feat: implement caldav search

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

@@ -0,0 +1,28 @@
+package webdav
+
+import (
+	"github.com/dolanor/caldav-go/http"
+	"github.com/dolanor/caldav-go/utils"
+)
+
+// a server that accepts WebDAV requests
+type Server http.Server
+
+// creates a reference to an WebDAV server
+func NewServer(baseUrlStr string) (*Server, error) {
+	if s, err := http.NewServer(baseUrlStr); err != nil {
+		return nil, utils.NewError(NewServer, "unable to create WebDAV server", baseUrlStr, err)
+	} else {
+		return (*Server)(s), nil
+	}
+}
+
+// downcasts the server to the local HTTP interface
+func (s *Server) Http() *http.Server {
+	return (*http.Server)(s)
+}
+
+// creates a new WebDAV request object
+func (s *Server) NewRequest(method string, path string, xmldata ...interface{}) (*Request, error) {
+	return NewRequest(method, s.Http().AbsUrlStr(path), xmldata...)
+}