From fc76e01fc6ab49f5e7d7106945713cb96a4dffcb Mon Sep 17 00:00:00 2001
From: Foteini Giannaropoulou <giannaropoulou.foteini@gmail.com>
Date: Mon, 22 Jun 2020 01:36:02 +0300
Subject: [PATCH] Add '/dt' slash command

---
 app.js            |  8 +++++-
 lib/slack_time.js | 65 ++++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 69 insertions(+), 4 deletions(-)

diff --git a/app.js b/app.js
index 5e282b8..883d423 100644
--- a/app.js
+++ b/app.js
@@ -23,9 +23,15 @@ app.use(bodyParser.json());
 app.use(bodyParser.urlencoded({ extended: false }));
 
 app.use('/slack/receive', slash({
-  handler: SlackTime,
+  handler: SlackTime.getSlackMessageWithChannelTimezones,
   token: process.env.SLACK_SLASH_TOKEN
 }));
+
+app.use('/slack/receive_dt', slash({
+  handler: SlackTime.getSlackMessageWithLocalTime,
+  token: process.env.SLACK_SLASH_TOKEN
+}));
+
 app.use('/slack', auth({
   clientId: process.env.SLACK_CLIENT_ID,
   clientSecret: process.env.SLACK_CLIENT_SECRET,
diff --git a/lib/slack_time.js b/lib/slack_time.js
index 7fef9e8..4659764 100644
--- a/lib/slack_time.js
+++ b/lib/slack_time.js
@@ -12,7 +12,9 @@ var logger = require('../lib/logger');
 var NodeCache = require('node-cache');
 var unknownRecipientMessageCache = new NodeCache();
 
-module.exports = SlackTime = function (args) {
+module.exports = SlackTime = {};
+
+SlackTime.getSlackMessageWithChannelTimezones = function (args) {
   var token = args.apiToken;
   var originalMessage = args.message;
   var currentUserId = args.currentUserId;
@@ -64,7 +66,25 @@ module.exports = SlackTime = function (args) {
     var message = addTimezonesToSlackMessage(originalMessage, userInfo, zones);
     return postToSlack(channelId, userInfo, message, token);
   });
-}
+};
+
+SlackTime.getSlackMessageWithLocalTime = function (args) {
+  var token = args.apiToken;
+  var originalMessage = args.message;
+  var currentUserId = args.currentUserId;
+  var teamId = args.teamId;
+  var channelId = args.channelId;
+
+  return getUserList(token)
+  .then(parseUserList)
+  .then(function (userList) {
+    var userInfo = currentUserInfo(userList.members, currentUserId);
+
+    var message = addLocalTimeToSlackMessage(originalMessage, userInfo);
+
+    return postToSlack(channelId, userInfo, message, token);
+  });
+};
 
 SlackTime.requiredOAuthScopes = "users:read,chat:write:bot,channels:read,commands";
 
@@ -121,7 +141,7 @@ function updateChannelAndProcessOriginalMessage(args) {
   .then(function () {
     var originalMessage = unknownRecipientMessageCache.get(teamId + "|" + channelId);
     args.message = originalMessage;
-    return SlackTime(args);
+    return SlackTime.getSlackMessageWithChannelTimezones(args);
   });
 }
 
@@ -268,6 +288,23 @@ function formatChannelLocalTimes(startMoment, endMoment, userInfo, zones) {
   return times.join(", ");
 }
 
+function toSlackFormattedDate(unix, timeOnly) {
+  timeOnly = timeOnly || false;
+
+  return '<!date^' + unix + '^' + (timeOnly ? '{time}':'{date_short_pretty} {time}') + '|Unix:' + unix + '>';
+}
+
+function formatUserLocalTimes(startMoment, endMoment) {
+  var dateStartString = formatSlackDate(startMoment);
+  var startUnix = startMoment.unix();
+
+  var includeEndDate = endMoment && formatSlackDate(endMoment) !== dateStartString;
+
+  var formatted = toSlackFormattedDate(startUnix) + (endMoment ? ' to ' + toSlackFormattedDate(endMoment.unix(), !includeEndDate) : '');
+
+  return formatted;
+}
+
 function chronoResultToUtcMoment(result, userInfo) {
   if (!result) {
     return;
@@ -281,6 +318,14 @@ function chronoResultToUtcMoment(result, userInfo) {
   return dateMoment;
 }
 
+function chronoResultToMoment(result) {
+  if (!result) {
+    return;
+  }
+
+  return result.moment();
+}
+
 function addTimezonesToSlackMessage(message, userInfo, zones) {
   var ref = moment().add(-moment().utcOffset() + userInfo.timezoneOffset, 'minutes');
   var results = chrono.parse(message, ref);
@@ -295,6 +340,20 @@ function addTimezonesToSlackMessage(message, userInfo, zones) {
   return message;
 }
 
+function addLocalTimeToSlackMessage(message, userInfo) {
+
+  var ref = moment().add(-moment().utcOffset() + userInfo.timezoneOffset, 'minutes');
+  var results = chrono.parse(message, ref);
+
+  results.forEach(function(result) {
+    var userLocalTime = formatUserLocalTimes(chronoResultToMoment(result.start), chronoResultToMoment(result.end));
+    message = message.replace(result.text, result.text + ' (' + userLocalTime + ' _at your local time_)');
+  });
+
+  return message;
+}
+
+
 function sortObjectToArray(obj) {
   out = [];
   Object