init

lib/modules/utils.js

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+const _ = require('lodash')
+
+//
+// Declare utils object
+//
+const utils = {}
+
+//
+//
+//
+utils.chunk = function(body) {
+  //
+  // Use regex to create an array
+  // of strings of max length
+  //
+  return body.match(/[\s\S]{1,4000}/g)
+}
+
+//
+// Removes trailing /<string> suffixes that
+// may exist in the user ids. This happens
+// if a user logs in to jabber more than
+// once at the same time
+//
+utils.realJID = function (jid='') {
+  return jid.split('/')[0]
+    .replace(/\\20+/g, '.')
+    .replace(/\.\.+/, '.')
+}
+
+//
+// Lookup values
+//
+utils.lookup = function (type, map, key) {
+  var found = map[key]
+
+  if(!found) {
+    throw new Error(`${type} ${key} not found`)
+  }
+
+  return found
+}
+
+//
+// Obtain the username from a jid
+//
+utils.username = function (users, jid) {
+  return utils.lookup('user', users, utils.realJID(jid)).username
+}
+
+//
+// Obtain the channel name from a jid
+//
+utils.channelName = function (channels, jid) {
+  return utils.lookup('channel', channels, jid).name
+}
+
+//
+// Find the message body
+//
+utils.body = function (message) {
+  var body = message.body_string || message.body_text
+
+  if(!body) {
+    throw new Error(`message ${message.msg_id} body is empty`)
+  }
+
+  return utils.chunk(body)
+}
+
+//
+// Coverts the to / from JIDs to a members
+// array
+//
+utils.members = function(users, to, from) {
+  //
+  // We use uniq to remove duplicate
+  // members in the same channel
+  //
+  return _.uniq(_.sortBy([
+    utils.username(users, to),
+    utils.username(users, from),
+  ]))
+}
+
+//
+// Checks if the members list is valid
+//
+utils.membersAreValid = function(members) {
+  return _.isArray(members) && members.length > 1
+}
+
+//
+// Convert ISO to millis
+//
+utils.millis = function(date) {
+  return new Date(date).getTime()
+}
+
+//
+// Export the functions
+//
+module.exports = utils