vikunja-api/pkg/caldav/caldav.go

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// Vikunja is a todo-list application to facilitate your life.
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// Copyright 2018-2020 Vikunja and contributors. All rights reserved.
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//
// 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.
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//
// 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.
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//
// 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 (
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"code.vikunja.io/api/pkg/models"
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"code.vikunja.io/api/pkg/utils"
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"fmt"
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"strconv"
"time"
)
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// DateFormat ist the caldav date format
const DateFormat = `20060102T150405`
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// Event holds a single caldav event
type Event struct {
Summary string
Description string
UID string
Alarms []Alarm
TimestampUnix int64
StartUnix int64
EndUnix int64
}
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// Todo holds a single VTODO
type Todo struct {
// Required
TimestampUnix int64
UID string
// Optional
Summary string
Description string
CompletedUnix int64
Organizer *models.User
Priority int64 // 0-9, 1 is highest
RelatedToUID string
StartUnix int64
EndUnix int64
DueDateUnix int64
Duration time.Duration
CreatedUnix int64
UpdatedUnix int64 // last-mod
}
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// 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
}
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// ParseTodos returns a caldav vcalendar string with todos
func ParseTodos(config *Config, todos []*Todo) (caldavtodos string) {
caldavtodos = `BEGIN:VCALENDAR
VERSION:2.0
METHOD:PUBLISH
X-PUBLISHED-TTL:PT4H
X-WR-CALNAME:` + config.Name + `
PRODID:-//` + config.ProdID + `//EN`
for _, t := range todos {
if t.UID == "" {
t.UID = makeCalDavTimeFromUnixTime(t.TimestampUnix) + utils.Sha256(t.Summary)
}
caldavtodos += `
BEGIN:VTODO
UID:` + t.UID + `
DTSTAMP:` + makeCalDavTimeFromUnixTime(t.TimestampUnix) + `
SUMMARY:` + t.Summary
if t.StartUnix != 0 {
caldavtodos += `
DTSTART: ` + makeCalDavTimeFromUnixTime(t.StartUnix)
}
if t.EndUnix != 0 {
caldavtodos += `
DTEND: ` + makeCalDavTimeFromUnixTime(t.EndUnix)
}
if t.Description != "" {
caldavtodos += `
DESCRIPTION:` + t.Description
}
if t.CompletedUnix != 0 {
caldavtodos += `
COMPLETED: ` + makeCalDavTimeFromUnixTime(t.CompletedUnix)
}
if t.Organizer != nil {
caldavtodos += `
ORGANIZER;CN=:` + t.Organizer.Username
}
if t.RelatedToUID != "" {
caldavtodos += `
RELATED-TO:` + t.RelatedToUID
}
if t.DueDateUnix != 0 {
caldavtodos += `
DUE:` + makeCalDavTimeFromUnixTime(t.DueDateUnix)
}
if t.CreatedUnix != 0 {
caldavtodos += `
CREATED:` + makeCalDavTimeFromUnixTime(t.CreatedUnix)
}
if t.Duration != 0 {
caldavtodos += `
DURATION:PT` + fmt.Sprintf("%.6f", t.Duration.Hours()) + `H` + fmt.Sprintf("%.6f", t.Duration.Minutes()) + `M` + fmt.Sprintf("%.6f", t.Duration.Seconds()) + `S`
}
if t.Priority != 0 {
caldavtodos += `
PRIORITY:` + strconv.Itoa(int(t.Priority))
}
caldavtodos += `
LAST-MODIFIED:` + makeCalDavTimeFromUnixTime(t.UpdatedUnix)
caldavtodos += `
END:VTODO`
}
caldavtodos += `
END:VCALENDAR` // Need a line break
return
}
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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(DateFormat)
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}
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
}