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package ctlsocksrv
import (
"path/filepath"
"strings"
)
// SanitizePath adapts filepath.Clean for FUSE paths.
// 1. Leading slash(es) are dropped
// 2. It returns "" instead of "."
// 3. If the cleaned path points above CWD (start with ".."), an empty string
// is returned
//
// See the TestSanitizePath testcases for examples.
func SanitizePath(path string) string {
// (1)
for len(path) > 0 && path[0] == '/' {
path = path[1:]
}
if len(path) == 0 {
return ""
}
clean := filepath.Clean(path)
// (2)
if clean == "." {
return ""
}
// (3)
if clean == ".." || strings.HasPrefix(clean, "../") {
return ""
}
return clean
}
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