Serge Bazanski | 8ef457f | 2021-07-11 14:42:38 +0000 | [diff] [blame] | 1 | package calendar |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "time" |
| 6 | |
| 7 | ics "github.com/arran4/golang-ical" |
| 8 | ) |
| 9 | |
| 10 | // EventTime is a timestamp for calendar events. It either represents a real |
| 11 | // point-in time or a calender day, if it's a whole-day event. |
| 12 | type EventTime struct { |
| 13 | // Time is a timestamp in the timezone originally defined for this event if |
| 14 | // WholeDay is true. Otherwise, it's a UTC time from which a year, month |
| 15 | // and day can be extracted and treated as the indication of a 'calendar |
| 16 | // day' in an unknown timezone. |
| 17 | Time time.Time |
| 18 | // WholeDay is true if this EventTime represents an entire calendar day. |
| 19 | WholeDay bool |
| 20 | } |
| 21 | |
| 22 | func (e *EventTime) String() string { |
| 23 | if e.WholeDay { |
| 24 | return fmt.Sprintf("%s (whole day)", e.Time.Format("2006/01/02")) |
| 25 | } else { |
| 26 | return e.Time.String() |
| 27 | } |
| 28 | } |
| 29 | |
| 30 | // parseICSTime attempts to parse a given ICS DT{START,END} object into an |
| 31 | // EventTime, trying to figure out if the given object represents a timestamp |
| 32 | // or a whole-day event. |
| 33 | func parseICSTime(p *ics.IANAProperty) (*EventTime, error) { |
| 34 | // If this is has a VALUE of DATE, then this is a whole-day time. |
| 35 | // Otherwise, it's an actual timestamp. |
| 36 | valueList, ok := p.ICalParameters[string(ics.ParameterValue)] |
| 37 | if ok { |
| 38 | if len(valueList) != 1 || valueList[0] != "DATE" { |
| 39 | return nil, fmt.Errorf("unsupported time type: %v", valueList) |
| 40 | } |
| 41 | ts, err := time.Parse("20060102", p.Value) |
| 42 | if err != nil { |
| 43 | return nil, fmt.Errorf("could not parse date %q: %w", p.Value, err) |
| 44 | } |
| 45 | return &EventTime{ |
| 46 | Time: ts, |
| 47 | WholeDay: true, |
| 48 | }, nil |
| 49 | } |
| 50 | // You would expect that nextcloud would emit VALUE == DATE-TIME for |
| 51 | // timestamps, but that just doesn't seem to be the case. Maye I should |
| 52 | // read the ICS standard... |
| 53 | |
| 54 | tzidList, ok := p.ICalParameters[string(ics.ParameterTzid)] |
| 55 | if !ok || len(tzidList) != 1 { |
| 56 | return nil, fmt.Errorf("TZID missing") |
| 57 | } |
| 58 | tzid := tzidList[0] |
| 59 | location, err := time.LoadLocation(tzid) |
| 60 | if err != nil { |
| 61 | return nil, fmt.Errorf("could not parse TZID %q: %w", tzid, err) |
| 62 | } |
| 63 | |
| 64 | ts, err := time.ParseInLocation("20060102T150405", p.Value, location) |
| 65 | if err != nil { |
| 66 | return nil, fmt.Errorf("could not parse time %q: %w", p.Value, err) |
| 67 | } |
| 68 | |
| 69 | return &EventTime{ |
| 70 | Time: ts, |
| 71 | WholeDay: false, |
| 72 | }, nil |
| 73 | } |