOptions = {
+  anchorPosition: number;
+  now?: () => number;
+};
+
+export class BoosterRoleService {
+  private readonly now: () => number;
+
+  constructor(
+    private readonly store: BoosterRoleStore,
+    private readonly roles: RoleRepository,
+    private readonly options: BoosterRoleServiceOptions
+  ) {
+    this.now = options.now ?? Date.now;
+  }
+
+  async claimRole(input: {
+    guildId: string;
+    userId: string;
+    name: string;
+    color: string | null;
+    verifiedBoostCount: number | null;
+  }): Promise<BoosterRoleRecord> {
+    const { guildId, userId, verifiedBoostCount } = input;
+    assertBoostEligibility({ verifiedBoostCount });
+
+    const existingRecord = await this.store.findByUser(guildId, userId);
+    if (existingRecord) {
+      throw new Error("User already has a booster role");
+    }
+
+    const name = validateRoleName(input.name);
+    const color = input.color ? normalizeHexColor(input.color) : null;
+    assertRoleNameIsAvailable(name, await this.roles.listRoles());
+
+    const position = this.options.anchorPosition - 1;
+    assertRolePositionIsSafe(position, this.options.anchorPosition);
+
+    const role = await this.roles.createRole({ name, color, permissions: [], position });
+    const timestamp = this.now();
+    const record = {
+      guildId,
+      userId,
+      roleId: role.id,
+      name,
+      color,
+      createdAt: timestamp,
+      updatedAt: timestamp
+    };
+
+    await this.store.create(record);
+    return record;
+  }
+
+  async renameRole(input: { guildId: string; userId: string; name: string }): Promise<void> {
+    const { guildId, userId } = input;
+    const record = await this.getUserRecord(guildId, userId);
+    const name = validateRoleName(input.name);
+    assertRoleNameIsAvailable(name, (await this.roles.listRoles()).filter((role) => role.id !== record.roleId));
+    await this.roles.updateRole(record.roleId, { name });
+  }
+
+  async recolorRole(input: { guildId: string; userId: string; color: string }): Promise<void> {
+    const { guildId, userId, color } = input;
+    const record = await this.getUserRecord(guildId, userId);
+    await this.roles.updateRole(record.roleId, { color: normalizeHexColor(color) });
+  }
+
+  async deleteRole(input: { guildId: string; userId: string }): Promise<void> {
+    const { guildId, userId } = input;
+    const record = await this.getUserRecord(guildId, userId);
+    await this.roles.deleteRole(record.roleId);
+    await this.store.delete(guildId, userId);
+  }
+
+  async removeRoleForLostBoost(input: { guildId: string; userId: string }): Promise<void> {
+    const { guildId, userId } = input;
+    const record = await this.store.findByUser(guildId, userId);
+    if (!record) return;
+
+    await this.roles.deleteRole(record.roleId);
+    await this.store.delete(guildId, userId);
+  }
+
+  private async getUserRecord(guildId: string, userId: string): Promise<BoosterRoleRecord> {
+    const record = await this.store.findByUser(guildId, userId);
+    if (!record) {
+      throw new Error("No booster role found for this user");
+    }
+    return record;
+  }
+}

tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "strict": true,
+    "skipLibCheck": true,
+    "types": ["bun"],
+    "noEmit": true
+  },
+  "include": ["src/**/*.ts", "drizzle.config.ts"]
+}