Added hashing of EWS calendar item IDs

src/calanonsync/ews.go

@@ -2,6 +2,8 @@ package main
 
 import (
 	"bytes"
+	"crypto/md5"
+	"encoding/hex"
 	"encoding/xml"
 	"fmt"
 	"io"
@@ -22,6 +24,16 @@ type CalendarItem struct {
 	UID              string
 	Start            time.Time
 	End              time.Time
+	RecurrenceId     string
+	Sensitivity      string
+	CalendarItemType string
+}
+
+func (ci CalendarItem) Hash() string {
+	h := md5.New()
+	h.Write([]byte(ci.UID))
+	h.Write([]byte(ci.RecurrenceId))
+	return strings.ToUpper(hex.EncodeToString(h.Sum(nil)))
 }
 
 type EWSCalendar struct {