feat: v2 (#599)

Read https://github.com/filebrowser/filebrowser/pull/575.

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Former-commit-id: e032e0804dd051df86f42962de2b39caec5318b7

rules/rules.go

@@ -0,0 +1,44 @@
+package rules
+
+import (
+	"regexp"
+	"strings"
+)
+
+// Checker is a Rules checker.
+type Checker interface {
+	Check(path string) bool
+}
+
+// Rule is a allow/disallow rule.
+type Rule struct {
+	Regex  bool    `json:"regex"`
+	Allow  bool    `json:"allow"`
+	Path   string  `json:"path"`
+	Regexp *Regexp `json:"regexp"`
+}
+
+// Matches matches a path against a rule.
+func (r *Rule) Matches(path string) bool {
+	if r.Regex {
+		return r.Regexp.MatchString(path)
+	}
+
+	return strings.HasPrefix(path, r.Path)
+}
+
+// Regexp is a wrapper to the native regexp type where we
+// save the raw expression.
+type Regexp struct {
+	Raw    string `json:"raw"`
+	regexp *regexp.Regexp
+}
+
+// MatchString checks if a string matches the regexp.
+func (r *Regexp) MatchString(s string) bool {
+	if r.regexp == nil {
+		r.regexp = regexp.MustCompile(r.Raw)
+	}
+
+	return r.regexp.MatchString(s)
+}