forked from aksdb/CalAnonSync
204 lines
3.9 KiB
Go
204 lines
3.9 KiB
Go
package main
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import (
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"bufio"
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"encoding/xml"
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"errors"
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"io"
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"log"
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"net/http"
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"strings"
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"text/template"
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"time"
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)
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const ICAL_TIME = "20060102T150405"
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const ICAL_DATE = "20060102"
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type CalDAV struct {
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ServerSettings
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httpClient *http.Client
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}
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type ICal struct {
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data []string
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eventData []string // sub slice
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}
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func (i ICal) Summary() string {
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for _, s := range i.eventData {
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if strings.HasPrefix(s, "SUMMARY:") {
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return s[len("SUMMARY:"):]
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}
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}
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return ""
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}
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func (i ICal) UID() string {
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for _, s := range i.eventData {
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if strings.HasPrefix(s, "UID:") {
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return s[len("UID:"):]
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}
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}
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return ""
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}
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func (i ICal) getTimeField(f string) time.Time {
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for _, s := range i.eventData {
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if strings.HasPrefix(s, f) {
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st := s[strings.LastIndex(s, ":")+1:]
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// BEWARE, we don't parse possible ICal timezones (yet). If it is not
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// a UTC time, we simply assume local time.
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zone := time.Local
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if st[len(st)-1:] == "Z" {
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st = st[:len(st)-1]
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zone = time.UTC
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}
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t, err := time.ParseInLocation(ICAL_TIME, st, zone)
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if err != nil {
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log.Printf("Cannot decode %s '%s': %s", f, st, err)
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}
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return t
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}
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}
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return time.Time{}
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}
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func (i ICal) Start() time.Time {
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return i.getTimeField("DTSTART")
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}
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func (i ICal) End() time.Time {
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return i.getTimeField("DTEND")
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}
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func (i *ICal) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
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s := ""
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err := d.DecodeElement(&s, &start)
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if err != nil {
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return err
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}
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ical, err := ParseICal(strings.NewReader(s))
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if err != nil {
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return err
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}
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*i = *ical
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return nil
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}
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func (i ICal) String() string {
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sb := &strings.Builder{}
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for n, line := range i.data {
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if n > 0 {
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sb.WriteRune('\n')
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}
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sb.WriteString(line)
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}
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return sb.String()
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}
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func ParseICal(r io.Reader) (*ICal, error) {
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var data []string
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scanner := bufio.NewScanner(r)
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eventStart := -1
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eventEnd := -1
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i := 0
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for scanner.Scan() {
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line := scanner.Text()
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data = append(data, line)
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if eventStart == -1 && line == "BEGIN:VEVENT" {
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eventStart = i
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}
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if eventEnd == -1 && line == "END:VEVENT" {
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eventEnd = i
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}
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i++
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}
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err := scanner.Err()
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if err != nil {
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return nil, err
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}
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// If we didn't find a start or an end, abort.
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if eventStart < 0 || eventEnd <= eventStart {
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return nil, errors.New("calendar item without event")
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}
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return &ICal{
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data: data,
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eventData: data[eventStart+1 : eventEnd],
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}, err
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}
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func NewCalDAV(settings ServerSettings) *CalDAV {
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return &CalDAV{
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httpClient: http.DefaultClient,
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ServerSettings: settings,
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}
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}
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type CalDAVItem struct {
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HRef string
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ICal
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}
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func (c *CalDAV) GetEvents() ([]CalDAVItem, error) {
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req, err := http.NewRequest("PROPFIND", c.URL, strings.NewReader(`<propfind xmlns='DAV:'><prop><calendar-data xmlns='urn:ietf:params:xml:ns:caldav'/></prop></propfind>`))
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if err != nil {
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return nil, err
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}
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req.Header.Set("Content-Type", "text/xml")
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req.SetBasicAuth(c.Username, c.Password)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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ms := &MultiStatus{}
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err = xml.NewDecoder(resp.Body).Decode(ms)
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if err != nil {
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return nil, err
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}
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result := make([]CalDAVItem, 0, len(ms.Response))
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for _, p := range ms.Response {
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item := CalDAVItem{p.HRef, p.PropStat.Prop.CalendarData}
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result = append(result, item)
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}
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return result, nil
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}
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type MultiStatus struct {
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Response []PropFindResponse `xml:"response"`
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}
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type PropFindResponse struct {
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HRef string `xml:"href"`
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PropStat struct {
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Prop struct {
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CalendarData ICal `xml:"calendar-data"`
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} `xml:"prop"`
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} `xml:"propstat"`
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}
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var icalTemplate = template.Must(template.New("icalTemplate").Parse(`BEGIN:VCALENDAR
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PRODID:-//aksdb/calanonsync//EN
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VERSION:2.0
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BEGIN:VEVENT
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UID:{{ .UID }}
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SUMMARY:{{ .Summary }}
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CLASS:PUBLIC
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DTSTART:{{ .Start }}Z
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DTEND:{{ .End }}Z
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CREATED:{{ .Now }}Z
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DTSTAMP:{{ .Now }}Z
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LAST-MODIFIED:{{ .Now }}Z
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END:VEVENT
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END:VCALENDAR`))
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