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src/api/bot/core.ts

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+import * as EventEmitter from 'events';
+import * as bcrypt from 'bcryptjs';
+
+import User, { IUser } from '../models/user';
+
+export default class BotCore extends EventEmitter {
+	public user: IUser;
+
+	private context: Context = null;
+
+	constructor(user: IUser) {
+		super();
+
+		this.user = user;
+	}
+
+	public async q(query: string): Promise<string> {
+		if (this.context != null) {
+			return await this.context.q(query);
+		}
+
+		switch (query) {
+			case 'ping':
+				return 'PONG';
+			case 'ログイン':
+			case 'サインイン':
+				this.context = new SigninContext(this);
+				return await this.context.greet();
+			default:
+				return '?';
+		}
+	}
+
+	public setUser(user: IUser) {
+		this.user = user;
+		this.emit('set-user', user);
+	}
+}
+
+abstract class Context {
+	protected core: BotCore;
+
+	public abstract async greet(): Promise<string>;
+	public abstract async q(query: string): Promise<string>;
+
+	constructor(core: BotCore) {
+		this.core = core;
+	}
+}
+
+class SigninContext extends Context {
+	private temporaryUser: IUser;
+
+	public async greet(): Promise<string> {
+		return 'まずユーザー名を教えてください:';
+	}
+
+	public async q(query: string): Promise<string> {
+		if (this.temporaryUser == null) {
+			// Fetch user
+			const user: IUser = await User.findOne({
+				username_lower: query.toLowerCase()
+			}, {
+				fields: {
+					data: false,
+					profile: false
+				}
+			});
+
+			if (user === null) {
+				return `${query}というユーザーは存在しませんでした... もう一度教えてください:`;
+			} else {
+				this.temporaryUser = user;
+				return `パスワードを教えてください:`;
+			}
+		} else {
+			// Compare password
+			const same = bcrypt.compareSync(query, this.temporaryUser.password);
+
+			if (same) {
+				this.core.setUser(this.temporaryUser);
+				return `${this.temporaryUser.name}さん、おかえりなさい！`;
+			} else {
+				return `パスワードが違います... もう一度教えてください:`;
+			}
+		}
+	}
+}