photoprism/pkg/rnd/validation.go

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package rnd
import "strings"
// IsUnique checks if the string is a valid unique ID.
func IsUnique(s string, prefix byte) bool {
if IsUUID(s) {
// Standard UUID.
return true
}
return IsUID(s, prefix)
}
// IsUID checks if the string is a valid entity UID.
func IsUID(s string, prefix byte) bool {
if len(s) != 16 {
return false
}
if !IsAlnum(s) {
return false
}
return prefix == 0 || s[0] == prefix
}
// InvalidUID checks if the UID is empty or invalid.
func InvalidUID(s string, prefix byte) bool {
return !IsUID(s, prefix)
}
// IsUUID tests if the string looks like a standard UUID.
func IsUUID(s string) bool {
return len(s) == 36 && IsHex(s)
}
// SanitizeUUID normalizes UUIDs found in XMP or Exif metadata.
func SanitizeUUID(s string) string {
if s == "" {
return ""
}
s = strings.Replace(strings.TrimSpace(s), "\"", "", -1)
if start := strings.LastIndex(s, ":"); start != -1 {
s = s[start+1:]
}
if !IsUUID(s) {
return ""
}
return strings.ToLower(s)
}
// IsAlnum returns true if the string only contains alphanumeric ascii chars without whitespace.
func IsAlnum(s string) bool {
if s == "" {
return false
}
for _, r := range s {
if (r < '0' || r > '9') && (r < 'A' || r > 'Z') && (r < 'a' || r > 'z') {
return false
}
}
return true
}
// IsHex returns true if the string only contains hex numbers, dashes and letters without whitespace.
func IsHex(s string) bool {
if s == "" {
return false
}
for _, r := range s {
if (r < 48 || r > 57) && (r < 97 || r > 102) && (r < 65 || r > 70) && r != 45 {
return false
}
}
return true
}