// Copyright (C) 2019 Marius Schellenberger

package authdav

import (
	"errors"
	"path/filepath"
	"strings"
)

type Matcher func(path string) bool

type Filter interface {
	Filter(path string) error
}

var ErrMacOSFilter = errors.New("authdav: MacOS filter: access denied")

type MacOSFilter struct {
	match []Matcher
}

func NewMacOSFilter() *MacOSFilter {
	return &MacOSFilter{
		match: []Matcher{
			func(p string) {
				return p == ".DS_Store"
			},
			func(p string) {
				return strings.HasPrefix(p, "._")
			},
		},
	}
}

func (f *MacOSFilter) Filter(path string) error {
	_, f := filepath.Split(path)
	for _, m := range f.match {
		if m(f) {
			return ErrMacOSFilter
		}
	}
	return nil
}