display retention policy and schedule in sites view

dashboard/src/models/BackupSitesModel.js

@@ -193,6 +193,57 @@ function create() {
   };
 }
 
+const backupRetentions = [
+  { name: '2 days', id: { keepWithinSecs: 2 * 24 * 60 * 60 }},
+  { name: '1 week', id: { keepWithinSecs: 7 * 24 * 60 * 60 }}, // default
+  { name: '1 month', id: { keepWithinSecs: 30 * 24 * 60 * 60 }},
+  { name: '3 months', id: { keepWithinSecs: 3 * 30 * 24 * 60 * 60 }},
+  { name: '2 daily, 4 weekly', id: { keepDaily: 2, keepWeekly: 4 }},
+  { name: '3 daily, 4 weekly, 6 monthly', id: { keepDaily: 3, keepWeekly: 4, keepMonthly: 6 }},
+  { name: '7 daily, 4 weekly, 12 monthly', id: { keepDaily: 7, keepWeekly: 4, keepMonthly: 12 }},
+  { name: 'Forever', id: { keepWithinSecs: -1 }}
+];
+
+// values correspond to cron days
+const cronDays = [
+  { id: 0, name: 'Sunday' },
+  { id: 1, name: 'Monday' },
+  { id: 2, name: 'Tuesday' },
+  { id: 3, name: 'Wednesday' },
+  { id: 4, name: 'Thursday' },
+  { id: 5, name: 'Friday' },
+  { id: 6, name: 'Saturday' },
+];
+
+// generates 24h time sets (instead of american 12h) to avoid having to translate everything to locales eg. 12:00
+const cronHours = Array.from({ length: 24 }).map(function (v, i) { return { id: i, name: (i < 10 ? '0' : '') + i + ':00' }; });
+
+function prettyBackupSchedule(pattern) {
+  if (!pattern) return '';
+  const tmp = pattern.split(' ');
+  const hours = tmp[2].split(','), days = tmp[5].split(',');
+  let prettyDay;
+  if (days.length === 7 || days[0] === '*') {
+      prettyDay = 'Everyday';
+  } else  {
+      prettyDay = days.map(function (day) { return cronDays[parseInt(day, 10)].name.substr(0, 3); }).join(',');
+  }
+
+  const prettyHour = hours.map(function (hour) { return cronHours[parseInt(hour, 10)].name; }).join(',');
+  return prettyDay + ' at ' + prettyHour;
+};
+
+function prettyBackupRetention(retention) {
+  function stableStringify(obj) { return JSON.stringify(obj, Object.keys(obj).sort()); }
+  const tmp = backupRetentions.find(function (p) { return stableStringify(p.id) === stableStringify(retention); });
+  return tmp ? tmp.name : '';
+}
+
 export default {
   create,
+  backupRetentions,
+  cronDays,
+  cronHours,
+  prettyBackupSchedule,
+  prettyBackupRetention
 };