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generator.go
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generator.go
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package ics
import (
"bytes"
"encoding/hex"
"strconv"
"strings"
"text/template"
"time"
)
func Generate(prodId string, events ...*Event) (string, error) {
obj := &generator{
ProdId: prodId,
Events: []string{},
}
eventTmpl, err := template.New("events").Parse(vevent)
if err != nil {
return "", err
}
for _, event := range events {
for idx := range event.Attendees {
if event.Attendees[idx].Rsvp == "" {
event.Attendees[idx].Rsvp = Rsvp_False
}
}
e := &vEvent{
Event: event,
DtStamp: FormatDateTime(time.Now()),
DtEnd: FormatDateTime(event.DtEnd),
DtStart: FormatDateTime(event.DtStart),
ExDate: make([]string, len(event.ExDate)),
Description: strings.Join(strings.Split(event.Description, "\n"), `\n`),
}
for i, exd := range event.ExDate {
e.ExDate[i] = FormatDateTime(exd)
}
event.dtStamp = e.DtStamp
event.UID = hex.EncodeToString([]byte(e.UID))
buf := &bytes.Buffer{}
if err := eventTmpl.Execute(buf, e); err != nil {
return "", err
}
obj.Events = append(obj.Events, buf.String())
}
buf := &bytes.Buffer{}
icsTmpl, err := template.New("ics").Parse(ics)
if err != nil {
return "", err
}
if err := icsTmpl.Execute(buf, obj); err != nil {
return "", err
}
return buf.String(), nil
}
func (event *Event) Generate(prodId string) (string, error) {
obj := &generator{
ProdId: prodId,
Events: []string{},
}
for idx := range event.Attendees {
if event.Attendees[idx].Rsvp == "" {
event.Attendees[idx].Rsvp = Rsvp_False
}
}
e := &vEvent{
Event: event,
DtStamp: FormatDateTime(time.Now()),
DtEnd: FormatDateTime(event.DtEnd),
DtStart: FormatDateTime(event.DtStart),
ExDate: make([]string, len(event.ExDate)),
Description: strings.Join(strings.Split(event.Description, "\n"), `\n`),
}
for i, exd := range event.ExDate {
e.ExDate[i] = FormatDateTime(exd)
}
event.dtStamp = e.DtStamp
event.UID = hex.EncodeToString([]byte(e.UID))
eventTmpl, err := template.New("events").Parse(vevent)
if err != nil {
return "", err
}
buf := &bytes.Buffer{}
if err := eventTmpl.Execute(buf, e); err != nil {
return "", err
}
obj.Events = append(obj.Events, buf.String())
buf = &bytes.Buffer{}
icsTmpl, err := template.New("ics").Parse(ics)
if err != nil {
return "", err
}
if err := icsTmpl.Execute(buf, obj); err != nil {
return "", err
}
return buf.String(), nil
}
type generator struct {
ProdId string
Events []string
}
func FormatDateTime(t time.Time) string {
dt := strconv.Itoa(t.Year())
month := strconv.Itoa(int(t.Month()))
if len(month) < 2 {
dt += "0"
}
dt += month
day := strconv.Itoa(t.Day())
if len(day) < 2 {
dt += "0"
}
dt += day + "T"
hour := strconv.Itoa(t.Hour())
if len(hour) < 2 {
dt += "0"
}
dt += hour
min := strconv.Itoa(t.Minute())
if len(min) < 2 {
dt += "0"
}
dt += min
sec := strconv.Itoa(t.Second())
if len(sec) < 2 {
dt += "0"
}
dt += sec + "Z"
return dt
}