feat: implement caldav search

vendor/github.com/dolanor/caldav-go/caldav/server.go

@@ -0,0 +1,30 @@
+package caldav
+
+import (
+	"github.com/dolanor/caldav-go/utils"
+	"github.com/dolanor/caldav-go/webdav"
+)
+
+// a server that accepts CalDAV requests
+type Server webdav.Server
+
+// NewServer creates a reference to a CalDAV server.
+// host is the url to access the server, stopping at the port:
+// https://user:password@host:port/
+func NewServer(host string) (*Server, error) {
+	if s, err := webdav.NewServer(host); err != nil {
+		return nil, utils.NewError(NewServer, "unable to create WebDAV server", host, err)
+	} else {
+		return (*Server)(s), nil
+	}
+}
+
+// downcasts the server to the WebDAV interface
+func (s *Server) WebDAV() *webdav.Server {
+	return (*webdav.Server)(s)
+}
+
+// creates a new CalDAV request object
+func (s *Server) NewRequest(method string, path string, icaldata ...interface{}) (*Request, error) {
+	return NewRequest(method, s.WebDAV().Http().AbsUrlStr(path), icaldata...)
+}