first

.gitignore

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+node_modules
+.env
+package-lock.json

Dockerfile

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+FROM node:8
+LABEL maintainer="Jay <jie.chen@tw.viewsonic.com>"
+ENV NODE_PORT 5111
+RUN mkdir -p /data
+WORKDIR /data
+COPY . .
+RUN rm .env
+RUN npm install
+EXPOSE ${NODE_PORT}
+CMD ["npm", "start"]

app.js

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+const config = require('./config')
+const Koa = require('koa')
+const koaLogger = require('koa-logger')
+const router = require('./route')
+const app = new Koa()
+
+app.use(koaLogger())
+app.use(router.allowedMethods())
+app.use(router.routes())
+
+const server = app.listen(config.port, () => {
+  console.log(`server start on port ${server.address().port}`)
+})
+
+module.exports = server

config/index.js

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+module.exports = {
+  port: process.env.NODE_PORT || 10230,
+  line: {
+    secret: process.env.LINE_SECRET || '',
+    access: process.env.LINE_ACCESS || ''
+  }
+}

index.js

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+const fs = require('fs')
+const path = require('path')
+try {
+  fs.accessSync(path.resolve(__dirname, '.env'))
+  require('dotenv').config()
+} catch (err) {}
+require('./app')

libs/middleware/index.js

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+const config = require('../../config')
+const crypto = require('crypto')
+
+const verifyLine = async (c, n) => {
+  if (!('request' in c) || !('raw' in c.request)) return c.throw(400, 'body not found')
+  let xSignature = c.get('x-line-signature') || ''
+  if (typeof xSignature !== 'string' || xSignature.length === 0) return c.throw(400, 'signature not found')
+  let signature = crypto.createHmac('SHA256', config.line.secret).update(c.request.raw).digest('base64')
+  if (signature !== xSignature) return c.throw(403, 'signature not match')
+  return n()
+}
+
+module.exports = {
+  verifyLine
+}

package.json

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+{
+  "name": "mtfosbot",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js 2>&1 | tee runtime.txt",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "JayChen",
+  "license": "ISC",
+  "dependencies": {
+    "dotenv": "^6.0.0",
+    "koa": "^2.5.1",
+    "koa-body": "^4.0.3",
+    "koa-logger": "^3.2.0",
+    "koa-router": "^7.4.0"
+  },
+  "devDependencies": {
+    "standard": "^11.0.1"
+  }
+}

route/index.js

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+const Router = require('koa-router')
+const r = new Router()
+
+r.use('/line', require('./line').routes())
+
+module.exports = r

route/line/index.js

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+const Router = require('koa-router')
+const r = new Router()
+// const koaBody = require('koa-body')
+const rawBody = require('raw-body')
+const {
+  verifyLine
+} = require('../../libs/middleware')
+
+const getRaw = async (c, n) => {
+  let raw = await rawBody(c.req, {
+    length: c.request.length,
+    limit: '5mb',
+    encoding: c.request.charset
+  })
+  c.request.raw = raw
+  let txt = raw instanceof Buffer ? raw.toString() : raw
+  if (c.request.type === 'application/json') {
+    try {
+      c.request.body = JSON.parse(txt)
+    } catch (err) {
+      c.request.body = txt
+    }
+  }
+  return n()
+}
+
+r.post('/', getRaw, verifyLine, async (c, n) => {
+  console.log(c.request.body)
+  if (!('event' in c.request.body)) return c.throw(400, 'data struct error')
+  c.body = 'success'
+  c.status = 200
+})
+
+module.exports = r