76 lines
1.7 KiB
Go
76 lines
1.7 KiB
Go
package calendar
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import (
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"bytes"
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"fmt"
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"strings"
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"text/template"
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"time"
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"kumoly.io/kumoly/app/store"
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)
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const ics_base = `BEGIN:VCALENDAR
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PRODID:-//Kumoly//Kumoly App v0.0.1//EN
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VERSION:2.0
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CALSCALE:GREGORIAN
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METHOD:PUBLISH
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X-WR-CALNAME:{{.Name}}
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X-WR-TIMEZONE:Asia/Taipei
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X-WR-CALDESC:{{.Name}}{{/*
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BEGIN:VTIMEZONE
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TZID:{{.Timezone}}
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X-LIC-LOCATION:{{.Timezone}}
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BEGIN:STANDARD
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TZOFFSETFROM:+0800
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TZOFFSETTO:+0800
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TZNAME:CST
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DTSTART:19700101T000000
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END:STANDARD
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END:VTIMEZONE*/}}{{with .Events}}{{ if gt (len .) 0 }}{{ range $event := . }}
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BEGIN:VEVENT
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DTSTART:{{$event.Start|icstime}}
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DTEND:{{$event.End|icstime}}
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DTSTAMP:{{now|icstime}}
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UID:{{$event.ID}}
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CREATED:{{$event.CreatedAt|icstime}}
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DESCRIPTION:{{$event.ID}}
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LAST-MODIFIED:{{$event.UpdatedAt|icstime}}
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LOCATION:{{$event.Location}}
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SEQUENCE:0
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STATUS:CONFIRMED
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SUMMARY:{{$event.Name}}
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TRANSP:TRANSPARENT
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END:VEVENT{{end}}{{end}}{{end}}
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END:VCALENDAR`
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var tmpl *template.Template
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func init() {
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tmpl = template.Must(template.New("").Funcs(template.FuncMap{
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"icstime": icstime,
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"now": func() time.Time { return time.Now() },
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"tadd": func(t time.Time, min int) time.Time { return t.Add(time.Minute * time.Duration(min)) },
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}).Parse(ics_base))
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}
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func ICS(cal_id string, from time.Time, to time.Time) (string, error) {
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cal := &Calendar{}
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store.DB.Preload("Events", `"start" > ? and "end" < ?`, from, to).
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First(cal, "id = ?", cal_id)
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buf := &bytes.Buffer{}
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if err := tmpl.Execute(buf, cal); err != nil {
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return "", err
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}
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return strings.ReplaceAll(buf.String(), "\n", "\r\n"), nil
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}
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func icstime(t time.Time) string {
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return t.UTC().Format("20060102T150405Z")
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}
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func offsetStr(offset int) string {
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return fmt.Sprintf("%+05d", offset/36)
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}
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