photoprism/pkg/clean/hex.go

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package clean
import (
"strings"
)
// Hex removes invalid character from a hex string and makes it lowercase.
func Hex(s string) string {
if s == "" || reject(s, 1024) {
return ""
}
s = strings.ToLower(strings.TrimSpace(s))
// Remove all invalid characters.
s = strings.Map(func(r rune) rune {
if (r < '0' || r > '9') && (r < 'a' || r > 'f') {
return -1
}
return r
}, s)
return s
}