add get line msg log api

libs/route-utils/index.js

@@ -134,11 +134,51 @@ const checkSession = async (c, n) => {
   return n()
 }
 
+/**
+ * @typedef pageobj
+ * @prop {number} totalPage
+ * @prop {number} offset
+ * @prop {number} limit
+ * @prop {number} page
+ */
+/**
+ * calculate page object
+ * @param {number} count data row count
+ * @param {number} page page
+ * @param {number} maxItem page show item limit
+ * @return {pageobj}
+ */
+const calPage = function (count, page, maxItem = 10) {
+  if (!count || !isFinite(count) || count < 0) count = 0
+  if (!page || !isFinite(page) || page < 1) page = 1
+  if (!maxItem || !isFinite(maxItem) || maxItem < 1) maxItem = 10
+
+  let totalPage = Math.ceil(count / maxItem)
+  if (totalPage < 1) totalPage = 1
+  if (page > totalPage) page = totalPage
+  let offset = (page - 1) * maxItem
+  if (offset > count) offset = count
+  let limit = maxItem
+
+  totalPage = toInt(totalPage)
+  offset = toInt(offset)
+  limit = toInt(limit)
+  page = toInt(page)
+
+  return {
+    totalPage,
+    offset,
+    limit,
+    page
+  }
+}
+
 module.exports = {
   chkObject,
   resObject,
   toInt,
   APIError,
   genError,
-  checkSession
+  checkSession,
+  calPage
 }

route/api/index.js

@@ -5,7 +5,9 @@ const {
   resObject,
   APIError,
   genError,
-  checkSession
+  checkSession,
+  calPage,
+  toInt
 } = require('@libs/route-utils')
 const DB = require('@libs/database')
 const r = new Router()
@@ -67,6 +69,36 @@ r.get('/session', checkSession, async (c, n) => {
   })
 })
 
+r.get('/line_msg', checkSession, async (c, n) => {
+  let p = toInt(c.query.p, 1, 1)
+
+  let text = `select count(*) as c from "public"."line_message_log"`
+  let msgCount = await c.db.query({text})
+  if (msgCount.rowCount === 0) throw genError('InternalError', 'database query fail')
+  if (!('c' in msgCount.rows[0])) throw genError('InternalError', 'database query fail')
+  let page = calPage(msgCount.rows[0].c, p, 20)
+  text = `select g.name, u.name as user, m.message, m.ctime from "public"."line_message_log" m
+    left join "public"."line_group" g
+    on g.id = m.group
+    left join "public"."line_user" u
+    on u.id = m.user
+    order by m.ctime desc
+    offset $1
+    limit $2`
+  let values = [page.offset, page.limit]
+  let msgData = await c.db.query({
+    text,
+    values
+  })
+  c.obj = resObject('Success', {
+    messages: msgData.rows,
+    page: {
+      cur: page.page,
+      total: page.totalPage
+    }
+  })
+})
+
 r.use('/twitch', require('./twitch').routes())
 
 module.exports = r