vikunja-api/pkg/caldav/caldav.go

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// Vikunja is a todo-list application to facilitate your life.
// Copyright 2018 Vikunja and contributors. All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package caldav
import (
"code.vikunja.io/api/pkg/utils"
"strconv"
"time"
)
// Event holds a single caldav event
type Event struct {
Summary string
Description string
UID string
Alarms []Alarm
TimestampUnix int64
StartUnix int64
EndUnix int64
}
// Alarm holds infos about an alarm from a caldav event
type Alarm struct {
TimeUnix int64
Description string
}
// Config is the caldav calendar config
type Config struct {
Name string
ProdID string
}
// ParseEvents parses an array of caldav events and gives them back as string
func ParseEvents(config *Config, events []*Event) (caldavevents string) {
caldavevents += `BEGIN:VCALENDAR
VERSION:2.0
METHOD:PUBLISH
X-PUBLISHED-TTL:PT4H
X-WR-CALNAME:` + config.Name + `
PRODID:-//` + config.ProdID + `//EN`
for _, e := range events {
if e.UID == "" {
e.UID = makeCalDavTimeFromUnixTime(e.TimestampUnix) + utils.Sha256(e.Summary)
}
caldavevents += `
BEGIN:VEVENT
UID:` + e.UID + `
SUMMARY:` + e.Summary + `
DESCRIPTION:` + e.Description + `
DTSTAMP:` + makeCalDavTimeFromUnixTime(e.TimestampUnix) + `
DTSTART:` + makeCalDavTimeFromUnixTime(e.StartUnix) + `
DTEND:` + makeCalDavTimeFromUnixTime(e.EndUnix)
for _, a := range e.Alarms {
if a.Description == "" {
a.Description = e.Summary
}
caldavevents += `
BEGIN:VALARM
TRIGGER:` + calcAlarmDateFromReminder(e.StartUnix, a.TimeUnix) + `
ACTION:DISPLAY
DESCRIPTION:` + a.Description + `
END:VALARM`
}
caldavevents += `
END:VEVENT`
}
caldavevents += `
END:VCALENDAR` // Need a line break
return
}
func makeCalDavTimeFromUnixTime(unixtime int64) (caldavtime string) {
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tz, _ := time.LoadLocation("UTC")
tm := time.Unix(unixtime, 0).In(tz)
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return tm.Format("20060102T150405")
}
func calcAlarmDateFromReminder(eventStartUnix, reminderUnix int64) (alarmTime string) {
if eventStartUnix > reminderUnix {
alarmTime += `-`
}
alarmTime += `PT`
diff := eventStartUnix - reminderUnix
if diff < 0 { // Make it positive
diff = diff * -1
}
alarmTime += strconv.Itoa(int(diff/60)) + "M"
return
}