From dab55685deda41e8cac6a9a64d5c4d3edd0d4f5c Mon Sep 17 00:00:00 2001
From: jimmytai <jimmytai@ionexenergy.com>
Date: Wed, 17 Jul 2024 17:01:28 +0800
Subject: [PATCH] replyCalc

---
 line/handler/index.js     |  1 +
 line/handler/replyCalc.js | 15 +++++++++++++++
 2 files changed, 16 insertions(+)
 create mode 100644 line/handler/replyCalc.js

diff --git a/line/handler/index.js b/line/handler/index.js
index 817f2d4..6759870 100644
--- a/line/handler/index.js
+++ b/line/handler/index.js
@@ -8,6 +8,7 @@ const lineEventHander = middlewareCompose([
   require('./cmd'), // 處理指令
   require('./replyFlexFromText'), // 嘗試回傳 flex
   require('./noReplyUrl'), // 如果是一個合法的 URL 就不作回應
+  require('./replyCalc'), // 計算數學式
   require('./replyEventJson'), // 把事件用 json 回傳
 ])
 
diff --git a/line/handler/replyCalc.js b/line/handler/replyCalc.js
new file mode 100644
index 0000000..52c74d3
--- /dev/null
+++ b/line/handler/replyCalc.js
@@ -0,0 +1,15 @@
+const _ = require('lodash')
+const msgText = require('../msg/text')
+
+module.exports = async (ctx, next) => {
+  const text = ctx?.event?.message?.text
+  try {
+    if (!_.isString(text)) throw new Error('Not a string')
+    if (/[^0-9!.()*/&%^+<>|~A-Fa-fnoOxX -]/.test(text)) throw new Error('Not a arithmetic string')
+    const result = new Function(`return ${text}`)() // eslint-disable-line no-new-func
+    await ctx.replyMessage(msgText(`${result}`))
+  } catch (err) {
+    // console.log(err)
+    return await next()
+  }
+}