create project

.gitignore

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+.vercel
+node_modules

README.md

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+# だらずさん GPT
+
+GPT 版だらずさん
+
+## インストール
+
+Step 1
+: Vercel へのデプロイ
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/clone?repository-url=https%3A%2F%2Fgithub.com%2Fkou029w%2Fdaraz-gpt)
+
+Step 2
+: Slack アプリの作成
+
+[Slack Applications](https://api.slack.com/apps) → Create New App → From an app manifest
+
+下記の Manifest をコピペして、Slack アプリを作成します。
+
+```yaml
+display_information:
+  name: daraz-gpt
+features:
+  bot_user:
+    display_name: daraz-gpt
+oauth_config:
+  scopes:
+    bot:
+      - app_mentions:read
+      - chat:write
+settings:
+  event_subscriptions:
+    request_url: https://daraz-gpt.vercel.app/api/slack/events
+    bot_events:
+      - app_mention
+```
+
+Step 3
+: 環境変数の設定
+
+[Vercel Dashboard](https://vercel.com/dashboard) → 対象のプロジェクト → Settings → Environment Variables
+
+- `SLACK_BOT_TOKEN` ... [Slack Applications](https://api.slack.com/apps) → "daraz-gpt" → Permissions ページにある `xoxb-` から始まるボットトークン
+- `SLACK_SIGNING_SECRET` ... [Slack Applications](https://api.slack.com/apps) → "daraz-gpt" → Basic Information ページにある Signing Secret
+- `OPENAI_API_KEY` … [OpenAI API Key](https://beta.openai.com/account/api-keys)
+
+## ライセンス
+
+WTFPL

api/slack/events.ts

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+import { App, AwsLambdaReceiver } from "@slack/bolt";
+import type { AwsHandler } from "@slack/bolt/dist/receivers/AwsLambdaReceiver";
+
+const openaiApiKey = process.env.OPENAI_API_KEY ?? "";
+
+async function gpt(prompt: string): Promise<string> {
+  const endpoint = "https://api.openai.com/v1/completions";
+  const body = {
+    model: "text-davinci-003",
+    prompt,
+    temperature: 0.5,
+    max_tokens: 2048,
+  };
+  const res = await fetch(endpoint, {
+    method: "POST",
+    headers: {
+      "content-type": "application/json",
+      authorization: `Bearer ${openaiApiKey}`,
+    },
+    body: JSON.stringify(body),
+  });
+  const json = await res.json();
+  return json.choices[0].text.trim();
+}
+
+const token = process.env.SLACK_BOT_TOKEN ?? "";
+const signingSecret = process.env.SLACK_SIGNING_SECRET ?? "";
+const receiver = new AwsLambdaReceiver({ signingSecret });
+const awsHandler = receiver.toHandler();
+const app = new App({ token, receiver });
+
+// required app_mentions:read chat:write
+app.event("app_mention", async ({ event, say }) => {
+  const prompt = `語尾を「にゃん」に。${event.text
+    .replace(/<@[0-9A-Z]+>/, "")
+    .trim()}`;
+  const text = await gpt(prompt);
+  await say(text);
+});
+
+export const handler: AwsHandler = async (event, context, callback) => {
+  // AWS Lambda ウォームアップ時に発生しうるタイムアウトを無視
+  if (event.headers["x-slack-retry-reason"] === "http_timeout") {
+    return { statusCode: 200, body: "OK" };
+  }
+  return await awsHandler(event, context, callback);
+};

package.json

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+{
+  "name": "daraz-gpt",
+  "version": "0.0.0",
+  "private": true,
+  "dependencies": {
+    "@slack/bolt": "^3.12.2"
+  },
+  "devDependencies": {
+    "vercel": "^28.14.0"
+  }
+}

public/index.txt

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+OK

renovate.json

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:base", "config:semverAllMonthly", ":automergeMinor"]
+}

vercel.json

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+{
+  "build": {
+    "env": {
+      "NODEJS_AWS_HANDLER_NAME": "handler"
+    }
+  }
+}