やった

src/api/service/github.ts

@@ -1,10 +1,22 @@
 import * as express from 'express';
 const createHandler = require('github-webhook-handler');
+import User from '../models/user';
 import config from '../../conf';
 
-module.exports = (app: express.Application) => {
+module.exports = async (app: express.Application) => {
 	if (config.github_bot == null) return;
 
+	const bot = await User.findOne({
+		username_lower: config.github_bot.username.toLowerCase()
+	});
+
+	if (bot == null) {
+		console.warn(`GitHub hook bot specified, but not found: @${config.github_bot.username}`);
+		return;
+	}
+
+	const post = text => require('../endpoints/posts/create')({ text }, bot);
+
 	const handler = createHandler({
 		path: '/hooks/github',
 		secret: config.github_bot.hook_secret
@@ -15,4 +27,15 @@ module.exports = (app: express.Application) => {
 	handler.on('*', event => {
 		console.dir(event);
 	});
+
+	handler.on('issues', event => {
+		let title: string;
+		switch (event.payload.action) {
+			case 'opened': title = 'Issueが立ちました'; break;
+			case 'closed': title = 'Issueが閉じられました'; break;
+			case 'reopened': title = 'Issueが開きました'; break;
+		}
+		const text = `${title}: ${event.payload.issue.number}「${event.payload.issue.title}」\n${event.payload.issue.url}`;
+		post(text);
+	});
 };

src/config.ts

@@ -63,7 +63,7 @@ interface ISource {
 	};
 	github_bot?: {
 		hook_secret: string;
-		bot_token: string;
+		username: string;
 	};
 }