Add Node.js client

nodejs/src/commands/base-command.ts

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+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+export class Context {}
+
+export class Interaction {
+  constructor(input: string) {
+    this.input = input;
+    this.options = {};
+  }
+  input: string;
+  output?: string;
+  options: any;
+}
+
+export interface Command {
+  name: string;
+  follow: (interaction: Interaction) => number;
+  run: (ctx: Context, interaction: Interaction) => string | Promise<string>;
+}

nodejs/src/commands/index.ts

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+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import { log } from '../utils/log';
+import { Interaction, Command, Context } from './base-command';
+import rsp from './rock-scissors-paper';
+import stock from './stock';
+
+let commands: Command[] = [rsp, stock];
+
+export const handleCommand = async (ctx: Context, input: string): Promise<string> => {
+  const interaction = new Interaction(input);
+  const choice = commands
+    .map((c) => {
+      return { score: c.follow(interaction), command: c };
+    })
+    ?.sort((a, b) => {
+      return a.score - b.score;
+    })
+    ?.filter((x) => x.score > 0)
+    ?.pop();
+
+  if (!choice) {
+    log.debug('no command found');
+    return '';
+  }
+  const reply = await choice.command.run(ctx, interaction);
+  return reply;
+};

nodejs/src/commands/rock-scissors-paper.ts

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+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+import { log } from '../utils/log';
+import { Interaction, Command, Context } from './base-command';
+
+function RandomNum(max: number): number {
+  return Math.floor(Math.random() * (max + 1));
+}
+
+const keywords = ['rock', 'paper', 'scissors'];
+
+export default {
+  name: 'rock-scissors-paper',
+  follow: (interaction: Interaction): number => {
+    const i = keywords.find((k) => {
+      return interaction.input.includes(k);
+    });
+    log.debug(`rock-scissors-paper follow-up: ${i}`);
+    interaction.options.pick = i ?? undefined;
+    return i ? 1 : 0;
+  },
+  run: (ctx: Context, interaction: Interaction): string => {
+    const pick: string = interaction.options.pick as string;
+
+    const playerPick = keywords.findIndex((x) => x == pick);
+    const botPick = RandomNum(2);
+
+    let result = 'tied';
+
+    if (playerPick == botPick) result = 'Tied';
+    else if (playerPick == 0 && botPick == 2) result = 'Win';
+    else if ((playerPick - botPick) % 3 == 1) result = 'Win';
+    else result = 'Lose';
+
+    const content = `You picked **${pick}** and I picked **${keywords[botPick]}**, You **${result}**`;
+    return content;
+  }
+} as Command;

nodejs/src/commands/stock.ts

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+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+import { stocks } from 'stock-api';
+import { Interaction, Command, Context } from './base-command';
+
+function getPrice(code: string): Promise<string> {
+  return stocks.tencent.getStocks([code]).then((res) => {
+    return JSON.stringify(res[0]);
+  });
+}
+
+export default {
+  name: 'stock',
+  follow: (interaction: Interaction): number => {
+    let match = /(S[HZ]\d{6})/.exec(interaction.input);
+    if (match) {
+      let stock = match && match[0];
+      interaction.options.stock = stock;
+      return 1;
+    }
+    return 0;
+  },
+  run: async (ctx: Context, interaction: Interaction): Promise<string> => {
+    const pick: string = interaction.options.stock as string;
+    const content = await getPrice(pick);
+    return content;
+  }
+} as Command;