forked from hswaw/hscloud
130 lines
3.7 KiB
Go
130 lines
3.7 KiB
Go
package calendar
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import (
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"context"
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"fmt"
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"io"
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"net/http"
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"sort"
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"strings"
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"time"
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_ "time/tzdata"
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ics "github.com/arran4/golang-ical"
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"github.com/golang/glog"
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)
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const (
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// EventsURL is the calendar from which we load public Hackerspace events.
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EventsURL = "https://owncloud.hackerspace.pl/remote.php/dav/public-calendars/g8toktZrA9fyAHNi/?export"
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)
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// eventsBySooner sorts upcoming events so the one that happens the soonest
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// will be first in the list.
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type eventBySooner []*UpcomingEvent
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func (e eventBySooner) Len() int { return len(e) }
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func (e eventBySooner) Swap(i, j int) { e[i], e[j] = e[j], e[i] }
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func (e eventBySooner) Less(i, j int) bool {
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a, b := e[i], e[j]
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if a.Start.Time == b.Start.Time {
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if a.End.Time == b.End.Time {
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return a.UID < b.UID
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}
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return a.End.Time.Before(b.End.Time)
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}
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return a.Start.Time.Before(b.Start.Time)
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}
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// parseUpcomingEvents generates a list of upcoming events from an open ICS/iCal file.
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func parseUpcomingEvents(now time.Time, data io.Reader) ([]*UpcomingEvent, error) {
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cal, err := ics.ParseCalendar(data)
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if err != nil {
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return nil, fmt.Errorf("ParseCalendar(%q): %w", err)
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}
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var out []*UpcomingEvent
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for _, event := range cal.Events() {
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uidProp := event.GetProperty(ics.ComponentPropertyUniqueId)
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if uidProp == nil || uidProp.Value == "" {
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glog.Errorf("Event with no UID, ignoring: %+v", event)
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continue
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}
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uid := uidProp.Value
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summaryProp := event.GetProperty(ics.ComponentPropertySummary)
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if summaryProp == nil || summaryProp.Value == "" {
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glog.Errorf("Event %s has no summary, ignoring", uid)
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}
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summary := summaryProp.Value
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var description string
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descriptionProp := event.GetProperty(ics.ComponentPropertyDescription)
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if descriptionProp != nil && descriptionProp.Value != "" {
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// The ICS/iCal description has escaped newlines. Undo that.
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description = strings.ReplaceAll(descriptionProp.Value, `\n`, "\n")
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}
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status := event.GetProperty(ics.ComponentPropertyStatus)
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tentative := false
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if status != nil {
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if status.Value == string(ics.ObjectStatusCancelled) {
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// NextCloud only has CONFIRMED, CANCELELD and TENTATIVE for
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// events. We drop everything CANCELELD and keep things that are
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// TENTATIVE.
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continue
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}
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if status.Value == string(ics.ObjectStatusTentative) {
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tentative = true
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}
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}
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start, err := parseICSTime(event.GetProperty(ics.ComponentPropertyDtStart))
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if err != nil {
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glog.Errorf("Event %s has unparseable DTSTART, ignoring: %v", uid, err)
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continue
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}
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end, err := parseICSTime(event.GetProperty(ics.ComponentPropertyDtEnd))
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if err != nil {
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glog.Errorf("Event %s has unparseable DTEND, ignoring: %v", uid, err)
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continue
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}
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if (start.WholeDay && !end.WholeDay) || (!start.WholeDay && end.WholeDay) {
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glog.Errorf("Event %s has whole-day inconsistencies, start: %s, end: %s, ignoring", uid, start, end)
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}
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u := &UpcomingEvent{
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UID: uid,
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Summary: summary,
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Description: description,
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Start: start,
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End: end,
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Tentative: tentative,
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}
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if u.Elapsed(now) {
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continue
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}
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out = append(out, u)
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}
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sort.Sort(eventBySooner(out))
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return out, nil
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}
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// GetUpcomingEvents returns all public Hackerspace events that are upcoming
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// relative to the given time 'now' as per the Warsaw Hackerspace public
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// calender (from owncloud.hackerspace.pl).
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func GetUpcomingEvents(ctx context.Context, now time.Time) ([]*UpcomingEvent, error) {
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r, err := http.NewRequestWithContext(ctx, "GET", EventsURL, nil)
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if err != nil {
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return nil, fmt.Errorf("NewRequest(%q): %w", EventsURL, err)
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}
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res, err := http.DefaultClient.Do(r)
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if err != nil {
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return nil, fmt.Errorf("Do(%q): %w", EventsURL, err)
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}
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defer res.Body.Close()
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return parseUpcomingEvents(now, res.Body)
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}
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